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// Copyright (c) 2020 Tulir Asokan
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package event
import (
"encoding/json"
"time"
"maunium.net/go/mautrix/id"
)
// Event represents a single Matrix event.
type Event struct {
StateKey *string `json:"state_key,omitempty"` // The state key for the event. Only present on State Events.
Sender id.UserID `json:"sender,omitempty"` // The user ID of the sender of the event
Type Type `json:"type"` // The event type
Timestamp int64 `json:"origin_server_ts,omitempty"` // The unix timestamp when this message was sent by the origin server
ID id.EventID `json:"event_id,omitempty"` // The unique ID of this event
RoomID id.RoomID `json:"room_id,omitempty"` // The room the event was sent to. May be nil (e.g. for presence)
Content Content `json:"content"` // The JSON content of the event.
Redacts id.EventID `json:"redacts,omitempty"` // The event ID that was redacted if a m.room.redaction event
Unsigned Unsigned `json:"unsigned,omitempty"` // Unsigned content set by own homeserver.
Mautrix MautrixInfo `json:"-"`
ToUserID id.UserID `json:"to_user_id,omitempty"` // The user ID that the to-device event was sent to. Only present in MSC2409 appservice transactions.
ToDeviceID id.DeviceID `json:"to_device_id,omitempty"` // The device ID that the to-device event was sent to. Only present in MSC2409 appservice transactions.
}
type eventForMarshaling struct {
StateKey *string `json:"state_key,omitempty"`
Sender id.UserID `json:"sender,omitempty"`
Type Type `json:"type"`
Timestamp int64 `json:"origin_server_ts,omitempty"`
ID id.EventID `json:"event_id,omitempty"`
RoomID id.RoomID `json:"room_id,omitempty"`
Content Content `json:"content"`
Redacts id.EventID `json:"redacts,omitempty"`
Unsigned *Unsigned `json:"unsigned,omitempty"`
PrevContent *Content `json:"prev_content,omitempty"`
ReplacesState *id.EventID `json:"replaces_state,omitempty"`
ToUserID id.UserID `json:"to_user_id,omitempty"`
ToDeviceID id.DeviceID `json:"to_device_id,omitempty"`
}
// UnmarshalJSON unmarshals the event, including moving prev_content from the top level to inside unsigned.
func (evt *Event) UnmarshalJSON(data []byte) error {
var efm eventForMarshaling
err := json.Unmarshal(data, &efm)
if err != nil {
return err
}
evt.StateKey = efm.StateKey
evt.Sender = efm.Sender
evt.Type = efm.Type
evt.Timestamp = efm.Timestamp
evt.ID = efm.ID
evt.RoomID = efm.RoomID
evt.Content = efm.Content
evt.Redacts = efm.Redacts
if efm.Unsigned != nil {
evt.Unsigned = *efm.Unsigned
}
if efm.PrevContent != nil && evt.Unsigned.PrevContent == nil {
evt.Unsigned.PrevContent = efm.PrevContent
}
if efm.ReplacesState != nil && *efm.ReplacesState != "" && evt.Unsigned.ReplacesState == "" {
evt.Unsigned.ReplacesState = *efm.ReplacesState
}
evt.ToUserID = efm.ToUserID
evt.ToDeviceID = efm.ToDeviceID
return nil
}
// MarshalJSON marshals the event, including omitting the unsigned field if it's empty.
//
// This is necessary because Unsigned is not a pointer (for convenience reasons),
// and encoding/json doesn't know how to check if a non-pointer struct is empty.
//
// TODO(tulir): maybe it makes more sense to make Unsigned a pointer and make an easy and safe way to access it?
func (evt *Event) MarshalJSON() ([]byte, error) {
unsigned := &evt.Unsigned
if unsigned.IsEmpty() {
unsigned = nil
}
return json.Marshal(&eventForMarshaling{
StateKey: evt.StateKey,
Sender: evt.Sender,
Type: evt.Type,
Timestamp: evt.Timestamp,
ID: evt.ID,
RoomID: evt.RoomID,
Content: evt.Content,
Redacts: evt.Redacts,
Unsigned: unsigned,
ToUserID: evt.ToUserID,
ToDeviceID: evt.ToDeviceID,
})
}
type MautrixInfo struct {
TrustState id.TrustState
ForwardedKeys bool
WasEncrypted bool
TrustSource *id.Device
ReceivedAt time.Time
DecryptionDuration time.Duration
CheckpointSent bool
}
func (evt *Event) GetStateKey() string {
if evt.StateKey != nil {
return *evt.StateKey
}
return ""
}
type StrippedState struct {
Content Content `json:"content"`
Type Type `json:"type"`
StateKey string `json:"state_key"`
Sender id.UserID `json:"sender"`
}
type Unsigned struct {
PrevContent *Content `json:"prev_content,omitempty"`
PrevSender id.UserID `json:"prev_sender,omitempty"`
ReplacesState id.EventID `json:"replaces_state,omitempty"`
Age int64 `json:"age,omitempty"`
TransactionID string `json:"transaction_id,omitempty"`
Relations *Relations `json:"m.relations,omitempty"`
RedactedBecause *Event `json:"redacted_because,omitempty"`
InviteRoomState []StrippedState `json:"invite_room_state,omitempty"`
BeeperHSOrder int64 `json:"com.beeper.hs.order,omitempty"`
}
func (us *Unsigned) IsEmpty() bool {
return us.PrevContent == nil && us.PrevSender == "" && us.ReplacesState == "" && us.Age == 0 &&
us.TransactionID == "" && us.RedactedBecause == nil && us.InviteRoomState == nil && us.Relations == nil
}
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