@angular/common
Version:
Angular - commonly needed directives and services
238 lines • 30 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { DOCUMENT } from '@angular/common';
import { Inject, Injectable } from '@angular/core';
import { Observable } from 'rxjs';
import { HttpErrorResponse, HttpEventType, HttpResponse } from './response';
import * as i0 from "@angular/core";
// Every request made through JSONP needs a callback name that's unique across the
// whole page. Each request is assigned an id and the callback name is constructed
// from that. The next id to be assigned is tracked in a global variable here that
// is shared among all applications on the page.
let nextRequestId = 0;
/**
* When a pending <script> is unsubscribed we'll move it to this document, so it won't be
* executed.
*/
let foreignDocument;
// Error text given when a JSONP script is injected, but doesn't invoke the callback
// passed in its URL.
export const JSONP_ERR_NO_CALLBACK = 'JSONP injected script did not invoke callback.';
// Error text given when a request is passed to the JsonpClientBackend that doesn't
// have a request method JSONP.
export const JSONP_ERR_WRONG_METHOD = 'JSONP requests must use JSONP request method.';
export const JSONP_ERR_WRONG_RESPONSE_TYPE = 'JSONP requests must use Json response type.';
// Error text given when a request is passed to the JsonpClientBackend that has
// headers set
export const JSONP_ERR_HEADERS_NOT_SUPPORTED = 'JSONP requests do not support headers.';
/**
* DI token/abstract type representing a map of JSONP callbacks.
*
* In the browser, this should always be the `window` object.
*
*
*/
export class JsonpCallbackContext {
}
/**
* Processes an `HttpRequest` with the JSONP method,
* by performing JSONP style requests.
* @see `HttpHandler`
* @see `HttpXhrBackend`
*
* @publicApi
*/
export class JsonpClientBackend {
constructor(callbackMap, document) {
this.callbackMap = callbackMap;
this.document = document;
/**
* A resolved promise that can be used to schedule microtasks in the event handlers.
*/
this.resolvedPromise = Promise.resolve();
}
/**
* Get the name of the next callback method, by incrementing the global `nextRequestId`.
*/
nextCallback() {
return `ng_jsonp_callback_${nextRequestId++}`;
}
/**
* Processes a JSONP request and returns an event stream of the results.
* @param req The request object.
* @returns An observable of the response events.
*
*/
handle(req) {
// Firstly, check both the method and response type. If either doesn't match
// then the request was improperly routed here and cannot be handled.
if (req.method !== 'JSONP') {
throw new Error(JSONP_ERR_WRONG_METHOD);
}
else if (req.responseType !== 'json') {
throw new Error(JSONP_ERR_WRONG_RESPONSE_TYPE);
}
// Check the request headers. JSONP doesn't support headers and
// cannot set any that were supplied.
if (req.headers.keys().length > 0) {
throw new Error(JSONP_ERR_HEADERS_NOT_SUPPORTED);
}
// Everything else happens inside the Observable boundary.
return new Observable((observer) => {
// The first step to make a request is to generate the callback name, and replace the
// callback placeholder in the URL with the name. Care has to be taken here to ensure
// a trailing &, if matched, gets inserted back into the URL in the correct place.
const callback = this.nextCallback();
const url = req.urlWithParams.replace(/=JSONP_CALLBACK(&|$)/, `=${callback}$1`);
// Construct the <script> tag and point it at the URL.
const node = this.document.createElement('script');
node.src = url;
// A JSONP request requires waiting for multiple callbacks. These variables
// are closed over and track state across those callbacks.
// The response object, if one has been received, or null otherwise.
let body = null;
// Whether the response callback has been called.
let finished = false;
// Set the response callback in this.callbackMap (which will be the window
// object in the browser. The script being loaded via the <script> tag will
// eventually call this callback.
this.callbackMap[callback] = (data) => {
// Data has been received from the JSONP script. Firstly, delete this callback.
delete this.callbackMap[callback];
// Set state to indicate data was received.
body = data;
finished = true;
};
// cleanup() is a utility closure that removes the <script> from the page and
// the response callback from the window. This logic is used in both the
// success, error, and cancellation paths, so it's extracted out for convenience.
const cleanup = () => {
// Remove the <script> tag if it's still on the page.
if (node.parentNode) {
node.parentNode.removeChild(node);
}
// Remove the response callback from the callbackMap (window object in the
// browser).
delete this.callbackMap[callback];
};
// onLoad() is the success callback which runs after the response callback
// if the JSONP script loads successfully. The event itself is unimportant.
