mirror of https://github.com/gohugoio/hugo.git
93 lines
2.5 KiB
Go
93 lines
2.5 KiB
Go
// Copyright 2019 The Hugo Authors. 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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// 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 hugofs
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import (
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"crypto/md5"
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"encoding/hex"
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"hash"
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"os"
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"github.com/spf13/afero"
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)
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var (
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_ afero.Fs = (*md5HashingFs)(nil)
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)
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// FileHashReceiver will receive the filename an the content's MD5 sum on file close.
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type FileHashReceiver interface {
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OnFileClose(name, md5sum string)
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}
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type md5HashingFs struct {
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afero.Fs
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hashReceiver FileHashReceiver
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}
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// NewHashingFs creates a new filesystem that will receive MD5 checksums of
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// any written file content on Close. Note that this is probably not a good
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// idea for "full build" situations, but when doing fast render mode, the amount
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// of files published is low, and it would be really nice to know exactly which
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// of these files where actually changed.
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// Note that this will only work for file operations that use the io.Writer
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// to write content to file, but that is fine for the "publish content" use case.
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func NewHashingFs(delegate afero.Fs, hashReceiver FileHashReceiver) afero.Fs {
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return &md5HashingFs{Fs: delegate, hashReceiver: hashReceiver}
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}
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func (fs *md5HashingFs) Create(name string) (afero.File, error) {
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f, err := fs.Fs.Create(name)
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if err == nil {
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f = fs.wrapFile(f)
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}
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return f, err
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}
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func (fs *md5HashingFs) OpenFile(name string, flag int, perm os.FileMode) (afero.File, error) {
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f, err := fs.Fs.OpenFile(name, flag, perm)
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if err == nil && isWrite(flag) {
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f = fs.wrapFile(f)
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}
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return f, err
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}
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func (fs *md5HashingFs) wrapFile(f afero.File) afero.File {
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return &hashingFile{File: f, h: md5.New(), hashReceiver: fs.hashReceiver}
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}
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func (fs *md5HashingFs) Name() string {
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return "md5HashingFs"
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}
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type hashingFile struct {
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hashReceiver FileHashReceiver
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h hash.Hash
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afero.File
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}
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func (h *hashingFile) Write(p []byte) (n int, err error) {
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n, err = h.File.Write(p)
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if err != nil {
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return
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}
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return h.h.Write(p)
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}
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func (h *hashingFile) Close() error {
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sum := hex.EncodeToString(h.h.Sum(nil))
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h.hashReceiver.OnFileClose(h.Name(), sum)
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return h.File.Close()
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}
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