add login service

src/app/@core/data/user-response.ts

@@ -0,0 +1,9 @@
+export interface UserResponse {
+    username: string,
+    value: UserRole[],
+}
+
+export interface UserRole {
+    resourcealias: string,
+    relationshiptypealias: string,
+}

src/app/@core/data/user.ts

@@ -0,0 +1,4 @@
+export interface User {
+    username: string,
+    password: string,
+}

src/app/auth/login.service.ts

@@ -0,0 +1,50 @@
+import { Injectable } from '@angular/core';
+import { HttpClient, HttpErrorResponse } from '@angular/common/http';
+import { Observable, throwError } from 'rxjs';
+import { map, catchError, tap } from 'rxjs/operators';
+import { UserResponse } from '../@core/data/user-response';
+import { User } from '../@core/data/user';
+
+@Injectable({
+    providedIn: 'root',
+})
+export class LoginService {
+    constructor(private http: HttpClient) {
+    }
+
+    login(user: User): Observable<any> {
+        const url = 'http://10.170.3.190:8011/api/user/getAuthorization ';
+        return this.http.post(url,JSON.stringify(user)).pipe(
+            map(this.extractData),
+            catchError(this.handleError),
+            tap(res => this.setSession(res)),
+        );
+    }
+
+    public setSession(authResult) {
+        localStorage.setItem('roles', authResult.value);
+        localStorage.setItem('username', authResult.username);
+    }     
+
+
+    private extractData(body: any): UserResponse {
+        return Object.assign(body.promotionList);
+    }
+
+    private handleError(error: HttpErrorResponse | any) {
+        let errMsg: string;
+        let errObj: any;
+
+        if (error instanceof HttpErrorResponse) {
+            const err = error.message || JSON.stringify(error);
+            errMsg = `${error.status} - ${error.statusText || ''} ${err}`;
+            errObj = error.error.message;
+        } else {
+            errMsg = error.message ? error.message : error.toString();
+            const body = error.message || '';
+            errObj = body;
+        }
+
+        return throwError(errObj);
+    }
+}