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|
package http
import (
"encoding/json"
"fmt"
"io"
"io/ioutil"
"mime/multipart"
"net/http"
"os"
"strings"
"sync"
)
const (
// There is no error, the file uploaded with success.
UploadErrorOK = 0
// No file was uploaded.
UploadErrorNoFile = 4
// Missing a temporary folder.
UploadErrorNoTmpDir = 5
// Failed to write file to disk.
UploadErrorCantWrite = 6
// ForbidUploads file extension.
UploadErrorExtension = 7
)
// FileUpload represents singular file wrapUpload.
type FileUpload struct {
// Name contains filename specified by the client.
Name string `json:"name"`
// MimeType contains mime-type provided by the client.
MimeType string `json:"type"`
// Size of the uploaded file.
Size int64 `json:"size"`
// Error indicates file upload error (if any). See http://php.net/manual/en/features.file-upload.errors.php
Error int `json:"error"`
// TempFilename points to temporary file location.
TempFilename string `json:"tmpName"`
// associated file header
header *multipart.FileHeader
}
func (f *FileUpload) Open(cfg *Config) error {
if cfg.Forbidden(f.Name) {
f.Error = UploadErrorExtension
return nil
}
file, err := f.header.Open()
if err != nil {
f.Error = UploadErrorNoFile
return err
}
defer file.Close()
tmp, err := ioutil.TempFile(cfg.TmpDir, "upload")
if err != nil {
// most likely cause of this issue is missing tmp dir
f.Error = UploadErrorNoTmpDir
return err
}
f.TempFilename = tmp.Name()
defer tmp.Close()
if f.Size, err = io.Copy(tmp, file); err != nil {
f.Error = UploadErrorCantWrite
}
return err
}
func wrapUpload(f *multipart.FileHeader) *FileUpload {
return &FileUpload{
Name: f.Filename,
MimeType: f.Header.Get("Content-Type"),
Error: UploadErrorOK,
header: f,
}
}
type fileTree map[string]interface{}
func (d fileTree) push(k string, v []*FileUpload) {
if len(v) == 0 {
// skip empty values
return
}
indexes := make([]string, 0)
for _, index := range strings.Split(k, "[") {
indexes = append(indexes, strings.Trim(index, "]"))
}
if len(indexes) <= maxLevel {
d.mount(indexes, v)
}
}
// mount mounts data tree recursively.
func (d fileTree) mount(i []string, v []*FileUpload) {
if len(v) == 0 {
return
}
if len(i) == 1 {
// single value context
d[i[0]] = v[0]
return
}
if len(i) == 2 && i[1] == "" {
// non associated array of elements
d[i[0]] = v
return
}
if p, ok := d[i[0]]; ok {
p.(fileTree).mount(i[1:], v)
}
d[i[0]] = make(fileTree)
d[i[0]].(fileTree).mount(i[1:], v)
}
// tree manages uploaded files tree and temporary files.
type Uploads struct {
// pre processed data tree for Uploads.
tree fileTree
// flat list of all file Uploads.
list []*FileUpload
}
// MarshalJSON marshal tree tree into JSON.
func (u *Uploads) MarshalJSON() ([]byte, error) {
return json.Marshal(u.tree)
}
// Open moves all uploaded files to temp directory, return error in case of issue with temp directory. File errors
// will be handled individually. @todo: do we need it?
func (u *Uploads) Open(cfg *Config) error {
var wg sync.WaitGroup
for _, f := range u.list {
wg.Add(1)
go func(f *FileUpload) {
defer wg.Done()
f.Open(cfg)
}(f)
}
wg.Wait()
return nil
}
// Clear deletes all temporary files.
func (u *Uploads) Clear() {
for _, f := range u.list {
if f.TempFilename != "" && exists(f.TempFilename) {
os.Remove(f.TempFilename)
}
}
}
// parse incoming dataTree request into JSON (including multipart form dataTree)
func parseUploads(r *http.Request) (*Uploads, error) {
u := &Uploads{
tree: make(fileTree),
list: make([]*FileUpload, 0),
}
for k, v := range r.MultipartForm.File {
files := make([]*FileUpload, 0, len(v))
for _, f := range v {
files = append(files, wrapUpload(f))
}
u.list = append(u.list, files...)
u.tree.push(k, files)
}
return u, nil
}
// exists if file exists. by osutils; todo: better?
func exists(path string) bool {
_, err := os.Stat(path)
if err == nil {
return true
}
if os.IsNotExist(err) {
return false
}
panic(fmt.Errorf("unable to stat path %q; %v", path, err))
}
|
