Handle the case of user leaving the room in rooms/{roomID}/state API

go.sum

@@ -4,7 +4,6 @@ github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03
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@@ -30,7 +29,6 @@ github.com/btcsuite/goleveldb v0.0.0-20160330041536-7834afc9e8cd/go.mod h1:F+uVa
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@@ -60,7 +58,6 @@ github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21 h1:YEetp8
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@@ -68,37 +65,27 @@ github.com/frankban/quicktest v1.7.2/go.mod h1:jaStnuzAqU1AJdCO0l53JDCJrVDKcS03D
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@@ -114,35 +101,20 @@ github.com/golang/protobuf v1.3.2 h1:6nsPYzhq5kReh6QImI3k5qWzO4PEbvbIW2cwSfR/6xs
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@@ -156,7 +128,6 @@ github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm4
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-github.com/spf13/cast v1.3.0 h1:oget//CVOEoFewqQxwr0Ej5yjygnqGkvggSE/gB35Q8=
 github.com/spf13/cast v1.3.0/go.mod h1:Qx5cxh0v+4UWYiBimWS+eyWzqEqokIECu5etghLkUJE=
-github.com/spf13/cobra v0.0.5 h1:f0B+LkLX6DtmRH1isoNA9VTtNUK9K8xYd28JNNfOv/s=
 github.com/spf13/cobra v0.0.5/go.mod h1:3K3wKZymM7VvHMDS9+Akkh4K60UwM26emMESw8tLCHU=
-github.com/spf13/jwalterweatherman v1.0.0 h1:XHEdyB+EcvlqZamSM4ZOMGlc93t6AcsBEu9Gc1vn7yk=
 github.com/spf13/jwalterweatherman v1.0.0/go.mod h1:cQK4TGJAtQXfYWX+Ddv3mKDzgVb68N+wFjFa4jdeBTo=
 github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
-github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/spf13/viper v1.3.2/go.mod h1:ZiWeW+zYFKm7srdB9IoDzzZXaJaI5eL9QjNiN/DMA2s=
-github.com/spf13/viper v1.4.0 h1:yXHLWeravcrgGyFSyCgdYpXQ9dR9c/WED3pg1RhxqEU=
 github.com/spf13/viper v1.4.0/go.mod h1:PTJ7Z/lr49W6bUbkmS1V3by4uWynFiR9p7+dSq/yZzE=
 github.com/src-d/envconfig v1.0.0/go.mod h1:Q9YQZ7BKITldTBnoxsE5gOeB5y66RyPXeue/R4aaNBc=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/objx v0.2.0 h1:Hbg2NidpLE8veEBkEZTL3CvlkUIVzuU9jDplZO54c48=
 github.com/stretchr/objx v0.2.0/go.mod h1:qt09Ya8vawLte6SNmTgCsAVtYtaKzEcn8ATUoHMkEqE=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
@@ -430,7 +350,6 @@ github.com/tidwall/pretty v1.0.1 h1:WE4RBSZ1x6McVVC8S/Md+Qse8YUv6HRObAx6ke00NY8=
 github.com/tidwall/pretty v1.0.1/go.mod h1:XNkn88O1ChpSDQmQeStsy+sBenx6DDtFZJxhVysOjyk=
 github.com/tidwall/sjson v1.0.3 h1:DeF+0LZqvIt4fKYw41aPB29ZGlvwVkHKktoXJ1YW9Y8=
 github.com/tidwall/sjson v1.0.3/go.mod h1:bURseu1nuBkFpIES5cz6zBtjmYeOQmEESshn7VpF15Y=
-github.com/timakin/bodyclose v0.0.0-20190721030226-87058b9bfcec h1:AmoEvWAO3nDx1MEcMzPh+GzOOIA5Znpv6++c7bePPY0=
 github.com/timakin/bodyclose v0.0.0-20190721030226-87058b9bfcec/go.mod h1:Qimiffbc6q9tBWlVV6x0P9sat/ao1xEkREYPPj9hphk=
 github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
 github.com/uber-go/atomic v1.3.0 h1:ylWoWcs+jXihgo3Us1Sdsatf2R6+OlBGm8fexR3oFG4=
@@ -445,9 +364,7 @@ github.com/uber/jaeger-lib v2.2.0+incompatible h1:MxZXOiR2JuoANZ3J6DE/U0kSFv/eJ/
 github.com/uber/jaeger-lib v2.2.0+incompatible/go.mod h1:ComeNDZlWwrWnDv8aPp0Ba6+uUTzImX/AauajbLI56U=
 github.com/ugorji/go v1.1.4/go.mod h1:uQMGLiO92mf5W77hV/PUCpI3pbzQx3CRekS0kk+RGrc=
 github.com/ugorji/go/codec v0.0.0-20181204163529-d75b2dcb6bc8/go.mod h1:VFNgLljTbGfSG7qAOspJ7OScBnGdDN/yBr0sguwnwf0=
-github.com/ultraware/funlen v0.0.2 h1:Av96YVBwwNSe4MLR7iI/BIa3VyI7/djnto/pK3Uxbdo=
