249 lines
7.3 KiB
Go
249 lines
7.3 KiB
Go
// Copyright 2017 Vector Creations Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package internal
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import (
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"context"
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"database/sql"
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"errors"
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"fmt"
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"time"
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asAPI "github.com/matrix-org/dendrite/appservice/api"
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"github.com/matrix-org/dendrite/internal/eventutil"
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"github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/dendrite/roomserver/internal/helpers"
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"github.com/matrix-org/gomatrixserverlib"
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"github.com/tidwall/gjson"
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"github.com/tidwall/sjson"
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)
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// RoomserverInternalAPIDatabase has the storage APIs needed to implement the alias API.
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type RoomserverInternalAPIDatabase interface {
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// Save a given room alias with the room ID it refers to.
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// Returns an error if there was a problem talking to the database.
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SetRoomAlias(ctx context.Context, alias string, roomID string, creatorUserID string) error
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// Look up the room ID a given alias refers to.
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// Returns an error if there was a problem talking to the database.
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GetRoomIDForAlias(ctx context.Context, alias string) (string, error)
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// Look up all aliases referring to a given room ID.
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// Returns an error if there was a problem talking to the database.
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GetAliasesForRoomID(ctx context.Context, roomID string) ([]string, error)
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// Remove a given room alias.
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// Returns an error if there was a problem talking to the database.
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RemoveRoomAlias(ctx context.Context, alias string) error
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// Look up the room version for a given room.
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GetRoomVersionForRoom(
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ctx context.Context, roomID string,
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) (gomatrixserverlib.RoomVersion, error)
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}
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// SetRoomAlias implements alias.RoomserverInternalAPI
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func (r *RoomserverInternalAPI) SetRoomAlias(
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ctx context.Context,
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request *api.SetRoomAliasRequest,
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response *api.SetRoomAliasResponse,
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) error {
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// Check if the alias isn't already referring to a room
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roomID, err := r.DB.GetRoomIDForAlias(ctx, request.Alias)
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if err != nil {
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return err
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}
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if len(roomID) > 0 {
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// If the alias already exists, stop the process
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response.AliasExists = true
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return nil
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}
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response.AliasExists = false
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// Save the new alias
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if err := r.DB.SetRoomAlias(ctx, request.Alias, request.RoomID, request.UserID); err != nil {
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return err
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}
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return nil
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}
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// GetRoomIDForAlias implements alias.RoomserverInternalAPI
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func (r *RoomserverInternalAPI) GetRoomIDForAlias(
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ctx context.Context,
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request *api.GetRoomIDForAliasRequest,
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response *api.GetRoomIDForAliasResponse,
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) error {
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// Look up the room ID in the database
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roomID, err := r.DB.GetRoomIDForAlias(ctx, request.Alias)
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if err == nil && roomID != "" {
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response.RoomID = roomID
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return nil
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}
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// Check appservice on err, but only if the appservice API is
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// wired in and no room ID was found.
