first version

kirby/vendor/getkirby/composer-installer/src/Installer.php

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+<?php
+
+namespace Kirby\ComposerInstaller;
+
+use InvalidArgumentException;
+use Composer\Config;
+use Composer\Installer\LibraryInstaller;
+use Composer\Package\PackageInterface;
+
+/**
+ * @package   Kirby Composer Installer
+ * @author    Lukas Bestle <lukas@getkirby.com>
+ * @link      https://getkirby.com
+ * @copyright Bastian Allgeier
+ * @license   MIT
+ */
+class Installer extends LibraryInstaller
+{
+    /**
+     * Decides if the installer supports the given type
+     *
+     * @param  string $packageType
+     * @return bool
+     */
+    public function supports($packageType): bool
+    {
+        return $packageType === 'kirby-cms';
+    }
+
+    /**
+     * Returns the installation path of a package
+     *
+     * @param  PackageInterface $package
+     * @return string           path
+     */
+    public function getInstallPath(PackageInterface $package): string
+    {
+        // get the extra configuration of the top-level package
+        if ($rootPackage = $this->composer->getPackage()) {
+            $extra = $rootPackage->getExtra();
+        } else {
+            $extra = [];
+        }
+
+        // use path from configuration, otherwise fall back to default
+        $path = $extra['kirby-cms-path'] ?? 'kirby';
+
+        // don't allow unsafe directories
+        $vendorDir = $this->composer->getConfig()->get('vendor-dir', Config::RELATIVE_PATHS) ?? 'vendor';
+        if ($path === $vendorDir || $path === '.') {
+            throw new InvalidArgumentException('The path ' . $path . ' is an unsafe installation directory for ' . $package->getPrettyName() . '.');
+        }
+
+        return $path;
+    }
+}

kirby/vendor/getkirby/composer-installer/src/Plugin.php

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+<?php
+
+namespace Kirby\ComposerInstaller;
+
+use Composer\Composer;
+use Composer\IO\IOInterface;
+use Composer\Plugin\PluginInterface;
+
+/**
+ * @package   Kirby Composer Installer
+ * @author    Lukas Bestle <lukas@getkirby.com>
+ * @link      https://getkirby.com
+ * @copyright Bastian Allgeier
+ * @license   MIT
+ */
+class Plugin implements PluginInterface
+{
+    /**
+     * Apply plugin modifications to Composer
+     *
+     * @param Composer    $composer
+     * @param IOInterface $io
+     */
+    public function activate(Composer $composer, IOInterface $io)
+    {
+        $installer = new Installer($io, $composer);
+        $composer->getInstallationManager()->addInstaller($installer);
+    }
+}