Cdk-secret-manager-wrapper-layer NPM

`cdk-secret-manager-wrapper-layer`

that Lambda layer uses a wrapper script to fetch information from Secrets Manager and create environmental variables.

idea from source

Updates

2025-03-02: v2.1.0

Added architecture parameter support for Lambda Layer
Updated Python runtime from 3.9 to 3.13
Fixed handler name in example code
Improved layer initialization and referencing patterns
Enhanced compatibility with AWS Lambda ARM64 architecture

Example

import { App, Stack, CfnOutput, Duration } from 'aws-cdk-lib';
import { Effect, PolicyStatement } from 'aws-cdk-lib/aws-iam';
import { Function, Runtime, Code, FunctionUrlAuthType, Architecture } from 'aws-cdk-lib/aws-lambda';
import { CfnSecret } from 'aws-cdk-lib/aws-secretsmanager';
import { SecretManagerWrapperLayer } from 'cdk-secret-manager-wrapper-layer';
const env = {
  region: process.env.CDK_DEFAULT_REGION,
  account: process.env.CDK_DEFAULT_ACCOUNT,
};
const app = new App();
const stack = new Stack(app, 'testing-stack', { env });

/**
 * Example create an Secret for testing.
 */
const secret = new CfnSecret(stack, 'MySecret', {
  secretString: JSON.stringify({
    KEY1: 'VALUE1',
    KEY2: 'VALUE2',
    KEY3: 'VALUE3',
  }),
});

const lambdaArchitecture = Architecture.X86_64;

const layer = new SecretManagerWrapperLayer(stack, 'SecretManagerWrapperLayer', {
  lambdaArchitecture,
});

const lambda = new Function(stack, 'fn', {
  runtime: Runtime.PYTHON_3_13,
  code: Code.fromInline(`
import os
def handler(events, contexts):
    env = {}
    env['KEY1'] = os.environ.get('KEY1', 'Not Found')
    env['KEY2'] = os.environ.get('KEY2', 'Not Found')
    env['KEY3'] = os.environ.get('KEY3', 'Not Found')
    return env
    `),
  handler: 'index.handler',
  layers: [layer.layerVersion],
  timeout: Duration.minutes(1),
  /**
   * you need to define this 4 environment various.
   */
  environment: {
    AWS_LAMBDA_EXEC_WRAPPER: '/opt/get-secrets-layer',
    SECRET_REGION: stack.region,
    SECRET_ARN: secret.ref,
    API_TIMEOUT: '5000',
  },
  architecture: lambdaArchitecture,
});

/**
 * Add Permission for lambda get secret value from secret manager.
 */
lambda.role!.addToPrincipalPolicy(
  new PolicyStatement({
    effect: Effect.ALLOW,
    actions: ['secretsmanager:GetSecretValue'],
    // Also you can use find from context.
    resources: [secret.ref],
  }),
);

/**
 * For Testing.
 */
const FnUrl = lambda.addFunctionUrl({
  authType: FunctionUrlAuthType.NONE,
});

new CfnOutput(stack, 'FnUrl', {
  value: FnUrl.url,
});

Testing

# ex: curl https://sdfghjklertyuioxcvbnmghj.lambda-url.us-east-1.on.aws/
curl ${FnUrl}
{"KEY2":"VALUE2","KEY1":"VALUE1","KEY3":"VALUE3"}

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