sdk.js
  1  "use strict";
  2  Object.defineProperty(exports, "__esModule", { value: true });
  3  exports.SDK = void 0;
  4  const AWS = require("aws-sdk");
  5  const logging_1 = require("../../logging");
  6  const functions_1 = require("../../util/functions");
  7  const account_cache_1 = require("./account-cache");
  8  /**
  9   * Base functionality of SDK without credential fetching
 10   */
 11  class SDK {
 12      constructor(_credentials, region, httpOptions = {}, sdkOptions = {}) {
 13          this._credentials = _credentials;
 14          this.sdkOptions = sdkOptions;
 15          /**
 16           * Default retry options for SDK clients.
 17           */
 18          this.retryOptions = { maxRetries: 6, retryDelayOptions: { base: 300 } };
 19          /**
 20           * The more generous retry policy for CloudFormation, which has a 1 TPM limit on certain APIs,
 21           * which are abundantly used for deployment tracking, ...
 22           *
 23           * So we're allowing way more retries, but waiting a bit more.
 24           */
 25          this.cloudFormationRetryOptions = { maxRetries: 10, retryDelayOptions: { base: 1000 } };
 26          this.config = {
 27              ...httpOptions,
 28              ...this.retryOptions,
 29              credentials: _credentials,
 30              region,
 31              logger: { log: (...messages) => messages.forEach(m => logging_1.trace('%s', m)) },
 32          };
 33          this.currentRegion = region;
 34      }
 35      cloudFormation() {
 36          return this.wrapServiceErrorHandling(new AWS.CloudFormation({
 37              ...this.config,
 38              ...this.cloudFormationRetryOptions,
 39          }));
 40      }
 41      ec2() {
 42          return this.wrapServiceErrorHandling(new AWS.EC2(this.config));
 43      }
 44      ssm() {
 45          return this.wrapServiceErrorHandling(new AWS.SSM(this.config));
 46      }
 47      s3() {
 48          return this.wrapServiceErrorHandling(new AWS.S3(this.config));
 49      }
 50      route53() {
 51          return this.wrapServiceErrorHandling(new AWS.Route53(this.config));
 52      }
 53      ecr() {
 54          return this.wrapServiceErrorHandling(new AWS.ECR(this.config));
 55      }
 56      elbv2() {
 57          return this.wrapServiceErrorHandling(new AWS.ELBv2(this.config));
 58      }
 59      secretsManager() {
 60          return this.wrapServiceErrorHandling(new AWS.SecretsManager(this.config));
 61      }
 62      async currentAccount() {
 63          // Get/refresh if necessary before we can access `accessKeyId`
 64          await this.forceCredentialRetrieval();
 65          return functions_1.cached(this, CURRENT_ACCOUNT_KEY, () => SDK.accountCache.fetch(this._credentials.accessKeyId, async () => {
 66              // if we don't have one, resolve from STS and store in cache.
 67              logging_1.debug('Looking up default account ID from STS');
 68              const result = await new AWS.STS(this.config).getCallerIdentity().promise();
 69              const accountId = result.Account;
 70              const partition = result.Arn.split(':')[1];
 71              if (!accountId) {
 72                  throw new Error('STS didn\'t return an account ID');
 73              }
 74              logging_1.debug('Default account ID:', accountId);
 75              return { accountId, partition };
 76          }));
 77      }
 78      /**
 79       * Return the current credentials
 80       *
 81       * Don't use -- only used to write tests around assuming roles.
 82       */
 83      async currentCredentials() {
 84          await this.forceCredentialRetrieval();
 85          return this._credentials;
 86      }
 87      /**
 88       * Force retrieval of the current credentials
 89       *
 90       * Relevant if the current credentials are AssumeRole credentials -- do the actual
 91       * lookup, and translate any error into a useful error message (taking into
 92       * account credential provenance).
