Terraform Aws S3 Resource Example

Add notification configuration to SNS Topic

resource "aws_sns_topic" "topic" {
  name = "s3-event-notification-topic"

  policy = <<POLICY
{
    "Version":"2012-10-17",
    "Statement":[{
        "Effect": "Allow",
        "Principal": {"AWS":"*"},
        "Action": "SNS:Publish",
        "Resource": "arn:aws:sns:*:*:s3-event-notification-topic",
        "Condition":{
            "ArnLike":{"aws:SourceArn":"${aws_s3_bucket.bucket.arn}"}
        }
    }]
}
POLICY
}

resource "aws_s3_bucket" "bucket" {
  bucket = "your_bucket_name"
}

resource "aws_s3_bucket_notification" "bucket_notification" {
  bucket = "${aws_s3_bucket.bucket.id}"

  topic {
    topic_arn     = "${aws_sns_topic.topic.arn}"
    events        = ["s3:ObjectCreated:*"]
    filter_suffix = ".log"
  }
}

Add notification configuration to Lambda Function

resource "aws_iam_role" "iam_for_lambda" {
  name = "iam_for_lambda"

  assume_role_policy = <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": "sts:AssumeRole",
      "Principal": {
        "Service": "lambda.amazonaws.com"
      },
      "Effect": "Allow"
    }
  ]
}
EOF
}

resource "aws_lambda_permission" "allow_bucket" {
  statement_id  = "AllowExecutionFromS3Bucket"
  action        = "lambda:InvokeFunction"
  function_name = "${aws_lambda_function.func.arn}"
  principal     = "s3.amazonaws.com"
  source_arn    = "${aws_s3_bucket.bucket.arn}"
}

resource "aws_lambda_function" "func" {
  filename      = "your-function.zip"
  function_name = "example_lambda_name"
  role          = "${aws_iam_role.iam_for_lambda.arn}"
  handler       = "exports.example"
  runtime       = "go1.x"
}

resource "aws_s3_bucket" "bucket" {
  bucket = "your_bucket_name"
}

resource "aws_s3_bucket_notification" "bucket_notification" {
  bucket = "${aws_s3_bucket.bucket.id}"

  lambda_function {
    lambda_function_arn = "${aws_lambda_function.func.arn}"
    events              = ["s3:ObjectCreated:*"]
    filter_prefix       = "AWSLogs/"
    filter_suffix       = ".log"
  }
}

import

S3 bucket notification can be imported using the bucket

terraform import aws_s3_bucket_notification.bucket_notification bucket-name

https://www.terraform.io/docs/providers/aws/r/s3_bucket_notification.html

localstack endpoints

https://www.terraform.io/docs/providers/aws/guides/custom-service-endpoints.html#localstack