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authorfriendica <info@friendica.com>2014-10-05 01:18:50 -0700
committerfriendica <info@friendica.com>2014-10-05 01:18:50 -0700
commit82ba42586cc9427b8a118c30462fc66d92cffecd (patch)
tree6b8866b0f357a4e7cff3b6c80f42c56ad44376c9 /library/blueimp_upload/server/gae-go/app/main.go
parent191ef124cf6f6ec3978eededba13bd13463140a1 (diff)
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add blueimp-jquery-file-upload library
Diffstat (limited to 'library/blueimp_upload/server/gae-go/app/main.go')
-rw-r--r--library/blueimp_upload/server/gae-go/app/main.go296
1 files changed, 296 insertions, 0 deletions
diff --git a/library/blueimp_upload/server/gae-go/app/main.go b/library/blueimp_upload/server/gae-go/app/main.go
new file mode 100644
index 000000000..03af0b1d2
--- /dev/null
+++ b/library/blueimp_upload/server/gae-go/app/main.go
@@ -0,0 +1,296 @@
+/*
+ * jQuery File Upload Plugin GAE Go Example 3.2.0
+ * https://github.com/blueimp/jQuery-File-Upload
+ *
+ * Copyright 2011, Sebastian Tschan
+ * https://blueimp.net
+ *
+ * Licensed under the MIT license:
+ * http://www.opensource.org/licenses/MIT
+ */
+
+package app
+
+import (
+ "appengine"
+ "appengine/blobstore"
+ "appengine/image"
+ "appengine/taskqueue"
+ "bytes"
+ "encoding/json"
+ "fmt"
+ "io"
+ "log"
+ "mime/multipart"
+ "net/http"
+ "net/url"
+ "regexp"
+ "strings"
+ "time"
+)
+
+const (
+ WEBSITE = "https://blueimp.github.io/jQuery-File-Upload/"
+ MIN_FILE_SIZE = 1 // bytes
+ MAX_FILE_SIZE = 5000000 // bytes
+ IMAGE_TYPES = "image/(gif|p?jpeg|(x-)?png)"
+ ACCEPT_FILE_TYPES = IMAGE_TYPES
+ EXPIRATION_TIME = 300 // seconds
+ THUMBNAIL_PARAM = "=s80"
+)
+
+var (
+ imageTypes = regexp.MustCompile(IMAGE_TYPES)
+ acceptFileTypes = regexp.MustCompile(ACCEPT_FILE_TYPES)
+)
+
+type FileInfo struct {
+ Key appengine.BlobKey `json:"-"`
+ Url string `json:"url,omitempty"`
+ ThumbnailUrl string `json:"thumbnailUrl,omitempty"`
+ Name string `json:"name"`
+ Type string `json:"type"`
+ Size int64 `json:"size"`
+ Error string `json:"error,omitempty"`
+ DeleteUrl string `json:"deleteUrl,omitempty"`
+ DeleteType string `json:"deleteType,omitempty"`
+}
+
+func (fi *FileInfo) ValidateType() (valid bool) {
+ if acceptFileTypes.MatchString(fi.Type) {
+ return true
+ }
+ fi.Error = "Filetype not allowed"
+ return false
+}
+
+func (fi *FileInfo) ValidateSize() (valid bool) {
+ if fi.Size < MIN_FILE_SIZE {
+ fi.Error = "File is too small"
+ } else if fi.Size > MAX_FILE_SIZE {
+ fi.Error = "File is too big"
+ } else {
+ return true
+ }
+ return false
+}
+
+func (fi *FileInfo) CreateUrls(r *http.Request, c appengine.Context) {
+ u := &url.URL{
+ Scheme: r.URL.Scheme,
+ Host: appengine.DefaultVersionHostname(c),
+ Path: "/",
+ }
+ uString := u.String()
+ fi.Url = uString + escape(string(fi.Key)) + "/" +
+ escape(string(fi.Name))
+ fi.DeleteUrl = fi.Url + "?delete=true"
+ fi.DeleteType = "DELETE"
+ if imageTypes.MatchString(fi.Type) {
+ servingUrl, err := image.ServingURL(
+ c,
+ fi.Key,
+ &image.ServingURLOptions{
+ Secure: strings.HasSuffix(u.Scheme, "s"),
+ Size: 0,
+ Crop: false,
+ },
+ )
+ check(err)
+ fi.ThumbnailUrl = servingUrl.String() + THUMBNAIL_PARAM
+ }
+}
+
+func check(err error) {
+ if err != nil {
+ panic(err)
+ }
+}
+
+func escape(s string) string {
+ return strings.Replace(url.QueryEscape(s), "+", "%20", -1)
+}
+
+func delayedDelete(c appengine.Context, fi *FileInfo) {
+ if key := string(fi.Key); key != "" {
+ task := &taskqueue.Task{
+ Path: "/" + escape(key) + "/-",
+ Method: "DELETE",
+ Delay: time.Duration(EXPIRATION_TIME) * time.Second,
+ }
+ taskqueue.Add(c, task, "")
+ }
+}
+
+func handleUpload(r *http.Request, p *multipart.Part) (fi *FileInfo) {
+ fi = &FileInfo{
+ Name: p.FileName(),
+ Type: p.Header.Get("Content-Type"),
+ }
+ if !fi.ValidateType() {
+ return
+ }
+ defer func() {
+ if rec := recover(); rec != nil {
+ log.Println(rec)
+ fi.Error = rec.(error).Error()
