1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
package storage
import (
"code.google.com/p/weed-fs/go/glog"
"code.google.com/p/weed-fs/go/util"
"encoding/hex"
"errors"
"io/ioutil"
"mime"
"net/http"
"path"
"strconv"
"strings"
"time"
)
const (
NeedleHeaderSize = 16 //should never change this
NeedlePaddingSize = 8
NeedleChecksumSize = 4
MaxPossibleVolumeSize = 4 * 1024 * 1024 * 1024 * 8
)
/*
* 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]
}
e = n.ParsePath(fid)
return
}
func (n *Needle) ParsePath(fid string) (err error) {
length := len(fid)
if length <= 8 {
return errors.New("Invalid fid:" + fid)
}
delta := ""
deltaIndex := strings.LastIndex(fid, "_")
if deltaIndex > 0 {
fid, delta = fid[0:deltaIndex], fid[deltaIndex+1:]
}
n.Id, n.Cookie, err = ParseKeyHash(fid)
if err != nil {
return err
}
if delta != "" {
if d, e := strconv.ParseUint(delta, 10, 64); e == nil {
n.Id += d
} else {
return e
}
}
return err
}
func ParseKeyHash(key_hash_string string) (uint64, uint32, error) {
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, errors.New("Invalid key and hash:" + key_hash_string)
}
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, nil
}
|
