1 files changed, 96 insertions, 0 deletions
diff --git a/Timeline/ClientApp/src/app/user/internal-user-service/internal-user.service.ts b/Timeline/ClientApp/src/app/user/internal-user-service/internal-user.service.ts
new file mode 100644
index 00000000..91a67e5b
--- /dev/null
+++ b/Timeline/ClientApp/src/app/user/internal-user-service/internal-user.service.ts
@@ -0,0 +1,96 @@
+import { Injectable } from '@angular/core';
+import { HttpClient, HttpErrorResponse } from '@angular/common/http';
+import { Router } from '@angular/router';
+
+import { Observable, of, throwError, BehaviorSubject } from 'rxjs';
+import { map, catchError, retry } from 'rxjs/operators';
+
+import { AlreadyLoginError, BadCredentialsError, BadNetworkError, UnknownError } from './errors';
+import {
+  createTokenUrl, validateTokenUrl, CreateTokenRequest,
+  CreateTokenResponse, ValidateTokenRequest, ValidateTokenResponse
+} from './http-entities';
+import { UserCredentials, UserInfo } from '../entities';
+
+
+export type UserLoginState = 'nologin' | 'invalidlogin' | 'success';
+
+/**
+ * This service is only used internal in user module.
+ */
+@Injectable({
+  providedIn: 'root'
+})
+export class InternalUserService {
+
+  private token: string;
+  private userInfoSubject = new BehaviorSubject<UserInfo | null>(null);
+
+  get currentUserInfo(): UserInfo | null {
+    return this.userInfoSubject.value;
+  }
+
+  get userInfo$(): Observable<UserInfo | null> {
+    return this.userInfoSubject;
+  }
+
+  constructor(private httpClient: HttpClient, private router: Router) { }
+
+  userRouteNavigate(commands: any[]) {
+    this.router.navigate([{
+      outlets: {
+        user: commands
+      }
+    }]);
+  }
+
+  refreshAndGetUserState(): Observable<UserLoginState> {
+    if (this.token === undefined || this.token === null) {
+      return of(<UserLoginState>'nologin');
+    }
+
+    return this.httpClient.post<ValidateTokenResponse>(validateTokenUrl, <ValidateTokenRequest>{ token: this.token }).pipe(
+      retry(3),
+      catchError(error => {
+        console.error('Failed to validate token.');
+        return throwError(error);
+      }),
+      map(result => {
+        if (result.isValid) {
+          this.userInfoSubject.next(result.userInfo);
+          return <UserLoginState>'success';
+        } else {
+          this.token = null;
+          this.userInfoSubject.next(null);
+          return <UserLoginState>'invalidlogin';
+        }
+      })
+    );
+  }
+
+  tryLogin(credentials: UserCredentials): Observable<UserInfo> {
+    if (this.token) {
+      return throwError(new AlreadyLoginError());
+    }
+
+    return this.httpClient.post<CreateTokenResponse>(createTokenUrl, <CreateTokenRequest>credentials).pipe(
+      catchError((error: HttpErrorResponse) => {
+        if (error.error instanceof ErrorEvent) {
+          console.error('An error occurred when login: ' + error.error.message);
+          return throwError(new BadNetworkError());
+        } else if (error.status === 400) {
+          console.error('An error occurred when login: wrong credentials.');
+          return throwError(new BadCredentialsError());
+        } else {
+          console.error('An unknown error occurred when login: ' + error);
+          return throwError(new UnknownError(error));
+        }
+      }),
+      map(result => {
+        this.token = result.token;
+        this.userInfoSubject.next(result.userInfo);
+        return result.userInfo;
+      })
+    );
+  }
+}