Add query API for listing active invites (#196)

* Add query API for listing active invites

This lists the invites for a user in a room that could be used to
join the room over federation.

* s/Lookup/Look up/

* Fix implements comments

src/github.com/matrix-org/dendrite/clientapi/auth/auth.go

@@ -41,7 +41,7 @@ var tokenByteLength = 32
 
 // DeviceDatabase represents a device database.
 type DeviceDatabase interface {
-	// Lookup the device matching the given access token.
+	// Look up the device matching the given access token.
 	GetDeviceByAccessToken(token string) (*authtypes.Device, error)
 }
 

src/github.com/matrix-org/dendrite/roomserver/alias/alias.go

@@ -32,10 +32,10 @@ type RoomserverAliasAPIDatabase interface {
 	// Save a given room alias with the room ID it refers to.
 	// Returns an error if there was a problem talking to the database.
 	SetRoomAlias(alias string, roomID string) error
-	// Lookup the room ID a given alias refers to.
+	// Look up the room ID a given alias refers to.
 	// Returns an error if there was a problem talking to the database.
 	GetRoomIDFromAlias(alias string) (string, error)
-	// Lookup all aliases referring to a given room ID.
+	// Look up all aliases referring to a given room ID.
 	// Returns an error if there was a problem talking to the database.
 	GetAliasesFromRoomID(roomID string) ([]string, error)
 	// Remove a given room alias.
@@ -86,7 +86,7 @@ func (r *RoomserverAliasAPI) GetAliasRoomID(
 	request *api.GetAliasRoomIDRequest,
 	response *api.GetAliasRoomIDResponse,
 ) error {
-	// Lookup the room ID in the database
+	// Look up the room ID in the database
 	roomID, err := r.DB.GetRoomIDFromAlias(request.Alias)
 	if err != nil {
 		return err
@@ -101,7 +101,7 @@ func (r *RoomserverAliasAPI) RemoveRoomAlias(
 	request *api.RemoveRoomAliasRequest,
 	response *api.RemoveRoomAliasResponse,
 ) error {
-	// Lookup the room ID in the database
+	// Look up the room ID in the database
 	roomID, err := r.DB.GetRoomIDFromAlias(request.Alias)
 	if err != nil {
 		return err

src/github.com/matrix-org/dendrite/roomserver/api/query.go

@@ -117,6 +117,23 @@ type QueryMembershipsForRoomResponse struct {
 	HasBeenInRoom bool `json:"has_been_in_room"`
 }
 
+// QueryInvitesForUserRequest is a request to QueryInvitesForUser
+type QueryInvitesForUserRequest struct {
+	// The room ID to look up invites in.
+	RoomID string `json:"room_id"`
+	// The User ID to look up invites for.
+	TargetUserID string `json:"target_user_id"`
+}
+
+// QueryInvitesForUserResponse is a response to QueryInvitesForUser
+// This is used when accepting an invite or rejecting a invite to tell which
+// remote matrix servers to contact.
+type QueryInvitesForUserResponse struct {
+	// A list of matrix user IDs for each sender of an active invite targeting
+	// the requested user ID.
+	InviteSenderUserIDs []string `json:"invite_sender_user_ids"`
+}
+
 // 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.
@@ -142,6 +159,12 @@ type RoomserverQueryAPI interface {
 		request *QueryMembershipsForRoomRequest,
 		response *QueryMembershipsForRoomResponse,
 	) error
+
+	// Query a list of invite event senders for a user in a room.
+	QueryInvitesForUser(
+		request *QueryInvitesForUserRequest,
+		response *QueryInvitesForUserResponse,
+	) error
 }
 
 // RoomserverQueryLatestEventsAndStatePath is the HTTP path for the QueryLatestEventsAndState API.
@@ -156,6 +179,9 @@ const RoomserverQueryEventsByIDPath = "/api/roomserver/queryEventsByID"
 // RoomserverQueryMembershipsForRoomPath is the HTTP path for the QueryMembershipsForRoom API
 const RoomserverQueryMembershipsForRoomPath = "/api/roomserver/queryMembershipsForRoom"
 
+// RoomserverQueryInvitesForUserPath is the HTTP path for the QueryInvitesForUser API
+const RoomserverQueryInvitesForUserPath = "/api/roomserver/queryInvitesForUser"
+
 // 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 {
@@ -206,6 +232,15 @@ func (h *httpRoomserverQueryAPI) QueryMembershipsForRoom(
 	return postJSON(h.httpClient, apiURL, request, response)
 }
 
