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Copyright (c) Microsoft Corporation.\n// Licensed under the MIT license.\n\nimport type * as http from \"http\";\nimport type * as https from \"https\";\nimport { HttpsProxyAgent } from \"https-proxy-agent\";\nimport { HttpProxyAgent } from \"http-proxy-agent\";\nimport type {\n PipelineRequest,\n PipelineResponse,\n ProxySettings,\n SendRequest,\n} from \"../interfaces.js\";\nimport type { PipelinePolicy } from \"../pipeline.js\";\nimport { logger } from \"../log.js\";\n\nconst HTTPS_PROXY = \"HTTPS_PROXY\";\nconst HTTP_PROXY = \"HTTP_PROXY\";\nconst ALL_PROXY = \"ALL_PROXY\";\nconst NO_PROXY = \"NO_PROXY\";\n\n/**\n * The programmatic identifier of the proxyPolicy.\n */\nexport const proxyPolicyName = \"proxyPolicy\";\n\n/**\n * Stores the patterns specified in NO_PROXY environment variable.\n * @internal\n */\nexport const globalNoProxyList: string[] = [];\nlet noProxyListLoaded: boolean = false;\n\n/** A cache of whether a host should bypass the proxy. */\nconst globalBypassedMap: Map = new Map();\n\nfunction getEnvironmentValue(name: string): string | undefined {\n if (process.env[name]) {\n return process.env[name];\n } else if (process.env[name.toLowerCase()]) {\n return process.env[name.toLowerCase()];\n }\n return undefined;\n}\n\nfunction loadEnvironmentProxyValue(): string | undefined {\n if (!process) {\n return undefined;\n }\n\n const httpsProxy = getEnvironmentValue(HTTPS_PROXY);\n const allProxy = getEnvironmentValue(ALL_PROXY);\n const httpProxy = getEnvironmentValue(HTTP_PROXY);\n\n return httpsProxy || allProxy || httpProxy;\n}\n\n/**\n * Check whether the host of a given `uri` matches any pattern in the no proxy list.\n * If there's a match, any request sent to the same host shouldn't have the proxy settings set.\n * This implementation is a port of https://github.com/Azure/azure-sdk-for-net/blob/8cca811371159e527159c7eb65602477898683e2/sdk/core/Azure.Core/src/Pipeline/Internal/HttpEnvironmentProxy.cs#L210\n */\nfunction isBypassed(\n uri: string,\n noProxyList: string[],\n bypassedMap?: Map,\n): boolean | undefined {\n if (noProxyList.length === 0) {\n return false;\n }\n const host = new URL(uri).hostname;\n if (bypassedMap?.has(host)) {\n return bypassedMap.get(host);\n }\n let isBypassedFlag = false;\n for (const pattern of noProxyList) {\n if (pattern[0] === \".\") {\n // This should match either domain it self or any subdomain or host\n // .foo.com will match foo.com it self or *.foo.com\n if (host.endsWith(pattern)) {\n isBypassedFlag = true;\n } else {\n if (host.length === pattern.length - 1 && host === pattern.slice(1)) {\n isBypassedFlag = true;\n }\n }\n } else {\n if (host === pattern) {\n isBypassedFlag = true;\n }\n }\n }\n bypassedMap?.set(host, isBypassedFlag);\n return isBypassedFlag;\n}\n\nexport function loadNoProxy(): string[] {\n const noProxy = getEnvironmentValue(NO_PROXY);\n noProxyListLoaded = true;\n if (noProxy) {\n return noProxy\n .split(\",\")\n .map((item) => item.trim())\n .filter((item) => item.length);\n }\n\n return [];\n}\n\n/**\n * This method converts a proxy url into `ProxySettings` for use with ProxyPolicy.\n * If no argument is given, it attempts to parse a proxy URL from the environment\n * variables `HTTPS_PROXY` or `HTTP_PROXY`.\n * @param proxyUrl - The url of the proxy to use. May contain authentication information.\n * @deprecated - Internally this method is no longer necessary when setting proxy information.