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// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package lfs
import (
"io"
"strconv"
"strings"
"code.gitea.io/gitea/models"
"code.gitea.io/gitea/modules/base"
"code.gitea.io/gitea/modules/setting"
)
// ReadPointerFile will return a partially filled LFSMetaObject if the provided reader is a pointer file
func ReadPointerFile(reader io.Reader) (*models.LFSMetaObject, *[]byte) {
if !setting.LFS.StartServer {
return nil, nil
}
buf := make([]byte, 1024)
n, _ := reader.Read(buf)
buf = buf[:n]
if isTextFile := base.IsTextFile(buf); !isTextFile {
return nil, nil
}
return IsPointerFile(&buf), &buf
}
// IsPointerFile will return a partially filled LFSMetaObject if the provided byte slice is a pointer file
func IsPointerFile(buf *[]byte) *models.LFSMetaObject {
if !setting.LFS.StartServer {
return nil
}
headString := string(*buf)
if !strings.HasPrefix(headString, models.LFSMetaFileIdentifier) {
return nil
}
splitLines := strings.Split(headString, "\n")
if len(splitLines) < 3 {
return nil
}
oid := strings.TrimPrefix(splitLines[1], models.LFSMetaFileOidPrefix)
size, err := strconv.ParseInt(strings.TrimPrefix(splitLines[2], "size "), 10, 64)
if len(oid) != 64 || err != nil {
return nil
}
contentStore := &ContentStore{BasePath: setting.LFS.ContentPath}
meta := &models.LFSMetaObject{Oid: oid, Size: size}
if !contentStore.Exists(meta) {
return nil
}
return meta
}
// ReadMetaObject will read a models.LFSMetaObject and return a reader
func ReadMetaObject(meta *models.LFSMetaObject) (io.ReadCloser, error) {
contentStore := &ContentStore{BasePath: setting.LFS.ContentPath}
return contentStore.Get(meta, 0)
}
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