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fun EditText.afterTextChanged(afterTextChanged: (String) -> Unit) {
    this.addTextChangedListener(object: TextWatcher {
        override fun afterTextChanged(s: Editable?) {
            afterTextChanged.invoke(s.toString())
        }

        override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) { }

        override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) { }
    })

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fun EditText.validate(validator: (String) -> Boolean, message: String) {
    this.afterTextChanged {
        this.error = if (validator(it)) null else message
    }
    this.error = if (validator(this.text.toString())) null else message
}

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---
Description: AWSAppSync DynamoDB Example
Resources:
  GraphQLApi:
    Type: "AWS::AppSync::GraphQLApi"
    Properties:
      Name: AWSAppSync DynamoDB Example
      AuthenticationType: AWS_IAM

  PostDynamoDBTableDataSource:

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---
Description: AWS AppSync Notes API

Parameters:
  APIName:
    Type: String
    Description: Name of the API - used to generate unique names for resources
    MinLength: 3
    MaxLength: 20
    AllowedPattern: '^[a-zA-Z][a-zA-Z0-9_]*$'

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  SNSRole:
    Type: AWS::IAM::Role
    Description: "An IAM Role to allow Cognito to send SNS messages"
    Properties:
      RoleName: !Sub ${APIName}-cognito-sns-role
      ManagedPolicyArns:
        - Ref: CognitoSNSPolicy
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:

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  UserPool:
    Type: "AWS::Cognito::UserPool"
    Description: "A Cognito user pool for authenticating users"
    Properties:
      UserPoolName: !Sub ${APIName}-user-pool
      AutoVerifiedAttributes:
        - phone_number
      MfaConfiguration: "ON"
      SmsConfiguration:
        ExternalId: !Sub ${APIName}-external

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  DynamoDBNotesTable:
    Type: "AWS::DynamoDB::Table"
    Description: "Data store for AWS AppSync Notes Type"
    Properties:
      TableName: !Sub ${APIName}-notes-table
      AttributeDefinitions:
        - AttributeName: "NoteId"
          AttributeType: "S"
        - AttributeName: "UserId"
          AttributeType: "S"

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  DynamoDBRole:
    Type: AWS::IAM::Role
    Properties:
      RoleName: !Sub ${APIName}-appsync-dynamodb-role
      ManagedPolicyArns:
        - Ref: AppSyncDynamoDBPolicy
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
          - Effect: Allow

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  AppSyncApi:
    Type: "AWS::AppSync::GraphQLApi"
    Description: "The GraphQL API for the Notes App"
    Properties:
      AuthenticationType: "AMAZON_COGNITO_USER_POOLS"
      Name: !Sub ${APIName}
      UserPoolConfig:
        UserPoolId: !Ref UserPoolClient
        AwsRegion: !Sub ${AWS::Region}
        DefaultAction: "ALLOW"

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  AppSyncAllNotesQueryResolver:
    Type: "AWS::AppSync::Resolver"
    DependsOn: AppSyncSchema
    Properties:
      ApiId: !GetAtt AppSyncApi.ApiId
      TypeName: Query
      FieldName: allNotes
      DataSourceName: !GetAtt AppSyncNotesTableDataSource.Name
      RequestMappingTemplate: |
        {