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image-scanner-with-trivy

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Scan container images with Trivy in CDK deployment

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"use strict"; var _a, _b; Object.defineProperty(exports, "__esModule", { value: true }); exports.ImageScannerWithTrivy = exports.ScanLogsOutput = exports.ImageConfigScanners = exports.Scanners = exports.Severity = void 0; const JSII_RTTI_SYMBOL_1 = Symbol.for("jsii.rtti"); const path_1 = require("path"); const aws_cdk_lib_1 = require("aws-cdk-lib"); const aws_ecr_assets_1 = require("aws-cdk-lib/aws-ecr-assets"); const aws_lambda_1 = require("aws-cdk-lib/aws-lambda"); const aws_logs_1 = require("aws-cdk-lib/aws-logs"); const custom_resources_1 = require("aws-cdk-lib/custom-resources"); const constructs_1 = require("constructs"); const types_1 = require("./types"); /** * Enum for Severity Selection * * @see https://aquasecurity.github.io/trivy/latest/docs/scanner/vulnerability/#severity-selection */ var Severity; (function (Severity) { Severity["UNKNOWN"] = "UNKNOWN"; Severity["LOW"] = "LOW"; Severity["MEDIUM"] = "MEDIUM"; Severity["HIGH"] = "HIGH"; Severity["CRITICAL"] = "CRITICAL"; })(Severity || (exports.Severity = Severity = {})); /** * Enum for Scanners * * @see https://aquasecurity.github.io/trivy/latest/docs/configuration/others/#enabledisable-scanners */ var Scanners; (function (Scanners) { Scanners["VULN"] = "vuln"; Scanners["CONFIG"] = "config"; Scanners["SECRET"] = "secret"; Scanners["LICENSE"] = "license"; })(Scanners || (exports.Scanners = Scanners = {})); /** * Enum for ImageConfigScanners * * @see https://aquasecurity.github.io/trivy/latest/docs/target/container_image/#container-image-metadata */ var ImageConfigScanners; (function (ImageConfigScanners) { ImageConfigScanners["CONFIG"] = "config"; ImageConfigScanners["SECRET"] = "secret"; })(ImageConfigScanners || (exports.ImageConfigScanners = ImageConfigScanners = {})); /** * Represents the output of the scan logs. */ class ScanLogsOutput { /** * Scan logs output to CloudWatch Logs log group. */ static cloudWatchLogs(options) { return new CloudWatchLogsOutput(options); } } exports.ScanLogsOutput = ScanLogsOutput; _a = JSII_RTTI_SYMBOL_1; ScanLogsOutput[_a] = { fqn: "image-scanner-with-trivy.ScanLogsOutput", version: "2.0.0" }; class CloudWatchLogsOutput extends ScanLogsOutput { constructor(options) { super(); this.logGroup = options.logGroup; } bind(grantee) { // Most Lambdas are granted AWSLambdaBasicExecutionRole and can write to any CloudWatch Logs. // However, just in case AWSLambdaBasicExecutionRole is not granted, allow writing to CloudWatch Logs. this.logGroup.grantWrite(grantee); return { type: types_1.ScanLogsOutputType.CLOUDWATCH_LOGS, logGroupName: this.logGroup.logGroupName, }; } } // Maximum Lambda memory size for default AWS account without quota limit increase const DEFAULT_MEMORY_SIZE = 3008; class ImageScannerWithTrivy extends constructs_1.Construct { constructor(scope, id, props) { super(scope, id); if (props.memorySize && !aws_cdk_lib_1.Token.isUnresolved(props.memorySize) && (props.memorySize < 3008 || props.memorySize > 10240)) { throw new Error(`You can specify between \`3008\` and \`10240\` for \`memorySize\`, got ${props.memorySize}.`); } const lambdaPurpose = 'Custom::ImageScannerWithTrivyCustomResourceLambda'; const customResourceLambda = new aws_lambda_1.SingletonFunction(this, 'CustomResourceLambda', { uuid: '470b6343-d267-f753-226c-1e99f09f319a', lambdaPurpose, runtime: aws_lambda_1.Runtime.FROM_IMAGE, handler: aws_lambda_1.Handler.FROM_IMAGE, code: aws_lambda_1.AssetCode.fromAssetImage((0, path_1.join)(__dirname, '../assets/lambda'), { platform: aws_ecr_assets_1.Platform.LINUX_ARM64, // exclude node_modules // because the native binary of the installed esbuild changes depending on the cpu architecture // and the hash value of the image asset changes depending on the execution environment. exclude: ['node_modules'], }), architecture: aws_lambda_1.Architecture.ARM_64, timeout: aws_cdk_lib_1.Duration.seconds(900), retryAttempts: 0, memorySize: props.memorySize ?? DEFAULT_MEMORY_SIZE, ephemeralStorageSize: aws_cdk_lib_1.Size.gibibytes(10), // for cases that need to update trivy DB: /tmp/trivy/db/trivy.db }); props.repository.grantPull(customResourceLambda); const customResourceLambdaLogGroupConstructName = `DefaultLogGroupFor${lambdaPurpose}`; this.validateLambdaDefaultLogGroupOptions(customResourceLambdaLogGroupConstructName, props); if (props.defaultLogGroupRemovalPolicy || props.defaultLogGroupRetentionDays) { this.ensureLambdaDefaultLogGroup(customResourceLambda, customResourceLambdaLogGroupConstructName, props); } const imageScannerProvider = new custom_resources_1.Provider(this, 'Provider', { onEventHandler: customResourceLambda, }); const imageScannerProperties = { addr: this.node.addr, imageUri: props.imageUri, ignoreUnfixed: String(props.ignoreUnfixed ?? false), severity: props.severity ?? [Severity.CRITICAL], scanners: props.scanners ?? [], imageConfigScanners: props.imageConfigScanners ?? [], exitCode: props.exitCode ?? 1, exitOnEol: props.exitOnEol ?? 1, trivyIgnore: props.trivyIgnore ?? [], platform: props.platform ?? '', output: props.scanLogsOutput?.bind(customResourceLambda), }; new aws_cdk_lib_1.CustomResource(this, 'Resource', { resourceType: 'Custom::ImageScannerWithTrivy', properties: imageScannerProperties, serviceToken: imageScannerProvider.serviceToken, }); } /** * Validates that specified default log group options are the same for existing default log group. */ validateLambdaDefaultLogGroupOptions(logGroupConstructName, props) { const existing = aws_cdk_lib_1.Stack.of(this).node.tryFindChild(logGroupConstructName); if (!existing) return; const cfnLogGroup = existing.node.defaultChild; if (!this.isSameResourceDeletionBehavior(props.defaultLogGroupRemovalPolicy, cfnLogGroup.cfnOptions.deletionPolicy) || cfnLogGroup.retentionInDays !== props.defaultLogGroupRetentionDays) { aws_cdk_lib_1.Annotations.of(this).addWarningV2('@image-scanner-with-trivy:duplicateLambdaDefaultLogGroupOptions', "You have to set the same values for 'defaultLogGroupRemovalPolicy' and 'defaultLogGroupRetentionDays' for each ImageScannerWithTrivy construct in the same stack."); } } /** * Creates the default log group for Scanner Lambda if it does not exist. * * This method checks if the default log group for Scanner Lambda exists in children of the stack construct. * If it does not exist, it creates the default log group for Scanner Lambda as a child of the stack construct. */ ensureLambdaDefaultLogGroup(singletonFunction, logGroupConstructName, props) { const existing = aws_cdk_lib_1.Stack.of(this).node.tryFindChild(logGroupConstructName); if (existing) { return existing; } return new aws_logs_1.LogGroup(aws_cdk_lib_1.Stack.of(this), logGroupConstructName, { logGroupName: `/aws/lambda/${singletonFunction.functionName}`, retention: props.defaultLogGroupRetentionDays, removalPolicy: props.defaultLogGroupRemovalPolicy, }); } isSameResourceDeletionBehavior(removalPolicy, deletionPolicy) { switch (removalPolicy) { case aws_cdk_lib_1.RemovalPolicy.DESTROY: return deletionPolicy === aws_cdk_lib_1.CfnDeletionPolicy.DELETE; case aws_cdk_lib_1.RemovalPolicy.RETAIN: return deletionPolicy === aws_cdk_lib_1.CfnDeletionPolicy.RETAIN; case aws_cdk_lib_1.RemovalPolicy.SNAPSHOT: return deletionPolicy === aws_cdk_lib_1.CfnDeletionPolicy.SNAPSHOT; case aws_cdk_lib_1.RemovalPolicy.RETAIN_ON_UPDATE_OR_DELETE: return deletionPolicy === aws_cdk_lib_1.CfnDeletionPolicy.RETAIN_EXCEPT_ON_CREATE; case undefined: return deletionPolicy === undefined; default: return removalPolicy; } } } exports.ImageScannerWithTrivy = ImageScannerWithTrivy; _b = JSII_RTTI_SYMBOL_1; ImageScannerWithTrivy[_b] = { fqn: "image-scanner-with-trivy.ImageScannerWithTrivy", version: "2.0.0" }; //# 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{ join } from 'path';\nimport {\n  Annotations,\n  CfnDeletionPolicy,\n  CustomResource,\n  Duration,\n  RemovalPolicy,\n  Size,\n  Stack,\n  Token,\n} from 'aws-cdk-lib';\nimport { IRepository } from 'aws-cdk-lib/aws-ecr';\nimport { Platform } from 'aws-cdk-lib/aws-ecr-assets';\nimport { IGrantable } from 'aws-cdk-lib/aws-iam';\nimport {\n  Architecture,\n  AssetCode,\n  Handler,\n  Runtime,\n  SingletonFunction,\n} from 'aws-cdk-lib/aws-lambda';\nimport { CfnLogGroup, ILogGroup, LogGroup, RetentionDays } from 'aws-cdk-lib/aws-logs';\nimport { Provider } from 'aws-cdk-lib/custom-resources';\nimport { Construct } from 'constructs';\nimport {\n  CloudWatchLogsOutputOptions,\n  ScanLogsOutputOptions,\n  ScanLogsOutputType,\n  ScannerCustomResourceProps,\n} from './types';\n\n/**\n * Enum for Severity Selection\n *\n * @see https://aquasecurity.github.io/trivy/latest/docs/scanner/vulnerability/#severity-selection\n */\nexport enum Severity {\n  UNKNOWN = 'UNKNOWN',\n  LOW = 'LOW',\n  MEDIUM = 'MEDIUM',\n  HIGH = 'HIGH',\n  CRITICAL = 'CRITICAL',\n}\n\n/**\n * Enum for Scanners\n *\n * @see https://aquasecurity.github.io/trivy/latest/docs/configuration/others/#enabledisable-scanners\n */\nexport enum Scanners {\n  VULN = 'vuln',\n  CONFIG = 'config',\n  SECRET = 'secret',\n  LICENSE = 'license',\n}\n\n/**\n * Enum for ImageConfigScanners\n *\n * @see https://aquasecurity.github.io/trivy/latest/docs/target/container_image/#container-image-metadata\n */\nexport enum ImageConfigScanners {\n  CONFIG = 'config',\n  SECRET = 'secret',\n}\n\n/**\n * Configuration for scan logs output to CloudWatch Logs log group.\n */\nexport interface CloudWatchLogsOutputProps {\n  /**\n   * The log group to output scan logs.\n   */\n  readonly logGroup: ILogGroup;\n}\n\n/**\n * Represents the output of the scan logs.\n */\nexport abstract class ScanLogsOutput {\n  /**\n   * Scan logs output to CloudWatch Logs log group.\n   */\n  public static cloudWatchLogs(options: CloudWatchLogsOutputProps): ScanLogsOutput {\n    return new CloudWatchLogsOutput(options);\n  }\n\n  /**\n   * Returns the output configuration for scan logs.\n   */\n  public abstract bind(grantee: IGrantable): ScanLogsOutputOptions;\n}\n\nclass CloudWatchLogsOutput extends ScanLogsOutput {\n  /**\n   * The log group to output scan logs.\n   */\n  private readonly logGroup: ILogGroup;\n\n  constructor(options: CloudWatchLogsOutputProps) {\n    super();\n\n    this.logGroup = options.logGroup;\n  }\n\n  public bind(grantee: IGrantable): CloudWatchLogsOutputOptions {\n    // Most Lambdas are granted AWSLambdaBasicExecutionRole and can write to any CloudWatch Logs.\n    // However, just in case AWSLambdaBasicExecutionRole is not granted, allow writing to CloudWatch Logs.\n    this.logGroup.grantWrite(grantee);\n\n    return {\n      type: ScanLogsOutputType.CLOUDWATCH_LOGS,\n      logGroupName: this.logGroup.logGroupName,\n    };\n  }\n}\n\nexport interface ImageScannerWithTrivyProps {\n  /**\n   * Image URI for scan target.\n   */\n  readonly imageUri: string;\n\n  /**\n   * Repository including the image URI for scan target.\n   *\n   * Because of grantPull to CustomResourceLambda.\n   */\n  readonly repository: IRepository;\n\n  /**\n   * The unfixed/unfixable vulnerabilities mean that the patch has not yet been provided on their distribution.\n   *\n   * To hide unfixed/unfixable vulnerabilities, you can use the `--ignore-unfixed` flag.\n   *\n   * @default false\n   *\n   * @see https://aquasecurity.github.io/trivy/latest/docs/scanner/vulnerability/#unfixed-vulnerabilities\n   */\n  readonly ignoreUnfixed?: boolean;\n\n  /**\n   * Severity Selection\n   *\n   * The severity is taken from the selected data source since the severity from vendors is more accurate.