// FixContentType ensures proper content-type
// (uses mimemagic for "" and application/octet-stream)
func FixContentType(body []byte, contentType, fileName string) string {
switch contentType {
case "application/x-zip-compressed":
return "application/zip"
case "application/x-rar-compressed":
return "application/rar"
case "", "application/octet-stream", "application/pdf", "application/x-as400attachment", "application/save-as":
//log.Printf("body=%s", body)
if nct := mimemagic.Match(contentType, body); nct != "" {
return nct
}
}
if GetConverter(contentType, nil) == nil { // no converter for this
if nct := mimemagic.Match(contentType, body); nct != "" {
return nct
}
}
if fileName != "" &&
(contentType == "" || contentType == "application/octet-stream" ||
GetConverter(contentType, nil) == nil) {
if i := strings.LastIndex(fileName, "."); i >= 0 {
if nct, ok := ExtContentType[fileName[i+1:]]; ok {
return nct
}
if nct := mime.TypeByExtension(fileName[i:]); nct != "" {
return nct
}
}
}
//log.Printf("ct=%s ==> %s", ct, contentType)
return contentType
}
func guessMime(path string, buf []byte) string {
s := mimemagic.Match("", buf)
if s == "" {
s = mime.TypeByExtension(filepath.Ext(path))
}
for _, extension := range TextFileExtensions {
if extension == filepath.Ext(path) {
return "text/generic"
}
}
return s
}
func main() {
b := make([]byte, 1024)
for _, fn := range os.Args {
f, e := os.Open(fn)
if e != nil {
panic(e)
}
f.Read(b)
fmt.Printf("%-30s %s\n", mimemagic.Match("", b), fn)
f.Close()
}
}
func processUpload(upReq UploadRequest) (upload Upload, err error) {
// Determine the appropriate filename, then write to disk
barename, extension := barePlusExt(upReq.filename)
if upReq.randomBarename || len(barename) == 0 {
barename = generateBarename()
}
var header []byte
if len(extension) == 0 {
// Pull the first 512 bytes off for use in MIME detection
header = make([]byte, 512)
n, _ := upReq.src.Read(header)
if n == 0 {
return upload, errors.New("Empty file")
}
header = header[:n]
// Determine the type of file from header
mimetype := mimemagic.Match("", header)
// If the mime type is in our map, use that
// otherwise just use "ext"
if val, exists := mimeToExtension[mimetype]; exists {
extension = val
} else {
extension = "ext"
}
}
upload.Filename = strings.Join([]string{barename, extension}, ".")
_, err = os.Stat(path.Join(Config.filesDir, upload.Filename))
fileexists := err == nil
// Check if the delete key matches, in which case overwrite
if fileexists {
metad, merr := metadataRead(upload.Filename)
if merr == nil {
if upReq.deletionKey == metad.DeleteKey {
fileexists = false
}
}
}
for fileexists {
counter, err := strconv.Atoi(string(barename[len(barename)-1]))
if err != nil {
barename = barename + "1"
} else {
barename = barename[:len(barename)-1] + strconv.Itoa(counter+1)
}
upload.Filename = strings.Join([]string{barename, extension}, ".")