 github.com/ultraware/funlen v0.0.2/go.mod h1:Dp4UiAus7Wdb9KUZsYWZEWiRzGuM2kXM1lPbfaF6xhA=
-github.com/ultraware/whitespace v0.0.3 h1:S5BCRRB5sttNy0bSOhbpw+0mb+cHiCmWfrvxpEzuUk0=
 github.com/ultraware/whitespace v0.0.3/go.mod h1:aVMh/gQve5Maj9hQ/hg+F75lr/X5A89uZnzAmWSineA=
 github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyCJ6HpOuEn7z0Csc=
 github.com/valyala/fasthttp v1.2.0/go.mod h1:4vX61m6KN+xDduDNwXrhIAVZaZaZiQ1luJk8LWSxF3s=
@@ -462,6 +379,7 @@ go.uber.org/atomic v1.3.0 h1:vs7fgriifsPbGdK3bNuMWapNn3qnZhCRXc19NRdq010=
 go.uber.org/atomic v1.3.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
 go.uber.org/atomic v1.4.0 h1:cxzIVoETapQEqDhQu3QfnvXAV4AlzcvUCxkVUFw3+EU=
 go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
+go.uber.org/atomic v1.6.0/go.mod h1:sABNBOSYdrvTF6hTgEIbc7YasKWGhgEQZyfxyTvoXHQ=
 go.uber.org/multierr v1.1.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/0=
 go.uber.org/zap v1.10.0/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q=
 golang.org/x/crypto v0.0.0-20170930174604-9419663f5a44/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
@@ -483,6 +401,7 @@ golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
 golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
 golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
+golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
 golang.org/x/mod v0.0.0-20190513183733-4bf6d317e70e/go.mod h1:mXi4GBBbnImb6dmsKGUJ2LatrhH/nqhxcFungHvyanc=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
@@ -549,8 +468,8 @@ golang.org/x/tools v0.0.0-20190621195816-6e04913cbbac/go.mod h1:/rFqwRUd4F7ZHNgw
 golang.org/x/tools v0.0.0-20190719005602-e377ae9d6386/go.mod h1:jcCCGcm9btYwXyDqrUWc6MKQKKGJCWEQ3AfLSRIbEuI=
 golang.org/x/tools v0.0.0-20190910044552-dd2b5c81c578/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20190911230505-6bfd74cf029c/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
-golang.org/x/tools v0.0.0-20190912215617-3720d1ec3678 h1:rM1Udd0CgtYI3KUIhu9ROz0QCqjW+n/ODp/hH7c60Xc=
 golang.org/x/tools v0.0.0-20190912215617-3720d1ec3678/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20191029041327-9cc4af7d6b2c/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
@@ -590,13 +509,8 @@ gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.5 h1:ymVxjfMaHvXD8RqPRmzHHsB3VvucivSkIAvJFDI5O3c=
 gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.1-2019.2.3 h1:3JgtbtFHMiCmsznwGVTUWbgGov+pVqnlf1dEJTNAXeM=
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
-mvdan.cc/interfacer v0.0.0-20180901003855-c20040233aed h1:WX1yoOaKQfddO/mLzdV4wptyWgoH/6hwLs7QHTixo0I=
 mvdan.cc/interfacer v0.0.0-20180901003855-c20040233aed/go.mod h1:Xkxe497xwlCKkIaQYRfC7CSLworTXY9RMqwhhCm+8Nc=
-mvdan.cc/lint v0.0.0-20170908181259-adc824a0674b h1:DxJ5nJdkhDlLok9K6qO+5290kphDJbHOQO1DFFFTeBo=
 mvdan.cc/lint v0.0.0-20170908181259-adc824a0674b/go.mod h1:2odslEg/xrtNQqCYg2/jCoyKnw3vv5biOc3JnIcYfL4=
-mvdan.cc/unparam v0.0.0-20190720180237-d51796306d8f h1:Cq7MalBHYACRd6EesksG1Q8EoIAKOsiZviGKbOLIej4=
 mvdan.cc/unparam v0.0.0-20190720180237-d51796306d8f/go.mod h1:4G1h5nDURzA3bwVMZIVpwbkw+04kSxk3rAtzlimaUJw=
-sourcegraph.com/sqs/pbtypes v0.0.0-20180604144634-d3ebe8f20ae4 h1:JPJh2pk3+X4lXAkZIk2RuE/7/FoK9maXw+TNPJhVS/c=
 sourcegraph.com/sqs/pbtypes v0.0.0-20180604144634-d3ebe8f20ae4/go.mod h1:ketZ/q3QxT9HOBeFhu6RdvsftgpsbFHBF5Cas6cDKZ0=