\n   * Using CVE-2023-0464 as an example, while it is rated as \"HIGH\" in NVD, Red Hat has marked its 'Impact' as \"Low\". As a result, Trivy will display it as \"Low\".\n   *\n   * The severity depends on the compile option, the default configuration, etc. NVD doesn't know how the vendor distributes the software.\n   * Red Hat evaluates the severity more accurately. That's why Trivy prefers vendor scores over NVD.\n   *\n   * It defaults to `CRITICAL` IN THIS CONSTRUCT for safety in CI/CD, but the default configuration of Trivy is \"CRITICAL,HIGH,MEDIUM,LOW,UNKNOWN\".\n   *\n   * @default [Severity.CRITICAL]\n   *\n   * @see https://aquasecurity.github.io/trivy/latest/docs/scanner/vulnerability/#severity-selection\n   */\n  readonly severity?: Severity[];\n\n  /**\n   * Enable/Disable Scanners\n   *\n   * You can enable/disable scanners with the `scanners`.\n   *\n   * For example, container image scanning enables vulnerability (VULN) and secret scanners (SECRET) by default.\n   * If you don't need secret scanning, it can be disabled by specifying Scanners.VULN only.\n   *\n   * @default [Security.VULN,Scanners.SECRET]\n   *\n   * @see https://aquasecurity.github.io/trivy/latest/docs/configuration/others/#enabledisable-scanners\n   */\n  readonly scanners?: Scanners[];\n\n  /**\n   * Enum for ImageConfigScanners\n   *\n   * Container images have configuration. docker inspect and `docker history` show the information according to the configuration.\n   * Trivy scans the configuration of container images for\n   *\n   * - Misconfigurations\n   * - Secrets\n   *\n   * They are disabled by default. You can enable them with `imageConfigScanners`.\n   *\n   * @default []\n   *\n   * @see https://aquasecurity.github.io/trivy/latest/docs/target/container_image/#container-image-metadata\n   */\n  readonly imageConfigScanners?: ImageConfigScanners[];\n\n  /**\n   * Exit Code\n   *\n   * Use the `exitCode` option if you want to exit with a non-zero exit code.\n   *\n   * You can specify 0 if you do not want to exit even when vulnerabilities are detected.\n   *\n   * It defaults to 1 IN THIS CONSTRUCT for safety in CI/CD. In the original trivy, it is 0.\n   *\n   * @default 1\n   *\n   * @see https://aquasecurity.github.io/trivy/latest/docs/configuration/others/#exit-code\n   */\n  readonly exitCode?: number;\n\n  /**\n   * Exit on EOL\n   *\n   * Sometimes you may surprisingly get 0 vulnerabilities in an old image:\n   *  - Enabling --ignore-unfixed option while all packages have no fixed versions.\n   *  - Scanning a rather outdated OS (e.g. Ubuntu 10.04).\n   *\n   * An OS at the end of service/life (EOL) usually gets into this situation, which is definitely full of vulnerabilities.\n   * `exitOnEol` can fail scanning on EOL OS with a non-zero code.\n   *\n   * It defaults to 1 IN THIS CONSTRUCT for safety in CI/CD. In the original trivy, it is 0.\n   *\n   * @default 1\n   *\n   * @see https://aquasecurity.github.io/trivy/latest/docs/configuration/others/#exit-on-eol\n   */\n  readonly exitOnEol?: number;\n\n  /**\n   * By Finding IDs\n   *\n   * The ignore rules written to the .trivyignore in trivy.\n   * Put each line you write in the file into one element of the array.\n   *\n   * @example\n   *     $ cat .trivyignore\n   *     # Accept the risk\n   *     CVE-2018-14618\n   *\n   *     # Accept the risk until 2023-01-01\n   *     CVE-2019-14697 exp:2023-01-01\n   *\n   *     # No impact in our settings\n   *     CVE-2019-1543\n   *\n   *     # Ignore misconfigurations\n   *     AVD-DS-0002\n   *\n   *     # Ignore secrets\n   *     generic-unwanted-rule\n   *     aws-account-id\n   *\n   * @default []\n   *\n   * @see https://aquasecurity.github.io/trivy/latest/docs/configuration/filtering/#trivyignore\n   */\n  readonly trivyIgnore?: string[];\n\n  /**\n   * Memory Size (MB) for Scanner Lambda\n   *\n   * You can specify between `3008` and `10240`.