D7271.diff
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	diff --git a/keyserver/src/keyserver.js b/keyserver/src/keyserver.js
	--- a/keyserver/src/keyserver.js
	+++ b/keyserver/src/keyserver.js
	@@ -42,6 +42,8 @@
	getCommAppURLFacts,
	} from './utils/urls.js';

	+const inviteSecretRegex = /^[a-z0-9]+$/i;
	+
	(async () => {
	await olm.init();
	await prefetchAllURLFacts();
	@@ -128,12 +130,17 @@
	// should redirect the user to a place from which the app can be
	// downloaded.
	router.get('/invite/:secret', (req, res) => {
	+ const { secret } = req.params;
	const userAgent = req.get('User-Agent');
	const detectionResult = detectBrowser(userAgent);
	- const redirectUrl =
	- detectionResult.os === 'Android OS'
	- ? stores.googlePlayUrl
	- : stores.appStoreUrl;
	+ let redirectUrl = stores.appStoreUrl;
	+ if (detectionResult.os === 'Android OS') {
	+ const isSecretValid = inviteSecretRegex.test(secret);
	+ const referrer = isSecretValid
	+ ? `&referrer=${encodeURIComponent(`utm_source=invite/${secret}`)}`
	+ : '';
	+ redirectUrl = `${stores.googlePlayUrl}${referrer}`;
	+ }
	res.writeHead(301, {
	Location: redirectUrl,
	});