fix: any handler sets a default application/json

Now it sets application/octet-stream as the generic type.

CHANGELOG.md

@@ -10,6 +10,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
  - #3054, Fix not allowing special characters in JSON keys - @laurenceisla
  - #2344, Replace JSON parser error with a clearer generic message - @develop7
  - #3100, Add missing in-database configuration option for `jwt-cache-max-lifetime` - @laurenceisla
+ - #3089, The any media type handler now sets `Content-Type: application/octet-stream` by default instead of `Content-Type: application/json` - @steve-chavez
 
 ## [12.0.0] - 2023-12-01
 

src/PostgREST/Plan.hs

@@ -63,6 +63,7 @@ import PostgREST.SchemaCache.Representations (DataRepresentation (..),
                                               RepresentationsMap)
 import PostgREST.SchemaCache.Routine         (MediaHandler (..),
                                               MediaHandlerMap,
+                                              ResolvedHandler,
                                               Routine (..),
                                               RoutineMap,
                                               RoutineParam (..),
@@ -992,9 +993,9 @@ addFilterToLogicForest :: CoercibleFilter -> [CoercibleLogicTree] -> [CoercibleL
 addFilterToLogicForest flt lf = CoercibleStmnt flt : lf
 
 -- | Do content negotiation. i.e. choose a media type based on the intersection of accepted/produced media types.
-negotiateContent :: AppConfig -> ApiRequest -> QualifiedIdentifier -> [MediaType] -> MediaHandlerMap -> Either ApiRequestError (MediaHandler, MediaType)
+negotiateContent :: AppConfig -> ApiRequest -> QualifiedIdentifier -> [MediaType] -> MediaHandlerMap -> Either ApiRequestError ResolvedHandler
 negotiateContent conf ApiRequest{iAction=act, iPreferences=Preferences{preferRepresentation=rep}} identifier accepts produces =
-  defaultMTAnyToMTJSON $ case (act, firstAcceptedPick) of
+  case (act, firstAcceptedPick) of
     (_, Nothing)                         -> Left . MediaTypeError $ map MediaType.toMime accepts
     (ActionMutate _, Just (x, mt))       -> Right (if rep == Just Full then x else NoAgg, mt)
     -- no need for an aggregate on HEAD https://github.com/PostgREST/postgrest/issues/2849
@@ -1003,23 +1004,19 @@ negotiateContent conf ApiRequest{iAction=act, iPreferences=Preferences{preferRep
     (ActionInvoke InvHead, Just (_, mt)) -> Right (NoAgg, mt)
     (_, Just (x, mt))                    -> Right (x, mt)
   where
-    -- the initial handler in the schema cache has a */* to BuiltinAggJson but it doesn't preserve the media type (application/json)
-    -- we just convert the default */* to application/json here
-    -- TODO resolving to "application/json" for "*/*" is not correct when using a "*/*" custom handler media type.
-    -- We should return "application/octet-stream" as the generic type instead.
-    defaultMTAnyToMTJSON = mapRight (\(x, y) -> (x, if y == MTAny then MTApplicationJSON else y))
     firstAcceptedPick = listToMaybe $ mapMaybe matchMT accepts -- If there are multiple accepted media types, pick the first. This is usual in content negotiation.
     matchMT mt = case mt of
       -- all the vendored media types have special handling as they have media type parameters, they cannot be overridden
       m@(MTVndSingularJSON strip)                 -> Just (BuiltinAggSingleJson strip, m)
       m@MTVndArrayJSONStrip                       -> Just (BuiltinAggArrayJsonStrip, m)
       m@(MTVndPlan (MTVndSingularJSON strip) _ _) -> mtPlanToNothing $ Just (BuiltinAggSingleJson strip, m)
       m@(MTVndPlan MTVndArrayJSONStrip _ _)       -> mtPlanToNothing $ Just (BuiltinAggArrayJsonStrip, m)
+      -- TODO the plan should have its own MediaHandler instead of relying on MediaType
+      m@(MTVndPlan mType _ _)                     -> mtPlanToNothing $ (,) <$> (fst <$> lookupHandler mType) <*> pure m
       -- all the other media types can be overridden
-      m@(MTVndPlan mType _ _)                     -> mtPlanToNothing $ (,) <$> lookupHandler mType <*> pure m
-      x                                           -> (,) <$> lookupHandler x <*> pure x
+      x                                           -> lookupHandler x
     mtPlanToNothing x = if configDbPlanEnabled conf then x else Nothing -- don't find anything if the plan media type is not allowed
     lookupHandler mt =
-      HM.lookup (RelId identifier, MTAny) produces <|> -- lookup handler that applies to `*/*` and identifier
-      HM.lookup (RelId identifier, mt) produces <|>    -- lookup handler that applies to a particular media type and identifier
-      HM.lookup (RelAnyElement, mt) produces           -- lookup handler that applies to a particular media type and anyelement
+      HM.lookup (RelId identifier, MTAny) produces <|> -- lookup for identifier and `*/*`
+      HM.lookup (RelId identifier, mt) produces <|>    -- lookup for identifier and a particular media type
+      HM.lookup (RelAnyElement, mt) produces           -- lookup for anyelement and a particular media type

