fix: accidental early return in confirmByCode, tests, race condition

A race condition caused mongo/psql tests to fail.

src/user/email.js

@@ -126,14 +126,12 @@ UserEmail.confirmByCode = async function (code) {
 	let oldEmail = await user.getUserField(confirmObj.uid, 'email');
 	if (oldEmail) {
 		oldEmail = oldEmail || '';
-		if (oldEmail === confirmObj.email) {
+		if (oldEmail !== confirmObj.email) {
-			return;
+			await db.sortedSetRemove('email:uid', oldEmail.toLowerCase());
+			await db.sortedSetRemove('email:sorted', `${oldEmail.toLowerCase()}:${confirmObj.uid}`);
+			await user.auth.revokeAllSessions(confirmObj.uid);
+			await events.log('email-change', { oldEmail, newEmail: confirmObj.email });
 		}
-
-		await db.sortedSetRemove('email:uid', oldEmail.toLowerCase());
-		await db.sortedSetRemove('email:sorted', `${oldEmail.toLowerCase()}:${confirmObj.uid}`);
-		await user.auth.revokeAllSessions(confirmObj.uid);
-		await events.log('email-change', { oldEmail, newEmail: confirmObj.email });
 	}
 
 	await Promise.all([

src/user/invite.js

@@ -42,7 +42,8 @@ module.exports = function (User) {
 
 		const email_exists = await User.getUidByEmail(email);
 		if (email_exists) {
-			throw new Error('[[error:email-taken]]');
+			// Silently drop the invitation if the invited email already exists locally
+			return true;
 		}
 
 		const invitation_exists = await db.exists(`invitation:uid:${uid}:invited:${email}`);

test/user.js

@@ -975,11 +975,10 @@ describe('User', () => {
 			const uid = await User.create({ username: longName });
 			await socketUser.changeUsernameEmail({ uid: uid }, { uid: uid, username: longName, email: 'verylong@name.com' });
 			const userData = await db.getObject(`user:${uid}`);
-			assert.strictEqual(userData.username, longName);
+			const awaitingValidation = await User.email.isValidationPending(uid, 'verylong@name.com');
 
-			const event = (await events.getEvents('email-confirmation-sent', 0, 0)).pop();
+			assert.strictEqual(userData.username, longName);
-			assert.strictEqual(parseInt(event.uid, 10), uid);
+			assert.strictEqual(awaitingValidation, true);
-			assert.strictEqual(event.email, 'verylong@name.com');
 		});
 
 		it('should not update a user\'s username if it did not change', (done) => {
@@ -2048,6 +2047,7 @@ describe('User', () => {
 					async.apply(groups.create, { name: OWN_PRIVATE_GROUP, ownerUid: inviterUid, private: 1 }),
 					async.apply(groups.join, 'administrators', adminUid),
 					async.apply(groups.join, 'cid:0:privileges:invite', inviterUid),
+					async.apply(User.email.confirmByUid, inviterUid),
 				], done);
 			});
 		});
@@ -2181,10 +2181,12 @@ describe('User', () => {
 				assert.strictEqual(numInvites, 0);
 			});
 
-			it('should error if email exists', async () => {
+			it('should succeed if email exists but not actually send an invite', async () => {
 				const { res } = await helpers.invite({ emails: 'inviter@nodebb.org', groupsToJoin: [] }, inviterUid, jar, csrf_token);
-				assert.strictEqual(res.statusCode, 400);
+				const numInvites = await User.getInvitesNumber(adminUid);
-				assert.strictEqual(res.body.status.message, 'Email taken');
+
+				assert.strictEqual(res.statusCode, 200);
+				assert.strictEqual(numInvites, 0);
 			});
 		});