246 lines
9.0 KiB
JavaScript
246 lines
9.0 KiB
JavaScript
"use strict";
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/**
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* Copyright 2018 Google LLC
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*
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* Distributed under MIT license.
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* See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
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*/
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.requestTimeout = exports.resetIsAvailableCache = exports.isAvailable = exports.project = exports.instance = exports.HEADERS = exports.HEADER_VALUE = exports.HEADER_NAME = exports.SECONDARY_HOST_ADDRESS = exports.HOST_ADDRESS = exports.BASE_PATH = void 0;
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const gaxios_1 = require("gaxios");
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const jsonBigint = require('json-bigint'); // eslint-disable-line
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exports.BASE_PATH = '/computeMetadata/v1';
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exports.HOST_ADDRESS = 'http://169.254.169.254';
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exports.SECONDARY_HOST_ADDRESS = 'http://metadata.google.internal.';
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exports.HEADER_NAME = 'Metadata-Flavor';
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exports.HEADER_VALUE = 'Google';
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exports.HEADERS = Object.freeze({ [exports.HEADER_NAME]: exports.HEADER_VALUE });
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/**
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* Returns the base URL while taking into account the GCE_METADATA_HOST
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* environment variable if it exists.
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*
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* @returns The base URL, e.g., http://169.254.169.254/computeMetadata/v1.
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*/
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function getBaseUrl(baseUrl) {
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if (!baseUrl) {
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baseUrl =
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process.env.GCE_METADATA_IP ||
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process.env.GCE_METADATA_HOST ||
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exports.HOST_ADDRESS;
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}
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// If no scheme is provided default to HTTP:
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if (!/^https?:\/\//.test(baseUrl)) {
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baseUrl = `http://${baseUrl}`;
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}
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return new URL(exports.BASE_PATH, baseUrl).href;
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}
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// Accepts an options object passed from the user to the API. In previous
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// versions of the API, it referred to a `Request` or an `Axios` request
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// options object. Now it refers to an object with very limited property
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// names. This is here to help ensure users don't pass invalid options when
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// they upgrade from 0.4 to 0.5 to 0.8.
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function validate(options) {
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Object.keys(options).forEach(key => {
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switch (key) {
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case 'params':
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case 'property':
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case 'headers':
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break;
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case 'qs':
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throw new Error("'qs' is not a valid configuration option. Please use 'params' instead.");
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default:
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throw new Error(`'${key}' is not a valid configuration option.`);
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}
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});
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}
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async function metadataAccessor(type, options, noResponseRetries = 3, fastFail = false) {
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options = options || {};
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if (typeof options === 'string') {
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options = { property: options };
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}
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let property = '';
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if (typeof options === 'object' && options.property) {
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property = '/' + options.property;
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}
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validate(options);
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try {
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const requestMethod = fastFail ? fastFailMetadataRequest : gaxios_1.request;
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const res = await requestMethod({
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url: `${getBaseUrl()}/${type}${property}`,
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headers: Object.assign({}, exports.HEADERS, options.headers),
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retryConfig: { noResponseRetries },
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params: options.params,
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responseType: 'text',
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timeout: requestTimeout(),
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});
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// NOTE: node.js converts all incoming headers to lower case.
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if (res.headers[exports.HEADER_NAME.toLowerCase()] !== exports.HEADER_VALUE) {
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throw new Error(`Invalid response from metadata service: incorrect ${exports.HEADER_NAME} header.`);
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}
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else if (!res.data) {
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throw new Error('Invalid response from the metadata service');
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}
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if (typeof res.data === 'string') {
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try {
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return jsonBigint.parse(res.data);
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}
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catch (_a) {
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/* ignore */
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}
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}
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return res.data;
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}
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catch (e) {
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if (e.response && e.response.status !== 200) {
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e.message = `Unsuccessful response status code. ${e.message}`;
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}
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throw e;
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}
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}
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async function fastFailMetadataRequest(options) {
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const secondaryOptions = {
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...options,
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url: options.url.replace(getBaseUrl(), getBaseUrl(exports.SECONDARY_HOST_ADDRESS)),
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};
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// We race a connection between DNS/IP to metadata server. There are a couple
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// reasons for this:
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//
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// 1. the DNS is slow in some GCP environments; by checking both, we might
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// detect the runtime environment signficantly faster.
