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filelist.go
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filelist.go
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package dctoolkit
import (
"encoding/xml"
"fmt"
"path/filepath"
"strings"
)
// FileListFile is part of a user file list and represents a shared file.
type FileListFile struct {
Name string `xml:"Name,attr"`
Size uint64 `xml:"Size,attr"`
TTH TigerHash `xml:"TTH,attr"`
}
// FileListDirectory is part of a user file list and represents a shared drectory.
type FileListDirectory struct {
Name string `xml:"Name,attr"`
Files []*FileListFile `xml:"File"`
Dirs []*FileListDirectory `xml:"Directory"`
}
// FileList is a user file list, containing directories and files.
type FileList struct {
XMLName xml.Name `xml:"FileListing"`
Version string `xml:"Version,attr"`
CID string `xml:"CID,attr"`
Base string `xml:"Base,attr"`
Generator string `xml:"Generator,attr"`
Dirs []*FileListDirectory `xml:"Directory"`
}
// FileListParse parses a given user file list in XML format into a FileList struct.
func FileListParse(in []byte) (*FileList, error) {
fl := &FileList{}
err := xml.Unmarshal(in, fl)
if err != nil {
return nil, err
}
return fl, err
}
// GetDirectory returns the directory in the file list corresponding to the given path.
func (fl *FileList) GetDirectory(dpath string) (*FileListDirectory, error) {
components := strings.Split(strings.Trim(dpath, "/"), "/")
curDir, ok := func() (*FileListDirectory, bool) {
for _, d := range fl.Dirs {
if d.Name == components[0] {
return d, true
}
}
return nil, false
}()
if ok == false {
return nil, fmt.Errorf("directory not found")
}
components = components[1:]
for len(components) > 0 {
curDir, ok = func() (*FileListDirectory, bool) {
for _, d := range curDir.Dirs {
if d.Name == components[0] {
return d, true
}
}
return nil, false
}()
if ok == false {
return nil, fmt.Errorf("directory not found")
}
components = components[1:]
}
return curDir, nil
}
// GetFile returns the file in the file list corresponding to the given path.
func (fl *FileList) GetFile(fpath string) (*FileListFile, error) {
dpath, fname := filepath.Split(fpath)
dir, err := fl.GetDirectory(dpath)
if err != nil {
return nil, err
}
for _, f := range dir.Files {
if f.Name == fname {
return f, nil
}
}
return nil, fmt.Errorf("file not found")
}
// Export transform the FileList struct into a user file list in the XML format.
func (fl *FileList) Export() ([]byte, error) {
if fl.Version == "" {
fl.Version = "1"
}
if fl.CID == "" {
return nil, fmt.Errorf("CID is required")
}
if fl.Base == "" {
fl.Base = ""
}
if fl.Generator == "" {
return nil, fmt.Errorf("Generator is required")
}
out, err := xml.MarshalIndent(fl, "", " ")
if err != nil {
return nil, err
}
out = append([]byte(`<?xml version="1.0" encoding="utf-8" standalone="yes"?>`+"\n"), out...)
return out, nil
}