api_gateway_lambda.tf

provider "aws" {
  region = "eu-west-1"
}

# Lambda
resource "aws_lambda_function" "tf-example" {
  function_name = "ServerlessExample"

  # The bucket name as created earlier with "aws s3api create-bucket"
  s3_bucket = "tf-example-store"
  s3_key    = "v1.0.0/tf-example.zip"

  # "main" is the filename within the zip file (main.js) and "handler"
  # is the name of the property under which the handler function was
  # exported in that file.
  handler = "main.handler"
  runtime = "nodejs10.x"

  role = aws_iam_role.lambda_exec.arn
}

# IAM role which dictates what other AWS services the Lambda function
# may access.
resource "aws_iam_role" "lambda_exec" {
  name = "serverless_example_lambda"

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

}


# API Gateway
resource "aws_api_gateway_rest_api" "tf-example" {
  name        = "ServerlessExample"
  description = "Terraform Serverless Application Example"
}

resource "aws_api_gateway_resource" "proxy" {
  rest_api_id = aws_api_gateway_rest_api.tf-example.id
  parent_id   = aws_api_gateway_rest_api.tf-example.root_resource_id
  path_part   = "{proxy+}"
}

resource "aws_api_gateway_method" "proxy" {
  rest_api_id   = aws_api_gateway_rest_api.tf-example.id
  resource_id   = aws_api_gateway_resource.proxy.id
  http_method   = "ANY"
  authorization = "NONE"
}

resource "aws_api_gateway_integration" "lambda" {
  rest_api_id = aws_api_gateway_rest_api.tf-example.id
  resource_id = aws_api_gateway_method.proxy.resource_id
  http_method = aws_api_gateway_method.proxy.http_method

  integration_http_method = "POST"
  type                    = "AWS_PROXY"
  uri                     = aws_lambda_function.tf-example.invoke_arn
}

resource "aws_api_gateway_method" "proxy_root" {
  rest_api_id   = aws_api_gateway_rest_api.tf-example.id
  resource_id   = aws_api_gateway_rest_api.tf-example.root_resource_id
  http_method   = "ANY"
  authorization = "NONE"
}

resource "aws_api_gateway_integration" "lambda_root" {
  rest_api_id = aws_api_gateway_rest_api.tf-example.id
  resource_id = aws_api_gateway_method.proxy_root.resource_id
  http_method = aws_api_gateway_method.proxy_root.http_method

  integration_http_method = "POST"
  type                    = "AWS_PROXY"
  uri                     = aws_lambda_function.tf-example.invoke_arn
}

resource "aws_api_gateway_deployment" "tf-example" {
  depends_on = [
    aws_api_gateway_integration.lambda,
    aws_api_gateway_integration.lambda_root,
  ]

  rest_api_id = aws_api_gateway_rest_api.tf-example.id
  stage_name  = "test"
}



# Permission for API to run lambda
resource "aws_lambda_permission" "apigw" {
  statement_id  = "AllowAPIGatewayInvoke"
  action        = "lambda:InvokeFunction"
  function_name = aws_lambda_function.tf-example.function_name
  principal     = "apigateway.amazonaws.com"

  # The "/*/*" portion grants access from any method on any resource
  # within the API Gateway REST API.
  source_arn = "${aws_api_gateway_rest_api.tf-example.execution_arn}/*/*"
}


output "base_url" {
  value = aws_api_gateway_deployment.tf-example.invoke_url
}

v2.tf

# resource "aws_ses_email_identity" "sender_address" {
#   email = "email@example.com"
# }

# resource "aws_ses_email_identity" "recepient_address" {
#   email = "email@example.com"
# }


provider "aws" {
  region = "eu-west-1"
}

# Lambda
resource "aws_lambda_function" "darth_mailer" {
  function_name = "DarthMailer"

  # The bucket name as created earlier with "aws s3api create-bucket"
  s3_bucket = "tf-example-store"
  s3_key    = "v1.0.1/tf-example.zip"

