角拦截器排除特定的URL

问题描述

我正在编写拦截器，这样我就不必在调用我的Web api的每个服务中处理标头.问题是我的99％的呼叫需要1个特定的标头集，而其他1％的呼叫只需要其中1个标头，并且无法与其他存在的标头一起使用.知道这一点后，我的想法是制作2个拦截器，第一个将添加它们全部使用的1个标头，第二个将添加其余的标头，第二个将不包含1％的标头.

I am writing interceptors such that I don't have to handle the headers in every service calling my web api. The problem with this is that 99% of my calls require 1 specific set of headers, but the other 1% only require 1 of the headers and will not work with the others present. With this being known my idea is to make 2 interceptors, the first will add the 1 header that they all use and the second will add the rest of the headers, with the second excluding the 1%.

以下是我打算排除1％的方法的方法，该方法可以正常工作，但是我想看看是否有更好的方法可以解决此问题:

The following is how I am going about excluding the 1%, which works, but I want to see if there is a better way of going about this:

intercept(request: HttpRequest<any>, next:HttpHandler: Observable<HttpEvent<any>> {
  let position = request.url.indexOf('api/');
  if (position > 0){
    let destination: string = request.url.substr(position + 4);
    let matchFound: boolean = false;

    for (let address of this.addressesToUse){
      if (new RegExp(address).test(destination)){
        matchFound = true;
        break;
      }
    }

    if (!matchFound){
      ...DO WORK to add the headers
    }
  }

推荐答案

我最后要做的是拥有一个我不想在拦截器中使用的url数组(以Regex格式):

What I wound up doing is having an array of urls (in Regex Format) that I did not want to be used in the interceptor like so:

import { Injectable } from '@angular/core';
import { HttpEvent, HttpInterceptor, HttpHandler, HttpRequest } from '@angular/common/http';
import { Observable } from 'rxjs';

@Injectable()
export class AddCustomHeadersInterceptor implements HttpInterceptor {
  urlsToNotUse: Array<string>;

  constructor(
  ) {

    this.urlsToNotUse= [
      'myController1/myAction1/.+',
      'myController1/myAction2/.+',
      'myController1/myAction3'
    ];
  }

  intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    if (this.isValidRequestForInterceptor(request.url)) {
      let modifiedRequest = request.clone({
        setHeaders: {
          //DO WORK HERE
        }
      });

      return next.handle(modifiedRequest);
    }
    return next.handle(request);
  }

  private isValidRequestForInterceptor(requestUrl: string): boolean {
    let positionIndicator: string = 'api/';
    let position = requestUrl.indexOf(positionIndicator);
    if (position > 0) {
      let destination: string = requestUrl.substr(position + positionIndicator.length);
      for (let address of this.urlsToNotUse) {
        if (new RegExp(address).test(destination)) {
          return false;
        }
      }
    }
    return true;
  }
}

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