Update vendor

vendor/github.com/labstack/echo/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2017 LabStack
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/github.com/labstack/echo/bind.go

@@ -0,0 +1,259 @@
+package echo
+
+import (
+	"encoding/json"
+	"encoding/xml"
+	"errors"
+	"fmt"
+	"net/http"
+	"reflect"
+	"strconv"
+	"strings"
+)
+
+type (
+	// Binder is the interface that wraps the Bind method.
+	Binder interface {
+		Bind(i interface{}, c Context) error
+	}
+
+	// DefaultBinder is the default implementation of the Binder interface.
+	DefaultBinder struct{}
+
+	// BindUnmarshaler is the interface used to wrap the UnmarshalParam method.
+	BindUnmarshaler interface {
+		// UnmarshalParam decodes and assigns a value from an form or query param.
+		UnmarshalParam(param string) error
+	}
+)
+
+// Bind implements the `Binder#Bind` function.
+func (b *DefaultBinder) Bind(i interface{}, c Context) (err error) {
+	req := c.Request()
+	if req.Method == GET {
+		if err = b.bindData(i, c.QueryParams(), "query"); err != nil {
+			return NewHTTPError(http.StatusBadRequest, err.Error())
+		}
+		return
+	}
+	ctype := req.Header.Get(HeaderContentType)
+	if req.ContentLength == 0 {
+		return NewHTTPError(http.StatusBadRequest, "Request body can't be empty")
+	}
+	switch {
+	case strings.HasPrefix(ctype, MIMEApplicationJSON):
+		if err = json.NewDecoder(req.Body).Decode(i); err != nil {
+			if ute, ok := err.(*json.UnmarshalTypeError); ok {
+				return NewHTTPError(http.StatusBadRequest, fmt.Sprintf("Unmarshal type error: expected=%v, got=%v, offset=%v", ute.Type, ute.Value, ute.Offset))
+			} else if se, ok := err.(*json.SyntaxError); ok {
+				return NewHTTPError(http.StatusBadRequest, fmt.Sprintf("Syntax error: offset=%v, error=%v", se.Offset, se.Error()))
+			} else {
+				return NewHTTPError(http.StatusBadRequest, err.Error())
+			}
+		}
+	case strings.HasPrefix(ctype, MIMEApplicationXML):
+		if err = xml.NewDecoder(req.Body).Decode(i); err != nil {
+			if ute, ok := err.(*xml.UnsupportedTypeError); ok {
+				return NewHTTPError(http.StatusBadRequest, fmt.Sprintf("Unsupported type error: type=%v, error=%v", ute.Type, ute.Error()))
+			} else if se, ok := err.(*xml.SyntaxError); ok {
+				return NewHTTPError(http.StatusBadRequest, fmt.Sprintf("Syntax error: line=%v, error=%v", se.Line, se.Error()))
+			} else {
+				return NewHTTPError(http.StatusBadRequest, err.Error())
+			}
+		}
+	case strings.HasPrefix(ctype, MIMEApplicationForm), strings.HasPrefix(ctype, MIMEMultipartForm):
+		params, err := c.FormParams()
+		if err != nil {
+			return NewHTTPError(http.StatusBadRequest, err.Error())
+		}
+		if err = b.bindData(i, params, "form"); err != nil {
+			return NewHTTPError(http.StatusBadRequest, err.Error())
+		}
+	default:
+		return ErrUnsupportedMediaType
+	}
+	return
+}
+
+func (b *DefaultBinder) bindData(ptr interface{}, data map[string][]string, tag string) error {
+	typ := reflect.TypeOf(ptr).Elem()
+	val := reflect.ValueOf(ptr).Elem()
+
+	if typ.Kind() != reflect.Struct {
+		return errors.New("Binding element must be a struct")
+	}
+
+	for i := 0; i < typ.NumField(); i++ {
+		typeField := typ.Field(i)
+		structField := val.Field(i)
+		if !structField.CanSet() {
+			continue
+		}
+		structFieldKind := structField.Kind()
+		inputFieldName := typeField.Tag.Get(tag)
+
+		if inputFieldName == "" {
+			inputFieldName = typeField.Name
+			// If tag is nil, we inspect if the field is a struct.
+			if _, ok := bindUnmarshaler(structField); !ok && structFieldKind == reflect.Struct {
+				err := b.bindData(structField.Addr().Interface(), data, tag)
+				if err != nil {
+					return err
+				}
+				continue
+			}
+		}
+		inputValue, exists := data[inputFieldName]
+		if !exists {
+			continue
+		}
+
+		// Call this first, in case we're dealing with an alias to an array type
+		if ok, err := unmarshalField(typeField.Type.Kind(), inputValue[0], structField); ok {
+			if err != nil {
+				return err
+			}
+			continue
+		}
+
+		numElems := len(inputValue)
+		if structFieldKind == reflect.Slice && numElems > 0 {
+			sliceOf := structField.Type().Elem().Kind()
+			slice := reflect.MakeSlice(structField.Type(), numElems, numElems)
+			for j := 0; j < numElems; j++ {
+				if err := setWithProperType(sliceOf, inputValue[j], slice.Index(j)); err != nil {
+					return err
+				}
+			}
+			val.Field(i).Set(slice)
+		} else {
+			if err := setWithProperType(typeField.Type.Kind(), inputValue[0], structField); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+func setWithProperType(valueKind reflect.Kind, val string, structField reflect.Value) error {
+	// But also call it here, in case we're dealing with an array of BindUnmarshalers
+	if ok, err := unmarshalField(valueKind, val, structField); ok {
+		return err
+	}
+
+	switch valueKind {
+	case reflect.Int:
+		return setIntField(val, 0, structField)
+	case reflect.Int8:
+		return setIntField(val, 8, structField)
+	case reflect.Int16:
+		return setIntField(val, 16, structField)
+	case reflect.Int32:
+		return setIntField(val, 32, structField)
+	case reflect.Int64:
+		return setIntField(val, 64, structField)
+	case reflect.Uint:
+		return setUintField(val, 0, structField)
+	case reflect.Uint8:
+		return setUintField(val, 8, structField)
+	case reflect.Uint16:
+		return setUintField(val, 16, structField)
+	case reflect.Uint32:
+		return setUintField(val, 32, structField)
+	case reflect.Uint64:
+		return setUintField(val, 64, structField)
+	case reflect.Bool:
+		return setBoolField(val, structField)
+	case reflect.Float32:
+		return setFloatField(val, 32, structField)
+	case reflect.Float64:
+		return setFloatField(val, 64, structField)
+	case reflect.String:
+		structField.SetString(val)
+	default:
+		return errors.New("unknown type")
+	}
+	return nil
+}
+
+func unmarshalField(valueKind reflect.Kind, val string, field reflect.Value) (bool, error) {
+	switch valueKind {
+	case reflect.Ptr:
+		return unmarshalFieldPtr(val, field)
+	default:
+		return unmarshalFieldNonPtr(val, field)
+	}
+}
+
+// bindUnmarshaler attempts to unmarshal a reflect.Value into a BindUnmarshaler
+func bindUnmarshaler(field reflect.Value) (BindUnmarshaler, bool) {
+	ptr := reflect.New(field.Type())
+	if ptr.CanInterface() {
+		iface := ptr.Interface()
+		if unmarshaler, ok := iface.(BindUnmarshaler); ok {
+			return unmarshaler, ok
+		}
+	}
+	return nil, false
+}
+
+func unmarshalFieldNonPtr(value string, field reflect.Value) (bool, error) {
+	if unmarshaler, ok := bindUnmarshaler(field); ok {
+		err := unmarshaler.UnmarshalParam(value)
+		field.Set(reflect.ValueOf(unmarshaler).Elem())
+		return true, err
+	}
+	return false, nil
+}
+
+func unmarshalFieldPtr(value string, field reflect.Value) (bool, error) {
+	if field.IsNil() {
+		// Initialize the pointer to a nil value
+		field.Set(reflect.New(field.Type().Elem()))
+	}
+	return unmarshalFieldNonPtr(value, field.Elem())
+}
+
+func setIntField(value string, bitSize int, field reflect.Value) error {
+	if value == "" {
+		value = "0"
+	}
+	intVal, err := strconv.ParseInt(value, 10, bitSize)
+	if err == nil {
+		field.SetInt(intVal)
+	}
+	return err
+}
+
+func setUintField(value string, bitSize int, field reflect.Value) error {
+	if value == "" {
+		value = "0"
+	}
+	uintVal, err := strconv.ParseUint(value, 10, bitSize)
+	if err == nil {
+		field.SetUint(uintVal)
+	}
+	return err
+}
+
+func setBoolField(value string, field reflect.Value) error {
+	if value == "" {
+		value = "false"
+	}
+	boolVal, err := strconv.ParseBool(value)
+	if err == nil {
+		field.SetBool(boolVal)
+	}
+	return err
+}
+
+func setFloatField(value string, bitSize int, field reflect.Value) error {
+	if value == "" {
+		value = "0.0"
+	}
+	floatVal, err := strconv.ParseFloat(value, bitSize)
+	if err == nil {
+		field.SetFloat(floatVal)
+	}
+	return err
+}

vendor/github.com/labstack/echo/context.go

@@ -0,0 +1,551 @@
+package echo
+
+import (
+	"bytes"
+	"encoding/json"
+	"encoding/xml"
+	"fmt"
+	"io"
+	"mime/multipart"
+	"net"
+	"net/http"
+	"net/url"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+type (
+	// Context represents the context of the current HTTP request. It holds request and
+	// response objects, path, path parameters, data and registered handler.
+	Context interface {
+		// Request returns `*http.Request`.
+		Request() *http.Request
+
+		// SetRequest sets `*http.Request`.
+		SetRequest(r *http.Request)
+
+		// Response returns `*Response`.
+		Response() *Response
+
+		// IsTLS returns true if HTTP connection is TLS otherwise false.
+		IsTLS() bool
+
+		// Scheme returns the HTTP protocol scheme, `http` or `https`.
+		Scheme() string
+
+		// RealIP returns the client's network address based on `X-Forwarded-For`
+		// or `X-Real-IP` request header.
+		RealIP() string
+
+		// Path returns the registered path for the handler.
+		Path() string
+
+		// SetPath sets the registered path for the handler.
+		SetPath(p string)
+
+		// Param returns path parameter by name.
+		Param(name string) string
+
+		// ParamNames returns path parameter names.
+		ParamNames() []string
+
+		// SetParamNames sets path parameter names.
+		SetParamNames(names ...string)
+
+		// ParamValues returns path parameter values.
+		ParamValues() []string
+
+		// SetParamValues sets path parameter values.
+		SetParamValues(values ...string)
+
+		// QueryParam returns the query param for the provided name.
+		QueryParam(name string) string
+
+		// QueryParams returns the query parameters as `url.Values`.
+		QueryParams() url.Values
+
+		// QueryString returns the URL query string.
+		QueryString() string
+
+		// FormValue returns the form field value for the provided name.
+		FormValue(name string) string
+
+		// FormParams returns the form parameters as `url.Values`.
+		FormParams() (url.Values, error)
+
+		// FormFile returns the multipart form file for the provided name.
+		FormFile(name string) (*multipart.FileHeader, error)
+
+		// MultipartForm returns the multipart form.
+		MultipartForm() (*multipart.Form, error)
+
+		// Cookie returns the named cookie provided in the request.
+		Cookie(name string) (*http.Cookie, error)
+
+		// SetCookie adds a `Set-Cookie` header in HTTP response.
+		SetCookie(cookie *http.Cookie)
+
+		// Cookies returns the HTTP cookies sent with the request.
+		Cookies() []*http.Cookie
+
+		// Get retrieves data from the context.
+		Get(key string) interface{}
+
+		// Set saves data in the context.
+		Set(key string, val interface{})
+
+		// Bind binds the request body into provided type `i`. The default binder
+		// does it based on Content-Type header.
+		Bind(i interface{}) error
+
+		// Validate validates provided `i`. It is usually called after `Context#Bind()`.
+		// Validator must be registered using `Echo#Validator`.
+		Validate(i interface{}) error
+
+		// Render renders a template with data and sends a text/html response with status
+		// code. Renderer must be registered using `Echo.Renderer`.
+		Render(code int, name string, data interface{}) error
+
+		// HTML sends an HTTP response with status code.
+		HTML(code int, html string) error
+
+		// HTMLBlob sends an HTTP blob response with status code.
+		HTMLBlob(code int, b []byte) error
+
+		// String sends a string response with status code.
+		String(code int, s string) error
+
+		// JSON sends a JSON response with status code.
+		JSON(code int, i interface{}) error
+
+		// JSONPretty sends a pretty-print JSON with status code.
+		JSONPretty(code int, i interface{}, indent string) error
+
+		// JSONBlob sends a JSON blob response with status code.
+		JSONBlob(code int, b []byte) error
+
+		// JSONP sends a JSONP response with status code. It uses `callback` to construct
+		// the JSONP payload.
+		JSONP(code int, callback string, i interface{}) error
+
+		// JSONPBlob sends a JSONP blob response with status code. It uses `callback`
+		// to construct the JSONP payload.
+		JSONPBlob(code int, callback string, b []byte) error
+
+		// XML sends an XML response with status code.
+		XML(code int, i interface{}) error
+
+		// XMLPretty sends a pretty-print XML with status code.
+		XMLPretty(code int, i interface{}, indent string) error
+
+		// XMLBlob sends an XML blob response with status code.
+		XMLBlob(code int, b []byte) error
+
+		// Blob sends a blob response with status code and content type.
+		Blob(code int, contentType string, b []byte) error
+
+		// Stream sends a streaming response with status code and content type.
+		Stream(code int, contentType string, r io.Reader) error
+
+		// File sends a response with the content of the file.
+		File(file string) error
+
+		// Attachment sends a response as attachment, prompting client to save the
+		// file.
+		Attachment(file string, name string) error
+
+		// Inline sends a response as inline, opening the file in the browser.
+		Inline(file string, name string) error
+
+		// NoContent sends a response with no body and a status code.
+		NoContent(code int) error
+
+		// Redirect redirects the request to a provided URL with status code.
+		Redirect(code int, url string) error
+
+		// Error invokes the registered HTTP error handler. Generally used by middleware.
+		Error(err error)
+
+		// Handler returns the matched handler by router.
+		Handler() HandlerFunc
+
+		// SetHandler sets the matched handler by router.
+		SetHandler(h HandlerFunc)
+
+		// Logger returns the `Logger` instance.
+		Logger() Logger
+
+		// Echo returns the `Echo` instance.
+		Echo() *Echo
+
+		// Reset resets the context after request completes. It must be called along
+		// with `Echo#AcquireContext()` and `Echo#ReleaseContext()`.
+		// See `Echo#ServeHTTP()`
+		Reset(r *http.Request, w http.ResponseWriter)
+	}
+
+	context struct {
+		request  *http.Request
+		response *Response
+		path     string
+		pnames   []string
+		pvalues  []string
+		query    url.Values
+		handler  HandlerFunc
+		store    Map
+		echo     *Echo
+	}
+)
+
+const (
+	defaultMemory = 32 << 20 // 32 MB
+	indexPage     = "index.html"
+)
+
+func (c *context) Request() *http.Request {
+	return c.request
+}
+
+func (c *context) SetRequest(r *http.Request) {
+	c.request = r
+}
+
+func (c *context) Response() *Response {
+	return c.response
+}
+
+func (c *context) IsTLS() bool {
+	return c.request.TLS != nil
+}
+
+func (c *context) Scheme() string {
+	// Can't use `r.Request.URL.Scheme`
+	// See: https://groups.google.com/forum/#!topic/golang-nuts/pMUkBlQBDF0
+	if c.IsTLS() {
+		return "https"
+	}
+	return "http"
+}
+
+func (c *context) RealIP() string {
+	ra := c.request.RemoteAddr
+	if ip := c.request.Header.Get(HeaderXForwardedFor); ip != "" {
+		ra = ip
+	} else if ip := c.request.Header.Get(HeaderXRealIP); ip != "" {
+		ra = ip
+	} else {
+		ra, _, _ = net.SplitHostPort(ra)
+	}
+	return ra
+}
+
+func (c *context) Path() string {
+	return c.path
+}
+
+func (c *context) SetPath(p string) {
+	c.path = p
+}
+
+func (c *context) Param(name string) string {
+	for i, n := range c.pnames {
+		if i < len(c.pvalues) {
+			if n == name {
+				return c.pvalues[i]
+			}
+
+			// Param name with aliases
+			for _, p := range strings.Split(n, ",") {
+				if p == name {
+					return c.pvalues[i]
+				}
+			}
+		}
+	}
+	return ""
+}
+
+func (c *context) ParamNames() []string {
+	return c.pnames
+}
+
+func (c *context) SetParamNames(names ...string) {
+	c.pnames = names
+}
+
+func (c *context) ParamValues() []string {
+	return c.pvalues
+}
+
+func (c *context) SetParamValues(values ...string) {
+	c.pvalues = values
+}
+
+func (c *context) QueryParam(name string) string {
+	if c.query == nil {
+		c.query = c.request.URL.Query()
+	}
+	return c.query.Get(name)
+}
+
+func (c *context) QueryParams() url.Values {
+	if c.query == nil {
+		c.query = c.request.URL.Query()
+	}
+	return c.query
+}
+
+func (c *context) QueryString() string {
+	return c.request.URL.RawQuery
+}
+
+func (c *context) FormValue(name string) string {
+	return c.request.FormValue(name)
+}
+
+func (c *context) FormParams() (url.Values, error) {
+	if strings.HasPrefix(c.request.Header.Get(HeaderContentType), MIMEMultipartForm) {
+		if err := c.request.ParseMultipartForm(defaultMemory); err != nil {
+			return nil, err
+		}
+	} else {
+		if err := c.request.ParseForm(); err != nil {
+			return nil, err
+		}
+	}
+	return c.request.Form, nil
+}
+
+func (c *context) FormFile(name string) (*multipart.FileHeader, error) {
+	_, fh, err := c.request.FormFile(name)
+	return fh, err
+}
+
+func (c *context) MultipartForm() (*multipart.Form, error) {
+	err := c.request.ParseMultipartForm(defaultMemory)
+	return c.request.MultipartForm, err
+}
+
+func (c *context) Cookie(name string) (*http.Cookie, error) {
+	return c.request.Cookie(name)
+}
+
+func (c *context) SetCookie(cookie *http.Cookie) {
+	http.SetCookie(c.Response(), cookie)
+}
+
+func (c *context) Cookies() []*http.Cookie {
+	return c.request.Cookies()
+}
+
+func (c *context) Get(key string) interface{} {
+	return c.store[key]
+}
+
+func (c *context) Set(key string, val interface{}) {
+	if c.store == nil {
+		c.store = make(Map)
+	}
+	c.store[key] = val
+}
+
+func (c *context) Bind(i interface{}) error {
+	return c.echo.Binder.Bind(i, c)
+}
+
+func (c *context) Validate(i interface{}) error {
+	if c.echo.Validator == nil {
+		return ErrValidatorNotRegistered
+	}
+	return c.echo.Validator.Validate(i)
+}
+
+func (c *context) Render(code int, name string, data interface{}) (err error) {
+	if c.echo.Renderer == nil {
+		return ErrRendererNotRegistered
+	}
+	buf := new(bytes.Buffer)
+	if err = c.echo.Renderer.Render(buf, name, data, c); err != nil {
+		return
+	}
+	return c.HTMLBlob(code, buf.Bytes())
+}
+
+func (c *context) HTML(code int, html string) (err error) {
+	return c.HTMLBlob(code, []byte(html))
+}
+
+func (c *context) HTMLBlob(code int, b []byte) (err error) {
+	return c.Blob(code, MIMETextHTMLCharsetUTF8, b)
+}
+
+func (c *context) String(code int, s string) (err error) {
+	return c.Blob(code, MIMETextPlainCharsetUTF8, []byte(s))
+}
+
+func (c *context) JSON(code int, i interface{}) (err error) {
+	if c.echo.Debug {
+		return c.JSONPretty(code, i, "  ")
+	}
+	b, err := json.Marshal(i)
+	if err != nil {
+		return
+	}
+	return c.JSONBlob(code, b)
+}
+
+func (c *context) JSONPretty(code int, i interface{}, indent string) (err error) {
+	b, err := json.MarshalIndent(i, "", indent)
+	if err != nil {
+		return
+	}
+	return c.JSONBlob(code, b)
+}
+
+func (c *context) JSONBlob(code int, b []byte) (err error) {
+	return c.Blob(code, MIMEApplicationJSONCharsetUTF8, b)
+}
+
+func (c *context) JSONP(code int, callback string, i interface{}) (err error) {
+	b, err := json.Marshal(i)
+	if err != nil {
+		return
+	}
+	return c.JSONPBlob(code, callback, b)
+}
+
+func (c *context) JSONPBlob(code int, callback string, b []byte) (err error) {
+	c.response.Header().Set(HeaderContentType, MIMEApplicationJavaScriptCharsetUTF8)
+	c.response.WriteHeader(code)
+	if _, err = c.response.Write([]byte(callback + "(")); err != nil {
+		return
+	}
+	if _, err = c.response.Write(b); err != nil {
+		return
+	}
+	_, err = c.response.Write([]byte(");"))
+	return
+}
+
+func (c *context) XML(code int, i interface{}) (err error) {
+	if c.echo.Debug {
+		return c.XMLPretty(code, i, "  ")
+	}
+	b, err := xml.Marshal(i)
+	if err != nil {
+		return
+	}
+	return c.XMLBlob(code, b)
+}
+
+func (c *context) XMLPretty(code int, i interface{}, indent string) (err error) {
+	b, err := xml.MarshalIndent(i, "", indent)
+	if err != nil {
+		return
+	}
+	return c.XMLBlob(code, b)
+}
+
+func (c *context) XMLBlob(code int, b []byte) (err error) {
+	c.response.Header().Set(HeaderContentType, MIMEApplicationXMLCharsetUTF8)
+	c.response.WriteHeader(code)
+	if _, err = c.response.Write([]byte(xml.Header)); err != nil {
+		return
+	}
+	_, err = c.response.Write(b)
+	return
+}
+
+func (c *context) Blob(code int, contentType string, b []byte) (err error) {
+	c.response.Header().Set(HeaderContentType, contentType)
+	c.response.WriteHeader(code)
+	_, err = c.response.Write(b)
+	return
+}
+
+func (c *context) Stream(code int, contentType string, r io.Reader) (err error) {
+	c.response.Header().Set(HeaderContentType, contentType)
+	c.response.WriteHeader(code)
+	_, err = io.Copy(c.response, r)
+	return
+}
+
+func (c *context) File(file string) error {
+	f, err := os.Open(file)
+	if err != nil {
+		return ErrNotFound
+	}
+	defer f.Close()
+
+	fi, _ := f.Stat()
+	if fi.IsDir() {
+		file = filepath.Join(file, indexPage)
+		f, err = os.Open(file)
+		if err != nil {
+			return ErrNotFound
+		}
+		defer f.Close()
+		if fi, err = f.Stat(); err != nil {
+			return err
+		}
+	}
+	http.ServeContent(c.Response(), c.Request(), fi.Name(), fi.ModTime(), f)
+	return nil
+}
+
+func (c *context) Attachment(file, name string) (err error) {
+	return c.contentDisposition(file, name, "attachment")
+}
+
+func (c *context) Inline(file, name string) (err error) {
+	return c.contentDisposition(file, name, "inline")
+}
+
+func (c *context) contentDisposition(file, name, dispositionType string) (err error) {
+	c.response.Header().Set(HeaderContentDisposition, fmt.Sprintf("%s; filename=%s", dispositionType, name))
+	c.File(file)
+	return
+}
+
+func (c *context) NoContent(code int) error {
+	c.response.WriteHeader(code)
+	return nil
+}
+
+func (c *context) Redirect(code int, url string) error {
+	if code < http.StatusMultipleChoices || code > http.StatusTemporaryRedirect {
+		return ErrInvalidRedirectCode
+	}
+	c.response.Header().Set(HeaderLocation, url)
+	c.response.WriteHeader(code)
+	return nil
+}
+
+func (c *context) Error(err error) {
+	c.echo.HTTPErrorHandler(err, c)
+}
+
+func (c *context) Echo() *Echo {
+	return c.echo
+}
+
+func (c *context) Handler() HandlerFunc {
+	return c.handler
+}
+
+func (c *context) SetHandler(h HandlerFunc) {
+	c.handler = h
+}
+
+func (c *context) Logger() Logger {
+	return c.echo.Logger
+}
+
+func (c *context) Reset(r *http.Request, w http.ResponseWriter) {
+	c.request = r
+	c.response.reset(w)
+	c.query = nil
+	c.handler = NotFoundHandler
+	c.store = nil
+}

