142 lines
3.1 KiB
Go
142 lines
3.1 KiB
Go
package middleware
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import (
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"fmt"
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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"
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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 `json:"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 `json:"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 `json:"html5"`
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// Enable directory browsing.
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// Optional. Default value false.
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Browse bool `json:"browse"`
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}
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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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return func(next echo.HandlerFunc) echo.HandlerFunc {
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return func(c echo.Context) 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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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 config.HTML5 && path.Ext(p) == "" {
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return c.File(filepath.Join(config.Root, config.Index))
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}
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return next(c)
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}
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return err
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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(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 err
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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(name string, res *echo.Response) error {
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dir, err := os.Open(name)
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if err != nil {
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return err
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}
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dirs, err := dir.Readdir(-1)
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if err != nil {
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return err
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}
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// Create a directory index
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res.Header().Set(echo.HeaderContentType, echo.MIMETextHTMLCharsetUTF8)
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if _, err = fmt.Fprintf(res, "<pre>\n"); err != nil {
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return err
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}
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for _, d := range dirs {
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name := d.Name()
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color := "#212121"
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if d.IsDir() {
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color = "#e91e63"
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name += "/"
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}
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if _, err = fmt.Fprintf(res, "<a href=\"%s\" style=\"color: %s;\">%s</a>\n", name, color, name); err != nil {
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return err
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}
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}
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_, err = fmt.Fprintf(res, "</pre>\n")
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return err
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}
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