_, err = os.Stat(path.Join(Config.filesDir, upload.Filename))
fileexists = err == nil
}
if fileBlacklist[strings.ToLower(upload.Filename)] {
return upload, errors.New("Prohibited filename")
}
dst, err := os.Create(path.Join(Config.filesDir, upload.Filename))
if err != nil {
return
}
defer dst.Close()
// Get the rest of the metadata needed for storage
var expiry time.Time
if upReq.expiry == 0 {
expiry = neverExpire
} else {
expiry = time.Now().Add(upReq.expiry)
}
bytes, err := io.Copy(dst, io.MultiReader(bytes.NewReader(header), upReq.src))
if bytes == 0 {
os.Remove(path.Join(Config.filesDir, upload.Filename))
return upload, errors.New("Empty file")
} else if err != nil {
os.Remove(path.Join(Config.filesDir, upload.Filename))
return
} else if bytes > Config.maxSize {
os.Remove(path.Join(Config.filesDir, upload.Filename))
return upload, errors.New("File too large")
}
upload.Metadata, err = generateMetadata(upload.Filename, expiry, upReq.deletionKey)
if err != nil {
os.Remove(path.Join(Config.filesDir, upload.Filename))
os.Remove(path.Join(Config.metaDir, upload.Filename))
return
}
err = metadataWrite(upload.Filename, &upload.Metadata)
if err != nil {
os.Remove(path.Join(Config.filesDir, upload.Filename))
os.Remove(path.Join(Config.metaDir, upload.Filename))
return
}
return
}
func fileDisplayHandler(c web.C, w http.ResponseWriter, r *http.Request) {
fileName := c.URLParams["name"]
filePath := path.Join(Config.filesDir, fileName)
fileInfo, err := os.Stat(filePath)
if !fileExistsAndNotExpired(fileName) {
notFoundHandler(c, w, r)
return
}
expiry, _ := metadataGetExpiry(fileName)
var expiryHuman string
if !expiry.IsZero() {
expiryHuman = humanize.RelTime(time.Now(), expiry, "", "")
}
sizeHuman := humanize.Bytes(uint64(fileInfo.Size()))
extra := make(map[string]string)
file, _ := os.Open(filePath)
header := make([]byte, 512)
file.Read(header)
file.Close()
mimetype := mimemagic.Match("", header)
extension := strings.TrimPrefix(filepath.Ext(fileName), ".")
if strings.EqualFold("application/json", r.Header.Get("Accept")) {
js, _ := json.Marshal(map[string]string{
"filename": fileName,
"mimetype": mimetype,
"expiry": strconv.FormatInt(expiry.Unix(), 10),
"size": strconv.FormatInt(fileInfo.Size(), 10),
})
w.Write(js)
return
}
var tpl *pongo2.Template
if strings.HasPrefix(mimetype, "image/") {
tpl = Templates["display/image.html"]
} else if strings.HasPrefix(mimetype, "video/") {
tpl = Templates["display/video.html"]
} else if strings.HasPrefix(mimetype, "audio/") {
tpl = Templates["display/audio.html"]
} else if mimetype == "application/pdf" {
tpl = Templates["display/pdf.html"]
} else if supportedBinExtension(extension) {
if fileInfo.Size() < maxDisplayFileSizeBytes {
bytes, err := ioutil.ReadFile(filePath)
if err != nil {
tpl = Templates["display/file.html"]
} else {
extra["extension"] = extension
extra["lang_hl"], extra["lang_ace"] = extensionToHlAndAceLangs(extension)
extra["contents"] = string(bytes)
tpl = Templates["display/bin.html"]
}
} else {
tpl = Templates["display/file.html"]
}
} else {
tpl = Templates["display/file.html"]
}
err = tpl.ExecuteWriter(pongo2.Context{
"mime": mimetype,
"filename": fileName,
"size": sizeHuman,
"expiry": expiryHuman,
"extra": extra,
}, w)
if err != nil {
oopsHandler(c, w, r, RespHTML, "")
}
}
func generateMetadata(fName string, exp time.Time, delKey string) (m Metadata, err error) {
file, err := fileBackend.Open(fName)
if err != nil {
return
}
defer file.Close()
m.Size, err = fileBackend.Size(fName)
if err != nil {
return
}
m.Expiry = exp
if delKey == "" {
m.DeleteKey = uniuri.NewLen(30)
} else {
m.DeleteKey = delKey
}
// Get first 512 bytes for mimetype detection
header := make([]byte, 512)
file.Read(header)
m.Mimetype = mimemagic.Match("", header)
if m.Mimetype == "" {
// Check if the file seems anything like text
