mirror of
https://github.com/hasura/graphql-engine.git
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336 lines
10 KiB
Haskell
336 lines
10 KiB
Haskell
module Hasura.GraphQL.Validate.Field
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( ArgsMap
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, Field(..)
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, SelSet
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, denormSelSet
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) where
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import Hasura.Prelude
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import qualified Data.Aeson as J
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import qualified Data.Aeson.Casing as J
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import qualified Data.Aeson.TH as J
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import qualified Data.HashMap.Strict as Map
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import qualified Data.HashMap.Strict.InsOrd.Extended as OMap
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import qualified Data.List as L
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import qualified Data.Sequence as Seq
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import qualified Data.Sequence.NonEmpty as NE
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import qualified Data.Text as T
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import qualified Language.GraphQL.Draft.Syntax as G
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import Hasura.GraphQL.Validate.Context
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import Hasura.GraphQL.Validate.InputValue
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import Hasura.GraphQL.Validate.Types
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import Hasura.RQL.Types
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import Hasura.SQL.Value
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-- data ScalarInfo
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-- = SIBuiltin !GBuiltin
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-- | SICustom !PGColType
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-- deriving (Show, Eq)
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-- data GBuiltin
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-- = GInt
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-- | GFloat
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-- | GBoolean
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-- | GString
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-- deriving (Show, Eq)
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data TypedOperation
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= TypedOperation
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{ _toType :: !G.OperationType
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, _toName :: !(Maybe G.Name)
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, _toSelectionSet :: ![Field]
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} deriving (Show, Eq)
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type ArgsMap = Map.HashMap G.Name AnnInpVal
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type SelSet = Seq.Seq Field
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data Field
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= Field
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{ _fAlias :: !G.Alias
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, _fName :: !G.Name
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, _fType :: !G.NamedType
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, _fArguments :: !ArgsMap
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, _fSelSet :: !SelSet
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} deriving (Eq, Show)
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$(J.deriveToJSON (J.aesonDrop 2 J.camelCase){J.omitNothingFields=True}
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''Field
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)
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-- newtype FieldMapAlias
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-- = FieldMapAlias
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-- { unFieldMapAlias :: Map.HashMap G.Alias (FieldG FieldMapAlias)
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-- } deriving (Show, Eq)
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-- newtype FieldMapName
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-- = FieldMapName
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-- { unFieldMapName :: Map.HashMap G.Name (NE.NonEmpty (FieldG FieldMapName))
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-- } deriving (Show, Eq)
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-- type Field = FieldG FieldMapAlias
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-- type FieldGrouped = FieldG FieldMapName
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-- toFieldGrouped :: Field -> FieldGrouped
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-- toFieldGrouped =
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-- fmap groupFields
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-- where
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-- groupFields m =
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-- FieldMapName $ groupTuples $
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-- flip map (Map.elems $ unFieldMapAlias m) $ \fld ->
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-- (_fName fld, toFieldGrouped fld)
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data FieldGroupSrc
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= FGSFragSprd !G.Name
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| FGSInlnFrag
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deriving (Show, Eq)
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data FieldGroup
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= FieldGroup
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{ _fgSource :: !FieldGroupSrc
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, _fgFields :: !(Seq.Seq Field)
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} deriving (Show, Eq)
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-- data GLoc
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-- = GLoc
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-- { _glLine :: !Int
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-- , _glColumn :: !Int
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-- } deriving (Show, Eq)
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-- data GErr
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-- = GErr
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-- { _geMessage :: !Text
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-- , _geLocations :: ![GLoc]
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-- } deriving (Show, Eq)
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-- throwGE :: (MonadError QErr m) => Text -> m a
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-- throwGE msg = throwError $ QErr msg []
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withDirectives
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:: ( MonadReader ValidationCtx m
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, MonadError QErr m)
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=> [G.Directive]
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-> m a
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-> m (Maybe a)
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withDirectives dirs act = do
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dirDefs <- onLeft (mkMapWith G._dName dirs) $ \dups ->
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throwVE $ "the following directives are used more than once: " <>