roomserver/api/query.go

@@ -255,6 +255,13 @@ type QueryRoomVersionCapabilitiesResponse struct {
 	AvailableRoomVersions map[string]string `json:"available"`
 }
 
+type QueryFullStateAtEventRequest struct {
+	EventID string `json:"event_id"`
+}
+type QueryFullStateAtEventResponse struct {
+	StateEvents []gomatrixserverlib.Event `json:"state_events"`
+}
+
 // RoomserverQueryAPI is used to query information from the room server.
 type RoomserverQueryAPI interface {
 	// Query the latest events and state for a room from the room server.
@@ -341,6 +348,12 @@ type RoomserverQueryAPI interface {
 		request *QueryRoomVersionCapabilitiesRequest,
 		response *QueryRoomVersionCapabilitiesResponse,
 	) error
+
+	QueryFullStateAtEvent(
+		ctx context.Context,
+		request *QueryFullStateAtEventRequest,
+		response *QueryFullStateAtEventResponse,
+	) error
 }
 
 // RoomserverQueryLatestEventsAndStatePath is the HTTP path for the QueryLatestEventsAndState API.
@@ -379,6 +392,9 @@ const RoomserverQueryServersInRoomAtEventPath = "/api/roomserver/queryServersInR
 // RoomserverQueryRoomVersionCapabilitiesPath is the HTTP path for the QueryRoomVersionCapabilities API
 const RoomserverQueryRoomVersionCapabilitiesPath = "/api/roomserver/queryRoomVersionCapabilities"
 
+// QueryFullStateAtEventPath is the HTTP path for the QueryFullStateAtEvent API
+const RoomserverQueryFullStateAtEventPath = "/api/roomserver/FullStateAtEvent"
+
 // NewRoomserverQueryAPIHTTP creates a RoomserverQueryAPI implemented by talking to a HTTP POST API.
 // If httpClient is nil then it uses the http.DefaultClient
 func NewRoomserverQueryAPIHTTP(roomserverURL string, httpClient *http.Client) RoomserverQueryAPI {
@@ -548,3 +564,16 @@ func (h *httpRoomserverQueryAPI) QueryRoomVersionCapabilities(
 	apiURL := h.roomserverURL + RoomserverQueryRoomVersionCapabilitiesPath
 	return commonHTTP.PostJSON(ctx, span, h.httpClient, apiURL, request, response)
 }
+
+// QueryServersInRoomAtEvent implements RoomServerQueryAPI
+func (h *httpRoomserverQueryAPI) QueryFullStateAtEvent(
+	ctx context.Context,
+	request *QueryFullStateAtEventRequest,
+	response *QueryFullStateAtEventResponse,
+) error {
+	span, ctx := opentracing.StartSpanFromContext(ctx, "QueryRoomVersionCapabilities")
+	defer span.Finish()
+
+	apiURL := h.roomserverURL + RoomserverQueryFullStateAtEventPath
+	return commonHTTP.PostJSON(ctx, span, h.httpClient, apiURL, request, response)
+}

roomserver/query/query.go

@@ -485,6 +485,27 @@ func (r *RoomserverQueryAPI) checkServerAllowedToSeeEvent(
 	return auth.IsServerAllowed(serverName, stateAtEvent), nil
 }
 
+// QueryServerAllowedToSeeEvent implements api.RoomserverQueryAPI
+func (r *RoomserverQueryAPI) QueryFullStateAtEvent(
+	ctx context.Context,
+	request *api.QueryFullStateAtEventRequest,
+	response *api.QueryFullStateAtEventResponse,
+) (err error) {
+	// TODO: get the correct room version
+	roomState, err := state.GetStateResolutionAlgorithm(state.StateResolutionAlgorithmV1, r.DB)
+	if err != nil {
+		return err
+	}
+
+	stateEntries, err := roomState.LoadStateAtEvent(ctx, request.EventID)
+	if err != nil {
+		return
+	}
+
+	response.StateEvents, err = r.loadStateEvents(ctx, stateEntries)
+	return
+}
+
 // QueryMissingEvents implements api.RoomserverQueryAPI
 func (r *RoomserverQueryAPI) QueryMissingEvents(
 	ctx context.Context,

roomserver/storage/postgres/state_snapshot_table.go

@@ -19,6 +19,7 @@ import (
 	"context"
 	"database/sql"
 	"fmt"
+	"github.com/matrix-org/dendrite/common"
 
