1 files changed, 250 insertions, 0 deletions
diff --git a/lib/private/AppFramework/Utility/SimpleContainer.php b/lib/private/AppFramework/Utility/SimpleContainer.php
new file mode 100644
index 00000000000..0db3bfc1c77
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+++ b/lib/private/AppFramework/Utility/SimpleContainer.php
@@ -0,0 +1,250 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+namespace OC\AppFramework\Utility;
+
+use ArrayAccess;
+use Closure;
+use OCP\AppFramework\QueryException;
+use OCP\IContainer;
+use Pimple\Container;
+use Psr\Container\ContainerExceptionInterface;
+use Psr\Container\ContainerInterface;
+use Psr\Log\LoggerInterface;
+use ReflectionClass;
+use ReflectionException;
+use ReflectionNamedType;
+use ReflectionParameter;
+use function class_exists;
+
+/**
+ * SimpleContainer is a simple implementation of a container on basis of Pimple
+ */
+class SimpleContainer implements ArrayAccess, ContainerInterface, IContainer {
+	public static bool $useLazyObjects = false;
+
+	private Container $container;
+
+	public function __construct() {
+		$this->container = new Container();
+	}
+
+	/**
+	 * @template T
+	 * @param class-string<T>|string $id
+	 * @return T|mixed
+	 * @psalm-template S as class-string<T>|string
+	 * @psalm-param S $id
+	 * @psalm-return (S is class-string<T> ? T : mixed)
+	 */
+	public function get(string $id): mixed {
+		return $this->query($id);
+	}
+
+	public function has(string $id): bool {
+		// If a service is no registered but is an existing class, we can probably load it
+		return isset($this->container[$id]) || class_exists($id);
+	}
+
+	/**
+	 * @param ReflectionClass $class the class to instantiate
+	 * @return object the created class
+	 * @suppress PhanUndeclaredClassInstanceof
+	 */
+	private function buildClass(ReflectionClass $class): object {
+		$constructor = $class->getConstructor();
+		if ($constructor === null) {
+			/* No constructor, return a instance directly */
+			return $class->newInstance();
+		}
+		if (PHP_VERSION_ID >= 80400 && self::$useLazyObjects) {
+			/* For PHP>=8.4, use a lazy ghost to delay constructor and dependency resolving */
+			/** @psalm-suppress UndefinedMethod */
+			return $class->newLazyGhost(function (object $object) use ($constructor): void {
+				/** @psalm-suppress DirectConstructorCall For lazy ghosts we have to call the constructor directly */
+				$object->__construct(...$this->buildClassConstructorParameters($constructor));
+			});
+		} else {
+			return $class->newInstanceArgs($this->buildClassConstructorParameters($constructor));
+		}
+	}
+
+	private function buildClassConstructorParameters(\ReflectionMethod $constructor): array {
+		return array_map(function (ReflectionParameter $parameter) {
+			$parameterType = $parameter->getType();
+
+			$resolveName = $parameter->getName();
+
+			// try to find out if it is a class or a simple parameter
+			if ($parameterType !== null && ($parameterType instanceof ReflectionNamedType) && !$parameterType->isBuiltin()) {
+				$resolveName = $parameterType->getName();
+			}
+
+			try {
+				$builtIn = $parameterType !== null && ($parameterType instanceof ReflectionNamedType)
+							&& $parameterType->isBuiltin();
+				return $this->query($resolveName, !$builtIn);
+			} catch (ContainerExceptionInterface $e) {
+				// Service not found, use the default value when available
+				if ($parameter->isDefaultValueAvailable()) {
+					return $parameter->getDefaultValue();
+				}
+
+				if ($parameterType !== null && ($parameterType instanceof ReflectionNamedType) && !$parameterType->isBuiltin()) {
+					$resolveName = $parameter->getName();
+					try {
+						return $this->query($resolveName);
+					} catch (ContainerExceptionInterface $e2) {
+						// Pass null if typed and nullable
+						if ($parameter->allowsNull() && ($parameterType instanceof ReflectionNamedType)) {
+							return null;
+						}
+
+						// don't lose the error we got while trying to query by type
+						throw new QueryException($e->getMessage(), (int)$e->getCode(), $e);
