Form: support for embedded document view (#1748)

* Form: support for embedded document view

* unit tests and improvements

- new ContentService to deal with trusted URL and downloads
- unit tests and improvements for ActivitiContent component

ng2-components/ng2-alfresco-core/src/services/content.service.ts

@@ -0,0 +1,109 @@
+/*!
+ * @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 { Injectable } from '@angular/core';
+import { DomSanitizer } from '@angular/platform-browser';
+
+@Injectable()
+export class ContentService {
+
+    private saveData: Function;
+
+    constructor(private sanitizer: DomSanitizer ) {
+        this.saveData = (function () {
+            let a = document.createElement('a');
+            document.body.appendChild(a);
+            a.style.display = 'none';
+
+            return function (data, format, fileName) {
+                let blob = null;
+
+                if (format === 'blob') {
+                    blob = data;
+                }
+
+                if (format === 'data') {
+                    blob = new Blob([data], {type: 'octet/stream'});
+                }
+
+                if (format === 'object' || format === 'json') {
+                    let json = JSON.stringify(data);
+                    blob = new Blob([json], {type: 'octet/stream'});
+                }
+
+                if (blob) {
+                    let url = window.URL.createObjectURL(blob);
+                    a.href = url;
+                    a.download = fileName;
+                    a.click();
+
+                    window.URL.revokeObjectURL(url);
+                }
+            };
+        }());
+    }
+
+    /**
+     * Invokes content download for a Blob with a file name.
+     *
+     * @param {Blob} blob Content to download.
+     * @param {string} fileName Name of the resulting file.
+     *
+     * @memberOf ContentService
+     */
+    downloadBlob(blob: Blob, fileName: string): void {
+        this.saveData(blob, 'blob', fileName);
+    }
+
+    /**
+     * Invokes content download for a data array with a file name.
+     *
+     * @param {*} data Data to download.
+     * @param {string} fileName Name of the resulting file.
+     *
+     * @memberOf ContentService
+     */
+    downloadData(data: any, fileName: string): void {
+        this.saveData(data, 'data', fileName);
+    }
+
+    /**
+     * Invokes content download for a JSON object with a file name.
+     *
+     * @param {*} json JSON object to download.
+     * @param {any} fileName Name of the resulting file.
+     *
+     * @memberOf ContentService
+     */
+    downloadJSON(json: any, fileName): void {
+        this.saveData(json, 'json', fileName);
+    }
+
+    /**
+     * Creates a trusted object URL from the Blob.
+     * WARNING: calling this method with untrusted user data exposes your application to XSS security risks!
+     * @param {Blob} blob Data to wrap into object URL
+     * @returns {string} Object URL content.
+     *
+     * @memberOf ContentService
+     */
+    createTrustedUrl(blob: Blob): string {
+        let url = window.URL.createObjectURL(blob);
+        return <string> this.sanitizer.bypassSecurityTrustUrl(url);
+    }
+
+}