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Copyright (c) Microsoft Corporation.\n// Licensed under the MIT license.\n\nimport { HttpHeaders, HttpHeadersLike } from \"./httpHeaders\";\nimport { TransferProgressEvent, WebResourceLike } from \"./webResource\";\nimport { AbortError } from \"@azure/abort-controller\";\nimport { HttpClient } from \"./httpClient\";\nimport { HttpOperationResponse } from \"./httpOperationResponse\";\nimport { RestError } from \"./restError\";\n\n/**\n * A HttpClient implementation that uses XMLHttpRequest to send HTTP requests.\n */\nexport class XhrHttpClient implements HttpClient {\n public sendRequest(request: WebResourceLike): Promise<HttpOperationResponse> {\n const xhr = new XMLHttpRequest();\n\n if (request.proxySettings) {\n throw new Error(\"HTTP proxy is not supported in browser environment\");\n }\n\n const abortSignal = request.abortSignal;\n if (abortSignal) {\n if (abortSignal.aborted) {\n return Promise.reject(new AbortError(\"The operation was aborted.\"));\n }\n\n const listener = (): void => {\n xhr.abort();\n };\n abortSignal.addEventListener(\"abort\", listener);\n xhr.addEventListener(\"readystatechange\", () => {\n if (xhr.readyState === XMLHttpRequest.DONE) {\n abortSignal.removeEventListener(\"abort\", listener);\n }\n });\n }\n\n addProgressListener(xhr.upload, request.onUploadProgress);\n addProgressListener(xhr, request.onDownloadProgress);\n\n if (request.formData) {\n const formData = request.formData;\n const requestForm = new FormData();\n const appendFormValue = (key: string, value: any): void => {\n if (\n value &&\n Object.prototype.hasOwnProperty.call(value, \"value\") &&\n Object.prototype.hasOwnProperty.call(value, \"options\")\n ) {\n requestForm.append(key, value.value, value.options);\n } else {\n requestForm.append(key, value);\n }\n };\n for (const formKey of Object.keys(formData)) {\n const formValue = formData[formKey];\n if (Array.isArray(formValue)) {\n for (let j = 0; j < formValue.length; j++) {\n appendFormValue(formKey, formValue[j]);\n }\n } else {\n appendFormValue(formKey, formValue);\n }\n }\n\n request.body = requestForm;\n request.formData = undefined;\n const contentType = request.headers.get(\"Content-Type\");\n if (contentType && contentType.indexOf(\"multipart/form-data\") !== -1) {\n // browser will automatically apply a suitable content-type header\n request.headers.remove(\"Content-Type\");\n }\n }\n\n xhr.open(request.method, request.url);\n xhr.timeout = request.timeout;\n xhr.withCredentials = request.withCredentials;\n for (const header of request.headers.headersArray()) {\n xhr.setRequestHeader(header.name, header.value);\n }\n\n xhr.responseType =\n request.streamResponseStatusCodes?.size || request.streamResponseBody ? \"blob\" : \"text\";\n\n // tslint:disable-next-line:no-null-keyword\n xhr.send(request.body === undefined ? null : request.body);\n\n if (xhr.responseType === \"blob\") {\n return new Promise((resolve, reject) => {\n handleBlobResponse(xhr, request, resolve, reject);\n rejectOnTerminalEvent(request, xhr, reject);\n });\n } else {\n return new Promise(function (resolve, reject) {\n xhr.addEventListener(\"load\", () =>\n resolve({\n request,\n status: xhr.status,\n headers: parseHeaders(xhr),\n bodyAsText: xhr.responseText,\n })\n );\n rejectOnTerminalEvent(request, xhr, reject);\n });\n }\n }\n}\n\nfunction handleBlobResponse(\n xhr: XMLHttpRequest,\n request: WebResourceLike,\n res: (value: HttpOperationResponse | PromiseLike<HttpOperationResponse>) => void,\n rej: (reason?: any) => void\n): void {\n xhr.addEventListener(\"readystatechange\", () => {\n // Resolve as soon as headers are loaded\n if (xhr.readyState === XMLHttpRequest.HEADERS_RECEIVED) {\n if (request.streamResponseBody || request.streamResponseStatusCodes?.has(xhr.status)) {\n const blobBody = new Promise<Blob>((resolve, reject) => {\n xhr.addEventListener(\"load\", () => {\n resolve(xhr.response);\n });\n rejectOnTerminalEvent(request, xhr, reject);\n });\n res({\n request,\n status: xhr.status,\n headers: parseHeaders(xhr),\n blobBody,\n });\n } else {\n xhr.addEventListener(\"load\", () => {\n // xhr.response is of Blob type if the request is sent with xhr.responseType === \"blob\"\n // but the status code is not one of the stream response status codes,\n // so treat it as text and convert from Blob to text\n if (xhr.response) {\n // Blob.text() is not supported in IE so using FileReader instead\n const reader = new FileReader();\n reader.onload = function (e) {\n const text = e.target?.result as string;\n res({\n request,\n status: xhr.status,\n headers: parseHeaders(xhr),\n bodyAsText: text,\n });\n };\n reader.onerror = function (_e) {\n rej(reader.error);\n };\n reader.readAsText(xhr.response, \"UTF-8\");\n } else {\n res({\n request,\n status: xhr.status,\n headers: parseHeaders(xhr),\n });\n }\n });\n }\n }\n });\n}\n\nfunction addProgressListener(\n xhr: XMLHttpRequestEventTarget,\n listener?: (progress: TransferProgressEvent) => void\n): void {\n if (listener) {\n xhr.addEventListener(\"progress\", (rawEvent) =>\n listener({\n loadedBytes: rawEvent.loaded,\n })\n );\n }\n}\n\n// exported locally for testing\nexport function parseHeaders(xhr: XMLHttpRequest): HttpHeadersLike {\n const responseHeaders = new HttpHeaders();\n const headerLines = xhr\n .getAllResponseHeaders()\n .trim()\n .split(/[\\r\\n]+/);\n for (const line of headerLines) {\n const index = line.indexOf(\":\");\n const headerName = line.slice(0, index);\n const headerValue = line.slice(index + 2);\n responseHeaders.set(headerName, headerValue);\n }\n return responseHeaders;\n}\n\nfunction rejectOnTerminalEvent(\n request: WebResourceLike,\n xhr: XMLHttpRequest,\n reject: (err: any) => void\n): void {\n xhr.addEventListener(\"error\", () =>\n reject(\n new RestError(\n `Failed to send request to ${request.url}`,\n RestError.REQUEST_SEND_ERROR,\n undefined,\n request\n )\n )\n );\n const abortError = new AbortError(\"The operation was aborted.\");\n xhr.addEventListener(\"abort\", () => reject(abortError));\n xhr.addEventListener(\"timeout\", () => reject(abortError));\n}\n"]}