From 83907ec02b8fb242c33bf33bbd0c0d0bc5cd3496 Mon Sep 17 00:00:00 2001
From: Esa-Matti Suuronen <esa-matti@suuronen.org>
Date: Tue, 7 May 2019 17:17:41 +0300
Subject: [PATCH] Die with error message when using too old Polylang version

---
 wp-graphql-polylang.php | 105 ++++++++++++++++++++++++----------------
 1 file changed, 62 insertions(+), 43 deletions(-)

diff --git a/wp-graphql-polylang.php b/wp-graphql-polylang.php
index 34a5dcd..53b1b8a 100644
--- a/wp-graphql-polylang.php
+++ b/wp-graphql-polylang.php
@@ -12,6 +12,8 @@
 
 namespace WPGraphQL\Extensions\Polylang;
 
+use GraphQL\Error\UserError;
+
 define('WPGRAPHQL_POLYLANG', true);
 
 require_once __DIR__ . '/src/Helpers.php';
@@ -22,63 +24,80 @@
 require_once __DIR__ . '/src/TermObject.php';
 require_once __DIR__ . '/src/MenuItem.php';
 
-function isGraphqlContext()
+class Loader
 {
-    if (!defined('POLYLANG_VERSION')) {
-        return false;
-    }
+    private $pll_context_called = false;
 
-    if (defined('GRAPHQL_POLYLANG_TESTS')) {
-        return true;
+    function init()
+    {
+        add_filter('pll_model', [$this, 'get_pll_model'], 10, 1);
+        add_filter('pll_context', [$this, 'get_pll_context'], 10, 1);
+        add_action('graphql_init', [$this, 'graphql_polylang_init']);
     }
 
-    if (defined('GRAPHQL_HTTP_REQUEST')) {
-        return GRAPHQL_HTTP_REQUEST;
-    }
+    function graphql_polylang_init()
+    {
+        if (!$this->is_graphql_request()) {
+            return;
+        }
 
-    // XXX GRAPHQL_HTTP_REQUEST is not defined early enough!
-    if ('/graphql' == $_SERVER['REQUEST_URI']) {
-        return true;
-    }
+        if (!$this->pll_context_called) {
+            \http_response_code(500);
+            $msg =
+                'wp-graphql-polylang: You are using too old Polylang version. You must use one that implements pll_context filter https://github.com/polylang/polylang/commit/2203b9e16532797fa530f9b73024b53885d728ef';
+            error_log($msg);
+            die($msg);
+        }
 
-    return false;
-}
+        (new PolylangTypes())->init();
+        (new PostObject())->init();
+        (new TermObject())->init();
+        (new LanguageRootQueries())->init();
+        (new MenuItem())->init();
+        (new StringsTranslations())->init();
+    }
 
-add_filter(
-    'pll_model',
-    function ($class) {
-        if (isGraphqlContext()) {
+    function get_pll_model($class)
+    {
+        if ($this->is_graphql_request()) {
             return 'PLL_Admin_Model';
         }
 
         return $class;
-    },
-    10,
-    1
-);
-
-add_filter(
-    'pll_context',
-    function ($class) {
-        if (isGraphqlContext()) {
+    }
+
+    function get_pll_context($class)
+    {
+        $this->pll_context_called = true;
+
+        if ($this->is_graphql_request()) {
             return 'PLL_Admin';
         }
 
         return $class;
-    },
-    10,
-    1
-);
-
-add_action('graphql_init', function () {
-    if (!isGraphqlContext()) {
-        return;
     }
 
-    (new PolylangTypes())->init();
-    (new PostObject())->init();
-    (new TermObject())->init();
-    (new LanguageRootQueries())->init();
-    (new MenuItem())->init();
-    (new StringsTranslations())->init();
-});
+    function is_graphql_request()
+    {
+        if (!defined('POLYLANG_VERSION')) {
+            return false;
+        }
+
+        if (defined('GRAPHQL_POLYLANG_TESTS')) {
+            return true;
+        }
+
+        if (defined('GRAPHQL_HTTP_REQUEST')) {
+            return GRAPHQL_HTTP_REQUEST;
+        }
+
+        // XXX GRAPHQL_HTTP_REQUEST is not defined early enough!
+        if ('/graphql' == $_SERVER['REQUEST_URI']) {
+            return true;
+        }
+
+        return false;
+    }
+}
+
+(new Loader())->init();