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* Copyright The OpenTelemetry Authors\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * https://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\nimport {\n MetricAttributes,\n SpanAttributes,\n SpanStatusCode,\n Span,\n context,\n SpanKind,\n} from '@opentelemetry/api';\nimport {\n NETTRANSPORTVALUES_IP_TCP,\n NETTRANSPORTVALUES_IP_UDP,\n SEMATTRS_HTTP_CLIENT_IP,\n SEMATTRS_HTTP_FLAVOR,\n SEMATTRS_HTTP_HOST,\n SEMATTRS_HTTP_METHOD,\n SEMATTRS_HTTP_REQUEST_CONTENT_LENGTH,\n SEMATTRS_HTTP_REQUEST_CONTENT_LENGTH_UNCOMPRESSED,\n SEMATTRS_HTTP_RESPONSE_CONTENT_LENGTH,\n SEMATTRS_HTTP_RESPONSE_CONTENT_LENGTH_UNCOMPRESSED,\n SEMATTRS_HTTP_ROUTE,\n SEMATTRS_HTTP_SCHEME,\n SEMATTRS_HTTP_SERVER_NAME,\n SEMATTRS_HTTP_STATUS_CODE,\n SEMATTRS_HTTP_TARGET,\n SEMATTRS_HTTP_URL,\n SEMATTRS_HTTP_USER_AGENT,\n SEMATTRS_NET_HOST_IP,\n SEMATTRS_NET_HOST_NAME,\n SEMATTRS_NET_HOST_PORT,\n SEMATTRS_NET_PEER_IP,\n SEMATTRS_NET_PEER_NAME,\n SEMATTRS_NET_PEER_PORT,\n SEMATTRS_NET_TRANSPORT,\n} from '@opentelemetry/semantic-conventions';\nimport {\n IncomingHttpHeaders,\n IncomingMessage,\n OutgoingHttpHeaders,\n RequestOptions,\n ServerResponse,\n} from 'http';\nimport { getRPCMetadata, RPCType } from '@opentelemetry/core';\nimport * as url from 'url';\nimport { AttributeNames } from './enums/AttributeNames';\nimport { Err, IgnoreMatcher, ParsedRequestOptions } from './types';\n\n/**\n * Get an absolute url\n */\nexport const getAbsoluteUrl = (\n requestUrl: ParsedRequestOptions | null,\n headers: IncomingHttpHeaders | OutgoingHttpHeaders,\n fallbackProtocol = 'http:'\n): string => {\n const reqUrlObject = requestUrl || {};\n const protocol = reqUrlObject.protocol || fallbackProtocol;\n const port = (reqUrlObject.port || '').toString();\n const path = reqUrlObject.path || '/';\n let host =\n reqUrlObject.host || reqUrlObject.hostname || headers.host || 'localhost';\n\n // if there is no port in host and there is a port\n // it should be displayed if it's not 80 and 443 (default ports)\n if (\n (host as string).indexOf(':') === -1 &&\n port &&\n port !== '80' &&\n port !== '443'\n ) {\n host += `:${port}`;\n }\n\n return `${protocol}//${host}${path}`;\n};\n\n/**\n * Parse status code from HTTP response. [More details](https://github.com/open-telemetry/opentelemetry-specification/blob/master/specification/data-http.md#status)\n */\nexport const parseResponseStatus = (\n kind: SpanKind,\n statusCode?: number\n): SpanStatusCode => {\n const upperBound = kind === SpanKind.CLIENT ? 400 : 500;\n // 1xx, 2xx, 3xx are OK on client and server\n // 4xx is OK on server\n if (statusCode && statusCode >= 100 && statusCode < upperBound) {\n return SpanStatusCode.UNSET;\n }\n\n // All other codes are error\n return SpanStatusCode.ERROR;\n};\n\n/**\n * Check whether the given obj match pattern\n * @param constant e.g URL of request\n * @param pattern Match pattern\n */\nexport const satisfiesPattern = (\n constant: string,\n pattern: IgnoreMatcher\n): boolean => {\n if (typeof pattern === 'string') {\n return pattern === constant;\n } else if (pattern instanceof RegExp) {\n return pattern.test(constant);\n } else if (typeof pattern === 'function') {\n return pattern(constant);\n } else {\n throw new TypeError('Pattern is in unsupported datatype');\n }\n};\n\n/**\n * Check whether the given request is ignored by configuration\n * It will not re-throw exceptions from `list` provided by the client\n * @param constant e.g URL of request\n * @param [list] List of ignore patterns\n * @param [onException] callback for doing something when an exception has\n * occurred\n */\nexport const isIgnored = (\n constant: string,\n list?: IgnoreMatcher[],\n onException?: (error: unknown) => void\n): boolean => {\n if (!list) {\n // No ignored urls - trace