128 lines
3.1 KiB
Go
128 lines
3.1 KiB
Go
// Copyright 2013 The Martini Authors. All rights reserved.
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// Copyright 2014 The Gogs Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package middleware
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import (
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"log"
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"net/http"
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"path"
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"runtime"
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"strings"
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"github.com/go-martini/martini"
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"github.com/gogits/gogs/modules/setting"
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)
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// StaticOptions is a struct for specifying configuration options for the martini.Static middleware.
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type StaticOptions struct {
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// Prefix is the optional prefix used to serve the static directory content
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Prefix string
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// SkipLogging will disable [Static] log messages when a static file is served.
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SkipLogging bool
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// IndexFile defines which file to serve as index if it exists.
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IndexFile string
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// Expires defines which user-defined function to use for producing a HTTP Expires Header
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// https://developers.google.com/speed/docs/insights/LeverageBrowserCaching
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Expires func() string
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}
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func prepareStaticOptions(options []StaticOptions) StaticOptions {
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var opt StaticOptions
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if len(options) > 0 {
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opt = options[0]
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}
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// Defaults
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if len(opt.IndexFile) == 0 {
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opt.IndexFile = "index.html"
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}
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// Normalize the prefix if provided
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if opt.Prefix != "" {
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// Ensure we have a leading '/'
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if opt.Prefix[0] != '/' {
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opt.Prefix = "/" + opt.Prefix
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}
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// Remove any trailing '/'
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opt.Prefix = strings.TrimRight(opt.Prefix, "/")
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}
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return opt
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}
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// Static returns a middleware handler that serves static files in the given directory.
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func Static(directory string, staticOpt ...StaticOptions) martini.Handler {
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if runtime.GOOS == "windows" {
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if len(directory) < 2 || directory[1] != ':' {
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directory = path.Join(setting.StaticRootPath, directory)
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}
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} else if !path.IsAbs(directory) {
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directory = path.Join(setting.StaticRootPath, directory)
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}
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dir := http.Dir(directory)
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opt := prepareStaticOptions(staticOpt)
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return func(res http.ResponseWriter, req *http.Request, log *log.Logger) {
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if req.Method != "GET" && req.Method != "HEAD" {
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return
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}
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file := req.URL.Path
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// if we have a prefix, filter requests by stripping the prefix
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if opt.Prefix != "" {
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if !strings.HasPrefix(file, opt.Prefix) {
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return
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}
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file = file[len(opt.Prefix):]
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if file != "" && file[0] != '/' {
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return
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}
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}
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f, err := dir.Open(file)
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if err != nil {
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// discard the error?
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return
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}
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defer f.Close()
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fi, err := f.Stat()
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if err != nil {
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return
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}
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// try to serve index file
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if fi.IsDir() {
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// redirect if missing trailing slash
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if !strings.HasSuffix(req.URL.Path, "/") {
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http.Redirect(res, req, req.URL.Path+"/", http.StatusFound)
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return
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}
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file = path.Join(file, opt.IndexFile)
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f, err = dir.Open(file)
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if err != nil {
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return
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}
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defer f.Close()
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fi, err = f.Stat()
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if err != nil || fi.IsDir() {
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return
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}
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}
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if !opt.SkipLogging {
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log.Println("[Static] Serving " + file)
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}
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// Add an Expires header to the static content
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if opt.Expires != nil {
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res.Header().Set("Expires", opt.Expires())
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}
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http.ServeContent(res, req, file, fi.ModTime(), f)
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}
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}
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