[ADF-3666] User Profile - Provide a way to show SSO Logged-In User (#3976)

* * Created IdentityUserService
* Created IdentityUserModel
* Added JWT lib into package.json

* * Provided a way to show SSO user info

* * Added  condition to check sso login

* * Refactored userInfo component* Updated unit tests to the recent changes

* * Created IdenityUser model
* Refactored userInfoComponent

* * Modified userInfoComponent
* Modified unit tests

* * Used Fullname pipe* Removed the logic that we had to display fullname in the ecm/bpm/identity model* Created JwtHelperService* Modified ecm/bpm services * added test cases to the identity service

* * Moved jwt service to core/service

* * Updated userInfo doc

* * Added missing return types

* * Created a mockToken* Added unit tests to the JwtHelperService* Updated identityUserService unit test

* Update jwt-helper.service.spec.ts

* * Updated bpm/ecm/identity services

lib/core/userinfo/services/identity-user.service.ts

@@ -0,0 +1,51 @@
+/*!
+ * @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 { of, Observable } from 'rxjs';
+import { IdentityUserModel } from '../models/identity-user.model';
+import { JwtHelperService } from './../../services/jwt-helper.service';
+
+@Injectable({
+    providedIn: 'root'
+})
+export class IdentityUserService {
+
+    static USER_NAME = 'given_name';
+    static USER_EMAIL = 'email';
+    static USER_ACCESS_TOKEN = 'access_token';
+
+    constructor(private helper: JwtHelperService) {}
+
+    getCurrentUserInfo(): Observable<IdentityUserModel> {
+        const fullName = this.getValueFromToken<string>(IdentityUserService.USER_NAME);
+        const email = this.getValueFromToken<string>(IdentityUserService.USER_EMAIL);
+        const nameParts = fullName.split(' ');
+        const user = { firstName: nameParts[0], lastName: nameParts[1], email: email };
+        return of(new IdentityUserModel(user));
+    }
+
+    getValueFromToken<T>(key: string): T {
+        let value;
+        const token = localStorage.getItem(IdentityUserService.USER_ACCESS_TOKEN);
+        if (token) {
+            const tokenPayload = this.helper.decodeToken(token);
+            value = tokenPayload[key];
+        }
+        return <T> value;
+    }
+}