Amplifyで自動構築される内容の観察：VTL編

$ amplify add api
? Please select from one of the below mentioned services: GraphQL
? Provide API name: amplifytest
? Choose the default authorization type for the API Amazon Cognito User Pool
 Do you want to use the default authentication and security configuration? Default configuration
 How do you want users to be able to sign in? Username
 Do you want to configure advanced settings? No, I am done.
? Do you want to configure advanced settings for the GraphQL API No, I am done.
? Do you have an annotated GraphQL schema? No
? Choose a schema template: Single object with fields (e.g., “Todo” with ID, name, description)
? Do you want to edit the schema now? No

$ amplify push
? Are you sure you want to continue? Yes
? Do you want to generate code for your newly created GraphQL API Yes
? Choose the code generation language target javascript
? Enter the file name pattern of graphql queries, mutations and subscriptions src/graphql/**/*.js
? Do you want to generate/update all possible GraphQL operations - queries, mutations and subscriptions Yes
? Enter maximum statement depth [increase from default if your schema is deeply nested] 2

type Todo @model {
  id: ID!
  name: String!
  description: String
}

#if( $authCondition && $authCondition.expression != "" )
  #set( $condition = $authCondition )
  #if( $modelObjectKey )
    #foreach( $entry in $modelObjectKey.entrySet() )
      $util.qr($condition.put("expression", "$condition.expression AND attribute_exists(#keyCondition$velocityCount)"))
      $util.qr($condition.expressionNames.put("#keyCondition$velocityCount", "$entry.key"))
    #end
  #else
    $util.qr($condition.put("expression", "$condition.expression AND attribute_exists(#id)"))
    $util.qr($condition.expressionNames.put("#id", "id"))
  #end
#else
  #if( $modelObjectKey )
    #set( $condition = {
  "expression": "",
  "expressionNames": {},
  "expressionValues": {}
} )
    #foreach( $entry in $modelObjectKey.entrySet() )
      #if( $velocityCount == 1 )
        $util.qr($condition.put("expression", "attribute_exists(#keyCondition$velocityCount)"))
      #else
        $util.qr($condition.put("expression", "$condition.expression AND attribute_exists(#keyCondition$velocityCount)"))
      #end
      $util.qr($condition.expressionNames.put("#keyCondition$velocityCount", "$entry.key"))
    #end
  #else
    #set( $condition = {
  "expression": "attribute_exists(#id)",
  "expressionNames": {
      "#id": "id"
  },
  "expressionValues": {}
} )
  #end
#end
#############長文のため一部省略して記載しております#############
{
  "version": "2018-05-29",
  "operation": "UpdateItem",
  "key": #if( $modelObjectKey ) $util.toJson($modelObjectKey) #else {
  "id": {
      "S": $util.toJson($context.args.input.id)
  }
} #end,
  "update": $util.toJson($update),
  "condition": $util.toJson($condition)
}

type Todo @model 
  @auth(rules: [{ allow: owner }]) {
  id: ID! 
  name: String!
  owner: String
  description: String!
  updatedAt: AWSDateTime 
  createdAt: AWSDateTime 
}

## [Start] Determine request authentication mode **
#if( $util.isNullOrEmpty($authMode) && !$util.isNull($ctx.identity) && !$util.isNull($ctx.identity.sub) && !$util.isNull($ctx.identity.issuer) && !$util.isNull($ctx.identity.username) && !$util.isNull($ctx.identity.claims) && !$util.isNull($ctx.identity.sourceIp) && !$util.isNull($ctx.identity.defaultAuthStrategy) )
  #set( $authMode = "userPools" )
#end
## [End] Determine request authentication mode **
## [Start] Check authMode and execute owner/group checks **
#if( $authMode == "userPools" )
  ## No Static Group Authorization Rules **


  #if( ! $isStaticGroupAuthorized )
    ## No dynamic group authorization rules **


    ## [Start] Owner Authorization Checks **
    #set( $ownerAuthExpressions = [] )
    #set( $ownerAuthExpressionValues = {} )
    #set( $ownerAuthExpressionNames = {} )
    ## Authorization rule: { allow: owner, ownerField: "owner", identityClaim: "cognito:username" } **
    $util.qr($ownerAuthExpressions.add("#owner0 = :identity0"))
    $util.qr($ownerAuthExpressionNames.put("#owner0", "owner"))
    $util.qr($ownerAuthExpressionValues.put(":identity0", $util.dynamodb.toDynamoDB($util.defaultIfNull($ctx.identity.claims.get("username"), $util.defaultIfNull($ctx.identity.claims.get("cognito:username"), "___xamznone____")))))
    ## [End] Owner Authorization Checks **


