/** * @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 { XhrFactory } from '@angular/common'; 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; } /** * 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 /* NoContent */ : 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 /* NoContent */) { // 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 /* Ok */ : 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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* @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 {XhrFactory} from '@angular/common';\nimport {Injectable} from '@angular/core';\nimport {Observable, Observer} from 'rxjs';\n\nimport {HttpBackend} from './backend';\nimport {HttpHeaders} from './headers';\nimport {HttpRequest} from './request';\nimport {HttpDownloadProgressEvent, HttpErrorResponse, HttpEvent, HttpEventType, HttpHeaderResponse, HttpJsonParseError, HttpResponse, HttpStatusCode, HttpUploadProgressEvent} from './response';\n\n\nconst XSSI_PREFIX = /^\\)\\]\\}',?\\n/;\n\n/**\n * Determine an appropriate URL for the response, by checking either\n * XMLHttpRequest.responseURL or the X-Request-URL header.\n */\nfunction getResponseUrl(xhr: any): string|null {\n  if ('responseURL' in xhr && xhr.responseURL) {\n    return xhr.responseURL;\n  }\n  if (/^X-Request-URL:/m.test(xhr.getAllResponseHeaders())) {\n    return xhr.getResponseHeader('X-Request-URL');\n  }\n  return null;\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. So headerResponse\n      // caches the data extracted from the response whenever it's first parsed,\n      // to ensure parsing isn't duplicated.\n      let headerResponse: HttpHeaderResponse|null = null;\n\n      // partialFromXhr extracts the HttpHeaderResponse from the current XMLHttpRequest\n      // state, and memoizes it into headerResponse.\n      const partialFromXhr = (): HttpHeaderResponse => {\n        if (headerResponse !== null) {\n          return headerResponse;\n        }\n\n        // Read status and normalize an IE9 bug (https://bugs.jquery.com/ticket/1450).\n        const status: number = xhr.status === 1223 ? HttpStatusCode.NoContent : xhr.status;\n        const statusText = xhr.statusText || 'OK';\n\n        // Parse headers from XMLHttpRequest - this step is lazy.\n        const headers = new HttpHeaders(xhr.getAllResponseHeaders());\n\n        // Read the response URL from the XMLHttpResponse instance and fall back on the\n        // request URL.\n        const url = getResponseUrl(xhr) || req.url;\n\n        // Construct the HttpHeaderResponse and memoize it.\n        headerResponse = new HttpHeaderResponse({headers, status, statusText, url});\n        return headerResponse;\n      };\n\n      // Next, a few closures are defined for the various events which XMLHttpRequest can\n      // emit. This allows them to be unregistered as event listeners later.\n\n      // First up is the load event, which represents a response being fully available.\n      const onLoad = () => {\n        // Read response state from the memoized partial data.\n        let {headers, status, statusText, url} = partialFromXhr();\n\n        // The body will be read out if present.\n        let body: any|null = null;\n\n        if (status !== HttpStatusCode.NoContent) {\n          // Use XMLHttpRequest.response if set, responseText otherwise.\n          body = (typeof xhr.response === 'undefined') ? xhr.responseText : xhr.response;\n        }\n\n        // Normalize another potential bug (this one comes from CORS).\n        if (status === 0) {\n          status = !!body ? HttpStatusCode.Ok : 0;\n        }\n\n        // ok determines whether the response will be transmitted on the event or\n        // error channel. Unsuccessful status codes (not 2xx) will always be errors,\n        // but a successful status code can still result in an error if the user\n        // asked for JSON data and the body cannot be parsed as such.\n        let ok = status >= 200 && status < 300;\n\n        // Check whether the body needs to be parsed as JSON (in many cases the browser\n        // will have done that already).\n        if (req.responseType === 'json' && typeof body === 'string') {\n          // Save the original body, before attempting XSSI prefix stripping.\n          const originalBody = body;\n          body = body.replace(XSSI_PREFIX, '');\n          try {\n            // Attempt the parse. If it fails, a parse error should be delivered to the user.\n            body = body !== '' ? JSON.parse(body) : null;\n          } catch (error) {\n            // Since the JSON.parse failed, it's reasonable to assume this might not have been a\n            // JSON response. Restore the original body (including any XSSI prefix) to deliver\n            // a better error response.\n            body = originalBody;\n\n            // If this was an error request to begin with, leave it as a string, it probably\n            // just isn't JSON. 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"]}