\n */\nexport function getDefaultProxySettings(proxyUrl?: string): ProxySettings | undefined {\n if (!proxyUrl) {\n proxyUrl = loadEnvironmentProxyValue();\n if (!proxyUrl) {\n return undefined;\n }\n }\n\n const parsedUrl = new URL(proxyUrl);\n const schema = parsedUrl.protocol ? parsedUrl.protocol + \"//\" : \"\";\n return {\n host: schema + parsedUrl.hostname,\n port: Number.parseInt(parsedUrl.port || \"80\"),\n username: parsedUrl.username,\n password: parsedUrl.password,\n };\n}\n\n/**\n * This method attempts to parse a proxy URL from the environment\n * variables `HTTPS_PROXY` or `HTTP_PROXY`.\n */\nfunction getDefaultProxySettingsInternal(): URL | undefined {\n const envProxy = loadEnvironmentProxyValue();\n return envProxy ? new URL(envProxy) : undefined;\n}\n\nfunction getUrlFromProxySettings(settings: ProxySettings): URL {\n let parsedProxyUrl: URL;\n try {\n parsedProxyUrl = new URL(settings.host);\n } catch (_error) {\n throw new Error(\n `Expecting a valid host string in proxy settings, but found \"${settings.host}\".`,\n );\n }\n\n parsedProxyUrl.port = String(settings.port);\n if (settings.username) {\n parsedProxyUrl.username = settings.username;\n }\n if (settings.password) {\n parsedProxyUrl.password = settings.password;\n }\n\n return parsedProxyUrl;\n}\n\nfunction setProxyAgentOnRequest(\n request: PipelineRequest,\n cachedAgents: CachedAgents,\n proxyUrl: URL,\n): void {\n // Custom Agent should take precedence so if one is present\n // we should skip to avoid overwriting it.\n if (request.agent) {\n return;\n }\n\n const url = new URL(request.url);\n\n const isInsecure = url.protocol !== \"https:\";\n\n if (request.tlsSettings) {\n logger.warning(\n \"TLS settings are not supported in combination with custom Proxy, certificates provided to the client will be ignored.\",\n );\n }\n\n const headers = request.headers.toJSON();\n\n if (isInsecure) {\n if (!cachedAgents.httpProxyAgent) {\n cachedAgents.httpProxyAgent = new HttpProxyAgent(proxyUrl, { headers });\n }\n request.agent = cachedAgents.httpProxyAgent;\n } else {\n if (!cachedAgents.httpsProxyAgent) {\n cachedAgents.httpsProxyAgent = new HttpsProxyAgent(proxyUrl, { headers });\n }\n request.agent = cachedAgents.httpsProxyAgent;\n }\n}\n\ninterface CachedAgents {\n httpsProxyAgent?: https.Agent;\n httpProxyAgent?: http.Agent;\n}\n\n/**\n * A policy that allows one to apply proxy settings to all requests.\n * If not passed static settings, they will be retrieved from the HTTPS_PROXY\n * or HTTP_PROXY environment variables.\n * @param proxySettings - ProxySettings to use on each request.\n * @param options - additional settings, for example, custom NO_PROXY patterns\n */\nexport function proxyPolicy(\n proxySettings?: ProxySettings,\n options?: {\n /** a list of patterns to override those loaded from NO_PROXY environment variable. */\n customNoProxyList?: string[];\n },\n): PipelinePolicy {\n if (!noProxyListLoaded) {\n globalNoProxyList.push(...loadNoProxy());\n }\n\n const defaultProxy = proxySettings\n ? getUrlFromProxySettings(proxySettings)\n : getDefaultProxySettingsInternal();\n\n const cachedAgents: CachedAgents = {};\n\n return {\n name: proxyPolicyName,\n async sendRequest(request: PipelineRequest, next: SendRequest): Promise {\n if (\n !request.proxySettings &&\n defaultProxy &&\n !isBypassed(\n request.url,\n options?.customNoProxyList ?? globalNoProxyList,\n options?.customNoProxyList ? undefined : globalBypassedMap,\n )\n ) {\n setProxyAgentOnRequest(request, cachedAgents, defaultProxy);\n } else if (request.proxySettings) {\n setProxyAgentOnRequest(\n request,\n cachedAgents,\n getUrlFromProxySettings(request.proxySettings),\n );\n }\n return next(request);\n },\n };\n}\n"]}