 93       */
 94      async forceCredentialRetrieval() {
 95          try {
 96              await this._credentials.getPromise();
 97          }
 98          catch (e) {
 99              logging_1.debug(`Assuming role failed: ${e.message}`);
100              throw new Error([
101                  'Could not assume role in target account',
102                  ...this.sdkOptions.assumeRoleCredentialsSourceDescription
103                      ? [`using ${this.sdkOptions.assumeRoleCredentialsSourceDescription}`]
104                      : [],
105                  e.message,
106                  '. Please make sure that this role exists in the account. If it doesn\'t exist, (re)-bootstrap the environment ' +
107                      'with the right \'--trust\', using the latest version of the CDK CLI.',
108              ].join(' '));
109          }
110      }
111      /**
112       * Return a wrapping object for the underlying service object
113       *
114       * Responds to failures in the underlying service calls, in two different
115       * ways:
116       *
117       * - When errors are encountered, log the failing call and the error that
118       *   it triggered (at debug level). This is necessary because the lack of
119       *   stack traces in NodeJS otherwise makes it very hard to suss out where
120       *   a certain AWS error occurred.
121       * - The JS SDK has a funny business of wrapping any credential-based error
122       *   in a super-generic (and in our case wrong) exception. If we then use a
123       *   'ChainableTemporaryCredentials' and the target role doesn't exist,
124       *   the error message that shows up by default is super misleading
125       *   (https://github.com/aws/aws-sdk-js/issues/3272). We can fix this because
126       *   the exception contains the "inner exception", so we unwrap and throw
127       *   the correct error ("cannot assume role").
128       *
129       * The wrapping business below is slightly more complicated than you'd think
130       * because we must hook into the `promise()` method of the object that's being
131       * returned from the methods of the object that we wrap, so there's two
132       * levels of wrapping going on, and also some exceptions to the wrapping magic.
133       */
134      wrapServiceErrorHandling(serviceObject) {
135          const classObject = serviceObject.constructor.prototype;
136          const self = this;
137          return new Proxy(serviceObject, {
138              get(obj, prop) {
139                  const real = obj[prop];
140                  // Things we don't want to intercept:
141                  // - Anything that's not a function.
142                  // - 'constructor', s3.upload() will use this to do some magic and we need the underlying constructor.
143                  // - Any method that's not on the service class (do not intercept 'makeRequest' and other helpers).
144                  if (prop === 'constructor' || !classObject.hasOwnProperty(prop) || !isFunction(real)) {
145                      return real;
146                  }
147                  // NOTE: This must be a function() and not an () => {
148                  // because I need 'this' to be dynamically bound and not statically bound.
149                  // If your linter complains don't listen to it!
150                  return function () {
151                      // Call the underlying function. If it returns an object with a promise()
152                      // method on it, wrap that 'promise' method.
153                      const args = [].slice.call(arguments, 0);
154                      const response = real.apply(this, args);
155                      // Don't intercept unless the return value is an object with a '.promise()' method.
156                      if (typeof response !== 'object' || !response) {
157                          return response;
158                      }
159                      if (!('promise' in response)) {
160                          return response;
161                      }
162                      // Return an object with the promise method replaced with a wrapper which will
163                      // do additional things to errors.
164                      return Object.assign(Object.create(response), {
165                          promise() {
166                              return response.promise().catch((e) => {
167                                  e = self.makeDetailedException(e);
168                                  logging_1.debug(`Call failed: ${prop}(${JSON.stringify(args[0])}) => ${e.message} (code=${e.code})`);
169                                  return Promise.reject(e); // Re-'throw' the new error
170                              });
171                          },
172                      });
173                  };
174              },
175          });
176      }
177      /**
178       * Extract a more detailed error out of a generic error if we can
179       *
180       * If this is an error about Assuming Roles, add in the context showing the
181       * chain of credentials we used to try to assume the role.
182       */
183      makeDetailedException(e) {
184          // This is the super-generic "something's wrong" error that the JS SDK wraps other errors in.
185          // https://github.com/aws/aws-sdk-js/blob/f0ac2e53457c7512883d0677013eacaad6cd8a19/lib/event_listeners.js#L84
186          if (typeof e.message === 'string' && e.message.startsWith('Missing credentials in config')) {
187              const original = e.originalError;
188              if (original) {
189                  // When the SDK does a 'util.copy', they lose the Error-ness of the inner error
190                  // (they copy the Error's properties into a plain object) so make it an Error object again.
191                  e = Object.assign(new Error(), original);
192              }
193          }
194          // At this point, the error might still be a generic "ChainableTemporaryCredentials failed"
195          // error which wraps the REAL error (AssumeRole failed). We're going to replace the error
196          // message with one that's more likely to help users, and tell them the most probable
197          // fix (bootstrapping). The underlying service call failure will be appended below.