  # "main" is the filename within the zip file (main.js) and "handler"
  # is the name of the property under which the handler function was
  # exported in that file.
  handler = "main.handler"
  runtime = "nodejs12.x"

  role = aws_iam_role.lambda_exec.arn
}

# IAM role which dictates what other AWS services the Lambda function
# may access.
resource "aws_iam_role" "lambda_exec" {
  name = "serverless_example_lambda"

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

}

# Use SES iam policy
resource "aws_iam_role_policy" "ses_policy" {
  name = "ses-policy"
  role = aws_iam_role.lambda_exec.id
  # description = "Give access to SES"

  policy = <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "ses:SendEmail"
      ],
      "Resource": "*"
    }
  ]
}
EOF
}

# Use logs iam policy
resource "aws_iam_role_policy" "logs_policy" {
  name = "logs-policy"
  role = aws_iam_role.lambda_exec.id
  # description = "Give access to logs"

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


# API Gateway
resource "aws_api_gateway_rest_api" "darth_mailer" {
  name        = "DarthMailer"
  description = "A Serverless Application for Email Forms"
}

# resource "aws_api_gateway_resource" "root" {
#   rest_api_id = aws_api_gateway_rest_api.darth_mailer.id
#   parent_id   = aws_api_gateway_rest_api.darth_mailer.root_resource_id
#   path_part   = ""
# }

# resource "aws_api_gateway_resource" "proxy" {
#   rest_api_id = aws_api_gateway_rest_api.tf-example.id
#   parent_id   = aws_api_gateway_rest_api.tf-example.root_resource_id
#   path_part   = "{proxy+}"
# }

# resource "aws_api_gateway_method" "proxy" {
#   rest_api_id   = aws_api_gateway_rest_api.tf-example.id
#   resource_id   = aws_api_gateway_resource.proxy.id
#   http_method   = "ANY"
#   authorization = "NONE"
# }

# resource "aws_api_gateway_integration" "lambda" {
#   rest_api_id = aws_api_gateway_rest_api.darth_mailer.id
#   resource_id = aws_api_gateway_method.proxy.resource_id
#   http_method = aws_api_gateway_method.proxy.http_method

#   integration_http_method = "POST"
#   type                    = "AWS_PROXY"
#   uri                     = aws_lambda_function.darth_mailer.invoke_arn
# }

resource "aws_api_gateway_method" "method_request_post_root" {
  rest_api_id   = aws_api_gateway_rest_api.darth_mailer.id
  resource_id   = aws_api_gateway_rest_api.darth_mailer.root_resource_id
  http_method   = "POST"
  authorization = "NONE"
}

resource "aws_api_gateway_method" "method_request_options_root" {
  rest_api_id   = aws_api_gateway_rest_api.darth_mailer.id
  resource_id   = aws_api_gateway_rest_api.darth_mailer.root_resource_id
  http_method   = "OPTIONS"
  authorization = "NONE"
}

resource "aws_api_gateway_integration" "integration_request_options_lambda_root" {
  rest_api_id = aws_api_gateway_rest_api.darth_mailer.id
  resource_id = aws_api_gateway_method.method_request_options_root.resource_id
  http_method = aws_api_gateway_method.method_request_options_root.http_method

  integration_http_method = "OPTIONS"
  type                    = "MOCK"
  passthrough_behavior    = "WHEN_NO_MATCH"
}

resource "aws_api_gateway_integration" "integration_request_post_lambda_root" {
  rest_api_id = aws_api_gateway_rest_api.darth_mailer.id
  resource_id = aws_api_gateway_method.method_request_post_root.resource_id
  http_method = aws_api_gateway_method.method_request_post_root.http_method

  integration_http_method = "POST"
  type                    = "AWS"
  uri                     = aws_lambda_function.darth_mailer.invoke_arn
  content_handling        = "CONVERT_TO_TEXT"
  passthrough_behavior    = "WHEN_NO_TEMPLATES"

