我需要在用户登录后为每个后续请求设置一些授权头。
为特定请求设置头信息，
import {Headers} from 'angular2/http';
var headers = new Headers();
headers.append(headerName, value);
// HTTP POST using these headers
this.http.post(url, data, {
headers: headers
})
// do something with the response
参考
但是，以这种方式为每个请求手动设置请求头是不可行的。
我如何设置头设置一旦用户登录，也删除注销这些头?
当前回答
像下面这样保持独立的服务怎么样
import {Injectable} from '@angular/core';
import {Headers, Http, RequestOptions} from '@angular/http';
@Injectable()
export class HttpClientService extends RequestOptions {
constructor(private requestOptionArgs:RequestOptions) {
super();
}
addHeader(headerName: string, headerValue: string ){
(this.requestOptionArgs.headers as Headers).set(headerName, headerValue);
}
}
当你从另一个地方调用这个时，使用this. httpclientservice。addHeader("Authorization"， " holder " + this.tok);
您将看到添加的标题，例如:-授权如下
其他回答
像下面这样保持独立的服务怎么样
import {Injectable} from '@angular/core';
import {Headers, Http, RequestOptions} from '@angular/http';
@Injectable()
export class HttpClientService extends RequestOptions {
constructor(private requestOptionArgs:RequestOptions) {
super();
}
addHeader(headerName: string, headerValue: string ){
(this.requestOptionArgs.headers as Headers).set(headerName, headerValue);
}
}
当你从另一个地方调用这个时，使用this. httpclientservice。addHeader("Authorization"， " holder " + this.tok);
您将看到添加的标题，例如:-授权如下
你可以在你的路由中使用canActive，如下所示:
import { Injectable } from '@angular/core';
import { Router } from '@angular/router';
import { CanActivate } from '@angular/router';
import { AuthService } from './auth.service';
@Injectable()
export class AuthGuard implements CanActivate {
constructor(private auth: AuthService, private router: Router) {}
canActivate() {
// If user is not logged in we'll send them to the homepage
if (!this.auth.loggedIn()) {
this.router.navigate(['']);
return false;
}
return true;
}
}
const appRoutes: Routes = [
{
path: '', redirectTo: '/deals', pathMatch: 'full'
},
{
path: 'special',
component: PrivateDealsComponent,
/* We'll use the canActivate API and pass in our AuthGuard.
Now any time the /special route is hit, the AuthGuard will run
first to make sure the user is logged in before activating and
loading this route. */
canActivate: [AuthGuard]
}
];
摘自:https://auth0.com/blog/angular-2-authentication
const headers = new HttpHeaders()
.set('content-type', 'application/json')
.set('x-functions-key', '');
return this.http.get<Person[]>(baseUrl, {
headers: headers,
});
使用append方法将新值附加到现有值集
headers.append('Access-Control-Allow-Origin', '*')
HTTP拦截器是实现这一点的正确方法。在这里没有看到关于如何完全实现它的适当文档，所以我包含了谷歌官方指南的链接。在实现之前，我已经通读了文档，因为在安全性和使用多个拦截器包方面存在许多潜在的缺陷。
https://angular.io/guide/http#intercepting-requests-and-responses
import { Injectable } from '@angular/core';
import {
HttpEvent, HttpInterceptor, HttpHandler, HttpRequest
} from '@angular/common/http';
import { Observable } from 'rxjs';
/** Pass untouched request through to the next request handler. */
@Injectable()
export class NoopInterceptor implements HttpInterceptor {
intercept(req: HttpRequest<any>, next: HttpHandler):
Observable<HttpEvent<any>> {
return next.handle(req);
}
}
从Angular 4.3开始，HTTP拦截器现在可以通过新的HttpClient @angular/common/ HTTP使用了。X版本及更高版本。
现在为每个请求添加头文件非常简单:
import {
HttpEvent,
HttpInterceptor,
HttpHandler,
HttpRequest,
} from '@angular/common/http';
import { Observable } from 'rxjs';
import { Injectable } from '@angular/core';
@Injectable()
export class AddHeaderInterceptor implements HttpInterceptor {
intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
// Clone the request to add the new header
const clonedRequest = req.clone({ headers: req.headers.append('Authorization', 'Bearer 123') });
// Pass the cloned request instead of the original request to the next handle
return next.handle(clonedRequest);
}
}
有一个不可变性的原则，这就是为什么在设置新内容之前需要克隆请求。
由于编辑头部是一个非常常见的任务，实际上有一个快捷方式(在克隆请求时):
const clonedRequest = req.clone({ setHeaders: { Authorization: 'Bearer 123' } });
创建拦截器之后，你应该使用HTTP_INTERCEPTORS提供的方法注册它。
import { HTTP_INTERCEPTORS } from '@angular/common/http';
@NgModule({
providers: [{
provide: HTTP_INTERCEPTORS,
useClass: AddHeaderInterceptor,
multi: true,
}],
})
export class AppModule {}
