Add context dependency container

inc/context.php

@@ -0,0 +1,28 @@
+<?php
+namespace Vichan;
+
+defined('TINYBOARD') or exit;
+
+use Vichan\Driver\{HttpDriver, HttpDrivers};
+
+
+interface Context {
+	public function getHttpDriver(): HttpDriver;
+}
+
+class AppContext implements Context {
+	private array $config;
+	private ?HttpDriver $http;
+
+
+	public function __construct(array $config) {
+		$this->config = $config;
+	}
+
+	public function getHttpDriver(): HttpDriver {
+		if (is_null($this->http)) {
+			$this->http = HttpDrivers::getHttpDriver($this->config['upload_by_url_timeout'], $this->config['max_filesize']);
+		}
+		return $this->http;
+	}
+}