mirror of
https://codeberg.org/forgejo/forgejo.git
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147 lines
3.9 KiB
Go
147 lines
3.9 KiB
Go
// Copyright 2020 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package lfs
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import (
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"crypto/sha256"
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"encoding/hex"
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"errors"
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"hash"
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"io"
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"os"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/storage"
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)
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var (
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// ErrHashMismatch occurs if the content has does not match OID
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ErrHashMismatch = errors.New("Content hash does not match OID")
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// ErrSizeMismatch occurs if the content size does not match
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ErrSizeMismatch = errors.New("Content size does not match")
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)
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// ContentStore provides a simple file system based storage.
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type ContentStore struct {
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storage.ObjectStorage
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}
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// NewContentStore creates the default ContentStore
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func NewContentStore() *ContentStore {
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contentStore := &ContentStore{ObjectStorage: storage.LFS}
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return contentStore
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}
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// Get takes a Meta object and retrieves the content from the store, returning
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// it as an io.ReadSeekCloser.
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func (s *ContentStore) Get(pointer Pointer) (storage.Object, error) {
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f, err := s.Open(pointer.RelativePath())
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if err != nil {
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log.Error("Whilst trying to read LFS OID[%s]: Unable to open Error: %v", pointer.Oid, err)
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return nil, err
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}
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return f, err
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}
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// Put takes a Meta object and an io.Reader and writes the content to the store.
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func (s *ContentStore) Put(pointer Pointer, r io.Reader) error {
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p := pointer.RelativePath()
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// Wrap the provided reader with an inline hashing and size checker
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wrappedRd := newHashingReader(pointer.Size, pointer.Oid, r)
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// now pass the wrapped reader to Save - if there is a size mismatch or hash mismatch then
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// the errors returned by the newHashingReader should percolate up to here
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written, err := s.Save(p, wrappedRd, pointer.Size)
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if err != nil {
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log.Error("Whilst putting LFS OID[%s]: Failed to copy to tmpPath: %s Error: %v", pointer.Oid, p, err)
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return err
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}
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// This shouldn't happen but it is sensible to test
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if written != pointer.Size {
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if err := s.Delete(p); err != nil {
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log.Error("Cleaning the LFS OID[%s] failed: %v", pointer.Oid, err)
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}
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return ErrSizeMismatch
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}
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return nil
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}
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// Exists returns true if the object exists in the content store.
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func (s *ContentStore) Exists(pointer Pointer) (bool, error) {
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_, err := s.ObjectStorage.Stat(pointer.RelativePath())
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if err != nil {
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if os.IsNotExist(err) {
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return false, nil
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}
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return false, err
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}
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return true, nil
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}
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// Verify returns true if the object exists in the content store and size is correct.
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func (s *ContentStore) Verify(pointer Pointer) (bool, error) {
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p := pointer.RelativePath()
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fi, err := s.ObjectStorage.Stat(p)
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if os.IsNotExist(err) || (err == nil && fi.Size() != pointer.Size) {
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return false, nil
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} else if err != nil {
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log.Error("Unable stat file: %s for LFS OID[%s] Error: %v", p, pointer.Oid, err)
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return false, err
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}
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return true, nil
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}
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// ReadMetaObject will read a git_model.LFSMetaObject and return a reader
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func ReadMetaObject(pointer Pointer) (io.ReadCloser, error) {
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contentStore := NewContentStore()
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return contentStore.Get(pointer)
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}
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type hashingReader struct {
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internal io.Reader
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currentSize int64
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expectedSize int64
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hash hash.Hash
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expectedHash string
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}
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func (r *hashingReader) Read(b []byte) (int, error) {
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n, err := r.internal.Read(b)
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if n > 0 {
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r.currentSize += int64(n)
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wn, werr := r.hash.Write(b[:n])
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if wn != n || werr != nil {
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return n, werr
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}
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}
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if err != nil && err == io.EOF {
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if r.currentSize != r.expectedSize {
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return n, ErrSizeMismatch
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}
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shaStr := hex.EncodeToString(r.hash.Sum(nil))
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if shaStr != r.expectedHash {
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return n, ErrHashMismatch
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}
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}
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return n, err
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}
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func newHashingReader(expectedSize int64, expectedHash string, reader io.Reader) *hashingReader {
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return &hashingReader{
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internal: reader,
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expectedSize: expectedSize,
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expectedHash: expectedHash,
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hash: sha256.New(),
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}
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}
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