iam.tf

data "aws_caller_identity" "current" {}
data "aws_region" "current" {}

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

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

resource "aws_iam_role_policy" "invocation_policy" {
  name = "authorizer"
  role = aws_iam_role.role.id

  policy = <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": "lambda:InvokeFunction",
      "Effect": "Allow",
      "Resource": "${aws_lambda_function.authorizer.arn}"
    },
    {
      "Effect": "Allow",
      "Action": [
        "logs:CreateLogStream",
        "logs:PutLogEvents",
        "logs:CreateLogGroup"
      ],
      "Resource": [
        "arn:aws:logs:${data.aws_region.current.name}:${data.aws_caller_identity.current.account_id}:log-group:/aws/lambda/*"
      ]
    }
  ]
}
EOF
}