mirror of
https://github.com/hasura/graphql-engine.git
synced 2024-12-17 12:31:52 +03:00
358 lines
10 KiB
Haskell
358 lines
10 KiB
Haskell
{-# LANGUAGE DeriveLift #-}
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{-# LANGUAGE FlexibleContexts #-}
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{-# LANGUAGE FlexibleInstances #-}
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{-# LANGUAGE LambdaCase #-}
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{-# LANGUAGE MultiParamTypeClasses #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE QuasiQuotes #-}
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{-# LANGUAGE RankNTypes #-}
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{-# LANGUAGE TemplateHaskell #-}
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{-# LANGUAGE TypeApplications #-}
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{-# LANGUAGE TypeFamilies #-}
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{-# LANGUAGE TypeFamilyDependencies #-}
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module Hasura.RQL.DDL.Permission.Internal where
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import Control.Lens hiding ((.=))
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import Data.Aeson.Casing
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import Data.Aeson.TH
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import Data.Aeson.Types
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import Instances.TH.Lift ()
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import Language.Haskell.TH.Syntax (Lift)
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import qualified Data.HashMap.Strict as M
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import qualified Data.Text.Extended as T
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import Hasura.Prelude
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import Hasura.RQL.GBoolExp
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import Hasura.RQL.Types
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import Hasura.Server.Utils
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import Hasura.SQL.Types
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import qualified Database.PG.Query as Q
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import qualified Hasura.SQL.DML as S
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data PermColSpec
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= PCStar
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| PCCols ![PGCol]
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deriving (Show, Eq, Lift)
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instance FromJSON PermColSpec where
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parseJSON (String "*") = return PCStar
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parseJSON x = PCCols <$> parseJSON x
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instance ToJSON PermColSpec where
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toJSON (PCCols cols) = toJSON cols
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toJSON PCStar = "*"
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convColSpec :: FieldInfoMap -> PermColSpec -> [PGCol]
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convColSpec _ (PCCols cols) = cols
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convColSpec cim PCStar =
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map pgiName $ fst $ partitionEithers $
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map fieldInfoToEither $ M.elems cim
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assertPermNotDefined
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:: (MonadError QErr m)
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=> RoleName
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-> PermAccessor a
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-> TableInfo
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-> m ()
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assertPermNotDefined roleName pa tableInfo =
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when (permissionIsDefined rpi pa || roleName == adminRole)
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$ throw400 AlreadyExists $ mconcat
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[ "'" <> T.pack (show $ permAccToType pa) <> "'"
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, " permission on " <>> tiName tableInfo
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, " for role " <>> roleName
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, " already exists"
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]
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where
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rpi = M.lookup roleName $ tiRolePermInfoMap tableInfo
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permissionIsDefined
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:: Maybe RolePermInfo -> PermAccessor a -> Bool
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permissionIsDefined rpi pa =
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isJust $ join $ rpi ^? _Just.permAccToLens pa
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assertPermDefined
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:: (MonadError QErr m)
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=> RoleName
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-> PermAccessor a
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-> TableInfo
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-> m ()
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assertPermDefined roleName pa tableInfo =
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unless (permissionIsDefined rpi pa) $ throw400 PermissionDenied $ mconcat
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[ "'" <> T.pack (show $ permAccToType pa) <> "'"
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, " permission on " <>> tiName tableInfo
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, " for role " <>> roleName
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, " does not exist"
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]
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where
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rpi = M.lookup roleName $ tiRolePermInfoMap tableInfo
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askPermInfo
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:: (MonadError QErr m)
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=> TableInfo
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-> RoleName
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-> PermAccessor c
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-> m c
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askPermInfo tabInfo roleName pa =
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case M.lookup roleName rpim >>= (^. paL) of
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Just c -> return c
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Nothing -> throw400 PermissionDenied $ mconcat
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[ pt <> " permisison on " <>> tiName tabInfo
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, " for role " <>> roleName
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, " does not exist"
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]
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where
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paL = permAccToLens pa
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pt = permTypeToCode $ permAccToType pa
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rpim = tiRolePermInfoMap tabInfo
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savePermToCatalog
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:: (ToJSON a)
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=> PermType
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-> QualifiedTable
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-> PermDef a
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-> Q.TxE QErr ()
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savePermToCatalog pt (QualifiedTable sn tn) (PermDef rn qdef mComment) =
