seaweedfs/weed/storage/needle/needle_parse_multipart.go

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package needle
import (
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"github.com/joeslay/seaweedfs/weed/glog"
"github.com/joeslay/seaweedfs/weed/util"
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"io"
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"io/ioutil"
"mime"
"net/http"
"path"
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"strconv"
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"strings"
)
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func parseMultipart(r *http.Request) (
fileName string, data []byte, mimeType string, isGzipped bool, originalDataSize int, isChunkedFile bool, e error) {
defer func() {
if e != nil && r.Body != nil {
io.Copy(ioutil.Discard, r.Body)
r.Body.Close()
}
}()
form, fe := r.MultipartReader()
if fe != nil {
glog.V(0).Infoln("MultipartReader [ERROR]", fe)
e = fe
return
}
//first multi-part item
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
}
//if the filename is empty string, do a search on the other multi-part items
for fileName == "" {
part2, fe := form.NextPart()
if fe != nil {
break // no more or on error, just safely break
}
fName := part2.FileName()
//found the first <file type> multi-part has filename
if fName != "" {
data2, fe2 := ioutil.ReadAll(part2)
if fe2 != nil {
glog.V(0).Infoln("Reading Content [ERROR]", fe2)
e = fe2
return
}
//update
data = data2
fileName = path.Base(fName)
break
}
}
originalDataSize = len(data)
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isChunkedFile, _ = strconv.ParseBool(r.FormValue("cm"))
if !isChunkedFile {
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" {
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if unzipped, e := util.UnGzipData(data); e == nil {
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originalDataSize = len(unzipped)
}
isGzipped = true
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} else if util.IsGzippable(ext, mtype, data) {
if compressedData, err := util.GzipData(data); err == nil {
if len(data) > len(compressedData) {
data = compressedData
isGzipped = true
}
}
}
}
return
}