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upload.go
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upload.go
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package serverHandler
import (
"../util"
"errors"
"io"
"net/http"
"os"
"path"
"strconv"
"strings"
)
const file = "file"
const dirFile = "dirfile"
const innerDirFile = "innerdirfile"
func getAvailableFilename(fsPrefix, filename string, mustAppendSuffix bool) string {
if len(fsPrefix) == 0 {
fsPrefix = "/"
} else if fsPrefix[len(fsPrefix)-1] != '/' {
fsPrefix = fsPrefix + "/"
}
if !mustAppendSuffix {
if _, err := os.Lstat(fsPrefix + filename); os.IsNotExist(err) {
return filename
}
}
filenamePrefix, filenameSuffix := util.SplitFilename(filename)
for i := 1; ; i++ {
newFilename := filenamePrefix + "-" + strconv.Itoa(i) + filenameSuffix
if _, err := os.Lstat(fsPrefix + newFilename); os.IsNotExist(err) {
return newFilename
}
}
return ""
}
func (h *handler) saveUploadFiles(fsPrefix string, createDir, overwriteExists bool, aliasSubItems []os.FileInfo, r *http.Request) bool {
errs := []error{}
reader, err := r.MultipartReader()
if err != nil {
errs = append(errs, err)
return false
}
for {
part, err := reader.NextPart()
if err != nil {
if err != io.EOF {
errs = append(errs, err)
}
break
}
inputPartFilename := part.FileName()
if len(inputPartFilename) == 0 {
continue
}
partFilename, ok := getCleanDirFilePath(inputPartFilename)
if !ok {
errs = append(errs, errors.New("upload: illegal file name "+inputPartFilename))
continue
}
slashIndex := strings.LastIndexByte(partFilename, '/')
fsInfix := ""
formname := part.FormName()
if formname == dirFile {
if slashIndex <= 0 {
continue
}
fsInfix = partFilename[0:slashIndex]
} else if formname == innerDirFile { // get file path, strip first level of dir
if slashIndex <= 0 {
continue
}
filepath := partFilename[0:slashIndex]
prefixSlashIndex := strings.IndexByte(filepath, '/')
if prefixSlashIndex > 0 {
fsInfix = filepath[prefixSlashIndex+1:]
}
}
filePrefix := fsPrefix
if len(fsInfix) > 0 {
if !createDir {
errs = append(errs, errors.New("Upload failed: mkdir is not enabled for "+fsPrefix))
continue
}
filePrefix = fsPrefix + "/" + fsInfix
err := os.MkdirAll(filePrefix, 0755)
if err != nil {
errs = append(errs, err)
continue
}
}
filename := partFilename
if slashIndex >= 0 {
filename = filename[slashIndex+1:]
}
if len(filename) == 0 {
continue
}
isFilenameAliased := containsItem(aliasSubItems, filename)
var fsFilename string
if overwriteExists && !isFilenameAliased {
tryPath := filePrefix + "/" + filename
var info os.FileInfo
info, err = os.Lstat(tryPath)
if info != nil && !info.IsDir() {
err = os.Remove(tryPath)
if err != nil && !os.IsNotExist(err) {
errs = append(errs, err)
}
// even remove failed, still try to write content to file by TRUNCATE mode
fsFilename = filename
}
}
if len(fsFilename) == 0 {
fsFilename = getAvailableFilename(filePrefix, filename, isFilenameAliased)
}
if len(fsFilename) == 0 {
err := errors.New("no available filename for " + filename)
errs = append(errs, err)
continue
}
fsPath := path.Clean(filePrefix + "/" + fsFilename)
go h.logUpload(filename, fsPath, r)
file, err := os.OpenFile(fsPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0666)
if err != nil {
errs = append(errs, err)
continue
}
_, err = io.Copy(file, part)
if err != nil {
errs = append(errs, err)
}
err = file.Close()
if err != nil {
errs = append(errs, err)
}
}
if len(errs) > 0 {
go h.logger.LogErrors(errs...)
return false
}
return true
}