\n   *\n   * If this Construct execution terminates abnormally due to SIGKILL, try a larger size.\n   *\n   * Default value (`3008` MB) is Maximum Lambda memory size for default AWS account without quota limit increase.\n   *\n   * @default 3008\n   */\n  readonly memorySize?: number;\n\n  /**\n   * Scan Image on a specific Architecture and OS\n   *\n   * By default, Trivy loads an image on a `linux/amd64` machine.\n   *\n   * To customize this, pass a `platform` argument in the format OS/Architecture for the image, such as `linux/arm64`\n   *\n   * @default -\n   */\n  readonly platform?: string;\n\n  /**\n   * The removal policy to apply to Scanner Lambda's default log group\n   *\n   * If you use ImageScannerWithTrivy construct multiple times in the same stack, you cannot set different removal policies for the default log group.\n   * See `Notes` section in the README for more details.\n   *\n   * @default - Scanner Lambda creates the default log group(`/aws/lambda/${functionName}`).\n   */\n  readonly defaultLogGroupRemovalPolicy?: RemovalPolicy;\n\n  /**\n   * The number of days log events are kept in Scanner Lambda's default log group\n   *\n   * If you use ImageScannerWithTrivy construct multiple times in the same stack, you cannot set different retention days for the default log group.\n   * See `Notes` section in the README for more details.\n   *\n   * @default - Scanner Lambda creates the default log group(`/aws/lambda/${functionName}`) and log events never expire.\n   */\n  readonly defaultLogGroupRetentionDays?: RetentionDays;\n\n  /**\n   * Configuration for scan logs output\n   *\n   * By default, scan logs are output to default log group created by Scanner Lambda.\n   *\n   * Specify this if you want to send scan logs to other than the default log group.\n   *\n   * Currently, only `cloudWatchLogs` is supported.\n   *\n   * @default - scan logs output to default log group created by Scanner Lambda(`/aws/lambda/${functionName}`)\n   */\n  readonly scanLogsOutput?: ScanLogsOutput;\n}\n\n// Maximum Lambda memory size for default AWS account without quota limit increase\nconst DEFAULT_MEMORY_SIZE = 3008;\n\nexport class ImageScannerWithTrivy extends Construct {\n  constructor(scope: Construct, id: string, props: ImageScannerWithTrivyProps) {\n    super(scope, id);\n\n    if (\n      props.memorySize &&\n      !Token.isUnresolved(props.memorySize) &&\n      (props.memorySize < 3008 || props.memorySize > 10240)\n    ) {\n      throw new Error(\n        `You can specify between \\`3008\\` and \\`10240\\` for \\`memorySize\\`, got ${props.memorySize}.`,\n      );\n    }\n\n    const lambdaPurpose = 'Custom::ImageScannerWithTrivyCustomResourceLambda';\n    const customResourceLambda = new SingletonFunction(this, 'CustomResourceLambda', {\n      uuid: '470b6343-d267-f753-226c-1e99f09f319a',\n      lambdaPurpose,\n      runtime: Runtime.FROM_IMAGE,\n      handler: Handler.FROM_IMAGE,\n      code: AssetCode.fromAssetImage(join(__dirname, '../assets/lambda'), {\n        platform: Platform.LINUX_ARM64,\n        // exclude node_modules\n        // because the native binary of the installed esbuild changes depending on the cpu architecture\n        // and the hash value of the image asset changes depending on the execution environment.