vendor/github.com/labstack/echo/cookbook/auto-tls/server.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"net/http"
+
+	"golang.org/x/crypto/acme/autocert"
+
+	"github.com/labstack/echo"
+	"github.com/labstack/echo/middleware"
+)
+
+func main() {
+	e := echo.New()
+	// e.AutoTLSManager.HostPolicy = autocert.HostWhitelist("<DOMAIN>")
+	// Cache certificates
+	e.AutoTLSManager.Cache = autocert.DirCache("/var/www/.cache")
+	e.Use(middleware.Recover())
+	e.Use(middleware.Logger())
+	e.GET("/", func(c echo.Context) error {
+		return c.HTML(http.StatusOK, `
+			<h1>Welcome to Echo!</h1>
+			<h3>TLS certificates automatically installed from Let's Encrypt :)</h3>
+		`)
+	})
+	e.Logger.Fatal(e.StartAutoTLS(":443"))
+}

vendor/github.com/labstack/echo/cookbook/cors/server.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/labstack/echo"
+	"github.com/labstack/echo/middleware"
+)
+
+var (
+	users = []string{"Joe", "Veer", "Zion"}
+)
+
+func getUsers(c echo.Context) error {
+	return c.JSON(http.StatusOK, users)
+}
+
+func main() {
+	e := echo.New()
+	e.Use(middleware.Logger())
+	e.Use(middleware.Recover())
+
+	// CORS default
+	// Allows requests from any origin wth GET, HEAD, PUT, POST or DELETE method.
+	// e.Use(middleware.CORS())
+
+	// CORS restricted
+	// Allows requests from any `https://labstack.com` or `https://labstack.net` origin
+	// wth GET, PUT, POST or DELETE method.
+	e.Use(middleware.CORSWithConfig(middleware.CORSConfig{
+		AllowOrigins: []string{"https://labstack.com", "https://labstack.net"},
+		AllowMethods: []string{echo.GET, echo.PUT, echo.POST, echo.DELETE},
+	}))
+
+	e.GET("/api/users", getUsers)
+
+	e.Logger.Fatal(e.Start(":1323"))
+}

vendor/github.com/labstack/echo/cookbook/crud/server.go

@@ -0,0 +1,75 @@
+package main
+
+import (
+	"net/http"
+	"strconv"
+
+	"github.com/labstack/echo"
+	"github.com/labstack/echo/middleware"
+)
+
+type (
+	user struct {
+		ID   int    `json:"id"`
+		Name string `json:"name"`
+	}
+)
+
+var (
+	users = map[int]*user{}
+	seq   = 1
+)
+
+//----------
+// Handlers
+//----------
+
+func createUser(c echo.Context) error {
+	u := &user{
+		ID: seq,
+	}
+	if err := c.Bind(u); err != nil {
+		return err
+	}
+	users[u.ID] = u
+	seq++
+	return c.JSON(http.StatusCreated, u)
+}
+
+func getUser(c echo.Context) error {
+	id, _ := strconv.Atoi(c.Param("id"))
+	return c.JSON(http.StatusOK, users[id])
+}
+
+func updateUser(c echo.Context) error {
+	u := new(user)
+	if err := c.Bind(u); err != nil {
+		return err
+	}
+	id, _ := strconv.Atoi(c.Param("id"))
+	users[id].Name = u.Name
+	return c.JSON(http.StatusOK, users[id])
+}
+
+func deleteUser(c echo.Context) error {
+	id, _ := strconv.Atoi(c.Param("id"))
+	delete(users, id)
+	return c.NoContent(http.StatusNoContent)
+}
+
+func main() {
+	e := echo.New()
+
+	// Middleware
+	e.Use(middleware.Logger())
+	e.Use(middleware.Recover())
+
+	// Routes
+	e.POST("/users", createUser)
+	e.GET("/users/:id", getUser)
+	e.PUT("/users/:id", updateUser)
+	e.DELETE("/users/:id", deleteUser)
+
+	// Start server
+	e.Logger.Fatal(e.Start(":1323"))
+}

vendor/github.com/labstack/echo/cookbook/embed-resources/server.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"net/http"
+
+	rice "github.com/GeertJohan/go.rice"
+	"github.com/labstack/echo"
+)
+
+func main() {
+	e := echo.New()
+	// the file server for rice. "app" is the folder where the files come from.
+	assetHandler := http.FileServer(rice.MustFindBox("app").HTTPBox())
+	// serves the index.html from rice
+	e.GET("/", echo.WrapHandler(assetHandler))
+
+	// servers other static files
+	e.GET("/static/*", echo.WrapHandler(http.StripPrefix("/static/", assetHandler)))
+
+	e.Logger.Fatal(e.Start(":1323"))
+}

vendor/github.com/labstack/echo/cookbook/file-upload/multiple/server.go

@@ -0,0 +1,65 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"os"
+
+	"net/http"
+
+	"github.com/labstack/echo"
+	"github.com/labstack/echo/middleware"
+)
+
+func upload(c echo.Context) error {
+	// Read form fields
+	name := c.FormValue("name")
+	email := c.FormValue("email")
+
+	//------------
+	// Read files
+	//------------
+
+	// Multipart form
+	form, err := c.MultipartForm()
+	if err != nil {
+		return err
+	}
+	files := form.File["files"]
+
+	for _, file := range files {
+		// Source
+		src, err := file.Open()
+		if err != nil {
+			return err
+		}
+		defer src.Close()
+
+		// Destination
+		dst, err := os.Create(file.Filename)
+		if err != nil {
+			return err
+		}
+		defer dst.Close()
+
+		// Copy
+		if _, err = io.Copy(dst, src); err != nil {
+			return err
+		}
+
+	}
+
+	return c.HTML(http.StatusOK, fmt.Sprintf("<p>Uploaded successfully %d files with fields name=%s and email=%s.</p>", len(files), name, email))
+}
+
+func main() {
+	e := echo.New()
+
+	e.Use(middleware.Logger())
+	e.Use(middleware.Recover())
+
+	e.Static("/", "public")
+	e.POST("/upload", upload)
+
+	e.Logger.Fatal(e.Start(":1323"))
+}

vendor/github.com/labstack/echo/cookbook/file-upload/single/server.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"os"
+
+	"net/http"
+
+	"github.com/labstack/echo"
+	"github.com/labstack/echo/middleware"
+)
+
+func upload(c echo.Context) error {
+	// Read form fields
+	name := c.FormValue("name")
+	email := c.FormValue("email")
+
+	//-----------
+	// Read file
+	//-----------
+
+	// Source
+	file, err := c.FormFile("file")
+	if err != nil {
+		return err
+	}
+	src, err := file.Open()
+	if err != nil {
+		return err
+	}
+	defer src.Close()
+
+	// Destination
+	dst, err := os.Create(file.Filename)
+	if err != nil {
+		return err
+	}
+	defer dst.Close()
+
+	// Copy
+	if _, err = io.Copy(dst, src); err != nil {
+		return err
+	}
+
+	return c.HTML(http.StatusOK, fmt.Sprintf("<p>File %s uploaded successfully with fields name=%s and email=%s.</p>", file.Filename, name, email))
+}
+
+func main() {
+	e := echo.New()
+
+	e.Use(middleware.Logger())
+	e.Use(middleware.Recover())
+
+	e.Static("/", "public")
+	e.POST("/upload", upload)
+
+	e.Logger.Fatal(e.Start(":1323"))
+}

vendor/github.com/labstack/echo/cookbook/google-app-engine/app-engine.go

@@ -0,0 +1,17 @@
+// +build appengine
+
+package main
+
+import (
+	"net/http"
+
+	"github.com/labstack/echo"
+)
+
+func createMux() *echo.Echo {
+	e := echo.New()
+	// note: we don't need to provide the middleware or static handlers, that's taken care of by the platform
+	// app engine has it's own "main" wrapper - we just need to hook echo into the default handler
+	http.Handle("/", e)
+	return e
+}

vendor/github.com/labstack/echo/cookbook/google-app-engine/app-managed.go

@@ -0,0 +1,25 @@
+// +build appenginevm
+
+package main
+
+import (
+	"net/http"
+
+	"github.com/labstack/echo"
+	"google.golang.org/appengine"
+)
+
+func createMux() *echo.Echo {
+	e := echo.New()
+	// note: we don't need to provide the middleware or static handlers
+	// for the appengine vm version - that's taken care of by the platform
+	return e
+}
+
+func main() {
+	// the appengine package provides a convenient method to handle the health-check requests
+	// and also run the app on the correct port. We just need to add Echo to the default handler
+	e := echo.New(":8080")
+	http.Handle("/", e)
+	appengine.Main()
+}

vendor/github.com/labstack/echo/cookbook/google-app-engine/app-standalone.go

@@ -0,0 +1,24 @@
+// +build !appengine,!appenginevm
+
+package main
+
+import (
+	"github.com/labstack/echo"
+	"github.com/labstack/echo/middleware"
+)
+
+func createMux() *echo.Echo {
+	e := echo.New()
+
+	e.Use(middleware.Recover())
+	e.Use(middleware.Logger())
+	e.Use(middleware.Gzip())
+
+	e.Static("/", "public")
+
+	return e
+}
+
+func main() {
+	e.Logger.Fatal(e.Start(":8080"))
+}

vendor/github.com/labstack/echo/cookbook/google-app-engine/app.go

@@ -0,0 +1,4 @@
+package main
+
+// reference our echo instance and create it early
+var e = createMux()

vendor/github.com/labstack/echo/cookbook/google-app-engine/users.go

@@ -0,0 +1,54 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/labstack/echo"
+	"github.com/labstack/echo/middleware"
+)
+
+type (
+	user struct {
+		ID   string `json:"id"`
+		Name string `json:"name"`
+	}
+)
+
+var (
+	users map[string]user
+)
+
+func init() {
+	users = map[string]user{
+		"1": user{
+			ID:   "1",
+			Name: "Wreck-It Ralph",
+		},
+	}
+
+	// hook into the echo instance to create an endpoint group
+	// and add specific middleware to it plus handlers
+	g := e.Group("/users")
+	g.Use(middleware.CORS())
+
+	g.POST("", createUser)
+	g.GET("", getUsers)
+	g.GET("/:id", getUser)
+}
+
+func createUser(c echo.Context) error {
+	u := new(user)
+	if err := c.Bind(u); err != nil {
+		return err
+	}
+	users[u.ID] = *u
+	return c.JSON(http.StatusCreated, u)
+}
+
+func getUsers(c echo.Context) error {
+	return c.JSON(http.StatusOK, users)
+}
+
+func getUser(c echo.Context) error {
+	return c.JSON(http.StatusOK, users[c.Param("id")])
+}

vendor/github.com/labstack/echo/cookbook/google-app-engine/welcome.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"html/template"
+	"io"
+	"net/http"
+
+	"github.com/labstack/echo"
+)
+
+type (
+	Template struct {
+		templates *template.Template
+	}
+)
+
+func init() {
+	t := &Template{
+		templates: template.Must(template.ParseFiles("templates/welcome.html")),
+	}
+	e.Renderer = t
+	e.GET("/welcome", welcome)
+}
+
+func (t *Template) Render(w io.Writer, name string, data interface{}, c echo.Context) error {
+	return t.templates.ExecuteTemplate(w, name, data)
+}
+
+func welcome(c echo.Context) error {
+	return c.Render(http.StatusOK, "welcome", "Joe")
+}

vendor/github.com/labstack/echo/cookbook/graceful-shutdown/grace/server.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/facebookgo/grace/gracehttp"
+	"github.com/labstack/echo"
+)
+
+func main() {
+	// Setup
+	e := echo.New()
+	e.GET("/", func(c echo.Context) error {
+		return c.String(http.StatusOK, "Six sick bricks tick")
+	})
+	e.Server.Addr = ":1323"
+
+	// Serve it like a boss
+	e.Logger.Fatal(gracehttp.Serve(e.Server))
+}

vendor/github.com/labstack/echo/cookbook/graceful-shutdown/graceful/server.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"net/http"
+	"time"
+
+	"github.com/labstack/echo"
+	"github.com/tylerb/graceful"
+)
+
+func main() {
+	// Setup
+	e := echo.New()
+	e.GET("/", func(c echo.Context) error {
+		return c.String(http.StatusOK, "Sue sews rose on slow joe crows nose")
+	})
+	e.Server.Addr = ":1323"
+
+	// Serve it like a boss
+	graceful.ListenAndServe(e.Server, 5*time.Second)
+}

vendor/github.com/labstack/echo/cookbook/hello-world/server.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/labstack/echo"
+	"github.com/labstack/echo/middleware"
+)
+
+func main() {
+	// Echo instance
+	e := echo.New()
+
+	// Middleware
+	e.Use(middleware.Logger())
+	e.Use(middleware.Recover())
+
+	// Route => handler
+	e.GET("/", func(c echo.Context) error {
+		return c.String(http.StatusOK, "Hello, World!\n")
+	})
+
+	// Start server
+	e.Logger.Fatal(e.Start(":1323"))
+}

vendor/github.com/labstack/echo/cookbook/http2/server.go

@@ -0,0 +1,42 @@
+package main
+
+import (
+	"fmt"
+	"net/http"
+	"time"
+
+	"github.com/labstack/echo"
+)
+
+func request(c echo.Context) error {
+	req := c.Request()
+	format := "<pre><strong>Request Information</strong>\n\n<code>Protocol: %s\nHost: %s\nRemote Address: %s\nMethod: %s\nPath: %s\n</code></pre>"
+	return c.HTML(http.StatusOK, fmt.Sprintf(format, req.Proto, req.Host, req.RemoteAddr, req.Method, req.URL.Path))
+}
+
+func stream(c echo.Context) error {
+	res := c.Response()
+	gone := res.CloseNotify()
+	res.Header().Set(echo.HeaderContentType, echo.MIMETextHTMLCharsetUTF8)
+	res.WriteHeader(http.StatusOK)
+	ticker := time.NewTicker(1 * time.Second)
+	defer ticker.Stop()
+
+	fmt.Fprint(res, "<pre><strong>Clock Stream</strong>\n\n<code>")
+	for {
+		fmt.Fprintf(res, "%v\n", time.Now())
+		res.Flush()
+		select {
+		case <-ticker.C:
+		case <-gone:
+			break
+		}
+	}
+}
+
+func main() {
+	e := echo.New()
+	e.GET("/request", request)
+	e.GET("/stream", stream)
+	e.Logger.Fatal(e.StartTLS(":1323", "cert.pem", "key.pem"))
+}

vendor/github.com/labstack/echo/cookbook/jsonp/server.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"math/rand"
+	"net/http"
+	"time"
+
+	"github.com/labstack/echo"
+	"github.com/labstack/echo/middleware"
+)
+
+func main() {
+	e := echo.New()
+	e.Use(middleware.Logger())
+	e.Use(middleware.Recover())
+
+	e.Static("/", "public")
+
+	// JSONP
+	e.GET("/jsonp", func(c echo.Context) error {
+		callback := c.QueryParam("callback")
+		var content struct {
+			Response  string    `json:"response"`
+			Timestamp time.Time `json:"timestamp"`
+			Random    int       `json:"random"`
+		}
+		content.Response = "Sent via JSONP"
+		content.Timestamp = time.Now().UTC()
+		content.Random = rand.Intn(1000)
+		return c.JSONP(http.StatusOK, callback, &content)
+	})
+
+	// Start server
+	e.Logger.Fatal(e.Start(":1323"))
+}