    ## [Start] Collect Auth Condition **
    #set( $authCondition = $util.defaultIfNull($authCondition, {
  "expression": "",
  "expressionNames": {},
  "expressionValues": {}
}) )
    #set( $totalAuthExpression = "" )
    ## Add dynamic group auth conditions if they exist **
    #if( $groupAuthExpressions )
      #foreach( $authExpr in $groupAuthExpressions )
        #set( $totalAuthExpression = "$totalAuthExpression $authExpr" )
        #if( $foreach.hasNext )
          #set( $totalAuthExpression = "$totalAuthExpression OR" )
        #end
      #end
    #end
    #if( $groupAuthExpressionNames )
      $util.qr($authCondition.expressionNames.putAll($groupAuthExpressionNames))
    #end
    #if( $groupAuthExpressionValues )
      $util.qr($authCondition.expressionValues.putAll($groupAuthExpressionValues))
    #end
    ## Add owner auth conditions if they exist **
    #if( $totalAuthExpression != "" && $ownerAuthExpressions && $ownerAuthExpressions.size() > 0 )
      #set( $totalAuthExpression = "$totalAuthExpression OR" )
    #end
    #if( $ownerAuthExpressions )
      #foreach( $authExpr in $ownerAuthExpressions )
        #set( $totalAuthExpression = "$totalAuthExpression $authExpr" )
        #if( $foreach.hasNext )
          #set( $totalAuthExpression = "$totalAuthExpression OR" )
        #end
      #end
    #end
    #if( $ownerAuthExpressionNames )
      $util.qr($authCondition.expressionNames.putAll($ownerAuthExpressionNames))
    #end
    #if( $ownerAuthExpressionValues )
      $util.qr($authCondition.expressionValues.putAll($ownerAuthExpressionValues))
    #end
    ## Set final expression if it has changed. **
    #if( $totalAuthExpression != "" )
      #if( $util.isNullOrEmpty($authCondition.expression) )
        #set( $authCondition.expression = "($totalAuthExpression)" )
      #else
        #set( $authCondition.expression = "$authCondition.expression AND ($totalAuthExpression)" )
      #end
    #end
    ## [End] Collect Auth Condition **
  #end


  ## [Start] Throw if unauthorized **
  #if( !($isStaticGroupAuthorized == true || ($totalAuthExpression != "")) )
    $util.unauthorized()
  #end
  ## [End] Throw if unauthorized **
#end
## [End] Check authMode and execute owner/group checks **

{
  "version": "2018-05-29",
  "operation": "GetItem",
  "key": #if( $modelObjectKey ) $util.toJson($modelObjectKey) #else {
  "id": $util.dynamodb.toDynamoDBJson($ctx.args.id)
} #end
}

type Item @model
  @key(fields: ["orderId", "status", "createdAt"])
  @key(name: "ByStatus", fields: ["status", "createdAt"], queryField: "itemsByStatus") {
  orderId: ID!
  status: Status!
  createdAt: AWSDateTime!
  name: String!
}

enum Status {
  DELIVERED
  IN_TRANSIT
  PENDING
  UNKNOWN
}

## [Start] Set the primary @key. **
#set( $modelObjectKey = {
  "orderId": $util.dynamodb.toDynamoDB($ctx.args.orderId),
  "status#createdAt": $util.dynamodb.toDynamoDB("${ctx.args.status}#${ctx.args.createdAt}")
} )
## [End] Set the primary @key. **
{
  "version": "2018-05-29",
  "operation": "GetItem",
  "key": #if( $modelObjectKey ) $util.toJson($modelObjectKey) #else {
  "id": $util.dynamodb.toDynamoDBJson($ctx.args.id)
} #end
}

#if( $ctx.error )
$util.error($ctx.error.message, $ctx.error.type)
#else
$util.toJson($ctx.result)
#end