added paperless ui

src-ui/src/app/services/auth.service.ts

@@ -0,0 +1,76 @@
+import { Injectable } from '@angular/core';
+import { Observable } from 'rxjs';
+
+import { map } from 'rxjs/operators';
+import { HttpClient } from '@angular/common/http';
+import { Router } from '@angular/router';
+import { environment } from 'src/environments/environment';
+
+interface TokenResponse {
+  token: string
+}
+
+@Injectable({
+  providedIn: 'root'
+})
+export class AuthService {
+
+  private currentUsername: string
+
+  private token: string
+
+  constructor(private http: HttpClient, private router: Router) { 
+    this.token = localStorage.getItem('auth-service:token')
+    if (this.token == null) {
+      this.token = sessionStorage.getItem('auth-service:token')
+    }
+    this.currentUsername = localStorage.getItem('auth-service:currentUsername')
+    if (this.currentUsername == null) {
+      this.currentUsername = sessionStorage.getItem('auth-service:currentUsername')
+    }
+  }
+
+
+  private requestToken(username: string, password: string): Observable<TokenResponse> {
+    return this.http.post<TokenResponse>(`${environment.apiBaseUrl}token/`, {"username": username, "password": password})
+  }
+
+  isAuthenticated(): boolean {
+    return this.currentUsername != null
+  }
+
+  logout() {
+    this.currentUsername = null
+    this.token = null
+    localStorage.removeItem('auth-service:token')
+    localStorage.removeItem('auth-service:currentUsername')
+    sessionStorage.removeItem('auth-service:token')
+    sessionStorage.removeItem('auth-service:currentUsername')
+    this.router.navigate(['login'])
+  }
+
+  login(username: string, password: string, rememberMe: boolean): Observable<boolean> {
+    return this.requestToken(username,password).pipe(
+      map(tokenResponse => {
+        this.currentUsername = username
+        this.token = tokenResponse.token
+        if (rememberMe) {
+          localStorage.setItem('auth-service:token', this.token)
+          localStorage.setItem('auth-service:currentUsername', this.currentUsername)
+        } else {
+          sessionStorage.setItem('auth-service:token', this.token)
+          sessionStorage.setItem('auth-service:currentUsername', this.currentUsername)
+        }
+        return true
+      })
+    )
+  }
+
+  getToken(): string {
+    return this.token
+  }
+
+  getCurrentUsername(): string {
+    return this.currentUsername
+  }
+}