vendor/github.com/labstack/echo/cookbook/jwt/custom-claims/server.go

@@ -0,0 +1,86 @@
+package main
+
+import (
+	"net/http"
+	"time"
+
+	jwt "github.com/dgrijalva/jwt-go"
+	"github.com/labstack/echo"
+	"github.com/labstack/echo/middleware"
+)
+
+// jwtCustomClaims are custom claims extending default ones.
+type jwtCustomClaims struct {
+	Name  string `json:"name"`
+	Admin bool   `json:"admin"`
+	jwt.StandardClaims
+}
+
+func login(c echo.Context) error {
+	username := c.FormValue("username")
+	password := c.FormValue("password")
+
+	if username == "jon" && password == "shhh!" {
+
+		// Set custom claims
+		claims := &jwtCustomClaims{
+			"Jon Snow",
+			true,
+			jwt.StandardClaims{
+				ExpiresAt: time.Now().Add(time.Hour * 72).Unix(),
+			},
+		}
+
+		// Create token with claims
+		token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+
+		// Generate encoded token and send it as response.
+		t, err := token.SignedString([]byte("secret"))
+		if err != nil {
+			return err
+		}
+		return c.JSON(http.StatusOK, echo.Map{
+			"token": t,
+		})
+	}
+
+	return echo.ErrUnauthorized
+}
+
+func accessible(c echo.Context) error {
+	return c.String(http.StatusOK, "Accessible")
+}
+
+func restricted(c echo.Context) error {
+	user := c.Get("user").(*jwt.Token)
+	claims := user.Claims.(*jwtCustomClaims)
+	name := claims.Name
+	return c.String(http.StatusOK, "Welcome "+name+"!")
+}
+
+func main() {
+	e := echo.New()
+
+	// Middleware
+	e.Use(middleware.Logger())
+	e.Use(middleware.Recover())
+
+	// Login route
+	e.POST("/login", login)
+
+	// Unauthenticated route
+	e.GET("/", accessible)
+
+	// Restricted group
+	r := e.Group("/restricted")
+
+	// Configure middleware with the custom claims type
+	config := middleware.JWTConfig{
+		Claims:     &jwtCustomClaims{},
+		SigningKey: []byte("secret"),
+	}
+	r.Use(middleware.JWTWithConfig(config))
+	r.GET("", restricted)
+
+	e.Logger.Fatal(e.Start(":1323"))
+}

vendor/github.com/labstack/echo/cookbook/jwt/map-claims/server.go

@@ -0,0 +1,69 @@
+package main
+
+import (
+	"net/http"
+	"time"
+
+	jwt "github.com/dgrijalva/jwt-go"
+	"github.com/labstack/echo"
+	"github.com/labstack/echo/middleware"
+)
+
+func login(c echo.Context) error {
+	username := c.FormValue("username")
+	password := c.FormValue("password")
+
+	if username == "jon" && password == "shhh!" {
+		// Create token
+		token := jwt.New(jwt.SigningMethodHS256)
+
+		// Set claims
+		claims := token.Claims.(jwt.MapClaims)
+		claims["name"] = "Jon Snow"
+		claims["admin"] = true
+		claims["exp"] = time.Now().Add(time.Hour * 72).Unix()
+
+		// Generate encoded token and send it as response.
+		t, err := token.SignedString([]byte("secret"))
+		if err != nil {
+			return err
+		}
+		return c.JSON(http.StatusOK, map[string]string{
+			"token": t,
+		})
+	}
+
+	return echo.ErrUnauthorized
+}
+
+func accessible(c echo.Context) error {
+	return c.String(http.StatusOK, "Accessible")
+}
+
+func restricted(c echo.Context) error {
+	user := c.Get("user").(*jwt.Token)
+	claims := user.Claims.(jwt.MapClaims)
+	name := claims["name"].(string)
+	return c.String(http.StatusOK, "Welcome "+name+"!")
+}
+
+func main() {
+	e := echo.New()
+
+	// Middleware
+	e.Use(middleware.Logger())
+	e.Use(middleware.Recover())
+
+	// Login route
+	e.POST("/login", login)
+
+	// Unauthenticated route
+	e.GET("/", accessible)
+
+	// Restricted group
+	r := e.Group("/restricted")
+	r.Use(middleware.JWT([]byte("secret")))
+	r.GET("", restricted)
+
+	e.Logger.Fatal(e.Start(":1323"))
+}

vendor/github.com/labstack/echo/cookbook/middleware/server.go

@@ -0,0 +1,82 @@
+package main
+
+import (
+	"net/http"
+	"strconv"
+	"sync"
+	"time"
+
+	"github.com/labstack/echo"
+)
+
+type (
+	Stats struct {
+		Uptime       time.Time      `json:"uptime"`
+		RequestCount uint64         `json:"requestCount"`
+		Statuses     map[string]int `json:"statuses"`
+		mutex        sync.RWMutex
+	}
+)
+
+func NewStats() *Stats {
+	return &Stats{
+		Uptime:   time.Now(),
+		Statuses: make(map[string]int),
+	}
+}
+
+// Process is the middleware function.
+func (s *Stats) Process(next echo.HandlerFunc) echo.HandlerFunc {
+	return func(c echo.Context) error {
+		if err := next(c); err != nil {
+			c.Error(err)
+		}
+		s.mutex.Lock()
+		defer s.mutex.Unlock()
+		s.RequestCount++
+		status := strconv.Itoa(c.Response().Status)
+		s.Statuses[status]++
+		return nil
+	}
+}
+
+// Handle is the endpoint to get stats.
+func (s *Stats) Handle(c echo.Context) error {
+	s.mutex.RLock()
+	defer s.mutex.RUnlock()
+	return c.JSON(http.StatusOK, s)
+}
+
+// ServerHeader middleware adds a `Server` header to the response.
+func ServerHeader(next echo.HandlerFunc) echo.HandlerFunc {
+	return func(c echo.Context) error {
+		c.Response().Header().Set(echo.HeaderServer, "Echo/3.0")
+		return next(c)
+	}
+}
+
+func main() {
+	e := echo.New()
+
+	// Debug mode
+	e.Debug = true
+
+	//-------------------
+	// Custom middleware
+	//-------------------
+	// Stats
+	s := NewStats()
+	e.Use(s.Process)
+	e.GET("/stats", s.Handle) // Endpoint to get stats
+
+	// Server header
+	e.Use(ServerHeader)
+
+	// Handler
+	e.GET("/", func(c echo.Context) error {
+		return c.String(http.StatusOK, "Hello, World!")
+	})
+
+	// Start server
+	e.Logger.Fatal(e.Start(":1323"))
+}

vendor/github.com/labstack/echo/cookbook/streaming-response/server.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"net/http"
+	"time"
+
+	"encoding/json"
+
+	"github.com/labstack/echo"
+)
+
+type (
+	Geolocation struct {
+		Altitude  float64
+		Latitude  float64
+		Longitude float64
+	}
+)
+
+var (
+	locations = []Geolocation{
+		{-97, 37.819929, -122.478255},
+		{1899, 39.096849, -120.032351},
+		{2619, 37.865101, -119.538329},
+		{42, 33.812092, -117.918974},
+		{15, 37.77493, -122.419416},
+	}
+)
+
+func main() {
+	e := echo.New()
+	e.GET("/", func(c echo.Context) error {
+		c.Response().Header().Set(echo.HeaderContentType, echo.MIMEApplicationJSON)
+		c.Response().WriteHeader(http.StatusOK)
+		for _, l := range locations {
+			if err := json.NewEncoder(c.Response()).Encode(l); err != nil {
+				return err
+			}
+			c.Response().Flush()
+			time.Sleep(1 * time.Second)
+		}
+		return nil
+	})
+	e.Logger.Fatal(e.Start(":1323"))
+}

vendor/github.com/labstack/echo/cookbook/subdomains/server.go

@@ -0,0 +1,78 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/labstack/echo"
+	"github.com/labstack/echo/middleware"
+)
+
+type (
+	Host struct {
+		Echo *echo.Echo
+	}
+)
+
+func main() {
+	// Hosts
+	hosts := make(map[string]*Host)
+
+	//-----
+	// API
+	//-----
+
+	api := echo.New()
+	api.Use(middleware.Logger())
+	api.Use(middleware.Recover())
+
+	hosts["api.localhost:1323"] = &Host{api}
+
+	api.GET("/", func(c echo.Context) error {
+		return c.String(http.StatusOK, "API")
+	})
+
+	//------
+	// Blog
+	//------
+
+	blog := echo.New()
+	blog.Use(middleware.Logger())
+	blog.Use(middleware.Recover())
+
+	hosts["blog.localhost:1323"] = &Host{blog}
+
+	blog.GET("/", func(c echo.Context) error {
+		return c.String(http.StatusOK, "Blog")
+	})
+
+	//---------
+	// Website
+	//---------
+
+	site := echo.New()
+	site.Use(middleware.Logger())
+	site.Use(middleware.Recover())
+
+	hosts["localhost:1323"] = &Host{site}
+
+	site.GET("/", func(c echo.Context) error {
+		return c.String(http.StatusOK, "Website")
+	})
+
+	// Server
+	e := echo.New()
+	e.Any("/*", func(c echo.Context) (err error) {
+		req := c.Request()
+		res := c.Response()
+		host := hosts[req.Host]
+
+		if host == nil {
+			err = echo.ErrNotFound
+		} else {
+			host.Echo.ServeHTTP(res, req)
+		}
+
+		return
+	})
+	e.Logger.Fatal(e.Start(":1323"))
+}

vendor/github.com/labstack/echo/cookbook/twitter/handler/handler.go

@@ -0,0 +1,14 @@
+package handler
+
+import mgo "gopkg.in/mgo.v2"
+
+type (
+	Handler struct {
+		DB *mgo.Session
+	}
+)
+
+const (
+	// Key (Should come from somewhere else).
+	Key = "secret"
+)

vendor/github.com/labstack/echo/cookbook/twitter/handler/post.go

@@ -0,0 +1,73 @@
+package handler
+
+import (
+	"net/http"
+	"strconv"
+
+	"github.com/labstack/echo"
+	"github.com/labstack/echo/cookbook/twitter/model"
+	mgo "gopkg.in/mgo.v2"
+	"gopkg.in/mgo.v2/bson"
+)
+
+func (h *Handler) CreatePost(c echo.Context) (err error) {
+	u := &model.User{
+		ID: bson.ObjectIdHex(userIDFromToken(c)),
+	}
+	p := &model.Post{
+		ID:   bson.NewObjectId(),
+		From: u.ID.Hex(),
+	}
+	if err = c.Bind(p); err != nil {
+		return
+	}
+
+	// Validation
+	if p.To == "" || p.Message == "" {
+		return &echo.HTTPError{Code: http.StatusBadRequest, Message: "invalid to or message fields"}
+	}
+
+	// Find user from database
+	db := h.DB.Clone()
+	defer db.Close()
+	if err = db.DB("twitter").C("users").FindId(u.ID).One(u); err != nil {
+		if err == mgo.ErrNotFound {
+			return echo.ErrNotFound
+		}
+		return
+	}
+
+	// Save post in database
+	if err = db.DB("twitter").C("posts").Insert(p); err != nil {
+		return
+	}
+	return c.JSON(http.StatusCreated, p)
+}
+
+func (h *Handler) FetchPost(c echo.Context) (err error) {
+	userID := userIDFromToken(c)
+	page, _ := strconv.Atoi(c.QueryParam("page"))
+	limit, _ := strconv.Atoi(c.QueryParam("limit"))
+
+	// Defaults
+	if page == 0 {
+		page = 1
+	}
+	if limit == 0 {
+		limit = 100
+	}
+
+	// Retrieve posts from database
+	posts := []*model.Post{}
+	db := h.DB.Clone()
+	if err = db.DB("twitter").C("posts").
+		Find(bson.M{"to": userID}).
+		Skip((page - 1) * limit).
+		Limit(limit).
+		All(&posts); err != nil {
+		return
+	}
+	defer db.Close()
+
+	return c.JSON(http.StatusOK, posts)
+}

vendor/github.com/labstack/echo/cookbook/twitter/handler/user.go

@@ -0,0 +1,97 @@
+package handler
+
+import (
+	"net/http"
+	"time"
+
+	jwt "github.com/dgrijalva/jwt-go"
+	"github.com/labstack/echo"
+	"github.com/labstack/echo/cookbook/twitter/model"
+	mgo "gopkg.in/mgo.v2"
+	"gopkg.in/mgo.v2/bson"
+)
+
+func (h *Handler) Signup(c echo.Context) (err error) {
+	// Bind
+	u := &model.User{ID: bson.NewObjectId()}
+	if err = c.Bind(u); err != nil {
+		return
+	}
+
+	// Validate
+	if u.Email == "" || u.Password == "" {
+		return &echo.HTTPError{Code: http.StatusBadRequest, Message: "invalid email or password"}
+	}
+
+	// Save user
+	db := h.DB.Clone()
+	defer db.Close()
+	if err = db.DB("twitter").C("users").Insert(u); err != nil {
+		return
+	}
+
+	return c.JSON(http.StatusCreated, u)
+}
+
+func (h *Handler) Login(c echo.Context) (err error) {
+	// Bind
+	u := new(model.User)
+	if err = c.Bind(u); err != nil {
+		return
+	}
+
+	// Find user
+	db := h.DB.Clone()
+	defer db.Close()
+	if err = db.DB("twitter").C("users").
+		Find(bson.M{"email": u.Email, "password": u.Password}).One(u); err != nil {
+		if err == mgo.ErrNotFound {
+			return &echo.HTTPError{Code: http.StatusUnauthorized, Message: "invalid email or password"}
+		}
+		return
+	}
+
+	//-----
+	// JWT
+	//-----
+
+	// Create token
+	token := jwt.New(jwt.SigningMethodHS256)
+
+	// Set claims
+	claims := token.Claims.(jwt.MapClaims)
+	claims["id"] = u.ID
+	claims["exp"] = time.Now().Add(time.Hour * 72).Unix()
+
+	// Generate encoded token and send it as response
+	u.Token, err = token.SignedString([]byte(Key))
+	if err != nil {
+		return err
+	}
+
+	u.Password = "" // Don't send password
+	return c.JSON(http.StatusOK, u)
+}
+
+func (h *Handler) Follow(c echo.Context) (err error) {
+	userID := userIDFromToken(c)
+	id := c.Param("id")
+
+	// Add a follower to user
+	db := h.DB.Clone()
+	defer db.Close()
+	if err = db.DB("twitter").C("users").
+		UpdateId(bson.ObjectIdHex(id), bson.M{"$addToSet": bson.M{"followers": userID}}); err != nil {
+		if err == mgo.ErrNotFound {
+			return echo.ErrNotFound
+		}
+	}
+
+	return
+}
+
+func userIDFromToken(c echo.Context) string {
+	user := c.Get("user").(*jwt.Token)
+	claims := user.Claims.(jwt.MapClaims)
+	return claims["id"].(string)
+}

vendor/github.com/labstack/echo/cookbook/twitter/model/post.go

@@ -0,0 +1,12 @@
+package model
+
+import "gopkg.in/mgo.v2/bson"
+
+type (
+	Post struct {
+		ID      bson.ObjectId `json:"id" bson:"_id,omitempty"`
+		To      string        `json:"to" bson:"to"`
+		From    string        `json:"from" bson:"from"`
+		Message string        `json:"message" bson:"message"`
+	}
+)

vendor/github.com/labstack/echo/cookbook/twitter/model/user.go

@@ -0,0 +1,13 @@
+package model
+
+import "gopkg.in/mgo.v2/bson"
+
+type (
+	User struct {
+		ID        bson.ObjectId `json:"id" bson:"_id,omitempty"`
+		Email     string        `json:"email" bson:"email"`
+		Password  string        `json:"password,omitempty" bson:"password"`
+		Token     string        `json:"token,omitempty" bson:"-"`
+		Followers []string      `json:"followers,omitempty" bson:"followers,omitempty"`
+	}
+)

vendor/github.com/labstack/echo/cookbook/twitter/server.go

@@ -0,0 +1,52 @@
+package main
+
+import (
+	"github.com/labstack/echo"
+	"github.com/labstack/echo/cookbook/twitter/handler"
+	"github.com/labstack/echo/middleware"
+	"github.com/labstack/gommon/log"
+	mgo "gopkg.in/mgo.v2"
+)
+
+func main() {
+	e := echo.New()
+	e.Logger.SetLevel(log.ERROR)
+	e.Use(middleware.Logger())
+	e.Use(middleware.JWTWithConfig(middleware.JWTConfig{
+		SigningKey: []byte(handler.Key),
+		Skipper: func(c echo.Context) bool {
+			// Skip authentication for and signup login requests
+			if c.Path() == "/login" || c.Path() == "/signup" {
+				return true
+			}
+			return false
+		},
+	}))
+
+	// Database connection
+	db, err := mgo.Dial("localhost")
+	if err != nil {
+		e.Logger.Fatal(err)
+	}
+
+	// Create indices
+	if err = db.Copy().DB("twitter").C("users").EnsureIndex(mgo.Index{
+		Key:    []string{"email"},
+		Unique: true,
+	}); err != nil {
+		log.Fatal(err)
+	}
+
+	// Initialize handler
+	h := &handler.Handler{DB: db}
+
+	// Routes
+	e.POST("/signup", h.Signup)
+	e.POST("/login", h.Login)
+	e.POST("/follow/:id", h.Follow)
+	e.POST("/posts", h.CreatePost)
+	e.GET("/feed", h.FetchPost)
+
+	// Start server
+	e.Logger.Fatal(e.Start(":1323"))
+}

vendor/github.com/labstack/echo/cookbook/websocket/gorilla/server.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/labstack/echo"
+
+	"github.com/gorilla/websocket"
+	"github.com/labstack/echo/middleware"
+)
+
+var (
+	upgrader = websocket.Upgrader{}
+)
+
+func hello(c echo.Context) error {
+	ws, err := upgrader.Upgrade(c.Response(), c.Request(), nil)
+	if err != nil {
+		return err
+	}
+	defer ws.Close()
+
+	for {
+		// Write
+		err := ws.WriteMessage(websocket.TextMessage, []byte("Hello, Client!"))
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		// Read
+		_, msg, err := ws.ReadMessage()
+		if err != nil {
+			log.Fatal(err)
+		}
+		fmt.Printf("%s\n", msg)
+	}
+}
+
+func main() {
+	e := echo.New()
+	e.Use(middleware.Logger())
+	e.Use(middleware.Recover())
+	e.Static("/", "../public")
+	e.GET("/ws", hello)
+	e.Logger.Fatal(e.Start(":1323"))
+}

vendor/github.com/labstack/echo/cookbook/websocket/net/server.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/labstack/echo"
+	"github.com/labstack/echo/middleware"
+	"golang.org/x/net/websocket"
+)
+
+func hello(c echo.Context) error {
+	websocket.Handler(func(ws *websocket.Conn) {
+		defer ws.Close()
+		for {
+			// Write
+			err := websocket.Message.Send(ws, "Hello, Client!")
+			if err != nil {
+				log.Fatal(err)
+			}
+
+			// Read
+			msg := ""
+			err = websocket.Message.Receive(ws, &msg)
+			if err != nil {
+				log.Fatal(err)
+			}
+			fmt.Printf("%s\n", msg)
+		}
+	}).ServeHTTP(c.Response(), c.Request())
+	return nil
+}
+
+func main() {
+	e := echo.New()
+	e.Use(middleware.Logger())
+	e.Use(middleware.Recover())
+	e.Static("/", "../public")
+	e.GET("/ws", hello)
+	e.Logger.Fatal(e.Start(":1323"))
+}

