Generate thumbnail client side and send its URL and info with the image message body

webclient/components/fileUpload/file-upload-service.js

@@ -20,17 +20,18 @@
 /*
  * Upload an HTML5 file to a server
  */
-angular.module('mFileUpload', [])
-.service('mFileUpload', ['matrixService', '$q', function (matrixService, $q) {
+angular.module('mFileUpload', ['matrixService', 'mUtilities'])
+.service('mFileUpload', ['$q', 'matrixService', 'mUtilities', function ($q, matrixService, mUtilities) {
         
     /*
-     * Upload an HTML5 file to a server and returned a promise
+     * Upload an HTML5 file or blob to a server and returned a promise
      * that will provide the URL of the uploaded file.
+     * @param {File|Blob} file the file data to send
      */
-    this.uploadFile = function(file, body) {
+    this.uploadFile = function(file) {
         var deferred = $q.defer();
         console.log("Uploading " + file.name + "... to /matrix/content");
-        matrixService.uploadContent(file, body).then(
+        matrixService.uploadContent(file).then(
             function(response) {
                 var content_url = location.origin + "/matrix/content/" + response.data.content_token;
                 console.log("   -> Successfully uploaded! Available at " + content_url);
@@ -44,4 +45,134 @@ angular.module('mFileUpload', [])
         
         return deferred.promise;
     };
+    
+    /*
+     * Upload an image file plus generate a thumbnail of it and upload it so that
+     * we will have all information to fulfill an image message request data.
+     * @param {File} imageFile the imageFile to send
+     * @param {Integer} thumbnailSize the max side size of the thumbnail to create
+     * @returns {promise} A promise that will be resolved by a image message object
+     *   ready to be send with the Matrix API
+     */
+    this.uploadImageAndThumbnail = function(imageFile, thumbnailSize) {
+        var self = this;
+        var deferred = $q.defer();
+
+        console.log("uploadImageAndThumbnail " + imageFile.name + " - thumbnailSize: " + thumbnailSize);
+
+        // The message structure that will be returned in the promise
+        var imageMessage = {
+            msgtype: "m.image",
+            url: undefined,
+            body: {
+                size: undefined,
+                w: undefined,
+                h: undefined,
+                mimetype: undefined
+            },
+            thumbnail_url: undefined,
+            thumbnail_info: {
+                size: undefined,
+                w: undefined,
+                h: undefined,
+                mimetype: undefined
+            }
+        };
+
+        // First, get the image size
+        mUtilities.getImageSize(imageFile).then(
+            function(size) {
+
+                // The final operation: send imageFile
+                var uploadImage = function() {
+                    self.uploadFile(imageFile).then(
+                        function(url) {
+                            // Update message metadata
+                            imageMessage.url = url;
+                            imageMessage.body = {
+                                size: imageFile.size,
+                                w: size.width,
+                                h: size.height,
+                                mimetype: imageFile.type
+                            };
+
+                            // If there is no thumbnail (because the original image is smaller than thumbnailSize),
+                            // reuse the original image info for thumbnail data
+                            if (!imageMessage.thumbnail_url) {
+                                imageMessage.thumbnail_url = imageMessage.url;
+                                imageMessage.thumbnail_info = imageMessage.body;
+                            }
+
+                            // We are done
+                            deferred.resolve(imageMessage);
+                        },
+                        function(error) {
+                            console.log("      -> Can't upload image");
+                            deferred.reject(error); 
+                        }
+                    );
+                };
+
+                // Create a thumbnail if the image size exceeds thumbnailSize
+                if (Math.max(size.width, size.height) > thumbnailSize) {
+                    console.log("    Creating thumbnail...");
+                    mUtilities.resizeImage(imageFile, thumbnailSize).then(
+                        function(thumbnailBlob) {
+
+                            // Get its size
+                            mUtilities.getImageSize(thumbnailBlob).then(
+                                function(thumbnailSize) {
+                                    console.log("      -> Thumbnail size: " + JSON.stringify(thumbnailSize));
+
+                                    // Upload it to the server
+                                    self.uploadFile(thumbnailBlob).then(
+                                        function(thumbnailUrl) {
+
+                                            // Update image message data
+                                            imageMessage.thumbnail_url = thumbnailUrl;
+                                            imageMessage.thumbnail_info = {
+                                                size: thumbnailBlob.size,
+                                                w: thumbnailSize.width,
+                                                h: thumbnailSize.height,
+                                                mimetype: thumbnailBlob.type
+                                            };
+
+                                            // Then, upload the original image
+                                            uploadImage();
+                                        },
+                                        function(error) {
+                                            console.log("      -> Can't upload thumbnail");
+                                            deferred.reject(error); 
+                                        }
+                                    );
+                                },
+                                function(error) {
+                                    console.log("      -> Failed to get thumbnail size");
+                                    deferred.reject(error); 
+                                }
+                            );
+
+                        },
+                        function(error) {
+                            console.log("      -> Failed to create thumbnail: " + error);
+                            deferred.reject(error); 
+                        }
+                    );
+                }
+                else {
+                    // No need of thumbnail
+                    console.log("   Thumbnail is not required");
+                    uploadImage();
+                }
+
+            },
+            function(error) {
+                console.log("   -> Failed to get image size");
+                deferred.reject(error); 
+            }
+        );
+
+        return deferred.promise;
+    };
+
 }]);