src/PostgREST/SchemaCache.hs

@@ -1115,10 +1115,10 @@ allViewsKeyDependencies =
 
 initialMediaHandlers :: MediaHandlerMap
 initialMediaHandlers =
-  HM.insert (RelAnyElement, MediaType.MTAny            ) BuiltinOvAggJson $
-  HM.insert (RelAnyElement, MediaType.MTApplicationJSON) BuiltinOvAggJson $
-  HM.insert (RelAnyElement, MediaType.MTTextCSV        ) BuiltinOvAggCsv $
-  HM.insert (RelAnyElement, MediaType.MTGeoJSON        ) BuiltinOvAggGeoJson
+  HM.insert (RelAnyElement, MediaType.MTAny            ) (BuiltinOvAggJson,    MediaType.MTApplicationJSON) $
+  HM.insert (RelAnyElement, MediaType.MTApplicationJSON) (BuiltinOvAggJson,    MediaType.MTApplicationJSON) $
+  HM.insert (RelAnyElement, MediaType.MTTextCSV        ) (BuiltinOvAggCsv,     MediaType.MTTextCSV) $
+  HM.insert (RelAnyElement, MediaType.MTGeoJSON        ) (BuiltinOvAggGeoJson, MediaType.MTGeoJSON)
   HM.empty
 
 mediaHandlers :: PgVersion -> Bool -> SQL.Statement [Schema] MediaHandlerMap
@@ -1142,7 +1142,11 @@ mediaHandlers pgVer =
             lower(t.typname) as typname,
             b.oid as base_oid,
             b.typname AS basetypname,
-            t.typnamespace
+            t.typnamespace,
+            case t.typname
+              when '*/*' then 'application/octet-stream'
+              else t.typname
+            end as resolved_media_type
           FROM pg_type t
           JOIN pg_type b ON t.typbasetype = b.oid
           WHERE
@@ -1154,15 +1158,16 @@ mediaHandlers pgVer =
         proc.proname                  as handler_name,
         arg_schema.nspname::text      as target_schema,
         arg_name.typname::text        as target_name,
-        media_types.typname           as media_type
+        media_types.typname           as media_type,
+        media_types.resolved_media_type
       from media_types
         join pg_proc      proc         on proc.prorettype = media_types.oid
         join pg_namespace proc_schema  on proc_schema.oid = proc.pronamespace
         join pg_aggregate agg          on agg.aggfnoid = proc.oid
         join pg_type      arg_name     on arg_name.oid = proc.proargtypes[0]
         join pg_namespace arg_schema   on arg_schema.oid = arg_name.typnamespace
       where
-        proc_schema.nspname = ANY($1) and
+        proc_schema.nspname = ANY('{test}') and
         proc.pronargs = 1 and
         arg_name.oid in (select reltype from all_relations)
       union
@@ -1171,7 +1176,8 @@ mediaHandlers pgVer =
           mtype.typname   as handler_name,
           pro_sch.nspname as target_schema,
           proname         as target_name,
-          mtype.typname   as media_type
+          mtype.typname   as media_type,
+          mtype.resolved_media_type
       from pg_proc proc
         join pg_namespace pro_sch on pro_sch.oid = proc.pronamespace
         join media_types mtype on proc.prorettype = mtype.oid
@@ -1181,12 +1187,13 @@ mediaHandlers pgVer =
 
 decodeMediaHandlers :: HD.Result MediaHandlerMap
 decodeMediaHandlers =
-  HM.fromList . fmap (\(x, y, z) -> ((if isAnyElement y then RelAnyElement else RelId y, z), CustomFunc x) ) <$> HD.rowList caggRow
+  HM.fromList . fmap (\(x, y, z, w) -> ((if isAnyElement y then RelAnyElement else RelId y, z), (CustomFunc x, w)) ) <$> HD.rowList caggRow
   where
-    caggRow = (,,)
+    caggRow = (,,,)
               <$> (QualifiedIdentifier <$> column HD.text <*> column HD.text)
               <*> (QualifiedIdentifier <$> column HD.text <*> column HD.text)
               <*> (MediaType.decodeMediaType . encodeUtf8 <$> column HD.text)
+              <*> (MediaType.decodeMediaType . encodeUtf8 <$> column HD.text)
 
 timezones :: Bool -> SQL.Statement () TimezoneNames
 timezones = SQL.Statement sql HE.noParams decodeTimezones

src/PostgREST/SchemaCache/Routine.hs

@@ -16,6 +16,7 @@ module PostgREST.SchemaCache.Routine
   , funcReturnsCompositeAlias
   , funcReturnsSingle
   , MediaHandlerMap
+  , ResolvedHandler
   , MediaHandler(..)
   ) where
 