vendor/github.com/labstack/echo/echo.go

@@ -0,0 +1,666 @@
+/*
+Package echo implements high performance, minimalist Go web framework.
+
+Example:
+
+  package main
+
+  import (
+    "net/http"
+
+    "github.com/labstack/echo"
+    "github.com/labstack/echo/middleware"
+  )
+
+  // Handler
+  func hello(c echo.Context) error {
+    return c.String(http.StatusOK, "Hello, World!")
+  }
+
+  func main() {
+    // Echo instance
+    e := echo.New()
+
+    // Middleware
+    e.Use(middleware.Logger())
+    e.Use(middleware.Recover())
+
+    // Routes
+    e.GET("/", hello)
+
+    // Start server
+    e.Logger.Fatal(e.Start(":1323"))
+  }
+
+Learn more at https://echo.labstack.com
+*/
+package echo
+
+import (
+	"bytes"
+	"crypto/tls"
+	"errors"
+	"fmt"
+	"io"
+	slog "log"
+	"net"
+	"net/http"
+	"path"
+	"reflect"
+	"runtime"
+	"sync"
+	"time"
+
+	"github.com/labstack/gommon/color"
+	"github.com/labstack/gommon/log"
+	"golang.org/x/crypto/acme/autocert"
+)
+
+type (
+	// Echo is the top-level framework instance.
+	Echo struct {
+		stdLogger        *slog.Logger
+		colorer          *color.Color
+		premiddleware    []MiddlewareFunc
+		middleware       []MiddlewareFunc
+		maxParam         *int
+		router           *Router
+		notFoundHandler  HandlerFunc
+		pool             sync.Pool
+		Server           *http.Server
+		TLSServer        *http.Server
+		Listener         net.Listener
+		TLSListener      net.Listener
+		DisableHTTP2     bool
+		Debug            bool
+		HTTPErrorHandler HTTPErrorHandler
+		Binder           Binder
+		Validator        Validator
+		Renderer         Renderer
+		AutoTLSManager   autocert.Manager
+		Mutex            sync.RWMutex
+		Logger           Logger
+	}
+
+	// Route contains a handler and information for matching against requests.
+	Route struct {
+		Method  string
+		Path    string
+		Handler string
+	}
+
+	// HTTPError represents an error that occurred while handling a request.
+	HTTPError struct {
+		Code    int
+		Message interface{}
+	}
+
+	// MiddlewareFunc defines a function to process middleware.
+	MiddlewareFunc func(HandlerFunc) HandlerFunc
+
+	// HandlerFunc defines a function to server HTTP requests.
+	HandlerFunc func(Context) error
+
+	// HTTPErrorHandler is a centralized HTTP error handler.
+	HTTPErrorHandler func(error, Context)
+
+	// Validator is the interface that wraps the Validate function.
+	Validator interface {
+		Validate(i interface{}) error
+	}
+
+	// Renderer is the interface that wraps the Render function.
+	Renderer interface {
+		Render(io.Writer, string, interface{}, Context) error
+	}
+
+	// Map defines a generic map of type `map[string]interface{}`.
+	Map map[string]interface{}
+
+	// i is the interface for Echo and Group.
+	i interface {
+		GET(string, HandlerFunc, ...MiddlewareFunc)
+	}
+)
+
+// HTTP methods
+const (
+	CONNECT = "CONNECT"
+	DELETE  = "DELETE"
+	GET     = "GET"
+	HEAD    = "HEAD"
+	OPTIONS = "OPTIONS"
+	PATCH   = "PATCH"
+	POST    = "POST"
+	PUT     = "PUT"
+	TRACE   = "TRACE"
+)
+
+// MIME types
+const (
+	MIMEApplicationJSON                  = "application/json"
+	MIMEApplicationJSONCharsetUTF8       = MIMEApplicationJSON + "; " + charsetUTF8
+	MIMEApplicationJavaScript            = "application/javascript"
+	MIMEApplicationJavaScriptCharsetUTF8 = MIMEApplicationJavaScript + "; " + charsetUTF8
+	MIMEApplicationXML                   = "application/xml"
+	MIMEApplicationXMLCharsetUTF8        = MIMEApplicationXML + "; " + charsetUTF8
+	MIMEApplicationForm                  = "application/x-www-form-urlencoded"
+	MIMEApplicationProtobuf              = "application/protobuf"
+	MIMEApplicationMsgpack               = "application/msgpack"
+	MIMETextHTML                         = "text/html"
+	MIMETextHTMLCharsetUTF8              = MIMETextHTML + "; " + charsetUTF8
+	MIMETextPlain                        = "text/plain"
+	MIMETextPlainCharsetUTF8             = MIMETextPlain + "; " + charsetUTF8
+	MIMEMultipartForm                    = "multipart/form-data"
+	MIMEOctetStream                      = "application/octet-stream"
+)
+
+const (
+	charsetUTF8 = "charset=UTF-8"
+)
+
+// Headers
+const (
+	HeaderAcceptEncoding                = "Accept-Encoding"
+	HeaderAllow                         = "Allow"
+	HeaderAuthorization                 = "Authorization"
+	HeaderContentDisposition            = "Content-Disposition"
+	HeaderContentEncoding               = "Content-Encoding"
+	HeaderContentLength                 = "Content-Length"
+	HeaderContentType                   = "Content-Type"
+	HeaderCookie                        = "Cookie"
+	HeaderSetCookie                     = "Set-Cookie"
+	HeaderIfModifiedSince               = "If-Modified-Since"
+	HeaderLastModified                  = "Last-Modified"
+	HeaderLocation                      = "Location"
+	HeaderUpgrade                       = "Upgrade"
+	HeaderVary                          = "Vary"
+	HeaderWWWAuthenticate               = "WWW-Authenticate"
+	HeaderXForwardedProto               = "X-Forwarded-Proto"
+	HeaderXHTTPMethodOverride           = "X-HTTP-Method-Override"
+	HeaderXForwardedFor                 = "X-Forwarded-For"
+	HeaderXRealIP                       = "X-Real-IP"
+	HeaderServer                        = "Server"
+	HeaderOrigin                        = "Origin"
+	HeaderAccessControlRequestMethod    = "Access-Control-Request-Method"
+	HeaderAccessControlRequestHeaders   = "Access-Control-Request-Headers"
+	HeaderAccessControlAllowOrigin      = "Access-Control-Allow-Origin"
+	HeaderAccessControlAllowMethods     = "Access-Control-Allow-Methods"
+	HeaderAccessControlAllowHeaders     = "Access-Control-Allow-Headers"
+	HeaderAccessControlAllowCredentials = "Access-Control-Allow-Credentials"
+	HeaderAccessControlExposeHeaders    = "Access-Control-Expose-Headers"
+	HeaderAccessControlMaxAge           = "Access-Control-Max-Age"
+
+	// Security
+	HeaderStrictTransportSecurity = "Strict-Transport-Security"
+	HeaderXContentTypeOptions     = "X-Content-Type-Options"
+	HeaderXXSSProtection          = "X-XSS-Protection"
+	HeaderXFrameOptions           = "X-Frame-Options"
+	HeaderContentSecurityPolicy   = "Content-Security-Policy"
+	HeaderXCSRFToken              = "X-CSRF-Token"
+)
+
+var (
+	methods = [...]string{
+		CONNECT,
+		DELETE,
+		GET,
+		HEAD,
+		OPTIONS,
+		PATCH,
+		POST,
+		PUT,
+		TRACE,
+	}
+)
+
+// Errors
+var (
+	ErrUnsupportedMediaType        = NewHTTPError(http.StatusUnsupportedMediaType)
+	ErrNotFound                    = NewHTTPError(http.StatusNotFound)
+	ErrUnauthorized                = NewHTTPError(http.StatusUnauthorized)
+	ErrMethodNotAllowed            = NewHTTPError(http.StatusMethodNotAllowed)
+	ErrStatusRequestEntityTooLarge = NewHTTPError(http.StatusRequestEntityTooLarge)
+	ErrValidatorNotRegistered      = errors.New("Validator not registered")
+	ErrRendererNotRegistered       = errors.New("Renderer not registered")
+	ErrInvalidRedirectCode         = errors.New("Invalid redirect status code")
+	ErrCookieNotFound              = errors.New("Cookie not found")
+)
+
+// Error handlers
+var (
+	NotFoundHandler = func(c Context) error {
+		return ErrNotFound
+	}
+
+	MethodNotAllowedHandler = func(c Context) error {
+		return ErrMethodNotAllowed
+	}
+)
+
+// New creates an instance of Echo.
+func New() (e *Echo) {
+	e = &Echo{
+		Server:    new(http.Server),
+		TLSServer: new(http.Server),
+		AutoTLSManager: autocert.Manager{
+			Prompt: autocert.AcceptTOS,
+		},
+		Logger:   log.New("echo"),
+		colorer:  color.New(),
+		maxParam: new(int),
+	}
+	e.Server.Handler = e
+	e.TLSServer.Handler = e
+	e.HTTPErrorHandler = e.DefaultHTTPErrorHandler
+	e.Binder = &DefaultBinder{}
+	e.Logger.SetLevel(log.OFF)
+	e.stdLogger = slog.New(e.Logger.Output(), e.Logger.Prefix()+": ", 0)
+	e.pool.New = func() interface{} {
+		return e.NewContext(nil, nil)
+	}
+	e.router = NewRouter(e)
+	return
+}
+
+// NewContext returns a Context instance.
+func (e *Echo) NewContext(r *http.Request, w http.ResponseWriter) Context {
+	return &context{
+		request:  r,
+		response: NewResponse(w, e),
+		store:    make(Map),
+		echo:     e,
+		pvalues:  make([]string, *e.maxParam),
+		handler:  NotFoundHandler,
+	}
+}
+
+// Router returns router.
+func (e *Echo) Router() *Router {
+	return e.router
+}
+
+// DefaultHTTPErrorHandler is the default HTTP error handler. It sends a JSON response
+// with status code.
+func (e *Echo) DefaultHTTPErrorHandler(err error, c Context) {
+	var (
+		code = http.StatusInternalServerError
+		msg  interface{}
+	)
+
+	if he, ok := err.(*HTTPError); ok {
+		code = he.Code
+		msg = he.Message
+	} else if e.Debug {
+		msg = err.Error()
+	} else {
+		msg = http.StatusText(code)
+	}
+	if _, ok := msg.(string); ok {
+		msg = Map{"message": msg}
+	}
+
+	if !c.Response().Committed {
+		if c.Request().Method == HEAD { // Issue #608
+			if err := c.NoContent(code); err != nil {
+				goto ERROR
+			}
+		} else {
+			if err := c.JSON(code, msg); err != nil {
+				goto ERROR
+			}
+		}
+	}
+ERROR:
+	e.Logger.Error(err)
+}
+
+// Pre adds middleware to the chain which is run before router.
+func (e *Echo) Pre(middleware ...MiddlewareFunc) {
+	e.premiddleware = append(e.premiddleware, middleware...)
+}
+
+// Use adds middleware to the chain which is run after router.
+func (e *Echo) Use(middleware ...MiddlewareFunc) {
+	e.middleware = append(e.middleware, middleware...)
+}
+
+// CONNECT registers a new CONNECT route for a path with matching handler in the
+// router with optional route-level middleware.
+func (e *Echo) CONNECT(path string, h HandlerFunc, m ...MiddlewareFunc) {
+	e.add(CONNECT, path, h, m...)
+}
+
+// DELETE registers a new DELETE route for a path with matching handler in the router
+// with optional route-level middleware.
+func (e *Echo) DELETE(path string, h HandlerFunc, m ...MiddlewareFunc) {
+	e.add(DELETE, path, h, m...)
+}
+
+// GET registers a new GET route for a path with matching handler in the router
+// with optional route-level middleware.
+func (e *Echo) GET(path string, h HandlerFunc, m ...MiddlewareFunc) {
+	e.add(GET, path, h, m...)
+}
+
+// HEAD registers a new HEAD route for a path with matching handler in the
+// router with optional route-level middleware.
+func (e *Echo) HEAD(path string, h HandlerFunc, m ...MiddlewareFunc) {
+	e.add(HEAD, path, h, m...)
+}
+
+// OPTIONS registers a new OPTIONS route for a path with matching handler in the
+// router with optional route-level middleware.
+func (e *Echo) OPTIONS(path string, h HandlerFunc, m ...MiddlewareFunc) {
+	e.add(OPTIONS, path, h, m...)
+}
+
+// PATCH registers a new PATCH route for a path with matching handler in the
+// router with optional route-level middleware.
+func (e *Echo) PATCH(path string, h HandlerFunc, m ...MiddlewareFunc) {
+	e.add(PATCH, path, h, m...)
+}
+
+// POST registers a new POST route for a path with matching handler in the
+// router with optional route-level middleware.
+func (e *Echo) POST(path string, h HandlerFunc, m ...MiddlewareFunc) {
+	e.add(POST, path, h, m...)
+}
+
+// PUT registers a new PUT route for a path with matching handler in the
+// router with optional route-level middleware.
+func (e *Echo) PUT(path string, h HandlerFunc, m ...MiddlewareFunc) {
+	e.add(PUT, path, h, m...)
+}
+
+// TRACE registers a new TRACE route for a path with matching handler in the
+// router with optional route-level middleware.
+func (e *Echo) TRACE(path string, h HandlerFunc, m ...MiddlewareFunc) {
+	e.add(TRACE, path, h, m...)
+}
+
+// Any registers a new route for all HTTP methods and path with matching handler
+// in the router with optional route-level middleware.
+func (e *Echo) Any(path string, handler HandlerFunc, middleware ...MiddlewareFunc) {
+	for _, m := range methods {
+		e.add(m, path, handler, middleware...)
+	}
+}
+
+// Match registers a new route for multiple HTTP methods and path with matching
+// handler in the router with optional route-level middleware.
+func (e *Echo) Match(methods []string, path string, handler HandlerFunc, middleware ...MiddlewareFunc) {
+	for _, m := range methods {
+		e.add(m, path, handler, middleware...)
+	}
+}
+
+// Static registers a new route with path prefix to serve static files from the
+// provided root directory.
+func (e *Echo) Static(prefix, root string) {
+	static(e, prefix, root)
+}
+
+func static(i i, prefix, root string) {
+	h := func(c Context) error {
+		return c.File(path.Join(root, c.Param("*")))
+	}
+	i.GET(prefix, h)
+	if prefix == "/" {
+		i.GET(prefix+"*", h)
+	} else {
+		i.GET(prefix+"/*", h)
+	}
+}
+
+// File registers a new route with path to serve a static file.
+func (e *Echo) File(path, file string) {
+	e.GET(path, func(c Context) error {
+		return c.File(file)
+	})
+}
+
+func (e *Echo) add(method, path string, handler HandlerFunc, middleware ...MiddlewareFunc) {
+	name := handlerName(handler)
+	e.router.Add(method, path, func(c Context) error {
+		h := handler
+		// Chain middleware
+		for i := len(middleware) - 1; i >= 0; i-- {
+			h = middleware[i](h)
+		}
+		return h(c)
+	})
+	r := Route{
+		Method:  method,
+		Path:    path,
+		Handler: name,
+	}
+	e.router.routes[method+path] = r
+}
+
+// Group creates a new router group with prefix and optional group-level middleware.
+func (e *Echo) Group(prefix string, m ...MiddlewareFunc) (g *Group) {
+	g = &Group{prefix: prefix, echo: e}
+	g.Use(m...)
+	return
+}
+
+// URI generates a URI from handler.
+func (e *Echo) URI(handler HandlerFunc, params ...interface{}) string {
+	uri := new(bytes.Buffer)
+	ln := len(params)
+	n := 0
+	name := handlerName(handler)
+	for _, r := range e.router.routes {
+		if r.Handler == name {
+			for i, l := 0, len(r.Path); i < l; i++ {
+				if r.Path[i] == ':' && n < ln {
+					for ; i < l && r.Path[i] != '/'; i++ {
+					}
+					uri.WriteString(fmt.Sprintf("%v", params[n]))
+					n++
+				}
+				if i < l {
+					uri.WriteByte(r.Path[i])
+				}
+			}
+			break
+		}
+	}
+	return uri.String()
+}
+
+// URL is an alias for `URI` function.
+func (e *Echo) URL(h HandlerFunc, params ...interface{}) string {
+	return e.URI(h, params...)
+}
+
+// Routes returns the registered routes.
+func (e *Echo) Routes() []Route {
+	routes := []Route{}
+	for _, v := range e.router.routes {
+		routes = append(routes, v)
+	}
+	return routes
+}
+
+// AcquireContext returns an empty `Context` instance from the pool.
+// You must return the context by calling `ReleaseContext()`.
+func (e *Echo) AcquireContext() Context {
+	return e.pool.Get().(Context)
+}
+
+// ReleaseContext returns the `Context` instance back to the pool.
+// You must call it after `AcquireContext()`.
+func (e *Echo) ReleaseContext(c Context) {
+	e.pool.Put(c)
+}
+
+// ServeHTTP implements `http.Handler` interface, which serves HTTP requests.
+func (e *Echo) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	// Acquire lock
+	e.Mutex.RLock()
+	defer e.Mutex.RUnlock()
+
+	// Acquire context
+	c := e.pool.Get().(*context)
+	defer e.pool.Put(c)
+	c.Reset(r, w)
+
+	// Middleware
+	h := func(c Context) error {
+		method := r.Method
+		path := r.URL.EscapedPath()
+		e.router.Find(method, path, c)
+		h := c.Handler()
+		for i := len(e.middleware) - 1; i >= 0; i-- {
+			h = e.middleware[i](h)
+		}
+		return h(c)
+	}
+
+	// Premiddleware
+	for i := len(e.premiddleware) - 1; i >= 0; i-- {
+		h = e.premiddleware[i](h)
+	}
+
+	// Execute chain
+	if err := h(c); err != nil {
+		e.HTTPErrorHandler(err, c)
+	}
+}
+
+// Start starts an HTTP server.
+func (e *Echo) Start(address string) error {
+	e.Server.Addr = address
+	return e.StartServer(e.Server)
+}
+
+// StartTLS starts an HTTPS server.
+func (e *Echo) StartTLS(address string, certFile, keyFile string) (err error) {
+	if certFile == "" || keyFile == "" {
+		return errors.New("invalid tls configuration")
+	}
+	s := e.TLSServer
+	s.TLSConfig = new(tls.Config)
+	s.TLSConfig.Certificates = make([]tls.Certificate, 1)
+	s.TLSConfig.Certificates[0], err = tls.LoadX509KeyPair(certFile, keyFile)
+	if err != nil {
+		return
+	}
+	return e.startTLS(address)
+}
+
+// StartAutoTLS starts an HTTPS server using certificates automatically installed from https://letsencrypt.org.
+func (e *Echo) StartAutoTLS(address string) error {
+	s := e.TLSServer
+	s.TLSConfig = new(tls.Config)
+	s.TLSConfig.GetCertificate = e.AutoTLSManager.GetCertificate
+	return e.startTLS(address)
+}
+
+func (e *Echo) startTLS(address string) error {
+	s := e.TLSServer
+	s.Addr = address
+	if !e.DisableHTTP2 {
+		s.TLSConfig.NextProtos = append(s.TLSConfig.NextProtos, "h2")
+	}
+	return e.StartServer(e.TLSServer)
+}
+
+// StartServer starts a custom http server.
+func (e *Echo) StartServer(s *http.Server) (err error) {
+	// Setup
+	e.colorer.SetOutput(e.Logger.Output())
+	s.Handler = e
+	s.ErrorLog = e.stdLogger
+
+	if s.TLSConfig == nil {
+		if e.Listener == nil {
+			e.Listener, err = newListener(s.Addr)
+			if err != nil {
+				return err
+			}
+		}
+		e.colorer.Printf("⇛ http server started on %s\n", e.colorer.Green(e.Listener.Addr()))
+		return s.Serve(e.Listener)
+	}
+	if e.TLSListener == nil {
+		l, err := newListener(s.Addr)
+		if err != nil {
+			return err
+		}
+		e.TLSListener = tls.NewListener(l, s.TLSConfig)
+	}
+	e.colorer.Printf("⇛ https server started on %s\n", e.colorer.Green(e.TLSListener.Addr()))
+	return s.Serve(e.TLSListener)
+}
+
+// NewHTTPError creates a new HTTPError instance.
+func NewHTTPError(code int, message ...interface{}) *HTTPError {
+	he := &HTTPError{Code: code, Message: http.StatusText(code)}
+	if len(message) > 0 {
+		he.Message = message[0]
+	}
+	return he
+}
+
+// Error makes it compatible with `error` interface.
+func (he *HTTPError) Error() string {
+	return fmt.Sprintf("code=%d, message=%s", he.Code, he.Message)
+}
+
+// WrapHandler wraps `http.Handler` into `echo.HandlerFunc`.
+func WrapHandler(h http.Handler) HandlerFunc {
+	return func(c Context) error {
+		h.ServeHTTP(c.Response(), c.Request())
+		return nil
+	}
+}
+
+// WrapMiddleware wraps `func(http.Handler) http.Handler` into `echo.MiddlewareFunc`
+func WrapMiddleware(m func(http.Handler) http.Handler) MiddlewareFunc {
+	return func(next HandlerFunc) HandlerFunc {
+		return func(c Context) (err error) {
+			m(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+				c.SetRequest(r)
+				err = next(c)
+			})).ServeHTTP(c.Response(), c.Request())
+			return
+		}
+	}
+}
+
+func handlerName(h HandlerFunc) string {
+	t := reflect.ValueOf(h).Type()
+	if t.Kind() == reflect.Func {
+		return runtime.FuncForPC(reflect.ValueOf(h).Pointer()).Name()
+	}
+	return t.String()
+}
+
+// tcpKeepAliveListener sets TCP keep-alive timeouts on accepted
+// connections. It's used by ListenAndServe and ListenAndServeTLS so
+// dead TCP connections (e.g. closing laptop mid-download) eventually
+// go away.
+type tcpKeepAliveListener struct {
+	*net.TCPListener
+}
+
+func (ln tcpKeepAliveListener) Accept() (c net.Conn, err error) {
+	tc, err := ln.AcceptTCP()
+	if err != nil {
+		return
+	}
+	tc.SetKeepAlive(true)
+	tc.SetKeepAlivePeriod(3 * time.Minute)
+	return tc, nil
+}
+
+func newListener(address string) (*tcpKeepAliveListener, error) {
+	l, err := net.Listen("tcp", address)
+	if err != nil {
+		return nil, err
+	}
+	return &tcpKeepAliveListener{l.(*net.TCPListener)}, nil
+}

