Initial Commit - NG UI

[osm/NG-UI.git] / src / services / AuthGuardService.ts

diff --git a/src/services/AuthGuardService.ts b/src/services/AuthGuardService.ts
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+/*
+ Copyright 2020 TATA ELXSI
+
+ 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.
+
+ Author: KUMARAN M (kumaran.m@tataelxsi.co.in), RAJESH S (rajesh.s@tataelxsi.co.in), BARATH KUMAR R (barath.r@tataelxsi.co.in)
+ */
+
+/**
+ * @file Auth gaurd
+ */
+import { Injectable } from '@angular/core';
+import { ActivatedRouteSnapshot, CanActivate, Router, RouterStateSnapshot } from '@angular/router';
+import { AuthenticationService } from 'AuthenticationService';
+import { Observable } from 'rxjs';
+import { map, take } from 'rxjs/operators';
+
+/**
+ * An Injectable is a class adorned with the @Injectable decorator function.
+ * @Injectable takes a metadata object that tells Angular how to compile and run module code
+ */
+@Injectable()
+export class AuthGuardService implements CanActivate {
+    /** Holds teh instance of AuthService class of type AuthService @private */
+    private router: Router;
+    /** Holds teh instance of Router class of type Router @private */
+    private authService: AuthenticationService;
+
+    constructor(router: Router, authService: AuthenticationService) {
+        this.router = router;
+        this.authService = authService;
+    }
+
+    /**
+     * Returns Observable<boolean> if authorized @public
+     */
+    public canActivate(next: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<boolean> {
+        return this.authService.isLoggedIn
+            .pipe(
+                take(1),
+                map((isLoggedIn: boolean) => {
+                    if (!isLoggedIn) {
+                        this.router.navigate(['/login']).catch(() => {
+                            //TODO: Handle error notification
+                        });
+                    }
+                    return true;
+                })
+            );
+    }
+}