Validate variable usages are allowed in arguments
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@ -11,6 +11,7 @@ and this project adheres to
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- `Validate.Rules`:
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- `overlappingFieldsCanBeMergedRule`
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- `possibleFragmentSpreadsRule`
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- `variablesInAllowedPositionRule`
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- `Type.Schema.implementations` contains a map from interfaces and objects to
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interfaces they implement.
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- Show instances for GraphQL type definitions in the `Type` modules.
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@ -37,6 +37,7 @@ module Language.GraphQL.Validate.Rules
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, uniqueInputFieldNamesRule
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, uniqueOperationNamesRule
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, uniqueVariableNamesRule
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, variablesInAllowedPositionRule
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, variablesAreInputTypesRule
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) where
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@ -45,13 +46,13 @@ import Control.Monad.Trans.Class (MonadTrans(..))
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import Control.Monad.Trans.Reader (ReaderT(..), ask, asks, mapReaderT)
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import Control.Monad.Trans.State (StateT, evalStateT, gets, modify)
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import Data.Bifunctor (first)
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import Data.Foldable (find, foldl', toList)
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import Data.Foldable (find, fold, foldl', toList)
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import qualified Data.HashMap.Strict as HashMap
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import Data.HashMap.Strict (HashMap)
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import Data.HashSet (HashSet)
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import qualified Data.HashSet as HashSet
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import Data.List (groupBy, sortBy, sortOn)
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import Data.Maybe (fromMaybe, isNothing, mapMaybe)
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import Data.Maybe (catMaybes, fromMaybe, isJust, isNothing, mapMaybe)
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import Data.List.NonEmpty (NonEmpty(..))
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import Data.Ord (comparing)
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import Data.Sequence (Seq(..), (|>))
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@ -108,6 +109,7 @@ specifiedRules =
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, variablesAreInputTypesRule
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, noUndefinedVariablesRule
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, noUnusedVariablesRule
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, variablesInAllowedPositionRule
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]
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-- | Definition must be OperationDefinition or FragmentDefinition.
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@ -651,12 +653,9 @@ variableUsageDifference difference errorMessage = OperationDefinitionRule $ \cas
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lift $ lift $ mapArguments arguments <> mapDirectives directives'
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variableFilter (Full.FragmentSpreadSelection spread)
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| Full.FragmentSpread fragmentName _ _ <- spread = do
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definitions <- lift $ asks ast
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visited <- gets (HashSet.member fragmentName)
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modify (HashSet.insert fragmentName)
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case find (isSpreadTarget fragmentName) definitions of
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Just (viewFragment -> Just fragmentDefinition)
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| not visited -> diveIntoSpread fragmentDefinition
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nonVisitedFragmentDefinition <- visitFragmentDefinition fragmentName
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case nonVisitedFragmentDefinition of
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Just fragmentDefinition -> diveIntoSpread fragmentDefinition
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_ -> lift $ lift mempty
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diveIntoSpread (Full.FragmentDefinition _ _ directives' selections _)
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= filterSelections' selections
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@ -1286,3 +1285,199 @@ findSpreadTarget fragmentName = do
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let Full.FragmentDefinition _ typeCondition _ _ _ = fragmentDefinition
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in Just typeCondition
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extractTypeCondition _ = Nothing
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visitFragmentDefinition :: forall m
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. Text
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-> ValidationState m (Maybe Full.FragmentDefinition)
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visitFragmentDefinition fragmentName = do
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definitions <- lift $ asks ast
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visited <- gets (HashSet.member fragmentName)
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modify (HashSet.insert fragmentName)
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case find (isSpreadTarget fragmentName) definitions of
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Just (viewFragment -> Just fragmentDefinition)
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| not visited -> pure $ Just fragmentDefinition
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_ -> pure Nothing
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-- | Variable usages must be compatible with the arguments they are passed to.
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--
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-- Validation failures occur when variables are used in the context of types
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-- that are complete mismatches, or if a nullable type in a variable is passed
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-- to a non‐null argument type.