vendor/github.com/labstack/echo/group.go

@@ -0,0 +1,104 @@
+package echo
+
+type (
+	// Group is a set of sub-routes for a specified route. It can be used for inner
+	// routes that share a common middlware or functionality that should be separate
+	// from the parent echo instance while still inheriting from it.
+	Group struct {
+		prefix     string
+		middleware []MiddlewareFunc
+		echo       *Echo
+	}
+)
+
+// Use implements `Echo#Use()` for sub-routes within the Group.
+func (g *Group) Use(middleware ...MiddlewareFunc) {
+	g.middleware = append(g.middleware, middleware...)
+}
+
+// CONNECT implements `Echo#CONNECT()` for sub-routes within the Group.
+func (g *Group) CONNECT(path string, h HandlerFunc, m ...MiddlewareFunc) {
+	g.add(CONNECT, path, h, m...)
+}
+
+// DELETE implements `Echo#DELETE()` for sub-routes within the Group.
+func (g *Group) DELETE(path string, h HandlerFunc, m ...MiddlewareFunc) {
+	g.add(DELETE, path, h, m...)
+}
+
+// GET implements `Echo#GET()` for sub-routes within the Group.
+func (g *Group) GET(path string, h HandlerFunc, m ...MiddlewareFunc) {
+	g.add(GET, path, h, m...)
+}
+
+// HEAD implements `Echo#HEAD()` for sub-routes within the Group.
+func (g *Group) HEAD(path string, h HandlerFunc, m ...MiddlewareFunc) {
+	g.add(HEAD, path, h, m...)
+}
+
+// OPTIONS implements `Echo#OPTIONS()` for sub-routes within the Group.
+func (g *Group) OPTIONS(path string, h HandlerFunc, m ...MiddlewareFunc) {
+	g.add(OPTIONS, path, h, m...)
+}
+
+// PATCH implements `Echo#PATCH()` for sub-routes within the Group.
+func (g *Group) PATCH(path string, h HandlerFunc, m ...MiddlewareFunc) {
+	g.add(PATCH, path, h, m...)
+}
+
+// POST implements `Echo#POST()` for sub-routes within the Group.
+func (g *Group) POST(path string, h HandlerFunc, m ...MiddlewareFunc) {
+	g.add(POST, path, h, m...)
+}
+
+// PUT implements `Echo#PUT()` for sub-routes within the Group.
+func (g *Group) PUT(path string, h HandlerFunc, m ...MiddlewareFunc) {
+	g.add(PUT, path, h, m...)
+}
+
+// TRACE implements `Echo#TRACE()` for sub-routes within the Group.
+func (g *Group) TRACE(path string, h HandlerFunc, m ...MiddlewareFunc) {
+	g.add(TRACE, path, h, m...)
+}
+
+// Any implements `Echo#Any()` for sub-routes within the Group.
+func (g *Group) Any(path string, handler HandlerFunc, middleware ...MiddlewareFunc) {
+	for _, m := range methods {
+		g.add(m, path, handler, middleware...)
+	}
+}
+
+// Match implements `Echo#Match()` for sub-routes within the Group.
+func (g *Group) Match(methods []string, path string, handler HandlerFunc, middleware ...MiddlewareFunc) {
+	for _, m := range methods {
+		g.add(m, path, handler, middleware...)
+	}
+}
+
+// Group creates a new sub-group with prefix and optional sub-group-level middleware.
+func (g *Group) Group(prefix string, middleware ...MiddlewareFunc) *Group {
+	m := []MiddlewareFunc{}
+	m = append(m, g.middleware...)
+	m = append(m, middleware...)
+	return g.echo.Group(g.prefix+prefix, m...)
+}
+
+// Static implements `Echo#Static()` for sub-routes within the Group.
+func (g *Group) Static(prefix, root string) {
+	static(g, prefix, root)
+}
+
+// File implements `Echo#File()` for sub-routes within the Group.
+func (g *Group) File(path, file string) {
+	g.echo.File(g.prefix+path, file)
+}
+
+func (g *Group) add(method, path string, handler HandlerFunc, middleware ...MiddlewareFunc) {
+	// Combine into a new slice to avoid accidentally passing the same slice for
+	// multiple routes, which would lead to later add() calls overwriting the
+	// middleware from earlier calls.
+	m := []MiddlewareFunc{}
+	m = append(m, g.middleware...)
+	m = append(m, middleware...)
+	g.echo.add(method, g.prefix+path, handler, m...)
+}

vendor/github.com/labstack/echo/log.go

@@ -0,0 +1,40 @@
+package echo
+
+import (
+	"io"
+
+	"github.com/labstack/gommon/log"
+)
+
+type (
+	// Logger defines the logging interface.
+	Logger interface {
+		Output() io.Writer
+		SetOutput(w io.Writer)
+		Prefix() string
+		SetPrefix(p string)
+		Level() log.Lvl
+		SetLevel(v log.Lvl)
+		Print(i ...interface{})
+		Printf(format string, args ...interface{})
+		Printj(j log.JSON)
+		Debug(i ...interface{})
+		Debugf(format string, args ...interface{})
+		Debugj(j log.JSON)
+		Info(i ...interface{})
+		Infof(format string, args ...interface{})
+		Infoj(j log.JSON)
+		Warn(i ...interface{})
+		Warnf(format string, args ...interface{})
+		Warnj(j log.JSON)
+		Error(i ...interface{})
+		Errorf(format string, args ...interface{})
+		Errorj(j log.JSON)
+		Fatal(i ...interface{})
+		Fatalj(j log.JSON)
+		Fatalf(format string, args ...interface{})
+		Panic(i ...interface{})
+		Panicj(j log.JSON)
+		Panicf(format string, args ...interface{})
+	}
+)

vendor/github.com/labstack/echo/middleware/basic_auth.go

@@ -0,0 +1,86 @@
+package middleware
+
+import (
+	"encoding/base64"
+
+	"github.com/labstack/echo"
+)
+
+type (
+	// BasicAuthConfig defines the config for BasicAuth middleware.
+	BasicAuthConfig struct {
+		// Skipper defines a function to skip middleware.
+		Skipper Skipper
+
+		// Validator is a function to validate BasicAuth credentials.
+		// Required.
+		Validator BasicAuthValidator
+	}
+
+	// BasicAuthValidator defines a function to validate BasicAuth credentials.
+	BasicAuthValidator func(string, string, echo.Context) bool
+)
+
+const (
+	basic = "Basic"
+)
+
+var (
+	// DefaultBasicAuthConfig is the default BasicAuth middleware config.
+	DefaultBasicAuthConfig = BasicAuthConfig{
+		Skipper: DefaultSkipper,
+	}
+)
+
+// BasicAuth returns an BasicAuth middleware.
+//
+// For valid credentials it calls the next handler.
+// For missing or invalid credentials, it sends "401 - Unauthorized" response.
+func BasicAuth(fn BasicAuthValidator) echo.MiddlewareFunc {
+	c := DefaultBasicAuthConfig
+	c.Validator = fn
+	return BasicAuthWithConfig(c)
+}
+
+// BasicAuthWithConfig returns an BasicAuth middleware with config.
+// See `BasicAuth()`.
+func BasicAuthWithConfig(config BasicAuthConfig) echo.MiddlewareFunc {
+	// Defaults
+	if config.Validator == nil {
+		panic("basic-auth middleware requires a validator function")
+	}
+	if config.Skipper == nil {
+		config.Skipper = DefaultBasicAuthConfig.Skipper
+	}
+
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			if config.Skipper(c) {
+				return next(c)
+			}
+
+			auth := c.Request().Header.Get(echo.HeaderAuthorization)
+			l := len(basic)
+
+			if len(auth) > l+1 && auth[:l] == basic {
+				b, err := base64.StdEncoding.DecodeString(auth[l+1:])
+				if err != nil {
+					return err
+				}
+				cred := string(b)
+				for i := 0; i < len(cred); i++ {
+					if cred[i] == ':' {
+						// Verify credentials
+						if config.Validator(cred[:i], cred[i+1:], c) {
+							return next(c)
+						}
+					}
+				}
+			}
+
+			// Need to return `401` for browsers to pop-up login box.
+			c.Response().Header().Set(echo.HeaderWWWAuthenticate, basic+" realm=Restricted")
+			return echo.ErrUnauthorized
+		}
+	}
+}

vendor/github.com/labstack/echo/middleware/body_limit.go

@@ -0,0 +1,116 @@
+package middleware
+
+import (
+	"fmt"
+	"io"
+	"sync"
+
+	"github.com/labstack/echo"
+	"github.com/labstack/gommon/bytes"
+)
+
+type (
+	// BodyLimitConfig defines the config for BodyLimit middleware.
+	BodyLimitConfig struct {
+		// Skipper defines a function to skip middleware.
+		Skipper Skipper
+
+		// Maximum allowed size for a request body, it can be specified
+		// as `4x` or `4xB`, where x is one of the multiple from K, M, G, T or P.
+		Limit string `json:"limit"`
+		limit int64
+	}
+
+	limitedReader struct {
+		BodyLimitConfig
+		reader  io.ReadCloser
+		read    int64
+		context echo.Context
+	}
+)
+
+var (
+	// DefaultBodyLimitConfig is the default Gzip middleware config.
+	DefaultBodyLimitConfig = BodyLimitConfig{
+		Skipper: DefaultSkipper,
+	}
+)
+
+// BodyLimit returns a BodyLimit middleware.
+//
+// BodyLimit middleware sets the maximum allowed size for a request body, if the
+// size exceeds the configured limit, it sends "413 - Request Entity Too Large"
+// response. The BodyLimit is determined based on both `Content-Length` request
+// header and actual content read, which makes it super secure.
+// Limit can be specified as `4x` or `4xB`, where x is one of the multiple from K, M,
+// G, T or P.
+func BodyLimit(limit string) echo.MiddlewareFunc {
+	c := DefaultBodyLimitConfig
+	c.Limit = limit
+	return BodyLimitWithConfig(c)
+}
+
+// BodyLimitWithConfig returns a BodyLimit middleware with config.
+// See: `BodyLimit()`.
+func BodyLimitWithConfig(config BodyLimitConfig) echo.MiddlewareFunc {
+	// Defaults
+	if config.Skipper == nil {
+		config.Skipper = DefaultBodyLimitConfig.Skipper
+	}
+
+	limit, err := bytes.Parse(config.Limit)
+	if err != nil {
+		panic(fmt.Errorf("invalid body-limit=%s", config.Limit))
+	}
+	config.limit = limit
+	pool := limitedReaderPool(config)
+
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			if config.Skipper(c) {
+				return next(c)
+			}
+
+			req := c.Request()
+
+			// Based on content length
+			if req.ContentLength > config.limit {
+				return echo.ErrStatusRequestEntityTooLarge
+			}
+
+			// Based on content read
+			r := pool.Get().(*limitedReader)
+			r.Reset(req.Body, c)
+			defer pool.Put(r)
+			req.Body = r
+
+			return next(c)
+		}
+	}
+}
+
+func (r *limitedReader) Read(b []byte) (n int, err error) {
+	n, err = r.reader.Read(b)
+	r.read += int64(n)
+	if r.read > r.limit {
+		return n, echo.ErrStatusRequestEntityTooLarge
+	}
+	return
+}
+
+func (r *limitedReader) Close() error {
+	return r.reader.Close()
+}
+
+func (r *limitedReader) Reset(reader io.ReadCloser, context echo.Context) {
+	r.reader = reader
+	r.context = context
+}
+
+func limitedReaderPool(c BodyLimitConfig) sync.Pool {
+	return sync.Pool{
+		New: func() interface{} {
+			return &limitedReader{BodyLimitConfig: c}
+		},
+	}
+}

vendor/github.com/labstack/echo/middleware/compress.go

@@ -0,0 +1,121 @@
+package middleware
+
+import (
+	"bufio"
+	"compress/gzip"
+	"io"
+	"io/ioutil"
+	"net"
+	"net/http"
+	"strings"
+
+	"github.com/labstack/echo"
+)
+
+type (
+	// GzipConfig defines the config for Gzip middleware.
+	GzipConfig struct {
+		// Skipper defines a function to skip middleware.
+		Skipper Skipper
+
+		// Gzip compression level.
+		// Optional. Default value -1.
+		Level int `json:"level"`
+	}
+
+	gzipResponseWriter struct {
+		io.Writer
+		http.ResponseWriter
+	}
+)
+
+const (
+	gzipScheme = "gzip"
+)
+
+var (
+	// DefaultGzipConfig is the default Gzip middleware config.
+	DefaultGzipConfig = GzipConfig{
+		Skipper: DefaultSkipper,
+		Level:   -1,
+	}
+)
+
+// Gzip returns a middleware which compresses HTTP response using gzip compression
+// scheme.
+func Gzip() echo.MiddlewareFunc {
+	return GzipWithConfig(DefaultGzipConfig)
+}
+
+// GzipWithConfig return Gzip middleware with config.
+// See: `Gzip()`.
+func GzipWithConfig(config GzipConfig) echo.MiddlewareFunc {
+	// Defaults
+	if config.Skipper == nil {
+		config.Skipper = DefaultGzipConfig.Skipper
+	}
+	if config.Level == 0 {
+		config.Level = DefaultGzipConfig.Level
+	}
+
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			if config.Skipper(c) {
+				return next(c)
+			}
+
+			res := c.Response()
+			res.Header().Add(echo.HeaderVary, echo.HeaderAcceptEncoding)
+			if strings.Contains(c.Request().Header.Get(echo.HeaderAcceptEncoding), gzipScheme) {
+				res.Header().Add(echo.HeaderContentEncoding, gzipScheme) // Issue #806
+				rw := res.Writer
+				w, err := gzip.NewWriterLevel(rw, config.Level)
+				if err != nil {
+					return err
+				}
+				defer func() {
+					if res.Size == 0 {
+						if res.Header().Get(echo.HeaderContentEncoding) == gzipScheme {
+							res.Header().Del(echo.HeaderContentEncoding)
+						}
+						// We have to reset response to it's pristine state when
+						// nothing is written to body or error is returned.
+						// See issue #424, #407.
+						res.Writer = rw
+						w.Reset(ioutil.Discard)
+					}
+					w.Close()
+				}()
+				grw := &gzipResponseWriter{Writer: w, ResponseWriter: rw}
+				res.Writer = grw
+			}
+			return next(c)
+		}
+	}
+}
+
+func (w *gzipResponseWriter) WriteHeader(code int) {
+	if code == http.StatusNoContent { // Issue #489
+		w.ResponseWriter.Header().Del(echo.HeaderContentEncoding)
+	}
+	w.ResponseWriter.WriteHeader(code)
+}
+
+func (w *gzipResponseWriter) Write(b []byte) (int, error) {
+	if w.Header().Get(echo.HeaderContentType) == "" {
+		w.Header().Set(echo.HeaderContentType, http.DetectContentType(b))
+	}
+	return w.Writer.Write(b)
+}
+
+func (w *gzipResponseWriter) Flush() error {
+	return w.Writer.(*gzip.Writer).Flush()
+}
+
+func (w *gzipResponseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
+	return w.ResponseWriter.(http.Hijacker).Hijack()
+}
+
+func (w *gzipResponseWriter) CloseNotify() <-chan bool {
+	return w.ResponseWriter.(http.CloseNotifier).CloseNotify()
+}

vendor/github.com/labstack/echo/middleware/cors.go

@@ -0,0 +1,139 @@
+package middleware
+
+import (
+	"net/http"
+	"strconv"
+	"strings"
+
+	"github.com/labstack/echo"
+)
+
+type (
+	// CORSConfig defines the config for CORS middleware.
+	CORSConfig struct {
+		// Skipper defines a function to skip middleware.
+		Skipper Skipper
+
+		// AllowOrigin defines a list of origins that may access the resource.
+		// Optional. Default value []string{"*"}.
+		AllowOrigins []string `json:"allow_origins"`
+
+		// AllowMethods defines a list methods allowed when accessing the resource.
+		// This is used in response to a preflight request.
+		// Optional. Default value DefaultCORSConfig.AllowMethods.
+		AllowMethods []string `json:"allow_methods"`
+
+		// AllowHeaders defines a list of request headers that can be used when
+		// making the actual request. This in response to a preflight request.
+		// Optional. Default value []string{}.
+		AllowHeaders []string `json:"allow_headers"`
+
+		// AllowCredentials indicates whether or not the response to the request
+		// can be exposed when the credentials flag is true. When used as part of
+		// a response to a preflight request, this indicates whether or not the
+		// actual request can be made using credentials.
+		// Optional. Default value false.
+		AllowCredentials bool `json:"allow_credentials"`
+
+		// ExposeHeaders defines a whitelist headers that clients are allowed to
+		// access.
+		// Optional. Default value []string{}.
+		ExposeHeaders []string `json:"expose_headers"`
+
+		// MaxAge indicates how long (in seconds) the results of a preflight request
+		// can be cached.
+		// Optional. Default value 0.
+		MaxAge int `json:"max_age"`
+	}
+)
+
+var (
+	// DefaultCORSConfig is the default CORS middleware config.
+	DefaultCORSConfig = CORSConfig{
+		Skipper:      DefaultSkipper,
+		AllowOrigins: []string{"*"},
+		AllowMethods: []string{echo.GET, echo.HEAD, echo.PUT, echo.PATCH, echo.POST, echo.DELETE},
+	}
+)
+
+// CORS returns a Cross-Origin Resource Sharing (CORS) middleware.
+// See: https://developer.mozilla.org/en/docs/Web/HTTP/Access_control_CORS
+func CORS() echo.MiddlewareFunc {
+	return CORSWithConfig(DefaultCORSConfig)
+}
+
+// CORSWithConfig returns a CORS middleware with config.
+// See: `CORS()`.
+func CORSWithConfig(config CORSConfig) echo.MiddlewareFunc {
+	// Defaults
+	if config.Skipper == nil {
+		config.Skipper = DefaultCORSConfig.Skipper
+	}
+	if len(config.AllowOrigins) == 0 {
+		config.AllowOrigins = DefaultCORSConfig.AllowOrigins
+	}
+	if len(config.AllowMethods) == 0 {
+		config.AllowMethods = DefaultCORSConfig.AllowMethods
+	}
+
+	allowMethods := strings.Join(config.AllowMethods, ",")
+	allowHeaders := strings.Join(config.AllowHeaders, ",")
+	exposeHeaders := strings.Join(config.ExposeHeaders, ",")
+	maxAge := strconv.Itoa(config.MaxAge)
+
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			if config.Skipper(c) {
+				return next(c)
+			}
+
+			req := c.Request()
+			res := c.Response()
+			origin := req.Header.Get(echo.HeaderOrigin)
+			allowOrigin := ""
+
+			// Check allowed origins
+			for _, o := range config.AllowOrigins {
+				if o == "*" || o == origin {
+					allowOrigin = o
+					break
+				}
+			}
+
+			// Simple request
+			if req.Method != echo.OPTIONS {
+				res.Header().Add(echo.HeaderVary, echo.HeaderOrigin)
+				res.Header().Set(echo.HeaderAccessControlAllowOrigin, allowOrigin)
+				if config.AllowCredentials {
+					res.Header().Set(echo.HeaderAccessControlAllowCredentials, "true")
+				}
+				if exposeHeaders != "" {
+					res.Header().Set(echo.HeaderAccessControlExposeHeaders, exposeHeaders)
+				}
+				return next(c)
+			}
+
+			// Preflight request
+			res.Header().Add(echo.HeaderVary, echo.HeaderOrigin)
+			res.Header().Add(echo.HeaderVary, echo.HeaderAccessControlRequestMethod)
+			res.Header().Add(echo.HeaderVary, echo.HeaderAccessControlRequestHeaders)
+			res.Header().Set(echo.HeaderAccessControlAllowOrigin, allowOrigin)
+			res.Header().Set(echo.HeaderAccessControlAllowMethods, allowMethods)
+			if config.AllowCredentials {
+				res.Header().Set(echo.HeaderAccessControlAllowCredentials, "true")
+			}
+			if allowHeaders != "" {
+				res.Header().Set(echo.HeaderAccessControlAllowHeaders, allowHeaders)
+			} else {
+				h := req.Header.Get(echo.HeaderAccessControlRequestHeaders)
+				if h != "" {
+					res.Header().Set(echo.HeaderAccessControlAllowHeaders, h)
+				}
+			}
+			if config.MaxAge > 0 {
+				res.Header().Set(echo.HeaderAccessControlMaxAge, maxAge)
+			}
+			return c.NoContent(http.StatusNoContent)
+		}
+	}
+}