  request_templates = {
    "application/json" = <<EOF
{
  "grecaptcha"   : $input.json('$.g-recaptcha-response'),
  "senderName"   : $input.json('$.name'),
  "senderAddress": $input.json('$.email'),
  "apiKey"       : $input.json('$.key'),
  "message"      : $input.json('$.message')
}
EOF
  }
}

resource "aws_api_gateway_method_response" "method_response_options_200" {
  rest_api_id = aws_api_gateway_rest_api.darth_mailer.id
  resource_id = aws_api_gateway_method.method_request_options_root.resource_id
  http_method = aws_api_gateway_method.method_request_options_root.http_method
  status_code = "200"

  response_models = { "application/json" = "Empty" }
  response_parameters = {
    "method.response.header.Access-Control-Allow-Origin"  = true,
    "method.response.header.Access-Control-Allow-Methods" = true,
    "method.response.header.Access-Control-Allow-Headers" = true,
  }
}

resource "aws_api_gateway_method_response" "method_response_post_200" {
  rest_api_id = aws_api_gateway_rest_api.darth_mailer.id
  resource_id = aws_api_gateway_method.method_request_post_root.resource_id
  http_method = aws_api_gateway_method.method_request_post_root.http_method
  status_code = "200"

  response_models = { "application/json" = "Empty" }
  response_parameters = {
    "method.response.header.Access-Control-Allow-Origin" = true
  }
}

resource "aws_api_gateway_method_response" "method_response_post_400" {
  rest_api_id = aws_api_gateway_rest_api.darth_mailer.id
  resource_id = aws_api_gateway_method.method_request_post_root.resource_id
  http_method = aws_api_gateway_method.method_request_post_root.http_method
  status_code = "400"
}

resource "aws_api_gateway_method_response" "method_response_post_401" {
  rest_api_id = aws_api_gateway_rest_api.darth_mailer.id
  resource_id = aws_api_gateway_method.method_request_post_root.resource_id
  http_method = aws_api_gateway_method.method_request_post_root.http_method
  status_code = "401"
}

resource "aws_api_gateway_method_response" "method_response_post_422" {
  rest_api_id = aws_api_gateway_rest_api.darth_mailer.id
  resource_id = aws_api_gateway_method.method_request_post_root.resource_id
  http_method = aws_api_gateway_method.method_request_post_root.http_method
  status_code = "422"
}

resource "aws_api_gateway_method_response" "method_response_post_500" {
  rest_api_id = aws_api_gateway_rest_api.darth_mailer.id
  resource_id = aws_api_gateway_method.method_request_post_root.resource_id
  http_method = aws_api_gateway_method.method_request_post_root.http_method
  status_code = "500"
}

resource "aws_api_gateway_integration_response" "integration_response_root_options_200" {
  rest_api_id = aws_api_gateway_rest_api.darth_mailer.id
  resource_id = aws_api_gateway_method.method_request_options_root.resource_id
  http_method = aws_api_gateway_method.method_request_options_root.http_method
  status_code = "200"

  depends_on = [
    aws_api_gateway_integration.integration_request_options_lambda_root,
    aws_api_gateway_method_response.method_response_options_200
  ]

  selection_pattern = "-"
  response_parameters = {
    "method.response.header.Access-Control-Allow-Methods" = "'POST,OPTIONS'",
    "method.response.header.Access-Control-Allow-Headers" = "'Content-Type,X-Amz-Date,Authorization,X-Api-Key,X-Amz-Security-Token'",
    "method.response.header.Access-Control-Allow-Origin"  = "'*'"
  }
}

