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server.go
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package main
import (
"fmt"
"io"
"net/http"
"os"
"path"
"strings"
"text/template"
"github.com/justinas/alice"
)
const defaultAutoIndexTemplate = `
<!DOCTYPE html>
<html>
<body>
<ul style="list-style: none;">
{{range $file := .}}
<li><a href="{{$file.Name}}">{{$file.Name}}</a></li>
{{end}}
</ul>
</body>
</html>
`
// FileServer is a http.Handler implementation that serves HTTP requests with the contents of the corresponding file.
type FileServer struct {
autoIndex bool
autoIndexTmpl *template.Template
fileSystem dotFileHidingFileSystem
middlewares []alice.Constructor
}
// NewFileServer returns a new handler instance that serves HTTP requests with the contents of the given directory.
func NewFileServer(dir string, options ...Option) http.Handler {
autoIndexTmpl := template.New("autoIndex")
fs := &FileServer{
fileSystem: dotFileHidingFileSystem{http.Dir(dir)},
autoIndexTmpl: template.Must(autoIndexTmpl.Parse(defaultAutoIndexTemplate)),
}
for _, option := range options {
option(fs)
}
return alice.New(fs.middlewares...).Then(fs)
}
// ServeHTTP responds to an HTTP request.
func (fs *FileServer) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
p := path.Clean(req.URL.Path)
file, fileInfo, err := fs.fileSystem.OpenWithStat(p)
if err != nil {
fs.handleError(rw, err)
return
}
defer func() { _ = file.Close() }()
fs.serveContent(rw, req, file, fileInfo)
}
func (fs *FileServer) handleError(rw http.ResponseWriter, err error) {
statusCode := http.StatusInternalServerError
if os.IsNotExist(err) || os.IsPermission(err) {
statusCode = http.StatusNotFound
}
rw.WriteHeader(statusCode)
errorPageName := fmt.Sprintf("%d.html", statusCode)
if file, err := fs.fileSystem.Open(errorPageName); err == nil {
defer func() { _ = file.Close() }()
_, _ = io.Copy(rw, file)
}
}
func (fs *FileServer) serveContent(rw http.ResponseWriter, req *http.Request, file http.File, fileInfo os.FileInfo) {
if !fileInfo.IsDir() {
http.ServeContent(rw, req, fileInfo.Name(), fileInfo.ModTime(), file)
return
}
// enforce trailing slash
if !strings.HasSuffix(req.URL.Path, "/") {
redirectTo(rw, req, fmt.Sprint(req.URL.Path, "/"))
return
}
indexFilePath := path.Clean(req.URL.Path + "/index.html")
indexFile, indexFileInfo, err := fs.fileSystem.OpenWithStat(indexFilePath)
if err == nil {
defer func() { _ = indexFile.Close() }()
http.ServeContent(rw, req, indexFileInfo.Name(), indexFileInfo.ModTime(), indexFile)
return
}
if !fs.autoIndex || !os.IsNotExist(err) {
fs.handleError(rw, err)
return
}
files, err := file.Readdir(-1)
if err != nil {
fs.handleError(rw, err)
return
}
rw.Header().Add("Content-Type", "text/html")
_ = fs.autoIndexTmpl.Execute(rw, files)
}
func redirectTo(rw http.ResponseWriter, req *http.Request, path string) {
if query := req.URL.RawQuery; query != "" {
path += fmt.Sprint("?", query)
}
rw.Header().Add("Location", path)
rw.WriteHeader(http.StatusMovedPermanently)
}