vendor/github.com/labstack/echo/middleware/csrf.go

@@ -0,0 +1,210 @@
+package middleware
+
+import (
+	"crypto/subtle"
+	"errors"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/labstack/echo"
+	"github.com/labstack/gommon/random"
+)
+
+type (
+	// CSRFConfig defines the config for CSRF middleware.
+	CSRFConfig struct {
+		// Skipper defines a function to skip middleware.
+		Skipper Skipper
+
+		// TokenLength is the length of the generated token.
+		TokenLength uint8 `json:"token_length"`
+		// Optional. Default value 32.
+
+		// TokenLookup is a string in the form of "<source>:<key>" that is used
+		// to extract token from the request.
+		// Optional. Default value "header:X-CSRF-Token".
+		// Possible values:
+		// - "header:<name>"
+		// - "form:<name>"
+		// - "query:<name>"
+		TokenLookup string `json:"token_lookup"`
+
+		// Context key to store generated CSRF token into context.
+		// Optional. Default value "csrf".
+		ContextKey string `json:"context_key"`
+
+		// Name of the CSRF cookie. This cookie will store CSRF token.
+		// Optional. Default value "csrf".
+		CookieName string `json:"cookie_name"`
+
+		// Domain of the CSRF cookie.
+		// Optional. Default value none.
+		CookieDomain string `json:"cookie_domain"`
+
+		// Path of the CSRF cookie.
+		// Optional. Default value none.
+		CookiePath string `json:"cookie_path"`
+
+		// Max age (in seconds) of the CSRF cookie.
+		// Optional. Default value 86400 (24hr).
+		CookieMaxAge int `json:"cookie_max_age"`
+
+		// Indicates if CSRF cookie is secure.
+		// Optional. Default value false.
+		CookieSecure bool `json:"cookie_secure"`
+
+		// Indicates if CSRF cookie is HTTP only.
+		// Optional. Default value false.
+		CookieHTTPOnly bool `json:"cookie_http_only"`
+	}
+
+	// csrfTokenExtractor defines a function that takes `echo.Context` and returns
+	// either a token or an error.
+	csrfTokenExtractor func(echo.Context) (string, error)
+)
+
+var (
+	// DefaultCSRFConfig is the default CSRF middleware config.
+	DefaultCSRFConfig = CSRFConfig{
+		Skipper:      DefaultSkipper,
+		TokenLength:  32,
+		TokenLookup:  "header:" + echo.HeaderXCSRFToken,
+		ContextKey:   "csrf",
+		CookieName:   "_csrf",
+		CookieMaxAge: 86400,
+	}
+)
+
+// CSRF returns a Cross-Site Request Forgery (CSRF) middleware.
+// See: https://en.wikipedia.org/wiki/Cross-site_request_forgery
+func CSRF() echo.MiddlewareFunc {
+	c := DefaultCSRFConfig
+	return CSRFWithConfig(c)
+}
+
+// CSRFWithConfig returns a CSRF middleware with config.
+// See `CSRF()`.
+func CSRFWithConfig(config CSRFConfig) echo.MiddlewareFunc {
+	// Defaults
+	if config.Skipper == nil {
+		config.Skipper = DefaultCSRFConfig.Skipper
+	}
+	if config.TokenLength == 0 {
+		config.TokenLength = DefaultCSRFConfig.TokenLength
+	}
+	if config.TokenLookup == "" {
+		config.TokenLookup = DefaultCSRFConfig.TokenLookup
+	}
+	if config.ContextKey == "" {
+		config.ContextKey = DefaultCSRFConfig.ContextKey
+	}
+	if config.CookieName == "" {
+		config.CookieName = DefaultCSRFConfig.CookieName
+	}
+	if config.CookieMaxAge == 0 {
+		config.CookieMaxAge = DefaultCSRFConfig.CookieMaxAge
+	}
+
+	// Initialize
+	parts := strings.Split(config.TokenLookup, ":")
+	extractor := csrfTokenFromHeader(parts[1])
+	switch parts[0] {
+	case "form":
+		extractor = csrfTokenFromForm(parts[1])
+	case "query":
+		extractor = csrfTokenFromQuery(parts[1])
+	}
+
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			if config.Skipper(c) {
+				return next(c)
+			}
+
+			req := c.Request()
+			k, err := c.Cookie(config.CookieName)
+			token := ""
+
+			if err != nil {
+				// Generate token
+				token = random.String(config.TokenLength)
+			} else {
+				// Reuse token
+				token = k.Value
+			}
+
+			switch req.Method {
+			case echo.GET, echo.HEAD, echo.OPTIONS, echo.TRACE:
+			default:
+				// Validate token only for requests which are not defined as 'safe' by RFC7231
+				clientToken, err := extractor(c)
+				if err != nil {
+					return echo.NewHTTPError(http.StatusBadRequest, err.Error())
+				}
+				if !validateCSRFToken(token, clientToken) {
+					return echo.NewHTTPError(http.StatusForbidden, "Invalid csrf token")
+				}
+			}
+
+			// Set CSRF cookie
+			cookie := new(http.Cookie)
+			cookie.Name = config.CookieName
+			cookie.Value = token
+			if config.CookiePath != "" {
+				cookie.Path = config.CookiePath
+			}
+			if config.CookieDomain != "" {
+				cookie.Domain = config.CookieDomain
+			}
+			cookie.Expires = time.Now().Add(time.Duration(config.CookieMaxAge) * time.Second)
+			cookie.Secure = config.CookieSecure
+			cookie.HttpOnly = config.CookieHTTPOnly
+			c.SetCookie(cookie)
+
+			// Store token in the context
+			c.Set(config.ContextKey, token)
+
+			// Protect clients from caching the response
+			c.Response().Header().Add(echo.HeaderVary, echo.HeaderCookie)
+
+			return next(c)
+		}
+	}
+}
+
+// csrfTokenFromForm returns a `csrfTokenExtractor` that extracts token from the
+// provided request header.
+func csrfTokenFromHeader(header string) csrfTokenExtractor {
+	return func(c echo.Context) (string, error) {
+		return c.Request().Header.Get(header), nil
+	}
+}
+
+// csrfTokenFromForm returns a `csrfTokenExtractor` that extracts token from the
+// provided form parameter.
+func csrfTokenFromForm(param string) csrfTokenExtractor {
+	return func(c echo.Context) (string, error) {
+		token := c.FormValue(param)
+		if token == "" {
+			return "", errors.New("Missing csrf token in the form parameter")
+		}
+		return token, nil
+	}
+}
+
+// csrfTokenFromQuery returns a `csrfTokenExtractor` that extracts token from the
+// provided query parameter.
+func csrfTokenFromQuery(param string) csrfTokenExtractor {
+	return func(c echo.Context) (string, error) {
+		token := c.QueryParam(param)
+		if token == "" {
+			return "", errors.New("Missing csrf token in the query string")
+		}
+		return token, nil
+	}
+}
+
+func validateCSRFToken(token, clientToken string) bool {
+	return subtle.ConstantTimeCompare([]byte(token), []byte(clientToken)) == 1
+}

vendor/github.com/labstack/echo/middleware/jwt.go

@@ -0,0 +1,189 @@
+package middleware
+
+import (
+	"errors"
+	"fmt"
+	"net/http"
+	"reflect"
+	"strings"
+
+	"github.com/dgrijalva/jwt-go"
+	"github.com/labstack/echo"
+)
+
+type (
+	// JWTConfig defines the config for JWT middleware.
+	JWTConfig struct {
+		// Skipper defines a function to skip middleware.
+		Skipper Skipper
+
+		// Signing key to validate token.
+		// Required.
+		SigningKey interface{}
+
+		// Signing method, used to check token signing method.
+		// Optional. Default value HS256.
+		SigningMethod string
+
+		// Context key to store user information from the token into context.
+		// Optional. Default value "user".
+		ContextKey string
+
+		// Claims are extendable claims data defining token content.
+		// Optional. Default value jwt.MapClaims
+		Claims jwt.Claims
+
+		// TokenLookup is a string in the form of "<source>:<name>" that is used
+		// to extract token from the request.
+		// Optional. Default value "header:Authorization".
+		// Possible values:
+		// - "header:<name>"
+		// - "query:<name>"
+		// - "cookie:<name>"
+		TokenLookup string
+
+		// AuthScheme to be used in the Authorization header.
+		// Optional. Default value "Bearer".
+		AuthScheme string
+
+		keyFunc jwt.Keyfunc
+	}
+
+	jwtExtractor func(echo.Context) (string, error)
+)
+
+// Algorithms
+const (
+	AlgorithmHS256 = "HS256"
+)
+
+var (
+	// DefaultJWTConfig is the default JWT auth middleware config.
+	DefaultJWTConfig = JWTConfig{
+		Skipper:       DefaultSkipper,
+		SigningMethod: AlgorithmHS256,
+		ContextKey:    "user",
+		TokenLookup:   "header:" + echo.HeaderAuthorization,
+		AuthScheme:    "Bearer",
+		Claims:        jwt.MapClaims{},
+	}
+)
+
+// JWT returns a JSON Web Token (JWT) auth middleware.
+//
+// For valid token, it sets the user in context and calls next handler.
+// For invalid token, it returns "401 - Unauthorized" error.
+// For missing token, it returns "400 - Bad Request" error.
+//
+// See: https://jwt.io/introduction
+// See `JWTConfig.TokenLookup`
+func JWT(key []byte) echo.MiddlewareFunc {
+	c := DefaultJWTConfig
+	c.SigningKey = key
+	return JWTWithConfig(c)
+}
+
+// JWTWithConfig returns a JWT auth middleware with config.
+// See: `JWT()`.
+func JWTWithConfig(config JWTConfig) echo.MiddlewareFunc {
+	// Defaults
+	if config.Skipper == nil {
+		config.Skipper = DefaultJWTConfig.Skipper
+	}
+	if config.SigningKey == nil {
+		panic("jwt middleware requires signing key")
+	}
+	if config.SigningMethod == "" {
+		config.SigningMethod = DefaultJWTConfig.SigningMethod
+	}
+	if config.ContextKey == "" {
+		config.ContextKey = DefaultJWTConfig.ContextKey
+	}
+	if config.Claims == nil {
+		config.Claims = DefaultJWTConfig.Claims
+	}
+	if config.TokenLookup == "" {
+		config.TokenLookup = DefaultJWTConfig.TokenLookup
+	}
+	if config.AuthScheme == "" {
+		config.AuthScheme = DefaultJWTConfig.AuthScheme
+	}
+	config.keyFunc = func(t *jwt.Token) (interface{}, error) {
+		// Check the signing method
+		if t.Method.Alg() != config.SigningMethod {
+			return nil, fmt.Errorf("Unexpected jwt signing method=%v", t.Header["alg"])
+		}
+		return config.SigningKey, nil
+	}
+
+	// Initialize
+	parts := strings.Split(config.TokenLookup, ":")
+	extractor := jwtFromHeader(parts[1], config.AuthScheme)
+	switch parts[0] {
+	case "query":
+		extractor = jwtFromQuery(parts[1])
+	case "cookie":
+		extractor = jwtFromCookie(parts[1])
+	}
+
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			if config.Skipper(c) {
+				return next(c)
+			}
+
+			auth, err := extractor(c)
+			if err != nil {
+				return echo.NewHTTPError(http.StatusBadRequest, err.Error())
+			}
+			token := new(jwt.Token)
+			// Issue #647, #656
+			if _, ok := config.Claims.(jwt.MapClaims); ok {
+				token, err = jwt.Parse(auth, config.keyFunc)
+			} else {
+				claims := reflect.ValueOf(config.Claims).Interface().(jwt.Claims)
+				token, err = jwt.ParseWithClaims(auth, claims, config.keyFunc)
+			}
+			if err == nil && token.Valid {
+				// Store user information from token into context.
+				c.Set(config.ContextKey, token)
+				return next(c)
+			}
+			return echo.ErrUnauthorized
+		}
+	}
+}
+
+// jwtFromHeader returns a `jwtExtractor` that extracts token from the request header.
+func jwtFromHeader(header string, authScheme string) jwtExtractor {
+	return func(c echo.Context) (string, error) {
+		auth := c.Request().Header.Get(header)
+		l := len(authScheme)
+		if len(auth) > l+1 && auth[:l] == authScheme {
+			return auth[l+1:], nil
+		}
+		return "", errors.New("Missing or invalid jwt in the request header")
+	}
+}
+
+// jwtFromQuery returns a `jwtExtractor` that extracts token from the query string.
+func jwtFromQuery(param string) jwtExtractor {
+	return func(c echo.Context) (string, error) {
+		token := c.QueryParam(param)
+		if token == "" {
+			return "", errors.New("Missing jwt in the query string")
+		}
+		return token, nil
+	}
+}
+
+// jwtFromCookie returns a `jwtExtractor` that extracts token from the named cookie.
+func jwtFromCookie(name string) jwtExtractor {
+	return func(c echo.Context) (string, error) {
+		cookie, err := c.Cookie(name)
+		if err != nil {
+			return "", errors.New("Missing jwt in the cookie")
+		}
+		return cookie.Value, nil
+	}
+}

vendor/github.com/labstack/echo/middleware/key_auth.go

@@ -0,0 +1,133 @@
+package middleware
+
+import (
+	"errors"
+	"net/http"
+	"strings"
+
+	"github.com/labstack/echo"
+)
+
+type (
+	// KeyAuthConfig defines the config for KeyAuth middleware.
+	KeyAuthConfig struct {
+		// Skipper defines a function to skip middleware.
+		Skipper Skipper
+
+		// KeyLookup is a string in the form of "<source>:<name>" that is used
+		// to extract key from the request.
+		// Optional. Default value "header:Authorization".
+		// Possible values:
+		// - "header:<name>"
+		// - "query:<name>"
+		KeyLookup string `json:"key_lookup"`
+
+		// AuthScheme to be used in the Authorization header.
+		// Optional. Default value "Bearer".
+		AuthScheme string
+
+		// Validator is a function to validate key.
+		// Required.
+		Validator KeyAuthValidator
+	}
+
+	// KeyAuthValidator defines a function to validate KeyAuth credentials.
+	KeyAuthValidator func(string, echo.Context) bool
+
+	keyExtractor func(echo.Context) (string, error)
+)
+
+var (
+	// DefaultKeyAuthConfig is the default KeyAuth middleware config.
+	DefaultKeyAuthConfig = KeyAuthConfig{
+		Skipper:    DefaultSkipper,
+		KeyLookup:  "header:" + echo.HeaderAuthorization,
+		AuthScheme: "Bearer",
+	}
+)
+
+// KeyAuth returns an KeyAuth middleware.
+//
+// For valid key it calls the next handler.
+// For invalid key, it sends "401 - Unauthorized" response.
+// For missing key, it sends "400 - Bad Request" response.
+func KeyAuth(fn KeyAuthValidator) echo.MiddlewareFunc {
+	c := DefaultKeyAuthConfig
+	c.Validator = fn
+	return KeyAuthWithConfig(c)
+}
+
+// KeyAuthWithConfig returns an KeyAuth middleware with config.
+// See `KeyAuth()`.
+func KeyAuthWithConfig(config KeyAuthConfig) echo.MiddlewareFunc {
+	// Defaults
+	if config.Skipper == nil {
+		config.Skipper = DefaultKeyAuthConfig.Skipper
+	}
+	// Defaults
+	if config.AuthScheme == "" {
+		config.AuthScheme = DefaultKeyAuthConfig.AuthScheme
+	}
+	if config.KeyLookup == "" {
+		config.KeyLookup = DefaultKeyAuthConfig.KeyLookup
+	}
+	if config.Validator == nil {
+		panic("key-auth middleware requires a validator function")
+	}
+
+	// Initialize
+	parts := strings.Split(config.KeyLookup, ":")
+	extractor := keyFromHeader(parts[1], config.AuthScheme)
+	switch parts[0] {
+	case "query":
+		extractor = keyFromQuery(parts[1])
+	}
+
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			if config.Skipper(c) {
+				return next(c)
+			}
+
+			// Extract and verify key
+			key, err := extractor(c)
+			if err != nil {
+				return echo.NewHTTPError(http.StatusBadRequest, err.Error())
+			}
+			if config.Validator(key, c) {
+				return next(c)
+			}
+
+			return echo.ErrUnauthorized
+		}
+	}
+}
+
+// keyFromHeader returns a `keyExtractor` that extracts key from the request header.
+func keyFromHeader(header string, authScheme string) keyExtractor {
+	return func(c echo.Context) (string, error) {
+		auth := c.Request().Header.Get(header)
+		if auth == "" {
+			return "", errors.New("Missing key in request header")
+		}
+		if header == echo.HeaderAuthorization {
+			l := len(authScheme)
+			if len(auth) > l+1 && auth[:l] == authScheme {
+				return auth[l+1:], nil
+			}
+			return "", errors.New("Invalid key in the request header")
+		}
+		return auth, nil
+	}
+}
+
+// keyFromQuery returns a `keyExtractor` that extracts key from the query string.
+func keyFromQuery(param string) keyExtractor {
+	return func(c echo.Context) (string, error) {
+		key := c.QueryParam(param)
+		if key == "" {
+			return "", errors.New("Missing key in the query string")
+		}
+		return key, nil
+	}
+}

