@angular/common
Version:
Angular - commonly needed directives and services
306 lines • 42.8 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 { Injectable } from '@angular/core';
import { Observable } from 'rxjs';
import { HttpHeaders } from './headers';
import { HttpErrorResponse, HttpEventType, HttpHeaderResponse, HttpResponse } from './response';
const XSSI_PREFIX = /^\)\]\}',?\n/;
/**
* Determine an appropriate URL for the response, by checking either
* XMLHttpRequest.responseURL or the X-Request-URL header.
*/
function getResponseUrl(xhr) {
if ('responseURL' in xhr && xhr.responseURL) {
return xhr.responseURL;
}
if (/^X-Request-URL:/m.test(xhr.getAllResponseHeaders())) {
return xhr.getResponseHeader('X-Request-URL');
}
return null;
}
/**
* A wrapper around the `XMLHttpRequest` constructor.
*
* @publicApi
*/
export class XhrFactory {
}
/**
* A factory for `HttpXhrBackend` that uses the `XMLHttpRequest` browser API.
*
*/
export class BrowserXhr {
constructor() { }
build() {
return (new XMLHttpRequest());
}
}
BrowserXhr.decorators = [
{ type: Injectable }
];
BrowserXhr.ctorParameters = () => [];
/**
* Uses `XMLHttpRequest` to send requests to a backend server.
* @see `HttpHandler`
* @see `JsonpClientBackend`
*
* @publicApi
*/
export class HttpXhrBackend {
constructor(xhrFactory) {
this.xhrFactory = xhrFactory;
}
/**
* Processes a request and returns a stream of response events.
* @param req The request object.
* @returns An observable of the response events.
*/
handle(req) {
// Quick check to give a better error message when a user attempts to use
// HttpClient.jsonp() without installing the HttpClientJsonpModule
if (req.method === 'JSONP') {
throw new Error(`Attempted to construct Jsonp request without HttpClientJsonpModule installed.`);
}
// Everything happens on Observable subscription.
return new Observable((observer) => {
// Start by setting up the XHR object with request method, URL, and withCredentials flag.
const xhr = this.xhrFactory.build();
xhr.open(req.method, req.urlWithParams);
if (!!req.withCredentials) {
xhr.withCredentials = true;
}
// Add all the requested headers.
req.headers.forEach((name, values) => xhr.setRequestHeader(name, values.join(',')));
// Add an Accept header if one isn't present already.
if (!req.headers.has('Accept')) {
xhr.setRequestHeader('Accept', 'application/json, text/plain, */*');
}
// Auto-detect the Content-Type header if one isn't present already.
if (!req.headers.has('Content-Type')) {
const detectedType = req.detectContentTypeHeader();
// Sometimes Content-Type detection fails.
if (detectedType !== null) {
xhr.setRequestHeader('Content-Type', detectedType);
}
}
// Set the responseType if one was requested.
if (req.responseType) {
const responseType = req.responseType.toLowerCase();
// JSON responses need to be processed as text. This is because if the server
// returns an XSSI-prefixed JSON response, the browser will fail to parse it,
// xhr.response will be null, and xhr.responseText cannot be accessed to
// retrieve the prefixed JSON data in order to strip the prefix. Thus, all JSON
// is parsed by first requesting text and then applying JSON.parse.
xhr.responseType = ((responseType !== 'json') ? responseType : 'text');
}
// Serialize the request body if one is present. If not, this will be set to null.
const reqBody = req.serializeBody();
// If progress events are enabled, response headers will be delivered
// in two events - the HttpHeaderResponse event and the full HttpResponse
// event. However, since response headers don't change in between these
// two events, it doesn't make sense to parse them twice. So headerResponse
// caches the data extracted from the response whenever it's first parsed,
// to ensure parsing isn't duplicated.
let headerResponse = null;
// partialFromXhr extracts the HttpHeaderResponse from the current XMLHttpRequest
// state, and memoizes it into headerResponse.
const partialFromXhr = () => {
if (headerResponse !== null) {
return headerResponse;
}
// Read status and normalize an IE9 bug (https://bugs.jquery.com/ticket/1450).
const status = xhr.status === 1223 ? 204 : xhr.status;
const statusText = xhr.statusText || 'OK';
// Parse headers from XMLHttpRequest - this step is lazy.
const headers = new HttpHeaders(xhr.getAllResponseHeaders());
// Read the response URL from the XMLHttpResponse instance and fall back on the
// request URL.
const url = getResponseUrl(xhr) || req.url;
// Construct the HttpHeaderResponse and memoize it.
headerResponse = new HttpHeaderResponse({ headers, status, statusText, url });
return headerResponse;
};
// Next, a few closures are defined for the various events which XMLHttpRequest can
// emit. This allows them to be unregistered as event listeners later.
