mirror of
https://github.com/hasura/graphql-engine.git
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e0c0043e76
PR-URL: https://github.com/hasura/graphql-engine-mono/pull/9284 GitOrigin-RevId: 2f2cf2ad01900a54e4bdb970205ac0ef313c7e00
376 lines
12 KiB
Haskell
376 lines
12 KiB
Haskell
-- |
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-- Description: Create/delete SQL functions to/from Hasura metadata.
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module Hasura.Function.API
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( FunctionPermissionArgument (..),
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SetFunctionCustomization (..),
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TrackFunction (..),
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TrackFunctionV2 (..),
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UnTrackFunction (..),
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doesFunctionPermissionExist,
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dropFunctionInMetadata,
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dropFunctionPermissionInMetadata,
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getSingleUniqueFunctionOverload,
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runCreateFunctionPermission,
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runDropFunctionPermission,
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runSetFunctionCustomization,
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runTrackFunc,
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runTrackFunctionV2,
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runUntrackFunc,
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trackFunctionP1,
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trackFunctionP2,
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)
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where
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import Control.Lens ((.~), (^.))
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import Data.Aeson
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import Data.HashMap.Strict qualified as HashMap
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import Data.HashMap.Strict.InsOrd qualified as InsOrdHashMap
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import Data.Text.Extended
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import Hasura.Base.Error
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import Hasura.EncJSON
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import Hasura.Function.Cache
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import Hasura.Function.Metadata (FunctionMetadata (..), fmConfiguration, fmPermissions)
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import Hasura.Prelude
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import Hasura.RQL.Types.Backend
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import Hasura.RQL.Types.BackendTag
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import Hasura.RQL.Types.BackendType
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import Hasura.RQL.Types.Common
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import Hasura.RQL.Types.Metadata
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import Hasura.RQL.Types.Metadata.Backend
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import Hasura.RQL.Types.Metadata.Instances ()
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import Hasura.RQL.Types.Metadata.Object
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import Hasura.RQL.Types.Roles (RoleName)
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import Hasura.RQL.Types.SchemaCache
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import Hasura.RQL.Types.SchemaCache.Build
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import Hasura.SQL.AnyBackend qualified as AB
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newtype TrackFunction b = TrackFunction {tfName :: FunctionName b}
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deriving instance (Backend b) => FromJSON (TrackFunction b)
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deriving instance (Backend b) => ToJSON (TrackFunction b)
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-- | Track function, Phase 1:
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-- Validate function tracking operation. Fails if function is already being
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-- tracked, or if a table with the same name is being tracked.
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trackFunctionP1 ::
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forall b m.
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(CacheRM m, QErrM m, Backend b) =>
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SourceName ->
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FunctionName b ->
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m ()
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trackFunctionP1 sourceName qf = do
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rawSchemaCache <- askSchemaCache
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unless (isJust $ AB.unpackAnyBackend @b =<< HashMap.lookup sourceName (scSources rawSchemaCache))
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$ throw400 NotExists
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$ sourceName
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<<> " is not a known "
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<> reify (backendTag @b)
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<<> " source"
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when (isJust $ unsafeFunctionInfo @b sourceName qf $ scSources rawSchemaCache)
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$ throw400 AlreadyTracked
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$ "function already tracked: "
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<>> qf
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let qt = functionToTable @b qf
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when (isJust $ unsafeTableInfo @b sourceName qt $ scSources rawSchemaCache)
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$ throw400 NotSupported
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$ "table with name "
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<> qf
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<<> " already exists"
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trackFunctionP2 ::
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forall b m.
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(MonadError QErr m, CacheRWM m, MetadataM m, BackendMetadata b) =>
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SourceName ->
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FunctionName b ->
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FunctionConfig b ->
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Maybe Text ->
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m EncJSON
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trackFunctionP2 sourceName qf config comment = do
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buildSchemaCacheFor
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(MOSourceObjId sourceName $ AB.mkAnyBackend $ SMOFunction @b qf)
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$ MetadataModifier
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$ metaSources
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. ix sourceName
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. toSourceMetadata
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. (smFunctions @b)
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%~ InsOrdHashMap.insert qf (FunctionMetadata qf config mempty comment)
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pure successMsg
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getSingleUniqueFunctionOverload ::
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forall b m.
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(QErrM m, Backend b) =>
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FunctionName b ->
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FunctionOverloads b ->
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m (RawFunctionInfo b)
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getSingleUniqueFunctionOverload qf = \case
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FunctionOverloads (fi :| []) -> return fi
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_ -> throw400 NotSupported $ "function " <> qf <<> " is overloaded. Overloaded functions are not supported"
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runTrackFunc ::
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forall b m.
