/
encryption.go
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/
encryption.go
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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"
"maunium.net/go/mautrix/id"
)
// EncryptionEventContent represents the content of a m.room.encryption state event.
// https://matrix.org/docs/spec/client_server/r0.6.0#m-room-encryption
type EncryptionEventContent struct {
// The encryption algorithm to be used to encrypt messages sent in this room. Must be 'm.megolm.v1.aes-sha2'.
Algorithm id.Algorithm `json:"algorithm"`
// How long the session should be used before changing it. 604800000 (a week) is the recommended default.
RotationPeriodMillis int64 `json:"rotation_period_ms,omitempty"`
// How many messages should be sent before changing the session. 100 is the recommended default.
RotationPeriodMessages int `json:"rotation_period_msgs,omitempty"`
}
// EncryptedEventContent represents the content of a m.room.encrypted message event.
// https://matrix.org/docs/spec/client_server/r0.6.0#m-room-encrypted
type EncryptedEventContent struct {
Algorithm id.Algorithm `json:"algorithm"`
SenderKey id.SenderKey `json:"sender_key"`
DeviceID id.DeviceID `json:"device_id,omitempty"` // Only present for Megolm events
SessionID id.SessionID `json:"session_id,omitempty"` // Only present for Megolm events
Ciphertext json.RawMessage `json:"ciphertext"`
MegolmCiphertext []byte `json:"-"`
OlmCiphertext OlmCiphertexts `json:"-"`
RelatesTo *RelatesTo `json:"m.relates_to,omitempty"`
}
type OlmCiphertexts map[id.Curve25519]struct {
Body string `json:"body"`
Type id.OlmMsgType `json:"type"`
}
type serializableEncryptedEventContent EncryptedEventContent
func (content *EncryptedEventContent) UnmarshalJSON(data []byte) error {
err := json.Unmarshal(data, (*serializableEncryptedEventContent)(content))
if err != nil {
return err
}
switch content.Algorithm {
case id.AlgorithmOlmV1:
content.OlmCiphertext = make(OlmCiphertexts)
return json.Unmarshal(content.Ciphertext, &content.OlmCiphertext)
case id.AlgorithmMegolmV1:
if len(content.Ciphertext) == 0 || content.Ciphertext[0] != '"' || content.Ciphertext[len(content.Ciphertext)-1] != '"' {
return id.InputNotJSONString
}
content.MegolmCiphertext = content.Ciphertext[1 : len(content.Ciphertext)-1]
}
return nil
}
func (content *EncryptedEventContent) MarshalJSON() ([]byte, error) {
var err error
switch content.Algorithm {
case id.AlgorithmOlmV1:
content.Ciphertext, err = json.Marshal(content.OlmCiphertext)
case id.AlgorithmMegolmV1:
content.Ciphertext = make([]byte, len(content.MegolmCiphertext)+2)
content.Ciphertext[0] = '"'
content.Ciphertext[len(content.Ciphertext)-1] = '"'
copy(content.Ciphertext[1:len(content.Ciphertext)-1], content.MegolmCiphertext)
}
if err != nil {
return nil, err
}
return json.Marshal((*serializableEncryptedEventContent)(content))
}
// RoomKeyEventContent represents the content of a m.room_key to_device event.
// https://matrix.org/docs/spec/client_server/r0.6.0#m-room-key
type RoomKeyEventContent struct {
Algorithm id.Algorithm `json:"algorithm"`
RoomID id.RoomID `json:"room_id"`
SessionID id.SessionID `json:"session_id"`
SessionKey string `json:"session_key"`
}
// ForwardedRoomKeyEventContent represents the content of a m.forwarded_room_key to_device event.
// https://matrix.org/docs/spec/client_server/r0.6.0#m-forwarded-room-key
type ForwardedRoomKeyEventContent struct {
RoomKeyEventContent
SenderKey id.SenderKey `json:"sender_key"`
SenderClaimedKey id.Ed25519 `json:"sender_claimed_ed25519_key"`
ForwardingKeyChain []string `json:"forwarding_curve25519_key_chain"`
}
type KeyRequestAction string
const (
KeyRequestActionRequest = "request"
KeyRequestActionCancel = "request_cancellation"
)
// RoomKeyRequestEventContent represents the content of a m.room_key_request to_device event.
// https://matrix.org/docs/spec/client_server/r0.6.0#m-room-key-request
type RoomKeyRequestEventContent struct {
Body RequestedKeyInfo `json:"body"`
Action KeyRequestAction `json:"action"`
RequestingDeviceID id.DeviceID `json:"requesting_device_id"`
RequestID string `json:"request_id"`
}
type RequestedKeyInfo struct {
Algorithm id.Algorithm `json:"algorithm"`
RoomID id.RoomID `json:"room_id"`
SenderKey id.SenderKey `json:"sender_key"`
SessionID id.SessionID `json:"session_id"`
}
type RoomKeyWithheldCode string
const (
RoomKeyWithheldBlacklisted RoomKeyWithheldCode = "m.blacklisted"
RoomKeyWithheldUnverified RoomKeyWithheldCode = "m.unverified"
RoomKeyWithheldUnauthorized RoomKeyWithheldCode = "m.unauthorized"
RoomKeyWithheldUnavailable RoomKeyWithheldCode = "m.unavailable"
RoomKeyWithheldNoOlmSession RoomKeyWithheldCode = "m.no_olm"
)
type RoomKeyWithheldEventContent struct {
RoomID id.RoomID `json:"room_id,omitempty"`
Algorithm id.Algorithm `json:"algorithm"`
SessionID id.SessionID `json:"session_id,omitempty"`
SenderKey id.SenderKey `json:"sender_key"`
Code RoomKeyWithheldCode `json:"code"`
Reason string `json:"reason,omitempty"`
}
type DummyEventContent struct{}