fix: Always redirect to an absolute URL

Signed-off-by: Côme Chilliet <come.chilliet@nextcloud.com>

Author: come-nc

core/src/components/login/PasswordLessLoginForm.vue

@@ -47,6 +47,7 @@
 
 <script type="ts">
 import { browserSupportsWebAuthn } from '@simplewebauthn/browser'
+import { getBaseUrl } from '@nextcloud/router'
 import { defineComponent } from 'vue'
 import {
 	NoValidCredentials,
@@ -136,9 +137,15 @@ export default defineComponent({
 
 			return finishAuthentication(challenge)
 				.then(({ defaultRedirectUrl }) => {
-					console.debug('Logged in redirecting')
-					// Redirect url might be false so || should be used instead of ??.
-					window.location.href = redirectUrl || defaultRedirectUrl
+					logger.debug('Logged in redirecting')
+					if (redirectUrl) {
+						if (redirectUrl.charAt(0) !== "/") {
+							redirectUrl = "/" + redirectUrl;
+						}
+						window.location.href = getBaseUrl() + redirectUrl
+					} else {
+						window.location.href = defaultRedirectUrl
+					}
 				})
 				.catch(error => {
 					console.debug('GOT AN ERROR WHILE SUBMITTING CHALLENGE!')