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variablesInAllowedPositionRule :: forall m. Rule m
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variablesInAllowedPositionRule = OperationDefinitionRule $ \case
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Full.OperationDefinition operationType _ variables _ selectionSet _ -> do
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schema' <- asks schema
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let root = go variables (toList selectionSet) . Type.CompositeObjectType
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case operationType of
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Full.Query -> root $ Schema.query schema'
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Full.Mutation
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| Just objectType <- Schema.mutation schema' -> root objectType
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Full.Subscription
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| Just objectType <- Schema.mutation schema' -> root objectType
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_ -> lift mempty
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_ -> lift mempty
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where
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go variables selections selectionType = mapReaderT (foldr (<>) Seq.empty)
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$ flip evalStateT HashSet.empty
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$ visitSelectionSet variables selectionType
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$ toList selections
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visitSelectionSet :: Foldable t
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=> [Full.VariableDefinition]
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-> Type.CompositeType m
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-> t Full.Selection
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-> ValidationState m (Seq Error)
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visitSelectionSet variables selectionType selections =
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foldM (evaluateSelection variables selectionType) mempty selections
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evaluateSelection :: [Full.VariableDefinition]
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-> Type.CompositeType m
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-> Seq Error
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-> Full.Selection
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-> ValidationState m (Seq Error)
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evaluateSelection variables selectionType accumulator selection
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| Full.FragmentSpreadSelection spread <- selection
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, Full.FragmentSpread fragmentName _ _ <- spread = do
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types' <- lift $ asks $ Schema.types . schema
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nonVisitedFragmentDefinition <- visitFragmentDefinition fragmentName
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case nonVisitedFragmentDefinition of
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Just fragmentDefinition
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| Full.FragmentDefinition _ typeCondition _ _ _ <- fragmentDefinition
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, Just spreadType <- Type.lookupTypeCondition typeCondition types' -> do
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a <- spreadVariables variables spread
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b <- diveIntoSpread variables spreadType fragmentDefinition
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pure $ accumulator <> a <> b
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_ -> lift $ lift mempty
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| Full.FieldSelection fieldSelection <- selection
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, Full.Field _ fieldName _ _ subselections _ <- fieldSelection =
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case Type.lookupCompositeField fieldName selectionType of
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Just (Out.Field _ typeField argumentTypes) -> do
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a <- fieldVariables variables argumentTypes fieldSelection
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case Type.outToComposite typeField of
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Just newParentType -> do
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b <- foldM (evaluateSelection variables newParentType) accumulator subselections
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pure $ accumulator <> a <> b
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Nothing -> pure $ accumulator <> a
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Nothing -> pure accumulator
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| Full.InlineFragmentSelection inlineSelection <- selection
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, Full.InlineFragment typeCondition _ subselections _ <- inlineSelection = do
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types' <- lift $ asks $ Schema.types . schema
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let inlineType = fromMaybe selectionType
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$ typeCondition
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>>= flip Type.lookupTypeCondition types'
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a <- inlineVariables variables inlineSelection
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b <- foldM (evaluateSelection variables inlineType) accumulator subselections
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pure $ accumulator <> a <> b
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inlineVariables variables inline
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| Full.InlineFragment _ directives' _ _ <- inline =
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mapDirectives variables directives'
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fieldVariables :: [Full.VariableDefinition]
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-> In.Arguments
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-> Full.Field
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-> ValidationState m (Seq Error)
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fieldVariables variables argumentTypes fieldSelection = do
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let Full.Field _ _ arguments directives' _ _ = fieldSelection
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argumentErrors <- mapArguments variables argumentTypes arguments
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directiveErrors <- mapDirectives variables directives'
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pure $ argumentErrors <> directiveErrors
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spreadVariables variables (Full.FragmentSpread _ directives' _) =
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mapDirectives variables directives'
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diveIntoSpread variables fieldType fragmentDefinition = do
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let Full.FragmentDefinition _ _ directives' selections _ =
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fragmentDefinition
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selectionErrors <- visitSelectionSet variables fieldType selections
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directiveErrors <- mapDirectives variables directives'
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pure $ selectionErrors <> directiveErrors
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findDirectiveVariables variables directive = do
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let Full.Directive directiveName arguments _ = directive
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directiveDefinitions <- lift $ asks $ Schema.directives . schema
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case HashMap.lookup directiveName directiveDefinitions of
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Just (Schema.Directive _ _ directiveArguments) ->
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mapArguments variables directiveArguments arguments
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Nothing -> pure mempty
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mapArguments variables argumentTypes
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= fmap (Seq.fromList . catMaybes)
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. traverse (findArgumentVariables variables argumentTypes)
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mapDirectives variables = fmap fold
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<$> traverse (findDirectiveVariables variables)
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findArgumentVariables variables argumentTypes argument
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| Full.Argument argumentName argumentValue _ <- argument
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, Full.Node{ node = Full.Variable variableName, ..} <- argumentValue
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, Just expectedType <- HashMap.lookup argumentName argumentTypes
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, findVariableDefinition' <- findVariableDefinition variableName
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, Just variableDefinition <- find findVariableDefinition' variables =
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isVariableUsageAllowed expectedType variableDefinition
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| otherwise = pure Nothing
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findVariableDefinition variableName variableDefinition =
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let Full.VariableDefinition variableName' _ _ _ = variableDefinition
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in variableName == variableName'
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isVariableUsageAllowed (In.Argument _ locationType locationDefaultValue) variableDefinition@(Full.VariableDefinition _ variableType variableDefaultValue _)
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| Full.TypeNonNull _ <- variableType =