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showNames dups
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procDirs <- flip Map.traverseWithKey dirDefs $ \name dir ->
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withPathK (G.unName name) $ do
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dirInfo <- onNothing (Map.lookup (G._dName dir) defDirectivesMap) $
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throwVE $ "unexpected directive: " <> showName name
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procArgs <- withPathK "args" $ processArgs (_diParams dirInfo)
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(G._dArguments dir)
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getIfArg procArgs
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let shouldSkip = fromMaybe False $ Map.lookup "skip" procDirs
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shouldInclude = fromMaybe True $ Map.lookup "include" procDirs
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if not shouldSkip && shouldInclude
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then Just <$> act
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else return Nothing
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where
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getIfArg m = do
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val <- onNothing (Map.lookup "if" m) $ throw500
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"missing if argument in the directive"
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case _aivValue val of
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AGScalar _ (Just (PGValBoolean v)) -> return v
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_ -> throw500 "did not find boolean scalar for if argument"
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denormSel
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:: ( MonadReader ValidationCtx m
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, MonadError QErr m)
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=> [G.Name] -- visited fragments
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-> ObjTyInfo -- parent type info
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-> G.Selection
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-> m (Maybe (Either Field FieldGroup))
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denormSel visFrags parObjTyInfo sel = case sel of
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G.SelectionField fld -> withPathK (G.unName $ G._fName fld) $ do
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fldInfo <- getFieldInfo parObjTyInfo $ G._fName fld
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fmap Left <$> denormFld visFrags fldInfo fld
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G.SelectionFragmentSpread fragSprd ->
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withPathK (G.unName $ G._fsName fragSprd) $
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fmap Right <$> denormFrag visFrags parTy fragSprd
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G.SelectionInlineFragment inlnFrag ->
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withPathK "inlineFragment" $
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fmap Right <$> denormInlnFrag visFrags parObjTyInfo inlnFrag
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where
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parTy = _otiName parObjTyInfo
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processArgs
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:: ( MonadReader ValidationCtx m
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, MonadError QErr m)
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=> ParamMap
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-> [G.Argument]
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-> m ArgsMap
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processArgs fldParams argsL = do
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args <- onLeft (mkMapWith G._aName argsL) $ \dups ->
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throwVE $ "the following arguments are defined more than once: " <>
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showNames dups
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let requiredParams = Map.filter (G.isNotNull . _iviType) fldParams
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inpArgs <- forM args $ \(G.Argument argName argVal) ->
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withPathK (G.unName argName) $ do
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argTy <- getArgTy argName
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validateInputValue valueParser argTy argVal
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forM_ requiredParams $ \argDef -> do
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let param = _iviName argDef
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onNothing (Map.lookup param inpArgs) $ throwVE $ mconcat
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[ "the required argument ", showName param, " is missing"]
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return inpArgs
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where
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getArgTy argName =
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onNothing (_iviType <$> Map.lookup argName fldParams) $ throwVE $
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"no such argument " <> showName argName <> " is expected"
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denormFld
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:: ( MonadReader ValidationCtx m
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, MonadError QErr m)
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=> [G.Name] -- visited fragments
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-> ObjFldInfo
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-> G.Field
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-> m (Maybe Field)
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denormFld visFrags fldInfo (G.Field aliasM name args dirs selSet) = do
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let fldTy = _fiTy fldInfo
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fldBaseTy = getBaseTy fldTy
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fldTyInfo <- getTyInfo fldBaseTy
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argMap <- withPathK "args" $ processArgs (_fiParams fldInfo) args
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fields <- case (fldTyInfo, selSet) of
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(TIObj _, []) ->
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throwVE $ "field " <> showName name <> " of type "
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<> G.showGT fldTy <> " must have a selection of subfields"
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(TIObj fldObjTyInfo, _) ->
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denormSelSet visFrags fldObjTyInfo selSet
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(TIScalar _, []) -> return Seq.empty
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(TIEnum _, []) -> return Seq.empty
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(TIInpObj _, _) ->
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throwVE $ "internal error: unexpected input type for field: "
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<> showName name
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-- when scalar/enum and no empty set
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(_, _) ->
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throwVE $ "field " <> showName name <> " must not have a "
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<> "selection since type " <> G.showGT fldTy <> " has no subfields"