vendor/github.com/labstack/echo/middleware/logger.go

@@ -0,0 +1,191 @@
+package middleware
+
+import (
+	"bytes"
+	"io"
+	"os"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/labstack/echo"
+	"github.com/labstack/gommon/color"
+	"github.com/valyala/fasttemplate"
+)
+
+type (
+	// LoggerConfig defines the config for Logger middleware.
+	LoggerConfig struct {
+		// Skipper defines a function to skip middleware.
+		Skipper Skipper
+
+		// Tags to constructed the logger format.
+		//
+		// - time_unix
+		// - time_unix_nano
+		// - time_rfc3339
+		// - time_rfc3339_nano
+		// - id (Request ID - Not implemented)
+		// - remote_ip
+		// - uri
+		// - host
+		// - method
+		// - path
+		// - referer
+		// - user_agent
+		// - status
+		// - latency (In nanoseconds)
+		// - latency_human (Human readable)
+		// - bytes_in (Bytes received)
+		// - bytes_out (Bytes sent)
+		// - header:<NAME>
+		// - query:<NAME>
+		// - form:<NAME>
+		//
+		// Example "${remote_ip} ${status}"
+		//
+		// Optional. Default value DefaultLoggerConfig.Format.
+		Format string `json:"format"`
+
+		// Output is a writer where logs in JSON format are written.
+		// Optional. Default value os.Stdout.
+		Output io.Writer
+
+		template *fasttemplate.Template
+		colorer  *color.Color
+		pool     *sync.Pool
+	}
+)
+
+var (
+	// DefaultLoggerConfig is the default Logger middleware config.
+	DefaultLoggerConfig = LoggerConfig{
+		Skipper: DefaultSkipper,
+		Format: `{"time":"${time_rfc3339_nano}","remote_ip":"${remote_ip}","host":"${host}",` +
+			`"method":"${method}","uri":"${uri}","status":${status}, "latency":${latency},` +
+			`"latency_human":"${latency_human}","bytes_in":${bytes_in},` +
+			`"bytes_out":${bytes_out}}` + "\n",
+		Output:  os.Stdout,
+		colorer: color.New(),
+	}
+)
+
+// Logger returns a middleware that logs HTTP requests.
+func Logger() echo.MiddlewareFunc {
+	return LoggerWithConfig(DefaultLoggerConfig)
+}
+
+// LoggerWithConfig returns a Logger middleware with config.
+// See: `Logger()`.
+func LoggerWithConfig(config LoggerConfig) echo.MiddlewareFunc {
+	// Defaults
+	if config.Skipper == nil {
+		config.Skipper = DefaultLoggerConfig.Skipper
+	}
+	if config.Format == "" {
+		config.Format = DefaultLoggerConfig.Format
+	}
+	if config.Output == nil {
+		config.Output = DefaultLoggerConfig.Output
+	}
+
+	config.template = fasttemplate.New(config.Format, "${", "}")
+	config.colorer = color.New()
+	config.colorer.SetOutput(config.Output)
+	config.pool = &sync.Pool{
+		New: func() interface{} {
+			return bytes.NewBuffer(make([]byte, 256))
+		},
+	}
+
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) (err error) {
+			if config.Skipper(c) {
+				return next(c)
+			}
+
+			req := c.Request()
+			res := c.Response()
+			start := time.Now()
+			if err = next(c); err != nil {
+				c.Error(err)
+			}
+			stop := time.Now()
+			buf := config.pool.Get().(*bytes.Buffer)
+			buf.Reset()
+			defer config.pool.Put(buf)
+
+			if _, err = config.template.ExecuteFunc(buf, func(w io.Writer, tag string) (int, error) {
+				switch tag {
+				case "time_unix":
+					return buf.WriteString(strconv.FormatInt(time.Now().Unix(), 10))
+				case "time_unix_nano":
+					return buf.WriteString(strconv.FormatInt(time.Now().UnixNano(), 10))
+				case "time_rfc3339":
+					return buf.WriteString(time.Now().Format(time.RFC3339))
+				case "time_rfc3339_nano":
+					return buf.WriteString(time.Now().Format(time.RFC3339Nano))
+				case "remote_ip":
+					return buf.WriteString(c.RealIP())
+				case "host":
+					return buf.WriteString(req.Host)
+				case "uri":
+					return buf.WriteString(req.RequestURI)
+				case "method":
+					return buf.WriteString(req.Method)
+				case "path":
+					p := req.URL.Path
+					if p == "" {
+						p = "/"
+					}
+					return buf.WriteString(p)
+				case "referer":
+					return buf.WriteString(req.Referer())
+				case "user_agent":
+					return buf.WriteString(req.UserAgent())
+				case "status":
+					n := res.Status
+					s := config.colorer.Green(n)
+					switch {
+					case n >= 500:
+						s = config.colorer.Red(n)
+					case n >= 400:
+						s = config.colorer.Yellow(n)
+					case n >= 300:
+						s = config.colorer.Cyan(n)
+					}
+					return buf.WriteString(s)
+				case "latency":
+					l := stop.Sub(start)
+					return buf.WriteString(strconv.FormatInt(int64(l), 10))
+				case "latency_human":
+					return buf.WriteString(stop.Sub(start).String())
+				case "bytes_in":
+					cl := req.Header.Get(echo.HeaderContentLength)
+					if cl == "" {
+						cl = "0"
+					}
+					return buf.WriteString(cl)
+				case "bytes_out":
+					return buf.WriteString(strconv.FormatInt(res.Size, 10))
+				default:
+					switch {
+					case strings.HasPrefix(tag, "header:"):
+						return buf.Write([]byte(c.Request().Header.Get(tag[7:])))
+					case strings.HasPrefix(tag, "query:"):
+						return buf.Write([]byte(c.QueryParam(tag[6:])))
+					case strings.HasPrefix(tag, "form:"):
+						return buf.Write([]byte(c.FormValue(tag[5:])))
+					}
+				}
+				return 0, nil
+			}); err != nil {
+				return
+			}
+
+			_, err = config.Output.Write(buf.Bytes())
+			return
+		}
+	}
+}

vendor/github.com/labstack/echo/middleware/method_override.go

@@ -0,0 +1,88 @@
+package middleware
+
+import "github.com/labstack/echo"
+
+type (
+	// MethodOverrideConfig defines the config for MethodOverride middleware.
+	MethodOverrideConfig struct {
+		// Skipper defines a function to skip middleware.
+		Skipper Skipper
+
+		// Getter is a function that gets overridden method from the request.
+		// Optional. Default values MethodFromHeader(echo.HeaderXHTTPMethodOverride).
+		Getter MethodOverrideGetter
+	}
+
+	// MethodOverrideGetter is a function that gets overridden method from the request
+	MethodOverrideGetter func(echo.Context) string
+)
+
+var (
+	// DefaultMethodOverrideConfig is the default MethodOverride middleware config.
+	DefaultMethodOverrideConfig = MethodOverrideConfig{
+		Skipper: DefaultSkipper,
+		Getter:  MethodFromHeader(echo.HeaderXHTTPMethodOverride),
+	}
+)
+
+// MethodOverride returns a MethodOverride middleware.
+// MethodOverride  middleware checks for the overridden method from the request and
+// uses it instead of the original method.
+//
+// For security reasons, only `POST` method can be overridden.
+func MethodOverride() echo.MiddlewareFunc {
+	return MethodOverrideWithConfig(DefaultMethodOverrideConfig)
+}
+
+// MethodOverrideWithConfig returns a MethodOverride middleware with config.
+// See: `MethodOverride()`.
+func MethodOverrideWithConfig(config MethodOverrideConfig) echo.MiddlewareFunc {
+	// Defaults
+	if config.Skipper == nil {
+		config.Skipper = DefaultMethodOverrideConfig.Skipper
+	}
+	if config.Getter == nil {
+		config.Getter = DefaultMethodOverrideConfig.Getter
+	}
+
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			if config.Skipper(c) {
+				return next(c)
+			}
+
+			req := c.Request()
+			if req.Method == echo.POST {
+				m := config.Getter(c)
+				if m != "" {
+					req.Method = m
+				}
+			}
+			return next(c)
+		}
+	}
+}
+
+// MethodFromHeader is a `MethodOverrideGetter` that gets overridden method from
+// the request header.
+func MethodFromHeader(header string) MethodOverrideGetter {
+	return func(c echo.Context) string {
+		return c.Request().Header.Get(header)
+	}
+}
+
+// MethodFromForm is a `MethodOverrideGetter` that gets overridden method from the
+// form parameter.
+func MethodFromForm(param string) MethodOverrideGetter {
+	return func(c echo.Context) string {
+		return c.FormValue(param)
+	}
+}
+
+// MethodFromQuery is a `MethodOverrideGetter` that gets overridden method from
+// the query parameter.
+func MethodFromQuery(param string) MethodOverrideGetter {
+	return func(c echo.Context) string {
+		return c.QueryParam(param)
+	}
+}

vendor/github.com/labstack/echo/middleware/middleware.go

@@ -0,0 +1,14 @@
+package middleware
+
+import "github.com/labstack/echo"
+
+type (
+	// Skipper defines a function to skip middleware. Returning true skips processing
+	// the middleware.
+	Skipper func(c echo.Context) bool
+)
+
+// DefaultSkipper returns false which processes the middleware.
+func DefaultSkipper(c echo.Context) bool {
+	return false
+}

vendor/github.com/labstack/echo/middleware/recover.go

@@ -0,0 +1,85 @@
+package middleware
+
+import (
+	"fmt"
+	"runtime"
+
+	"github.com/labstack/echo"
+	"github.com/labstack/gommon/color"
+)
+
+type (
+	// RecoverConfig defines the config for Recover middleware.
+	RecoverConfig struct {
+		// Skipper defines a function to skip middleware.
+		Skipper Skipper
+
+		// Size of the stack to be printed.
+		// Optional. Default value 4KB.
+		StackSize int `json:"stack_size"`
+
+		// DisableStackAll disables formatting stack traces of all other goroutines
+		// into buffer after the trace for the current goroutine.
+		// Optional. Default value false.
+		DisableStackAll bool `json:"disable_stack_all"`
+
+		// DisablePrintStack disables printing stack trace.
+		// Optional. Default value as false.
+		DisablePrintStack bool `json:"disable_print_stack"`
+	}
+)
+
+var (
+	// DefaultRecoverConfig is the default Recover middleware config.
+	DefaultRecoverConfig = RecoverConfig{
+		Skipper:           DefaultSkipper,
+		StackSize:         4 << 10, // 4 KB
+		DisableStackAll:   false,
+		DisablePrintStack: false,
+	}
+)
+
+// Recover returns a middleware which recovers from panics anywhere in the chain
+// and handles the control to the centralized HTTPErrorHandler.
+func Recover() echo.MiddlewareFunc {
+	return RecoverWithConfig(DefaultRecoverConfig)
+}
+
+// RecoverWithConfig returns a Recover middleware with config.
+// See: `Recover()`.
+func RecoverWithConfig(config RecoverConfig) echo.MiddlewareFunc {
+	// Defaults
+	if config.Skipper == nil {
+		config.Skipper = DefaultRecoverConfig.Skipper
+	}
+	if config.StackSize == 0 {
+		config.StackSize = DefaultRecoverConfig.StackSize
+	}
+
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			if config.Skipper(c) {
+				return next(c)
+			}
+
+			defer func() {
+				if r := recover(); r != nil {
+					var err error
+					switch r := r.(type) {
+					case error:
+						err = r
+					default:
+						err = fmt.Errorf("%v", r)
+					}
+					stack := make([]byte, config.StackSize)
+					length := runtime.Stack(stack, !config.DisableStackAll)
+					if !config.DisablePrintStack {
+						c.Logger().Printf("[%s] %s %s\n", color.Red("PANIC RECOVER"), err, stack[:length])
+					}
+					c.Error(err)
+				}
+			}()
+			return next(c)
+		}
+	}
+}

vendor/github.com/labstack/echo/middleware/redirect.go

@@ -0,0 +1,215 @@
+package middleware
+
+import (
+	"net/http"
+
+	"github.com/labstack/echo"
+)
+
+type (
+	// RedirectConfig defines the config for Redirect middleware.
+	RedirectConfig struct {
+		// Skipper defines a function to skip middleware.
+		Skipper Skipper
+
+		// Status code to be used when redirecting the request.
+		// Optional. Default value http.StatusMovedPermanently.
+		Code int `json:"code"`
+	}
+)
+
+const (
+	www = "www"
+)
+
+var (
+	// DefaultRedirectConfig is the default Redirect middleware config.
+	DefaultRedirectConfig = RedirectConfig{
+		Skipper: DefaultSkipper,
+		Code:    http.StatusMovedPermanently,
+	}
+)
+
+// HTTPSRedirect redirects http requests to https.
+// For example, http://labstack.com will be redirect to https://labstack.com.
+//
+// Usage `Echo#Pre(HTTPSRedirect())`
+func HTTPSRedirect() echo.MiddlewareFunc {
+	return HTTPSRedirectWithConfig(DefaultRedirectConfig)
+}
+
+// HTTPSRedirectWithConfig returns an HTTPSRedirect middleware with config.
+// See `HTTPSRedirect()`.
+func HTTPSRedirectWithConfig(config RedirectConfig) echo.MiddlewareFunc {
+	// Defaults
+	if config.Skipper == nil {
+		config.Skipper = DefaultTrailingSlashConfig.Skipper
+	}
+	if config.Code == 0 {
+		config.Code = DefaultRedirectConfig.Code
+	}
+
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			if config.Skipper(c) {
+				return next(c)
+			}
+
+			req := c.Request()
+			host := req.Host
+			uri := req.RequestURI
+			if !c.IsTLS() {
+				return c.Redirect(config.Code, "https://"+host+uri)
+			}
+			return next(c)
+		}
+	}
+}
+
+// HTTPSWWWRedirect redirects http requests to https www.
+// For example, http://labstack.com will be redirect to https://www.labstack.com.
+//
+// Usage `Echo#Pre(HTTPSWWWRedirect())`
+func HTTPSWWWRedirect() echo.MiddlewareFunc {
+	return HTTPSWWWRedirectWithConfig(DefaultRedirectConfig)
+}
+
+// HTTPSWWWRedirectWithConfig returns an HTTPSRedirect middleware with config.
+// See `HTTPSWWWRedirect()`.
+func HTTPSWWWRedirectWithConfig(config RedirectConfig) echo.MiddlewareFunc {
+	// Defaults
+	if config.Skipper == nil {
+		config.Skipper = DefaultTrailingSlashConfig.Skipper
+	}
+	if config.Code == 0 {
+		config.Code = DefaultRedirectConfig.Code
+	}
+
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			if config.Skipper(c) {
+				return next(c)
+			}
+
+			req := c.Request()
+			host := req.Host
+			uri := req.RequestURI
+			if !c.IsTLS() && host[:3] != www {
+				return c.Redirect(config.Code, "https://www."+host+uri)
+			}
+			return next(c)
+		}
+	}
+}
+
+// HTTPSNonWWWRedirect redirects http requests to https non www.
+// For example, http://www.labstack.com will be redirect to https://labstack.com.
+//
+// Usage `Echo#Pre(HTTPSNonWWWRedirect())`
+func HTTPSNonWWWRedirect() echo.MiddlewareFunc {
+	return HTTPSNonWWWRedirectWithConfig(DefaultRedirectConfig)
+}
+
+// HTTPSNonWWWRedirectWithConfig returns an HTTPSRedirect middleware with config.
+// See `HTTPSNonWWWRedirect()`.
+func HTTPSNonWWWRedirectWithConfig(config RedirectConfig) echo.MiddlewareFunc {
+	// Defaults
+	if config.Skipper == nil {
+		config.Skipper = DefaultTrailingSlashConfig.Skipper
+	}
+	if config.Code == 0 {
+		config.Code = DefaultRedirectConfig.Code
+	}
+
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			if config.Skipper(c) {
+				return next(c)
+			}
+
+			req := c.Request()
+			host := req.Host
+			uri := req.RequestURI
+			if !c.IsTLS() {
+				if host[:3] == www {
+					return c.Redirect(config.Code, "https://"+host[4:]+uri)
+				}
+				return c.Redirect(config.Code, "https://"+host+uri)
+			}
+			return next(c)
+		}
+	}
+}
+
+// WWWRedirect redirects non www requests to www.
+// For example, http://labstack.com will be redirect to http://www.labstack.com.
+//
+// Usage `Echo#Pre(WWWRedirect())`
+func WWWRedirect() echo.MiddlewareFunc {
+	return WWWRedirectWithConfig(DefaultRedirectConfig)
+}
+
+// WWWRedirectWithConfig returns an HTTPSRedirect middleware with config.
+// See `WWWRedirect()`.
+func WWWRedirectWithConfig(config RedirectConfig) echo.MiddlewareFunc {
+	// Defaults
+	if config.Skipper == nil {
+		config.Skipper = DefaultTrailingSlashConfig.Skipper
+	}
+	if config.Code == 0 {
+		config.Code = DefaultRedirectConfig.Code
+	}
+
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			if config.Skipper(c) {
+				return next(c)
+			}
+
+			req := c.Request()
+			scheme := c.Scheme()
+			host := req.Host
+			if host[:3] != www {
+				uri := req.RequestURI
+				return c.Redirect(config.Code, scheme+"://www."+host+uri)
+			}
+			return next(c)
+		}
+	}
+}
+
+// NonWWWRedirect redirects www requests to non www.
+// For example, http://www.labstack.com will be redirect to http://labstack.com.
+//
+// Usage `Echo#Pre(NonWWWRedirect())`
+func NonWWWRedirect() echo.MiddlewareFunc {
+	return NonWWWRedirectWithConfig(DefaultRedirectConfig)
+}
+
+// NonWWWRedirectWithConfig returns an HTTPSRedirect middleware with config.
+// See `NonWWWRedirect()`.
+func NonWWWRedirectWithConfig(config RedirectConfig) echo.MiddlewareFunc {
+	if config.Skipper == nil {
+		config.Skipper = DefaultTrailingSlashConfig.Skipper
+	}
+	if config.Code == 0 {
+		config.Code = DefaultRedirectConfig.Code
+	}
+
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			if config.Skipper(c) {
+				return next(c)
+			}
+
+			req := c.Request()
+			scheme := c.Scheme()
+			host := req.Host
+			if host[:3] == www {
+				uri := req.RequestURI
+				return c.Redirect(config.Code, scheme+"://"+host[4:]+uri)
+			}
+			return next(c)
+		}
+	}
+}

vendor/github.com/labstack/echo/middleware/secure.go

@@ -0,0 +1,116 @@
+package middleware
+
+import (
+	"fmt"
+
+	"github.com/labstack/echo"
+)
+
+type (
+	// SecureConfig defines the config for Secure middleware.
+	SecureConfig struct {
+		// Skipper defines a function to skip middleware.
+		Skipper Skipper
+
+		// XSSProtection provides protection against cross-site scripting attack (XSS)
+		// by setting the `X-XSS-Protection` header.
+		// Optional. Default value "1; mode=block".
+		XSSProtection string `json:"xss_protection"`
+
+		// ContentTypeNosniff provides protection against overriding Content-Type
+		// header by setting the `X-Content-Type-Options` header.
+		// Optional. Default value "nosniff".
+		ContentTypeNosniff string `json:"content_type_nosniff"`
+
+		// XFrameOptions can be used to indicate whether or not a browser should
+		// be allowed to render a page in a <frame>, <iframe> or <object> .
+		// Sites can use this to avoid clickjacking attacks, by ensuring that their
+		// content is not embedded into other sites.provides protection against
+		// clickjacking.
+		// Optional. Default value "SAMEORIGIN".
+		// Possible values:
+		// - "SAMEORIGIN" - The page can only be displayed in a frame on the same origin as the page itself.
+		// - "DENY" - The page cannot be displayed in a frame, regardless of the site attempting to do so.
+		// - "ALLOW-FROM uri" - The page can only be displayed in a frame on the specified origin.
+		XFrameOptions string `json:"x_frame_options"`
+
+		// HSTSMaxAge sets the `Strict-Transport-Security` header to indicate how
+		// long (in seconds) browsers should remember that this site is only to
+		// be accessed using HTTPS. This reduces your exposure to some SSL-stripping
+		// man-in-the-middle (MITM) attacks.
+		// Optional. Default value 0.
+		HSTSMaxAge int `json:"hsts_max_age"`
+
+		// HSTSExcludeSubdomains won't include subdomains tag in the `Strict Transport Security`
+		// header, excluding all subdomains from security policy. It has no effect
+		// unless HSTSMaxAge is set to a non-zero value.
+		// Optional. Default value false.
+		HSTSExcludeSubdomains bool `json:"hsts_exclude_subdomains"`
+
+		// ContentSecurityPolicy sets the `Content-Security-Policy` header providing
+		// security against cross-site scripting (XSS), clickjacking and other code
+		// injection attacks resulting from execution of malicious content in the
+		// trusted web page context.
+		// Optional. Default value "".
+		ContentSecurityPolicy string `json:"content_security_policy"`
+	}
+)
+
+var (
+	// DefaultSecureConfig is the default Secure middleware config.
+	DefaultSecureConfig = SecureConfig{
+		Skipper:            DefaultSkipper,
+		XSSProtection:      "1; mode=block",
+		ContentTypeNosniff: "nosniff",
+		XFrameOptions:      "SAMEORIGIN",
+	}
+)
+
+// Secure returns a Secure middleware.
+// Secure middleware provides protection against cross-site scripting (XSS) attack,
+// content type sniffing, clickjacking, insecure connection and other code injection
+// attacks.
+func Secure() echo.MiddlewareFunc {
+	return SecureWithConfig(DefaultSecureConfig)
+}
+
+// SecureWithConfig returns a Secure middleware with config.
+// See: `Secure()`.
+func SecureWithConfig(config SecureConfig) echo.MiddlewareFunc {
+	// Defaults
+	if config.Skipper == nil {
+		config.Skipper = DefaultSecureConfig.Skipper
+	}
+
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			if config.Skipper(c) {
+				return next(c)
+			}
+
+			req := c.Request()
+			res := c.Response()
+
+			if config.XSSProtection != "" {
+				res.Header().Set(echo.HeaderXXSSProtection, config.XSSProtection)
+			}
+			if config.ContentTypeNosniff != "" {
+				res.Header().Set(echo.HeaderXContentTypeOptions, config.ContentTypeNosniff)
+			}
+			if config.XFrameOptions != "" {
+				res.Header().Set(echo.HeaderXFrameOptions, config.XFrameOptions)
+			}
+			if (c.IsTLS() || (req.Header.Get(echo.HeaderXForwardedProto) == "https")) && config.HSTSMaxAge != 0 {
+				subdomains := ""
+				if !config.HSTSExcludeSubdomains {
+					subdomains = "; includeSubdomains"
+				}
+				res.Header().Set(echo.HeaderStrictTransportSecurity, fmt.Sprintf("max-age=%d%s", config.HSTSMaxAge, subdomains))
+			}
+			if config.ContentSecurityPolicy != "" {
+				res.Header().Set(echo.HeaderContentSecurityPolicy, config.ContentSecurityPolicy)
+			}
+			return next(c)
+		}
+	}
+}