webclient/components/utilities/utilities-service.js

@@ -23,7 +23,7 @@ angular.module('mUtilities', [])
 .service('mUtilities', ['$q', function ($q) {
     /*
      * Get the size of an image
-     * @param {File} imageFile the file containing the image
+     * @param {File|Blob} imageFile the file containing the image
      * @returns {promise} A promise that will be resolved by an object with 2 members:
      *   width & height
      */

webclient/room/room-controller.js

@@ -19,6 +19,7 @@ angular.module('RoomController', ['ngSanitize', 'mUtilities'])
                                function($scope, $http, $timeout, $routeParams, $location, matrixService, eventStreamService, eventHandlerService, mFileUpload, mUtilities) {
    'use strict';
     var MESSAGES_PER_PAGINATION = 30;
+    var THUMBNAIL_SIZE = 320;
 
     // Room ids. Computed and resolved in onInit
     $scope.room_id = undefined;
@@ -386,33 +387,22 @@ angular.module('RoomController', ['ngSanitize', 'mUtilities'])
 
             $scope.state.sending = true;
 
-            // First, get the image sise
-            mUtilities.getImageSize($scope.imageFileToSend).then(
-                function(size) {
-
-                    // Upload the image to the Internet
-                    console.log("Uploading image...");
-                    mFileUpload.uploadFile($scope.imageFileToSend).then(
-                        function(url) {
-                            // Build the image info data
-                            var imageInfo = {
-                                size: $scope.imageFileToSend.size,
-                                mimetype: $scope.imageFileToSend.type,
-                                w: size.width,
-                                h: size.height
-                            };
-
-                            // Then share the URL and the metadata
-                            $scope.sendImage(url, imageInfo);
+            // Upload this image with its thumbnail to Internet
+            mFileUpload.uploadImageAndThumbnail($scope.imageFileToSend, THUMBNAIL_SIZE).then(
+                function(imageMessage) {
+                    // imageMessage is complete message structure, send it as is
+                    matrixService.sendMessage($scope.room_id, undefined, imageMessage).then(
+                        function() {
+                            console.log("Image message sent");
+                            $scope.state.sending = false;
                         },
                         function(error) {
-                            $scope.feedback = "Can't upload image";
+                            $scope.feedback = "Failed to send image message: " + error.data.error;
                             $scope.state.sending = false;
-                        }
-                    );
+                        });
                 },
                 function(error) {
-                    $scope.feedback = "Can't get selected image size";
+                    $scope.feedback = "Can't upload image";
                     $scope.state.sending = false;
                 }
             );