198          if (e.message === 'Could not load credentials from ChainableTemporaryCredentials') {
199              e.message = [
200                  'Could not assume role in target account',
201                  ...this.sdkOptions.assumeRoleCredentialsSourceDescription
202                      ? [`using ${this.sdkOptions.assumeRoleCredentialsSourceDescription}`]
203                      : [],
204                  '(did you bootstrap the environment with the right \'--trust\'s?)',
205              ].join(' ');
206          }
207          // Replace the message on this error with a concatenation of all inner error messages.
208          // Must more clear what's going on that way.
209          e.message = allChainedExceptionMessages(e);
210          return e;
211      }
212  }
213  exports.SDK = SDK;
214  SDK.accountCache = new account_cache_1.AccountAccessKeyCache();
215  const CURRENT_ACCOUNT_KEY = Symbol('current_account_key');
216  function isFunction(x) {
217      return x && {}.toString.call(x) === '[object Function]';
218  }
219  /**
220   * Return the concatenated message of all exceptions in the AWS exception chain
221   */
222  function allChainedExceptionMessages(e) {
223      const ret = new Array();
224      while (e) {
225          ret.push(e.message);
226          e = e.originalError;
227      }
228      return ret.join(': ');
229  }
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* as AWS from 'aws-sdk';\nimport type { ConfigurationOptions } from 'aws-sdk/lib/config-base';\nimport { debug, trace } from '../../logging';\nimport { cached } from '../../util/functions';\nimport { AccountAccessKeyCache } from './account-cache';\nimport { Account } from './sdk-provider';\n\nexport interface ISDK {\n  /**\n   * The region this SDK has been instantiated for\n   *\n   * (As distinct from the `defaultRegion()` on SdkProvider which\n   * represents the region configured in the default config).\n   */\n  readonly currentRegion: string;\n\n  /**\n   * The Account this SDK has been instantiated for\n   *\n   * (As distinct from the `defaultAccount()` on SdkProvider which\n   * represents the account available by using default credentials).\n   */\n  currentAccount(): Promise<Account>;\n\n  cloudFormation(): AWS.CloudFormation;\n  ec2(): AWS.EC2;\n  ssm(): AWS.SSM;\n  s3(): AWS.S3;\n  route53(): AWS.Route53;\n  ecr(): AWS.ECR;\n  elbv2(): AWS.ELBv2;\n  secretsManager(): AWS.SecretsManager;\n}\n\n/**\n * Additional SDK configuration options\n */\nexport interface SdkOptions {\n  /**\n   * Additional descriptive strings that indicate where the \"AssumeRole\" credentials are coming from\n   *\n   * Will be printed in an error message to help users diagnose auth problems.\n   */\n  readonly assumeRoleCredentialsSourceDescription?: string;\n}\n\n/**\n * Base functionality of SDK without credential fetching\n */\nexport class SDK implements ISDK {\n  private static readonly accountCache = new AccountAccessKeyCache();\n\n  public readonly currentRegion: string;\n\n  private readonly config: ConfigurationOptions;\n\n  /**\n   * Default retry options for SDK clients.\n   */\n  private readonly retryOptions = { maxRetries: 6, retryDelayOptions: { base: 300 } };\n\n  /**\n   * The more generous retry policy for CloudFormation, which has a 1 TPM limit on certain APIs,\n   * which are abundantly used for deployment tracking, ...\n   *\n   * So we're allowing way more retries, but waiting a bit more.\n   */\n  private readonly cloudFormationRetryOptions = { maxRetries: 10, retryDelayOptions: { base: 1_000 } };\n\n  constructor(\n    private readonly _credentials: AWS.Credentials,\n    region: string,\n    httpOptions: ConfigurationOptions = {},\n    private readonly sdkOptions: SdkOptions = {}) {\n\n    this.config = {\n      ...httpOptions,\n      ...this.retryOptions,\n      credentials: _credentials,\n      region,\n      logger: { log: (...messages) => messages.forEach(m => trace('%s', m)) },\n    };\n    this.currentRegion = region;\n  }\n\n  public cloudFormation(): AWS.CloudFormation {\n    return this.wrapServiceErrorHandling(new AWS.CloudFormation({\n      ...this.config,\n      ...this.cloudFormationRetryOptions,\n    }));\n  }\n\n  public ec2(): AWS.EC2 {\n    return