// First up is the load event, which represents a response being fully available.
const onLoad = () => {
// Read response state from the memoized partial data.
let { headers, status, statusText, url } = partialFromXhr();
// The body will be read out if present.
let body = null;
if (status !== 204) {
// Use XMLHttpRequest.response if set, responseText otherwise.
body = (typeof xhr.response === 'undefined') ? xhr.responseText : xhr.response;
}
// Normalize another potential bug (this one comes from CORS).
if (status === 0) {
status = !!body ? 200 : 0;
}
// ok determines whether the response will be transmitted on the event or
// error channel. Unsuccessful status codes (not 2xx) will always be errors,
// but a successful status code can still result in an error if the user
// asked for JSON data and the body cannot be parsed as such.
let ok = status >= 200 && status < 300;
// Check whether the body needs to be parsed as JSON (in many cases the browser
// will have done that already).
if (req.responseType === 'json' && typeof body === 'string') {
// Save the original body, before attempting XSSI prefix stripping.
const originalBody = body;
body = body.replace(XSSI_PREFIX, '');
try {
// Attempt the parse. If it fails, a parse error should be delivered to the user.
body = body !== '' ? JSON.parse(body) : null;
}
catch (error) {
// Since the JSON.parse failed, it's reasonable to assume this might not have been a
// JSON response. Restore the original body (including any XSSI prefix) to deliver
// a better error response.
body = originalBody;
// If this was an error request to begin with, leave it as a string, it probably
// just isn't JSON. Otherwise, deliver the parsing error to the user.
if (ok) {
// Even though the response status was 2xx, this is still an error.
ok = false;
// The parse error contains the text of the body that failed to parse.
body = { error, text: body };
}
}
}
if (ok) {
// A successful response is delivered on the event stream.
observer.next(new HttpResponse({
body,
headers,
status,
statusText,
url: url || undefined,
}));
// The full body has been received and delivered, no further events
// are possible. This request is complete.
observer.complete();
}
else {
// An unsuccessful request is delivered on the error channel.
observer.error(new HttpErrorResponse({
// The error in this case is the response body (error from the server).
error: body,
headers,
status,
statusText,
url: url || undefined,
}));
}
};
// The onError callback is called when something goes wrong at the network level.
// Connection timeout, DNS error, offline, etc. These are actual errors, and are
// transmitted on the error channel.
const onError = (error) => {
const { url } = partialFromXhr();
const res = new HttpErrorResponse({
error,
status: xhr.status || 0,
statusText: xhr.statusText || 'Unknown Error',
url: url || undefined,
});
observer.error(res);
};
// The sentHeaders flag tracks whether the HttpResponseHeaders event
// has been sent on the stream. This is necessary to track if progress
// is enabled since the event will be sent on only the first download
// progerss event.
let sentHeaders = false;
// The download progress event handler, which is only registered if
// progress events are enabled.
const onDownProgress = (event) => {
// Send the HttpResponseHeaders event if it hasn't been sent already.
if (!sentHeaders) {
observer.next(partialFromXhr());
sentHeaders = true;
}
// Start building the download progress event to deliver on the response
// event stream.
let progressEvent = {
type: HttpEventType.DownloadProgress,
loaded: event.loaded,
};
// Set the total number of bytes in the event if it's available.
if (event.lengthComputable) {
progressEvent.total = event.total;
}
// If the request was for text content and a partial response is
// available on XMLHttpRequest, include it in the progress event
// to allow for streaming reads.
if (req.responseType === 'text' && !!xhr.responseText) {
progressEvent.partialText = xhr.responseText;
}
// Finally, fire the event.
observer.next(progressEvent);
};
// The upload progress event handler, which is only registered if
// progress events are enabled.
const onUpProgress = (event) => {
// Upload progress events are simpler. Begin building the progress
// event.
let progress = {
type: HttpEventType.UploadProgress,
loaded: event.loaded,
};
// If the total number of bytes being uploaded is available, include
// it.
if (event.lengthComputable) {
progress.total = event.total;
}
// Send the event.
observer.next(progress);
};
// By default, register for load and error events.
xhr.addEventListener('load', onLoad);
xhr.addEventListener('error', onError);
xhr.addEventListener('timeout', onError);
xhr.addEventListener('abort', onError);
// Progress events are only enabled if requested.
if (req.reportProgress) {
// Download progress is always enabled if requested.
xhr.addEventListener('progress', onDownProgress);
// Upload progress depends on whether there is a body to upload.
if (reqBody !== null && xhr.upload) {
xhr.upload.addEventListener('progress', onUpProgress);
}
}
// Fire the request, and notify the event stream that it was fired.