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Q.unitQE defaultTxErrorHandler [Q.sql|
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INSERT INTO
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hdb_catalog.hdb_permission
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(table_schema, table_name, role_name, perm_type, perm_def, comment)
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VALUES ($1, $2, $3, $4, $5 :: jsonb, $6)
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|] (sn, tn, rn, permTypeToCode pt, Q.AltJ qdef, mComment) True
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dropPermFromCatalog
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:: QualifiedTable
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-> RoleName
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-> PermType
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-> Q.TxE QErr ()
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dropPermFromCatalog (QualifiedTable sn tn) rn pt =
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Q.unitQE defaultTxErrorHandler [Q.sql|
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DELETE FROM
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hdb_catalog.hdb_permission
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WHERE
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table_schema = $1
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AND table_name = $2
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AND role_name = $3
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AND perm_type = $4
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|] (sn, tn, rn, permTypeToCode pt) True
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type CreatePerm a = WithTable (PermDef a)
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data PermDef a =
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PermDef
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{ pdRole :: !RoleName
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, pdPermission :: !a
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, pdComment :: !(Maybe T.Text)
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} deriving (Show, Eq, Lift)
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$(deriveFromJSON (aesonDrop 2 snakeCase){omitNothingFields=True} ''PermDef)
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instance (ToJSON a) => ToJSON (PermDef a) where
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toJSON = object . toAesonPairs
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instance (ToJSON a) => ToAesonPairs (PermDef a) where
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toAesonPairs (PermDef rn perm comment) =
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[ "role" .= rn
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, "permission" .= perm
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, "comment" .= comment
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]
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data CreatePermP1Res a
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= CreatePermP1Res
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{ cprInfo :: !a
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, cprDeps :: ![SchemaDependency]
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} deriving (Show, Eq)
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createPermP1 :: (P1C m) => QualifiedTable -> m TableInfo
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createPermP1 tn = do
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adminOnly
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askTabInfo tn
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procBoolExp
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:: (QErrM m, CacheRM m)
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=> QualifiedTable -> FieldInfoMap -> S.Qual -> BoolExp
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-> m (S.BoolExp, [SchemaDependency])
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procBoolExp tn fieldInfoMap tq be = do
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abe <- annBoolExp valueParser fieldInfoMap be
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sqlbe <- convFilterExp tq abe
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let deps = getBoolExpDeps tn abe
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return (sqlbe, deps)
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isReqUserId :: T.Text -> Bool
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isReqUserId = (== "req_user_id") . T.toLower
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getDependentHeaders :: BoolExp -> [T.Text]
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getDependentHeaders boolExp = case boolExp of
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BoolAnd exps -> concatMap getDependentHeaders exps
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BoolOr exps -> concatMap getDependentHeaders exps
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BoolCol (ColExp _ v) -> parseValue v
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BoolNot be -> getDependentHeaders be
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where
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parseValue val = case val of
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(Object o) -> parseObject o
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_ -> parseOnlyString val
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parseOnlyString val = case val of
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(String t)
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| isUserVar t -> [T.toLower t]
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| isReqUserId t -> [userIdHeader]
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| otherwise -> []
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_ -> []
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parseObject o = flip concatMap (M.toList o) $ \(k, v) ->
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bool (parseValue v) (parseOnlyString v) $ isRQLOp k
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valueParser :: (MonadError QErr m) => PGColType -> Value -> m S.SQLExp
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valueParser columnType = \case
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-- When it is a special variable
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val@(String t)
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| isUserVar t -> return $ fromCurSess t
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| isReqUserId t -> return $ fromCurSess userIdHeader
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| otherwise -> txtRHSBuilder columnType val
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-- Typical value as Aeson's value
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val -> txtRHSBuilder columnType val
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where
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curSess = S.SEUnsafe "current_setting('hasura.user')::json"
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fromCurSess hdr =
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S.SEOpApp (S.SQLOp "->>") [curSess, S.SELit $ T.toLower hdr]
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`S.SETyAnn` (S.AnnType $ T.pack $ show columnType)
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-- Convert where clause into SQL BoolExp
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convFilterExp :: (MonadError QErr m)
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=> S.Qual -> GBoolExp AnnValS -> m S.BoolExp
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convFilterExp tq be =
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cBoolExp <$> convBoolRhs builderStrategy tq be
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where
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builderStrategy = mkBoolExpBuilder return
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injectDefaults :: QualifiedTable -> QualifiedTable -> Q.Query
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injectDefaults qv qt =