this.wrapServiceErrorHandling(new AWS.EC2(this.config));\n  }\n\n  public ssm(): AWS.SSM {\n    return this.wrapServiceErrorHandling(new AWS.SSM(this.config));\n  }\n\n  public s3(): AWS.S3 {\n    return this.wrapServiceErrorHandling(new AWS.S3(this.config));\n  }\n\n  public route53(): AWS.Route53 {\n    return this.wrapServiceErrorHandling(new AWS.Route53(this.config));\n  }\n\n  public ecr(): AWS.ECR {\n    return this.wrapServiceErrorHandling(new AWS.ECR(this.config));\n  }\n\n  public elbv2(): AWS.ELBv2 {\n    return this.wrapServiceErrorHandling(new AWS.ELBv2(this.config));\n  }\n\n  public secretsManager(): AWS.SecretsManager {\n    return this.wrapServiceErrorHandling(new AWS.SecretsManager(this.config));\n  }\n\n  public async currentAccount(): Promise<Account> {\n    // Get/refresh if necessary before we can access `accessKeyId`\n    await this.forceCredentialRetrieval();\n\n    return cached(this, CURRENT_ACCOUNT_KEY, () => SDK.accountCache.fetch(this._credentials.accessKeyId, async () => {\n      // if we don't have one, resolve from STS and store in cache.\n      debug('Looking up default account ID from STS');\n      const result = await new AWS.STS(this.config).getCallerIdentity().promise();\n      const accountId = result.Account;\n      const partition = result.Arn!.split(':')[1];\n      if (!accountId) {\n        throw new Error('STS didn\\'t return an account ID');\n      }\n      debug('Default account ID:', accountId);\n      return { accountId, partition };\n    }));\n  }\n\n  /**\n   * Return the current credentials\n   *\n   * Don't use -- only used to write tests around assuming roles.\n   */\n  public async currentCredentials(): Promise<AWS.Credentials> {\n    await this.forceCredentialRetrieval();\n    return this._credentials;\n  }\n\n  /**\n   * Force retrieval of the current credentials\n   *\n   * Relevant if the current credentials are AssumeRole credentials -- do the actual\n   * lookup, and translate any error into a useful error message (taking into\n   * account credential provenance).\n   */\n  public async forceCredentialRetrieval() {\n    try {\n      await this._credentials.getPromise();\n    } catch (e) {\n      debug(`Assuming role failed: ${e.message}`);\n      throw new Error([\n        'Could not assume role in target account',\n        ...this.sdkOptions.assumeRoleCredentialsSourceDescription\n          ? [`using ${this.sdkOptions.assumeRoleCredentialsSourceDescription}`]\n          : [],\n        e.message,\n        '. Please make sure that this role exists in the account. If it doesn\\'t exist, (re)-bootstrap the environment ' +\n        'with the right \\'--trust\\', using the latest version of the CDK CLI.',\n      ].join(' '));\n    }\n  }\n\n  /**\n   * Return a wrapping object for the underlying service object\n   *\n   * Responds to failures in the underlying service calls, in two different\n   * ways:\n   *\n   * - When errors are encountered, log the failing call and the error that\n   *   it triggered (at debug level). This is necessary because the lack of\n   *   stack traces in NodeJS otherwise makes it very hard to suss out where\n   *   a certain AWS error occurred.\n   * - The JS SDK has a funny business of wrapping any credential-based error\n   *   in a super-generic (and in our case wrong) exception. If we then use a\n   *   'ChainableTemporaryCredentials' and the target role doesn't exist,\n   *   the error message that shows up by default is super misleading\n   *   (https://github.com/aws/aws-sdk-js/issues/3272). We can fix this because\n   *   the exception contains the \"inner exception\", so we unwrap and throw\n   *   the correct error (\"cannot assume role\").\n   *\n   * The wrapping business below is slightly more complicated than you'd think\n   * because we must hook into the `promise()` method of the object that's being\n   * returned from the methods of the object that we wrap, so there's two\n   * levels of wrapping going on, and also some exceptions to the wrapping magic.\n   */\n  private wrapServiceErrorHandling<A extends object>(serviceObject: A): A {\n    const classObject = serviceObject.constructor.prototype;\n    const self = this;\n\n    return new Proxy(serviceObject, {\n      get(obj: A, prop: string) {\n        const real = (obj as any)[prop];\n        // Things we don't want to intercept:\n        // - Anything that's not a function.