add exception service

src/app/auth.guard.ts

@@ -13,7 +13,11 @@ export class AuthGuard implements CanActivate {
   constructor(private userInfo: UserInfoService) {}
 
   async check() {
-    return !!this.userInfo.user;
+    if (!this.userInfo.user) {
+      this.userInfo.login();
+      return false;
+    }
+    return true;
   }
 
   canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot) {

src/app/exception.service.spec.ts

+import { TestBed } from '@angular/core/testing';
+
+import { ExceptionService } from './exception.service';
+
+describe('ExceptionService', () => {
+  let service: ExceptionService;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({});
+    service = TestBed.inject(ExceptionService);
+  });
+
+  it('should be created', () => {
+    expect(service).toBeTruthy();
+  });
+});

src/app/exception.service.ts

+import { Injectable } from '@angular/core';
+import { UserInfoService } from './user-info.service';
+import { ToastService } from './toast.service';
+import { HttpErrorResponse } from '@angular/common/http';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class ExceptionService {
+  constructor(private toast: ToastService, private userInfo: UserInfoService) {}
+
+  handle(e: any, noRedirect = false) {
+    const error = e as HttpErrorResponse;
+    if (error.status === 401) {
+      if (!noRedirect) {
+        return undefined;
+      }
+      this.toast.warn('没有登录。');
+      this.userInfo.login();
+    } else {
+      this.toast.error(error.error?.message || error.message);
+    }
+    return undefined;
+  }
+
+  async run<T>(fun: () => T | Promise<T>): Promise<T | undefined> {
+    try {
+      return await fun();
+    } catch (e) {
+      this.handle(e);
+      return undefined;
+    }
+  }
+}

src/app/user-info.service.ts

@@ -3,6 +3,7 @@ import { MyCardSSOUser } from './utility/MyCardSSOUser';
 import { ActivatedRoute, Router } from '@angular/router';
 import { loginUrl } from './utility/login-url';
 import { Buffer } from 'buffer';
+import { ToastService } from './toast.service';
 
 @Injectable({
   providedIn: 'root',