+// QueryInvitesForUser implements RoomserverQueryAPI
+func (h *httpRoomserverQueryAPI) QueryInvitesForUser(
+	request *QueryInvitesForUserRequest,
+	response *QueryInvitesForUserResponse,
+) error {
+	apiURL := h.roomserverURL + RoomserverQueryInvitesForUserPath
+	return postJSON(h.httpClient, apiURL, request, response)
+}
+
 func postJSON(httpClient *http.Client, apiURL string, request, response interface{}) error {
 	jsonBytes, err := json.Marshal(request)
 	if err != nil {

src/github.com/matrix-org/dendrite/roomserver/input/authevents.go

@@ -117,7 +117,7 @@ func loadAuthEvents(
 	needed gomatrixserverlib.StateNeeded,
 	state []types.StateEntry,
 ) (result authEvents, err error) {
-	// Lookup the numeric IDs for the state keys needed for auth.
+	// Look up the numeric IDs for the state keys needed for auth.
 	var neededStateKeys []string
 	neededStateKeys = append(neededStateKeys, needed.Member...)
 	neededStateKeys = append(neededStateKeys, needed.ThirdPartyInvite...)

src/github.com/matrix-org/dendrite/roomserver/input/events.go

@@ -29,18 +29,18 @@ type RoomEventDatabase interface {
 	state.RoomStateDatabase
 	// Stores a matrix room event in the database
 	StoreEvent(event gomatrixserverlib.Event, authEventNIDs []types.EventNID) (types.RoomNID, types.StateAtEvent, error)
-	// Lookup the state entries for a list of string event IDs
+	// Look up the state entries for a list of string event IDs
 	// Returns an error if the there is an error talking to the database
 	// Returns a types.MissingEventError if the event IDs aren't in the database.
 	StateEntriesForEventIDs(eventIDs []string) ([]types.StateEntry, error)
 	// Set the state at an event.
 	SetState(eventNID types.EventNID, stateNID types.StateSnapshotNID) error
-	// Lookup the latest events in a room in preparation for an update.
+	// Look up the latest events in a room in preparation for an update.
 	// The RoomRecentEventsUpdater must have Commit or Rollback called on it if this doesn't return an error.
 	// Returns the latest events in the room and the last eventID sent to the log along with an updater.
 	// If this returns an error then no further action is required.
 	GetLatestEventsForUpdate(roomNID types.RoomNID) (updater types.RoomRecentEventsUpdater, err error)
-	// Lookup the string event IDs for a list of numeric event IDs
+	// Look up the string event IDs for a list of numeric event IDs
 	EventIDs(eventNIDs []types.EventNID) (map[types.EventNID]string, error)
 	// Build a membership updater for the target user in a room.
 	MembershipUpdater(roomID, targerUserID string) (types.MembershipUpdater, error)

src/github.com/matrix-org/dendrite/roomserver/query/query.go

@@ -29,36 +29,31 @@ import (
 // RoomserverQueryAPIDatabase has the storage APIs needed to implement the query API.
 type RoomserverQueryAPIDatabase interface {
 	state.RoomStateDatabase
-	// Lookup the numeric ID for the room.
+	// Look up the numeric ID for the room.
 	// Returns 0 if the room doesn't exists.
 	// Returns an error if there was a problem talking to the database.
 	RoomNID(roomID string) (types.RoomNID, error)
-	// Lookup event references for the latest events in the room and the current state snapshot.
+	// Look up event references for the latest events in the room and the current state snapshot.
 	// Returns the latest events, the current state and the maximum depth of the latest events plus 1.
 	// Returns an error if there was a problem talking to the database.
 	LatestEventIDs(roomNID types.RoomNID) ([]gomatrixserverlib.EventReference, types.StateSnapshotNID, int64, error)
-	// Lookup the numeric IDs for a list of events.
+	// Look up the numeric IDs for a list of events.
 	// Returns an error if there was a problem talking to the database.
 	EventNIDs(eventIDs []string) (map[string]types.EventNID, error)
-	// Save a given room alias with the room ID it refers to.
+	// Look up the join events for all members in a room as requested by a given
-	// Returns an error if there was a problem talking to the database.
-	SetRoomAlias(alias string, roomID string) error
-	// Lookup the room ID a given alias refers to.
-	// Returns an error if there was a problem talking to the database.
-	GetRoomIDFromAlias(alias string) (string, error)
-	// Lookup all aliases referring to a given room ID.
-	// Returns an error if there was a problem talking to the database.
-	GetAliasesFromRoomID(roomID string) ([]string, error)
-	// Remove a given room alias.
-	// Returns an error if there was a problem talking to the database.
-	RemoveRoomAlias(alias string) error
-	// Lookup the join events for all members in a room as requested by a given
 	// user. If the user is currently in the room, returns the room's current
 	// members, if not returns an empty array (TODO: Fix it)
 	// If the user requesting the list of members has never been in the room,
 	// returns nil.
 	// If there was an issue retrieving the events, returns an error.
 	GetMembershipEvents(roomNID types.RoomNID, requestSenderUserID string) (events []types.Event, err error)
+	// Look up the active invites targeting a user in a room and return the
+	// numeric state key IDs for the user IDs who sent them.
+	// Returns an error if there was a problem talking to the database.
+	GetInvitesForUser(roomNID types.RoomNID, targetUserNID types.EventStateKeyNID) (senderUserNIDs []types.EventStateKeyNID, err error)
+	// Look up the string event state keys for a list of numeric event state keys
+	// Returns an error if there was a problem talking to the database.
+	EventStateKeys([]types.EventStateKeyNID) (map[types.EventStateKeyNID]string, error)
 }
 
