Use GitHub API v4 (GraphQL) to fetch star count

Fixes #221

Author: philwareham

src/templates/pages/default.txp

@@ -68,13 +68,31 @@
                         <a class="button" rel="external" href="https://github.com/textpattern/textpattern/" title="Stars on GitHub"><span class="ui-icon ui-extra-icon-github">GitHub</span> <strong>Stars</strong></a>
                         <txp:etc_cache id="github-stars" time="-3600">
                             <txp:php>
+global $variable;
+
+$query = <<<'GRAPHQL'
+query {
+  repository(owner:textpattern, name:textpattern) {
+    stargazers {
+      totalCount
+    }
+  }
+}
+GRAPHQL;
+
+$json = json_encode(['query' => $query]);
 $curl = curl_init();
 
 curl_setopt_array($curl, [
     CURLOPT_RETURNTRANSFER => true,
-    CURLOPT_URL => 'https://api.github.com/repos/textpattern/textpattern',
-    CURLOPT_USERAGENT => 'Textpattern CMS',
+    CURLOPT_URL => 'https://api.github.com/graphql',
     CURLOPT_FAILONERROR => true,
+    CURLOPT_POSTFIELDS => $json,
+    CURLOPT_HTTPHEADER => array(
+        'User-Agent: Textpattern CMS',
+        'Content-Type: application/json;charset=utf-8',
+        'Authorization: bearer '.$variable['github-api-key']
+    ),
 ]);
 
 $response = curl_exec($curl);
@@ -89,7 +107,7 @@ if (!($json = json_decode($response))) {
     return;
 }
 
-echo '<a class="count-bubble" rel="external" href="https://github.com/textpattern/textpattern/stargazers" title="Stargazers on GitHub">'.intval($json->stargazers_count).'</a>';
+echo '<a class="count-bubble" rel="external" href="https://github.com/textpattern/textpattern/stargazers" title="Stargazers on GitHub">'.intval($json->data->repository->stargazers->totalCount).'</a>';
                             </txp:php>
                         </txp:etc_cache>
                     </p>