Fixed IDb images load

Closes #597
Closes #845

app/js/lib/mtproto_wrapper.js

@@ -375,6 +375,8 @@ angular.module('izhukov.mtproto.wrapper', ['izhukov.utils', 'izhukov.mtproto'])
     if (!cachedSavePromises[fileName]) {
       cachedSavePromises[fileName] = getFileStorage().saveFile(fileName, bytes).then(function (blob) {
         return cachedDownloads[fileName] = blob;
+      }, function (error) {
+        delete cachedSavePromises[fileName];
       });
     }
     return cachedSavePromises[fileName];
@@ -384,7 +386,6 @@ angular.module('izhukov.mtproto.wrapper', ['izhukov.utils', 'izhukov.mtproto'])
     if (!FileManager.isAvailable()) {
       return $q.reject({type: 'BROWSER_BLOB_NOT_SUPPORTED'});
     }
-    // console.log('dload small', location);
     var fileName = getFileName(location),
         mimeType = location.sticker ? 'image/webp' : 'image/jpeg',
         cachedPromise = cachedSavePromises[fileName] || cachedDownloadPromises[fileName];

app/js/lib/ng_utils.js

@@ -449,9 +449,16 @@ angular.module('izhukov.utils', [])
     if (getBlobSize(blob) > 10 * 1024 * 1024) {
       return $q.reject();
     }
+    if (!(blob instanceof Blob)) {
+      var mimeType = blob.type || 'image/jpeg';
+      var address = 'data:' + mimeType + ';base64,' + bytesToBase64(blob);
+      return storagePutB64String(db, fileName, address).then(function () {
+        return blob;
+      });
+    }
+
     try {
       var reader = new FileReader();
-      reader.readAsDataURL(blob);
     } catch (e) {
       storageIsAvailable = false;
       return $q.reject();
@@ -460,26 +467,49 @@ angular.module('izhukov.utils', [])
     var deferred = $q.defer();
 
     reader.onloadend = function() {
-      try {
-        var objectStore = db.transaction([dbStoreName], IDBTransaction.READ_WRITE || 'readwrite').objectStore(dbStoreName),
-            request = objectStore.put(reader.result, fileName);
-      } catch (error) {
-        storageIsAvailable = false;
-        deferred.reject(error);
-        return;
-      };
-      request.onsuccess = function (event) {
+      storagePutB64String(db, fileName, reader.result).then(function () {
         deferred.resolve(blob);
-      };
-
-      request.onerror = function (error) {
+      }, function (error) {
         deferred.reject(error);
-      };
+      });
+    }
+
+    reader.onerror = function (error) {
+      deferred.reject(error);
+    }
+
+    try {
+      reader.readAsDataURL(blob);
+    } catch (e) {
+      storageIsAvailable = false;
+      return $q.reject();
     }
 
     return deferred.promise;
   }
 
+  function storagePutB64String (db, fileName, b64string) {
+    try {
+      var objectStore = db.transaction([dbStoreName], IDBTransaction.READ_WRITE || 'readwrite').objectStore(dbStoreName),
+          request = objectStore.put(b64string, fileName);
+    } catch (error) {
+      storageIsAvailable = false;
+      return $q.reject(error);
+    };
+
+    var deferred = $q.defer();
+
+    request.onsuccess = function (event) {
+      deferred.resolve();
+    };
+
+    request.onerror = function (error) {
+      deferred.reject(error);
+    };
+
+    return deferred.promise;
+  }
+
   function getBlobSize (blob) {
     return blob.size || blob.byteLength || blob.length;
   }