chore: moved proxy classes to different folder and namespaces

lib/Proxy/ShlinkProxy.php

@@ -0,0 +1,75 @@
+<?php declare(strict_types=1);
+/**
+ * PrivateBin
+ *
+ * a zero-knowledge paste bin
+ *
+ * @link      https://github.com/PrivateBin/PrivateBin
+ * @copyright 2012 Sébastien SAUVAGE (sebsauvage.net)
+ * @license   https://www.opensource.org/licenses/zlib-license.php The zlib/libpng License
+ */
+
+namespace PrivateBin\Proxy;
+
+use PrivateBin\Configuration;
+use PrivateBin\Json;
+
+/**
+ * ShlinkProxy
+ *
+ * Forwards a URL for shortening to shlink and stores the result.
+ */
+class ShlinkProxy extends AbstractProxy
+{
+    /**
+     * Overrides the abstract parent function to get the proxy URL.
+     *
+     * @param Configuration $conf
+     * @return string
+     */
+    protected function _getProxyUrl(Configuration $conf): string
+    {
+        return $conf->getKey('apiurl', 'shlink');
+    }
+
+    /**
+     * Overrides the abstract parent function to get contents from Shlink API.
+     *
+     * @access protected
+     * @param Configuration $conf
+     * @param string $link
+     * @return array
+     */
+    protected function _getProxyPayload(Configuration $conf, string $link): array
+    {
+        $shlink_api_key = $conf->getKey('apikey', 'shlink');
+
+        $body = array(
+            'longUrl' => $link,
+        );
+
+        return array(
+            'method'  => 'POST',
+            'header'  => "Content-Type: application/json\r\n" .
+                         'X-Api-Key: ' . $shlink_api_key . "\r\n",
+            'content' => Json::encode($body),
+        );
+    }
+
+    /**
+     * Extracts the short URL from the shlink API response.
+     *
+     * @access protected
+     * @param array $data
+     * @return ?string
+     */
+    protected function _extractShortUrl(array $data): ?string
+    {
+        if (
+            array_key_exists('shortUrl', $data)
+        ) {
+            return $data['shortUrl'];
+        }
+        return null;
+    }
+}