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Example setup without IAM user

This is a write up of how to use the example for the technique described under "Using Lambda without IAM roles".

Prequisites​

  • Ensure that your local AWS profile is able to deploy to AWS.

Setup​

1. Clone or download the project​

The project can be found at reference project.

2. Install dependencies​

bash
npm i

3. Create the CDK Stack​

This command will deploy the Lambda function and any other resources in the stack.

bash
npx aws-cdk deploy \
  --outputs-file ./cdk-outputs.json

The Remotion packages are also bundled into the stack, these ensures that renderMediaOnLambda() can be executed by the Lambda function.

package.json
json
{
  "dependencies": {
    ...
    "remotion": "^3.3.33",
    "@remotion/lambda": "^3.3.33",
  }
}

The full dependencies are included in the reference project.

4. After deployment​

bash
npx aws-cdk deploy \
  --outputs-file ./cdk-outputs.json
Deployment progress
bash
Bundling asset cdk-stack/render-function/Code/Stage...
  cdk.out/bundling-temp-5e88d0b45626d59e8e8ddce3b05a886b0e1b381df6e5bbbea1dc2727080641a8/index.js  6.3mb ⚠️
⚡ Done in 295ms
✨  Synthesis time: 4.29s
cdk-stack: building assets...
[0%] start: Building 87d5e793cbd198c73c05023515153b142eb2f559e7150579cd2db53362c19b6e:XXXXXXXXXX-us-east-1
[0%] start: Building 779e5babb0ddf0d17c0faebbe5596b03bcf13785f0b20c4cd0fe0c5e616d5593:XXXXXXXXXX-us-east-1
[50%] success: Built 87d5e793cbd198c73c05023515153b142eb2f559e7150579cd2db53362c19b6e:XXXXXXXXXX-us-east-1
[100%] success: Built 779e5babb0ddf0d17c0faebbe5596b03bcf13785f0b20c4cd0fe0c5e616d5593:XXXXXXXXXX-us-east-1
cdk-stack: assets built
cdk-stack: deploying... [1/1]
[0%] start: Publishing 87d5e793cbd198c73c05023515153b142eb2f559e7150579cd2db53362c19b6e:XXXXXXXXXX-us-east-1
[0%] start: Publishing 779e5babb0ddf0d17c0faebbe5596b03bcf13785f0b20c4cd0fe0c5e616d5593:XXXXXXXXXX-us-east-1
[50%] success: Published 779e5babb0ddf0d17c0faebbe5596b03bcf13785f0b20c4cd0fe0c5e616d5593:XXXXXXXXXX-us-east-1
[100%] success: Published 87d5e793cbd198c73c05023515153b142eb2f559e7150579cd2db53362c19b6e:XXXXXXXXXX-us-east-1
 ✅  cdk-stack (no changes)
✨  Deployment time: 1.39s
Output
bash
Outputs:
cdk-stack.apiUrl = https://du7jfr.execute-api.us-east-1.amazonaws.com/
cdk-stack.region = us-east-1
cdk-stack.userPoolClientId = 4l5tsda2iu8lqugl73m8hgeb83
cdk-stack.userPoolId = us-east-1_bVwFsBUGO
Stack ARN:
arn:aws:cloudformation:us-east-1:XXXXXXXXXX:stack/cdk-stack/faf43800-9878-11ed-a070-0aacc64c8662

The output contains the API Gateway base URL, region and Cognito client ID and user pool ID, which are used for authentication.

5. Cleanup​

The following will delete the function, in case it's not needed anymore.

bash
npx aws-cdk destroy

Lambda role​

The CDK creates an IAM role named remotionLambdaServerlessRole which needs the Remotion policy setup.

Test your endpoint​

The API is secured by Cognito which requires an authorization token.

In order to test, you need to do the steps below, just in case you still don't have frontend.

1. Create a Cognito User​

bash
aws cognito-idp sign-up \
  --client-id YOUR_USER_POOL_CLIENT_ID \
  --username "sample@test.com" \
  --password "compLicat3d123"

2. Confirm the user so they can sign in​

bash
aws cognito-idp admin-confirm-sign-up \
  --user-pool-id YOUR_USER_POOL_ID \
  --username "sample@test.com"

3. Log the user to retrieve an identity JWT token​

bash
aws cognito-idp initiate-auth \
  --auth-flow USER_PASSWORD_AUTH \
  --auth-parameters \
  USERNAME="sample@test.com",PASSWORD="compLicat3d123" \
  --client-id YOUR_USER_POOL_CLIENT_ID

YOUR_USER_POOL_CLIENT_ID and YOUR_USER_POOL_ID are part of the CDK output.

Output
bash
{
    "ChallengeParameters": {},
    "AuthenticationResult": {
        "AccessToken": "eyJraWQiOiJGcUJ....",
        "ExpiresIn": 3600,
        "TokenType": "Bearer",
        "RefreshToken": "eyJjdHkiOiJKV1QiLCJlbm...",
        "IdToken": "eyJraWQiOiJCcjY3Rk5WdzRpYVVYVlpNdF..."
    }
}

The API will give you a verbose response but will only use the IdToken.

4. Use the token to invoke a request to the endpoint using curl.​

Request​

bash
curl --location --request POST 'https://du7jfr6.execute-api.us-east-1.amazonaws.com/render' \
--header 'Authorization: Bearer eyJraWQiOiJGcUJFV1B1cHhxM0NXRko0RVN2..........'

Response​

bash
{"message":"SUCCESS","bucketName":"remotionlambda-apsoutheast2-5essis84y1","renderId":"1pwhfhh11z"}

That's it! You now have an API that you can use to invoke the rendering of a video.

warning

It is important to note that the Lambda function should not be accessible to unauthenticated users.
The function uses version 2 of the CDK, which is still being actively developed.

Next Steps​

See also​