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Copyright (c) Microsoft Corporation.\n// Licensed under the MIT license.\n\nimport {\n  FullOperationResponse,\n  OperationRequest,\n  OperationResponseMap,\n  OperationSpec,\n  RequiredSerializerOptions,\n  SerializerOptions,\n  XML_CHARKEY,\n  XmlOptions,\n} from \"./interfaces.js\";\nimport {\n  PipelinePolicy,\n  PipelineRequest,\n  PipelineResponse,\n  RestError,\n  SendRequest,\n} from \"@azure/core-rest-pipeline\";\nimport { MapperTypeNames } from \"./serializer.js\";\nimport { getOperationRequestInfo } from \"./operationHelpers.js\";\n\nconst defaultJsonContentTypes = [\"application/json\", \"text/json\"];\nconst defaultXmlContentTypes = [\"application/xml\", \"application/atom+xml\"];\n\n/**\n * The programmatic identifier of the deserializationPolicy.\n */\nexport const deserializationPolicyName = \"deserializationPolicy\";\n\n/**\n * Options to configure API response deserialization.\n */\nexport interface DeserializationPolicyOptions {\n  /**\n   * Configures the expected content types for the deserialization of\n   * JSON and XML response bodies.\n   */\n  expectedContentTypes?: DeserializationContentTypes;\n\n  /**\n   * A function that is able to parse XML. Required for XML support.\n   */\n  parseXML?: (str: string, opts?: XmlOptions) => Promise<any>;\n\n  /**\n   * Configures behavior of xml parser and builder.\n   */\n  serializerOptions?: SerializerOptions;\n}\n\n/**\n * The content-types that will indicate that an operation response should be deserialized in a\n * particular way.\n */\nexport interface DeserializationContentTypes {\n  /**\n   * The content-types that indicate that an operation response should be deserialized as JSON.\n   * Defaults to [ \"application/json\", \"text/json\" ].\n   */\n  json?: string[];\n\n  /**\n   * The content-types that indicate that an operation response should be deserialized as XML.\n   * Defaults to [ \"application/xml\", \"application/atom+xml\" ].\n   */\n  xml?: string[];\n}\n\n/**\n * This policy handles parsing out responses according to OperationSpecs on the request.\n */\nexport function deserializationPolicy(options: DeserializationPolicyOptions = {}): PipelinePolicy {\n  const jsonContentTypes = options.expectedContentTypes?.json ?? defaultJsonContentTypes;\n  const xmlContentTypes = options.expectedContentTypes?.xml ?? defaultXmlContentTypes;\n  const parseXML = options.parseXML;\n  const serializerOptions = options.serializerOptions;\n  const updatedOptions: RequiredSerializerOptions = {\n    xml: {\n      rootName: serializerOptions?.xml.rootName ?? \"\",\n      includeRoot: serializerOptions?.xml.includeRoot ?? false,\n      xmlCharKey: serializerOptions?.xml.xmlCharKey ?? XML_CHARKEY,\n    },\n  };\n\n  return {\n    name: deserializationPolicyName,\n    async sendRequest(request: PipelineRequest, next: SendRequest): Promise<PipelineResponse> {\n      const response = await next(request);\n      return deserializeResponseBody(\n        jsonContentTypes,\n        xmlContentTypes,\n        response,\n        updatedOptions,\n        parseXML,\n      );\n    },\n  };\n}\n\nfunction getOperationResponseMap(\n  parsedResponse: PipelineResponse,\n): undefined | OperationResponseMap {\n  let result: OperationResponseMap | undefined;\n  const request: OperationRequest = parsedResponse.request;\n  const operationInfo = getOperationRequestInfo(request);\n  const operationSpec = operationInfo?.operationSpec;\n  if (operationSpec) {\n    if (!operationInfo?.operationResponseGetter) {\n      result = operationSpec.responses[parsedResponse.status];\n    } else {\n      result = operationInfo?.operationResponseGetter(operationSpec, parsedResponse);\n    }\n  }\n  return result;\n}\n\nfunction shouldDeserializeResponse(parsedResponse: PipelineResponse): boolean {\n  const request: OperationRequest = parsedResponse.request;\n  const operationInfo = getOperationRequestInfo(request);\n  const shouldDeserialize = operationInfo?.shouldDeserialize;\n  let result: boolean;\n  if (shouldDeserialize === undefined) {\n    result = true;\n  } else if (typeof shouldDeserialize === \"boolean\") {\n    result = shouldDeserialize;\n  } else {\n    result = shouldDeserialize(parsedResponse);\n  }\n  return result;\n}\n\nasync function deserializeResponseBody(\n  jsonContentTypes: string[],\n  xmlContentTypes: string[],\n  response: PipelineResponse,\n  options: RequiredSerializerOptions,\n  parseXML?: (str: string, opts?: XmlOptions) => Promise<any>,\n): Promise<PipelineResponse> {\n  const parsedResponse = await parse(\n    jsonContentTypes,\n    xmlContentTypes,\n    response,\n    options,\n    parseXML,\n  );\n  if (!shouldDeserializeResponse(parsedResponse)) {\n    return parsedResponse;\n  }\n\n  const operationInfo = getOperationRequestInfo(parsedResponse.request);\n  const operationSpec = operationInfo?.operationSpec;\n  if (!operationSpec || !operationSpec.responses) {\n    return parsedResponse;\n  }\n\n  const responseSpec = getOperationResponseMap(parsedResponse);\n  const { error, shouldReturnResponse } = handleErrorResponse(\n    parsedResponse,\n    operationSpec,\n    responseSpec,\n    options,\n  );\n  if (error) {\n    throw error;\n  } else if (shouldReturnResponse) {\n    return parsedResponse;\n  }\n\n  // An operation response spec does exist for current status code, so\n  // use it to deserialize the response.\n  if (responseSpec) {\n    if (responseSpec.bodyMapper) {\n      let valueToDeserialize: any = parsedResponse.parsedBody;\n      if (operationSpec.isXML && responseSpec.bodyMapper.type.name === MapperTypeNames.Sequence) {\n        valueToDeserialize =\n          typeof valueToDeserialize === \"object\"\n            ? valueToDeserialize[responseSpec.bodyMapper.xmlElementName!]\n            : [];\n      }\n      try {\n        parsedResponse.parsedBody = operationSpec.serializer.deserialize(\n          responseSpec.bodyMapper,\n          valueToDeserialize,\n          \"operationRes.parsedBody\",\n          options,\n        );\n      } catch (deserializeError: any) {\n        const restError = new RestError(\n          `Error ${deserializeError} occurred in deserializing the responseBody - ${parsedResponse.bodyAsText}`,\n          {\n            statusCode: parsedResponse.status,\n            request: parsedResponse.request,\n            response: parsedResponse,\n          },\n        );\n        throw restError;\n      }\n    } else if (operationSpec.httpMethod === \"HEAD\") {\n      // head methods never have a body, but we return a boolean to indicate presence/absence of the resource\n      parsedResponse.parsedBody = response.status >= 200 && response.status < 300;\n    }\n\n    if (responseSpec.headersMapper) {\n      parsedResponse.parsedHeaders = operationSpec.serializer.deserialize(\n        responseSpec.headersMapper,\n        parsedResponse.headers.toJSON(),\n        \"operationRes.parsedHeaders\",\n        { xml: {}, ignoreUnknownProperties: true },\n      );\n    }\n  }\n\n  return parsedResponse;\n}\n\nfunction isOperationSpecEmpty(operationSpec: OperationSpec): boolean {\n  const expectedStatusCodes = Object.keys(operationSpec.responses);\n  return (\n    expectedStatusCodes.length === 0 ||\n    (expectedStatusCodes.length === 1 && expectedStatusCodes[0] === \"default\")\n  );\n}\n\nfunction handleErrorResponse(\n  parsedResponse: FullOperationResponse,\n  operationSpec: OperationSpec,\n  responseSpec: OperationResponseMap | undefined,\n  options: RequiredSerializerOptions,\n): { error: RestError | null; shouldReturnResponse: boolean } {\n  const isSuccessByStatus = 200 <= parsedResponse.status && parsedResponse.status < 300;\n  const isExpectedStatusCode: boolean = isOperationSpecEmpty(operationSpec)\n    ? isSuccessByStatus\n    : !!responseSpec;\n\n  if (isExpectedStatusCode) {\n    if (responseSpec) {\n      if (!responseSpec.isError) {\n        return { error: null, shouldReturnResponse: false };\n      }\n    } else {\n      return { error: null, shouldReturnResponse: false };\n    }\n  }\n\n  const errorResponseSpec = responseSpec ?? operationSpec.responses.default;\n\n  const initialErrorMessage = parsedResponse.request.streamResponseStatusCodes?.has(\n    parsedResponse.status,\n  )\n    ? `Unexpected status code: ${parsedResponse.status}`\n    : (parsedResponse.bodyAsText as string);\n\n  const error = new RestError(initialErrorMessage, {\n    statusCode: parsedResponse.status,\n    request: parsedResponse.request,\n    response: parsedResponse,\n  });\n\n  // If the item failed but there's no error spec or default spec to deserialize the error,\n  // we should fail so we just throw the parsed response\n  if (!errorResponseSpec) {\n    throw error;\n  }\n\n  const defaultBodyMapper = errorResponseSpec.bodyMapper;\n  const defaultHeadersMapper = errorResponseSpec.headersMapper;\n\n  try {\n    // If error response has a body, try to deserialize it using default body mapper.