[ADF-1097] Don't upload file if extension is not acceptable (#2143)

* FileModel's extension getter

* Filter out not supported extension from upload

ng2-components/ng2-alfresco-core/src/models/file.model.spec.ts

@@ -0,0 +1,48 @@
+/*!
+ * @license
+ * Copyright 2016 Alfresco Software, Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { FileModel } from './file.model';
+
+describe('FileModel', () => {
+
+    describe('extension', () => {
+
+        it('should return the extension if file has it', () => {
+            const file = new FileModel(<File> { name: 'tyrion-lannister.doc' });
+
+            expect(file.extension).toBe('doc');
+        });
+
+        it('should return the empty string if file has NOT got it', () => {
+            const file = new FileModel(<File> { name: 'daenerys-targaryen' });
+
+            expect(file.extension).toBe('');
+        });
+
+        it('should return the empty string if file is starting with . and doesn\'t have extension', () => {
+            const file = new FileModel(<File> { name: '.white-walkers' });
+
+            expect(file.extension).toBe('');
+        });
+
+        it('should return the last extension string if file contains many dot', () => {
+            const file = new FileModel(<File> { name: 'you.know.nothing.jon.snow.exe' });
+
+            expect(file.extension).toBe('exe');
+        });
+    });
+});

ng2-components/ng2-alfresco-core/src/models/file.model.ts

@@ -73,4 +73,8 @@ export class FileModel {
             return v.toString(16);
         });
     }
+
+    get extension(): string {
+        return this.name.slice((Math.max(0, this.name.lastIndexOf('.')) || Infinity) + 1);
+    }
 }