AppSyncでSNSにメッセージを送信してみる！HTTPデータソースを使ってみよう🥳

Resources:
  SNSRole:
    Type: AWS::IAM::Role
    Properties:
      RoleName: AppSyncDemoSNSRole
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
        - Effect: Allow
          Action:
          - sts:AssumeRole
          Principal:
            Service:
            - appsync.amazonaws.com
      Path: '/'
      Policies:
        - PolicyName: SNSRolePolicy
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
            - Effect: Allow
              Action:
              - sns:*
              - logs:CreateLogGroup
              - logs:CreateLogStream
              - logs:PutLogEvents
              Resource: '*'

Resources:
  DataSource:
    Type: AWS::AppSync::DataSource
    Properties:
      ApiId: !GetAtt GraphQLApi.ApiId
      Name: AppSyncDemoDataSource
      Type: HTTP
      ServiceRoleArn: !GetAtt SNSRole.Arn
      HttpConfig:
          Endpoint: https://sns.ap-northeast-1.amazonaws.com/
          AuthorizationConfig:
            AuthorizationType: AWS_IAM
            AwsIamConfig:
              SigningRegion: ap-northeast-1
              SigningServiceName: sns

Resources:
  GraphQLSchema:
    Type: AWS::AppSync::GraphQLSchema
    Properties:
      ApiId: !GetAtt GraphQLApi.ApiId
      Definition:  |
        type Mutation {
          snsPublish(message: String!): Boolean
        }

        type Query {
          sample: String
        }

        schema {
          query: Query
          mutation: Mutation
        }

  Resolver:
    Type: AWS::AppSync::Resolver
    DependsOn: GraphQLSchema
    Properties:
      ApiId: !GetAtt GraphQLApi.ApiId
      DataSourceName: !GetAtt DataSource.Name
      TypeName: "Mutation"
      FieldName: "snsPublish"
      Kind: UNIT
      RequestMappingTemplate: |
        #set($message = $utils.urlEncode($ctx.args.message))
        #set($topic = $utils.urlEncode("arn:aws:sns:ap-northeast-1:0123456789:AppSyncDemoTopic"))
        {
            "version": "2018-05-29",
            "method": "POST",
            "resourcePath": "/",
            "params": {
                "body": "Action=Publish&Version=2010-03-31&TopicArn=$topic&Message=$message",
                "headers": {
                    "content-type": "application/x-www-form-urlencoded"
                }
            }
        }
      ResponseMappingTemplate: |
        #if($ctx.result.statusCode == 200)
         true
        #else
         false
        #end