xhr.send(reqBody);
observer.next({ type: HttpEventType.Sent });
// This is the return from the Observable function, which is the
// request cancellation handler.
return () => {
// On a cancellation, remove all registered event listeners.
xhr.removeEventListener('error', onError);
xhr.removeEventListener('abort', onError);
xhr.removeEventListener('load', onLoad);
xhr.removeEventListener('timeout', onError);
if (req.reportProgress) {
xhr.removeEventListener('progress', onDownProgress);
if (reqBody !== null && xhr.upload) {
xhr.upload.removeEventListener('progress', onUpProgress);
}
}
// Finally, abort the in-flight request.
if (xhr.readyState !== xhr.DONE) {
xhr.abort();
}
};
});
}
}
HttpXhrBackend.decorators = [
{ type: Injectable }
];
HttpXhrBackend.ctorParameters = () => [
{ type: XhrFactory }
];
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xhr.getResponseHeader('X-Request-URL');\n  }\n  return null;\n}\n\n/**\n * A wrapper around the `XMLHttpRequest` constructor.\n *\n * @publicApi\n */\nexport abstract class XhrFactory {\n  abstract build(): XMLHttpRequest;\n}\n\n/**\n * A factory for `HttpXhrBackend` that uses the `XMLHttpRequest` browser API.\n *\n */\n@Injectable()\nexport class BrowserXhr implements XhrFactory {\n  constructor() {}\n  build(): any {\n    return <any>(new XMLHttpRequest());\n  }\n}\n\n/**\n * Tracks a response from the server that does not yet have a body.\n */\ninterface PartialResponse {\n  headers: HttpHeaders;\n  status: number;\n  statusText: string;\n  url: string;\n}\n\n/**\n * Uses `XMLHttpRequest` to send requests to a backend server.\n * @see `HttpHandler`\n * @see `JsonpClientBackend`\n *\n * @publicApi\n */\n@Injectable()\nexport class HttpXhrBackend implements HttpBackend {\n  constructor(private xhrFactory: XhrFactory) {}\n\n  /**\n   * Processes a request and returns a stream of response events.\n   * @param req The request object.\n   * @returns An observable of the response events.\n   */\n  handle(req: HttpRequest<any>): Observable<HttpEvent<any>> {\n    // Quick check to give a better error message when a user attempts to use\n    // HttpClient.jsonp() without installing the HttpClientJsonpModule\n    if (req.method === 'JSONP') {\n      throw new Error(\n          `Attempted to construct Jsonp request without HttpClientJsonpModule installed.`);\n    }\n\n    // Everything happens on Observable subscription.\n    return new Observable((observer: Observer<HttpEvent<any>>) => {\n      // Start by setting up the XHR object with request method, URL, and withCredentials flag.\n      const xhr = this.xhrFactory.build();\n      xhr.open(req.method, req.urlWithParams);\n      if (!!req.withCredentials) {\n        xhr.withCredentials = true;\n      }\n\n      // Add all the requested headers.\n      req.headers.forEach((name, values) => xhr.setRequestHeader(name, values.join(',')));\n\n      // Add an Accept header if one isn't present already.\n      if (!req.headers.has('Accept')) {\n        xhr.setRequestHeader('Accept', 'application/json, text/plain, */*');\n      }\n\n      // Auto-detect the Content-Type header if one isn't present already.\n      if (!req.headers.has('Content-Type')) {\n        const detectedType = req.detectContentTypeHeader();\n        // Sometimes Content-Type detection fails.\n        if (detectedType !== null) {\n          xhr.setRequestHeader('Content-Type', detectedType);\n        }\n      }\n\n      // Set the responseType if one was requested.\n      if (req.responseType) {\n        const responseType = req.responseType.toLowerCase();\n\n        // JSON responses need to be processed as text. This is because if the server\n        // returns an XSSI-prefixed JSON response, the browser will fail to parse it,\n        // xhr.response will be null, and xhr.responseText cannot be accessed to\n        // retrieve the prefixed JSON data in order to strip the prefix. Thus, all JSON\n        // is parsed by first requesting text and then applying JSON.parse.\n        xhr.responseType = ((responseType !== 'json') ? responseType : 'text') as any;\n      }\n\n      // Serialize the request body if one is present. If not, this will be set to null.\n      const reqBody = req.serializeBody();\n\n      // If progress events are enabled, response headers will be delivered\n      // in two events - the HttpHeaderResponse event and the full HttpResponse\n      // event. However, since response headers don't change in between these\n      // two events, it doesn't make sense to parse them twice. 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Otherwise, deliver the parsing error to the user.\n            if (ok) {\n              // Even though the response status was 2xx, this is still an error.\n              ok = false;\n              // The parse error contains the text of the body that failed to parse.\n              body = {error, text: body} as HttpJsonParseError;\n            }\n          }\n        }\n\n        if (ok) {\n          // A successful response is delivered on the event stream.