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53 lines
1.4 KiB
Go
53 lines
1.4 KiB
Go
// Package extensions contains middleware for clean URLs.
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//
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// The root path of the site is passed in as well as possible extensions
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// to try internally for paths requested that don't match an existing
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// resource. The first path+ext combination that matches a valid file
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// will be used.
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package extensions
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import (
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"net/http"
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"os"
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"path"
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"strings"
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"github.com/mholt/caddy/middleware"
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)
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// Ext can assume an extension from clean URLs.
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// It tries extensions in the order listed in Extensions.
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type Ext struct {
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// Next handler in the chain
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Next middleware.Handler
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// Path to ther root of the site
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Root string
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// List of extensions to try
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Extensions []string
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}
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// ServeHTTP implements the middleware.Handler interface.
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func (e Ext) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
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urlpath := strings.TrimSuffix(r.URL.Path, "/")
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if path.Ext(urlpath) == "" && r.URL.Path[len(r.URL.Path)-1] != '/' {
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for _, ext := range e.Extensions {
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if resourceExists(e.Root, urlpath+ext) {
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r.URL.Path = urlpath + ext
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break
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}
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}
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}
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return e.Next.ServeHTTP(w, r)
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}
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// resourceExists returns true if the file specified at
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// root + path exists; false otherwise.
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func resourceExists(root, path string) bool {
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_, err := os.Stat(root + path)
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// technically we should use os.IsNotExist(err)
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// but we don't handle any other kinds of errors anyway
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return err == nil
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}
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