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vfs.go
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vfs.go
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/*
* Copyright 2020 Josselin Pujo
*
* 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
*
* http://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.
*
*/
package luabox
import (
"encoding/hex"
"hash/fnv"
"io"
"strings"
"time"
)
type VFS struct {
BaseFs Filesystem
Prefixes map[string]Filesystem
}
func (vfs *VFS) getFs(file string) (string, Filesystem) {
split := strings.Split(file, "/")
if len(split) < 2 {
return file, vfs.BaseFs
} else {
prefix := split[0]
fs, ok := vfs.Prefixes[prefix]
if ok {
newPath := strings.Join(split[1:], "/")
return newPath, fs
} else {
return file, vfs.BaseFs
}
}
}
func (vfs *VFS) GetReader(file string) (io.ReadCloser, error) {
file2, fs := vfs.getFs(file)
return fs.GetReader(file2)
}
func (vfs *VFS) GetWriter(file string) (io.WriteCloser, error) {
file2, fs := vfs.getFs(file)
return fs.GetWriter(file2)
}
var utc, _ = time.LoadLocation("UTC")
var baseTime = time.Date(1970, time.January, 1, 0, 0, 0, 0, utc)
func (vfs *VFS) List(file string) ([]FileInfo, error) {
if file == "/" || file == "" {
list, err := vfs.BaseFs.List("/")
if err != nil {
return nil, err
}
for p := range vfs.Prefixes {
etag := fnv.New64a()
_, err := etag.Write([]byte(p))
if err != nil {
panic(err)
}
direntry := FileInfo{
IsDir: true,
Name: p,
SelfUrl: "/" + p,
Size: 0,
ETag: hex.EncodeToString(etag.Sum([]byte{})),
LastModified: baseTime}
list = append(list, direntry)
}
return list, nil
}
file2, fs := vfs.getFs(file)
return fs.List(file2)
}
func (vfs *VFS) Delete(file string) error {
file2, fs := vfs.getFs(file)
return fs.Delete(file2)
}