everything\n return false;\n }\n // Try/catch outside the loop for failing fast\n try {\n for (const pattern of list) {\n if (satisfiesPattern(constant, pattern)) {\n return true;\n }\n }\n } catch (e) {\n if (onException) {\n onException(e);\n }\n }\n\n return false;\n};\n\n/**\n * Sets the span with the error passed in params\n * @param {Span} span the span that need to be set\n * @param {Error} error error that will be set to span\n */\nexport const setSpanWithError = (span: Span, error: Err): void => {\n const message = error.message;\n\n span.setAttribute(AttributeNames.HTTP_ERROR_NAME, error.name);\n span.setAttribute(AttributeNames.HTTP_ERROR_MESSAGE, message);\n span.setStatus({ code: SpanStatusCode.ERROR, message });\n span.recordException(error);\n};\n\n/**\n * Adds attributes for request content-length and content-encoding HTTP headers\n * @param { IncomingMessage } Request object whose headers will be analyzed\n * @param { SpanAttributes } SpanAttributes object to be modified\n */\nexport const setRequestContentLengthAttribute = (\n request: IncomingMessage,\n attributes: SpanAttributes\n): void => {\n const length = getContentLength(request.headers);\n if (length === null) return;\n\n if (isCompressed(request.headers)) {\n attributes[SEMATTRS_HTTP_REQUEST_CONTENT_LENGTH] = length;\n } else {\n attributes[SEMATTRS_HTTP_REQUEST_CONTENT_LENGTH_UNCOMPRESSED] = length;\n }\n};\n\n/**\n * Adds attributes for response content-length and content-encoding HTTP headers\n * @param { IncomingMessage } Response object whose headers will be analyzed\n * @param { SpanAttributes } SpanAttributes object to be modified\n */\nexport const setResponseContentLengthAttribute = (\n response: IncomingMessage,\n attributes: SpanAttributes\n): void => {\n const length = getContentLength(response.headers);\n if (length === null) return;\n\n if (isCompressed(response.headers)) {\n attributes[SEMATTRS_HTTP_RESPONSE_CONTENT_LENGTH] = length;\n } else {\n attributes[SEMATTRS_HTTP_RESPONSE_CONTENT_LENGTH_UNCOMPRESSED] = length;\n }\n};\n\nfunction getContentLength(\n headers: OutgoingHttpHeaders | IncomingHttpHeaders\n): number | null {\n const contentLengthHeader = headers['content-length'];\n if (contentLengthHeader === undefined) return null;\n\n const contentLength = parseInt(contentLengthHeader as string, 10);\n if (isNaN(contentLength)) return null;\n\n return contentLength;\n}\n\nexport const isCompressed = (\n headers: OutgoingHttpHeaders | IncomingHttpHeaders\n): boolean => {\n const encoding = headers['content-encoding'];\n\n return !!encoding && encoding !== 'identity';\n};\n\n/**\n * Makes sure options is an url object\n * return an object with default value and parsed options\n * @param options original options for the request\n * @param [extraOptions] additional options for the request\n */\nexport const getRequestInfo = (\n options: url.URL | RequestOptions | string,\n extraOptions?: RequestOptions\n): {\n origin: string;\n pathname: string;\n method: string;\n optionsParsed: RequestOptions;\n} => {\n let pathname = '/';\n let origin = '';\n let optionsParsed: RequestOptions;\n if (typeof options === 'string') {\n optionsParsed = url.parse(options);\n pathname = (optionsParsed as url.UrlWithStringQuery).pathname || '/';\n origin = `${optionsParsed.protocol || 'http:'}//${optionsParsed.host}`;\n if (extraOptions !== undefined) {\n Object.assign(optionsParsed, extraOptions);\n }\n } else if (options instanceof url.URL) {\n optionsParsed = {\n protocol: options.protocol,\n hostname:\n typeof options.hostname === 'string' && options.hostname.startsWith('[')\n ? options.hostname.slice(1, -1)\n : options.hostname,\n path: `${options.pathname || ''}${options.search || ''}`,\n };\n if (options.port !