From 5f602f2af23023c39829b262b98f101fa93e95f0 Mon Sep 17 00:00:00 2001
From: Sam Serrien <sam@genx.be>
Date: Wed, 7 Apr 2021 14:37:07 +0200
Subject: [PATCH] Update plugin with longlived token and refresh functionality

---
 classes/Instagram.php | 113 ++++++++++++++++++++++++++++++++++--------
 1 file changed, 92 insertions(+), 21 deletions(-)

diff --git a/classes/Instagram.php b/classes/Instagram.php
index b69bfd1..cb1cc8d 100644
--- a/classes/Instagram.php
+++ b/classes/Instagram.php
@@ -4,6 +4,8 @@
 class Instagram
 {
     private $db;
+    private $token;
+    private $tokenRefreshed;
 
     public function __construct()
     {
@@ -24,6 +26,7 @@ public function __construct()
 
         $this->db = kirby()->root('assets').DS.option('genxbe.instagram.assetFolder').DS.option('genxbe.instagram.db');
         $this->token = site()->instagramToken();
+        $this->tokenRefreshed = page('sitesettings')->instagramTokenRefreshed();
     }
 
     public function feed()
@@ -33,32 +36,84 @@ public function feed()
 
     public function getToken()
     {
-        if(get('code'))
+        try
         {
-            $options = [
-                'headers' => [
-                    'Content-Type: application/x-www-form-urlencoded; charset=utf-8',
-                ],
-                'method' => 'POST',
-                'data' => http_build_query([
-                    'client_id' => option('genxbe.instagram.client_id'),
-                    'client_secret' => option('genxbe.instagram.client_secret'),
-                    'grant_type' => 'authorization_code',
-                    'redirect_uri' => option('genxbe.instagram.redirect_uri'),
-                    'code' => get('code'),
-                ]),
-            ];
-
-            $data = \Remote::request('https://api.instagram.com/oauth/access_token', $options);
+            if(get('code'))
+            {
+                $options = [
+                    'headers' => [
+                        'Content-Type: application/x-www-form-urlencoded; charset=utf-8',
+                    ],
+                    'method' => 'POST',
+                    'data' => http_build_query([
+                        'client_id' => option('genxbe.instagram.client_id'),
+                        'client_secret' => option('genxbe.instagram.client_secret'),
+                        'grant_type' => 'authorization_code',
+                        'redirect_uri' => option('genxbe.instagram.redirect_uri'),
+                        'code' => get('code'),
+                    ]),
+                ];
+
+                $data = \Remote::request('https://api.instagram.com/oauth/access_token', $options);
+
+                $access_token = $data->json()['access_token'];
+                $client_secret = option('genx.blocks-instagram.client_secret');
+
+                $data = \Remote::get("https://graph.instagram.com/access_token?grant_type=ig_exchange_token&client_secret={$client_secret}&access_token={$access_token}");
+
+                $access_token = $data->json()['access_token'];
+
+                site()->update([
+                    'instagramAuth' => (boolean)true,
+                    'instagramToken' => $data->json()['access_token'],
+                    'instagramTokenRefreshed' => date('Y-m-d'),
+                ]);
+
+                exec("php {__DIR__} fetch.php > /dev/null &");
+            }
+        }
+        catch(\Exception $e)
+        {
+            site()->update([
+                'instagramAuth' => (boolean)false,
+                'instagramToken' => '',
+            ]);
+        }
+
+        go(site()->panelUrl(), 303);
+    }
+
+    public function refreshToken()
+    {
+        $kirby = kirby();
+        $kirby->impersonate('kirby');
+
+        try
+        {
+            if(site()->instagramAuth()->isFalse())
+            {
+                exit;
+            }
+
+            $access_token = $this->token;
+            $client_secret = option('genxbe.instagram.client_secret');
+
+            $data = \Remote::get("https://graph.instagram.com/refresh_access_token?grant_type=ig_refresh_token&client_secret={$client_secret}&access_token={$access_token}");
+
+            $access_token = $data->json()['access_token'];
 
             site()->update([
                 'instagramAuth' => (boolean)true,
                 'instagramToken' => $data->json()['access_token'],
+                'instagramTokenRefreshed' => date('Y-m-d'),
+            ]);
+        }
+        catch(\Exception $e)
+        {
+            site()->update([
+                'instagramAuth' => (boolean)false,
+                'instagramToken' => '',
             ]);
-
-            exec("php {__DIR__} fetch.php > /dev/null &");
-
-            go(site()->panelUrl(), 303);
         }
     }
 
@@ -121,7 +176,7 @@ public function fetch()
             }
         }
 
-        $newDb = $db->limit(20);
+        $newDb = $db->sortBy('timestamp', 'desc');
 
         foreach(array_diff(scandir($path), array('.', '..')) as $file)
         {
@@ -132,6 +187,22 @@ public function fetch()
         }
 
         $this->writeDb($newDb);
+
+        if($this->dateDifference(date('Y-m-d'), $this->tokenRefreshed) > 50)
+        {
+            self::refreshToken();
+        }
+    }
+
+    private function dateDifference($date_1 , $date_2 , $differenceFormat = '%a' )
+    {
+        $datetime1 = date_create($date_1);
+        $datetime2 = date_create($date_2);
+
+        $interval = date_diff($datetime1, $datetime2);
+
+        return $interval->format($differenceFormat);
+
     }
 
     private function getDb()