aws-cdk
Version:
CDK Toolkit, the command line tool for CDK apps
153 lines • 20.9 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.CredentialPlugins = void 0;
const util_1 = require("util");
const provider_caching_1 = require("./provider-caching");
const logging_1 = require("../../logging");
const error_1 = require("../../toolkit/error");
const error_2 = require("../../util/error");
const plugin_1 = require("../plugin/plugin");
/**
* Cache for credential providers.
*
* Given an account and an operating mode (read or write) will return an
* appropriate credential provider for credentials for the given account. The
* credential provider will be cached so that multiple AWS clients for the same
* environment will not make multiple network calls to obtain credentials.
*
* Will use default credentials if they are for the right account; otherwise,
* all loaded credential provider plugins will be tried to obtain credentials
* for the given account.
*/
class CredentialPlugins {
constructor(host) {
this.cache = {};
this.host = host ?? plugin_1.PluginHost.instance;
}
async fetchCredentialsFor(awsAccountId, mode) {
const key = `${awsAccountId}-${mode}`;
if (!(key in this.cache)) {
this.cache[key] = await this.lookupCredentials(awsAccountId, mode);
}
return this.cache[key];
}
get availablePluginNames() {
return this.host.credentialProviderSources.map((s) => s.name);
}
async lookupCredentials(awsAccountId, mode) {
const triedSources = [];
// Otherwise, inspect the various credential sources we have
for (const source of this.host.credentialProviderSources) {
let available;
try {
available = await source.isAvailable();
}
catch (e) {
// This shouldn't happen, but let's guard against it anyway
(0, logging_1.warning)(`Uncaught exception in ${source.name}: ${(0, error_2.formatErrorMessage)(e)}`);
available = false;
}
if (!available) {
(0, logging_1.debug)('Credentials source %s is not available, ignoring it.', source.name);
continue;
}
triedSources.push(source);
let canProvide;
try {
canProvide = await source.canProvideCredentials(awsAccountId);
}
catch (e) {
// This shouldn't happen, but let's guard against it anyway
(0, logging_1.warning)(`Uncaught exception in ${source.name}: ${(0, error_2.formatErrorMessage)(e)}`);
canProvide = false;
}
if (!canProvide) {
continue;
}
(0, logging_1.debug)(`Using ${source.name} credentials for account ${awsAccountId}`);
return {
credentials: await v3ProviderFromPlugin(() => source.getProvider(awsAccountId, mode, {
supportsV3Providers: true,
})),
pluginName: source.name,
};
}
return undefined;
}
}
exports.CredentialPlugins = CredentialPlugins;
/**
* Take a function that calls the plugin, and turn it into an SDKv3-compatible credential provider.
*
* What we will do is the following:
*
* - Query the plugin and see what kind of result it gives us.
* - If the result is self-refreshing or doesn't need refreshing, we turn it into an SDKv3 provider
* and return it directly.
* * If the underlying return value is a provider, we will make it a caching provider
* (because we can't know if it will cache by itself or not).
* * If the underlying return value is a static credential, caching isn't relevant.
* * If the underlying return value is V2 credentials, those have caching built-in.
* - If the result is a static credential that expires, we will wrap it in an SDKv3 provider
* that will query the plugin again when the credential expires.
*/
async function v3ProviderFromPlugin(producer) {
const initial = await producer();
if (isV3Provider(initial)) {
// Already a provider, make caching
return (0, provider_caching_1.makeCachingProvider)(initial);
}
else if (isV3Credentials(initial) && initial.expiration === undefined) {
// Static credentials that don't need refreshing nor caching
return () => Promise.resolve(initial);
}
else if (isV3Credentials(initial) && initial.expiration !== undefined) {
// Static credentials that do need refreshing and caching
return refreshFromPluginProvider(initial, producer);
}
else if (isV2Credentials(initial)) {
// V2 credentials that refresh and cache themselves
return v3ProviderFromV2Credentials(initial);
}
else {
throw new error_1.AuthenticationError(`Plugin returned a value that doesn't resemble AWS credentials: ${(0, util_1.inspect)(initial)}`);
}
}
/**
* Converts a V2 credential into a V3-compatible provider
*/
function v3ProviderFromV2Credentials(x) {
return async () => {
// Get will fetch or refresh as necessary
await x.getPromise();
return {
accessKeyId: x.accessKeyId,
secretAccessKey: x.secretAccessKey,
sessionToken: x.sessionToken,
expiration: x.expireTime ?? undefined,
};
};
}
function refreshFromPluginProvider(current, producer) {
return async () => {
(0, logging_1.info)((0, util_1.format)(current), Date.now());
if ((0, provider_caching_1.credentialsAboutToExpire)(current)) {
const newCreds = await producer();
if (!isV3Credentials(newCreds)) {
throw new error_1.AuthenticationError(`Plugin initially returned static V3 credentials but now returned something else: ${(0, util_1.inspect)(newCreds)}`);
}
current = newCreds;
}
return current;
};
}
function isV3Provider(x) {
return typeof x === 'function';
}
function isV2Credentials(x) {
return !!(x && typeof x === 'object' && x.getPromise);
}
function isV3Credentials(x) {
return !!(x && typeof x === 'object' && x.accessKeyId && !isV2Credentials(x));
}