== '') {\n optionsParsed.port = Number(options.port);\n }\n if (options.username || options.password) {\n optionsParsed.auth = `${options.username}:${options.password}`;\n }\n pathname = options.pathname;\n origin = options.origin;\n if (extraOptions !== undefined) {\n Object.assign(optionsParsed, extraOptions);\n }\n } else {\n optionsParsed = Object.assign(\n { protocol: options.host ? 'http:' : undefined },\n options\n );\n pathname = (options as url.URL).pathname;\n if (!pathname && optionsParsed.path) {\n pathname = url.parse(optionsParsed.path).pathname || '/';\n }\n const hostname =\n optionsParsed.host ||\n (optionsParsed.port != null\n ? `${optionsParsed.hostname}${optionsParsed.port}`\n : optionsParsed.hostname);\n origin = `${optionsParsed.protocol || 'http:'}//${hostname}`;\n }\n\n // some packages return method in lowercase..\n // ensure upperCase for consistency\n const method = optionsParsed.method\n ? optionsParsed.method.toUpperCase()\n : 'GET';\n\n return { origin, pathname, method, optionsParsed };\n};\n\n/**\n * Makes sure options is of type string or object\n * @param options for the request\n */\nexport const isValidOptionsType = (options: unknown): boolean => {\n if (!options) {\n return false;\n }\n\n const type = typeof options;\n return type === 'string' || (type === 'object' && !Array.isArray(options));\n};\n\nexport const extractHostnameAndPort = (\n requestOptions: Pick<\n ParsedRequestOptions,\n 'hostname' | 'host' | 'port' | 'protocol'\n >\n): { hostname: string; port: number | string } => {\n if (requestOptions.hostname && requestOptions.port) {\n return { hostname: requestOptions.hostname, port: requestOptions.port };\n }\n const matches = requestOptions.host?.match(/^([^:/ ]+)(:\\d{1,5})?/) || null;\n const hostname =\n requestOptions.hostname || (matches === null ? 'localhost' : matches[1]);\n let port = requestOptions.port;\n if (!port) {\n if (matches && matches[2]) {\n // remove the leading \":\". The extracted port would be something like \":8080\"\n port = matches[2].substring(1);\n } else {\n port = requestOptions.protocol === 'https:' ? '443' : '80';\n }\n }\n return { hostname, port };\n};\n\n/**\n * Returns outgoing request attributes scoped to the options passed to the request\n * @param {ParsedRequestOptions} requestOptions the same options used to make the request\n * @param {{ component: string, hostname: string, hookAttributes?: SpanAttributes }} options used to pass data needed to create attributes\n */\nexport const getOutgoingRequestAttributes = (\n requestOptions: ParsedRequestOptions,\n options: {\n component: string;\n hostname: string;\n port: string | number;\n hookAttributes?: SpanAttributes;\n }\n): SpanAttributes => {\n const hostname = options.hostname;\n const port = options.port;\n const requestMethod = requestOptions.method;\n const method = requestMethod ? requestMethod.toUpperCase() : 'GET';\n const headers = requestOptions.headers || {};\n const userAgent = headers['user-agent'];\n const attributes: SpanAttributes = {\n [SEMATTRS_HTTP_URL]: getAbsoluteUrl(\n requestOptions,\n headers,\n `${options.component}:`\n ),\n [SEMATTRS_HTTP_METHOD]: method,\n [SEMATTRS_HTTP_TARGET]: requestOptions.path || '/',\n [SEMATTRS_NET_PEER_NAME]: hostname,\n [SEMATTRS_HTTP_HOST]: headers.host ?? `${hostname}:${port}`,\n };\n\n if (userAgent !== undefined) {\n attributes[SEMATTRS_HTTP_USER_AGENT] = userAgent;\n }\n return Object.assign(attributes, options.hookAttributes);\n};\n\n/**\n * Returns outgoing request Metric attributes scoped to the request data\n * @param {SpanAttributes} spanAttributes the span attributes\n */\nexport const getOutgoingRequestMetricAttributes = (\n spanAttributes: SpanAttributes\n): MetricAttributes => {\n const metricAttributes: MetricAttributes = {};\n metricAttributes[SEMATTRS_HTTP_METHOD] = spanAttributes[SEMATTRS_HTTP_METHOD];\n metricAttributes[SEMATTRS_NET_PEER_NAME] =\n spanAttributes[SEMATTRS_NET_PEER_NAME];\n //TODO: http.url attribute, it should substitute any parameters to avoid high cardinality.