template.yml

AWSTemplateFormatVersion: '2010-09-09'
Description: Create AppSync GraphQL API using DynamoDB

Parameters:

  ApiName:
    Type: String
    Description: Name of the API - used to generate unique names for resources
    MinLength: 3
    MaxLength: 25
    AllowedPattern: '^[a-zA-Z][a-zA-Z0-9\-]*$'

Resources:

  GraphQLApi:
    Type: AWS::AppSync::GraphQLApi
    Properties:
      Name: !Sub ${ApiName}-graphql-api
      AuthenticationType: API_KEY

  ApiKey:
    Type: AWS::AppSync::ApiKey
    Properties:
      ApiId: !GetAtt GraphQLApi.ApiId

  GraphQLSchema:
    Type: AWS::AppSync::GraphQLSchema
    Properties:
      ApiId: !GetAtt GraphQLApi.ApiId
      # path to graphql schema file
      DefinitionS3Location: schema.graphql

  ContactsTable:
    Type: AWS::DynamoDB::Table
    Properties:
      TableName: !Sub ${ApiName}-contacts
      KeySchema:
      - AttributeName: username
        KeyType: HASH
      AttributeDefinitions:
      - AttributeName: username
        AttributeType: S
      BillingMode: PAY_PER_REQUEST

  ApiRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
        - Effect: Allow
          Principal:
            Service:
            - appsync.amazonaws.com
          Action:
          - sts:AssumeRole
      Policies:
      - PolicyName: !Sub ${ApiName}-dynamo-access
        PolicyDocument:
          Version: '2012-10-17'
          Statement:
          - Effect: Allow
            Action:
            - dynamodb:GetItem
            - dynamodb:PutItem
            - dynamodb:DeleteItem
            - dynamodb:UpdateItem
            - dynamodb:Query
            - dynamodb:Scan
            - dynamodb:BatchGetItem
            - dynamodb:BatchWriteItem
            Resource: !GetAtt ContactsTable.Arn

  ContactsTableDataSource:
    Type: AWS::AppSync::DataSource
    Properties:
      Name: ContactsTableDataSource
      Type: AMAZON_DYNAMODB
      ServiceRoleArn: !GetAtt ApiRole.Arn
      DynamoDBConfig:
        AwsRegion: !Ref AWS::Region
        TableName: !Ref ContactsTable
      ApiId: !GetAtt GraphQLApi.ApiId

  QueryGetContactsResolver:
    Type: AWS::AppSync::Resolver
    Properties:
      TypeName: Query
      FieldName: getContacts
      DataSourceName: !GetAtt ContactsTableDataSource.Name
      # path to request mapping template file for getContacts
      RequestMappingTemplateS3Location: mapping-templates/getContacts.request.vm
      # path to response mapping template file for getContacts
      ResponseMappingTemplateS3Location: mapping-templates/getContacts.response.vm
      ApiId: !GetAtt GraphQLApi.ApiId

  MutationAddContactResolver:
    Type: AWS::AppSync::Resolver
    Properties:
      TypeName: Mutation
      FieldName: addContact
      DataSourceName: !GetAtt ContactsTableDataSource.Name
      # path to request mapping template file for addContact
      RequestMappingTemplateS3Location: mapping-templates/addContact.request.vm
      # path to response mapping template file for addContact
      ResponseMappingTemplateS3Location: mapping-templates/addContact.response.vm
      ApiId: !GetAtt GraphQLApi.ApiId
  
Outputs:

  GraphQLApiEndpoint:
    Description: GraphQL API URL
    Value: !GetAtt GraphQLApi.GraphQLUrl

  ApiKey:
    Description: API Key
    Value: !GetAtt ApiKey.ApiKey