AWSTemplateFormatVersion: 2010-09-09
Description: Automatic Responder (aka NoReply)

Parameters:
  SESRuleSet:
    Type: String
    Description: "Existing Amazon Simple Email Service (SES) rule set to store the configuration under. Usually default-rule-set is the active rule set."
    Default: "default-rule-set"
    MinLength: 1
  SESRecipients:
    Type: String
    Default: ""
    Description: "Comma-separated recipients (or domains) that the automatic response will apply to. Leave blank to apply to _all_."
  PinpointTemplateName:
    Type: String
    Description: "Amazon Pinpoint template name to use for the automatic response. Note, to use Pinpoint (!) template here, not the SES one."
    MinLength: 1
  DefaultEmail:
    Type: String
    Default: ""
    Description: "Default outgoing email address to send auto-responder emails from. Leave blank if you want the auto-reply to come from the original email address to which the triggering email was sent."

Conditions:
  #  SESRuleSetNotSet: !Equals ["", !Ref SESRuleSet]
  RecipientsNotSet: !Equals ["", !Ref SESRecipients]
#  DefaultEmailNotSet: !Equals ["", !Ref DefaultEmail]
#   NeedsPinpointTemplate: !Equals
#       - ''
#       - !Ref PinpointTemplateName

Resources:
  # PinpointTemplate:
  #   Type: AWS::Pinpoint::EmailTemplate
  #   Condition: NeedsPinpointTemplate
  #   Properties:
  #     Name: !Ref PinpointTemplateName
  SESEmailReceivedRule:
    Type: "AWS::SES::ReceiptRule"
    Properties:
      RuleSetName: !Ref SESRuleSet
      Rule:
        Name: !Ref PinpointTemplateName
        Enabled: true
        Recipients: !If
          - RecipientsNotSet
          - !Ref AWS::NoValue
          - [!Ref SESRecipients]
        Actions:
          - LambdaAction:
              FunctionArn: !GetAtt AutoResponderLambda.Arn
              InvocationType: Event
          - StopAction:
              Scope: RuleSet

  AutoResponderLambda:
    Type: AWS::Lambda::Function
    Properties:
      Handler: index.handler
      Role: !GetAtt AutoResponderLambdaRole.Arn
      Runtime: "nodejs12.x"
      Timeout: 10
      MemorySize: 128
      Environment:
        Variables:
          TemplateName: !Ref PinpointTemplateName
          DefaultEmail: !Ref DefaultEmail
      Code:
        ZipFile: |
          var AWS = require('aws-sdk');

          exports.handler = function (event, context, callback) {
              console.log('Auto-Reply invoked as Lambda Action -- this function is designed to run directly off the receipt - incoming email body is disregarded');

              var sesNotification = event.Records[0].ses;
              console.log("SES Notification:\n", JSON.stringify(sesNotification));

              var pinpoint = new AWS.Pinpoint();
              var params = {
                  TemplateName: process.env.TemplateName
              };
              pinpoint.getEmailTemplate(params, function (err, data) {
                  if (err) {
                      console.log(err.message);
                  }
                  else {
                      console.log("Template pulled: ", data.EmailTemplateResponse.Subject);

                      var from = sesNotification.mail.commonHeaders.from[0];
                      var to = sesNotification.mail.commonHeaders.to[0];
                      var subject = data.EmailTemplateResponse.Subject + sesNotification.mail.commonHeaders.subject;
                      var messageId = sesNotification.mail.commonHeaders.messageId.replace("@amazon.com", "");
                      var sender = (process.env.DefaultEmail!=null && process.env.DefaultEmail != "") ? process.env.DefaultEmail : to;
                      var recipient = from;
                      //const configuration_set = "ConfigSet";
                      //var body_text = data.EmailTemplateResponse.TextPart;
                      var body_html = data.EmailTemplateResponse.HtmlPart;
                      body_html = body_html.replace("%%NAME%%", from).replace("%%ID%%", messageId);
                      var charset = "UTF-8";

                      var ses = new AWS.SES();
                      var params = {
                          Source: sender,
                          Destination: {
                              ToAddresses: [
                                  recipient
                              ],
                          },
                          Message: {
                              Subject: {
                                  Data: subject,
                                  Charset: charset
                              },
                              Body: {
                                  /*Text: {
                                      Data: body_text,
                                      Charset: charset
                                  },*/
                                  Html: {
                                      Data: body_html,
                                      Charset: charset
                                  }
                              }
                          },
                          //ConfigurationSetName: configuration_set
                      };

                      ses.sendEmail(params, function (err, data) {
                          if (err) {
                              console.log(err.message);
                          }
                          else {
                              console.log("Email sent! Message ID: ", data.MessageId);
                          }
                      });
                  }
              });
              console.log('Responding with all clear - in case of sync invocation, etc.');
              callback(null, null);
          };

  AutoResponderLambdaRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Effect: "Allow"
            Principal:
              Service:
                - "lambda.amazonaws.com"
            Action:
              - "sts:AssumeRole"
      Policies:
        - PolicyName: "LambdaExecutionPolicy"
          PolicyDocument:
            Version: "2012-10-17"
            Statement:
              - Effect: "Allow"
                Action:
                  - "mobiletargeting:GetEmailTemplate"
                Resource: !Sub "arn:aws:mobiletargeting:${AWS::Region}:${AWS::AccountId}:templates/*/*"
              - Effect: "Allow"
                Action:
                  - "ses:SendEmail"
                Resource: "arn:aws:ses:*:*:identity/*"
              - Effect: "Allow"
                Action:
                  - "logs:CreateLogGroup"
                  - "logs:CreateLogStream"
                  - "logs:PutLogEvents"
                Resource: !Sub "arn:aws:logs:${AWS::Region}:${AWS::AccountId}:*"

  LambdaInvokePermission:
    Type: AWS::Lambda::Permission
    Properties:
      Action: "lambda:InvokeFunction"
      Principal: "ses.amazonaws.com"
      SourceAccount: !Sub ${AWS::AccountId}
      FunctionName: !GetAtt AutoResponderLambda.Arn