package storage import ( "code.google.com/p/weed-fs/go/glog" "code.google.com/p/weed-fs/go/util" "encoding/hex" "io/ioutil" "mime" "net/http" "path" "strconv" "strings" "time" ) const ( NeedleHeaderSize = 16 //should never change this NeedlePaddingSize = 8 NeedleChecksumSize = 4 ) /* * Needle file size is limited to 4GB for now. */ type Needle struct { Cookie uint32 `comment:"random number to mitigate brute force lookups"` Id uint64 `comment:"needle id"` Size uint32 `comment:"sum of DataSize,Data,NameSize,Name,MimeSize,Mime"` DataSize uint32 `comment:"Data size"` //version2 Data []byte `comment:"The actual file data"` Flags byte `comment:"boolean flags"` //version2 NameSize uint8 //version2 Name []byte `comment:"maximum 256 characters"` //version2 MimeSize uint8 //version2 Mime []byte `comment:"maximum 256 characters"` //version2 LastModified uint64 //only store LastModifiedBytesLength bytes, which is 5 bytes to disk Checksum CRC `comment:"CRC32 to check integrity"` Padding []byte `comment:"Aligned to 8 bytes"` } func ParseUpload(r *http.Request) (fileName string, data []byte, mimeType string, isGzipped bool, modifiedTime uint64, e error) { form, fe := r.MultipartReader() if fe != nil { glog.V(0).Infoln("MultipartReader [ERROR]", fe) e = fe return } part, fe := form.NextPart() if fe != nil { glog.V(0).Infoln("Reading Multi part [ERROR]", fe) e = fe return } fileName = part.FileName() if fileName != "" { fileName = path.Base(fileName) } data, e = ioutil.ReadAll(part) if e != nil { glog.V(0).Infoln("Reading Content [ERROR]", e) return } dotIndex := strings.LastIndex(fileName, ".") ext, mtype := "", "" if dotIndex > 0 { ext = strings.ToLower(fileName[dotIndex:]) mtype = mime.TypeByExtension(ext) } contentType := part.Header.Get("Content-Type") if contentType != "" && mtype != contentType { mimeType = contentType //only return mime type if not deductable mtype = contentType } if part.Header.Get("Content-Encoding") == "gzip" { isGzipped = true } else if IsGzippable(ext, mtype) { if data, e = GzipData(data); e != nil { return } isGzipped = true } if ext == ".gz" { isGzipped = true } if strings.HasSuffix(fileName, ".gz") { fileName = fileName[:len(fileName)-3] } modifiedTime, _ = strconv.ParseUint(r.FormValue("ts"), 10, 64) return } func NewNeedle(r *http.Request) (n *Needle, e error) { fname, mimeType, isGzipped := "", "", false n = new(Needle) fname, n.Data, mimeType, isGzipped, n.LastModified, e = ParseUpload(r) if e != nil { return } if len(fname) < 256 { n.Name = []byte(fname) n.SetHasName() } if len(mimeType) < 256 { n.Mime = []byte(mimeType) n.SetHasMime() } if isGzipped { n.SetGzipped() } if n.LastModified == 0 { n.LastModified = uint64(time.Now().Unix()) } n.SetHasLastModifiedDate() n.Checksum = NewCRC(n.Data) commaSep := strings.LastIndex(r.URL.Path, ",") dotSep := strings.LastIndex(r.URL.Path, ".") fid := r.URL.Path[commaSep+1:] if dotSep > 0 { fid = r.URL.Path[commaSep+1 : dotSep] } n.ParsePath(fid) return } func (n *Needle) ParsePath(fid string) { length := len(fid) if length <= 8 { return } delta := "" deltaIndex := strings.LastIndex(fid, "_") if deltaIndex > 0 { fid, delta = fid[0:deltaIndex], fid[deltaIndex+1:] } n.Id, n.Cookie = ParseKeyHash(fid) if delta != "" { d, e := strconv.ParseUint(delta, 10, 64) if e == nil { n.Id += d } } } func ParseKeyHash(key_hash_string string) (uint64, uint32) { key_hash_bytes, khe := hex.DecodeString(key_hash_string) key_hash_len := len(key_hash_bytes) if khe != nil || key_hash_len <= 4 { glog.V(0).Infoln("Invalid key_hash", key_hash_string, "length:", key_hash_len, "error", khe) return 0, 0 } key := util.BytesToUint64(key_hash_bytes[0 : key_hash_len-4]) hash := util.BytesToUint32(key_hash_bytes[key_hash_len-4 : key_hash_len]) return key, hash }