Update vendor

vendor/github.com/gorilla/schema/cache.go

@@ -138,7 +138,12 @@ func (c *cache) create(t reflect.Type, info *structInfo) *structInfo {
 				ft = ft.Elem()
 			}
 			if ft.Kind() == reflect.Struct {
+				bef := len(info.fields)
 				c.create(ft, info)
+				for _, fi := range info.fields[bef:len(info.fields)] {
+					// exclude required check because duplicated to embedded field
+					fi.required = false
+				}
 			}
 		}
 		c.createField(field, info)
@@ -148,7 +153,7 @@ func (c *cache) create(t reflect.Type, info *structInfo) *structInfo {
 
 // createField creates a fieldInfo for the given field.
 func (c *cache) createField(field reflect.StructField, info *structInfo) {
-	alias := fieldAlias(field, c.tag)
+	alias, options := fieldAlias(field, c.tag)
 	if alias == "-" {
 		// Ignore this field.
 		return
@@ -173,17 +178,19 @@ func (c *cache) createField(field reflect.StructField, info *structInfo) {
 		}
 	}
 	if isStruct = ft.Kind() == reflect.Struct; !isStruct {
-		if conv := c.conv[ft.Kind()]; conv == nil {
+		if conv := c.converter(ft); conv == nil {
 			// Type is not supported.
 			return
 		}
 	}
 
 	info.fields = append(info.fields, &fieldInfo{
-		typ:   field.Type,
-		name:  field.Name,
-		ss:    isSlice && isStruct,
-		alias: alias,
+		typ:      field.Type,
+		name:     field.Name,
+		ss:       isSlice && isStruct,
+		alias:    alias,
+		anon:     field.Anonymous,
+		required: options.Contains("required"),
 	})
 }
 
@@ -212,10 +219,12 @@ func (i *structInfo) get(alias string) *fieldInfo {
 }
 
 type fieldInfo struct {
-	typ   reflect.Type
-	name  string // field name in the struct.
-	ss    bool   // true if this is a slice of structs.
-	alias string
+	typ      reflect.Type
+	name     string // field name in the struct.
+	ss       bool   // true if this is a slice of structs.
+	alias    string
+	anon     bool // is an embedded field
+	required bool // tag option
 }
 
 type pathPart struct {
@@ -227,19 +236,33 @@ type pathPart struct {
 // ----------------------------------------------------------------------------
 
 // fieldAlias parses a field tag to get a field alias.
-func fieldAlias(field reflect.StructField, tagName string) string {
-	var alias string
+func fieldAlias(field reflect.StructField, tagName string) (alias string, options tagOptions) {
 	if tag := field.Tag.Get(tagName); tag != "" {
-		// For now tags only support the name but let's follow the
-		// comma convention from encoding/json and others.
-		if idx := strings.Index(tag, ","); idx == -1 {
-			alias = tag
-		} else {
-			alias = tag[:idx]
-		}
+		alias, options = parseTag(tag)
 	}
 	if alias == "" {
 		alias = field.Name
 	}
-	return alias
+	return alias, options
+}
+
+// tagOptions is the string following a comma in a struct field's tag, or
+// the empty string. It does not include the leading comma.
+type tagOptions []string
+
+// parseTag splits a struct field's url tag into its name and comma-separated
+// options.
+func parseTag(tag string) (string, tagOptions) {
+	s := strings.Split(tag, ",")
+	return s[0], s[1:]
+}
+
+// Contains checks whether the tagOptions contains the specified option.
+func (o tagOptions) Contains(option string) bool {
+	for _, s := range o {
+		if s == option {
+			return true
+		}
+	}
+	return false
 }

vendor/github.com/gorilla/schema/decoder.go

@@ -87,9 +87,60 @@ func (d *Decoder) Decode(dst interface{}, src map[string][]string) error {
 	if len(errors) > 0 {
 		return errors
 	}
+	return d.checkRequired(t, src, "")
+}
+
+// checkRequired checks whether requred field empty
+//
+// check type t recursively if t has struct fields, and prefix is same as parsePath: in dotted notation
+//
+// src is the source map for decoding, we use it here to see if those required fields are included in src
+func (d *Decoder) checkRequired(t reflect.Type, src map[string][]string, prefix string) error {
+	struc := d.cache.get(t)
+	if struc == nil {
+		// unexpect, cache.get never return nil
+		return errors.New("cache fail")
+	}
+
+	for _, f := range struc.fields {
+		if f.typ.Kind() == reflect.Struct {
+			err := d.checkRequired(f.typ, src, prefix+f.alias+".")
+			if err != nil {
+				if !f.anon {
+					return err
+				}
+				// check embedded parent field.
+				err2 := d.checkRequired(f.typ, src, prefix)
+				if err2 != nil {
+					return err
+				}
+			}
+		}
+		if f.required {
+			key := f.alias
+			if prefix != "" {
+				key = prefix + key
+			}
+			if isEmpty(f.typ, src[key]) {
+				return fmt.Errorf("%v is empty", key)
+			}
+		}
+	}
 	return nil
 }
 
