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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 // and the parsed body doesn't look like an error object,\n // we should fail so we just throw the parsed response\n if (\n !errorResponseSpec &&\n !(parsedResponse.parsedBody?.error?.code && parsedResponse.parsedBody?.error?.message)\n ) {\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"]}
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