Upload files to AWS S3 via Slack with Lambda Function

This project contains an AWS Lambda function written in Go that responds to a Slack event API request containing a file upload, copies the file to an S3 bucket, and returns a success message.

Usage

1. Clone the repository

git clone https://github.com/sv222/slack-lambda-s3.git
cd slack-lambda-s3

2. Create an S3 bucket

cd terraform
terraform init
terraform apply \
  -var="bucket_name=my-bucket-name" \
  -var="region=us-west-2"

Replace my-bucket-name with the desired name of the S3 bucket, and replace us-west-2 with the desired AWS region.

3. Configure the Slack app and AWS Lambda function

1. Create a new Slack app with an event subscription for file_shared.
2. Create a new AWS Lambda function with the slack-s3-lambda.zip deployment package.
3. Set the following environment variables for the Lambda function:

AWS_REGION: the AWS region in which the S3 bucket was created
SLACK_BOT_TOKEN: the Slack bot token for the app

4. Deploy the Lambda function

cd lambda
GOOS=linux go build -o main
zip slack-lambda-s3.zip main
aws lambda update-function-code \
  --function-name=my-lambda-function \
  --zip-file fileb://slack-lambda-s3.zip

Replace my-lambda-function with the name of the Lambda function.

5. Test the Lambda function

• Upload a file to a Slack channel that the Slack app is a member of.
• Verify that the file was copied to the S3 bucket and that the Lambda function returned a success message.

Configuration

The Terraform configuration for the S3 bucket is located in the terraform directory. The following variables can be passed to Terraform:

bucket_name: The name of the S3 bucket to create.
region: The AWS region in which to create the S3 bucket.

The AWS Lambda function code is located in the lambda directory. The following environment variables must be set:

AWS_REGION: The AWS region in which the S3 bucket was created.
SLACK_BOT_TOKEN: The Slack bot token for the app.

Contributing

Feel free to contribute to this project by submitting pull requests or reporting issues.

License

This project is licensed under the MIT License. See the LICENSE file for details.