serverless.yml

service: lambda-mailer # NOTE: update this with your service name

plugins:
  - serverless-offline-sns
  - serverless-offline
  - serverless-pseudo-parameters

custom:
  stage: ${opt:stage, 'dev'}
  bucketName: ${self:service}-${self:provider.stage}-deploy # build bucket name with stage
  topicName: ${self:service}-sns-mail-notification-${self:custom.stage}
  topicArn: arn:aws:sns:${self:provider.region}:#{AWS::AccountId}:${self:custom.topicName}
  emailFrom: "YourCompanyName <no-reply@yourdomain.com>"
  region: us-west-2
  nodeEnv:
    dev: development
    other: production
  serverless-offline-sns:
    port: 4002
    debug: true
    sns-endpoint: http://127.0.0.1:4002 # Optional. Only if you want to use a custom endpoint

provider:
  name: aws
  runtime: nodejs10.x
  region: ${self:custom.region} # using same region for SNS and Lambda Function
  versionFunctions: false
  stage: ${self:custom.stage}
  environment: # Service wide environment variables
    TOPIC_NAME: ${self:custom.topicName}
    S3_BUCKET: bucket-to-store-email-images
    EMAIL_FROM: ${self:custom.emailFrom}
    NODE_ENV: ${self:custom.nodeEnv.${self:provider.stage}, self:custom.nodeEnv.other}

  iamRoleStatements:
    - Effect: "Allow"
      Action:
        - "ses:*"
      Resource: "*"
    - Effect: "Allow"
      Action: "s3:*"
      Resource: "*"

functions:
  mailerFn:
    handler: index.handler
    memorySize: 256 # optional, in MB, default is 1024
    timeout: 20 # optional, in seconds, default is 6
    events:
      - sns: ${self:custom.topicName}
    onError: arn:aws:sns:#{AWS::Region}:#{AWS::AccountId}:errors-topic
    environment:
      TOPIC_ARN: { "Fn::Join": ["", ["arn:aws:sns:${self:custom.region}:", { "Ref": "AWS::AccountId" }, ":${self:custom.topicArn}" ] ]  }