vendor/github.com/labstack/echo/middleware/slash.go

@@ -0,0 +1,119 @@
+package middleware
+
+import (
+	"github.com/labstack/echo"
+)
+
+type (
+	// TrailingSlashConfig defines the config for TrailingSlash middleware.
+	TrailingSlashConfig struct {
+		// Skipper defines a function to skip middleware.
+		Skipper Skipper
+
+		// Status code to be used when redirecting the request.
+		// Optional, but when provided the request is redirected using this code.
+		RedirectCode int `json:"redirect_code"`
+	}
+)
+
+var (
+	// DefaultTrailingSlashConfig is the default TrailingSlash middleware config.
+	DefaultTrailingSlashConfig = TrailingSlashConfig{
+		Skipper: DefaultSkipper,
+	}
+)
+
+// AddTrailingSlash returns a root level (before router) middleware which adds a
+// trailing slash to the request `URL#Path`.
+//
+// Usage `Echo#Pre(AddTrailingSlash())`
+func AddTrailingSlash() echo.MiddlewareFunc {
+	return AddTrailingSlashWithConfig(DefaultTrailingSlashConfig)
+}
+
+// AddTrailingSlashWithConfig returns a AddTrailingSlash middleware with config.
+// See `AddTrailingSlash()`.
+func AddTrailingSlashWithConfig(config TrailingSlashConfig) echo.MiddlewareFunc {
+	// Defaults
+	if config.Skipper == nil {
+		config.Skipper = DefaultTrailingSlashConfig.Skipper
+	}
+
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			if config.Skipper(c) {
+				return next(c)
+			}
+
+			req := c.Request()
+			url := req.URL
+			path := url.Path
+			qs := c.QueryString()
+			if path != "/" && path[len(path)-1] != '/' {
+				path += "/"
+				uri := path
+				if qs != "" {
+					uri += "?" + qs
+				}
+
+				// Redirect
+				if config.RedirectCode != 0 {
+					return c.Redirect(config.RedirectCode, uri)
+				}
+
+				// Forward
+				req.RequestURI = uri
+				url.Path = path
+			}
+			return next(c)
+		}
+	}
+}
+
+// RemoveTrailingSlash returns a root level (before router) middleware which removes
+// a trailing slash from the request URI.
+//
+// Usage `Echo#Pre(RemoveTrailingSlash())`
+func RemoveTrailingSlash() echo.MiddlewareFunc {
+	return RemoveTrailingSlashWithConfig(TrailingSlashConfig{})
+}
+
+// RemoveTrailingSlashWithConfig returns a RemoveTrailingSlash middleware with config.
+// See `RemoveTrailingSlash()`.
+func RemoveTrailingSlashWithConfig(config TrailingSlashConfig) echo.MiddlewareFunc {
+	// Defaults
+	if config.Skipper == nil {
+		config.Skipper = DefaultTrailingSlashConfig.Skipper
+	}
+
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			if config.Skipper(c) {
+				return next(c)
+			}
+
+			req := c.Request()
+			url := req.URL
+			path := url.Path
+			qs := c.QueryString()
+			l := len(path) - 1
+			if l >= 0 && path != "/" && path[l] == '/' {
+				path = path[:l]
+				uri := path
+				if qs != "" {
+					uri += "?" + qs
+				}
+
+				// Redirect
+				if config.RedirectCode != 0 {
+					return c.Redirect(config.RedirectCode, uri)
+				}
+
+				// Forward
+				req.RequestURI = uri
+				url.Path = path
+			}
+			return next(c)
+		}
+	}
+}

vendor/github.com/labstack/echo/middleware/static.go

@@ -0,0 +1,118 @@
+package middleware
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/labstack/echo"
+)
+
+type (
+	// StaticConfig defines the config for Static middleware.
+	StaticConfig struct {
+		// Skipper defines a function to skip middleware.
+		Skipper Skipper
+
+		// Root directory from where the static content is served.
+		// Required.
+		Root string `json:"root"`
+
+		// Index file for serving a directory.
+		// Optional. Default value "index.html".
+		Index string `json:"index"`
+
+		// Enable HTML5 mode by forwarding all not-found requests to root so that
+		// SPA (single-page application) can handle the routing.
+		// Optional. Default value false.
+		HTML5 bool `json:"html5"`
+
+		// Enable directory browsing.
+		// Optional. Default value false.
+		Browse bool `json:"browse"`
+	}
+)
+
+var (
+	// DefaultStaticConfig is the default Static middleware config.
+	DefaultStaticConfig = StaticConfig{
+		Skipper: DefaultSkipper,
+		Index:   "index.html",
+	}
+)
+
+// Static returns a Static middleware to serves static content from the provided
+// root directory.
+func Static(root string) echo.MiddlewareFunc {
+	c := DefaultStaticConfig
+	c.Root = root
+	return StaticWithConfig(c)
+}
+
+// StaticWithConfig returns a Static middleware with config.
+// See `Static()`.
+func StaticWithConfig(config StaticConfig) echo.MiddlewareFunc {
+	// Defaults
+	if config.Skipper == nil {
+		config.Skipper = DefaultStaticConfig.Skipper
+	}
+	if config.Index == "" {
+		config.Index = DefaultStaticConfig.Index
+	}
+
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			p := c.Param("*")
+			name := filepath.Join(config.Root, p)
+			fi, err := os.Stat(name)
+
+			if err != nil {
+				if os.IsNotExist(err) {
+					if config.HTML5 {
+						return c.File(filepath.Join(config.Root, config.Index))
+					}
+					return echo.ErrNotFound
+				}
+				return err
+			}
+
+			if fi.IsDir() {
+				if config.Browse {
+					return listDir(name, c.Response())
+				}
+				return c.File(filepath.Join(name, config.Index))
+			}
+			return c.File(name)
+		}
+	}
+}
+
+func listDir(name string, res *echo.Response) error {
+	dir, err := os.Open(name)
+	if err != nil {
+		return err
+	}
+	dirs, err := dir.Readdir(-1)
+	if err != nil {
+		return err
+	}
+
+	// Create a directory index
+	res.Header().Set(echo.HeaderContentType, echo.MIMETextHTMLCharsetUTF8)
+	if _, err = fmt.Fprintf(res, "<pre>\n"); err != nil {
+		return err
+	}
+	for _, d := range dirs {
+		name := d.Name()
+		color := "#212121"
+		if d.IsDir() {
+			color = "#e91e63"
+			name += "/"
+		}
+		if _, err = fmt.Fprintf(res, "<a href=\"%s\" style=\"color: %s;\">%s</a>\n", name, color, name); err != nil {
+			return err
+		}
+	}
+	_, err = fmt.Fprintf(res, "</pre>\n")
+	return err
+}

vendor/github.com/labstack/echo/response.go

@@ -0,0 +1,89 @@
+package echo
+
+import (
+	"bufio"
+	"net"
+	"net/http"
+)
+
+type (
+	// Response wraps an http.ResponseWriter and implements its interface to be used
+	// by an HTTP handler to construct an HTTP response.
+	// See: https://golang.org/pkg/net/http/#ResponseWriter
+	Response struct {
+		Writer    http.ResponseWriter
+		Status    int
+		Size      int64
+		Committed bool
+		echo      *Echo
+	}
+)
+
+// NewResponse creates a new instance of Response.
+func NewResponse(w http.ResponseWriter, e *Echo) (r *Response) {
+	return &Response{Writer: w, echo: e}
+}
+
+// Header returns the header map for the writer that will be sent by
+// WriteHeader. Changing the header after a call to WriteHeader (or Write) has
+// no effect unless the modified headers were declared as trailers by setting
+// the "Trailer" header before the call to WriteHeader (see example)
+// To suppress implicit response headers, set their value to nil.
+// Example: https://golang.org/pkg/net/http/#example_ResponseWriter_trailers
+func (r *Response) Header() http.Header {
+	return r.Writer.Header()
+}
+
+// WriteHeader sends an HTTP response header with status code. If WriteHeader is
+// not called explicitly, the first call to Write will trigger an implicit
+// WriteHeader(http.StatusOK). Thus explicit calls to WriteHeader are mainly
+// used to send error codes.
+func (r *Response) WriteHeader(code int) {
+	if r.Committed {
+		r.echo.Logger.Warn("response already committed")
+		return
+	}
+	r.Status = code
+	r.Writer.WriteHeader(code)
+	r.Committed = true
+}
+
+// Write writes the data to the connection as part of an HTTP reply.
+func (r *Response) Write(b []byte) (n int, err error) {
+	if !r.Committed {
+		r.WriteHeader(http.StatusOK)
+	}
+	n, err = r.Writer.Write(b)
+	r.Size += int64(n)
+	return
+}
+
+// Flush implements the http.Flusher interface to allow an HTTP handler to flush
+// buffered data to the client.
+// See [http.Flusher](https://golang.org/pkg/net/http/#Flusher)
+func (r *Response) Flush() {
+	r.Writer.(http.Flusher).Flush()
+}
+
+// Hijack implements the http.Hijacker interface to allow an HTTP handler to
+// take over the connection.
+// See [http.Hijacker](https://golang.org/pkg/net/http/#Hijacker)
+func (r *Response) Hijack() (net.Conn, *bufio.ReadWriter, error) {
+	return r.Writer.(http.Hijacker).Hijack()
+}
+
+// CloseNotify implements the http.CloseNotifier interface to allow detecting
+// when the underlying connection has gone away.
+// This mechanism can be used to cancel long operations on the server if the
+// client has disconnected before the response is ready.
+// See [http.CloseNotifier](https://golang.org/pkg/net/http/#CloseNotifier)
+func (r *Response) CloseNotify() <-chan bool {
+	return r.Writer.(http.CloseNotifier).CloseNotify()
+}
+
+func (r *Response) reset(w http.ResponseWriter) {
+	r.Writer = w
+	r.Size = 0
+	r.Status = http.StatusOK
+	r.Committed = false
+}

vendor/github.com/labstack/echo/router.go

@@ -0,0 +1,436 @@
+package echo
+
+import "strings"
+
+type (
+	// Router is the registry of all registered routes for an `Echo` instance for
+	// request matching and URL path parameter parsing.
+	Router struct {
+		tree   *node
+		routes map[string]Route
+		echo   *Echo
+	}
+	node struct {
+		kind          kind
+		label         byte
+		prefix        string
+		parent        *node
+		children      children
+		ppath         string
+		pnames        []string
+		methodHandler *methodHandler
+	}
+	kind          uint8
+	children      []*node
+	methodHandler struct {
+		connect HandlerFunc
+		delete  HandlerFunc
+		get     HandlerFunc
+		head    HandlerFunc
+		options HandlerFunc
+		patch   HandlerFunc
+		post    HandlerFunc
+		put     HandlerFunc
+		trace   HandlerFunc
+	}
+)
+
+const (
+	skind kind = iota
+	pkind
+	akind
+)
+
+// NewRouter returns a new Router instance.
+func NewRouter(e *Echo) *Router {
+	return &Router{
+		tree: &node{
+			methodHandler: new(methodHandler),
+		},
+		routes: make(map[string]Route),
+		echo:   e,
+	}
+}
+
+// Add registers a new route for method and path with matching handler.
+func (r *Router) Add(method, path string, h HandlerFunc) {
+	// Validate path
+	if path == "" {
+		panic("echo: path cannot be empty")
+	}
+	if path[0] != '/' {
+		path = "/" + path
+	}
+	ppath := path        // Pristine path
+	pnames := []string{} // Param names
+
+	for i, l := 0, len(path); i < l; i++ {
+		if path[i] == ':' {
+			j := i + 1
+
+			r.insert(method, path[:i], nil, skind, "", nil)
+			for ; i < l && path[i] != '/'; i++ {
+			}
+
+			pnames = append(pnames, path[j:i])
+			path = path[:j] + path[i:]
+			i, l = j, len(path)
+
+			if i == l {
+				r.insert(method, path[:i], h, pkind, ppath, pnames)
+				return
+			}
+			r.insert(method, path[:i], nil, pkind, ppath, pnames)
+		} else if path[i] == '*' {
+			r.insert(method, path[:i], nil, skind, "", nil)
+			pnames = append(pnames, "*")
+			r.insert(method, path[:i+1], h, akind, ppath, pnames)
+			return
+		}
+	}
+
+	r.insert(method, path, h, skind, ppath, pnames)
+}
+
+func (r *Router) insert(method, path string, h HandlerFunc, t kind, ppath string, pnames []string) {
+	// Adjust max param
+	l := len(pnames)
+	if *r.echo.maxParam < l {
+		*r.echo.maxParam = l
+	}
+
+	cn := r.tree // Current node as root
+	if cn == nil {
+		panic("echo ⇛ invalid method")
+	}
+	search := path
+
+	for {
+		sl := len(search)
+		pl := len(cn.prefix)
+		l := 0
+
+		// LCP
+		max := pl
+		if sl < max {
+			max = sl
+		}
+		for ; l < max && search[l] == cn.prefix[l]; l++ {
+		}
+
+		if l == 0 {
+			// At root node
+			cn.label = search[0]
+			cn.prefix = search
+			if h != nil {
+				cn.kind = t
+				cn.addHandler(method, h)
+				cn.ppath = ppath
+				cn.pnames = pnames
+			}
+		} else if l < pl {
+			// Split node
+			n := newNode(cn.kind, cn.prefix[l:], cn, cn.children, cn.methodHandler, cn.ppath, cn.pnames)
+
+			// Reset parent node
+			cn.kind = skind
+			cn.label = cn.prefix[0]
+			cn.prefix = cn.prefix[:l]
+			cn.children = nil
+			cn.methodHandler = new(methodHandler)
+			cn.ppath = ""
+			cn.pnames = nil
+
+			cn.addChild(n)
+
+			if l == sl {
+				// At parent node
+				cn.kind = t
+				cn.addHandler(method, h)
+				cn.ppath = ppath
+				cn.pnames = pnames
+			} else {
+				// Create child node
+				n = newNode(t, search[l:], cn, nil, new(methodHandler), ppath, pnames)
+				n.addHandler(method, h)
+				cn.addChild(n)
+			}
+		} else if l < sl {
+			search = search[l:]
+			c := cn.findChildWithLabel(search[0])
+			if c != nil {
+				// Go deeper
+				cn = c
+				continue
+			}
+			// Create child node
+			n := newNode(t, search, cn, nil, new(methodHandler), ppath, pnames)
+			n.addHandler(method, h)
+			cn.addChild(n)
+		} else {
+			// Node already exists
+			if h != nil {
+				cn.addHandler(method, h)
+				cn.ppath = ppath
+				if len(cn.pnames) == 0 { // Issue #729
+					cn.pnames = pnames
+				}
+				for i, n := range pnames {
+					// Param name aliases
+					if i < len(cn.pnames) && !strings.Contains(cn.pnames[i], n) {
+						cn.pnames[i] += "," + n
+					}
+				}
+			}
+		}
+		return
+	}
+}
+
+func newNode(t kind, pre string, p *node, c children, mh *methodHandler, ppath string, pnames []string) *node {
+	return &node{
+		kind:          t,
+		label:         pre[0],
+		prefix:        pre,
+		parent:        p,
+		children:      c,
+		ppath:         ppath,
+		pnames:        pnames,
+		methodHandler: mh,
+	}
+}
+
+func (n *node) addChild(c *node) {
+	n.children = append(n.children, c)
+}
+
+func (n *node) findChild(l byte, t kind) *node {
+	for _, c := range n.children {
+		if c.label == l && c.kind == t {
+			return c
+		}
+	}
+	return nil
+}
+
+func (n *node) findChildWithLabel(l byte) *node {
+	for _, c := range n.children {
+		if c.label == l {
+			return c
+		}
+	}
+	return nil
+}
+
+func (n *node) findChildByKind(t kind) *node {
+	for _, c := range n.children {
+		if c.kind == t {
+			return c
+		}
+	}
+	return nil
+}
+
+func (n *node) addHandler(method string, h HandlerFunc) {
+	switch method {
+	case GET:
+		n.methodHandler.get = h
+	case POST:
+		n.methodHandler.post = h
+	case PUT:
+		n.methodHandler.put = h
+	case DELETE:
+		n.methodHandler.delete = h
+	case PATCH:
+		n.methodHandler.patch = h
+	case OPTIONS:
+		n.methodHandler.options = h
+	case HEAD:
+		n.methodHandler.head = h
+	case CONNECT:
+		n.methodHandler.connect = h
+	case TRACE:
+		n.methodHandler.trace = h
+	}
+}
+
+func (n *node) findHandler(method string) HandlerFunc {
+	switch method {
+	case GET:
+		return n.methodHandler.get
+	case POST:
+		return n.methodHandler.post
+	case PUT:
+		return n.methodHandler.put
+	case DELETE:
+		return n.methodHandler.delete
+	case PATCH:
+		return n.methodHandler.patch
+	case OPTIONS:
+		return n.methodHandler.options
+	case HEAD:
+		return n.methodHandler.head
+	case CONNECT:
+		return n.methodHandler.connect
+	case TRACE:
+		return n.methodHandler.trace
+	default:
+		return nil
+	}
+}
+
+func (n *node) checkMethodNotAllowed() HandlerFunc {
+	for _, m := range methods {
+		if h := n.findHandler(m); h != nil {
+			return MethodNotAllowedHandler
+		}
+	}
+	return NotFoundHandler
+}
+
+// Find lookup a handler registered for method and path. It also parses URL for path
+// parameters and load them into context.
+//
+// For performance:
+//
+// - Get context from `Echo#AcquireContext()`
+// - Reset it `Context#Reset()`
+// - Return it `Echo#ReleaseContext()`.
+func (r *Router) Find(method, path string, context Context) {
+	context.SetPath(path)
+	cn := r.tree // Current node as root
+
+	var (
+		search  = path
+		c       *node  // Child node
+		n       int    // Param counter
+		nk      kind   // Next kind
+		nn      *node  // Next node
+		ns      string // Next search
+		pvalues = context.ParamValues()
+	)
+
+	// Search order static > param > any
+	for {
+		if search == "" {
+			goto End
+		}
+
+		pl := 0 // Prefix length
+		l := 0  // LCP length
+
+		if cn.label != ':' {
+			sl := len(search)
+			pl = len(cn.prefix)
+
+			// LCP
+			max := pl
+			if sl < max {
+				max = sl
+			}
+			for ; l < max && search[l] == cn.prefix[l]; l++ {
+			}
+		}
+
+		if l == pl {
+			// Continue search
+			search = search[l:]
+		} else {
+			cn = nn
+			search = ns
+			if nk == pkind {
+				goto Param
+			} else if nk == akind {
+				goto Any
+			}
+			// Not found
+			return
+		}
+
+		if search == "" {
+			goto End
+		}
+
+		// Static node
+		if c = cn.findChild(search[0], skind); c != nil {
+			// Save next
+			if cn.prefix[len(cn.prefix)-1] == '/' { // Issue #623
+				nk = pkind
+				nn = cn
+				ns = search
+			}
+			cn = c
+			continue
+		}
+
+		// Param node
+	Param:
+		if c = cn.findChildByKind(pkind); c != nil {
+			// Issue #378
+			if len(pvalues) == n {
+				continue
+			}
+
+			// Save next
+			if cn.prefix[len(cn.prefix)-1] == '/' { // Issue #623
+				nk = akind
+				nn = cn
+				ns = search
+			}
+
+			cn = c
+			i, l := 0, len(search)
+			for ; i < l && search[i] != '/'; i++ {
+			}
+			pvalues[n] = search[:i]
+			n++
+			search = search[i:]
+			continue
+		}
+
+		// Any node
+	Any:
+		if cn = cn.findChildByKind(akind); cn == nil {
+			if nn != nil {
+				cn = nn
+				nn = nil // Next
+				search = ns
+				if nk == pkind {
+					goto Param
+				} else if nk == akind {
+					goto Any
+				}
+			}
+			// Not found
+			return
+		}
+		pvalues[len(cn.pnames)-1] = search
+		goto End
+	}
+
+End:
+	context.SetHandler(cn.findHandler(method))
+	context.SetPath(cn.ppath)
+	context.SetParamNames(cn.pnames...)
+
+	// NOTE: Slow zone...
+	if context.Handler() == nil {
+		context.SetHandler(cn.checkMethodNotAllowed())
+
+		// Dig further for any, might have an empty value for *, e.g.
+		// serving a directory. Issue #207.
+		if cn = cn.findChildByKind(akind); cn == nil {
+			return
+		}
+		if h := cn.findHandler(method); h != nil {
+			context.SetHandler(h)
+		} else {
+			context.SetHandler(cn.checkMethodNotAllowed())
+		}
+		context.SetPath(cn.ppath)
+		context.SetParamNames(cn.pnames...)
+		pvalues[len(cn.pnames)-1] = ""
+	}
+
+	return
+}