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// 2. we can't just check the IP, which is tarpitted and slow to respond
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// on a user's local machine.
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//
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// Additional logic has been added to make sure that we don't create an
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// unhandled rejection in scenarios where a failure happens sometime
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// after a success.
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//
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// Note, however, if a failure happens prior to a success, a rejection should
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// occur, this is for folks running locally.
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//
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let responded = false;
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const r1 = gaxios_1.request(options)
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.then(res => {
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responded = true;
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return res;
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})
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.catch(err => {
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if (responded) {
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return r2;
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}
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else {
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responded = true;
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throw err;
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}
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});
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const r2 = gaxios_1.request(secondaryOptions)
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.then(res => {
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responded = true;
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return res;
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})
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.catch(err => {
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if (responded) {
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return r1;
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}
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else {
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responded = true;
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throw err;
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}
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});
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return Promise.race([r1, r2]);
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}
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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function instance(options) {
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return metadataAccessor('instance', options);
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}
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exports.instance = instance;
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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function project(options) {
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return metadataAccessor('project', options);
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}
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exports.project = project;
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/*
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* How many times should we retry detecting GCP environment.
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*/
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function detectGCPAvailableRetries() {
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return process.env.DETECT_GCP_RETRIES
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? Number(process.env.DETECT_GCP_RETRIES)
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: 0;
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}
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/**
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* Determine if the metadata server is currently available.
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*/
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let cachedIsAvailableResponse;
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async function isAvailable() {
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try {
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// If a user is instantiating several GCP libraries at the same time,
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// this may result in multiple calls to isAvailable(), to detect the
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// runtime environment. We use the same promise for each of these calls
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// to reduce the network load.
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if (cachedIsAvailableResponse === undefined) {
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cachedIsAvailableResponse = metadataAccessor('instance', undefined, detectGCPAvailableRetries(),
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// If the default HOST_ADDRESS has been overridden, we should not
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// make an effort to try SECONDARY_HOST_ADDRESS (as we are likely in
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// a non-GCP environment):
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!(process.env.GCE_METADATA_IP || process.env.GCE_METADATA_HOST));
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}
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await cachedIsAvailableResponse;
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return true;
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}
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catch (err) {
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if (process.env.DEBUG_AUTH) {
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console.info(err);
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}
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if (err.type === 'request-timeout') {
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// If running in a GCP environment, metadata endpoint should return
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// within ms.
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return false;
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}
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if (err.response && err.response.status === 404) {
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return false;
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}
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else {
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if (!(err.response && err.response.status === 404) &&
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// A warning is emitted if we see an unexpected err.code, or err.code
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// is not populated:
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(!err.code ||
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![
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'EHOSTDOWN',
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'EHOSTUNREACH',
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'ENETUNREACH',
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'ENOENT',
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'ENOTFOUND',
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'ECONNREFUSED',
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].includes(err.code))) {
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let code = 'UNKNOWN';
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if (err.code)
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code = err.code;
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process.emitWarning(`received unexpected error = ${err.message} code = ${code}`, 'MetadataLookupWarning');
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}
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// Failure to resolve the metadata service means that it is not available.
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return false;
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}
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}
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}
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exports.isAvailable = isAvailable;
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/**
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* reset the memoized isAvailable() lookup.
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*/
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function resetIsAvailableCache() {
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cachedIsAvailableResponse = undefined;
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}
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exports.resetIsAvailableCache = resetIsAvailableCache;
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function requestTimeout() {
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// In testing, we were able to reproduce behavior similar to
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// https://github.com/googleapis/google-auth-library-nodejs/issues/798
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// by making many concurrent network requests. Requests do not actually fail,
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// rather they take significantly longer to complete (and we hit our
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// default 3000ms timeout).
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//
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// This logic detects a GCF environment, using the documented environment
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// variables K_SERVICE and FUNCTION_NAME:
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// https://cloud.google.com/functions/docs/env-var and, in a GCF environment
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// eliminates timeouts (by setting the value to 0 to disable).
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return process.env.K_SERVICE || process.env.FUNCTION_NAME ? 0 : 3000;
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}
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exports.requestTimeout = requestTimeout;
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//# sourceMappingURL=index.js.map
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