fix autosubmit vulnerability for "favorite" bookmarklet

closes #69

controllers/controllers.php

@@ -34,12 +34,12 @@ function require_login(&$app, $redirect=true) {
   }
 }
 
-function generate_login_token() {
-  return JWT::encode(array(
+function generate_login_token($opts=[]) {
+  return JWT::encode(array_merge([
     'user_id' => $_SESSION['user_id'],
     'me' => $_SESSION['me'],
     'created_at' => time()
-  ), Config::$jwtSecret);
+  ], $opts), Config::$jwtSecret);
 }
 
 $app->get('/dashboard', function() use($app) {
@@ -130,11 +130,23 @@ $app->get('/favorite', function() use($app) {
     if(array_key_exists('url', $params))
       $url = $params['url'];
 
+    // Check if there was a login token in the query string and whether it has autosubmit=true
+    $autosubmit = false;
+
+    if(array_key_exists('token', $params)) {
+      try {
+        $data = JWT::decode($params['token'], Config::$jwtSecret, ['HS256']);
+        $autosubmit = isset($data->autosubmit) && $data->autosubmit;
+      } catch(Exception $e) {
+      }
+    }
+
     render('new-favorite', array(
       'title' => 'New Favorite',
       'url' => $url,
-      'token' => generate_login_token(),
-      'authorizing' => false
+      'token' => generate_login_token(['autosubmit'=>true]),
+      'authorizing' => false,
+      'autosubmit' => $autosubmit
     ));
   }
 });

views/new-favorite.php

@@ -31,12 +31,6 @@
 <script>
 $(function(){
 
-  var autosubmit = window.location.search.match('autosubmit=true');
-
-  if(autosubmit) {
-    $(".footer, #bookmarklet").hide();
-  }
-
   $("#btn_post").click(function(){
     $("#btn_post").addClass("loading disabled").text("Working...");
 
@@ -50,13 +44,9 @@ $(function(){
     }, function(response){
       if(response.location != false) {
 
-        if(autosubmit) {
-          $("#btn_post").hide();
-        } else {
-          $("#test_success").removeClass('hidden');
-          $("#test_error").addClass('hidden');
-          $("#post_href").attr("href", response.location);
-        }
+        $("#test_success").removeClass('hidden');
+        $("#test_error").addClass('hidden');
+        $("#post_href").attr("href", response.location);
 
         window.location = response.location;
       } else {
@@ -69,9 +59,10 @@ $(function(){
     return false;
   });
 
-  if(autosubmit) {
+  <? if($this->autosubmit): ?>
+    $(".footer, #bookmarklet").hide();
     $("#btn_post").click();
-  }
+  <? endif ?>
 
   bind_syndication_buttons();
 });

views/partials/favorite-bookmarklet.php

@@ -1,3 +1,3 @@
 (function(){
-  window.open("<?= Config::$base_url ?>favorite?url="+encodeURIComponent(window.location.href)+"&autosubmit=true&token=<?= $this->token ?>");
+  window.open("<?= Config::$base_url ?>favorite?url="+encodeURIComponent(window.location.href)+"&token=<?= $this->token ?>");
 })();