Initial commit

public/kirby/src/Cms/LanguageRouter.php

@@ -0,0 +1,125 @@
+<?php
+
+namespace Kirby\Cms;
+
+use Exception;
+use Kirby\Exception\NotFoundException;
+use Kirby\Http\Router;
+use Kirby\Toolkit\A;
+use Kirby\Toolkit\Str;
+
+/**
+ * The language router is used internally
+ * to handle language-specific (scoped) routes
+ *
+ * @package   Kirby Cms
+ * @author    Bastian Allgeier <bastian@getkirby.com>
+ * @link      https://getkirby.com
+ * @copyright Bastian Allgeier
+ * @license   https://getkirby.com/license
+ */
+class LanguageRouter
+{
+	protected Router $router;
+
+	/**
+	 * Creates a new language router instance
+	 * for the given language
+	 */
+	public function __construct(
+		protected Language $language
+	) {
+	}
+
+	/**
+	 * Fetches all scoped routes for the
+	 * current language from the Kirby instance
+	 *
+	 * @throws \Kirby\Exception\NotFoundException
+	 */
+	public function routes(): array
+	{
+		$language = $this->language;
+		$kirby    = $language->kirby();
+		$routes   = $kirby->routes();
+
+		// only keep the scoped language routes
+		$routes = array_values(array_filter($routes, function ($route) use ($language) {
+			// no language scope
+			if (empty($route['language']) === true) {
+				return false;
+			}
+
+			// wildcard
+			if ($route['language'] === '*') {
+				return true;
+			}
+
+			// get all applicable languages
+			$languages = Str::split(strtolower($route['language']), '|');
+
+			// validate the language
+			return in_array($language->code(), $languages) === true;
+		}));
+
+		// add the page-scope if necessary
+		foreach ($routes as $index => $route) {
+			if ($pageId = ($route['page'] ?? null)) {
+				if ($page = $kirby->page($pageId)) {
+					// convert string patterns to arrays
+					$patterns = A::wrap($route['pattern']);
+
+					// prefix all patterns with the page slug
+					$patterns = A::map(
+						$patterns,
+						fn ($pattern) => $page->uri($language) . '/' . $pattern
+					);
+
+					// re-inject the pattern and the full page object
+					$routes[$index]['pattern'] = $patterns;
+					$routes[$index]['page']    = $page;
+				} else {
+					throw new NotFoundException('The page "' . $pageId . '" does not exist');
+				}
+			}
+		}
+
+		return $routes;
+	}
+
+	/**
+	 * Wrapper around the Router::call method
+	 * that injects the Language instance and
+	 * if needed also the Page as arguments.
+	 */
+	public function call(string|null $path = null): mixed
+	{
+		$language       = $this->language;
+		$kirby          = $language->kirby();
+		$this->router ??= new Router($this->routes());
+
+		try {
+			return $this->router->call($path, $kirby->request()->method(), function ($route) use ($kirby, $language) {
+				$kirby->setCurrentTranslation($language);
+				$kirby->setCurrentLanguage($language);
+
+				if ($page = $route->page()) {
+					return $route->action()->call(
+						$route,
+						$language,
+						$page,
+						...$route->arguments()
+					);
+				}
+
+				return $route->action()->call(
+					$route,
+					$language,
+					...$route->arguments()
+				);
+			});
+		} catch (Exception) {
+			return $kirby->resolve($path, $language->code());
+		}
+	}
+}