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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 synctypes
import (
"fmt"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/gomatrixserverlib/spec"
)
type ClientEventFormat int
const (
// FormatAll will include all client event keys
FormatAll ClientEventFormat = iota
// FormatSync will include only the event keys required by the /sync API. Notably, this
// means the 'room_id' will be missing from the events.
FormatSync
)
// ClientEvent is an event which is fit for consumption by clients, in accordance with the specification.
type ClientEvent struct {
Content spec.RawJSON `json:"content"`
EventID string `json:"event_id,omitempty"` // EventID is omitted on receipt events
OriginServerTS spec.Timestamp `json:"origin_server_ts,omitempty"` // OriginServerTS is omitted on receipt events
RoomID string `json:"room_id,omitempty"` // RoomID is omitted on /sync responses
Sender string `json:"sender,omitempty"` // Sender is omitted on receipt events
SenderKey spec.SenderID `json:"sender_key,omitempty"` // The SenderKey for events in pseudo ID rooms
StateKey *string `json:"state_key,omitempty"`
Type string `json:"type"`
Unsigned spec.RawJSON `json:"unsigned,omitempty"`
Redacts string `json:"redacts,omitempty"`
}
// ToClientEvents converts server events to client events.
func ToClientEvents(serverEvs []gomatrixserverlib.PDU, format ClientEventFormat, userIDForSender spec.UserIDForSender) []ClientEvent {
evs := make([]ClientEvent, 0, len(serverEvs))
for _, se := range serverEvs {
if se == nil {
continue // TODO: shouldn't happen?
}
sender := spec.UserID{}
validRoomID, err := spec.NewRoomID(se.RoomID())
if err != nil {
continue
}
userID, err := userIDForSender(*validRoomID, se.SenderID())
if err == nil && userID != nil {
sender = *userID
}
sk := se.StateKey()
if sk != nil && *sk != "" {
skUserID, err := userIDForSender(*validRoomID, spec.SenderID(*sk))
if err == nil && skUserID != nil {
skString := skUserID.String()
sk = &skString
}
}
evs = append(evs, ToClientEvent(se, format, sender, sk))
}
return evs
}
// ToClientEvent converts a single server event to a client event.
func ToClientEvent(se gomatrixserverlib.PDU, format ClientEventFormat, sender spec.UserID, stateKey *string) ClientEvent {
ce := ClientEvent{
Content: spec.RawJSON(se.Content()),
Sender: sender.String(),
Type: se.Type(),
StateKey: stateKey,
Unsigned: spec.RawJSON(se.Unsigned()),
OriginServerTS: se.OriginServerTS(),
EventID: se.EventID(),
Redacts: se.Redacts(),
}
if format == FormatAll {
ce.RoomID = se.RoomID()
}
if se.Version() == gomatrixserverlib.RoomVersionPseudoIDs {
ce.SenderKey = se.SenderID()
}
return ce
}
// ToClientEvent converts a single server event to a client event.
// It provides default logic for event.SenderID & event.StateKey -> userID conversions.
func ToClientEventDefault(userIDQuery spec.UserIDForSender, event gomatrixserverlib.PDU) ClientEvent {
sender := spec.UserID{}
validRoomID, err := spec.NewRoomID(event.RoomID())
if err != nil {
return ClientEvent{}
}
userID, err := userIDQuery(*validRoomID, event.SenderID())
if err == nil && userID != nil {
sender = *userID
}
sk := event.StateKey()
if sk != nil && *sk != "" {
skUserID, err := userIDQuery(*validRoomID, spec.SenderID(*event.StateKey()))
if err == nil && skUserID != nil {
skString := skUserID.String()
sk = &skString
}
}
return ToClientEvent(event, FormatAll, sender, sk)
}
// If provided state key is a user ID (state keys beginning with @ are reserved for this purpose)
// fetch it's associated sender ID and use that instead. Otherwise returns the same state key back.
//
// # This function either returns the state key that should be used, or an error
//
// TODO: handle failure cases better (e.g. no sender ID)
func FromClientStateKey(roomID spec.RoomID, stateKey string, senderIDQuery spec.SenderIDForUser) (*string, error) {
if len(stateKey) >= 1 && stateKey[0] == '@' {
parsedStateKey, err := spec.NewUserID(stateKey, true)
if err != nil {
// If invalid user ID, then there is no associated state event.
return nil, fmt.Errorf("Provided state key begins with @ but is not a valid user ID: %s", err.Error())
}
senderID, err := senderIDQuery(roomID, *parsedStateKey)
if err != nil {
return nil, fmt.Errorf("Failed to query sender ID: %s", err.Error())
}
if senderID == nil {
// If no sender ID, then there is no associated state event.
return nil, fmt.Errorf("No associated sender ID found.")
}
newStateKey := string(*senderID)
return &newStateKey, nil
} else {
return &stateKey, nil
}
}
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