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Q.fromText $ mconcat
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[ "SELECT hdb_catalog.inject_table_defaults("
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, pgFmtLit vsn
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, ", "
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, pgFmtLit vn
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, ", "
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, pgFmtLit tsn
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, ", "
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, pgFmtLit tn
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, ");"
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]
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where
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QualifiedTable (SchemaName vsn) (TableName vn) = qv
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QualifiedTable (SchemaName tsn) (TableName tn) = qt
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data DropPerm a
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= DropPerm
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{ dipTable :: !QualifiedTable
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, dipRole :: !RoleName
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} deriving (Show, Eq, Lift)
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$(deriveJSON (aesonDrop 3 snakeCase){omitNothingFields=True} ''DropPerm)
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type family PermInfo a = r | r -> a
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class (ToJSON a) => IsPerm a where
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type DropPermP1Res a
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permAccessor
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:: PermAccessor (PermInfo a)
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buildPermInfo
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:: (QErrM m, CacheRM m)
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=> TableInfo
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-> PermDef a
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-> m (PermInfo a)
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addPermP2Setup
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:: (MonadTx m, QErrM m) => QualifiedTable -> PermDef a -> PermInfo a -> m ()
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buildDropPermP1Res
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:: (QErrM m, CacheRM m, UserInfoM m)
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=> DropPerm a
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-> m (DropPermP1Res a)
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dropPermP2Setup
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:: (CacheRWM m, MonadTx m) => DropPerm a -> DropPermP1Res a -> m ()
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getPermAcc1
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:: PermDef a -> PermAccessor (PermInfo a)
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getPermAcc1 _ = permAccessor
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getPermAcc2
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:: DropPerm a -> PermAccessor (PermInfo a)
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getPermAcc2 _ = permAccessor
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validateViewPerm
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:: (IsPerm a, QErrM m) => PermDef a -> TableInfo -> m ()
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validateViewPerm permDef tableInfo =
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case permAcc of
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PASelect -> return ()
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PAInsert -> mutableView tn viIsInsertable viewInfo "insertable"
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PAUpdate -> mutableView tn viIsUpdatable viewInfo "updatable"
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PADelete -> mutableView tn viIsDeletable viewInfo "deletable"
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where
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tn = tiName tableInfo
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viewInfo = tiViewInfo tableInfo
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permAcc = getPermAcc1 permDef
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addPermP1 :: (QErrM m, CacheRM m, IsPerm a) => TableInfo -> PermDef a -> m (PermInfo a)
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addPermP1 tabInfo pd = do
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assertPermNotDefined (pdRole pd) (getPermAcc1 pd) tabInfo
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buildPermInfo tabInfo pd
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addPermP2 :: (IsPerm a, QErrM m, CacheRWM m, MonadTx m)
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=> QualifiedTable -> PermDef a -> PermInfo a -> m ()
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addPermP2 tn pd permInfo = do
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addPermP2Setup tn pd permInfo
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addPermToCache tn (pdRole pd) pa permInfo
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liftTx $ savePermToCatalog pt tn pd
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where
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pa = getPermAcc1 pd
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pt = permAccToType pa
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instance (IsPerm a) => HDBQuery (CreatePerm a) where
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type Phase1Res (CreatePerm a) = PermInfo a
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phaseOne (WithTable tn pd) = do
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tabInfo <- createPermP1 tn
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validateViewPerm pd tabInfo
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addPermP1 tabInfo pd
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phaseTwo (WithTable tn pd) permInfo = do
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addPermP2 tn pd permInfo
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return successMsg
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schemaCachePolicy = SCPReload
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dropPermP1 :: (QErrM m, CacheRM m, UserInfoM m, IsPerm a) => DropPerm a -> m (PermInfo a)
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dropPermP1 dp@(DropPerm tn rn) = do
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adminOnly
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tabInfo <- askTabInfo tn
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askPermInfo tabInfo rn $ getPermAcc2 dp
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dropPermP2
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:: (IsPerm a, QErrM m, CacheRWM m, MonadTx m)
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=> DropPerm a -> DropPermP1Res a -> m ()
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dropPermP2 dp@(DropPerm tn rn) p1Res = do
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dropPermP2Setup dp p1Res
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delPermFromCache pa rn tn
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liftTx $ dropPermFromCatalog tn rn pt
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where
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pa = getPermAcc2 dp
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pt = permAccToType pa
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instance (IsPerm a) => HDBQuery (DropPerm a) where
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type Phase1Res (DropPerm a) = DropPermP1Res a
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phaseOne = buildDropPermP1Res
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phaseTwo dp p1Res = dropPermP2 dp p1Res >> return successMsg
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schemaCachePolicy = SCPReload
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