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当我遇到一些 CORS 问题时，我正在将已经在工作的 Angular 10 网络应用程序修改为离子原生应用程序。由于我无法在 BE 上更改任何内容，因此我遇到了 Ionic 的原生 HTTP 插件。

我遵循了 Angular 关于如何制作拦截器的说明以及解释如何实现 HttpClient 和 Ionic 的本机 HTTP 的这篇文章，但我遇到了新问题。

使用文章中的代码，TS 抱怨这一行：

headers: nativeHttpResponse.headers

(property) headers?: HttpHeaders
Type '{ [key: string]: string; }' is missing the following properties from type 'HttpHeaders': headers, normalizedNames, lazyInit, lazyUpdate, and 12 more.ts(2740)
http.d.ts(3406, 9): The expected type comes from property 'headers' which is declared here on type '{ body?: any; headers?: HttpHeaders; status?: number; statusText?: string; url?: string; }'

这是整个 native-http.interceptor.ts：

import { Injectable } from "@angular/core";
import {
  HttpInterceptor,
  HttpRequest,
  HttpHandler,
  HttpEvent,
  HttpResponse,
} from "@angular/common/http";
import { Observable, from } from "rxjs";
import { Platform } from "@ionic/angular";
import { HTTP } from "@ionic-native/http/ngx";

type HttpMethod =
  | "get"
  | "post"
  | "put"
  | "patch"
  | "head"
  | "delete"
  | "upload"
  | "download";

@Injectable()
export class NativeHttpInterceptor implements HttpInterceptor {
  constructor(private nativeHttp: HTTP, private platform: Platform) {}

  public intercept(
    request: HttpRequest<any>,
    next: HttpHandler
  ): Observable<HttpEvent<any>> {
    if (!this.platform.is("cordova")) {
      return next.handle(request);
    }

    return from(this.handleNativeRequest(request));
  }

  private async handleNativeRequest(
    request: HttpRequest<any>
  ): Promise<HttpResponse<any>> {
    const headerKeys = request.headers.keys();
    const headers = {};

    headerKeys.forEach((key) => {
      headers[key] = request.headers.get(key);
    });

    try {
      await this.platform.ready();

      const method = <HttpMethod>request.method.toLowerCase();

      // console.log(‘— Request url’);
      // console.log(request.url)
      // console.log(‘— Request body’);
      // console.log(request.body);

      const nativeHttpResponse = await this.nativeHttp.sendRequest(
        request.url,
        {
          method: method,
          data: request.body,
          headers: headers,
          serializer: "json",
        }
      );

      let body;

      try {
        body = JSON.parse(nativeHttpResponse.data);
      } catch (error) {
        body = { response: nativeHttpResponse.data };
      }

      const response = new HttpResponse({
        body: body,
        status: nativeHttpResponse.status,
        headers: nativeHttpResponse.headers,  <--------
        url: nativeHttpResponse.url,
      });

      // console.log(‘— Response success’)
      // console.log(response);

      return Promise.resolve(response);
    } catch (error) {
      if (!error.status) {
        return Promise.reject(error);
      }

      const response = new HttpResponse({
        body: JSON.parse(error.error),
        status: error.status,
        headers: error.headers,
        url: error.url,
      });

      return Promise.reject(response);
    }
  }
}

这是我的app.module.ts样子：

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { RouterModule } from '@angular/router';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { IonicModule } from '@ionic/angular';
import { HTTP } from '@ionic-native/http/ngx';

import { CoreModule } from './core/core.module';
import { SharedModule } from './shared/shared.module';
import { AppComponent } from './app.component';
import { PageNotFoundComponent } from './shared/page-not-found/page-not-found.component';
import { appRoutes } from './app.routes';


@NgModule({
  imports: [
    BrowserModule,
    BrowserAnimationsModule,
    FormsModule,
    ReactiveFormsModule,
    SharedModule,
    CoreModule,
    RouterModule.forRoot(
      appRoutes
    ),
    IonicModule.forRoot()
  ],
  providers: [HTTP],
  declarations: [
    AppComponent,
    PageNotFoundComponent
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

这是我的core.module.ts（我想使用拦截器的地方）的样子：

import { NgModule } from "@angular/core";
import { CommonModule } from "@angular/common";
import { HTTP_INTERCEPTORS, HttpClientModule } from "@angular/common/http";

import { NativeHttpInterceptor } from "./service/native-http.interceptor";
import { AuthService } from "./service/auth.service";
import { ApiService } from "./service/api.service";
import { AuthGuardService } from "./service/auth-guard.service";
import { AuthInterceptor } from "./service/auth-interceptor";
import { WindowRef } from "./service/window-ref-service";

@NgModule({
  imports: [CommonModule, HttpClientModule],
  providers: [
    {
      provide: HTTP_INTERCEPTORS,
      useClass: NativeHttpInterceptor,
      multi: true,
    },
    AuthService,
    ApiService,
    AuthGuardService,
    WindowRef,
    {
      provide: HTTP_INTERCEPTORS,
      useClass: AuthInterceptor,
      multi: true,
    },
  ],
})
export class CoreModule {}
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1 回答 1

3

AngularHttpRequest有一个设计笨拙的 API。具体来说，它的构造函数需要一个 Angular 的实例HttpHeaders，而不是接受一个标头对象。

因此，在您的情况下，正确的代码是

const response = new HttpResponse({
  body,
  status: nativeHttpResponse.status,
  headers: new HttpHeaders(nativeHttpResponse.headers),
  url: nativeHttpResponse.url
});

我认为这是简单明了的糟糕 API 设计。它偏离了常用的相应API，例如fetch，增加了耦合，并且不是远程惯用的，同时迫使您编写样板。相比之下，Ionic Native 团队采用了正确的方法，将标头指定为对象。

于 2020-09-08T09:36:59.200 回答