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typesCompatibleOrError variableDefinition locationType
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| Just nullableLocationType <- unwrapInType locationType
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, hasNonNullVariableDefaultValue' <- hasNonNullVariableDefaultValue variableDefaultValue
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, hasLocationDefaultValue <- isJust locationDefaultValue =
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if hasNonNullVariableDefaultValue' || hasLocationDefaultValue
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then typesCompatibleOrError variableDefinition nullableLocationType
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else pure $ Just $ makeError variableDefinition locationType
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| otherwise = typesCompatibleOrError variableDefinition locationType
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typesCompatibleOrError variableDefinition locationType
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| Full.VariableDefinition _ variableType _ _ <- variableDefinition
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, areTypesCompatible variableType locationType = pure Nothing
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| otherwise = pure $ Just $ makeError variableDefinition locationType
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areTypesCompatible (Full.TypeNonNull nonNullType) (unwrapInType -> Just nullableLocationType) =
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case nonNullType of
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Full.NonNullTypeNamed n ->
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areTypesCompatible (Full.TypeNamed n) nullableLocationType
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Full.NonNullTypeList n ->
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areTypesCompatible (Full.TypeList n) nullableLocationType
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areTypesCompatible _ (In.isNonNullType -> True) = False
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areTypesCompatible (Full.TypeNonNull nonNullType) locationType
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| Full.NonNullTypeNamed namedType <- nonNullType =
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areTypesCompatible (Full.TypeNamed namedType) locationType
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| Full.NonNullTypeList namedType <- nonNullType =
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areTypesCompatible (Full.TypeList namedType) locationType
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areTypesCompatible variableType locationType
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| Full.TypeList itemVariableType <- variableType
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, In.ListType itemLocationType <- locationType =
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areTypesCompatible itemVariableType itemLocationType
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| areIdentical variableType locationType = True
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| otherwise = False
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areIdentical (Full.TypeList typeList) (In.ListType itemLocationType) =
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areIdentical typeList itemLocationType
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areIdentical (Full.TypeNonNull nonNullType) locationType
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| Full.NonNullTypeList nonNullList <- nonNullType
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, In.NonNullListType itemLocationType <- locationType =
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areIdentical nonNullList itemLocationType
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| Full.NonNullTypeNamed _ <- nonNullType
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, In.ListBaseType _ <- locationType = False
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| Full.NonNullTypeNamed nonNullList <- nonNullType
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, In.isNonNullType locationType =
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nonNullList == inputTypeName locationType
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areIdentical (Full.TypeNamed _) (In.ListBaseType _) = False
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areIdentical (Full.TypeNamed typeNamed) locationType
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| not $ In.isNonNullType locationType =
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typeNamed == inputTypeName locationType
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areIdentical _ _ = False
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hasNonNullVariableDefaultValue (Just (Full.Node Full.ConstNull _)) = False
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hasNonNullVariableDefaultValue Nothing = False
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hasNonNullVariableDefaultValue _ = True
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unwrapInType (In.NonNullScalarType nonNullType) =
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Just $ In.NamedScalarType nonNullType
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unwrapInType (In.NonNullEnumType nonNullType) =
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Just $ In.NamedEnumType nonNullType
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unwrapInType (In.NonNullInputObjectType nonNullType) =
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Just $ In.NamedInputObjectType nonNullType
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unwrapInType (In.NonNullListType nonNullType) =
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Just $ In.ListType nonNullType
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unwrapInType _ = Nothing
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makeError (Full.VariableDefinition variableName variableType _ location') expectedType = Error
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{ message = concat
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[ "Variable \"$"
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, Text.unpack variableName
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, "\" of type \""
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, show variableType
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, "\" used in position expecting type \""
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, show expectedType
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, "\"."
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]
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, locations = [location']
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}
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@ -1,4 +1,4 @@
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resolver: lts-16.26
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resolver: lts-16.27
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packages:
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- .
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@ -485,7 +485,7 @@ spec =
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"Variable \"$dog\" cannot be non-input type \"Dog\"."
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, locations = [AST.Location 2 34]
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}
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in validate queryString `shouldBe` [expected]
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in validate queryString `shouldContain` [expected]
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it "rejects undefined variables" $
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let queryString = [r|
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@ -808,3 +808,35 @@ spec =
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, locations = [AST.Location 4 19]
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}
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in validate queryString `shouldBe` [expected]
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it "wrongly typed variable arguments" $
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let queryString = [r|
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query catCommandArgQuery($catCommandArg: CatCommand) {
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cat {
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doesKnowCommand(catCommand: $catCommandArg)
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}
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}
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|]
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expected = Error
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{ message =
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"Variable \"$catCommandArg\" of type \"CatCommand\" \
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\used in position expecting type \"!CatCommand\"."
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, locations = [AST.Location 2 40]
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}
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in validate queryString `shouldBe` [expected]
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it "wrongly typed variable arguments" $
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let queryString = [r|
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query intCannotGoIntoBoolean($intArg: Int) {
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dog {
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isHousetrained(atOtherHomes: $intArg)
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}
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}
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|]
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expected = Error
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{ message =
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"Variable \"$intArg\" of type \"Int\" used in position \
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\expecting type \"Boolean\"."
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, locations = [AST.Location 2 44]
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}
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in validate queryString `shouldBe` [expected]
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