+ }
+ }()
+ lr := &io.LimitedReader{R: p, N: MAX_FILE_SIZE + 1}
+ context := appengine.NewContext(r)
+ w, err := blobstore.Create(context, fi.Type)
+ defer func() {
+ w.Close()
+ fi.Size = MAX_FILE_SIZE + 1 - lr.N
+ fi.Key, err = w.Key()
+ check(err)
+ if !fi.ValidateSize() {
+ err := blobstore.Delete(context, fi.Key)
+ check(err)
+ return
+ }
+ delayedDelete(context, fi)
+ fi.CreateUrls(r, context)
+ }()
+ check(err)
+ _, err = io.Copy(w, lr)
+ return
+}
+
+func getFormValue(p *multipart.Part) string {
+ var b bytes.Buffer
+ io.CopyN(&b, p, int64(1<<20)) // Copy max: 1 MiB
+ return b.String()
+}
+
+func handleUploads(r *http.Request) (fileInfos []*FileInfo) {
+ fileInfos = make([]*FileInfo, 0)
+ mr, err := r.MultipartReader()
+ check(err)
+ r.Form, err = url.ParseQuery(r.URL.RawQuery)
+ check(err)
+ part, err := mr.NextPart()
+ for err == nil {
+ if name := part.FormName(); name != "" {
+ if part.FileName() != "" {
+ fileInfos = append(fileInfos, handleUpload(r, part))
+ } else {
+ r.Form[name] = append(r.Form[name], getFormValue(part))
+ }
+ }
+ part, err = mr.NextPart()
+ }
+ return
+}
+
+func get(w http.ResponseWriter, r *http.Request) {
+ if r.URL.Path == "/" {
+ http.Redirect(w, r, WEBSITE, http.StatusFound)
+ return
+ }
+ parts := strings.Split(r.URL.Path, "/")
+ if len(parts) == 3 {
+ if key := parts[1]; key != "" {
+ blobKey := appengine.BlobKey(key)
+ bi, err := blobstore.Stat(appengine.NewContext(r), blobKey)
+ if err == nil {
+ w.Header().Add("X-Content-Type-Options", "nosniff")
+ if !imageTypes.MatchString(bi.ContentType) {
+ w.Header().Add("Content-Type", "application/octet-stream")
+ w.Header().Add(
+ "Content-Disposition",
+ fmt.Sprintf("attachment; filename=\"%s\"", parts[2]),
+ )
+ }
+ w.Header().Add(
+ "Cache-Control",
+ fmt.Sprintf("public,max-age=%d", EXPIRATION_TIME),
+ )
+ blobstore.Send(w, blobKey)
+ return
+ }
+ }
+ }
+ http.Error(w, "404 Not Found", http.StatusNotFound)
+}
+
+func post(w http.ResponseWriter, r *http.Request) {
+ result := make(map[string][]*FileInfo, 1)
+ result["files"] = handleUploads(r)
+ b, err := json.Marshal(result)
+ check(err)
+ if redirect := r.FormValue("redirect"); redirect != "" {
+ if strings.Contains(redirect, "%s") {
+ redirect = fmt.Sprintf(
+ redirect,
+ escape(string(b)),
+ )
+ }
+ http.Redirect(w, r, redirect, http.StatusFound)
+ return
+ }
+ w.Header().Set("Cache-Control", "no-cache")
+ jsonType := "application/json"
+ if strings.Index(r.Header.Get("Accept"), jsonType) != -1 {
+ w.Header().Set("Content-Type", jsonType)
+ }
+ fmt.Fprintln(w, string(b))
+}
+
+func delete(w http.ResponseWriter, r *http.Request) {
+ parts := strings.Split(r.URL.Path, "/")
+ if len(parts) != 3 {
+ return
+ }
+ result := make(map[string]bool, 1)
+ if key := parts[1]; key != "" {
+ c := appengine.NewContext(r)
+ blobKey := appengine.BlobKey(key)
+ err := blobstore.Delete(c, blobKey)
+ check(err)
+ err = image.DeleteServingURL(c, blobKey)
+ check(err)
+ result[key] = true
+ }
+ jsonType := "application/json"
+ if strings.Index(r.Header.Get("Accept"), jsonType) != -1 {
+ w.Header().Set("Content-Type", jsonType)
+ }
+ b, err := json.Marshal(result)
+ check(err)
+ fmt.Fprintln(w, string(b))
+}
+
+func handle(w http.ResponseWriter, r *http.Request) {
+ params, err := url.ParseQuery(r.URL.RawQuery)
+ check(err)
+ w.Header().Add("Access-Control-Allow-Origin", "*")
+ w.Header().Add(
+ "Access-Control-Allow-Methods",
+ "OPTIONS, HEAD, GET, POST, PUT, DELETE",
+ )
+ w.Header().Add(
+ "Access-Control-Allow-Headers",
+ "Content-Type, Content-Range, Content-Disposition",
+ )
+ switch r.Method {
+ case "OPTIONS":
+ case "HEAD":
+ case "GET":
+ get(w, r)
+ case "POST":
+ if len(params["_method"]) > 0 && params["_method"][0] == "DELETE" {
+ delete(w, r)
+ } else {
+ post(w, r)
+ }
+ case "DELETE":
+ delete(w, r)
+ default:
+ http.Error(w, "501 Not Implemented", http.StatusNotImplemented)
+ }
+}
+
+func init() {
+ http.HandleFunc("/", handle)
+}