 	"github.com/lib/pq"
 	"github.com/matrix-org/dendrite/roomserver/types"
@@ -98,7 +99,7 @@ func (s *stateSnapshotStatements) bulkSelectStateBlockNIDs(
 	if err != nil {
 		return nil, err
 	}
-	defer rows.Close() // nolint: errcheck
+	defer common.CloseAndLogIfError(ctx, rows, "bulkSelectStateBlockNIDs: rows.Close() failed")
 	results := make([]types.StateBlockNIDList, len(stateNIDs))
 	i := 0
 	for ; rows.Next(); i++ {

syncapi/routing/routing.go

@@ -61,7 +61,7 @@ func Setup(
 		if err != nil {
 			return util.ErrorResponse(err)
 		}
-		return OnIncomingStateRequest(req, syncDB, vars["roomID"])
+		return OnIncomingStateRequest(req, syncDB, vars["roomID"], queryAPI, device)
 	})).Methods(http.MethodGet, http.MethodOptions)
 
 	r0mux.Handle("/rooms/{roomID}/state/{type}", common.MakeAuthAPI("room_state", authData, func(req *http.Request, device *authtypes.Device) util.JSONResponse {
@@ -69,7 +69,7 @@ func Setup(
 		if err != nil {
 			return util.ErrorResponse(err)
 		}
-		return OnIncomingStateTypeRequest(req, syncDB, vars["roomID"], vars["type"], "")
+		return OnIncomingStateTypeRequest(req, syncDB, vars["roomID"], vars["type"], "", device, queryAPI)
 	})).Methods(http.MethodGet, http.MethodOptions)
 
 	r0mux.Handle("/rooms/{roomID}/state/{type}/{stateKey}", common.MakeAuthAPI("room_state", authData, func(req *http.Request, device *authtypes.Device) util.JSONResponse {
@@ -77,7 +77,7 @@ func Setup(
 		if err != nil {
 			return util.ErrorResponse(err)
 		}
-		return OnIncomingStateTypeRequest(req, syncDB, vars["roomID"], vars["type"], vars["stateKey"])
+		return OnIncomingStateTypeRequest(req, syncDB, vars["roomID"], vars["type"], vars["stateKey"], device, queryAPI)
 	})).Methods(http.MethodGet, http.MethodOptions)
 
 	r0mux.Handle("/rooms/{roomID}/messages", common.MakeAuthAPI("room_messages", authData, func(req *http.Request, device *authtypes.Device) util.JSONResponse {

syncapi/routing/state.go

@@ -16,6 +16,8 @@ package routing
 
 import (
 	"encoding/json"
+	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
+	"github.com/matrix-org/dendrite/roomserver/api"
 	"net/http"
 
 	"github.com/matrix-org/dendrite/clientapi/jsonerror"
@@ -39,17 +41,35 @@ type stateEventInStateResp struct {
 // TODO: Check if the user is in the room. If not, check if the room's history
 // is publicly visible. Current behaviour is returning an empty array if the
 // user cannot see the room's history.
-func OnIncomingStateRequest(req *http.Request, db storage.Database, roomID string) util.JSONResponse {
+func OnIncomingStateRequest(req *http.Request, db storage.Database, roomID string, queryAPI api.RoomserverQueryAPI, device *authtypes.Device) util.JSONResponse {
-	// TODO(#287): Auth request and handle the case where the user has left (where
-	// we should return the state at the poin they left)
-
 	stateFilter := gomatrixserverlib.DefaultStateFilter()
 	// TODO: stateFilter should not limit the number of state events (or only limits abusive number of events)
 