// If something went wrong, onLoad() may run without the response callback
// having been invoked.
const onLoad = (event) => {
// We wrap it in an extra Promise, to ensure the microtask
// is scheduled after the loaded endpoint has executed any potential microtask itself,
// which is not guaranteed in Internet Explorer and EdgeHTML. See issue #39496
this.resolvedPromise.then(() => {
// Cleanup the page.
cleanup();
// Check whether the response callback has run.
if (!finished) {
// It hasn't, something went wrong with the request. Return an error via
// the Observable error path. All JSONP errors have status 0.
observer.error(new HttpErrorResponse({
url,
status: 0,
statusText: 'JSONP Error',
error: new Error(JSONP_ERR_NO_CALLBACK),
}));
return;
}
// Success. body either contains the response body or null if none was
// returned.
observer.next(new HttpResponse({
body,
status: 200 /* HttpStatusCode.Ok */,
statusText: 'OK',
url,
}));
// Complete the stream, the response is over.
observer.complete();
});
};
// onError() is the error callback, which runs if the script returned generates
// a Javascript error. It emits the error via the Observable error channel as
// a HttpErrorResponse.
const onError = (error) => {
cleanup();
// Wrap the error in a HttpErrorResponse.
observer.error(new HttpErrorResponse({
error,
status: 0,
statusText: 'JSONP Error',
url,
}));
};
// Subscribe to both the success (load) and error events on the <script> tag,
// and add it to the page.
node.addEventListener('load', onLoad);
node.addEventListener('error', onError);
this.document.body.appendChild(node);
// The request has now been successfully sent.
observer.next({ type: HttpEventType.Sent });
// Cancellation handler.
return () => {
if (!finished) {
this.removeListeners(node);
}
// And finally, clean up the page.
cleanup();
};
});
}
removeListeners(script) {
// Issue #34818
// Changing <script>'s ownerDocument will prevent it from execution.
// https://html.spec.whatwg.org/multipage/scripting.html#execute-the-script-block
if (!foreignDocument) {
foreignDocument = this.document.implementation.createHTMLDocument();
}
foreignDocument.adoptNode(script);
}
}
JsonpClientBackend.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "14.1.0", ngImport: i0, type: JsonpClientBackend, deps: [{ token: JsonpCallbackContext }, { token: DOCUMENT }], target: i0.ɵɵFactoryTarget.Injectable });
JsonpClientBackend.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "14.1.0", ngImport: i0, type: JsonpClientBackend });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "14.1.0", ngImport: i0, type: JsonpClientBackend, decorators: [{
type: Injectable
}], ctorParameters: function () { return [{ type: JsonpCallbackContext }, { type: undefined, decorators: [{
type: Inject,
args: [DOCUMENT]
}] }]; } });
/**
* Identifies requests with the method JSONP and
* shifts them to the `JsonpClientBackend`.
*
* @see `HttpInterceptor`
*
* @publicApi
*/
export class JsonpInterceptor {
constructor(jsonp) {
this.jsonp = jsonp;
}
/**
* Identifies and handles a given JSONP request.
* @param req The outgoing request object to handle.
* @param next The next interceptor in the chain, or the backend
* if no interceptors remain in the chain.
* @returns An observable of the event stream.
*/
intercept(req, next) {
if (req.method === 'JSONP') {
return this.jsonp.handle(req);
}
// Fall through for normal HTTP requests.
