AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >
  Serverless Form Handler - accepts a form submission from a webpage, saving the data to a DynamoDB table and sending an email via SES.

Parameters:
  ValidatedEmail:
    Type: String
    Description: (Required) A validated SES email address for receiving new submissions.
    MaxLength: 70
    Default: validated@email.com
    MinLength: 4
    ConstraintDescription: Required. Must be a SES verified email address.

# More info about Globals: https://github.com/awslabs/serverless-application-model/blob/master/docs/globals.rst
Globals:
  Function:
    Timeout: 10
  Api:
    EndpointConfiguration: EDGE
    Cors: 
      AllowMethods: "'OPTIONS,POST'"
      AllowHeaders: "'Content-Type'"
      AllowOrigin: "'*'"    

Resources:
  FormDataTable:
    Type: AWS::DynamoDB::Table
    Properties:
      AttributeDefinitions:
      - AttributeName: formId
        AttributeType: S
      KeySchema:
      - AttributeName: formId
        KeyType: HASH
      BillingMode: PAY_PER_REQUEST
  SubmitFormFunction:
    Type: AWS::Serverless::Function # More info about Function Resource: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction
    Properties:
      CodeUri: submitFormFunction/
      Handler: app.handler
      Runtime: nodejs16.x
      MemorySize: 128
      Environment:
        Variables:
          ValidatedEmail: !Ref ValidatedEmail
          FormDataTable: !Ref FormDataTable
      Policies:
        - DynamoDBCrudPolicy:
            TableName: !Ref FormDataTable
        - SESCrudPolicy:
            IdentityName: !Ref ValidatedEmail
      Events:
        HttpPost:
          Type: Api
          Properties:
            Path: '/submitForm'
            Method: post

Outputs:
  SubmitFormFunction:
    Description: "Lambda Function ARN"
    Value: !GetAtt SubmitFormFunction.Arn
  SubmitFormFunctionIamRole:
    Description: "Implicit IAM Role created for function"
    Value: !GetAtt SubmitFormFunctionRole.Arn
  FormDataTable:
    Description: DynamoDB Table
    Value: !Ref FormDataTable