[ADF-4911] migrate identity role service (#5096)

* migrate IdentityRoleService implementation

* update unit tests

* move interfaces to the origin

* move models to proper places

* migrate model to interface

* fix test

* update docs

lib/core/services/ecm-user.service.ts

@@ -0,0 +1,81 @@
+/*!
+ * @license
+ * Copyright 2019 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 { Observable, from, throwError } from 'rxjs';
+import { map, catchError } from 'rxjs/operators';
+import { ContentService } from './content.service';
+import { AlfrescoApiService } from './alfresco-api.service';
+import { LogService } from './log.service';
+import { EcmUserModel } from '../models/ecm-user.model';
+import { PersonEntry } from '@alfresco/js-api';
+
+@Injectable({
+    providedIn: 'root'
+})
+export class EcmUserService {
+
+    constructor(private apiService: AlfrescoApiService,
+                private contentService: ContentService,
+                private logService: LogService) {
+    }
+
+    /**
+     * Gets information about a user identified by their username.
+     * @param userName Target username
+     * @returns User information
+     */
+    getUserInfo(userName: string): Observable<EcmUserModel> {
+        return from(this.apiService.getInstance().core.peopleApi.getPerson(userName))
+            .pipe(
+                map((personEntry: PersonEntry) => {
+                    return new EcmUserModel(personEntry.entry);
+                }),
+                catchError((err) => this.handleError(err))
+            );
+    }
+
+    /**
+     * Gets information about the user who is currently logged-in.
+     * @returns User information as for getUserInfo
+     */
+    getCurrentUserInfo() {
+        return this.getUserInfo('-me-');
+    }
+
+    /**
+     * Returns a profile image as a URL.
+     * @param avatarId Target avatar
+     * @returns Image URL
+     */
+    getUserProfileImage(avatarId: string): string {
+        if (avatarId) {
+            return this.contentService.getContentUrl(avatarId);
+        }
+        return null;
+    }
+
+    /**
+     * Throw the error
+     * @param error
+     */
+    private handleError(error: any) {
+        this.logService.error(error);
+        return throwError(error || 'Server error');
+    }
+
+}