\n    // Then try to extract error code & message from it\n    if (parsedResponse.parsedBody) {\n      const parsedBody = parsedResponse.parsedBody;\n      let deserializedError;\n\n      if (defaultBodyMapper) {\n        let valueToDeserialize: any = parsedBody;\n        if (operationSpec.isXML && defaultBodyMapper.type.name === MapperTypeNames.Sequence) {\n          valueToDeserialize = [];\n          const elementName = defaultBodyMapper.xmlElementName;\n          if (typeof parsedBody === \"object\" && elementName) {\n            valueToDeserialize = parsedBody[elementName];\n          }\n        }\n        deserializedError = operationSpec.serializer.deserialize(\n          defaultBodyMapper,\n          valueToDeserialize,\n          \"error.response.parsedBody\",\n          options,\n        );\n      }\n\n      const internalError: any = parsedBody.error || deserializedError || parsedBody;\n      error.code = internalError.code;\n      if (internalError.message) {\n        error.message = internalError.message;\n      }\n\n      if (defaultBodyMapper) {\n        (error.response! as FullOperationResponse).parsedBody = deserializedError;\n      }\n    }\n\n    // If error response has headers, try to deserialize it using default header mapper\n    if (parsedResponse.headers && defaultHeadersMapper) {\n      (error.response! as FullOperationResponse).parsedHeaders =\n        operationSpec.serializer.deserialize(\n          defaultHeadersMapper,\n          parsedResponse.headers.toJSON(),\n          \"operationRes.parsedHeaders\",\n        );\n    }\n  } catch (defaultError: any) {\n    error.message = `Error \"${defaultError.message}\" occurred in deserializing the responseBody - \"${parsedResponse.bodyAsText}\" for the default response.`;\n  }\n\n  return { error, shouldReturnResponse: false };\n}\n\nasync function parse(\n  jsonContentTypes: string[],\n  xmlContentTypes: string[],\n  operationResponse: FullOperationResponse,\n  opts: RequiredSerializerOptions,\n  parseXML?: (str: string, opts?: XmlOptions) => Promise<any>,\n): Promise<FullOperationResponse> {\n  if (\n    !operationResponse.request.streamResponseStatusCodes?.has(operationResponse.status) &&\n    operationResponse.bodyAsText\n  ) {\n    const text = operationResponse.bodyAsText;\n    const contentType: string = operationResponse.headers.get(\"Content-Type\") || \"\";\n    const contentComponents: string[] = !contentType\n      ? []\n      : contentType.split(\";\").map((component) => component.toLowerCase());\n\n    try {\n      if (\n        contentComponents.length === 0 ||\n        contentComponents.some((component) => jsonContentTypes.indexOf(component) !== -1)\n      ) {\n        operationResponse.parsedBody = JSON.parse(text);\n        return operationResponse;\n      } else if (contentComponents.some((component) => xmlContentTypes.indexOf(component) !== -1)) {\n        if (!parseXML) {\n          throw new Error(\"Parsing XML not supported.\");\n        }\n        const body = await parseXML(text, opts.xml);\n        operationResponse.parsedBody = body;\n        return operationResponse;\n      }\n    } catch (err: any) {\n      const msg = `Error \"${err}\" occurred while parsing the response body - ${operationResponse.bodyAsText}.`;\n      const errCode = err.code || RestError.PARSE_ERROR;\n      const e = new RestError(msg, {\n        code: errCode,\n        statusCode: operationResponse.status,\n        request: operationResponse.request,\n        response: operationResponse,\n      });\n      throw e;\n    }\n  }\n\n  return operationResponse;\n}\n"]}