+// isEmpty returns true if value is empty for specific type
+func isEmpty(t reflect.Type, value []string) bool {
+	if len(value) == 0 {
+		return true
+	}
+	switch t.Kind() {
+	case boolType, float32Type, float64Type, intType, int8Type, int32Type, int64Type, stringType, uint8Type, uint16Type, uint32Type, uint64Type:
+		return len(value[0]) == 0
+	}
+	return false
+}
+
 // decode fills a struct field using a parsed path.
 func (d *Decoder) decode(v reflect.Value, path string, parts []pathPart, values []string) error {
 	// Get the field walking the struct fields by index.

vendor/github.com/gorilla/schema/doc.go

@@ -12,7 +12,7 @@ The basic usage is really simple. Given this struct:
 		Phone string
 	}
 
-...we can fill it passing a map to the Load() function:
+...we can fill it passing a map to the Decode() function:
 
 	values := map[string][]string{
 		"Name":  {"John"},

vendor/github.com/gorilla/schema/encoder.go

@@ -0,0 +1,161 @@
+package schema
+
+import (
+	"errors"
+	"fmt"
+	"reflect"
+	"strconv"
+)
+
+type encoderFunc func(reflect.Value) string
+
+// Encoder encodes values from a struct into url.Values.
+type Encoder struct {
+	cache  *cache
+	regenc map[reflect.Type]encoderFunc
+}
+
+// NewEncoder returns a new Encoder with defaults.
+func NewEncoder() *Encoder {
+	return &Encoder{cache: newCache(), regenc: make(map[reflect.Type]encoderFunc)}
+}
+
+// Encode encodes a struct into map[string][]string.
+//
+// Intended for use with url.Values.
+func (e *Encoder) Encode(src interface{}, dst map[string][]string) error {
+	v := reflect.ValueOf(src)
+
+	return e.encode(v, dst)
+}
+
+// RegisterEncoder registers a converter for encoding a custom type.
+func (e *Encoder) RegisterEncoder(value interface{}, encoder func(reflect.Value) string) {
+	e.regenc[reflect.TypeOf(value)] = encoder
+}
+
+// SetAliasTag changes the tag used to locate custom field aliases.
+// The default tag is "schema".
+func (e *Encoder) SetAliasTag(tag string) {
+	e.cache.tag = tag
+}
+
+func (e *Encoder) encode(v reflect.Value, dst map[string][]string) error {
+	if v.Kind() == reflect.Ptr {
+		v = v.Elem()
+	}
+	if v.Kind() != reflect.Struct {
+		return errors.New("schema: interface must be a struct")
+	}
+	t := v.Type()
+
+	errors := MultiError{}
+
+	for i := 0; i < v.NumField(); i++ {
+		name, opts := fieldAlias(t.Field(i), e.cache.tag)
+		if name == "-" {
+			continue
+		}
+
+		if v.Field(i).Type().Kind() == reflect.Struct {
+			e.encode(v.Field(i), dst)
+			continue
+		}
+
+		encFunc := typeEncoder(v.Field(i).Type(), e.regenc)
+
+		// Encode non-slice types and custom implementations immediately.
+		if encFunc != nil {
+			value := encFunc(v.Field(i))
+			if value == "" && opts.Contains("omitempty") {
+				continue
+			}
+
+			dst[name] = append(dst[name], value)
+			continue
+		}
+
+		if v.Field(i).Type().Kind() == reflect.Slice {
+			encFunc = typeEncoder(v.Field(i).Type().Elem(), e.regenc)
+		}
+
+		if encFunc == nil {
+			errors[v.Field(i).Type().String()] = fmt.Errorf("schema: encoder not found for %v", v.Field(i))
+			continue
+		}
+
+		// Encode a slice.
+		if v.Field(i).Len() == 0 && opts.Contains("omitempty") {
+			continue
+		}
+
+		dst[name] = []string{}
+		for j := 0; j < v.Field(i).Len(); j++ {
+			dst[name] = append(dst[name], encFunc(v.Field(i).Index(j)))
+		}
+	}
+
+	if len(errors) > 0 {
+		return errors
+	}
+	return nil
+}
+
+func typeEncoder(t reflect.Type, reg map[reflect.Type]encoderFunc) encoderFunc {
+	if f, ok := reg[t]; ok {
+		return f
+	}
+
+	switch t.Kind() {
+	case reflect.Bool:
+		return encodeBool
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		return encodeInt
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		return encodeUint
+	case reflect.Float32:
+		return encodeFloat32
+	case reflect.Float64:
+		return encodeFloat64
+	case reflect.Ptr:
+		f := typeEncoder(t.Elem(), reg)
+		return func(v reflect.Value) string {
+			if v.IsNil() {
+				return "null"
+			}
+			return f(v.Elem())
+		}
+	case reflect.String:
+		return encodeString
+	default:
+		return nil
+	}
+}
+
+func encodeBool(v reflect.Value) string {
+	return strconv.FormatBool(v.Bool())
+}
+
+func encodeInt(v reflect.Value) string {
+	return strconv.FormatInt(int64(v.Int()), 10)
+}
+
+func encodeUint(v reflect.Value) string {
+	return strconv.FormatUint(uint64(v.Uint()), 10)
+}
+
+func encodeFloat(v reflect.Value, bits int) string {
+	return strconv.FormatFloat(v.Float(), 'f', 6, bits)
+}
+
+func encodeFloat32(v reflect.Value) string {
+	return encodeFloat(v, 32)
+}
+
+func encodeFloat64(v reflect.Value) string {
+	return encodeFloat(v, 64)
+}
+
+func encodeString(v reflect.Value) string {
+	return v.String()
+}