andreimarcu
9 years ago
7 changed files with 228 additions and 172 deletions
-
5delete.go
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115display.go
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10expiry.go
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21fileserve.go
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198meta.go
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6torrent.go
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41upload.go
@ -1,84 +1,188 @@ |
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package main |
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|
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import ( |
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"bufio" |
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"archive/tar" |
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"archive/zip" |
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"compress/bzip2" |
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"compress/gzip" |
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"crypto/sha256" |
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"encoding/hex" |
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"encoding/json" |
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"errors" |
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"fmt" |
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"io" |
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"io/ioutil" |
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"os" |
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"path" |
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"strconv" |
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"sort" |
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"time" |
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) |
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|
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// Write metadata from Upload struct to file
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func metadataWrite(filename string, upload *Upload) error { |
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// Write metadata, overwriting if necessary
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"bitbucket.org/taruti/mimemagic" |
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"github.com/dchest/uniuri" |
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) |
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|
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file, err := os.Create(path.Join(Config.metaDir, upload.Filename)) |
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if err != nil { |
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return err |
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type MetadataJSON struct { |
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DeleteKey string `json:"delete_key"` |
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Sha256sum string `json:"sha256sum"` |
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Mimetype string `json:"mimetype"` |
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Size int64 `json:"size"` |
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Expiry int64 `json:"expiry"` |
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ArchiveFiles []string `json:"archive_files,omitempty"` |
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} |
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|
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defer file.Close() |
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|
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w := bufio.NewWriter(file) |
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type Metadata struct { |
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DeleteKey string |
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Sha256sum string |
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Mimetype string |
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Size int64 |
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Expiry time.Time |
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ArchiveFiles []string |
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} |
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|
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fmt.Fprintln(w, upload.Expiry.Unix()) |
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fmt.Fprintln(w, upload.DeleteKey) |
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var NotFoundErr = errors.New("File not found.") |
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var BadMetadata = errors.New("Corrupted metadata.") |
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return w.Flush() |
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func generateMetadata(fName string, exp time.Time, delKey string) (m Metadata, err error) { |
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file, err := os.Open(path.Join(Config.filesDir, fName)) |
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fileInfo, err := os.Stat(path.Join(Config.filesDir, fName)) |
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if err != nil { |
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return |
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} |
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defer file.Close() |
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|
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// Return list of strings from a filename's metadata source
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func metadataRead(filename string) ([]string, error) { |
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file, err := os.Open(path.Join(Config.metaDir, filename)) |
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m.Size = fileInfo.Size() |
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m.Expiry = exp |
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|
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if err != nil { |
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return nil, err |
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if delKey == "" { |
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m.DeleteKey = uniuri.NewLen(30) |
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} else { |
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m.DeleteKey = delKey |
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} |
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defer file.Close() |
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// Get first 512 bytes for mimetype detection
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header := make([]byte, 512) |
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file.Read(header) |
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|
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var lines []string |
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scanner := bufio.NewScanner(file) |
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for scanner.Scan() { |
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lines = append(lines, scanner.Text()) |
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m.Mimetype = mimemagic.Match("", header) |
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|
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// Compute the sha256sum
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hasher := sha256.New() |
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file.Seek(0, 0) |
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_, err = io.Copy(hasher, file) |
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if err == nil { |
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m.Sha256sum = hex.EncodeToString(hasher.Sum(nil)) |
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} |
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file.Seek(0, 0) |
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|
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// If archive, grab list of filenames
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if m.Mimetype == "application/x-tar" { |
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tReadr := tar.NewReader(file) |
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for { |
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hdr, err := tReadr.Next() |
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if err == io.EOF || err != nil { |
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break |
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} |
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if hdr.Typeflag == tar.TypeDir || hdr.Typeflag == tar.TypeReg { |
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m.ArchiveFiles = append(m.ArchiveFiles, hdr.Name) |
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} |
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} |
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sort.Strings(m.ArchiveFiles) |
