iam.tf

#ROLES
resource "aws_iam_role" "lambda-iam-role" {
  name = "wasteless_lambda_role"
  
  assume_role_policy = <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": "sts:AssumeRole",
      "Principal": {
        "Service": "lambda.amazonaws.com"
      },
      "Effect": "Allow",
      "Sid": ""
    }
  ]
}
EOF
}

#POLICIES
resource "aws_iam_role_policy" "s3-lambda-policy" {
  name = "s3_lambda_policy"
  role = "${aws_iam_role.lambda-iam-role.id}"
  policy = <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "s3:GetObject", "s3:PutObject"
      ],
      "Resource": [
        "arn:aws:s3:::${var.s3_bucket}",
        "arn:aws:s3:::${var.s3_bucket}/*"
      ] 
    }
  ]
}
EOF
}

resource "aws_iam_policy" "lambda_logging" {
  name = "lambda_logging"
  path = "/"
  description = "IAM policy for logging from a lambda"

  policy = <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": [
        "logs:CreateLogGroup",
        "logs:CreateLogStream",
        "logs:PutLogEvents"
      ],
      "Resource": "arn:aws:logs:*:*:*",
      "Effect": "Allow"
    }
  ]
}
EOF
}

resource "aws_iam_role_policy_attachment" "lambda_logs" {
  role = "${aws_iam_role.lambda-iam-role.name}"
  policy_arn = "${aws_iam_policy.lambda_logging.arn}"
}