Fix loginflow with apptoken enter on iOS

It seems iOS doesn't like us to change the location. So now we submit it
to the server that geneartes the redirect.

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

core/Controller/ClientFlowLoginController.php

@@ -327,6 +327,18 @@ class ClientFlowLoginController extends Controller {
 		return new Http\RedirectResponse($redirectUri);
 	}
 
+	/**
+	 * @PublicPage
+	 */
+	public function apptokenRedirect(string $stateToken, string $user, string $password) {
+		if (!$this->isValidToken($stateToken)) {
+			return $this->stateTokenForbiddenResponse();
+		}
+
+		$redirectUri = 'nc://login/server:' . $this->getServerPath() . '&user:' . urlencode($user) . '&password:' . urlencode($password);
+		return new Http\RedirectResponse($redirectUri);
+	}
+
 	private function getServerPath(): string {
 		$serverPostfix = '';
 

core/js/login/authpicker.js

@@ -5,12 +5,4 @@ jQuery(document).ready(function() {
 		$('#redirect-link').addClass('hidden');
 		$('#app-token-login-field').removeClass('hidden');
 	});
-
-	$('#submit-app-token-login').click(function(e) {
-		e.preventDefault();
-		window.location.href = 'nc://login/server:'
-			+ encodeURIComponent($('#serverHost').val())
-			+ "&user:" +  encodeURIComponent($('#user').val())
-			+ "&password:" + encodeURIComponent($('#password').val());
-	});
 });

core/routes.php

@@ -54,6 +54,7 @@ $application->registerRoutes($this, [
 		['name' => 'ClientFlowLogin#showAuthPickerPage', 'url' => '/login/flow', 'verb' => 'GET'],
 		['name' => 'ClientFlowLogin#generateAppPassword', 'url' => '/login/flow', 'verb' => 'POST'],
 		['name' => 'ClientFlowLogin#grantPage', 'url' => '/login/flow/grant', 'verb' => 'GET'],
+		['name' => 'ClientFlowLogin#apptokenRedirect', 'url' => '/login/flow/apptoken', 'verb' => 'POST'],
 		['name' => 'TwoFactorChallenge#selectChallenge', 'url' => '/login/selectchallenge', 'verb' => 'GET'],
 		['name' => 'TwoFactorChallenge#showChallenge', 'url' => '/login/challenge/{challengeProviderId}', 'verb' => 'GET'],
 		['name' => 'TwoFactorChallenge#solveChallenge', 'url' => '/login/challenge/{challengeProviderId}', 'verb' => 'POST'],

core/templates/loginflow/authpicker.php

@@ -44,7 +44,7 @@ $urlGenerator = $_['urlGenerator'];
 		</a>
 	</p>
 
-	<fieldset id="app-token-login-field" class="hidden">
+	<form action="<?php p($urlGenerator->linkToRouteAbsolute('core.ClientFlowLogin.apptokenRedirect')); ?>" method="post" id="app-token-login-field" class="hidden">
 		<p class="grouptop">
 			<input type="text" name="user" id="user" placeholder="<?php p($l->t('Username')) ?>">
 			<label for="user" class="infield"><?php p($l->t('Username')) ?></label>
@@ -53,9 +53,10 @@ $urlGenerator = $_['urlGenerator'];
 			<input type="password" name="password" id="password" placeholder="<?php p($l->t('App token')) ?>">
 			<label for="password" class="infield"><?php p($l->t('Password')) ?></label>
 		</p>
-		<input type="hidden" id="serverHost" value="<?php p($_['serverHost']) ?>" />
+		<input type="hidden" name="stateToken" value="<?php p($_['stateToken']) ?>" />
+		<input type="hidden" name="requesttoken" value="<?php p($_['requesttoken']) ?>">
 		<input id="submit-app-token-login" type="submit" class="login primary icon-confirm-white" value="<?php p($l->t('Grant access')) ?>">
-	</fieldset>
+	</form>
 </div>
 
 <?php if(empty($_['oauthState'])): ?>