aws-cloudformation-custom-resource
Version:
Helper for managing custom AWS CloudFormation resources in a Lambda function
284 lines • 39.4 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.StandardLogger = exports.LogLevel = exports.CustomResource = void 0;
const https = require("https");
/**
* Custom CloudFormation resource helper
*/
class CustomResource {
constructor(event, context, callback, createFunction, updateFunction, deleteFunction) {
/**
* Stores values returned to CloudFormation
*/
this.responseData = {};
/**
* Indicates whether to mask the output of the custom resource when it's retrieved by using the `Fn::GetAtt` function.
*
* If set to `true`, all returned values are masked with asterisks (*****), except for information stored in the locations specified below. By default, this value is `false`.
*/
this.noEcho = false;
/**
* Proxy handler for ResourceProperties
*/
this.propertiesProxyHandler = {
get: (target, propertyKey) => {
if (typeof propertyKey === 'symbol') {
return undefined; // Symbols are not supported as property keys
}
// Return another proxy for the given property key to handle value, changed, and before.
return new Proxy({ key: propertyKey }, {
get: (_, property) => {
var _a, _b;
if (property === 'value') {
return target[propertyKey];
}
if (property === 'toString' || property === 'valueOf') {
return () => target[propertyKey];
}
if (property === 'changed') {
const before = (_a = this.event.OldResourceProperties) === null || _a === void 0 ? void 0 : _a[propertyKey];
const newValue = target[propertyKey];
const changed = JSON.stringify(before) !== JSON.stringify(newValue);
return changed;
}
// When '.before' is accessed, return the old value.
if (property === 'before') {
return (_b = this.event.OldResourceProperties) === null || _b === void 0 ? void 0 : _b[propertyKey];
}
// Fallback handler for other properties on the second-level proxy.
return undefined;
},
});
},
};
this.event = event;
this.context = context;
this.callback = callback;
this.properties = new Proxy(event.ResourceProperties, this.propertiesProxyHandler);
this.createFunction = createFunction;
this.updateFunction = updateFunction;
this.deleteFunction = deleteFunction;
this.logger = new StandardLogger();
if (this.event.PhysicalResourceId) {
this.setPhysicalResourceId(this.event.PhysicalResourceId);
}
setTimeout(() => {
this.handle();
});
}
/**
* Adds values to the response returned to CloudFormation
*/
addResponseValue(key, value) {
this.responseData[key] = value;
}
/**
* Set the physical ID of the resource
*/
setPhysicalResourceId(value) {
this.physicalResourceId = value;
}
/**
* Get the physical ID of the resource
*/
getPhysicalResourceId() {
return this.physicalResourceId;
}
/**
* Set whether to mask the output of the custom resource when it's retrieved by using the `Fn::GetAtt` function.
*
* If set to `true`, all returned values are masked with asterisks (*****), except for information stored in the locations specified below. By default, this value is `false`.
*/
setNoEcho(value) {
this.noEcho = value;
}
/**
* Get whether to mask the output of the custom resource when it's retrieved by using the `Fn::GetAtt` function.
*/
getNoEcho() {
return this.noEcho;
}
/**
* Set the logger class
*/
setLogger(logger) {
this.logger = logger;
}
/**
* Handles the Lambda event
*/
handle() {
if (typeof this.event.ResponseURL === 'undefined') {
throw new Error('ResponseURL missing');
}
this.logger.info('REQUEST RECEIVED:', JSON.stringify(this.event));
this.timeout();
try {
let handlerFunction;
switch (this.event.RequestType // Changed to switch for better readability
) {
case 'Create':
handlerFunction = this.createFunction;
break;
case 'Update':
handlerFunction = this.updateFunction;
break;
case 'Delete':
handlerFunction = this.deleteFunction;
break;
default:
this.sendResponse('FAILED',
// eslint-disable-next-line @typescript-eslint/restrict-template-expressions
`Unexpected request type: ${this.event.RequestType}`);
return;
}
handlerFunction(this, this.logger)
.then(() => {
this.sendResponse('SUCCESS', `${this.event.RequestType} completed successfully`);
})
.catch((err) => {
this.handleError(err);
});
}
catch (err) {
this.handleError(err);
}
}
handleError(err) {
console.log(err);
this.logger.error(JSON.stringify(err, null, 2));
let errorMessage;
if (err instanceof Error) {
errorMessage = err.message;
}
else if (typeof err === 'string') {
errorMessage = err;
}
else {
errorMessage = `Unknown error: ${JSON.stringify(err)}`;