\n          observer.next(new HttpResponse({\n            body,\n            headers,\n            status,\n            statusText,\n            url: url || undefined,\n          }));\n          // The full body has been received and delivered, no further events\n          // are possible. This request is complete.\n          observer.complete();\n        } else {\n          // An unsuccessful request is delivered on the error channel.\n          observer.error(new HttpErrorResponse({\n            // The error in this case is the response body (error from the server).\n            error: body,\n            headers,\n            status,\n            statusText,\n            url: url || undefined,\n          }));\n        }\n      };\n\n      // The onError callback is called when something goes wrong at the network level.\n      // Connection timeout, DNS error, offline, etc. These are actual errors, and are\n      // transmitted on the error channel.\n      const onError = (error: ProgressEvent) => {\n        const {url} = partialFromXhr();\n        const res = new HttpErrorResponse({\n          error,\n          status: xhr.status || 0,\n          statusText: xhr.statusText || 'Unknown Error',\n          url: url || undefined,\n        });\n        observer.error(res);\n      };\n\n      // The sentHeaders flag tracks whether the HttpResponseHeaders event\n      // has been sent on the stream. This is necessary to track if progress\n      // is enabled since the event will be sent on only the first download\n      // progerss event.\n      let sentHeaders = false;\n\n      // The download progress event handler, which is only registered if\n      // progress events are enabled.\n      const onDownProgress = (event: ProgressEvent) => {\n        // Send the HttpResponseHeaders event if it hasn't been sent already.\n        if (!sentHeaders) {\n          observer.next(partialFromXhr());\n          sentHeaders = true;\n        }\n\n        // Start building the download progress event to deliver on the response\n        // event stream.\n        let progressEvent: HttpDownloadProgressEvent = {\n          type: HttpEventType.DownloadProgress,\n          loaded: event.loaded,\n        };\n\n        // Set the total number of bytes in the event if it's available.\n        if (event.lengthComputable) {\n          progressEvent.total = event.total;\n        }\n\n        // If the request was for text content and a partial response is\n        // available on XMLHttpRequest, include it in the progress event\n        // to allow for streaming reads.\n        if (req.responseType === 'text' && !!xhr.responseText) {\n          progressEvent.partialText = xhr.responseText;\n        }\n\n        // Finally, fire the event.\n        observer.next(progressEvent);\n      };\n\n      // The upload progress event handler, which is only registered if\n      // progress events are enabled.\n      const onUpProgress = (event: ProgressEvent) => {\n        // Upload progress events are simpler. Begin building the progress\n        // event.\n        let progress: HttpUploadProgressEvent = {\n          type: HttpEventType.UploadProgress,\n          loaded: event.loaded,\n        };\n\n        // If the total number of bytes being uploaded is available, include\n        // it.\n        if (event.lengthComputable) {\n          progress.total = event.total;\n        }\n\n        // Send the event.\n        observer.next(progress);\n      };\n\n      // By default, register for load and error events.\n      xhr.addEventListener('load', onLoad);\n      xhr.addEventListener('error', onError);\n      xhr.addEventListener('timeout', onError);\n      xhr.addEventListener('abort', onError);\n\n      // Progress events are only enabled if requested.\n      if (req.reportProgress) {\n        // Download progress is always enabled if requested.\n        xhr.addEventListener('progress', onDownProgress);\n\n        // Upload progress depends on whether there is a body to upload.\n        if (reqBody !== null && xhr.upload) {\n          xhr.upload.addEventListener('progress', onUpProgress);\n        }\n      }\n\n      // Fire the request, and notify the event stream that it was fired.\n      xhr.send(reqBody!);\n      observer.next({type: HttpEventType.Sent});\n\n      // This is the return from the Observable function, which is the\n      // request cancellation handler.\n      return () => {\n        // On a cancellation, remove all registered event listeners.\n        xhr.removeEventListener('error', onError);\n        xhr.removeEventListener('abort', onError);\n        xhr.removeEventListener('load', onLoad);\n        xhr.removeEventListener('timeout', onError);\n        if (req.reportProgress) {\n          xhr.removeEventListener('progress', onDownProgress);\n          if (reqBody !== null && xhr.upload) {\n            xhr.upload.removeEventListener('progress', onUpProgress);\n          }\n        }\n\n        // Finally, abort the in-flight request.\n        if (xhr.readyState !== xhr.DONE) {\n          xhr.abort();\n        }\n      };\n    });\n  }\n}\n"]}