\n return metricAttributes;\n};\n\n/**\n * Returns attributes related to the kind of HTTP protocol used\n * @param {string} [kind] Kind of HTTP protocol used: \"1.0\", \"1.1\", \"2\", \"SPDY\" or \"QUIC\".\n */\nexport const setAttributesFromHttpKind = (\n kind: string | undefined,\n attributes: SpanAttributes\n): void => {\n if (kind) {\n attributes[SEMATTRS_HTTP_FLAVOR] = kind;\n if (kind.toUpperCase() !== 'QUIC') {\n attributes[SEMATTRS_NET_TRANSPORT] = NETTRANSPORTVALUES_IP_TCP;\n } else {\n attributes[SEMATTRS_NET_TRANSPORT] = NETTRANSPORTVALUES_IP_UDP;\n }\n }\n};\n\n/**\n * Returns outgoing request attributes scoped to the response data\n * @param {IncomingMessage} response the response object\n * @param {{ hostname: string }} options used to pass data needed to create attributes\n */\nexport const getOutgoingRequestAttributesOnResponse = (\n response: IncomingMessage\n): SpanAttributes => {\n const { statusCode, statusMessage, httpVersion, socket } = response;\n const attributes: SpanAttributes = {};\n if (socket) {\n const { remoteAddress, remotePort } = socket;\n attributes[SEMATTRS_NET_PEER_IP] = remoteAddress;\n attributes[SEMATTRS_NET_PEER_PORT] = remotePort;\n }\n setResponseContentLengthAttribute(response, attributes);\n\n if (statusCode) {\n attributes[SEMATTRS_HTTP_STATUS_CODE] = statusCode;\n attributes[AttributeNames.HTTP_STATUS_TEXT] = (\n statusMessage || ''\n ).toUpperCase();\n }\n\n setAttributesFromHttpKind(httpVersion, attributes);\n return attributes;\n};\n\n/**\n * Returns outgoing request Metric attributes scoped to the response data\n * @param {SpanAttributes} spanAttributes the span attributes\n */\nexport const getOutgoingRequestMetricAttributesOnResponse = (\n spanAttributes: SpanAttributes\n): MetricAttributes => {\n const metricAttributes: MetricAttributes = {};\n metricAttributes[SEMATTRS_NET_PEER_PORT] =\n spanAttributes[SEMATTRS_NET_PEER_PORT];\n metricAttributes[SEMATTRS_HTTP_STATUS_CODE] =\n spanAttributes[SEMATTRS_HTTP_STATUS_CODE];\n metricAttributes[SEMATTRS_HTTP_FLAVOR] = spanAttributes[SEMATTRS_HTTP_FLAVOR];\n return metricAttributes;\n};\n\n/**\n * Returns incoming request attributes scoped to the request data\n * @param {IncomingMessage} request the request object\n * @param {{ component: string, serverName?: string, hookAttributes?: SpanAttributes }} options used to pass data needed to create attributes\n */\nexport const getIncomingRequestAttributes = (\n request: IncomingMessage,\n options: {\n component: string;\n serverName?: string;\n hookAttributes?: SpanAttributes;\n }\n): SpanAttributes => {\n const headers = request.headers;\n const userAgent = headers['user-agent'];\n const ips = headers['x-forwarded-for'];\n const method = request.method || 'GET';\n const httpVersion = request.httpVersion;\n const requestUrl = request.url ? url.parse(request.url) : null;\n const host = requestUrl?.host || headers.host;\n const hostname =\n requestUrl?.hostname ||\n host?.replace(/^(.*)(:[0-9]{1,5})/, '$1') ||\n 'localhost';\n const serverName = options.serverName;\n const attributes: SpanAttributes = {\n [SEMATTRS_HTTP_URL]: getAbsoluteUrl(\n requestUrl,\n headers,\n `${options.component}:`\n ),\n [SEMATTRS_HTTP_HOST]: host,\n [SEMATTRS_NET_HOST_NAME]: hostname,\n [SEMATTRS_HTTP_METHOD]: method,\n [SEMATTRS_HTTP_SCHEME]: options.component,\n };\n\n if (typeof ips === 'string') {\n attributes[SEMATTRS_HTTP_CLIENT_IP] = ips.split(',')[0];\n }\n\n if (typeof serverName === 'string') {\n attributes[SEMATTRS_HTTP_SERVER_NAME] = serverName;\n }\n\n if (requestUrl) {\n attributes[SEMATTRS_HTTP_TARGET] = requestUrl.path || '/';\n }\n\n if (userAgent !