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withPathK "directives" $ withDirectives dirs $ return $
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Field (fromMaybe (G.Alias name) aliasM) name fldBaseTy argMap fields
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denormInlnFrag
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:: ( MonadReader ValidationCtx m
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, MonadError QErr m)
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=> [G.Name] -- visited fragments
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-> ObjTyInfo -- type information of the field
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-> G.InlineFragment
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-> m (Maybe FieldGroup)
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denormInlnFrag visFrags fldTyInfo inlnFrag = do
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let fldTy = _otiName fldTyInfo
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let fragTy = fromMaybe fldTy tyM
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when (fldTy /= fragTy) $
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throwVE $ "inline fragment is expected on type " <>
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showNamedTy fldTy <> " but found " <> showNamedTy fragTy
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withPathK "directives" $ withDirectives directives $
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fmap (FieldGroup FGSInlnFrag) $ denormSelSet visFrags fldTyInfo selSet
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where
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G.InlineFragment tyM directives selSet = inlnFrag
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denormSelSet
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:: ( MonadReader ValidationCtx m
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, MonadError QErr m)
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=> [G.Name] -- visited fragments
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-> ObjTyInfo
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-> G.SelectionSet
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-> m (Seq.Seq Field)
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denormSelSet visFrags fldTyInfo selSet =
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withPathK "selectionSet" $ do
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resFlds <- catMaybes <$> mapM (denormSel visFrags fldTyInfo) selSet
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mergeFields $ foldl' flatten Seq.empty resFlds
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where
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flatten s (Left fld) = s Seq.|> fld
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flatten s (Right (FieldGroup _ flds)) =
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s Seq.>< flds
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mergeFields
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:: ( MonadReader ValidationCtx m
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, MonadError QErr m)
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=> Seq.Seq Field
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-> m (Seq.Seq Field)
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mergeFields flds =
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fmap Seq.fromList $ forM fldGroups $ \fieldGroup -> do
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newFld <- checkMergeability fieldGroup
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childFields <- mergeFields $ foldl' (\l f -> l Seq.>< _fSelSet f) Seq.empty
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$ NE.toSeq fieldGroup
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return $ newFld {_fSelSet = childFields}
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where
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fldGroups = OMap.elems $ OMap.groupListWith _fAlias flds
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-- can a group be merged?
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checkMergeability fldGroup = do
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let groupedFlds = toList $ NE.toSeq fldGroup
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fldNames = L.nub $ map _fName groupedFlds
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args = L.nub $ map _fArguments groupedFlds
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fld = NE.head fldGroup
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fldAl = _fAlias fld
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when (length fldNames > 1) $
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throwVE $ "cannot merge different fields under the same alias ("
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<> showName (G.unAlias fldAl) <> "): "
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<> showNames fldNames
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when (length args > 1) $
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throwVE $ "cannot merge fields with different arguments"
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<> " under the same alias: "
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<> showName (G.unAlias fldAl)
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return fld
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denormFrag
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:: ( MonadReader ValidationCtx m
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, MonadError QErr m)
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=> [G.Name] -- visited fragments
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-> G.NamedType -- parent type
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-> G.FragmentSpread
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-> m (Maybe FieldGroup)
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denormFrag visFrags parTy (G.FragmentSpread name directives) = do
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-- check for cycles
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when (name `elem` visFrags) $
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throwVE $ "cannot spread fragment " <> showName name
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<> " within itself via "
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<> T.intercalate "," (map G.unName visFrags)
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(FragDef _ fragTyInfo selSet) <- getFragInfo
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let fragTy = _otiName fragTyInfo
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-- we don't have unions or interfaces so we can get away with equality
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when (fragTy /= parTy) $
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throwVE $ "cannot spread fragment " <> showName name <> " defined on " <>
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showNamedTy fragTy <> " when selecting fields of type " <> showNamedTy parTy
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resFlds <- denormSelSet (name:visFrags) fragTyInfo selSet
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withPathK "directives" $ withDirectives directives $
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return $ FieldGroup (FGSFragSprd name) resFlds
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where
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getFragInfo = do
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dctx <- ask
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onNothing (Map.lookup name $ _vcFragDefMap dctx) $
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throwVE $ "fragment '" <> G.unName name <> "' not found"
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