CommentsAppSyncTemplate.yml

AWSTemplateFormatVersion: 2010-09-09
Metadata:
  'AWS::CloudFormation::Designer':
    46a427bf-6114-45b7-8d04-e8a6f0a2cab9:
      size:
        width: 60
        height: 60
      position:
        x: 111
        'y': 69
      z: 0
      embeds: []
Resources:
  CommentsTable:
    Type: 'AWS::DynamoDB::Table'
    Properties:
      TableName: comments
      AttributeDefinitions:
        - AttributeName: id
          AttributeType: S
      KeySchema:
        - AttributeName: id
          KeyType: HASH
      ProvisionedThroughput:
        ReadCapacityUnits: 1
        WriteCapacityUnits: 1
        
  DynamoDBRole:
    Type: AWS::IAM::Role
    Properties:
      RoleName: appsync-comment-app-dynamodb-role
      ManagedPolicyArns:
        - Ref: AppSyncDynamoDBPolicy
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
          - Effect: Allow
            Action:
              - sts:AssumeRole
            Principal:
              Service:
                - appsync.amazonaws.com
    DependsOn:
      - AppSyncDynamoDBPolicy

  AppSyncDynamoDBPolicy:
    Type: AWS::IAM::ManagedPolicy
    Properties:
      Path: /appsync/
      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: !Join [ "", [ !GetAtt CommentsTable.Arn, "*" ] ]

  AppSyncApi:
    Type: "AWS::AppSync::GraphQLApi"
    Description: "The GraphQL API for Comments"
    Properties:
      AuthenticationType: "API_KEY"
      Name: CommentsAPI

  AppSyncSchema:
    Type: "AWS::AppSync::GraphQLSchema"
    Properties:
      ApiId: !GetAtt AppSyncApi.ApiId
      Definition: |
        type Comment {
            id: ID!
            content: String
        }
        
        type CommentConnection {
            items: [Comment]
            nextToken: String
        }
        
        type Mutation {
            saveComment(content: String!): Comment
        }
        
        type Query {
            allComments: CommentConnection
            getComment(id: ID!): Comment
        }
        
        type Schema {
            query: Query
            mutation: Mutation
            subscription: Subscription
        }
        
        type Subscription {
            onSaveComment: Comment
                @aws_subscribe(mutations: ["saveComment"])
        }
  AppSyncCommentTableDataSource:
    Type: "AWS::AppSync::DataSource"
    Properties:
      ApiId: !GetAtt AppSyncApi.ApiId
      Name: CommentsAPI_datasource
      Type: AMAZON_DYNAMODB
      ServiceRoleArn: !GetAtt DynamoDBRole.Arn
      DynamoDBConfig:
        TableName: !Ref CommentsTable
        AwsRegion: !Sub ${AWS::Region}

  AppSyncAllCommentsQueryResolver:
    Type: "AWS::AppSync::Resolver"
    DependsOn: AppSyncSchema
    Properties:
      ApiId: !GetAtt AppSyncApi.ApiId
      TypeName: Query
      FieldName: allComments
      DataSourceName: !GetAtt AppSyncCommentTableDataSource.Name
      RequestMappingTemplate: |
        {
          "version" : "2017-02-28",
          "operation" : "Scan"
        }
      ResponseMappingTemplate: "$util.toJson($ctx.result)"
  AppSyncGetCommentQueryResolver:
    Type: "AWS::AppSync::Resolver"
    DependsOn: AppSyncSchema
    Properties:
      ApiId: !GetAtt AppSyncApi.ApiId
      TypeName: Query
      FieldName: getComment
      DataSourceName: !GetAtt AppSyncCommentTableDataSource.Name
      RequestMappingTemplate: |
        {
          "version": "2017-02-28",
          "operation": "GetItem",
          "key": {
            "id": $util.dynamodb.toDynamoDBJson($ctx.args.id),
          }
        }
      ResponseMappingTemplate: "$util.toJson($ctx.result)"

  AppSyncSaveCommentMutationResolver:
    Type: "AWS::AppSync::Resolver"
    DependsOn: AppSyncSchema
    Properties:
      ApiId: !GetAtt AppSyncApi.ApiId
      TypeName: Mutation
      FieldName: saveComment
      DataSourceName: !GetAtt AppSyncCommentTableDataSource.Name
      RequestMappingTemplate: |
        {
          "version": "2017-02-28",
          "operation": "PutItem",
          "key": {
            "id": $util.dynamodb.toDynamoDBJson($util.autoId()),
          },
          "attributeValues": {
            "content": $util.dynamodb.toDynamoDBJson($ctx.args.content)
          }
        }
      ResponseMappingTemplate: "$util.toJson($ctx.result)"

  AppSyncCommnentApiKey:
    Type: "AWS::AppSync::ApiKey"
    Properties:
      ApiId: !GetAtt AppSyncApi.ApiId

Outputs:
  AppSyncApiKey:
    Description: Api Key de AppSync Comments
    Value: !GetAtt AppSyncCommnentApiKey.ApiKey