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(MonadError QErr m, CacheRWM m, MetadataM m, BackendMetadata b) =>
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TrackFunction b ->
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m EncJSON
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runTrackFunc (TrackFunction qf) = do
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-- v1 track_function lacks a means to take extra arguments
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trackFunctionP1 @b defaultSource qf
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trackFunctionP2 @b defaultSource qf emptyFunctionConfig Nothing
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-- | JSON API payload for v2 of 'track_function':
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--
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-- https://hasura.io/docs/latest/graphql/core/api-reference/schema-metadata-api/custom-functions.html#track-function-v2
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data TrackFunctionV2 (b :: BackendType) = TrackFunctionV2
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{ _tfv2Source :: SourceName,
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_tfv2Function :: FunctionName b,
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_tfv2Configuration :: FunctionConfig b,
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_tfv2Comment :: Maybe Text
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}
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instance (Backend b) => FromJSON (TrackFunctionV2 b) where
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parseJSON = withObject "TrackFunctionV2" $ \o ->
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TrackFunctionV2
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<$> o
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.:? "source"
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.!= defaultSource
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<*> o
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.: "function"
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<*> o
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.:? "configuration"
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.!= emptyFunctionConfig
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<*> o
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.:? "comment"
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runTrackFunctionV2 ::
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forall b m.
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(BackendMetadata b, QErrM m, CacheRWM m, MetadataM m) =>
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TrackFunctionV2 b ->
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m EncJSON
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runTrackFunctionV2 (TrackFunctionV2 source qf config comment) = do
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trackFunctionP1 @b source qf
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trackFunctionP2 @b source qf config comment
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-- | JSON API payload for 'untrack_function':
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--
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-- https://hasura.io/docs/latest/graphql/core/api-reference/schema-metadata-api/custom-functions.html#untrack-function
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data UnTrackFunction b = UnTrackFunction
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{ _utfFunction :: FunctionName b,
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_utfSource :: SourceName
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}
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instance (Backend b) => FromJSON (UnTrackFunction b) where
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-- Following was the previous implementation, which while seems to be correct,
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-- has an unexpected behaviour. In the case when @source@ key is present but
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-- @function@ key is absent, it would silently coerce it into a @default@
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-- source. The culprint being the _alternative_ operator, which silently fails
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-- the first parse. This note exists so that we don't try to simplify using
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-- the _alternative_ pattern here.
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-- Previous implementation :-
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-- Consider the following JSON -
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-- {
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-- "source": "custom_source",
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-- "schema": "public",
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-- "name": "my_function"
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-- }
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-- it silently fails parsing the source here because @function@ key is not
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-- present, and proceeds to parse using @withoutSource@ as default source. Now
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-- this is surprising for the user, because they mention @source@ key
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-- explicitly. A better behaviour is to explicitly look for @function@ key if
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-- a @source@ key is present.
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-- >>
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-- parseJSON v = withSource <|> withoutSource
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-- where
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-- withoutSource = UnTrackFunction <$> parseJSON v <*> pure defaultSource
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-- withSource = flip (withObject "UnTrackFunction") v \o -> do
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-- UnTrackFunction <$> o .: "function"
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-- <*> o .:? "source" .!= defaultSource
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parseJSON v = flip (withObject "UnTrackFunction") v $ \o -> do
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source <- o .:? "source"
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case source of
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Just src -> flip UnTrackFunction src <$> o .: "function"
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Nothing -> UnTrackFunction <$> parseJSON v <*> pure defaultSource
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runUntrackFunc ::
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forall b m.
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(CacheRWM m, MonadError QErr m, MetadataM m, BackendMetadata b) =>
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UnTrackFunction b ->
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m EncJSON
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runUntrackFunc (UnTrackFunction functionName sourceName) = do
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void $ askFunctionInfo @b sourceName functionName
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withNewInconsistentObjsCheck
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$ buildSchemaCache
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$ dropFunctionInMetadata @b sourceName functionName
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pure successMsg
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{- Note [Function Permissions]
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Before we started supporting tracking volatile functions, permissions
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for a function was inferred from the target table of the function.
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The rationale behind this is that a stable/immutable function does not
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modify the database and the data returned by the function is filtered using
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the permissions that are specified precisely for that data.
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Now consider mutable/volatile functions, we can't automatically infer whether or
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not these functions should be exposed for the sole reason that they can modify
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the database. This necessitates a permission system for functions.
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So, we introduce a new API `pg_create_function_permission` which will
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explicitly grant permission to a function to a role. For creating a
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function permission, the role must have select permissions configured
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for the target table.
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Since, this is a breaking change, we enable it only when the graphql-engine
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is started with
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`--infer-function-permissions`/HASURA_GRAPHQL_INFER_FUNCTION_PERMISSIONS set
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to false (by default, it's set to true).
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-}
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data FunctionPermissionArgument b = FunctionPermissionArgument
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{ _afpFunction :: FunctionName b,
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_afpSource :: SourceName,
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_afpRole :: RoleName
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}
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instance (Backend b) => FromJSON (FunctionPermissionArgument b) where
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parseJSON v =
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flip (withObject "FunctionPermissionArgument") v $ \o ->
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FunctionPermissionArgument
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<$> o
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.: "function"
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<*> o
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.:? "source"
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.!= defaultSource
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<*> o
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.: "role"
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runCreateFunctionPermission ::
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forall b m.
