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