85 lines
1.7 KiB
Go
85 lines
1.7 KiB
Go
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package negroni
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import (
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"net/http"
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"path"
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"strings"
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)
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// Static is a middleware handler that serves static files in the given directory/filesystem.
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type Static struct {
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// Dir is the directory to serve static files from
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Dir http.FileSystem
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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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// IndexFile defines which file to serve as index if it exists.
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IndexFile string
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}
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// NewStatic returns a new instance of Static
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func NewStatic(directory http.FileSystem) *Static {
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return &Static{
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Dir: directory,
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Prefix: "",
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IndexFile: "index.html",
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}
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}
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func (s *Static) ServeHTTP(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
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if r.Method != "GET" && r.Method != "HEAD" {
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next(rw, r)
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return
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}
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file := r.URL.Path
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// if we have a prefix, filter requests by stripping the prefix
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if s.Prefix != "" {
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if !strings.HasPrefix(file, s.Prefix) {
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next(rw, r)
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return
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}
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file = file[len(s.Prefix):]
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if file != "" && file[0] != '/' {
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next(rw, r)
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return
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}
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}
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f, err := s.Dir.Open(file)
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if err != nil {
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// discard the error?
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next(rw, r)
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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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next(rw, r)
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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(r.URL.Path, "/") {
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http.Redirect(rw, r, r.URL.Path+"/", http.StatusFound)
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return
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}
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file = path.Join(file, s.IndexFile)
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f, err = s.Dir.Open(file)
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if err != nil {
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next(rw, r)
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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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next(rw, r)
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return
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}
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}
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http.ServeContent(rw, r, file, fi.ModTime(), f)
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}
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