dendrite/roomserver/internal/alias.go

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// Copyright 2017 Vector Creations Ltd
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package internal
import (
"context"
"fmt"
"github.com/matrix-org/dendrite/roomserver/api"
"github.com/matrix-org/gomatrixserverlib"
asAPI "github.com/matrix-org/dendrite/appservice/api"
)
// RoomserverInternalAPIDatabase has the storage APIs needed to implement the alias API.
type RoomserverInternalAPIDatabase 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(ctx context.Context, alias string, roomID string, creatorUserID string) error
// Look up the room ID a given alias refers to.
// Returns an error if there was a problem talking to the database.
GetRoomIDForAlias(ctx context.Context, alias string) (string, error)
// Look up all aliases referring to a given room ID.
// Returns an error if there was a problem talking to the database.
GetAliasesForRoomID(ctx context.Context, roomID string) ([]string, error)
// Get the user ID of the creator of an alias.
// Returns an error if there was a problem talking to the database.
GetCreatorIDForAlias(ctx context.Context, alias string) (string, error)
// Remove a given room alias.
// Returns an error if there was a problem talking to the database.
RemoveRoomAlias(ctx context.Context, alias string) error
// Look up the room version for a given room.
GetRoomVersionForRoom(
ctx context.Context, roomID string,
) (gomatrixserverlib.RoomVersion, error)
}
// SetRoomAlias implements alias.RoomserverInternalAPI
func (r *RoomserverInternalAPI) SetRoomAlias(
ctx context.Context,
request *api.SetRoomAliasRequest,
response *api.SetRoomAliasResponse,
) error {
// Check if the alias isn't already referring to a room
roomID, err := r.DB.GetRoomIDForAlias(ctx, request.Alias)
if err != nil {
return err
}
if len(roomID) > 0 {
// If the alias already exists, stop the process
response.AliasExists = true
return nil
}
response.AliasExists = false
// Save the new alias
if err := r.DB.SetRoomAlias(ctx, request.Alias, request.RoomID, request.UserID); err != nil {
return err
}
return nil
}
// GetRoomIDForAlias implements alias.RoomserverInternalAPI
func (r *RoomserverInternalAPI) GetRoomIDForAlias(
ctx context.Context,
request *api.GetRoomIDForAliasRequest,
response *api.GetRoomIDForAliasResponse,
) error {
// Look up the room ID in the database
roomID, err := r.DB.GetRoomIDForAlias(ctx, request.Alias)
if err == nil && roomID != "" {
response.RoomID = roomID
return nil
}
// Check appservice on err, but only if the appservice API is
// wired in and no room ID was found.
if r.asAPI != nil && request.IncludeAppservices && roomID == "" {
// No room found locally, try our application services by making a call to
// the appservice component
aliasReq := &asAPI.RoomAliasExistsRequest{
Alias: request.Alias,
}
aliasRes := &asAPI.RoomAliasExistsResponse{}
if err = r.asAPI.RoomAliasExists(ctx, aliasReq, aliasRes); err != nil {
return err
}
if aliasRes.AliasExists {
roomID, err = r.DB.GetRoomIDForAlias(ctx, request.Alias)
if err != nil {
return err
}
response.RoomID = roomID
return nil
}
}
return err
}
// GetAliasesForRoomID implements alias.RoomserverInternalAPI
func (r *RoomserverInternalAPI) GetAliasesForRoomID(
ctx context.Context,
request *api.GetAliasesForRoomIDRequest,
response *api.GetAliasesForRoomIDResponse,
) error {
// Look up the aliases in the database for the given RoomID
aliases, err := r.DB.GetAliasesForRoomID(ctx, request.RoomID)
if err != nil {
return err
}
response.Aliases = aliases
return nil
}
// GetCreatorIDForAlias implements alias.RoomserverInternalAPI
func (r *RoomserverInternalAPI) GetCreatorIDForAlias(
ctx context.Context,
request *api.GetCreatorIDForAliasRequest,
response *api.GetCreatorIDForAliasResponse,
) error {
// Look up the aliases in the database for the given RoomID
creatorID, err := r.DB.GetCreatorIDForAlias(ctx, request.Alias)
if err != nil {
return err
}
response.UserID = creatorID
return nil
}
// RemoveRoomAlias implements alias.RoomserverInternalAPI
func (r *RoomserverInternalAPI) RemoveRoomAlias(
ctx context.Context,
request *api.RemoveRoomAliasRequest,
response *api.RemoveRoomAliasResponse,
) error {
roomID, err := r.DB.GetRoomIDForAlias(ctx, request.Alias)
if err != nil {
return fmt.Errorf("r.DB.GetRoomIDForAlias: %w", err)
}
if roomID == "" {
response.Found = false
response.Removed = false
return nil
}
response.Found = true
creatorID, err := r.DB.GetCreatorIDForAlias(ctx, request.Alias)
if err != nil {
return fmt.Errorf("r.DB.GetCreatorIDForAlias: %w", err)
}
if creatorID != request.UserID {
plEvent, err := r.DB.GetStateEvent(ctx, roomID, gomatrixserverlib.MRoomPowerLevels, "")
if err != nil {
return fmt.Errorf("r.DB.GetStateEvent: %w", err)
}
pls, err := plEvent.PowerLevels()
if err != nil {
return fmt.Errorf("plEvent.PowerLevels: %w", err)
}
if pls.UserLevel(request.UserID) < pls.EventLevel(gomatrixserverlib.MRoomCanonicalAlias, true) {
response.Removed = false
return nil
}
}
// Remove the alias from the database
if err := r.DB.RemoveRoomAlias(ctx, request.Alias); err != nil {
return err
}
response.Removed = true
return nil
}