Add a PSR-3 logger adapter and make it injectable

lib/composer/composer/autoload_classmap.php

@@ -1071,6 +1071,7 @@
     'OC\\Log\\File' => $baseDir . '/lib/private/Log/File.php',
     'OC\\Log\\LogDetails' => $baseDir . '/lib/private/Log/LogDetails.php',
     'OC\\Log\\LogFactory' => $baseDir . '/lib/private/Log/LogFactory.php',
+    'OC\\Log\\PsrLoggerAdapter' => $baseDir . '/lib/private/Log/PsrLoggerAdapter.php',
     'OC\\Log\\Rotate' => $baseDir . '/lib/private/Log/Rotate.php',
     'OC\\Log\\Syslog' => $baseDir . '/lib/private/Log/Syslog.php',
     'OC\\Log\\Systemdlog' => $baseDir . '/lib/private/Log/Systemdlog.php',

lib/composer/composer/autoload_static.php

@@ -1100,6 +1100,7 @@ class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
         'OC\\Log\\File' => __DIR__ . '/../../..' . '/lib/private/Log/File.php',
         'OC\\Log\\LogDetails' => __DIR__ . '/../../..' . '/lib/private/Log/LogDetails.php',
         'OC\\Log\\LogFactory' => __DIR__ . '/../../..' . '/lib/private/Log/LogFactory.php',
+        'OC\\Log\\PsrLoggerAdapter' => __DIR__ . '/../../..' . '/lib/private/Log/PsrLoggerAdapter.php',
         'OC\\Log\\Rotate' => __DIR__ . '/../../..' . '/lib/private/Log/Rotate.php',
         'OC\\Log\\Syslog' => __DIR__ . '/../../..' . '/lib/private/Log/Syslog.php',
         'OC\\Log\\Systemdlog' => __DIR__ . '/../../..' . '/lib/private/Log/Systemdlog.php',

lib/private/Log/PsrLoggerAdapter.php

@@ -0,0 +1,166 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright 2020 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2020 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace OC\Log;
+
+use OCP\ILogger;
+use Psr\Log\InvalidArgumentException;
+use Psr\Log\LoggerInterface;
+
+final class PsrLoggerAdapter implements LoggerInterface {
+
+	/** @var ILogger */
+	private $logger;
+
+	public function __construct(ILogger $logger) {
+		$this->logger = $logger;
+	}
+
+	/**
+	 * System is unusable.
+	 *
+	 * @param string $message
+	 * @param array $context
+	 *
+	 * @return void
+	 */
+	public function emergency($message, array $context = []): void {
+		$this->logger->emergency($message, $context);
+	}
+
+	/**
+	 * Action must be taken immediately.
+	 *
+	 * Example: Entire website down, database unavailable, etc. This should
+	 * trigger the SMS alerts and wake you up.
+	 *
+	 * @param string $message
+	 * @param array $context
+	 *
+	 * @return void
+	 */
+	public function alert($message, array $context = []) {
+		$this->logger->alert($message, $context);
+	}
+
+	/**
+	 * Critical conditions.
+	 *
+	 * Example: Application component unavailable, unexpected exception.
+	 *
+	 * @param string $message
+	 * @param array $context
+	 *
+	 * @return void
+	 */
+	public function critical($message, array $context = []) {
+		$this->logger->critical($message, $context);
+	}
+
+	/**
+	 * Runtime errors that do not require immediate action but should typically
+	 * be logged and monitored.
+	 *
+	 * @param string $message
+	 * @param array $context
+	 *
+	 * @return void
+	 */
+	public function error($message, array $context = []) {
+		$this->logger->error($message, $context);
+	}
+
+	/**
+	 * Exceptional occurrences that are not errors.
+	 *
+	 * Example: Use of deprecated APIs, poor use of an API, undesirable things
+	 * that are not necessarily wrong.
+	 *
+	 * @param string $message
+	 * @param array $context
+	 *
+	 * @return void
+	 */
+	public function warning($message, array $context = []) {
+		$this->logger->warning($message, $context);
+	}
+
+	/**
+	 * Normal but significant events.
+	 *
+	 * @param string $message
+	 * @param array $context
+	 *
+	 * @return void
+	 */
+	public function notice($message, array $context = []) {
+		$this->logger->notice($message, $context);
+	}
+
+	/**
+	 * Interesting events.
+	 *
+	 * Example: User logs in, SQL logs.
+	 *
+	 * @param string $message
+	 * @param array $context
+	 *
+	 * @return void
+	 */
+	public function info($message, array $context = []) {
+		$this->logger->info($message, $context);
+	}
+
+	/**
+	 * Detailed debug information.
+	 *
+	 * @param string $message
+	 * @param array $context
+	 *
+	 * @return void
+	 */
+	public function debug($message, array $context = []) {
+		$this->logger->debug($message, $context);
+	}
+
+	/**
+	 * Logs with an arbitrary level.
+	 *
+	 * @param mixed $level
+	 * @param string $message
+	 * @param array $context
+	 *
+	 * @return void
+	 *
+	 * @throws InvalidArgumentException
+	 */
+	public function log($level, $message, array $context = []) {
+		if (!is_int($level) || $level < ILogger::DEBUG || $level > ILogger::FATAL) {
+			throw new InvalidArgumentException('Nextcloud allows only integer log levels');
+		}
+		$this->logger->log($level, $message, $context);
+	}
+
+}

lib/private/Server.php

@@ -101,6 +101,7 @@
 use OC\Lock\NoopLockingProvider;
 use OC\Lockdown\LockdownManager;
 use OC\Log\LogFactory;
+use OC\Log\PsrLoggerAdapter;
 use OC\Mail\Mailer;
 use OC\Memcache\ArrayCache;
 use OC\Memcache\Factory;
@@ -222,6 +223,7 @@
 use OCP\User\Events\UserLoggedInEvent;
 use OCP\User\Events\UserLoggedInWithCookieEvent;
 use OCP\User\Events\UserLoggedOutEvent;
+use Psr\Log\LoggerInterface;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\EventDispatcher\GenericEvent;
 use OCA\Files_External\Service\UserStoragesService;
@@ -720,6 +722,8 @@ public function __construct($webRoot, \OC\Config $config) {
 		});
 		$this->registerAlias(ILogger::class, \OC\Log::class);
 		$this->registerDeprecatedAlias('Logger', \OC\Log::class);
+		// PSR-3 logger
+		$this->registerAlias(LoggerInterface::class, PsrLoggerAdapter::class);
 
 		$this->registerService(ILogFactory::class, function (Server $c) {
 			return new LogFactory($c, $this->getSystemConfig());