Function SetLocalAlias

clientapi/routing/directory.go:115–195

SetLocalAlias implements PUT /directory/room/{roomAlias}

(
	req *http.Request,
	device *userapi.Device,
	alias string,
	cfg *config.ClientAPI,
	rsAPI roomserverAPI.ClientRoomserverAPI,
)

// SetLocalAlias implements PUT /directory/room/{roomAlias}
func SetLocalAlias(
	req *http.Request,
	device *userapi.Device,
	alias string,
	cfg *config.ClientAPI,
	rsAPI roomserverAPI.ClientRoomserverAPI,
) util.JSONResponse {
	_, domain, err := gomatrixserverlib.SplitID('#', alias)
	if err != nil {
		return util.JSONResponse{
			Code: http.StatusBadRequest,
			JSON: jsonerror.BadJSON("Room alias must be in the form '#localpart:domain'"),
		}
	}

	if domain != cfg.Matrix.ServerName {
		return util.JSONResponse{
			Code: http.StatusForbidden,
			JSON: jsonerror.Forbidden("Alias must be on local homeserver"),
		}
	}

	// Check that the alias does not fall within an exclusive namespace of an
	// application service
	// TODO: This code should eventually be refactored with:
	// 1. The new method for checking for things matching an AS's namespace
	// 2. Using an overall Regex object for all AS's just like we did for usernames
	reqUserID, _, err := gomatrixserverlib.SplitID('@', device.UserID)
	if err != nil {
		return util.JSONResponse{
			Code: http.StatusBadRequest,
			JSON: jsonerror.BadJSON("User ID must be in the form '@localpart:domain'"),
		}
	}
	for _, appservice := range cfg.Derived.ApplicationServices {
		// Don't prevent AS from creating aliases in its own namespace
		// Note that Dendrite uses SenderLocalpart as UserID for AS users
		if reqUserID != appservice.SenderLocalpart {
			if aliasNamespaces, ok := appservice.NamespaceMap["aliases"]; ok {
				for _, namespace := range aliasNamespaces {
					if namespace.Exclusive && namespace.RegexpObject.MatchString(alias) {
						return util.JSONResponse{
							Code: http.StatusBadRequest,
							JSON: jsonerror.ASExclusive("Alias is reserved by an application service"),
						}
					}
				}
			}
		}
	}

	var r struct {
		RoomID string `json:"room_id"`
	}
	if resErr := httputil.UnmarshalJSONRequest(req, &r); resErr != nil {
		return *resErr
	}