/
localfs.go
192 lines (157 loc) · 3.93 KB
/
localfs.go
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package localfs
import (
"encoding/json"
"io"
"io/ioutil"
"os"
"path"
"time"
"github.com/andreimarcu/linx-server/backends"
"github.com/andreimarcu/linx-server/helpers"
)
type LocalfsBackend struct {
metaPath string
filesPath string
}
type MetadataJSON struct {
DeleteKey string `json:"delete_key"`
AccessKey string `json:"access_key,omitempty"`
Sha256sum string `json:"sha256sum"`
Mimetype string `json:"mimetype"`
Size int64 `json:"size"`
Expiry int64 `json:"expiry"`
ArchiveFiles []string `json:"archive_files,omitempty"`
}
func (b LocalfsBackend) Delete(key string) (err error) {
err = os.Remove(path.Join(b.filesPath, key))
if err != nil {
return
}
err = os.Remove(path.Join(b.metaPath, key))
return
}
func (b LocalfsBackend) Exists(key string) (bool, error) {
_, err := os.Stat(path.Join(b.filesPath, key))
return err == nil, err
}
func (b LocalfsBackend) Head(key string) (metadata backends.Metadata, err error) {
f, err := os.Open(path.Join(b.metaPath, key))
if os.IsNotExist(err) {
return metadata, backends.NotFoundErr
} else if err != nil {
return metadata, backends.BadMetadata
}
defer f.Close()
decoder := json.NewDecoder(f)
mjson := MetadataJSON{}
if err := decoder.Decode(&mjson); err != nil {
return metadata, backends.BadMetadata
}
metadata.DeleteKey = mjson.DeleteKey
metadata.AccessKey = mjson.AccessKey
metadata.Mimetype = mjson.Mimetype
metadata.ArchiveFiles = mjson.ArchiveFiles
metadata.Sha256sum = mjson.Sha256sum
metadata.Expiry = time.Unix(mjson.Expiry, 0)
metadata.Size = mjson.Size
return
}
func (b LocalfsBackend) Get(key string) (metadata backends.Metadata, f io.ReadCloser, err error) {
metadata, err = b.Head(key)
if err != nil {
return
}
f, err = os.Open(path.Join(b.filesPath, key))
if err != nil {
return
}
return
}
func (b LocalfsBackend) writeMetadata(key string, metadata backends.Metadata) error {
metaPath := path.Join(b.metaPath, key)
mjson := MetadataJSON{
DeleteKey: metadata.DeleteKey,
AccessKey: metadata.AccessKey,
Mimetype: metadata.Mimetype,
ArchiveFiles: metadata.ArchiveFiles,
Sha256sum: metadata.Sha256sum,
Expiry: metadata.Expiry.Unix(),
Size: metadata.Size,
}
dst, err := os.Create(metaPath)
if err != nil {
return err
}
defer dst.Close()
encoder := json.NewEncoder(dst)
err = encoder.Encode(mjson)
if err != nil {
os.Remove(metaPath)
return err
}
return nil
}
func (b LocalfsBackend) Put(key string, r io.Reader, expiry time.Time, deleteKey, accessKey string) (m backends.Metadata, err error) {
filePath := path.Join(b.filesPath, key)
dst, err := os.Create(filePath)
if err != nil {
return
}
defer dst.Close()
bytes, err := io.Copy(dst, r)
if bytes == 0 {
os.Remove(filePath)
return m, backends.FileEmptyError
} else if err != nil {
os.Remove(filePath)
return m, err
}
dst.Seek(0, 0)
m, err = helpers.GenerateMetadata(dst)
if err != nil {
os.Remove(filePath)
return
}
dst.Seek(0, 0)
m.Expiry = expiry
m.DeleteKey = deleteKey
m.AccessKey = accessKey
m.ArchiveFiles, _ = helpers.ListArchiveFiles(m.Mimetype, m.Size, dst)
err = b.writeMetadata(key, m)
if err != nil {
os.Remove(filePath)
return
}
return
}
func (b LocalfsBackend) PutMetadata(key string, m backends.Metadata) (err error) {
err = b.writeMetadata(key, m)
if err != nil {
return
}
return
}
func (b LocalfsBackend) Size(key string) (int64, error) {
fileInfo, err := os.Stat(path.Join(b.filesPath, key))
if err != nil {
return 0, err
}
return fileInfo.Size(), nil
}
func (b LocalfsBackend) List() ([]string, error) {
var output []string
files, err := ioutil.ReadDir(b.filesPath)
if err != nil {
return nil, err
}
for _, file := range files {
output = append(output, file.Name())
}
return output, nil
}
func NewLocalfsBackend(metaPath string, filesPath string) LocalfsBackend {
return LocalfsBackend{
metaPath: metaPath,
filesPath: filesPath,
}
}