resource "aws_api_gateway_integration_response" "integration_response_root_post_200" {
  rest_api_id = aws_api_gateway_rest_api.darth_mailer.id
  resource_id = aws_api_gateway_method.method_request_post_root.resource_id
  http_method = aws_api_gateway_method.method_request_post_root.http_method
  status_code = "200"
  depends_on = [
    aws_api_gateway_integration.integration_request_post_lambda_root,
    aws_api_gateway_method_response.method_response_post_200
  ]

  selection_pattern = "-"
  response_parameters = {
    "method.response.header.Access-Control-Allow-Origin" = "'*'"
  }
}

resource "aws_api_gateway_integration_response" "integration_response_root_post_400" {
  rest_api_id = aws_api_gateway_rest_api.darth_mailer.id
  resource_id = aws_api_gateway_method.method_request_post_root.resource_id
  http_method = aws_api_gateway_method.method_request_post_root.http_method
  status_code = "400"
  depends_on = [
    aws_api_gateway_integration.integration_request_post_lambda_root,
    aws_api_gateway_method_response.method_response_post_400
  ]

  selection_pattern = ".*400.*"
}

resource "aws_api_gateway_integration_response" "integration_response_root_post_401" {
  rest_api_id = aws_api_gateway_rest_api.darth_mailer.id
  resource_id = aws_api_gateway_method.method_request_post_root.resource_id
  http_method = aws_api_gateway_method.method_request_post_root.http_method
  status_code = "401"
  depends_on = [
    aws_api_gateway_integration.integration_request_post_lambda_root,
    aws_api_gateway_method_response.method_response_post_401
  ]

  selection_pattern = ".*401.*"
}

resource "aws_api_gateway_integration_response" "integration_response_root_post_422" {
  rest_api_id = aws_api_gateway_rest_api.darth_mailer.id
  resource_id = aws_api_gateway_method.method_request_post_root.resource_id
  http_method = aws_api_gateway_method.method_request_post_root.http_method
  status_code = "422"
  depends_on = [
    aws_api_gateway_integration.integration_request_post_lambda_root,
    aws_api_gateway_method_response.method_response_post_422
  ]

  selection_pattern = ".*422.*"
}

resource "aws_api_gateway_integration_response" "integration_response_root_post_500" {
  rest_api_id = aws_api_gateway_rest_api.darth_mailer.id
  resource_id = aws_api_gateway_method.method_request_post_root.resource_id
  http_method = aws_api_gateway_method.method_request_post_root.http_method
  status_code = "500"
  depends_on = [
    aws_api_gateway_integration.integration_request_post_lambda_root,
    aws_api_gateway_method_response.method_response_post_500
  ]

  selection_pattern = ".*500.*"
}

resource "aws_api_gateway_deployment" "darth_mailer" {
  depends_on = [
    # aws_api_gateway_integration.lambda,
    # aws_api_gateway_integration.integration_request_options_lambda_root,
    # aws_api_gateway_integration.integration_request_post_lambda_root,
    aws_api_gateway_integration_response.integration_response_root_options_200,
    aws_api_gateway_integration_response.integration_response_root_post_200,
    aws_api_gateway_integration_response.integration_response_root_post_400,
    aws_api_gateway_integration_response.integration_response_root_post_401,
    aws_api_gateway_integration_response.integration_response_root_post_422,
    aws_api_gateway_integration_response.integration_response_root_post_500,
  ]

  rest_api_id = aws_api_gateway_rest_api.darth_mailer.id
  stage_name  = "dev"
}



# Permission for API to run lambda
resource "aws_lambda_permission" "apigw" {
  statement_id  = "AllowAPIGatewayInvoke"
  action        = "lambda:InvokeFunction"
  function_name = aws_lambda_function.darth_mailer.function_name
  principal     = "apigateway.amazonaws.com"

  # The "/*/*" portion grants access from any method on any resource
  # within the API Gateway REST API.
  source_arn = "${aws_api_gateway_rest_api.darth_mailer.execution_arn}/*/*"
}


output "base_url" {
  value = aws_api_gateway_deployment.darth_mailer.invoke_url
}