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Update vendor, move to labstack/echo/v4 Fixes #698
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Wim
229
vendor/github.com/labstack/echo/v4/middleware/static.go
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vendored
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229
vendor/github.com/labstack/echo/v4/middleware/static.go
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package middleware
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import (
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"fmt"
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"html/template"
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"net/http"
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"net/url"
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"os"
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"path"
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"path/filepath"
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"strings"
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"github.com/labstack/echo/v4"
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"github.com/labstack/gommon/bytes"
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)
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type (
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// StaticConfig defines the config for Static middleware.
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StaticConfig struct {
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// Skipper defines a function to skip middleware.
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Skipper Skipper
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// Root directory from where the static content is served.
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// Required.
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Root string `yaml:"root"`
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// Index file for serving a directory.
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// Optional. Default value "index.html".
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Index string `yaml:"index"`
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// Enable HTML5 mode by forwarding all not-found requests to root so that
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// SPA (single-page application) can handle the routing.
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// Optional. Default value false.
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HTML5 bool `yaml:"html5"`
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// Enable directory browsing.
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// Optional. Default value false.
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Browse bool `yaml:"browse"`
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}
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)
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const html = `
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta http-equiv="X-UA-Compatible" content="ie=edge">
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<title>{{ .Name }}</title>
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<style>
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body {
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font-family: Menlo, Consolas, monospace;
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padding: 48px;
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}
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header {
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padding: 4px 16px;
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font-size: 24px;
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}
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ul {
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list-style-type: none;
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margin: 0;
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padding: 20px 0 0 0;
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display: flex;
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flex-wrap: wrap;
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}
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li {
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width: 300px;
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padding: 16px;
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}
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li a {
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display: block;
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overflow: hidden;
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white-space: nowrap;
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text-overflow: ellipsis;
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text-decoration: none;
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transition: opacity 0.25s;
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}
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li span {
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color: #707070;
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font-size: 12px;
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}
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li a:hover {
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opacity: 0.50;
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}
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.dir {
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color: #E91E63;
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}
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.file {
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color: #673AB7;
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}
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</style>
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</head>
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<body>
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<header>
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{{ .Name }}
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</header>
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<ul>
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{{ range .Files }}
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<li>
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{{ if .Dir }}
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{{ $name := print .Name "/" }}
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<a class="dir" href="{{ $name }}">{{ $name }}</a>
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{{ else }}
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<a class="file" href="{{ .Name }}">{{ .Name }}</a>
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<span>{{ .Size }}</span>
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{{ end }}
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</li>
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{{ end }}
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</ul>
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</body>
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</html>
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`
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var (
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// DefaultStaticConfig is the default Static middleware config.
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DefaultStaticConfig = StaticConfig{
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Skipper: DefaultSkipper,
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Index: "index.html",
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}
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)
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// Static returns a Static middleware to serves static content from the provided
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// root directory.
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func Static(root string) echo.MiddlewareFunc {
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c := DefaultStaticConfig
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c.Root = root
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return StaticWithConfig(c)
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}
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// StaticWithConfig returns a Static middleware with config.
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// See `Static()`.
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func StaticWithConfig(config StaticConfig) echo.MiddlewareFunc {
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// Defaults
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if config.Root == "" {
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config.Root = "." // For security we want to restrict to CWD.
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}
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if config.Skipper == nil {
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config.Skipper = DefaultStaticConfig.Skipper
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}
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if config.Index == "" {
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config.Index = DefaultStaticConfig.Index
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}
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// Index template
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t, err := template.New("index").Parse(html)
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if err != nil {
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panic(fmt.Sprintf("echo: %v", err))
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}
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return func(next echo.HandlerFunc) echo.HandlerFunc {
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return func(c echo.Context) (err error) {
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if config.Skipper(c) {
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return next(c)
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}
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p := c.Request().URL.Path
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if strings.HasSuffix(c.Path(), "*") { // When serving from a group, e.g. `/static*`.
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p = c.Param("*")
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}
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p, err = url.PathUnescape(p)
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if err != nil {
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return
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}
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name := filepath.Join(config.Root, path.Clean("/"+p)) // "/"+ for security
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fi, err := os.Stat(name)
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if err != nil {
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if os.IsNotExist(err) {
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if err = next(c); err != nil {
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if he, ok := err.(*echo.HTTPError); ok {
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if config.HTML5 && he.Code == http.StatusNotFound {
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return c.File(filepath.Join(config.Root, config.Index))
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}
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}
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return
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}
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}
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return
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}
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if fi.IsDir() {
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index := filepath.Join(name, config.Index)
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fi, err = os.Stat(index)
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if err != nil {
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if config.Browse {
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return listDir(t, name, c.Response())
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}
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if os.IsNotExist(err) {
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return next(c)
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}
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return
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}
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return c.File(index)
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}
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return c.File(name)
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}
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}
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}
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func listDir(t *template.Template, name string, res *echo.Response) (err error) {
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file, err := os.Open(name)
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if err != nil {
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return
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}
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files, err := file.Readdir(-1)
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if err != nil {
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return
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}
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// Create directory index
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res.Header().Set(echo.HeaderContentType, echo.MIMETextHTMLCharsetUTF8)
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data := struct {
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Name string
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Files []interface{}
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}{
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Name: name,
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}
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for _, f := range files {
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data.Files = append(data.Files, struct {
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Name string
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Dir bool
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Size string
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}{f.Name(), f.IsDir(), bytes.Format(f.Size())})
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}
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return t.Execute(res, data)
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}
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