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( CacheRWM m,
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MonadError QErr m,
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MetadataM m,
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BackendMetadata b
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) =>
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FunctionPermissionArgument b ->
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m EncJSON
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runCreateFunctionPermission (FunctionPermissionArgument functionName source role) = do
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metadata <- getMetadata
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sourceCache <- scSources <$> askSchemaCache
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functionInfo <- askFunctionInfo @b source functionName
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when (doesFunctionPermissionExist @b metadata source functionName role)
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$ throw400 AlreadyExists
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$ "permission of role "
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<> role
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<<> " already exists for function "
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<> functionName
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<<> " in source: "
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<>> source
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(functionTableName, functionTableInfo) <- do
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let tn = _fiReturnType functionInfo
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case unsafeTableInfo @b source tn sourceCache of
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Nothing -> throw400 NotExists ("function's return table " <> tn <<> " not found in the cache")
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Just info -> pure (tn, info)
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unless (role `HashMap.member` _tiRolePermInfoMap functionTableInfo)
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$ throw400 NotSupported
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$ "function permission can only be added when the function's return table "
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<> functionTableName
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<<> " has select permission configured for role: "
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<>> role
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buildSchemaCacheFor
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( MOSourceObjId source
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$ AB.mkAnyBackend (SMOFunctionPermission @b functionName role)
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)
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$ MetadataModifier
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$ metaSources
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. ix
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source
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. toSourceMetadata
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. (smFunctions @b)
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. ix functionName
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. fmPermissions
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%~ (:) (FunctionPermissionInfo role)
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pure successMsg
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dropFunctionPermissionInMetadata ::
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forall b.
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(BackendMetadata b) =>
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SourceName ->
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FunctionName b ->
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RoleName ->
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MetadataModifier
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dropFunctionPermissionInMetadata source function role =
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MetadataModifier
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$ metaSources
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. ix source
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. toSourceMetadata
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. (smFunctions @b)
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. ix function
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. fmPermissions
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%~ filter ((/=) role . _fpmRole)
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doesFunctionPermissionExist :: forall b. (BackendMetadata b) => Metadata -> SourceName -> FunctionName b -> RoleName -> Bool
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doesFunctionPermissionExist metadata sourceName functionName roleName =
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any ((== roleName) . _fpmRole) $ metadata ^. (metaSources . ix sourceName . toSourceMetadata . (smFunctions @b) . ix functionName . fmPermissions)
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runDropFunctionPermission ::
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forall m b.
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( CacheRWM m,
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MonadError QErr m,
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MetadataM m,
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BackendMetadata b
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) =>
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FunctionPermissionArgument b ->
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m EncJSON
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runDropFunctionPermission (FunctionPermissionArgument functionName source role) = do
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metadata <- getMetadata
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unless (doesFunctionPermissionExist @b metadata source functionName role)
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$ throw400 NotExists
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$ "permission of role "
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<> role
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<<> " does not exist for function "
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<> functionName
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<<> " in source: "
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<>> source
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buildSchemaCacheFor
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( MOSourceObjId source
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$ AB.mkAnyBackend
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$ SMOFunctionPermission @b functionName role
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)
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$ dropFunctionPermissionInMetadata @b source functionName role
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pure successMsg
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-- | Represents the payload of the API command 'pg_set_function_customization'.
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--
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-- See the Hasura API reference for a detailed description.
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data SetFunctionCustomization b = SetFunctionCustomization
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{ _sfcSource :: SourceName,
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_sfcFunction :: FunctionName b,
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_sfcConfiguration :: FunctionConfig b
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}
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deriving instance (Backend b) => Show (SetFunctionCustomization b)
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deriving instance (Backend b) => Eq (SetFunctionCustomization b)
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instance (Backend b) => FromJSON (SetFunctionCustomization b) where
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parseJSON = withObject "set function customization" $ \o ->
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SetFunctionCustomization
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<$> o
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.:? "source"
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.!= defaultSource
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<*> o
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.: "function"
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<*> o
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.: "configuration"
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-- | Changes the custom names of a function. Used in the API command 'pg_set_function_customization'.
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runSetFunctionCustomization ::
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forall b m.
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(QErrM m, CacheRWM m, MetadataM m, Backend b) =>
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SetFunctionCustomization b ->
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m EncJSON
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runSetFunctionCustomization (SetFunctionCustomization source function config) = do
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void $ askFunctionInfo @b source function
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buildSchemaCacheFor
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(MOSourceObjId source $ AB.mkAnyBackend $ SMOFunction @b function)
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$ MetadataModifier
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$ ((functionMetadataSetter @b source function) . fmConfiguration)
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.~ config
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return successMsg
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