\n        exclude: ['node_modules'],\n      }),\n      architecture: Architecture.ARM_64,\n      timeout: Duration.seconds(900),\n      retryAttempts: 0,\n      memorySize: props.memorySize ?? DEFAULT_MEMORY_SIZE,\n      ephemeralStorageSize: Size.gibibytes(10), // for cases that need to update trivy DB: /tmp/trivy/db/trivy.db\n    });\n    props.repository.grantPull(customResourceLambda);\n\n    const customResourceLambdaLogGroupConstructName = `DefaultLogGroupFor${lambdaPurpose}`;\n\n    this.validateLambdaDefaultLogGroupOptions(customResourceLambdaLogGroupConstructName, props);\n\n    if (props.defaultLogGroupRemovalPolicy || props.defaultLogGroupRetentionDays) {\n      this.ensureLambdaDefaultLogGroup(\n        customResourceLambda,\n        customResourceLambdaLogGroupConstructName,\n        props,\n      );\n    }\n\n    const imageScannerProvider = new Provider(this, 'Provider', {\n      onEventHandler: customResourceLambda,\n    });\n\n    const imageScannerProperties: ScannerCustomResourceProps = {\n      addr: this.node.addr,\n      imageUri: props.imageUri,\n      ignoreUnfixed: String(props.ignoreUnfixed ?? false),\n      severity: props.severity ?? [Severity.CRITICAL],\n      scanners: props.scanners ?? [],\n      imageConfigScanners: props.imageConfigScanners ?? [],\n      exitCode: props.exitCode ?? 1,\n      exitOnEol: props.exitOnEol ?? 1,\n      trivyIgnore: props.trivyIgnore ?? [],\n      platform: props.platform ?? '',\n      output: props.scanLogsOutput?.bind(customResourceLambda),\n    };\n\n    new CustomResource(this, 'Resource', {\n      resourceType: 'Custom::ImageScannerWithTrivy',\n      properties: imageScannerProperties,\n      serviceToken: imageScannerProvider.serviceToken,\n    });\n  }\n\n  /**\n   * Validates that specified default log group options are the same for existing default log group.\n   */\n  private validateLambdaDefaultLogGroupOptions(\n    logGroupConstructName: string,\n    props: ImageScannerWithTrivyProps,\n  ): void {\n    const existing = Stack.of(this).node.tryFindChild(logGroupConstructName) as\n      | LogGroup\n      | undefined;\n    if (!existing) return;\n\n    const cfnLogGroup = existing.node.defaultChild as CfnLogGroup;\n\n    if (\n      !this.isSameResourceDeletionBehavior(\n        props.defaultLogGroupRemovalPolicy,\n        cfnLogGroup.cfnOptions.deletionPolicy,\n      ) ||\n      cfnLogGroup.retentionInDays !== props.defaultLogGroupRetentionDays\n    ) {\n      Annotations.of(this).addWarningV2(\n        '@image-scanner-with-trivy:duplicateLambdaDefaultLogGroupOptions',\n        \"You have to set the same values for 'defaultLogGroupRemovalPolicy' and 'defaultLogGroupRetentionDays' for each ImageScannerWithTrivy construct in the same stack.\",\n      );\n    }\n  }\n\n  /**\n   * Creates the default log group for Scanner Lambda if it does not exist.\n   *\n   * This method checks if the default log group for Scanner Lambda exists in children of the stack construct.\n   * If it does not exist, it creates the default log group for Scanner Lambda as a child of the stack construct.\n   */\n  private ensureLambdaDefaultLogGroup(\n    singletonFunction: SingletonFunction,\n    logGroupConstructName: string,\n    props: ImageScannerWithTrivyProps,\n  ): LogGroup {\n    const existing = Stack.of(this).node.tryFindChild(logGroupConstructName) as\n      | LogGroup\n      | undefined;\n    if (existing) {\n      return existing;\n    }\n\n    return new LogGroup(Stack.of(this), logGroupConstructName, {\n      logGroupName: `/aws/lambda/${singletonFunction.functionName}`,\n      retention: props.defaultLogGroupRetentionDays,\n      removalPolicy: props.defaultLogGroupRemovalPolicy,\n    });\n  }\n\n  private isSameResourceDeletionBehavior(\n    removalPolicy?: RemovalPolicy,\n    deletionPolicy?: CfnDeletionPolicy,\n  ): boolean {\n    switch (removalPolicy) {\n      case RemovalPolicy.DESTROY:\n        return deletionPolicy === CfnDeletionPolicy.DELETE;\n      case RemovalPolicy.RETAIN:\n        return deletionPolicy === CfnDeletionPolicy.RETAIN;\n      case RemovalPolicy.SNAPSHOT:\n        return deletionPolicy === CfnDeletionPolicy.SNAPSHOT;\n      case RemovalPolicy.RETAIN_ON_UPDATE_OR_DELETE:\n        return deletionPolicy === CfnDeletionPolicy.RETAIN_EXCEPT_ON_CREATE;\n      case undefined:\n        return deletionPolicy === undefined;\n      default:\n        return removalPolicy satisfies never;\n    }\n  }\n}\n"]}