 // RoomserverQueryAPI is an implementation of api.RoomserverQueryAPI
@@ -86,7 +81,7 @@ func (r *RoomserverQueryAPI) QueryLatestEventsAndState(
 		return err
 	}
 
-	// Lookup the currrent state for the requested tuples.
+	// Look up the currrent state for the requested tuples.
 	stateEntries, err := state.LoadStateAtSnapshotForStringTuples(r.DB, currentStateSnapshotNID, request.StateToFetch)
 	if err != nil {
 		return err
@@ -127,7 +122,7 @@ func (r *RoomserverQueryAPI) QueryStateAfterEvents(
 	}
 	response.PrevEventsExist = true
 
-	// Lookup the currrent state for the requested tuples.
+	// Look up the currrent state for the requested tuples.
 	stateEntries, err := state.LoadStateAfterEventsForStringTuples(r.DB, prevStates, request.StateToFetch)
 	if err != nil {
 		return err
@@ -220,6 +215,39 @@ func (r *RoomserverQueryAPI) QueryMembershipsForRoom(
 	return nil
 }
 
+// QueryInvitesForUser implements api.RoomserverQueryAPI
+func (r *RoomserverQueryAPI) QueryInvitesForUser(
+	request *api.QueryInvitesForUserRequest,
+	response *api.QueryInvitesForUserResponse,
+) error {
+	roomNID, err := r.DB.RoomNID(request.RoomID)
+	if err != nil {
+		return err
+	}
+
+	targetUserNIDs, err := r.DB.EventStateKeyNIDs([]string{request.TargetUserID})
+	if err != nil {
+		return err
+	}
+	targetUserNID := targetUserNIDs[request.TargetUserID]
+
+	senderUserNIDs, err := r.DB.GetInvitesForUser(roomNID, targetUserNID)
+	if err != nil {
+		return err
+	}
+
+	senderUserIDs, err := r.DB.EventStateKeys(senderUserNIDs)
+	if err != nil {
+		return err
+	}
+
+	for _, senderUserID := range senderUserIDs {
+		response.InviteSenderUserIDs = append(response.InviteSenderUserIDs, senderUserID)
+	}
+
+	return nil
+}
+
 // SetupHTTP adds the RoomserverQueryAPI handlers to the http.ServeMux.
 func (r *RoomserverQueryAPI) SetupHTTP(servMux *http.ServeMux) {
 	servMux.Handle(
@@ -278,4 +306,18 @@ func (r *RoomserverQueryAPI) SetupHTTP(servMux *http.ServeMux) {
 			return util.JSONResponse{Code: 200, JSON: &response}
 		}),
 	)
+	servMux.Handle(
+		api.RoomserverQueryInvitesForUserPath,
+		common.MakeAPI("queryInvitesForUser", func(req *http.Request) util.JSONResponse {
+			var request api.QueryInvitesForUserRequest
+			var response api.QueryInvitesForUserResponse
+			if err := json.NewDecoder(req.Body).Decode(&request); err != nil {
+				return util.ErrorResponse(err)
+			}
+			if err := r.QueryInvitesForUser(&request, &response); err != nil {
+				return util.ErrorResponse(err)
+			}
+			return util.JSONResponse{Code: 200, JSON: &response}
+		}),
+	)
 }