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if r.asAPI != nil && request.IncludeAppservices && roomID == "" {
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// No room found locally, try our application services by making a call to
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// the appservice component
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aliasReq := &asAPI.RoomAliasExistsRequest{
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Alias: request.Alias,
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}
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aliasRes := &asAPI.RoomAliasExistsResponse{}
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if err = r.asAPI.RoomAliasExists(ctx, aliasReq, aliasRes); err != nil {
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return err
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}
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if aliasRes.AliasExists {
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roomID, err = r.DB.GetRoomIDForAlias(ctx, request.Alias)
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if err != nil {
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return err
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}
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response.RoomID = roomID
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return nil
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}
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}
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return err
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}
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// GetAliasesForRoomID implements alias.RoomserverInternalAPI
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func (r *RoomserverInternalAPI) GetAliasesForRoomID(
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ctx context.Context,
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request *api.GetAliasesForRoomIDRequest,
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response *api.GetAliasesForRoomIDResponse,
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) error {
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// Look up the aliases in the database for the given RoomID
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aliases, err := r.DB.GetAliasesForRoomID(ctx, request.RoomID)
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if err != nil {
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return err
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}
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response.Aliases = aliases
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return nil
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}
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// RemoveRoomAlias implements alias.RoomserverInternalAPI
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func (r *RoomserverInternalAPI) RemoveRoomAlias(
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ctx context.Context,
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request *api.RemoveRoomAliasRequest,
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response *api.RemoveRoomAliasResponse,
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) error {
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_, virtualHost, err := r.Cfg.Matrix.SplitLocalID('@', request.UserID)
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if err != nil {
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return err
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}
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roomID, err := r.DB.GetRoomIDForAlias(ctx, request.Alias)
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if err != nil {
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return fmt.Errorf("r.DB.GetRoomIDForAlias: %w", err)
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}
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if roomID == "" {
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response.Found = false
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response.Removed = false
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return nil
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}
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response.Found = true
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creatorID, err := r.DB.GetCreatorIDForAlias(ctx, request.Alias)
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if err != nil {
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return fmt.Errorf("r.DB.GetCreatorIDForAlias: %w", err)
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}
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if creatorID != request.UserID {
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var plEvent *gomatrixserverlib.HeaderedEvent
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var pls *gomatrixserverlib.PowerLevelContent
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plEvent, err = r.DB.GetStateEvent(ctx, roomID, gomatrixserverlib.MRoomPowerLevels, "")
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if err != nil {
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return fmt.Errorf("r.DB.GetStateEvent: %w", err)
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}
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pls, err = plEvent.PowerLevels()
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if err != nil {
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return fmt.Errorf("plEvent.PowerLevels: %w", err)
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}
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if pls.UserLevel(request.UserID) < pls.EventLevel(gomatrixserverlib.MRoomCanonicalAlias, true) {
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response.Removed = false
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return nil
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}
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}
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ev, err := r.DB.GetStateEvent(ctx, roomID, gomatrixserverlib.MRoomCanonicalAlias, "")
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if err != nil && err != sql.ErrNoRows {
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return err
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} else if ev != nil {
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stateAlias := gjson.GetBytes(ev.Content(), "alias").Str
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// the alias to remove is currently set as the canonical alias, remove it
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if stateAlias == request.Alias {
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res, err := sjson.DeleteBytes(ev.Content(), "alias")
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if err != nil {
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return err
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}
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sender := request.UserID
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if request.UserID != ev.Sender() {
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sender = ev.Sender()
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}
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_, senderDomain, err := r.Cfg.Matrix.SplitLocalID('@', sender)
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if err != nil {
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return err
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}
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identity, err := r.Cfg.Matrix.SigningIdentityFor(senderDomain)
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if err != nil {
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return err
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}
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builder := &gomatrixserverlib.EventBuilder{
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Sender: sender,
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RoomID: ev.RoomID(),
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Type: ev.Type(),
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StateKey: ev.StateKey(),
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Content: res,
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}
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eventsNeeded, err := gomatrixserverlib.StateNeededForEventBuilder(builder)
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if err != nil {
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return fmt.Errorf("gomatrixserverlib.StateNeededForEventBuilder: %w", err)
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}
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if len(eventsNeeded.Tuples()) == 0 {
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return errors.New("expecting state tuples for event builder, got none")
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}
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stateRes := &api.QueryLatestEventsAndStateResponse{}
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if err = helpers.QueryLatestEventsAndState(ctx, r.DB, &api.QueryLatestEventsAndStateRequest{RoomID: roomID, StateToFetch: eventsNeeded.Tuples()}, stateRes); err != nil {
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return err
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}
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newEvent, err := eventutil.BuildEvent(ctx, builder, r.Cfg.Matrix, identity, time.Now(), &eventsNeeded, stateRes)
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if err != nil {
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return err
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}
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err = api.SendEvents(ctx, r, api.KindNew, []*gomatrixserverlib.HeaderedEvent{newEvent}, virtualHost, r.ServerName, r.ServerName, nil, false)
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if err != nil {
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return err
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}
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}
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}
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// Remove the alias from the database
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if err := r.DB.RemoveRoomAlias(ctx, request.Alias); err != nil {
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return err
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}
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response.Removed = true
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return nil
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}
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