return next.handle(req);
}
}
JsonpInterceptor.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "14.1.0", ngImport: i0, type: JsonpInterceptor, deps: [{ token: JsonpClientBackend }], target: i0.ɵɵFactoryTarget.Injectable });
JsonpInterceptor.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "14.1.0", ngImport: i0, type: JsonpInterceptor });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "14.1.0", ngImport: i0, type: JsonpInterceptor, decorators: [{
type: Injectable
}], ctorParameters: function () { return [{ type: JsonpClientBackend }]; } });
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {DOCUMENT} from '@angular/common';\nimport {Inject, Injectable} from '@angular/core';\nimport {Observable, Observer} from 'rxjs';\n\nimport {HttpBackend, HttpHandler} from './backend';\nimport {HttpRequest} from './request';\nimport {HttpErrorResponse, HttpEvent, HttpEventType, HttpResponse, HttpStatusCode} from './response';\n\n\n// Every request made through JSONP needs a callback name that's unique across the\n// whole page. Each request is assigned an id and the callback name is constructed\n// from that. The next id to be assigned is tracked in a global variable here that\n// is shared among all applications on the page.\nlet nextRequestId: number = 0;\n\n/**\n * When a pending <script> is unsubscribed we'll move it to this document, so it won't be\n * executed.\n */\nlet foreignDocument: Document|undefined;\n\n// Error text given when a JSONP script is injected, but doesn't invoke the callback\n// passed in its URL.\nexport const JSONP_ERR_NO_CALLBACK = 'JSONP injected script did not invoke callback.';\n\n// Error text given when a request is passed to the JsonpClientBackend that doesn't\n// have a request method JSONP.\nexport const JSONP_ERR_WRONG_METHOD = 'JSONP requests must use JSONP request method.';\nexport const JSONP_ERR_WRONG_RESPONSE_TYPE = 'JSONP requests must use Json response type.';\n\n// Error text given when a request is passed to the JsonpClientBackend that has\n// headers set\nexport const JSONP_ERR_HEADERS_NOT_SUPPORTED = 'JSONP requests do not support headers.';\n\n/**\n * DI token/abstract type representing a map of JSONP callbacks.\n *\n * In the browser, this should always be the `window` object.\n *\n *\n */\nexport abstract class JsonpCallbackContext {\n  [key: string]: (data: any) => void;\n}\n\n/**\n * Processes an `HttpRequest` with the JSONP method,\n * by performing JSONP style requests.\n * @see `HttpHandler`\n * @see `HttpXhrBackend`\n *\n * @publicApi\n */\n@Injectable()\nexport class JsonpClientBackend implements HttpBackend {\n  /**\n   * A resolved promise that can be used to schedule microtasks in the event handlers.\n   */\n  private readonly resolvedPromise = Promise.resolve();\n\n  constructor(private callbackMap: JsonpCallbackContext, @Inject(DOCUMENT) private document: any) {}\n\n  /**\n   * Get the name of the next callback method, by incrementing the global `nextRequestId`.\n   */\n  private nextCallback(): string {\n    return `ng_jsonp_callback_${nextRequestId++}`;\n  }\n\n  /**\n   * Processes a JSONP request and returns an event stream of the results.\n   * @param req The request object.\n   * @returns An observable of the response events.\n   *\n   */\n  handle(req: HttpRequest<never>): Observable<HttpEvent<any>> {\n    // Firstly, check both the method and response type. If either doesn't match\n    // then the request was improperly routed here and cannot be handled.\n    if (req.method !== 'JSONP') {\n      throw new Error(JSONP_ERR_WRONG_METHOD);\n    } else if (req.responseType !== 'json') {\n      throw new Error(JSONP_ERR_WRONG_RESPONSE_TYPE);\n    }\n\n    // Check the request headers. JSONP doesn't support headers and\n    // cannot set any that were supplied.\n    if (req.headers.keys().length > 0) {\n      throw new Error(JSONP_ERR_HEADERS_NOT_SUPPORTED);\n    }\n\n    // Everything else happens inside the Observable boundary.\n    return new Observable<HttpEvent<any>>((observer: Observer<HttpEvent<any>>) => {\n      // The first step to make a request is to generate the callback name, and replace the\n      // callback placeholder in the URL with the name. Care has to be taken here to ensure\n      // a trailing &, if matched, gets inserted back into the URL in the correct place.\n      const callback = this.nextCallback();\n      const url = req.urlWithParams.replace(/=JSONP_CALLBACK(&|$)/, `=${callback}$1`);\n\n      // Construct the <script> tag and point it at the URL.\n      const node = this.document.createElement('script');\n      node.src = url;\n\n      // A JSONP request requires waiting for multiple callbacks. These variables\n      // are closed over and track state across those callbacks.\n\n      // The response object, if one has been received, or null otherwise.\n      let body: any|null = null;\n\n      // Whether the response callback has been called.