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package http
import (
"mime/multipart"
"encoding/json"
"log"
"strings"
"net/http"
"io/ioutil"
"io"
"sync"
)
// 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:"mimetype"`
// 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
// TempFilename points to temporary file location.
TempFilename string `json:"tempFilename"`
// associated file header
header *multipart.FileHeader
}
func (f *FileUpload) Open(tmpDir string) error {
file, err := f.header.Open()
if err != nil {
return err
}
defer file.Close()
tmp, err := ioutil.TempFile(tmpDir, "upload")
if err != nil {
return err
}
f.TempFilename = tmp.Name()
defer tmp.Close()
f.Size, err = io.Copy(tmp, file)
return err
}
func wrapUpload(f *multipart.FileHeader) *FileUpload {
log.Print(f.Header)
return &FileUpload{
Name: f.Filename,
MimeType: f.Header.Get("Content-Type"),
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)
}
// OpenUploads 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) OpenUploads(tmpDir string) error {
var wg sync.WaitGroup
for _, f := range u.list {
wg.Add(1)
go func(f *FileUpload) {
defer wg.Done()
f.Open(tmpDir)
}(f)
}
wg.Wait()
log.Print(u.list)
return nil
}
// Clear deletes all temporary files.
func (u *Uploads) Clear() {
}
// 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
}
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