6 files changed, 179 insertions, 0 deletions
diff --git a/Timeline/ClientApp/src/app/user-dialog/user-dialog.component.css b/Timeline/ClientApp/src/app/user-dialog/user-dialog.component.css
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/Timeline/ClientApp/src/app/user-dialog/user-dialog.component.css
diff --git a/Timeline/ClientApp/src/app/user-dialog/user-dialog.component.html b/Timeline/ClientApp/src/app/user-dialog/user-dialog.component.html
new file mode 100644
index 00000000..2c5d1879
--- /dev/null
+++ b/Timeline/ClientApp/src/app/user-dialog/user-dialog.component.html
@@ -0,0 +1,3 @@
+<div [ngSwitch]="state">
+  <app-user-login *ngSwitchCase="'login'"></app-user-login>
+</div>
diff --git a/Timeline/ClientApp/src/app/user-dialog/user-dialog.component.spec.ts b/Timeline/ClientApp/src/app/user-dialog/user-dialog.component.spec.ts
new file mode 100644
index 00000000..884a3710
--- /dev/null
+++ b/Timeline/ClientApp/src/app/user-dialog/user-dialog.component.spec.ts
@@ -0,0 +1,25 @@
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { UserDialogComponent } from './user-dialog.component';
+
+xdescribe('UserDialogComponent', () => {
+  let component: UserDialogComponent;
+  let fixture: ComponentFixture<UserDialogComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ UserDialogComponent ]
+    })
+    .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(UserDialogComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});
diff --git a/Timeline/ClientApp/src/app/user-dialog/user-dialog.component.ts b/Timeline/ClientApp/src/app/user-dialog/user-dialog.component.ts
new file mode 100644
index 00000000..1d9536c8
--- /dev/null
+++ b/Timeline/ClientApp/src/app/user-dialog/user-dialog.component.ts
@@ -0,0 +1,20 @@
+import { Component, OnInit } from '@angular/core';
+
+@Component({
+  selector: 'app-user-dialog',
+  templateUrl: './user-dialog.component.html',
+  styleUrls: ['./user-dialog.component.css']
+})
+export class UserDialogComponent implements OnInit {
+
+  constructor() { }
+
+  state: 'login' | 'success' = 'login';
+
+  ngOnInit() {
+  }
+
+  login() {
+
+  }
+}
diff --git a/Timeline/ClientApp/src/app/user-dialog/user.service.spec.ts b/Timeline/ClientApp/src/app/user-dialog/user.service.spec.ts
new file mode 100644
index 00000000..b9221b90
--- /dev/null
+++ b/Timeline/ClientApp/src/app/user-dialog/user.service.spec.ts
@@ -0,0 +1,12 @@
+import { TestBed } from '@angular/core/testing';
+
+import { UserService } from './user.service';
+
+xdescribe('UserService', () => {
+  beforeEach(() => TestBed.configureTestingModule({}));
+
+  it('should be created', () => {
+    const service: UserService = TestBed.get(UserService);
+    expect(service).toBeTruthy();
+  });
+});
diff --git a/Timeline/ClientApp/src/app/user-dialog/user.service.ts b/Timeline/ClientApp/src/app/user-dialog/user.service.ts
new file mode 100644
index 00000000..1afebc91
--- /dev/null
+++ b/Timeline/ClientApp/src/app/user-dialog/user.service.ts
@@ -0,0 +1,119 @@
+import { Injectable } from '@angular/core';
+import { HttpClient, HttpErrorResponse } from '@angular/common/http';
+import { Observable, of, throwError } from 'rxjs';
+import { map, catchError, retry } from 'rxjs/operators';
+
+export interface UserCredentials {
+  username: string;
+  password: string;
+}
+
+export interface UserInfo {
+  username: string;
+  roles: string[];
+}
+
+export interface CreateTokenResult {
+  token: string;
+  userInfo: UserInfo;
+}
+
+export interface TokenValidationRequest {
+  token: string;
+}
+
+export interface TokenValidationResult {
+  isValid: boolean;
+  userInfo?: UserInfo;
+}
+
+export interface UserLoginState {
+  state: 'nologin' | 'invalid' | 'success';
+  userInfo?: UserInfo;
+}
+
+export class BadNetworkException extends Error {
+  constructor() {
+    super('Network is bad.');
+  }
+}
+
+export class AlreadyLoginException extends Error {
+  constructor() {
+    super('There is already a token saved. Please call validateUserLoginState first.');
+  }
+}
+
+export class BadCredentialsException extends Error {
+  constructor(username: string = null , password: string = null) {
+    super(`Username[${username}] or password[${password}] is wrong.`);
+  }
+}
+
+@Injectable({
+  providedIn: 'root'
+})
+export class UserService {
+
+  private token: string;
+  private userInfo: UserInfo;
+
+  constructor(private httpClient: HttpClient) { }
+
+  validateUserLoginState(): Observable<UserLoginState> {
+    if (this.token === undefined || this.token === null) {
+      return of(<UserLoginState>{ state: 'nologin' });
+    }
+
+    return this.httpClient.post<TokenValidationResult>('/api/User/ValidateToken', <TokenValidationRequest>{ token: this.token }).pipe(
+      retry(3),
+      catchError(error => {
+        console.error('Failed to validate token.');
+        return throwError(error);
+      }),
+      map(result => {
+        if (result.isValid) {
+          this.userInfo = result.userInfo;
+          return <UserLoginState>{
+            state: 'success',
+            userInfo: result.userInfo
+          };
+        } else {
+          this.token = null;
+          this.userInfo = null;
+          return <UserLoginState>{
+            state: 'invalid'
+          };
+        }
+      })
+    );
+  }
+
+  tryLogin(username: string, password: string): Observable<UserInfo> {
+    if (this.token) {
+      return throwError(new AlreadyLoginException());
+    }
+
+    return this.httpClient.post<CreateTokenResult>('/api/User/CreateToken', <UserCredentials>{
+      username, password
+    }).pipe(
+      catchError((error: HttpErrorResponse) => {
+        if (error.error instanceof ErrorEvent) {
+          console.error('An error occurred when login: ' + error.error.message);
+          return throwError(new BadNetworkException());
+        } else if (error.status === 400) {
+          console.error('An error occurred when login: wrong credentials.');
+          return throwError(new BadCredentialsException(username, password));
+        } else {
+          console.error('An unknown error occurred when login: ' + error);
+          return throwError(error);
+        }
+      }),
+      map(result => {
+        this.token = result.token;
+        this.userInfo = result.userInfo;
+        return result.userInfo;
+      })
+    );
+  }
+}