src/github.com/matrix-org/dendrite/roomserver/state/state.go

@@ -30,30 +30,30 @@ import (
 type RoomStateDatabase interface {
 	// Store the room state at an event in the database
 	AddState(roomNID types.RoomNID, stateBlockNIDs []types.StateBlockNID, state []types.StateEntry) (types.StateSnapshotNID, error)
-	// Lookup the state of a room at each event for a list of string event IDs.
+	// Look up the state of a room at each event for a list of string event IDs.
 	// Returns an error if there is an error talking to the database
 	// Returns a types.MissingEventError if the room state for the event IDs aren't in the database
 	StateAtEventIDs(eventIDs []string) ([]types.StateAtEvent, error)
-	// Lookup the numeric IDs for a list of string event types.
+	// Look up the numeric IDs for a list of string event types.
 	// Returns a map from string event type to numeric ID for the event type.
 	EventTypeNIDs(eventTypes []string) (map[string]types.EventTypeNID, error)
-	// Lookup the numeric IDs for a list of string event state keys.
+	// Look up the numeric IDs for a list of string event state keys.
 	// Returns a map from string state key to numeric ID for the state key.
 	EventStateKeyNIDs(eventStateKeys []string) (map[string]types.EventStateKeyNID, error)
-	// Lookup the numeric state data IDs for each numeric state snapshot ID
+	// Look up the numeric state data IDs for each numeric state snapshot ID
 	// The returned slice is sorted by numeric state snapshot ID.
 	StateBlockNIDs(stateNIDs []types.StateSnapshotNID) ([]types.StateBlockNIDList, error)
-	// Lookup the state data for each numeric state data ID
+	// Look up the state data for each numeric state data ID
 	// The returned slice is sorted by numeric state data ID.
 	StateEntries(stateBlockNIDs []types.StateBlockNID) ([]types.StateEntryList, error)
-	// Lookup the state data for the state key tuples for each numeric state block ID
+	// Look up the state data for the state key tuples for each numeric state block ID
 	// This is used to fetch a subset of the room state at a snapshot.
 	// If a block doesn't contain any of the requested tuples then it can be discarded from the result.
 	// The returned slice is sorted by numeric state block ID.
 	StateEntriesForTuples(stateBlockNIDs []types.StateBlockNID, stateKeyTuples []types.StateKeyTuple) (
 		[]types.StateEntryList, error,
 	)
-	// Lookup the Events for a list of numeric event IDs.
+	// Look up the Events for a list of numeric event IDs.
 	// Returns a sorted list of events.
 	Events(eventNIDs []types.EventNID) ([]types.Event, error)
 }

src/github.com/matrix-org/dendrite/roomserver/storage/storage.go

@@ -161,7 +161,12 @@ func (d *Database) EventStateKeyNIDs(eventStateKeys []string) (map[string]types.
 	return d.statements.bulkSelectEventStateKeyNID(eventStateKeys)
 }
 
-// EventNIDs implements query.RoomQueryDatabase
+// EventStateKeys implements query.RoomserverQueryAPIDatabase
+func (d *Database) EventStateKeys(eventStateKeyNIDs []types.EventStateKeyNID) (map[types.EventStateKeyNID]string, error) {
+	return d.statements.bulkSelectEventStateKey(eventStateKeyNIDs)
+}
+
+// EventNIDs implements query.RoomserverQueryAPIDatabase
 func (d *Database) EventNIDs(eventIDs []string) (map[string]types.EventNID, error) {
 	return d.statements.bulkSelectEventNID(eventIDs)
 }
@@ -336,7 +341,7 @@ func (d *Database) RoomNID(roomID string) (types.RoomNID, error) {
 	return roomNID, err
 }
 
-// LatestEventIDs implements query.RoomserverQueryAPIDB
+// LatestEventIDs implements query.RoomserverQueryAPIDatabase
 func (d *Database) LatestEventIDs(roomNID types.RoomNID) ([]gomatrixserverlib.EventReference, types.StateSnapshotNID, int64, error) {
 	eventNIDs, currentStateSnapshotNID, err := d.statements.selectLatestEventNIDs(roomNID)
 	if err != nil {
@@ -353,6 +358,13 @@ func (d *Database) LatestEventIDs(roomNID types.RoomNID) ([]gomatrixserverlib.Ev
 	return references, currentStateSnapshotNID, depth, nil
 }
 
+// GetInvitesForUser implements query.RoomserverQueryAPIDatabase
+func (d *Database) GetInvitesForUser(
+	roomNID types.RoomNID, targetUserNID types.EventStateKeyNID,
+) (senderUserIDs []types.EventStateKeyNID, err error) {
+	return d.statements.selectInviteActiveForUserInRoom(targetUserNID, roomNID)
+}
+
 // SetRoomAlias implements alias.RoomserverAliasAPIDB
 func (d *Database) SetRoomAlias(alias string, roomID string) error {
 	return d.statements.insertRoomAlias(alias, roomID)
@@ -494,7 +506,7 @@ func (u *membershipUpdater) SetToJoin(senderUserID string, eventID string, isUpd
 		}
 	}
 
-	// Lookup the NID of the new join event
+	// Look up the NID of the new join event
 	nIDs, err := u.d.EventNIDs([]string{eventID})
 	if err != nil {
 		return nil, err
@@ -524,7 +536,7 @@ func (u *membershipUpdater) SetToLeave(senderUserID string, eventID string) ([]s
 		return nil, err
 	}
 
-	// Lookup the NID of the new leave event
+	// Look up the NID of the new leave event
 	nIDs, err := u.d.EventNIDs([]string{eventID})
 	if err != nil {
 		return nil, err