-	stateEvents, err := db.GetStateEventsForRoom(req.Context(), roomID, &stateFilter)
+	var stateEvents []gomatrixserverlib.Event
-	if err != nil {
+	//Get membership event for user
-		util.GetLogger(req.Context()).WithError(err).Error("db.GetStateEventsForRoom failed")
+	event, err := db.GetStateEvent(req.Context(), roomID, gomatrixserverlib.MRoomMember, device.UserID)
-		return jsonerror.InternalServerError()
+	if event == nil {
+		return util.JSONResponse{
+			Code: http.StatusForbidden,
+			JSON: jsonerror.Forbidden("user is neither a member nor previously been member of the user"),
+		}
+	}
+	membership, _ := event.Membership()
+	if membership == gomatrixserverlib.Ban || membership == gomatrixserverlib.Leave {
+		queryReq := api.QueryFullStateAtEventRequest{EventID: event.EventID()}
+		var queryRes api.QueryFullStateAtEventResponse
+		err := queryAPI.QueryFullStateAtEvent(req.Context(), &queryReq, &queryRes)
+		if err != nil {
+			util.GetLogger(req.Context()).WithError(err).Error("queryAPI.QueryFullStateAtEvent failed")
+			return jsonerror.InternalServerError()
+		}
+		stateEvents = queryRes.StateEvents
+	} else {
+		stateEvents, err = db.GetStateEventsForRoom(req.Context(), roomID, &stateFilter)
+		if err != nil {
+			util.GetLogger(req.Context()).WithError(err).Error("db.GetStateEventsForRoom failed")
+			return jsonerror.InternalServerError()
+		}
 	}
 
 	resp := []stateEventInStateResp{}
@@ -88,9 +108,7 @@ func OnIncomingStateRequest(req *http.Request, db storage.Database, roomID strin
 // /rooms/{roomID}/state/{type}/{statekey} request. It will look in current
 // state to see if there is an event with that type and state key, if there
 // is then (by default) we return the content, otherwise a 404.
-func OnIncomingStateTypeRequest(req *http.Request, db storage.Database, roomID string, evType, stateKey string) util.JSONResponse {
+func OnIncomingStateTypeRequest(req *http.Request, db storage.Database, roomID string, evType, stateKey string, device *authtypes.Device, queryAPI api.RoomserverQueryAPI) util.JSONResponse {
-	// TODO(#287): Auth request and handle the case where the user has left (where
-	// we should return the state at the poin they left)
 
 	logger := util.GetLogger(req.Context())
 	logger.WithFields(log.Fields{
@@ -99,10 +117,55 @@ func OnIncomingStateTypeRequest(req *http.Request, db storage.Database, roomID s
 		"stateKey": stateKey,
 	}).Info("Fetching state")
 
-	event, err := db.GetStateEvent(req.Context(), roomID, evType, stateKey)
+	//Get membership event for user
-	if err != nil {
+	event, err := db.GetStateEvent(req.Context(), roomID, gomatrixserverlib.MRoomMember, device.UserID)
-		util.GetLogger(req.Context()).WithError(err).Error("db.GetStateEvent failed")
+	if event == nil {
-		return jsonerror.InternalServerError()
+		return util.JSONResponse{
+			Code: http.StatusForbidden,
+			JSON: jsonerror.Forbidden("user is neither a member nor previously been member of the user"),
+		}
+	}
+	membership, _ := event.Membership()
+	//we return state at the time user leaves the room
+	if membership == gomatrixserverlib.Ban || membership == gomatrixserverlib.Leave {
+		queryReq := api.QueryStateAfterEventsRequest{
+			RoomID:       roomID,
+			PrevEventIDs: []string{event.EventID()},
+			StateToFetch: []gomatrixserverlib.StateKeyTuple{{
+				EventType: evType,
+				StateKey:  stateKey,
+			}},
+		}
+		var queryRes api.QueryStateAfterEventsResponse
+		err := queryAPI.QueryStateAfterEvents(req.Context(), &queryReq, &queryRes)
+		if err != nil {
+			util.GetLogger(req.Context()).WithError(err).Error("queryAPI.QueryFullStateAtEvent failed")
+			return jsonerror.InternalServerError()
+		}
+		if queryRes.StateEvents == nil {
+			return util.JSONResponse{
+				Code: http.StatusNotFound,
+				JSON: jsonerror.NotFound("cannot find state"),
+			}
+		}
+
+		stateEvent := stateEventInStateResp{
+			ClientEvent: gomatrixserverlib.ToClientEvent(queryRes.StateEvents[0].Event, gomatrixserverlib.FormatAll),
+		}
+		return util.JSONResponse{
+			Code: http.StatusOK,
+			JSON: stateEvent.Content,
+		}
+
+	}
+
+	//We don't need to query state again if event type is m.room.member and state key is same as user id of current user
+	if stateKey != device.UserID || evType != gomatrixserverlib.MRoomMember {
+		event, err = db.GetStateEvent(req.Context(), roomID, evType, stateKey)
+		if err != nil {
+			util.GetLogger(req.Context()).WithError(err).Error("db.GetStateEvent failed")
+			return jsonerror.InternalServerError()
+		}
 	}
 
 	if event == nil {