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Copyright (c) Microsoft Corporation.\n// Licensed under the MIT license.\n\nimport { AbortError } from \"@azure/abort-controller\";\nimport type {\n  HttpClient,\n  HttpHeaders,\n  PipelineRequest,\n  PipelineResponse,\n  TransferProgressEvent,\n} from \"./interfaces.js\";\nimport { createHttpHeaders } from \"./httpHeaders.js\";\nimport { RestError } from \"./restError.js\";\nimport { isReadableStream } from \"./util/typeGuards.js\";\n\n/**\n * A HttpClient implementation that uses XMLHttpRequest to send HTTP requests.\n * @internal\n */\nclass XhrHttpClient implements HttpClient {\n  /**\n   * Makes a request over an underlying transport layer and returns the response.\n   * @param request - The request to be made.\n   */\n  public async sendRequest(request: PipelineRequest): Promise<PipelineResponse> {\n    const url = new URL(request.url);\n    const isInsecure = url.protocol !== \"https:\";\n\n    if (isInsecure && !request.allowInsecureConnection) {\n      throw new Error(`Cannot connect to ${request.url} while allowInsecureConnection is false.`);\n    }\n\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        throw 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    xhr.open(request.method, request.url);\n    xhr.timeout = request.timeout;\n    xhr.withCredentials = request.withCredentials;\n    for (const [name, value] of request.headers) {\n      xhr.setRequestHeader(name, value);\n    }\n\n    xhr.responseType = request.streamResponseStatusCodes?.size ? \"blob\" : \"text\";\n\n    const body = typeof request.body === \"function\" ? request.body() : request.body;\n    if (isReadableStream(body)) {\n      throw new Error(\"streams are not supported in XhrHttpClient.\");\n    }\n\n    xhr.send(body === undefined ? null : 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: PipelineRequest,\n  res: (value: PipelineResponse | PromiseLike<PipelineResponse>) => 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 (\n        // Value of POSITIVE_INFINITY in streamResponseStatusCodes is considered as any status code\n        request.streamResponseStatusCodes?.has(Number.POSITIVE_INFINITY) ||\n        request.streamResponseStatusCodes?.has(xhr.status)\n      ) {\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            xhr.response\n              .text()\n              .then((text: string) => {\n                res({\n                  request: request,\n                  status: xhr.status,\n                  headers: parseHeaders(xhr),\n                  bodyAsText: text,\n                });\n                return;\n              })\n              .catch((e: any) => {\n                rej(e);\n              });\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\nfunction parseHeaders(xhr: XMLHttpRequest): HttpHeaders {\n  const responseHeaders = createHttpHeaders();\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: PipelineRequest,\n  xhr: XMLHttpRequest,\n  reject: (err: any) => void,\n): void {\n  xhr.addEventListener(\"error\", () =>\n    reject(\n      new RestError(`Failed to send request to ${request.url}`, {\n        code: RestError.REQUEST_SEND_ERROR,\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\n/**\n * Create a new HttpClient instance for the browser environment.\n * @internal\n */\nexport function createXhrHttpClient(): HttpClient {\n  return new XhrHttpClient();\n}\n"]}