mirror of
https://github.com/pocketbase/pocketbase.git
synced 2025-03-23 07:06:18 +02:00
85 lines
2.6 KiB
Go
85 lines
2.6 KiB
Go
package fileblob
|
|
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
"os"
|
|
)
|
|
|
|
// Largely copied from gocloud.dev/blob/fileblob to apply the same
|
|
// retrieve and write side-car .attrs rules.
|
|
//
|
|
// -------------------------------------------------------------------
|
|
// Copyright 2018 The Go Cloud Development Kit Authors
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// https://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
// -------------------------------------------------------------------
|
|
|
|
const attrsExt = ".attrs"
|
|
|
|
var errAttrsExt = fmt.Errorf("file extension %q is reserved", attrsExt)
|
|
|
|
// xattrs stores extended attributes for an object. The format is like
|
|
// filesystem extended attributes, see
|
|
// https://www.freedesktop.org/wiki/CommonExtendedAttributes.
|
|
type xattrs struct {
|
|
CacheControl string `json:"user.cache_control"`
|
|
ContentDisposition string `json:"user.content_disposition"`
|
|
ContentEncoding string `json:"user.content_encoding"`
|
|
ContentLanguage string `json:"user.content_language"`
|
|
ContentType string `json:"user.content_type"`
|
|
Metadata map[string]string `json:"user.metadata"`
|
|
MD5 []byte `json:"md5"`
|
|
}
|
|
|
|
// setAttrs creates a "path.attrs" file along with blob to store the attributes,
|
|
// it uses JSON format.
|
|
func setAttrs(path string, xa xattrs) error {
|
|
f, err := os.Create(path + attrsExt)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := json.NewEncoder(f).Encode(xa); err != nil {
|
|
f.Close()
|
|
os.Remove(f.Name())
|
|
return err
|
|
}
|
|
|
|
return f.Close()
|
|
}
|
|
|
|
// getAttrs looks at the "path.attrs" file to retrieve the attributes and
|
|
// decodes them into a xattrs struct. It doesn't return error when there is no
|
|
// such .attrs file.
|
|
func getAttrs(path string) (xattrs, error) {
|
|
f, err := os.Open(path + attrsExt)
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
// Handle gracefully for non-existent .attr files.
|
|
return xattrs{
|
|
ContentType: "application/octet-stream",
|
|
}, nil
|
|
}
|
|
return xattrs{}, err
|
|
}
|
|
|
|
xa := new(xattrs)
|
|
if err := json.NewDecoder(f).Decode(xa); err != nil {
|
|
f.Close()
|
|
return xattrs{}, err
|
|
}
|
|
|
|
return *xa, f.Close()
|
|
}
|