mirror of https://github.com/fatedier/frp
147 lines
3.4 KiB
Go
147 lines
3.4 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 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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"io"
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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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"sync"
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)
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var zipData string
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type statikFS struct {
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files map[string]*zip.File
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}
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// 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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// Creates a new file system with the registered zip contents data.
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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]*zip.File)
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for _, file := range zipReader.File {
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files["/"+file.Name] = file
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}
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return &statikFS{files: files}, nil
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}
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// Opens a file, unzip the contents and initializes
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// readers. Returns os.ErrNotExists if file is not
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// found in the archive.
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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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// 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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if !ok {
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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 newFile(f, true)
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}
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return newFile(f, false)
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}
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var nopCloser = ioutil.NopCloser(nil)
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func newFile(zf *zip.File, isDir bool) (*file, 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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all, err := ioutil.ReadAll(rc)
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if err != nil {
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return nil, err
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}
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return &file{
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FileInfo: zf.FileInfo(),
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data: all,
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readerAt: bytes.NewReader(all),
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Closer: nopCloser,
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isDir: isDir,
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}, nil
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}
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// Represents an HTTP file, acts as a bridge between
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// zip.File and http.File.
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type file struct {
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os.FileInfo
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io.Closer
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data []byte // non-nil if regular file
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reader *io.SectionReader
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readerAt io.ReaderAt // over data
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isDir bool
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once sync.Once
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}
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func (f *file) newReader() {
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f.reader = io.NewSectionReader(f.readerAt, 0, f.FileInfo.Size())
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}
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// Reads bytes into p, returns the number of read bytes.
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func (f *file) Read(p []byte) (n int, err error) {
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f.once.Do(f.newReader)
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return f.reader.Read(p)
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}
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// Seeks to the offset.
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func (f *file) Seek(offset int64, whence int) (ret int64, err error) {
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f.once.Do(f.newReader)
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return f.reader.Seek(offset, whence)
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}
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// Stats the file.
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func (f *file) 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 *file) IsDir() bool {
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return f.isDir
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}
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// Returns an empty slice of files, directory
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// listing is disabled.
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func (f *file) 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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