}
this.sendResponse('FAILED', errorMessage);
}
/**
* Sends CloudFormation response just before the Lambda times out
*/
timeout() {
const handler = () => {
this.logger.error('Timeout FAILURE!');
new Promise(() => this.sendResponse('FAILED', 'Function timed out'))
.then(() => this.callback(new Error('Function timed out')))
.catch((err) => {
this.handleError(err);
});
};
this.timeoutTimer = setTimeout(handler, this.context.getRemainingTimeInMillis() - 1000);
}
/**
* Sends CloudFormation response
*/
sendResponse(responseStatus, responseData) {
var _a, _b;
this.logger.debug(`Clearing timeout timer, as we're about to send a response...`);
clearTimeout(this.timeoutTimer);
this.logger.debug(`Sending response ${responseStatus}:`, JSON.stringify(responseData, null, 2));
const body = {
/* eslint-disable @typescript-eslint/naming-convention */
Status: responseStatus,
Reason: `${responseData} | ${responseStatus === 'FAILED' ? 'Full error' : 'Details'} in CloudWatch ${this.context.logStreamName}`,
PhysicalResourceId: (_b = (_a = this.physicalResourceId) !== null && _a !== void 0 ? _a : this.event.ResourceProperties.name) !== null && _b !== void 0 ? _b : this.context.logStreamName,
StackId: this.event.StackId,
RequestId: this.event.RequestId,
LogicalResourceId: this.event.LogicalResourceId,
Data: this.responseData,
NoEcho: this.noEcho,
/* eslint-enable @typescript-eslint/naming-convention */
};
const bodyString = JSON.stringify(body);
const url = new URL(this.event.ResponseURL);
const options = {
hostname: url.hostname,
port: 443,
path: `${url.pathname}${url.search}`,
method: 'PUT',
headers: {
/* eslint-disable @typescript-eslint/naming-convention */
'content-type': '',
'content-length': bodyString.length,
/* eslint-enable @typescript-eslint/naming-convention */
},
};
this.logger.info('SENDING RESPONSE...', JSON.stringify({ options, body }, null, 2));
const request = https.request(options, (response) => {
this.logger.debug('RESULT:', {
status: response.statusCode,
headers: response.headers,
});
this.callback(null, 'done');
});
request.on('error', (error) => {
this.logger.error('sendResponse Error:', JSON.stringify(error));
this.callback(error);
});
request.write(bodyString);
request.end();
}
}
exports.CustomResource = CustomResource;
/**
* LogLevels supported by the logger
*/
var LogLevel;
(function (LogLevel) {
LogLevel[LogLevel["error"] = 0] = "error";
LogLevel[LogLevel["warn"] = 1] = "warn";
LogLevel[LogLevel["info"] = 2] = "info";
LogLevel[LogLevel["debug"] = 3] = "debug";
})(LogLevel || (exports.LogLevel = LogLevel = {}));
/**
* Standard logger class
*/
class StandardLogger {
constructor(level) {
this.level = level !== null && level !== void 0 ? level : LogLevel.warn;
}
/**
* Logs message with level ERROR
*/
error(message, ...optionalParams) {
if (this.level < LogLevel.error)
return;
console.error(message, ...optionalParams);
}
/**
* Logs message with level WARN
*/
warn(message, ...optionalParams) {
if (this.level < LogLevel.warn)
return;
console.warn(message, ...optionalParams);
}
/**
* Logs message with level INFO
*/
info(message, ...optionalParams) {
if (this.level < LogLevel.info)
return;
console.info(message, ...optionalParams);
}
/**
* Logs message with level DEBUG
*/
debug(message, ...optionalParams) {
if (this.level < LogLevel.debug)
return;
console.debug(message, ...optionalParams);
}
/**
* Alias for info
*/
log(message, ...optionalParams) {
this.info(message, ...optionalParams);
}
}
exports.StandardLogger = StandardLogger;
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https = require('https');\n\nexport type Callback<TResult = unknown> = (\n  error?: Error | string | null,\n  result?: TResult,\n) => void;\n\nexport interface Context {\n  callbackWaitsForEmptyEventLoop: boolean;\n  functionName: string;\n  functionVersion: string;\n  invokedFunctionArn: string;\n  memoryLimitInMB: string;\n  awsRequestId: string;\n  logGroupName: string;\n  logStreamName: string;\n  getRemainingTimeInMillis(): number;\n}\n\n/**\n * Default resource properties, if user does not provide any via generic\n */\ntype DefaultResourceProperties = Record<string, string>;\n\ninterface ResourceProperty<T> {\n  /**\n   * The value of the property\n   */\n  value: T;\n\n  /**\n   * The value of the property before the update\n   *\n   * Only available during a resource update\n   */\n  before?: T;\n\n  /**\n   * Indicates whether the value of the property has changed\n   */\n  changed: boolean;\n\n  /**\n   * Returns the value of the property\n   * @returns The value of the property\n   */\n  toString(): string;\n\n  /**\n   * Returns the value of the property\n   * @returns The value of the property\n   */\n  valueOf(): string;\n}\n\ntype CustomResourceProperties<ResourceProperties extends object> = {\n  [P in keyof ResourceProperties]: ResourceProperty<ResourceProperties[P]>;\n};\n\n/**\n * The event passed to the Lambda handler\n */\nexport type Event<ResourceProperties = DefaultResourceProperties> = Omit<\n  Record<string, unknown>,\n  'ResourceProperties'\n> & {\n  /* eslint-disable @typescript-eslint/naming-convention */\n  PhysicalResourceId?: string;\n  StackId: string;\n  RequestId: string;\n  LogicalResourceId: string;\n  ResponseURL?: string;\n  RequestType: 'Create' | 'Update' | 'Delete';\n  ResourceProperties: ResourceProperties;\n  OldResourceProperties?: ResourceProperties;\n  /* eslint-enable @typescript-eslint/naming-convention */\n};\n\n/**\n * A response value returned to CloudFormation.\n */\n// As Cloudformation will transform any value to a string, we're upfront explicit and only allow strings to avoid surprises\n// Technically it would be possible though, to accept booleans and numbers as well.\ntype ResponseValue = string;\n\n/**\n * Function signature\n */\nexport type HandlerFunction<ResourceProperties extends object> = (\n  resource: CustomResource<ResourceProperties>,\n  logger: Logger,\n) => Promise<void>;\n\n/**\n * Custom CloudFormation resource helper\n */\nexport class CustomResource<\n  ResourceProperties extends object = DefaultResourceProperties,\n> {\n  /**\n   * Stores function executed when resource creation is requested\n   */\n  private createFunction: HandlerFunction<ResourceProperties>;\n\n  /**\n   * Stores function executed when resource update is requested\n   */\n  private updateFunction: HandlerFunction<ResourceProperties>;\n\n  /**\n   * Stores function executed when resource deletion is requested\n   */\n  private deleteFunction: HandlerFunction<ResourceProperties>;\n\n  /**\n   * The event passed to the Lambda handler\n   */\n  public readonly event: Event<ResourceProperties>;\n\n  /**\n   * The context passed to the Lambda handler\n   */\n  public readonly context: Context;\n\n  /**\n   * The callback function passed to the Lambda handler\n   */\n  public readonly callback: Callback;\n\n  /**\n   * The properties passed to the Lambda function\n   */\n  public readonly properties: CustomResourceProperties<ResourceProperties>;\n\n  /**\n   * Stores values returned to CloudFormation\n   */\n  private responseData: Record<string, ResponseValue> = {};\n\n  /**\n   * Stores values physical ID of the resource\n   */\n  private physicalResourceId?: string;\n\n  /**\n   * Indicates whether to mask the output of the custom resource when it's retrieved by using the `Fn::GetAtt` function.\n   *\n   * If set to `true`, all returned values are masked with asterisks (*****), except for information stored in the locations specified below. By default, this value is `false`.\n   */\n  private noEcho = false;\n\n  /**\n   * Logger class\n   */\n  private logger: Logger;\n\n  /**\n   * Timer for the Lambda timeout\n   *\n   * One second before the Lambda times out, we send a FAILED response to CloudFormation.\n   * We store the timer, so we can clear it when we send the response.\n   */\n  private timeoutTimer?: NodeJS.Timeout;\n\n  constructor(\n    event: Event<ResourceProperties>,\n    context: Context,\n    callback: Callback,\n    createFunction: HandlerFunction<ResourceProperties>,\n    updateFunction: HandlerFunction<ResourceProperties>,\n    deleteFunction: HandlerFunction<ResourceProperties>,\n  ) {\n    this.event = event;\n    this.context = context;\n    this.callback = callback;\n    this.properties = new Proxy(\n      event.ResourceProperties as CustomResourceProperties<ResourceProperties>,\n      this.propertiesProxyHandler,\n    );\n    this.createFunction = createFunction;\n    this.updateFunction = updateFunction;\n    this.deleteFunction = deleteFunction;\n    this.logger = new StandardLogger();\n    if (this.event.PhysicalResourceId) {\n      this.setPhysicalResourceId(this.event.PhysicalResourceId);\n    }\n    setTimeout(() => {\n      this.handle();\n    });\n  }\n\n  /**\n   * Proxy handler for ResourceProperties\n   */\n  private propertiesProxyHandler: ProxyHandler<\n    CustomResourceProperties<ResourceProperties>\n  > = {\n    get: (\n      target: CustomResourceProperties<ResourceProperties>,\n      propertyKey: string | symbol,\n    ) => {\n      if (typeof propertyKey === 'symbol') {\n        return undefined; // Symbols are not supported as property keys\n      }\n\n      // Return another proxy for the given property key to handle value, changed, and before.