Multi backend plugin

• Add backend class.
• Add php docstrings.
• Hide multipart from public API.

includes/class-http-backend.php

@@ -4,42 +4,72 @@ namespace WPCT_HTTP;
 
 use Exception;
 
+/**
+ * HTTP Backend
+ *
+ * @since 3.0.0
+ */
 class Http_Backend
 {
-    private $backend = null;
+    /**
+     * Handle backend data.
+     *
+     * @since 3.0.0
+     */
+    private $data = null;
 
+    /**
+     * Store backend data
+     *
+     * @since 3.0.0
+     */
     public function __construct($name)
     {
-        $this->backend = $this->get_backend($name);
-        if (!$this->backend) {
+        $this->data = $this->get_backend($name);
+        if (!$this->data) {
             throw new Exception("Http backend error: Unkown backend with name {$name}");
         }
     }
 
+    /**
+     * Backend data getter.
+     *
+     * @since 3.0.0
+     */
     private function get_backend($name)
     {
-        $setting = get_option('wpct-http-bridge_general');
-        if (!isset($setting['backends'])) {
-            return null;
-        }
-
-        $backends = $setting['backends'];
+        $backends = Settings::get_setting('wpct-http-bridge', 'general', 'backends');
         foreach ($backends as $backend) {
             if ($backend['name'] === $name) {
                 return $backend;
             }
         }
+
+        return null;
     }
 
+    /**
+     * Intercept class gets and lookup on backend data.
+     *
+     * @since 3.0.0
+     */
     public function __get($attr)
     {
-        if (isset($this->backend[$attr])) {
-            return $this->backend[$attr];
+        if (isset($this->data[$attr])) {
+            return $this->data[$attr];
         }
 
         return null;
     }
 
+    /**
+     * Get backend absolute URL.
+     *
+     * @since 3.0.0
+     *
+     * @param string $path URL relative path.
+     * @return string $url Absolute URL.
+     */
     public function get_endpoint_url($path)
     {
         $url_data = parse_url($path);
@@ -48,21 +78,28 @@ class Http_Backend
         }
 
         $base_url = $this->base_url;
-        return preg_replace('/\/$', '', $base_url) . '/' . preg_replace('/^\//', '', $path);
+        return preg_replace('/\/$/', '', $base_url) . '/' . preg_replace('/^\//', '', $path);
     }
 
+    /**
+     * Get backend default headers.
+     *
+     * @since 3.0.0
+     *
+     * @return array $headers Backend headers.
+     */
     public function get_headers()
     {
         $headers = [];
         foreach ($this->headers as $header) {
-            [$name, $value] = explode(':', $header);
-            $headers[strtolower(trim($name))] = trim($value);
+            $headers[strtolower(trim($header['name']))] = trim($header['value']);
         }
 
         return $headers;
     }
 }
 
+// Get new backend instance.
 add_filter('wpct_http_backend', function ($null, $name) {
     return new Http_Backend($name);
 }, 10, 2);