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Keep room key with earliest index

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This commit is contained in:
Bruno Windels 2020-09-14 14:19:35 +02:00
parent 9fad5b3b29
commit a2f8731a23
1 changed files with 19 additions and 8 deletions
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27
src/matrix/e2ee/megolm/Decryption.js
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@ -138,12 +138,23 @@ export class Decryption {
return;
}
// TODO: compare first_known_index to see which session to keep
const hasSession = await txn.inboundGroupSessions.has(roomId, senderKey, sessionId);
if (!hasSession) {
const session = new this._olm.InboundGroupSession();
try {
session.create(sessionKey);
const session = new this._olm.InboundGroupSession();
try {
session.create(sessionKey);
let incomingSessionIsBetter = true;
const existingSessionEntry = await txn.inboundGroupSessions.get(roomId, senderKey, sessionId);
if (existingSessionEntry) {
const existingSession = new this._olm.InboundGroupSession();
try {
existingSession.unpickle(this._pickleKey, existingSessionEntry.session);
incomingSessionIsBetter = session.first_known_index() < existingSession.first_known_index();
} finally {
existingSession.free();
}
}
if (incomingSessionIsBetter) {
const sessionEntry = {
roomId,
senderKey,
@ -153,9 +164,9 @@ export class Decryption {
};
txn.inboundGroupSessions.set(sessionEntry);
newSessions.push(sessionEntry);
} finally {
session.free();
}
} finally {
session.free();
}
}