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@flow\n\nimport http from 'http';\nimport https from 'https';\nimport {\n  boolean as parseBoolean,\n} from 'boolean';\nimport semver from 'semver';\nimport Logger from '../Logger';\nimport {\n  HttpProxyAgent,\n  HttpsProxyAgent,\n} from '../classes';\nimport {\n  UnexpectedStateError,\n} from '../errors';\nimport {\n  bindHttpMethod,\n  isUrlMatchingNoProxy,\n  parseProxyUrl,\n} from '../utilities';\nimport type {\n  ProxyAgentConfigurationInputType,\n  ProxyAgentConfigurationType,\n} from '../types';\nimport createProxyController from './createProxyController';\n\nconst httpGet = http.get;\nconst httpRequest = http.request;\nconst httpsGet = https.get;\nconst httpsRequest = https.request;\n\nconst log = Logger.child({\n  namespace: 'createGlobalProxyAgent',\n});\n\nconst defaultConfigurationInput = {\n  environmentVariableNamespace: undefined,\n  forceGlobalAgent: undefined,\n  socketConnectionTimeout: 60000,\n};\n\nconst omitUndefined = (subject) => {\n  const keys = Object.keys(subject);\n\n  const result = {};\n\n  for (const key of keys) {\n    const value = subject[key];\n\n    if (value !== undefined) {\n      result[key] = value;\n    }\n  }\n\n  return result;\n};\n\nconst createConfiguration = (configurationInput: ProxyAgentConfigurationInputType): ProxyAgentConfigurationType => {\n  // eslint-disable-next-line no-process-env\n  const environment = process.env;\n\n  const defaultConfiguration = {\n    environmentVariableNamespace: typeof environment.GLOBAL_AGENT_ENVIRONMENT_VARIABLE_NAMESPACE === 'string' ? environment.GLOBAL_AGENT_ENVIRONMENT_VARIABLE_NAMESPACE : 'GLOBAL_AGENT_',\n    forceGlobalAgent: typeof environment.GLOBAL_AGENT_FORCE_GLOBAL_AGENT === 'string' ? parseBoolean(environment.GLOBAL_AGENT_FORCE_GLOBAL_AGENT) : true,\n    socketConnectionTimeout: typeof environment.GLOBAL_AGENT_SOCKET_CONNECTION_TIMEOUT === 'string' ? Number.parseInt(environment.GLOBAL_AGENT_SOCKET_CONNECTION_TIMEOUT, 10) : defaultConfigurationInput.socketConnectionTimeout,\n  };\n\n  // $FlowFixMe\n  return {\n    ...defaultConfiguration,\n    ...omitUndefined(configurationInput),\n  };\n};\n\nexport default (configurationInput: ProxyAgentConfigurationInputType = defaultConfigurationInput) => {\n  const configuration = createConfiguration(configurationInput);\n\n  const proxyController = createProxyController();\n\n  // eslint-disable-next-line no-process-env\n  proxyController.HTTP_PROXY = process.env[configuration.environmentVariableNamespace + 'HTTP_PROXY'] || null;\n\n  // eslint-disable-next-line no-process-env\n  proxyController.HTTPS_PROXY = process.env[configuration.environmentVariableNamespace + 'HTTPS_PROXY'] || null;\n\n  // eslint-disable-next-line no-process-env\n  proxyController.NO_PROXY = process.env[configuration.environmentVariableNamespace + 'NO_PROXY'] || null;\n\n  log.info({\n    configuration,\n    state: proxyController,\n  }, 'global agent has been initialized');\n\n  const mustUrlUseProxy = (getProxy) => {\n    return (url) => {\n      if (!getProxy()) {\n        return false;\n      }\n\n      if (!proxyController.NO_PROXY) {\n        return true;\n      }\n\n      return !isUrlMatchingNoProxy(url, proxyController.NO_PROXY);\n    };\n  };\n\n  const getUrlProxy = (getProxy) => {\n    return () => {\n      const proxy = getProxy();\n\n      if (!proxy) {\n        throw new UnexpectedStateError('HTTP(S) proxy must be configured.');\n      }\n\n      return parseProxyUrl(proxy);\n    };\n  };\n\n  const getHttpProxy = () => {\n    return proxyController.HTTP_PROXY;\n  };\n\n  const BoundHttpProxyAgent = class extends HttpProxyAgent {\n    constructor () {\n      super(\n        () => {\n          return getHttpProxy();\n        },\n        mustUrlUseProxy(getHttpProxy),\n        getUrlProxy(getHttpProxy),\n        http.globalAgent,\n        configuration.socketConnectionTimeout,\n      );\n    }\n  };\n\n  const httpAgent = new BoundHttpProxyAgent();\n\n  const getHttpsProxy = () => {\n    return proxyController.HTTPS_PROXY || proxyController.HTTP_PROXY;\n  };\n\n  const BoundHttpsProxyAgent = class extends HttpsProxyAgent {\n    constructor () {\n      super(\n        () => {\n          return getHttpsProxy();\n        },\n        mustUrlUseProxy(getHttpsProxy),\n        getUrlProxy(getHttpsProxy),\n        https.globalAgent,\n        configuration.socketConnectionTimeout,\n      );\n    }\n  };\n\n  const httpsAgent = new BoundHttpsProxyAgent();\n\n  // Overriding globalAgent was added in v11.7.\n  // @see https://nodejs.org/uk/blog/release/v11.7.0/\n  if (semver.gte(process.version, 'v11.7.0')) {\n    // @see https://github.com/facebook/flow/issues/7670\n    // $FlowFixMe\n    http.globalAgent = httpAgent;\n\n    // $FlowFixMe\n    https.globalAgent = httpsAgent;\n  }\n\n  // The reason this logic is used in addition to overriding http(s).globalAgent\n  // is because there is no guarantee that we set http(s).globalAgent variable\n  // before an instance of http(s).Agent has been already constructed by someone,\n  // e.g. Stripe SDK creates instances of http(s).Agent at the top-level.\n  // @see https://github.com/gajus/global-agent/pull/13\n  //\n  // We still want to override http(s).globalAgent when possible to enable logic\n  // in `bindHttpMethod`.\n  if (semver.gte(process.version, 'v10.0.0')) {\n    // $FlowFixMe\n    http.get = bindHttpMethod(httpGet, httpAgent, configuration.forceGlobalAgent);\n\n    // $FlowFixMe\n    http.request = bindHttpMethod(httpRequest, httpAgent, configuration.forceGlobalAgent);\n\n    // $FlowFixMe\n    https.get = bindHttpMethod(httpsGet, httpsAgent, configuration.forceGlobalAgent);\n\n    // $FlowFixMe\n    https.request = bindHttpMethod(httpsRequest, httpsAgent, configuration.forceGlobalAgent);\n  } else {\n    log.warn('attempt to initialize global-agent in unsupported Node.js version was ignored');\n  }\n\n  return proxyController;\n};\n"],"file":"createGlobalProxyAgent.js"}