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The\n * credential provider will be cached so that multiple AWS clients for the same\n * environment will not make multiple network calls to obtain credentials.\n *\n * Will use default credentials if they are for the right account; otherwise,\n * all loaded credential provider plugins will be tried to obtain credentials\n * for the given account.\n */\nexport class CredentialPlugins {\n  private readonly cache: { [key: string]: PluginCredentialsFetchResult | undefined } = {};\n  private readonly host: PluginHost;\n\n  constructor(host?: PluginHost) {\n    this.host = host ?? PluginHost.instance;\n  }\n\n  public async fetchCredentialsFor(awsAccountId: string, mode: Mode): Promise<PluginCredentialsFetchResult | undefined> {\n    const key = `${awsAccountId}-${mode}`;\n    if (!(key in this.cache)) {\n      this.cache[key] = await this.lookupCredentials(awsAccountId, mode);\n    }\n    return this.cache[key];\n  }\n\n  public get availablePluginNames(): string[] {\n    return this.host.credentialProviderSources.map((s) => s.name);\n  }\n\n  private async lookupCredentials(awsAccountId: string, mode: Mode): Promise<PluginCredentialsFetchResult | undefined> {\n    const triedSources: CredentialProviderSource[] = [];\n    // Otherwise, inspect the various credential sources we have\n    for (const source of this.host.credentialProviderSources) {\n      let available: boolean;\n      try {\n        available = await source.isAvailable();\n      } catch (e: any) {\n        // This shouldn't happen, but let's guard against it anyway\n        warning(`Uncaught exception in ${source.name}: ${formatErrorMessage(e)}`);\n        available = false;\n      }\n\n      if (!available) {\n        debug('Credentials source %s is not available, ignoring it.', source.name);\n        continue;\n      }\n      triedSources.push(source);\n      let canProvide: boolean;\n      try {\n        canProvide = await source.canProvideCredentials(awsAccountId);\n      } catch (e: any) {\n        // This shouldn't happen, but let's guard against it anyway\n        warning(`Uncaught exception in ${source.name}: ${formatErrorMessage(e)}`);\n        canProvide = false;\n      }\n      if (!canProvide) {\n        continue;\n      }\n      debug(`Using ${source.name} credentials for account ${awsAccountId}`);\n\n      return {\n        credentials: await v3ProviderFromPlugin(() => source.getProvider(awsAccountId, mode as ForReading | ForWriting, {\n          supportsV3Providers: true,\n        })),\n        pluginName: source.name,\n      };\n    }\n    return undefined;\n  }\n}\n\n/**\n * Result from trying to fetch credentials from the Plugin host\n */\nexport interface PluginCredentialsFetchResult {\n  /**\n   * SDK-v3 compatible credential provider\n   */\n  readonly credentials: AwsCredentialIdentityProvider;\n\n  /**\n   * Name of plugin that successfully provided credentials\n   */\n  readonly pluginName: string;\n}\n\n/**\n * Take a function that calls the plugin, and turn it into an SDKv3-compatible credential provider.\n *\n * What we will do is the following:\n *\n * - Query the plugin and see what kind of result it gives us.\n * - If the result is self-refreshing or doesn't need refreshing, we turn it into an SDKv3 provider\n *   and return it directly.\n *   * If the underlying return value is a provider, we will make it a caching provider\n *     (because we can't know if it will cache by itself or not).\n *   * If the underlying return value is a static credential, caching isn't relevant.\n *   * If the underlying return value is V2 credentials, those have caching built-in.\n * - If the result is a static credential that expires, we will wrap it in an SDKv3 provider\n *   that will query the plugin again when the credential expires.\n */\nasync function v3ProviderFromPlugin(producer: () => Promise<PluginProviderResult>): Promise<AwsCredentialIdentityProvider> {\n  const initial = await producer();\n\n  if (isV3Provider(initial)) {\n    // Already a provider, make caching\n    return makeCachingProvider(initial);\n  } else if (isV3Credentials(initial) && initial.expiration === undefined) {\n    // Static credentials that don't need refreshing nor caching\n    return () => Promise.resolve(initial);\n  } else if (isV3Credentials(initial) && initial.expiration !== undefined) {\n    // Static credentials that do need refreshing and caching\n    return refreshFromPluginProvider(initial, producer);\n  } else if (isV2Credentials(initial)) {\n    // V2 credentials that refresh and cache themselves\n    return v3ProviderFromV2Credentials(initial);\n  } else {\n    throw new AuthenticationError(`Plugin returned a value that doesn't resemble AWS credentials: ${inspect(initial)}`);\n  }\n}\n\n/**\n * Converts a V2 credential into a V3-compatible provider\n */\nfunction v3ProviderFromV2Credentials(x: SDKv2CompatibleCredentials): AwsCredentialIdentityProvider {\n  return async () => {\n    // Get will fetch or refresh as necessary\n    await x.getPromise();\n\n    return {\n      accessKeyId: x.accessKeyId,\n      secretAccessKey: x.secretAccessKey,\n      sessionToken: x.sessionToken,\n      expiration: x.expireTime ?? undefined,\n    };\n  };\n}\n\nfunction refreshFromPluginProvider(current: AwsCredentialIdentity, producer: () => Promise<PluginProviderResult>): AwsCredentialIdentityProvider {\n  return async () => {\n    info(format(current), Date.now());\n    if (credentialsAboutToExpire(current)) {\n      const newCreds = await producer();\n      if (!isV3Credentials(newCreds)) {\n        throw new AuthenticationError(`Plugin initially returned static V3 credentials but now returned something else: ${inspect(newCreds)}`);\n      }\n      current = newCreds;\n    }\n    return current;\n  };\n}\n\nfunction isV3Provider(x: PluginProviderResult): x is SDKv3CompatibleCredentialProvider {\n  return typeof x === 'function';\n}\n\nfunction isV2Credentials(x: PluginProviderResult): x is SDKv2CompatibleCredentials {\n  return !!(x && typeof x === 'object' && (x as SDKv2CompatibleCredentials).getPromise);\n}\n\nfunction isV3Credentials(x: PluginProviderResult): x is SDKv3CompatibleCredentials {\n  return !!(x && typeof x === 'object' && x.accessKeyId && !isV2Credentials(x));\n}\n"]}