[SFSNG-724] content services (#2089)

* content services

* rebase index file

ng2-components/ng2-alfresco-core/src/services/sites-api.service.ts

@@ -0,0 +1,62 @@
+/*!
+ * @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 { MinimalNodeEntryEntity, NodePaging } from 'alfresco-js-api';
+import { Observable } from 'rxjs/Rx';
+import { AlfrescoApiService } from './alfresco-api.service';
+import { NodesApiService } from './nodes-api.service';
+import { UserPreferencesService } from './user-preferences.service';
+
+@Injectable()
+export class SitesApiService {
+
+    constructor(
+        private apiService: AlfrescoApiService,
+        private nodesApi: NodesApiService,
+        private preferences: UserPreferencesService) {}
+
+    private get sitesApi() {
+       return this.apiService.getInstance().core.sitesApi;
+    }
+
+    getSites(options: any = {}): Observable<NodePaging> {
+        const { sitesApi, handleError } = this;
+        const defaultOptions = {
+            maxItems: this.preferences.paginationSize,
+            skipCount: 0,
+            include: [ 'properties' ]
+        };
+        const queryOptions = Object.assign({}, defaultOptions, options);
+        const promise = sitesApi.getSites(queryOptions);
+
+        return Observable
+            .fromPromise(promise)
+            .catch(handleError);
+    }
+
+    getSiteDocumentLibrary(siteId: string): Observable<MinimalNodeEntryEntity> {
+        const { nodesApi } = this;
+
+        return nodesApi
+            .getNode(siteId, { relativePath: '/documentLibrary' });
+    }
+
+    private handleError(error: any): Observable<any> {
+        return Observable.of(error);
+    }
+}