Don't accidentally prompt people to make a second account (#594)

* Don't accidentally prompt people to make a second account

* Auth within add_player api call

* Apply fixes from StyleCI

---------

Co-authored-by: StyleCI Bot <bot@styleci.io>

gatherling/api.php

@@ -26,9 +26,12 @@
 
     case 'eventinfo':
     case 'event_info':
-        $eventname = $_REQUEST['event'];
-        $event = new Event($eventname);
-        $result = repr_json_event($event);
+        if (Event::exists(arg('event'))) {
+            $event = new Event(arg('event'));
+            $result = repr_json_event($event);
+        } else {
+            $result['error'] = 'Event not found';
+        }
         break;
 
     case 'seriesinfo':
@@ -47,6 +50,7 @@
 
     case 'addplayer':
     case 'add_player':
+        auth();
         $event = new Event(arg('event'));
         $player = arg('addplayer');
         $decklist = arg('decklist', '');

gatherling/auth.php

@@ -151,6 +151,9 @@ function prompt_link_account($user)
 
             <form action="register.php" method="post">
                 <table class="form" align="center" style="border-width: 0px" cellpadding="3">
+                    <tr>
+                        <td colspan="2">If you already have a Gatherling account, please <a href="login.php?target=auth.php">Log In</a> in with your password, and link via Player Settings.</td>
+                    </tr>
                     <tr>
                         <th>Username</th>
                         <td><input id="username" class="inputbox" type="text" name="username" value="" tabindex="1"></td>