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121 lines
3.3 KiB
121 lines
3.3 KiB
// 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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"fmt"
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"io"
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"os"
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"code.gitea.io/gitea/models"
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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 = errors.New("Content hash does not match OID")
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errSizeMismatch = errors.New("Content size does not match")
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)
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// ErrRangeNotSatisfiable represents an error which request range is not satisfiable.
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type ErrRangeNotSatisfiable struct {
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FromByte int64
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}
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func (err ErrRangeNotSatisfiable) Error() string {
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return fmt.Sprintf("Requested range %d is not satisfiable", err.FromByte)
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}
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// IsErrRangeNotSatisfiable returns true if the error is an ErrRangeNotSatisfiable
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func IsErrRangeNotSatisfiable(err error) bool {
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_, ok := err.(ErrRangeNotSatisfiable)
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return ok
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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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// Get takes a Meta object and retrieves the content from the store, returning
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// it as an io.Reader. If fromByte > 0, the reader starts from that byte
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func (s *ContentStore) Get(meta *models.LFSMetaObject, fromByte int64) (io.ReadCloser, error) {
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f, err := s.Open(meta.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", meta.Oid, err)
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return nil, err
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}
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if fromByte > 0 {
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if fromByte >= meta.Size {
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return nil, ErrRangeNotSatisfiable{
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FromByte: fromByte,
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}
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}
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_, err = f.Seek(fromByte, io.SeekStart)
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if err != nil {
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log.Error("Whilst trying to read LFS OID[%s]: Unable to seek to %d Error: %v", meta.Oid, fromByte, err)
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}
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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(meta *models.LFSMetaObject, r io.Reader) error {
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hash := sha256.New()
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rd := io.TeeReader(r, hash)
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p := meta.RelativePath()
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written, err := s.Save(p, rd)
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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", meta.Oid, p, err)
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return err
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}
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if written != meta.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", meta.Oid, err)
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}
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return errSizeMismatch
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}
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shaStr := hex.EncodeToString(hash.Sum(nil))
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if shaStr != meta.Oid {
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if err := s.Delete(p); err != nil {
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log.Error("Cleaning the LFS OID[%s] failed: %v", meta.Oid, err)
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}
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return errHashMismatch
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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(meta *models.LFSMetaObject) (bool, error) {
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_, err := s.ObjectStorage.Stat(meta.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(meta *models.LFSMetaObject) (bool, error) {
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p := meta.RelativePath()
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fi, err := s.ObjectStorage.Stat(p)
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if os.IsNotExist(err) || (err == nil && fi.Size() != meta.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, meta.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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