== undefined) {\n attributes[SEMATTRS_HTTP_USER_AGENT] = userAgent;\n }\n setRequestContentLengthAttribute(request, attributes);\n setAttributesFromHttpKind(httpVersion, attributes);\n return Object.assign(attributes, options.hookAttributes);\n};\n\n/**\n * Returns incoming request Metric attributes scoped to the request data\n * @param {SpanAttributes} spanAttributes the span attributes\n * @param {{ component: string }} options used to pass data needed to create attributes\n */\nexport const getIncomingRequestMetricAttributes = (\n spanAttributes: SpanAttributes\n): MetricAttributes => {\n const metricAttributes: MetricAttributes = {};\n metricAttributes[SEMATTRS_HTTP_SCHEME] = spanAttributes[SEMATTRS_HTTP_SCHEME];\n metricAttributes[SEMATTRS_HTTP_METHOD] = spanAttributes[SEMATTRS_HTTP_METHOD];\n metricAttributes[SEMATTRS_NET_HOST_NAME] =\n spanAttributes[SEMATTRS_NET_HOST_NAME];\n metricAttributes[SEMATTRS_HTTP_FLAVOR] = spanAttributes[SEMATTRS_HTTP_FLAVOR];\n //TODO: http.target attribute, it should substitute any parameters to avoid high cardinality.\n return metricAttributes;\n};\n\n/**\n * Returns incoming request attributes scoped to the response data\n * @param {(ServerResponse & { socket: Socket; })} response the response object\n */\nexport const getIncomingRequestAttributesOnResponse = (\n request: IncomingMessage,\n response: ServerResponse\n): SpanAttributes => {\n // take socket from the request,\n // since it may be detached from the response object in keep-alive mode\n const { socket } = request;\n const { statusCode, statusMessage } = response;\n\n const rpcMetadata = getRPCMetadata(context.active());\n const attributes: SpanAttributes = {};\n if (socket) {\n const { localAddress, localPort, remoteAddress, remotePort } = socket;\n attributes[SEMATTRS_NET_HOST_IP] = localAddress;\n attributes[SEMATTRS_NET_HOST_PORT] = localPort;\n attributes[SEMATTRS_NET_PEER_IP] = remoteAddress;\n attributes[SEMATTRS_NET_PEER_PORT] = remotePort;\n }\n attributes[SEMATTRS_HTTP_STATUS_CODE] = statusCode;\n attributes[AttributeNames.HTTP_STATUS_TEXT] = (\n statusMessage || ''\n ).toUpperCase();\n\n if (rpcMetadata?.type === RPCType.HTTP && rpcMetadata.route !== undefined) {\n attributes[SEMATTRS_HTTP_ROUTE] = rpcMetadata.route;\n }\n return attributes;\n};\n\n/**\n * Returns incoming request Metric attributes scoped to the request data\n * @param {SpanAttributes} spanAttributes the span attributes\n */\nexport const getIncomingRequestMetricAttributesOnResponse = (\n spanAttributes: SpanAttributes\n): MetricAttributes => {\n const metricAttributes: MetricAttributes = {};\n metricAttributes[SEMATTRS_HTTP_STATUS_CODE] =\n spanAttributes[SEMATTRS_HTTP_STATUS_CODE];\n metricAttributes[SEMATTRS_NET_HOST_PORT] =\n spanAttributes[SEMATTRS_NET_HOST_PORT];\n if (spanAttributes[SEMATTRS_HTTP_ROUTE] !== undefined) {\n metricAttributes[SEMATTRS_HTTP_ROUTE] = spanAttributes[SEMATTRS_HTTP_ROUTE];\n }\n return metricAttributes;\n};\n\nexport function headerCapture(type: 'request' | 'response', headers: string[]) {\n const normalizedHeaders = new Map();\n for (let i = 0, len = headers.length; i < len; i++) {\n const capturedHeader = headers[i].toLowerCase();\n normalizedHeaders.set(capturedHeader, capturedHeader.replace(/-/g, '_'));\n }\n\n return (\n span: Span,\n getHeader: (key: string) => undefined | string | string[] | number\n ) => {\n for (const capturedHeader of normalizedHeaders.keys()) {\n const value = getHeader(capturedHeader);\n\n if (value === undefined) {\n continue;\n }\n\n const normalizedHeader = normalizedHeaders.get(capturedHeader);\n const key = `http.${type}.header.${normalizedHeader}`;\n\n if (typeof value === 'string') {\n span.setAttribute(key, [value]);\n } else if (Array.isArray(value)) {\n span.setAttribute(key, value);\n } else {\n span.setAttribute(key, [value]);\n }\n }\n };\n}\n"]}