add blueimp-jquery-file-upload library

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)
+}