[ADF-643] upload enhancements (#1949)

* rework folder uploading

- flatterns hierarchy on folder upload
- performs a single traversal for the entire folder heirarchy and ends with a comple file list
- allows now dropping folders on existing folders
- overall code improvements

* fix unit tests

* readme updates

* clean old and unused code

* code cleanup

* limit concurrent uploads

* update code as per review

* fix upload button for Safari

* fixes for Safari

- Safari compatibility
- code updates based on review

* fix code

* fix unit tests

ng2-components/ng2-alfresco-core/src/utils/file-utils.ts

@@ -0,0 +1,73 @@
+/*!
+ * @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.
+ */
+
+export interface FileInfo {
+    entry?: WebKitFileEntry;
+    file?: File;
+    relativeFolder?: string;
+}
+
+export class FileUtils {
+
+    static flattern(folder: any): Promise<FileInfo[]> {
+        let reader = folder.createReader();
+        let files: FileInfo[] = [];
+        return new Promise(resolve => {
+            let iterations = [];
+            (function traverse() {
+                reader.readEntries((entries) => {
+                    if (!entries.length) {
+                        Promise.all(iterations).then(result => resolve(files));
+                    } else {
+                        iterations.push(Promise.all(entries.map(entry => {
+                            if (entry.isFile) {
+                                return new Promise(resolveFile => {
+                                    entry.file(function (f: File) {
+                                        files.push({
+                                            entry: entry,
+                                            file: f,
+                                            relativeFolder: entry.fullPath.replace(/\/[^\/]*$/, '')
+                                        });
+                                        resolveFile();
+                                    });
+                                });
+                            } else {
+                                return FileUtils.flattern(entry).then(result => {
+                                    files.push(...result);
+                                });
+                            }
+                        })));
+                        // Try calling traverse() again for the same dir, according to spec
+                        traverse();
+                    }
+                });
+            })();
+        });
+    }
+
+    static toFileArray(fileList: FileList): File[] {
+        let result = [];
+
+        if (fileList && fileList.length > 0) {
+            for (let i = 0; i < fileList.length; i++) {
+                result.push(fileList[i]);
+            }
+        }
+
+        return result;
+    }
+}

ng2-components/ng2-alfresco-core/src/utils/index.ts

@@ -16,3 +16,4 @@
  */
 
 export * from './object-utils';
+export * from './file-utils';