if printable(header) {
m.Mimetype = "text/plain"
} else {
m.Mimetype = "application/octet-stream"
}
}
// Compute the sha256sum
hasher := sha256.New()
file.Seek(0, 0)
_, err = io.Copy(hasher, file)
if err == nil {
m.Sha256sum = hex.EncodeToString(hasher.Sum(nil))
}
file.Seek(0, 0)
// If archive, grab list of filenames
if m.Mimetype == "application/x-tar" {
tReadr := tar.NewReader(file)
for {
hdr, err := tReadr.Next()
if err == io.EOF || err != nil {
break
}
if hdr.Typeflag == tar.TypeDir || hdr.Typeflag == tar.TypeReg {
m.ArchiveFiles = append(m.ArchiveFiles, hdr.Name)
}
}
sort.Strings(m.ArchiveFiles)
} else if m.Mimetype == "application/x-gzip" {
gzf, err := gzip.NewReader(file)
if err == nil {
tReadr := tar.NewReader(gzf)
for {
hdr, err := tReadr.Next()
if err == io.EOF || err != nil {
break
}
if hdr.Typeflag == tar.TypeDir || hdr.Typeflag == tar.TypeReg {
m.ArchiveFiles = append(m.ArchiveFiles, hdr.Name)
}
}
sort.Strings(m.ArchiveFiles)
}
} else if m.Mimetype == "application/x-bzip" {
bzf := bzip2.NewReader(file)
tReadr := tar.NewReader(bzf)
for {
hdr, err := tReadr.Next()
if err == io.EOF || err != nil {
break
}
if hdr.Typeflag == tar.TypeDir || hdr.Typeflag == tar.TypeReg {
m.ArchiveFiles = append(m.ArchiveFiles, hdr.Name)
}
}
sort.Strings(m.ArchiveFiles)
} else if m.Mimetype == "application/zip" {
zf, err := zip.NewReader(file, m.Size)
if err == nil {
for _, f := range zf.File {
m.ArchiveFiles = append(m.ArchiveFiles, f.Name)
}
}
sort.Strings(m.ArchiveFiles)
}
return
}
func processUpload(upReq UploadRequest) (upload Upload, err error) {
// Determine the appropriate filename, then write to disk
barename, extension := barePlusExt(upReq.filename)
if upReq.randomBarename || len(barename) == 0 {
barename = generateBarename()
}
var header []byte
if len(extension) == 0 {
// Pull the first 512 bytes off for use in MIME detection
header = make([]byte, 512)
n, err := upReq.src.Read(header)
if n == 0 || err != nil {
return upload, errors.New("Empty file")
}
header = header[:n]
// Determine the type of file from header
mimetype := mimemagic.Match("", header)
// If the mime type is in our map, use that
// otherwise just use "ext"
if val, exists := mimeToExtension[mimetype]; exists {
extension = val
} else {
extension = "ext"
}
}
upload.Filename = strings.Join([]string{barename, extension}, ".")
_, err = os.Stat(path.Join(Config.filesDir, upload.Filename))
fileexists := err == nil
for fileexists {
counter, err := strconv.Atoi(string(barename[len(barename)-1]))
if err != nil {
barename = barename + "1"
} else {
barename = barename[:len(barename)-1] + strconv.Itoa(counter+1)
}
upload.Filename = strings.Join([]string{barename, extension}, ".")
_, err = os.Stat(path.Join(Config.filesDir, upload.Filename))
fileexists = err == nil
}
if fileBlacklist[strings.ToLower(upload.Filename)] {
return upload, errors.New("Prohibited filename")
}
dst, err := os.Create(path.Join(Config.filesDir, upload.Filename))
if err != nil {
return
}
defer dst.Close()
// Get the rest of the metadata needed for storage
if upReq.expiry != 0 {
upload.Expiry = time.Now().Add(upReq.expiry)
}
// If no delete key specified, pick a random one.
if upReq.deletionKey == "" {
upload.DeleteKey = uniuri.NewLen(30)
} else {
upload.DeleteKey = upReq.deletionKey
}
metadataWrite(upload.Filename, &upload)
bytes, err := io.Copy(dst, io.MultiReader(bytes.NewReader(header), upReq.src))
if bytes == 0 {
os.Remove(path.Join(Config.filesDir, upload.Filename))
os.Remove(path.Join(Config.metaDir, upload.Filename))
return upload, errors.New("Empty file")
} else if err != nil {
os.Remove(path.Join(Config.filesDir, upload.Filename))
os.Remove(path.Join(Config.metaDir, upload.Filename))
return
}
upload.Size = bytes
return
}
func detectContentType(sample []byte) (string, error) {
return mimemagic.Match("", sample), nil
}
