147 lines
3.7 KiB
Go
147 lines
3.7 KiB
Go
// Copyright 2014 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package fs contains an HTTP file system that works with zip contents.
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package fs
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import (
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"archive/zip"
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"bytes"
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"errors"
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"fmt"
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"io/ioutil"
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"net/http"
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"os"
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"strings"
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)
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var zipData string
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// file holds unzipped read-only file contents and file metadata.
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type file struct {
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os.FileInfo
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data []byte
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}
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type statikFS struct {
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files map[string]file
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}
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// Register registers zip contents data, later used to initialize
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// the statik file system.
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func Register(data string) {
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zipData = data
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}
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// New creates a new file system with the registered zip contents data.
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// It unzips all files and stores them in an in-memory map.
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func New() (http.FileSystem, error) {
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if zipData == "" {
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return nil, errors.New("statik/fs: no zip data registered")
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}
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zipReader, err := zip.NewReader(strings.NewReader(zipData), int64(len(zipData)))
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if err != nil {
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return nil, err
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}
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files := make(map[string]file)
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for _, zipFile := range zipReader.File {
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unzipped, err := unzip(zipFile)
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if err != nil {
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return nil, fmt.Errorf("statik/fs: error unzipping file %q: %s", zipFile.Name, err)
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}
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files["/"+zipFile.Name] = file{
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FileInfo: zipFile.FileInfo(),
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data: unzipped,
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}
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}
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return &statikFS{files: files}, nil
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}
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func unzip(zf *zip.File) ([]byte, error) {
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rc, err := zf.Open()
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if err != nil {
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return nil, err
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}
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defer rc.Close()
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return ioutil.ReadAll(rc)
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}
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// Open returns a file matching the given file name, or os.ErrNotExists if
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// no file matching the given file name is found in the archive.
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// If a directory is requested, Open returns the file named "index.html"
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// in the requested directory, if that file exists.
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func (fs *statikFS) Open(name string) (http.File, error) {
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name = strings.Replace(name, "//", "/", -1)
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f, ok := fs.files[name]
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if ok {
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return newHTTPFile(f, false), nil
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}
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// The file doesn't match, but maybe it's a directory,
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// thus we should look for index.html
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indexName := strings.Replace(name+"/index.html", "//", "/", -1)
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f, ok = fs.files[indexName]
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if !ok {
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return nil, os.ErrNotExist
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}
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return newHTTPFile(f, true), nil
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}
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func newHTTPFile(file file, isDir bool) *httpFile {
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return &httpFile{
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file: file,
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reader: bytes.NewReader(file.data),
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isDir: isDir,
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}
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}
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// httpFile represents an HTTP file and acts as a bridge
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// between file and http.File.
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type httpFile struct {
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file
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reader *bytes.Reader
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isDir bool
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}
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// Read reads bytes into p, returns the number of read bytes.
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func (f *httpFile) Read(p []byte) (n int, err error) {
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return f.reader.Read(p)
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}
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// Seek seeks to the offset.
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func (f *httpFile) Seek(offset int64, whence int) (ret int64, err error) {
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return f.reader.Seek(offset, whence)
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}
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// Stat stats the file.
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func (f *httpFile) Stat() (os.FileInfo, error) {
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return f, nil
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}
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// IsDir returns true if the file location represents a directory.
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func (f *httpFile) IsDir() bool {
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return f.isDir
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}
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// Readdir returns an empty slice of files, directory
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// listing is disabled.
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func (f *httpFile) Readdir(count int) ([]os.FileInfo, error) {
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// directory listing is disabled.
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return make([]os.FileInfo, 0), nil
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}
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func (f *httpFile) Close() error {
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return nil
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}
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