SomeMWDev · SomeMWDev · Feb 15, 2026 · Jan 26, 2026 · Jan 26, 2026 · Jan 29, 2026
diff --git a/config/Defaults.php b/config/Defaults.php
@@ -109,6 +109,7 @@
 
 # Load other configuration
 
+require_once 'Farm/MWCFarm.php';
 require_once 'MWCConfig.php';
 require_once 'MWCExtensions.php';
 require_once 'MWCFunctions.php';

diff --git a/config/Farm/MWCFarm.php b/config/Farm/MWCFarm.php
@@ -0,0 +1,70 @@
+<?php
+
+namespace MediaWikiConfig\Farm;
+
+use MediaWiki\Config\SiteConfiguration;
+use MediaWikiConfig\MediaWikiConfig;
+
+class MWCFarm {
+
+	/**
+	 * @param array<string, string> $wikis
+	 * @param array $settings
+	 * @param string $defaultWiki The wiki that will be used for maintenance scripts by default
+	 */
+	public function __construct(
+		private readonly array $wikis,
+		private array $settings,
+		private readonly string $defaultWiki,
+	) {
+	}
+
+	public function apply( MediaWikiConfig $mwc ): void {
+		$port = $mwc->env( 'MW_DOCKER_PORT' );
+		$serverVals = [];
+		foreach ( $this->wikis as $subdomain => $dbname ) {
+			$serverVals[$dbname] = "http://$subdomain.localhost:$port";
+		}
+		$this->settings['wgServer'] = $serverVals;
+
+		if ( defined( 'MW_DB' ) ) {
+			$wikiId = MW_DB;
+		} elseif ( MW_ENTRY_POINT === 'cli' ) {
+			$wikiId = $this->defaultWiki;
+		} else {
+			$subdomain = explode( '.', $_SERVER['SERVER_NAME'] )[0];
+			if ( !array_key_exists( $subdomain, $this->wikis ) ) {
+				$this->showWikiMap();
+			} else {
+				$wikiId = $this->wikis[$subdomain];
+			}
+		}
+
+		$siteConfiguration = new SiteConfiguration();
+		$siteConfiguration->wikis = array_values( array_unique( $this->wikis ) );
+		$mwc
+			->conf( 'wgLocalDatabases', $siteConfiguration->wikis )
+			->conf( 'wgDBname', $wikiId );
+		$siteConfiguration->suffixes = [ 'wiki' ];
+		$siteConfiguration->settings = $this->settings;
+
+		foreach ( $siteConfiguration->getAll( $wikiId ) as $key => $value ) {
+			$mwc->conf( $key, $value );
+		}
+
+		$mwc->conf( 'wgConf', $siteConfiguration );
+	}
+
+	private function showWikiMap(): never {
+		require_once __DIR__ . '/NotFound.php';
+		die( 1 );
+	}
+
+	/**
+	 * @return array<string, string>
+	 */
+	public function getWikis(): array {
+		return $this->wikis;
+	}
+
+}
diff --git a/config/Farm/NotFound.php b/config/Farm/NotFound.php
@@ -0,0 +1,61 @@
+<?php
+
+use MediaWiki\Html\Html;
+use MediaWikiConfig\Farm\MWCFarm;
+
+global $wgMwcFarm;
+/** @var MWCFarm $wgMwcFarm */
+
+if ( MW_ENTRY_POINT !== 'cli' ) {
+	$wikiLinks = '';
+	// TODO bad
+	$port = getenv( 'MW_DOCKER_PORT' );
+	$path = parse_url( $_SERVER['REQUEST_URI'] ?? '|', PHP_URL_PATH ) ?? '';
+	foreach ( $wgMwcFarm->getWikis() as $subdomain => $dbName ) {
+		$link = Html::element(
+			'a',
+			[
+				// TODO un-hardcode
+				'href' => "http://$subdomain.localhost:$port$path",
+				'class' => 'button',
+			],
+			$dbName,
+		);
+		$wikiLinks .= Html::rawElement( 'li', [], $link );
+	}
+
+	// TODO include simplecss in repo?
+	$output = <<<EOF
+		<!DOCTYPE html>
+		<html lang="en">
+			<head>
+				<meta charset="utf-8" />
+				<meta name="viewport" content="width=device-width, initial-scale=1.0" />
+				<title>Wiki not found</title>
+				<link rel="stylesheet" href="https://cdn.simplecss.org/simple.min.css">
+			</head>
+			<body>
+				<header>
+					<h1>Wiki not found</h1>
+				</header>
+				<main>
+					No wiki was found at the current subdomain.
+					<h2>Available wikis</h2>
+					<ul>$wikiLinks</ul>
+				</main>
+				<footer>
+					<p>
+						Powered by mw-dev-kit
+						(<a href="https://github.com/SomeMWDev/mw-dev-kit" target="_blank">GitHub</a>)
+					</p>
+				</footer>
+			</body>
+		</html>
+	EOF;
+	header( 'Content-length: ' . strlen( $output ) );
+	http_response_code( 404 );
+	echo $output;
+	die( 1 );
+} else {
+	echo "The wiki database '{$this->getConf('wgDBName')}' was not found." . PHP_EOL;
+}
diff --git a/config/MWCConfig.php b/config/MWCConfig.php
@@ -2,6 +2,8 @@
 
 namespace MediaWikiConfig;
 
+use MediaWikiConfig\Farm\MWCFarm;
+
 trait MWCConfig {
 
 	public function allowExternalImages(): self {
@@ -87,4 +89,11 @@ public function setMaxArticleSize( int $amount, int $unit ): self {
 		return $this->conf( 'wgMaxArticleSize', $kibibytes );
 	}
 
+	public function setupFarm( MWCFarm $farm ): self {
+		global $wgMwcFarm;
+		$wgMwcFarm = $farm;
+		$farm->apply( $this );
+		return $this;
+	}
+
 }