D4587.id14774.diff
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	diff --git a/web/utils/device-uuid.js b/web/utils/device-uuid.js
	new file mode 100644
	--- /dev/null
	+++ b/web/utils/device-uuid.js
	@@ -0,0 +1,24 @@
	+// @flow
	+import crypto from 'crypto';
	+
	+export const deviceUUIDTypes = Object.freeze({
	+ KEYSERVER: 0,
	+ WEB: 1,
	+ MOBILE: 2,
	+});
	+export type DeviceUUIDType = $Values<typeof deviceUUIDTypes>;
	+
	+function getDeviceUUID(type: DeviceUUIDType): string {
	+ const uuidSuffix = crypto.randomBytes(32).toString('hex');
	+
	+ if (type === deviceUUIDTypes.KEYSERVER) {
	+ return `ks-${uuidSuffix}`;
	+ } else if (type === deviceUUIDTypes.WEB) {
	+ return `web-${uuidSuffix}`;
	+ } else if (type === deviceUUIDTypes.MOBILE) {
	+ return `mobile-${uuidSuffix}`;
	+ }
	+ return '';
	+}
	+
	+export { getDeviceUUID };