iam.tf

resource "aws_iam_role" "iam_for_lambda" {
  name = "iam_for_lambda-${local.function_name}"

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

resource "aws_iam_policy" "lambda" {
  name = "lambda_${local.function_name}"

  policy = <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "LambdaCreateLogs",
      "Action": [
        "logs:CreateLogStream",
        "logs:PutLogEvents"
      ],
      "Resource": "arn:aws:logs:*:*:*",
      "Effect": "Allow"
    },
    {
      "Sid": "LambdaModifyDNS",
      "Action": "route53:ChangeResourceRecordSets",
      "Resource": "arn:aws:route53:::hostedzone/${data.aws_route53_zone.primary.zone_id}",
      "Effect": "Allow"
    }
  ]
}
EOF
}

resource "aws_iam_role_policy_attachment" "lambda" {
  role       = aws_iam_role.iam_for_lambda.name
  policy_arn = aws_iam_policy.lambda.arn
}