template.yml

AWSTemplateFormatVersion: '2010-09-09'
Parameters:
  awsRegion:
    Type: String
    Default: ap-northeast-1
  awsAccount:
    Type: String
    Default: set-your-account-here
Resources:
  AppSyncDynamoRole:
    Type: 'AWS::IAM::Role'
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
          - Effect: Allow
            Principal:
              Service:
                - appsync.amazonaws.com
            Action:
              - 'sts:AssumeRole'
      Path: /cloudformation/
      RoleName:
        Fn::Join:
          - ''
          - - !Ref awsRegion
            - '-appsync-dynamodb-role'
      Policies:
        - PolicyName: test-appsync-dynamodb
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action:
                  - 'dynamodb:DeleteItem'
                  - 'dynamodb:GetItem'
                  - 'dynamodb:PutItem'
                  - 'dynamodb:Query'
                  - 'dynamodb:Scan'
                  - 'dynamodb:UpdateItem'
                Resource:
                  - Fn::Join:
                      - ''
                      - - 'arn:aws:dynamodb:'
                        - !Ref awsRegion
                        - ':'
                        - !Ref awsAccount
                        - ':table/users'
                  - Fn::Join:
                      - ''
                      - - 'arn:aws:dynamodb:'
                        - !Ref awsRegion
                        - ':'
                        - !Ref awsAccount
                        - ':table/users/*'
  UserTable:
    Type: AWS::DynamoDB::Table
    Properties:
      AttributeDefinitions:
        - AttributeName: 'id'
          AttributeType: 'S'
      KeySchema:
        - AttributeName: 'id'
          KeyType: 'HASH'
      ProvisionedThroughput:
        ReadCapacityUnits: '5'
        WriteCapacityUnits: '5'
      TableName: 'users'
  AppSyncGraphqlAPI:
    Type: 'AWS::AppSync::GraphQLApi'
    Properties:
      Name: GraphqlAPI #required
      AuthenticationType: 'API_KEY' #required
  AppSyncAPIKey:
    Type: AWS::AppSync::ApiKey
    DependsOn: [AppSyncGraphqlAPI]
    Properties:
      ApiId:
        Fn::GetAtt: [AppSyncGraphqlAPI, ApiId]
      Expires: 1598885999 # 2020-08-31 23:59:59（秒単位）
  #  Schema定義
  AppSyncSchema:
    Type: AWS::AppSync::GraphQLSchema
    DependsOn: [AppSyncGraphqlAPI]
    Properties:
      ApiId:
        Fn::GetAtt: [AppSyncGraphqlAPI, ApiId]
      Definition: |
        input CreateUserInput {
            name: String!
        }

        input DeleteUserInput {
            id: ID!
        }

        type Mutation {
            createUser(input: CreateUserInput!): User
            updateUser(input: UpdateUserInput!): User
            deleteUser(input: DeleteUserInput!): User
        }

        type Query {
            getUser(id: ID!): User
        }

        input UpdateUserInput {
            id: ID!
            name: String!
        }

        type User {
            id: ID!
            name: String!
        }

        schema {
            query: Query
            mutation: Mutation
        }
  # DataSource定義
  AppSyncUserDataSource:
    Type: AWS::AppSync::DataSource
    DependsOn:
        [AppSyncGraphqlAPI, AppSyncDynamoRole, UserTable]
    Properties:
      ApiId:
        Fn::GetAtt: [AppSyncGraphqlAPI, ApiId]
      Name: 'users'
      Type: 'AMAZON_DYNAMODB'
      ServiceRoleArn:
        Fn::GetAtt: [AppSyncDynamoRole, Arn ]
      DynamoDBConfig:
        AwsRegion:
          Ref: awsRegion
        TableName: users
  # Resolver定義
  # Mutation
  ## CreateUser
  AppSyncCreateUserResolver:
    Type: AWS::AppSync::Resolver
    DependsOn:
      [AppSyncGraphqlAPI, AppSyncUserDataSource]
    Properties:
      ApiId:
        Fn::GetAtt: [AppSyncGraphqlAPI, ApiId]
      TypeName: Mutation
      FieldName: createUser
      DataSourceName: 
        Fn::GetAtt: [AppSyncUserDataSource, Name]
      RequestMappingTemplate: |
        {
            "version" : "2017-02-28",
            "operation" : "PutItem",
            "key" : {
                "id": $util.dynamodb.toDynamoDBJson($util.autoId()),
            },
            "attributeValues" : $util.dynamodb.toMapValuesJson($ctx.args.input),
            "condition": {
                "expression": "attribute_not_exists(#id)",
                "expressionNames": {
                    "#id": "id",
                }
            }
        }
      ResponseMappingTemplate: $util.toJson($ctx.result)
  ## UpdateUser
  AppSyncUpdateUserResolver:
    Type: AWS::AppSync::Resolver
    DependsOn:
      [AppSyncGraphqlAPI, AppSyncUserDataSource]
    Properties:
      ApiId:
        Fn::GetAtt: [AppSyncGraphqlAPI, ApiId]
      TypeName: Mutation
      FieldName: updateUser
      DataSourceName: 
        Fn::GetAtt: [AppSyncUserDataSource, Name]
      RequestMappingTemplate: |
        {
            "version" : "2017-02-28",
            "operation" : "UpdateItem",
            "key" : {
                "id" : $util.dynamodb.toDynamoDBJson($ctx.args.input.id)
            },
            "update" : {
                "expression" : "SET #n = :name",
                "expressionNames": {
                    "#n": "name"
                },
                "expressionValues": {
                    ":name" : $util.dynamodb.toDynamoDBJson($ctx.args.input.name)
                }
            }
        }
      ResponseMappingTemplate: $util.toJson($ctx.result)
  ## DeleteUser
  AppSyncDeleteUserResolver:
    Type: AWS::AppSync::Resolver
    DependsOn:
      [AppSyncGraphqlAPI, AppSyncUserDataSource]
    Properties:
      ApiId:
        Fn::GetAtt: [AppSyncGraphqlAPI, ApiId]
      TypeName: Mutation
      FieldName: deleteUser
      DataSourceName: 
        Fn::GetAtt: [AppSyncUserDataSource, Name]
      RequestMappingTemplate: |
        {
            "version" : "2017-02-28",
            "operation" : "DeleteItem",
            "key" : {
                "id" : $util.dynamodb.toDynamoDBJson($ctx.args.input.id),
            }
        }
      ResponseMappingTemplate: $util.toJson($ctx.result)
  # Query
  ## GetUser
  AppSyncGetUserResolver:
    Type: AWS::AppSync::Resolver
    DependsOn:
      [AppSyncGraphqlAPI, AppSyncUserDataSource]
    Properties:
      ApiId:
        Fn::GetAtt: [AppSyncGraphqlAPI, ApiId]
      TypeName: Query
      FieldName: getUser
      DataSourceName: 
        Fn::GetAtt: [AppSyncUserDataSource, Name]
      RequestMappingTemplate: |
        {
            "version": "2017-02-28",
            "operation": "GetItem",
            "key": {
                "id": $util.dynamodb.toDynamoDBJson($ctx.args.id),
            }
        }
      ResponseMappingTemplate: $util.toJson($ctx.result)