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} else if m.Mimetype == "application/x-gzip" { |
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gzf, err := gzip.NewReader(file) |
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if err == nil { |
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tReadr := tar.NewReader(gzf) |
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for { |
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hdr, err := tReadr.Next() |
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if err == io.EOF || err != nil { |
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break |
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} |
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if hdr.Typeflag == tar.TypeDir || hdr.Typeflag == tar.TypeReg { |
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m.ArchiveFiles = append(m.ArchiveFiles, hdr.Name) |
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} |
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} |
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sort.Strings(m.ArchiveFiles) |
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} |
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} else if m.Mimetype == "application/x-bzip" { |
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bzf := bzip2.NewReader(file) |
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tReadr := tar.NewReader(bzf) |
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for { |
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hdr, err := tReadr.Next() |
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if err == io.EOF || err != nil { |
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break |
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} |
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if hdr.Typeflag == tar.TypeDir || hdr.Typeflag == tar.TypeReg { |
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m.ArchiveFiles = append(m.ArchiveFiles, hdr.Name) |
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} |
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} |
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sort.Strings(m.ArchiveFiles) |
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} else if m.Mimetype == "application/zip" { |
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zf, err := zip.NewReader(file, m.Size) |
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if err == nil { |
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for _, f := range zf.File { |
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m.ArchiveFiles = append(m.ArchiveFiles, f.Name) |
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} |
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} |
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sort.Strings(m.ArchiveFiles) |
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} |
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return lines, scanner.Err() |
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return |
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} |
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|
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func metadataGetExpiry(filename string) (expiry time.Time, err error) { |
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metadata, err := metadataRead(filename) |
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func metadataWrite(filename string, metadata *Metadata) error { |
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file, err := os.Create(path.Join(Config.metaDir, filename)) |
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if err != nil { |
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return err |
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} |
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defer file.Close() |
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// XXX in this case it's up to the caller to determine proper behavior
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// for a nonexistant metadata file or broken file
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mjson := MetadataJSON{} |
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mjson.DeleteKey = metadata.DeleteKey |
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mjson.Mimetype = metadata.Mimetype |
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mjson.ArchiveFiles = metadata.ArchiveFiles |
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mjson.Sha256sum = metadata.Sha256sum |
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mjson.Expiry = metadata.Expiry.Unix() |
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mjson.Size = metadata.Size |
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byt, err := json.Marshal(mjson) |
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if err != nil { |
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return |
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return err |
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} |
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if len(metadata) < 1 { |
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err = errors.New("ERR: Metadata file does not contain expiry") |
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return |
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_, err = file.Write(byt) |
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if err != nil { |
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return err |
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} |
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expirySecs, err := strconv.ParseInt(metadata[0], 10, 64) |
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expiry = time.Unix(expirySecs, 0) |
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return |
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return nil |
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} |
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|
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func metadataGetDeleteKey(filename string) (string, error) { |
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metadata, err := metadataRead(filename) |
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|
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if len(metadata) < 2 { |
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err := errors.New("ERR: Metadata file does not contain deletion key") |
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return "", err |
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func metadataRead(filename string) (metadata Metadata, err error) { |
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b, err := ioutil.ReadFile(path.Join(Config.metaDir, filename)) |
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if err != nil { |
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// Metadata does not exist, generate one
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newMData, err := generateMetadata(filename, neverExpire, "") |
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if err != nil { |
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return metadata, err |
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} |
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metadataWrite(filename, &newMData) |
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b, err = ioutil.ReadFile(path.Join(Config.metaDir, filename)) |
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if err != nil { |
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return metadata, BadMetadata |
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} |
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} |
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mjson := MetadataJSON{} |
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err = json.Unmarshal(b, &mjson) |
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if err != nil { |
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return "", err |
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} else { |
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return metadata[1], err |
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return metadata, BadMetadata |
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} |
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metadata.DeleteKey = mjson.DeleteKey |
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metadata.Mimetype = mjson.Mimetype |
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metadata.ArchiveFiles = mjson.ArchiveFiles |
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metadata.Sha256sum = mjson.Sha256sum |
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metadata.Expiry = time.Unix(mjson.Expiry, 0) |
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metadata.Size = mjson.Size |
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return |
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} |
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