- First commit of this smallish kernel

src/Kernel.php

@@ -0,0 +1,134 @@
+<?php declare(strict_types=1);
+
+namespace Lean;
+
+use Dotenv\Dotenv;
+
+use DI\ContainerBuilder,
+    DI\Container;
+
+use League\Route\Strategy\ApplicationStrategy;
+
+use Psr\Http\Message\ServerRequestInterface;
+
+use Zend\Diactoros\ServerRequestFactory,
+    Zend\HttpHandlerRunner\Emitter\EmitterInterface;
+
+class Kernel {
+
+    protected Container $container;
+
+    protected string $locale;
+
+    public array $paths = [];
+
+    public int $errorReporting = E_ALL & ~E_USER_DEPRECATED & ~E_DEPRECATED & ~E_STRICT & ~E_NOTICE;
+
+    public string $definitionFilePath;
+
+    public string $errorLogPath;
+
+    public string $projectPath;
+
+    public string $routeDefinitionList = 'routes.list';
+
+    public function __construct(string $projectPath)
+    {
+        $this->projectPath = $projectPath;
+
+        $this->setEnvironment();
+        $this->initializeEngine();
+        $this->setupContainer();
+        $this->serviceContainer();
+        $this->handleRequest();
+    }
+
+    public static function putenv($var, $value)
+    {
+        putenv("$var=$value");
+        $_ENV[$var] = $value;
+    }
+
+    protected function setEnvironment() {
+        static::putenv('PROJECT_PATH', $this->projectPath);
+
+        // Environment vars (accessible from \DI\env(), getenv(), $_ENV and $_SERVER)
+        Dotenv::create(getenv("PROJECT_PATH"))->load();
+
+        // Paths and directories
+        foreach($this->paths as $name => $envkey) {
+            static::putenv($name, realpath(getenv("PROJECT_PATH") . DIRECTORY_SEPARATOR . getenv($envkey)));
+        }
+
+        // Override using headers
+        foreach(['APP_ENV', 'DEBUG', ] as $env) {
+            if ( null !== $value = $_SERVER["HTTP_$env"] ?? null ) {
+                static::putenv($env, $value);
+            }
+        }
+    }
+
+    protected function initializeEngine() : self
+    {
+        # Defining default locale and timezone
+        date_default_timezone_set(getenv("DEFAULT_TIMEZONE"));
+
+        setlocale(LC_ALL, $this->locale = getenv("DEFAULT_LOCAL"));
+        setlocale(LC_TIME, getenv("DEFAULT_TIME"), getenv("DEFAULT_TIME_FALLBACK"));
+
+        ini_set("log_errors", "1");
+        ini_set("error_log", $this->errorLogPath);
+        ini_set('display_errors', getenv("DEBUG") ? 'on' : 'off');
+
+        error_reporting($this->errorReporting);
+
+        return $this;
+    }
+
+    protected function setupContainer() : self
+    {
+        $containerBuilder = new ContainerBuilder();
+
+        if (getenv("APP_ENV") === "prod") {
+            if (getenv("CACHE_PATH")) {
+                $containerBuilder->enableCompilation(getenv("CACHE_PATH") . "/di/");
+                $containerBuilder->writeProxiesToFile(true);
+            }
+        }
+
+        $containerBuilder->useAnnotations(false);
+
+        if ($this->definitionFilePath ?? false) {
+            $containerBuilder->addDefinitions(require($this->definitionFilePath));
+        }
+
+        $this->container = $containerBuilder->build();
+
+        return $this;
+    }
+
+    protected function serviceContainer() : self
+    {
+        return $this;
+    }
+
+    protected function handleRequest() : self
+    {
+        ServerRequestFactory::fromGlobals($_SERVER, $_GET, $_POST, $_COOKIE, $_FILES);
+
+        // Router
+        $routeFactory = $this->container->get($this->routeDefinitionList);
+
+        $router = $routeFactory($this->container);
+
+        $router->setStrategy($this->container->get(ApplicationStrategy::class));
+
+        // Handle requests
+        $response = $router->dispatch($this->container->get(ServerRequestInterface::class));
+
+        // Reply to clients
+        $this->container->get(EmitterInterface::class)->emit($response);
+
+        return $this;
+    }
+};