+					}
+				}
+
+				throw $e;
+			}
+		}, $constructor->getParameters());
+	}
+
+	public function resolve($name) {
+		$baseMsg = 'Could not resolve ' . $name . '!';
+		try {
+			$class = new ReflectionClass($name);
+			if ($class->isInstantiable()) {
+				return $this->buildClass($class);
+			} else {
+				throw new QueryException($baseMsg
+					. ' Class can not be instantiated');
+			}
+		} catch (ReflectionException $e) {
+			// Class does not exist
+			throw new QueryNotFoundException($baseMsg . ' ' . $e->getMessage());
+		}
+	}
+
+	public function query(string $name, bool $autoload = true) {
+		$name = $this->sanitizeName($name);
+		if (isset($this->container[$name])) {
+			return $this->container[$name];
+		}
+
+		if ($autoload) {
+			$object = $this->resolve($name);
+			$this->registerService($name, function () use ($object) {
+				return $object;
+			});
+			return $object;
+		}
+
+		throw new QueryNotFoundException('Could not resolve ' . $name . '!');
+	}
+
+	/**
+	 * @param string $name
+	 * @param mixed $value
+	 */
+	public function registerParameter($name, $value) {
+		$this[$name] = $value;
+	}
+
+	/**
+	 * The given closure is call the first time the given service is queried.
+	 * The closure has to return the instance for the given service.
+	 * Created instance will be cached in case $shared is true.
+	 *
+	 * @param string $name name of the service to register another backend for
+	 * @param Closure $closure the closure to be called on service creation
+	 * @param bool $shared
+	 */
+	public function registerService($name, Closure $closure, $shared = true) {
+		$wrapped = function () use ($closure) {
+			return $closure($this);
+		};
+		$name = $this->sanitizeName($name);
+		if (isset($this->container[$name])) {
+			unset($this->container[$name]);
+		}
+		if ($shared) {
+			$this->container[$name] = $wrapped;
+		} else {
+			$this->container[$name] = $this->container->factory($wrapped);
+		}
+	}
+
+	/**
+	 * Shortcut for returning a service from a service under a different key,
+	 * e.g. to tell the container to return a class when queried for an
+	 * interface
+	 * @param string $alias the alias that should be registered
+	 * @param string $target the target that should be resolved instead
+	 */
+	public function registerAlias($alias, $target): void {
+		$this->registerService($alias, function (ContainerInterface $container) use ($target): mixed {
+			return $container->get($target);
+		}, false);
+	}
+
+	protected function registerDeprecatedAlias(string $alias, string $target): void {
+		$this->registerService($alias, function (ContainerInterface $container) use ($target, $alias): mixed {
+			try {
+				$logger = $container->get(LoggerInterface::class);
+				$logger->debug('The requested alias "' . $alias . '" is deprecated. Please request "' . $target . '" directly. This alias will be removed in a future Nextcloud version.', [
+					'app' => $this->appName ?? 'serverDI',
+				]);
+			} catch (ContainerExceptionInterface $e) {
+				// Could not get logger. Continue
+			}
+
+			return $container->get($target);
+		}, false);
+	}
+
+	/**
+	 * @param string $name
+	 * @return string
+	 */
+	protected function sanitizeName($name) {
+		if (isset($name[0]) && $name[0] === '\\') {
+			return ltrim($name, '\\');
+		}
+		return $name;
+	}
+
+	/**
+	 * @deprecated 20.0.0 use \Psr\Container\ContainerInterface::has
+	 */
+	public function offsetExists($id): bool {
+		return $this->container->offsetExists($id);
+	}
+
+	/**
+	 * @deprecated 20.0.0 use \Psr\Container\ContainerInterface::get
+	 * @return mixed
+	 */
+	#[\ReturnTypeWillChange]
+	public function offsetGet($id) {
+		return $this->container->offsetGet($id);
+	}
+
+	/**
+	 * @deprecated 20.0.0 use \OCP\IContainer::registerService
+	 */
+	public function offsetSet($offset, $value): void {
+		$this->container->offsetSet($offset, $value);
+	}
+
+	/**
+	 * @deprecated 20.0.0
+	 */
+	public function offsetUnset($offset): void {
+		$this->container->offsetUnset($offset);
+	}
+}