\n        // - 'constructor', s3.upload() will use this to do some magic and we need the underlying constructor.\n        // - Any method that's not on the service class (do not intercept 'makeRequest' and other helpers).\n        if (prop === 'constructor' || !classObject.hasOwnProperty(prop) || !isFunction(real)) { return real; }\n\n        // NOTE: This must be a function() and not an () => {\n        // because I need 'this' to be dynamically bound and not statically bound.\n        // If your linter complains don't listen to it!\n        return function(this: any) {\n          // Call the underlying function. If it returns an object with a promise()\n          // method on it, wrap that 'promise' method.\n          const args = [].slice.call(arguments, 0);\n          const response = real.apply(this, args);\n\n          // Don't intercept unless the return value is an object with a '.promise()' method.\n          if (typeof response !== 'object' || !response) { return response; }\n          if (!('promise' in response)) { return response; }\n\n          // Return an object with the promise method replaced with a wrapper which will\n          // do additional things to errors.\n          return Object.assign(Object.create(response), {\n            promise() {\n              return response.promise().catch((e: Error & { code?: string }) => {\n                e = self.makeDetailedException(e);\n                debug(`Call failed: ${prop}(${JSON.stringify(args[0])}) => ${e.message} (code=${e.code})`);\n                return Promise.reject(e); // Re-'throw' the new error\n              });\n            },\n          });\n        };\n      },\n    });\n  }\n\n  /**\n   * Extract a more detailed error out of a generic error if we can\n   *\n   * If this is an error about Assuming Roles, add in the context showing the\n   * chain of credentials we used to try to assume the role.\n   */\n  private makeDetailedException(e: Error): Error {\n    // This is the super-generic \"something's wrong\" error that the JS SDK wraps other errors in.\n    // https://github.com/aws/aws-sdk-js/blob/f0ac2e53457c7512883d0677013eacaad6cd8a19/lib/event_listeners.js#L84\n    if (typeof e.message === 'string' && e.message.startsWith('Missing credentials in config')) {\n      const original = (e as any).originalError;\n      if (original) {\n        // When the SDK does a 'util.copy', they lose the Error-ness of the inner error\n        // (they copy the Error's properties into a plain object) so make it an Error object again.\n        e = Object.assign(new Error(), original);\n      }\n    }\n\n    // At this point, the error might still be a generic \"ChainableTemporaryCredentials failed\"\n    // error which wraps the REAL error (AssumeRole failed). We're going to replace the error\n    // message with one that's more likely to help users, and tell them the most probable\n    // fix (bootstrapping). The underlying service call failure will be appended below.\n    if (e.message === 'Could not load credentials from ChainableTemporaryCredentials') {\n      e.message = [\n        'Could not assume role in target account',\n        ...this.sdkOptions.assumeRoleCredentialsSourceDescription\n          ? [`using ${this.sdkOptions.assumeRoleCredentialsSourceDescription}`]\n          : [],\n        '(did you bootstrap the environment with the right \\'--trust\\'s?)',\n      ].join(' ');\n    }\n\n    // Replace the message on this error with a concatenation of all inner error messages.\n    // Must more clear what's going on that way.\n    e.message = allChainedExceptionMessages(e);\n    return e;\n  }\n}\n\nconst CURRENT_ACCOUNT_KEY = Symbol('current_account_key');\n\nfunction isFunction(x: any): x is (...args: any[]) => any {\n  return x && {}.toString.call(x) === '[object Function]';\n}\n\n/**\n * Return the concatenated message of all exceptions in the AWS exception chain\n */\nfunction allChainedExceptionMessages(e: Error | undefined) {\n  const ret = new Array<string>();\n  while (e) {\n    ret.push(e.message);\n    e = (e as any).originalError;\n  }\n  return ret.join(': ');\n}\n"]}