53 lines
1.5 KiB
TypeScript
53 lines
1.5 KiB
TypeScript
import {HttpEvent, HttpHandler, HttpInterceptor, HttpRequest, HttpResponse} from '@angular/common/http';
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import {Injectable} from '@angular/core';
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import {Observable} from 'rxjs';
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import {tap} from 'rxjs/operators';
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import {NGXLogger} from 'ngx-logger';
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@Injectable({
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providedIn: 'root'
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})
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/**
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* The InterceptorService intercepts EVERY http event.
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*/
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export class InterceptorService implements HttpInterceptor {
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constructor(private logger: NGXLogger) {
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}
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/**
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* Intercepts every HTTP request and for example adds a token
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* @param req http request
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* @param next http response handler
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*/
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intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
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// TODO get the real token
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const token = 'A_TOKEN';
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// the original request is immutable, so we need to clone it
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req = req.clone({
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setHeaders: {
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// FIXME e.g. if Bearer is used
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Authorization: `Bearer ${token}`
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}
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});
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this.logger.debug('Interceptor works');
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// pipe the response observable
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return next.handle(req).pipe(
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// perform a side effect for every emission on the source Observable
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// return an Observable that is identical to the source
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tap(event => {
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// check if it is the response message
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if (event instanceof HttpResponse) {
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// TODO so something if necessary
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}
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}, error => {
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// TODO handle error here
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this.logger.error('HTTP Response interception error', error);
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})
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);
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}
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}
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