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diff --git a/keyserver/src/utils/olm-utils.js b/keyserver/src/utils/olm-utils.js
--- a/keyserver/src/utils/olm-utils.js
+++ b/keyserver/src/utils/olm-utils.js
@@ -27,6 +27,41 @@
const maxPublishedPrekeyAge = 30 * 24 * 60 * 60 * 1000;
const maxOldPrekeyAge = 24 * 60 * 60 * 1000;
+function getLastPrekeyPublishTime(account: OlmAccount): Date {
+ const olmLastPrekeyPublishTime = account.last_prekey_publish_time();
+
+ // Olm uses seconds, while in Node we need milliseconds.
+ return new Date(olmLastPrekeyPublishTime * 1000);
+}
+
+function shouldRotatePrekey(account: OlmAccount): boolean {
+ // Our fork of Olm only remembers two prekeys at a time.
+ // If the new one hasn't been published, then the old one is still active.
+ // In that scenario, we need to avoid rotating the prekey because it will
+ // result in the old active prekey being discarded.
+ if (account.unpublished_prekey()) {
+ return false;
+ }
+
+ const currentDate = new Date();
+ const lastPrekeyPublishDate = getLastPrekeyPublishTime(account);
+
+ return currentDate - lastPrekeyPublishDate >= maxPublishedPrekeyAge;
+}
+
+function shouldForgetPrekey(account: OlmAccount): boolean {
+ // Our fork of Olm only remembers two prekeys at a time.
+ // We have to hold onto the old one until the new one is published.
+ if (account.unpublished_prekey()) {
+ return false;
+ }
+
+ const currentDate = new Date();
+ const lastPrekeyPublishDate = getLastPrekeyPublishTime(account);
+
+ return currentDate - lastPrekeyPublishDate >= maxOldPrekeyAge;
+}
+
async function createPickledOlmAccount(): Promise<PickledOlmAccount> {
await olm.init();
const account = new olm.Account();
@@ -89,6 +124,7 @@
}
let cachedOLMUtility: OlmUtility;
+
function getOlmUtility(): OlmUtility {
if (cachedOLMUtility) {
return cachedOLMUtility;
@@ -98,23 +134,10 @@
}
function validateAccountPrekey(account: OlmAccount) {
- const currentDate = new Date();
- const lastPrekeyPublishDate = new Date(account.last_prekey_publish_time());
-
- const prekeyPublished = !account.unpublished_prekey();
- if (
- prekeyPublished &&
- currentDate - lastPrekeyPublishDate > maxPublishedPrekeyAge
- ) {
- // If there is no prekey or the current prekey is older than month
- // we need to generate new one.
+ if (shouldRotatePrekey(account)) {
account.generate_prekey();
}
-
- if (
- prekeyPublished &&
- currentDate - lastPrekeyPublishDate >= maxOldPrekeyAge
- ) {
+ if (shouldForgetPrekey(account)) {
account.forget_old_prekey();
}
}

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