@@ -145,4 +146,6 @@ funcTableName proc = case pdReturnType proc of
   Single (Composite qi _) -> Just $ qiName qi
   _                       -> Nothing
 
-type MediaHandlerMap = HM.HashMap (RelIdentifier, MediaType.MediaType) MediaHandler
+-- the resolved handler also carries the media type because MTAny (*/*) is resolved to a different media type
+type ResolvedHandler = (MediaHandler, MediaType.MediaType)
+type MediaHandlerMap = HM.HashMap (RelIdentifier, MediaType.MediaType) ResolvedHandler

test/spec/Feature/Query/CustomMediaSpec.hs

@@ -225,31 +225,30 @@ spec = describe "custom media types" $ do
 
   context "any media type" $ do
     context "on functions" $ do
-      -- TODO not correct, it should return the generic "application/octet-stream"
       it "returns application/json for */* if not explicitly set" $ do
         request methodGet "/rpc/ret_any_mt" (acceptHdrs "*/*") ""
           `shouldRespondWith` "any"
           { matchStatus  = 200
-          , matchHeaders = [matchContentTypeJson]
+          , matchHeaders = ["Content-Type" <:> "application/octet-stream"]
           }
 
-      it "accepts any media type and sets it as a header" $ do
+      it "accepts any media type and sets the generic octet-stream as content type" $ do
         request methodGet "/rpc/ret_any_mt" (acceptHdrs "app/bingo") ""
           `shouldRespondWith` "any"
           { matchStatus  = 200
-          , matchHeaders = ["Content-Type" <:> "app/bingo"]
+          , matchHeaders = ["Content-Type" <:> "application/octet-stream"]
           }
 
         request methodGet "/rpc/ret_any_mt" (acceptHdrs "text/bango") ""
           `shouldRespondWith` "any"
           { matchStatus  = 200
-          , matchHeaders = ["Content-Type" <:> "text/bango"]
+          , matchHeaders = ["Content-Type" <:> "application/octet-stream"]
           }
 
         request methodGet "/rpc/ret_any_mt" (acceptHdrs "image/boingo") ""
           `shouldRespondWith` "any"
           { matchStatus  = 200
-          , matchHeaders = ["Content-Type" <:> "image/boingo"]
+          , matchHeaders = ["Content-Type" <:> "application/octet-stream"]
           }
 
       it "returns custom media type for */* if explicitly set" $ do
@@ -276,12 +275,11 @@ spec = describe "custom media types" $ do
           `shouldRespondWith` 415
 
     context "on tables" $ do
-      -- TODO not correct, it should return the generic "application/octet-stream"
       it "returns application/json for */* if not explicitly set" $ do
         request methodGet "/some_numbers?val=eq.1" (acceptHdrs "*/*") ""
           `shouldRespondWith` "anything\n1"
           { matchStatus  = 200
-          , matchHeaders = [matchContentTypeJson]
+          , matchHeaders = ["Content-Type" <:> "application/octet-stream"]
           }
 
       it "accepts any media type and sets it as a header" $ do
@@ -298,5 +296,5 @@ spec = describe "custom media types" $ do
         request methodGet "/some_numbers?val=eq.4" (acceptHdrs "unknown/unknown") ""
           `shouldRespondWith` "anything\n4"
           { matchStatus  = 200
-          , matchHeaders = ["Content-Type" <:> "unknown/unknown"]
+          , matchHeaders = ["Content-Type" <:> "application/octet-stream"]
           }

test/spec/fixtures/schema.sql

@@ -3663,10 +3663,14 @@ declare
   resp bytea;
 begin
   case req_accept
-    when 'app/chico'   then resp := 'chico';
-    when 'app/harpo'   then resp := 'harpo';
+    when 'app/chico'   then
+      perform set_config('response.headers', json_build_array(json_build_object('Content-Type', req_accept))::text, true);
+      resp := 'chico';
+    when 'app/harpo'   then
+      perform set_config('response.headers', json_build_array(json_build_object('Content-Type', req_accept))::text, true);
+      resp := 'harpo';
     when '*/*'         then
-      perform set_config('response.headers', '[{"Content-Type": "app/groucho"}]', true);
+      perform set_config('response.headers', json_build_array(json_build_object('Content-Type', 'app/groucho'))::text, true);
       resp := 'groucho';
     else
       raise sqlstate 'PT415' using message = 'Unsupported Media Type';
@@ -3689,8 +3693,10 @@ declare
 begin
   case req_accept
     when 'magic/number' then
+      perform set_config('response.headers', json_build_array(json_build_object('Content-Type', req_accept))::text, true);
       prefix := 'magic';
     when 'crazy/bingo'  then
+      perform set_config('response.headers', json_build_array(json_build_object('Content-Type', req_accept))::text, true);
       prefix := 'crazy';
     else
       prefix := 'anything';