\n      let finished: boolean = false;\n\n      // Set the response callback in this.callbackMap (which will be the window\n      // object in the browser. The script being loaded via the <script> tag will\n      // eventually call this callback.\n      this.callbackMap[callback] = (data?: any) => {\n        // Data has been received from the JSONP script. Firstly, delete this callback.\n        delete this.callbackMap[callback];\n\n        // Set state to indicate data was received.\n        body = data;\n        finished = true;\n      };\n\n      // cleanup() is a utility closure that removes the <script> from the page and\n      // the response callback from the window. This logic is used in both the\n      // success, error, and cancellation paths, so it's extracted out for convenience.\n      const cleanup = () => {\n        // Remove the <script> tag if it's still on the page.\n        if (node.parentNode) {\n          node.parentNode.removeChild(node);\n        }\n\n        // Remove the response callback from the callbackMap (window object in the\n        // browser).\n        delete this.callbackMap[callback];\n      };\n\n      // onLoad() is the success callback which runs after the response callback\n      // if the JSONP script loads successfully. The event itself is unimportant.\n      // If something went wrong, onLoad() may run without the response callback\n      // having been invoked.\n      const onLoad = (event: Event) => {\n        // We wrap it in an extra Promise, to ensure the microtask\n        // is scheduled after the loaded endpoint has executed any potential microtask itself,\n        // which is not guaranteed in Internet Explorer and EdgeHTML. See issue #39496\n        this.resolvedPromise.then(() => {\n          // Cleanup the page.\n          cleanup();\n\n          // Check whether the response callback has run.\n          if (!finished) {\n            // It hasn't, something went wrong with the request. Return an error via\n            // the Observable error path. All JSONP errors have status 0.\n            observer.error(new HttpErrorResponse({\n              url,\n              status: 0,\n              statusText: 'JSONP Error',\n              error: new Error(JSONP_ERR_NO_CALLBACK),\n            }));\n            return;\n          }\n\n          // Success. body either contains the response body or null if none was\n          // returned.\n          observer.next(new HttpResponse({\n            body,\n            status: HttpStatusCode.Ok,\n            statusText: 'OK',\n            url,\n          }));\n\n          // Complete the stream, the response is over.\n          observer.complete();\n        });\n      };\n\n      // onError() is the error callback, which runs if the script returned generates\n      // a Javascript error. It emits the error via the Observable error channel as\n      // a HttpErrorResponse.\n      const onError: any = (error: Error) => {\n        cleanup();\n\n        // Wrap the error in a HttpErrorResponse.\n        observer.error(new HttpErrorResponse({\n          error,\n          status: 0,\n          statusText: 'JSONP Error',\n          url,\n        }));\n      };\n\n      // Subscribe to both the success (load) and error events on the <script> tag,\n      // and add it to the page.\n      node.addEventListener('load', onLoad);\n      node.addEventListener('error', onError);\n      this.document.body.appendChild(node);\n\n      // The request has now been successfully sent.\n      observer.next({type: HttpEventType.Sent});\n\n      // Cancellation handler.\n      return () => {\n        if (!finished) {\n          this.removeListeners(node);\n        }\n\n        // And finally, clean up the page.\n        cleanup();\n      };\n    });\n  }\n\n  private removeListeners(script: HTMLScriptElement): void {\n    // Issue #34818\n    // Changing <script>'s ownerDocument will prevent it from execution.\n    // https://html.spec.whatwg.org/multipage/scripting.html#execute-the-script-block\n    if (!foreignDocument) {\n      foreignDocument = (this.document.implementation as DOMImplementation).createHTMLDocument();\n    }\n    foreignDocument.adoptNode(script);\n  }\n}\n\n/**\n * Identifies requests with the method JSONP and\n * shifts them to the `JsonpClientBackend`.\n *\n * @see `HttpInterceptor`\n *\n * @publicApi\n */\n@Injectable()\nexport class JsonpInterceptor {\n  constructor(private jsonp: JsonpClientBackend) {}\n\n  /**\n   * Identifies and handles a given JSONP request.\n   * @param req The outgoing request object to handle.\n   * @param next The next interceptor in the chain, or the backend\n   * if no interceptors remain in the chain.\n   * @returns An observable of the event stream.\n   */\n  intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {\n    if (req.method === 'JSONP') {\n      return this.jsonp.handle(req as HttpRequest<never>);\n    }\n    // Fall through for normal HTTP requests.\n    return next.handle(req);\n  }\n}\n"]}