\n      return new Proxy(\n        { key: propertyKey },\n        {\n          get: (_, property: string | symbol) => {\n            if (property === 'value') {\n              return target[propertyKey as keyof ResourceProperties];\n            }\n\n            if (property === 'toString' || property === 'valueOf') {\n              return () => target[propertyKey as keyof ResourceProperties];\n            }\n\n            if (property === 'changed') {\n              const before =\n                this.event.OldResourceProperties?.[\n                  propertyKey as keyof ResourceProperties\n                ];\n              const newValue = target[propertyKey as keyof ResourceProperties];\n              const changed =\n                JSON.stringify(before) !== JSON.stringify(newValue);\n              return changed;\n            }\n\n            // When '.before' is accessed, return the old value.\n            if (property === 'before') {\n              return this.event.OldResourceProperties?.[\n                propertyKey as keyof ResourceProperties\n              ];\n            }\n\n            // Fallback handler for other properties on the second-level proxy.\n            return undefined;\n          },\n        },\n      );\n    },\n  };\n\n  /**\n   * Adds values to the response returned to CloudFormation\n   */\n  addResponseValue(key: string, value: ResponseValue) {\n    this.responseData[key] = value;\n  }\n\n  /**\n   * Set the physical ID of the resource\n   */\n  setPhysicalResourceId(value: string) {\n    this.physicalResourceId = value;\n  }\n\n  /**\n   * Get the physical ID of the resource\n   */\n  getPhysicalResourceId() {\n    return this.physicalResourceId;\n  }\n\n  /**\n   * Set whether to mask the output of the custom resource when it's retrieved by using the `Fn::GetAtt` function.\n   *\n   * If set to `true`, all returned values are masked with asterisks (*****), except for information stored in the locations specified below. By default, this value is `false`.\n   */\n  setNoEcho(value: boolean) {\n    this.noEcho = value;\n  }\n\n  /**\n   * Get whether to mask the output of the custom resource when it's retrieved by using the `Fn::GetAtt` function.\n   */\n  getNoEcho() {\n    return this.noEcho;\n  }\n\n  /**\n   * Set the logger class\n   */\n  setLogger(logger: Logger) {\n    this.logger = logger;\n  }\n\n  /**\n   * Handles the Lambda event\n   */\n  private handle() {\n    if (typeof this.event.ResponseURL === 'undefined') {\n      throw new Error('ResponseURL missing');\n    }\n\n    this.logger.info('REQUEST RECEIVED:', JSON.stringify(this.event));\n    this.timeout();\n\n    try {\n      let handlerFunction: HandlerFunction<ResourceProperties>;\n      switch (\n        this.event.RequestType // Changed to switch for better readability\n      ) {\n        case 'Create':\n          handlerFunction = this.createFunction;\n          break;\n        case 'Update':\n          handlerFunction = this.updateFunction;\n          break;\n        case 'Delete':\n          handlerFunction = this.deleteFunction;\n          break;\n        default:\n          this.sendResponse(\n            'FAILED',\n            // eslint-disable-next-line @typescript-eslint/restrict-template-expressions\n            `Unexpected request type: ${this.event.RequestType}`,\n          );\n          return;\n      }\n\n      handlerFunction(this, this.logger)\n        .then(() => {\n          this.sendResponse(\n            'SUCCESS',\n            `${this.event.RequestType} completed successfully`,\n          );\n        })\n        .catch((err: unknown) => {\n          this.handleError(err);\n        });\n    } catch (err) {\n      this.handleError(err);\n    }\n  }\n\n  private handleError(err: unknown) {\n    console.log(err);\n    this.logger.error(JSON.stringify(err, null, 2));\n\n    let errorMessage: string;\n    if (err instanceof Error) {\n      errorMessage = err.message;\n    } else if (typeof err === 'string') {\n      errorMessage = err;\n    } else {\n      errorMessage = `Unknown error: ${JSON.stringify(err)}`;\n    }\n\n    this.sendResponse('FAILED', errorMessage);\n  }\n\n  /**\n   * Sends CloudFormation response just before the Lambda times out\n   */\n  private timeout() {\n    const handler = () => {\n      this.logger.error('Timeout FAILURE!');\n      new Promise(() => this.sendResponse('FAILED', 'Function timed out'))\n        .then(() => this.callback(new Error('Function timed out')))\n        .catch((err: unknown) => {\n          this.handleError(err);\n        });\n    };\n    this.timeoutTimer = setTimeout(\n      handler,\n      this.context.getRemainingTimeInMillis() - 1000,\n    );\n  }\n\n  /**\n   * Sends CloudFormation response\n   */\n  private sendResponse(\n    responseStatus: 'SUCCESS' | 'FAILED',\n    responseData: string,\n  ) {\n    this.logger.debug(\n      `Clearing timeout timer, as we're about to send a response...`,\n    );\n    clearTimeout(this.timeoutTimer);\n\n    this.logger.debug(\n      `Sending response ${responseStatus}:`,\n      JSON.stringify(responseData, null, 2),\n    );\n\n    const body = {\n      /* eslint-disable @typescript-eslint/naming-convention */\n      Status: responseStatus,\n      Reason: `${responseData} | ${responseStatus === 'FAILED' ? 'Full error' : 'Details'} in CloudWatch ${this.context.logStreamName}`,\n      PhysicalResourceId:\n        this.physicalResourceId ??\n        (this.event.ResourceProperties as DefaultResourceProperties).name ??\n        this.context.logStreamName,\n      StackId: this.event.StackId,\n      RequestId: this.event.RequestId,\n      LogicalResourceId: this.event.LogicalResourceId,\n      Data: this.responseData,\n      NoEcho: this.noEcho,\n      /* eslint-enable @typescript-eslint/naming-convention */\n    };\n\n    const bodyString = JSON.stringify(body);\n\n    const url = new URL(this.event.ResponseURL!);\n\n    const options = {\n      hostname: url.hostname,\n      port: 443,\n      path: `${url.pathname}${url.search}`,\n      method: 'PUT',\n      headers: {\n        /* eslint-disable @typescript-eslint/naming-convention */\n        'content-type': '',\n        'content-length': bodyString.length,\n        /* eslint-enable @typescript-eslint/naming-convention */\n      },\n    };\n\n    this.logger.info(\n      'SENDING RESPONSE...',\n      JSON.stringify({ options, body }, null, 2),\n    );\n\n    const request = https.request(options, (response) => {\n      this.logger.debug('RESULT:', {\n        status: response.statusCode,\n        headers: response.headers,\n      });\n      this.callback(null, 'done');\n    });\n\n    request.on('error', (error) => {\n      this.logger.error('sendResponse Error:', JSON.stringify(error));\n      this.callback(error);\n    });\n\n    request.write(bodyString);\n    request.end();\n  }\n}\n\n/**\n * Logger class\n */\nexport interface Logger {\n  log(message: unknown, ...optionalParams: unknown[]): void;\n  info(message: unknown, ...optionalParams: unknown[]): void;\n  debug(message: unknown, ...optionalParams: unknown[]): void;\n  warn(message: unknown, ...optionalParams: unknown[]): void;\n  error(message: unknown, ...optionalParams: unknown[]): void;\n}\n\n/**\n * LogLevels supported by the logger\n */\nexport enum LogLevel {\n  error,\n  warn,\n  info,\n  debug,\n}\n\n/**\n * Standard logger class\n */\nexport class StandardLogger {\n  /**\n   * The log level\n   *\n   * @default LogLevel.warn\n   */\n  level: LogLevel;\n\n  constructor(level?: LogLevel) {\n    this.level = level ?? LogLevel.warn;\n  }\n  /**\n   * Logs message with level ERROR\n   */\n  error(message: unknown, ...optionalParams: unknown[]) {\n    if (this.level < LogLevel.error) return;\n    console.error(message, ...optionalParams);\n  }\n\n  /**\n   * Logs message with level WARN\n   */\n  warn(message: unknown, ...optionalParams: unknown[]) {\n    if (this.level < LogLevel.warn) return;\n    console.warn(message, ...optionalParams);\n  }\n\n  /**\n   * Logs message with level INFO\n   */\n  info(message: unknown, ...optionalParams: unknown[]) {\n    if (this.level < LogLevel.info) return;\n    console.info(message, ...optionalParams);\n  }\n\n  /**\n   * Logs message with level DEBUG\n   */\n  debug(message: unknown, ...optionalParams: unknown[]) {\n    if (this.level < LogLevel.debug) return;\n    console.debug(message, ...optionalParams);\n  }\n\n  /**\n   * Alias for info\n   */\n  log(message: unknown, ...optionalParams: unknown[]) {\n    this.info(message, ...optionalParams);\n  }\n}\n"]}