15 files changed, 598 insertions, 68 deletions
diff --git a/phpBB/phpbb/avatar/driver/local.php b/phpBB/phpbb/avatar/driver/local.php
index 00e519e3f2..f3acf7cb2c 100644
--- a/phpBB/phpbb/avatar/driver/local.php
+++ b/phpBB/phpbb/avatar/driver/local.php
@@ -36,7 +36,7 @@ class local extends \phpbb\avatar\driver\driver
 	public function prepare_form($request, $template, $user, $row, &$error)
 	{
 		$avatar_list = $this->get_avatar_list($user);
-		$category = $request->variable('avatar_local_cat', '');
+		$category = $request->variable('avatar_local_cat', key($avatar_list));
 
 		foreach ($avatar_list as $cat => $null)
 		{
@@ -131,7 +131,7 @@ class local extends \phpbb\avatar\driver\driver
 		}
 
 		return array(
-			'avatar' => ($category != $user->lang['MAIN']) ? $category . '/' . $file : $file,
+			'avatar' => ($category != $user->lang['NO_AVATAR_CATEGORY']) ? $category . '/' . $file : $file,
 			'avatar_width' => $avatar_list[$category][urldecode($file)]['width'],
 			'avatar_height' => $avatar_list[$category][urldecode($file)]['height'],
 		);
@@ -179,9 +179,9 @@ class local extends \phpbb\avatar\driver\driver
 					{
 						$dims = array(0, 0);
 					}
-					$cat = ($path == $file_path) ? $user->lang['MAIN'] : str_replace("$path/", '', $file_path);
+					$cat = ($path == $file_path) ? $user->lang['NO_AVATAR_CATEGORY'] : str_replace("$path/", '', $file_path);
 					$avatar_list[$cat][$image] = array(
-						'file'      => ($cat != $user->lang['MAIN']) ? rawurlencode($cat) . '/' . rawurlencode($image) : rawurlencode($image),
+						'file'      => ($cat != $user->lang['NO_AVATAR_CATEGORY']) ? rawurlencode($cat) . '/' . rawurlencode($image) : rawurlencode($image),
 						'filename'  => rawurlencode($image),
 						'name'      => ucfirst(str_replace('_', ' ', preg_replace('#^(.*)\..*$#', '\1', $image))),
 						'width'     => $dims[0],
diff --git a/phpBB/phpbb/console/application.php b/phpBB/phpbb/console/application.php
index da2bfbb49a..b1f0635913 100644
--- a/phpBB/phpbb/console/application.php
+++ b/phpBB/phpbb/console/application.php
@@ -13,15 +13,93 @@
 
 namespace phpbb\console;
 
+use Symfony\Component\Console\Shell;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\DependencyInjection\TaggedContainerInterface;
 
 class application extends \Symfony\Component\Console\Application
 {
-	function register_container_commands(TaggedContainerInterface $container, $tag = 'console.command')
+	/**
+	* @var bool Indicates whether or not we are in a shell
+	*/
+	protected $in_shell = false;
+
+	/**
+	* @var \phpbb\user User object
+	*/
+	protected $user;
+
+	/**
+	* @param string			$name		The name of the application
+	* @param string			$version	The version of the application
+	* @param \phpbb\user	$user		The user which runs the application (used for translation)
+	*/
+	public function __construct($name, $version, \phpbb\user $user)
+	{
+		parent::__construct($name, $version);
+
+		$this->user = $user;
+	}
+
+	/**
+	* Gets the help message.
+	*
+	* It's a hack of the default help message to display the --shell
+	* option only for the application and not for all the commands.
+	*
+	* @return string A help message.
+	*/
+	public function getHelp()
+	{
+		// If we are already in a shell
+		// we do not want to have the --shell option available
+		if ($this->in_shell)
+		{
+			return parent::getHelp();
+		}
+
+		$this->getDefinition()->addOption(new InputOption(
+			'--shell',
+			'-s',
+			InputOption::VALUE_NONE,
+			$this->user->lang('CLI_DESCRIPTION_OPTION_SHELL')
+		));
+
+		return parent::getHelp();
+	}
+
+	/**
+	* Register a set of commands from the container
+	*
+	* @param TaggedContainerInterface	$container	The container
+	* @param string						$tag		The tag used to register the commands
+	*/
+	public function register_container_commands(TaggedContainerInterface $container, $tag = 'console.command')
 	{
 		foreach($container->findTaggedServiceIds($tag) as $id => $void)
 		{
 			$this->add($container->get($id));
 		}
 	}
+
+	/**
+	* {@inheritdoc}
+	*/
+	public function doRun(InputInterface $input, OutputInterface $output)
+	{
+		// Run a shell if the --shell (or -s) option is set and if no command name is specified
+		// Also, we do not want to have the --shell option available if we are already in a shell
+		if (!$this->in_shell && $this->getCommandName($input) === null && $input->hasParameterOption(array('--shell', '-s')))
+		{
+			$shell = new Shell($this);
+			$this->in_shell = true;
+			$shell->run();
+
+			return 0;
+		}
+
+		return parent::doRun($input, $output);
+	}
 }
diff --git a/phpBB/phpbb/console/command/cache/purge.php b/phpBB/phpbb/console/command/cache/purge.php
index 1e2adaeb4d..50953185a4 100644
--- a/phpBB/phpbb/console/command/cache/purge.php
+++ b/phpBB/phpbb/console/command/cache/purge.php
@@ -43,7 +43,6 @@ class purge extends \phpbb\console\command\command
 		$this->log = $log;
 		$this->user = $user;
 		$this->config = $config;
-		$this->user->add_lang(array('acp/common'));
 		parent::__construct();
 	}
 
diff --git a/phpBB/phpbb/console/command/cron/cron_list.php b/phpBB/phpbb/console/command/cron/cron_list.php
new file mode 100644
index 0000000000..9db6a23947
--- /dev/null
+++ b/phpBB/phpbb/console/command/cron/cron_list.php
@@ -0,0 +1,90 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+namespace phpbb\console\command\cron;
+
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class cron_list extends \phpbb\console\command\command
+{
+	/** @var \phpbb\cron\manager */
+	protected $cron_manager;
+
+	/** @var \phpbb\user */
+	protected $user;
+
+	public function __construct(\phpbb\cron\manager $cron_manager, \phpbb\user $user)
+	{
+		$this->cron_manager = $cron_manager;
+		$this->user = $user;
+		parent::__construct();
+	}
+
+	protected function configure()
+	{
+		$this
+			->setName('cron:list')
+			->setDescription($this->user->lang('CLI_DESCRIPTION_CRON_LIST'))
+		;
+	}
+
+	protected function execute(InputInterface $input, OutputInterface $output)
+	{
+		$tasks = $this->cron_manager->get_tasks();
+
+		if (empty($tasks))
+		{
+			$output->writeln($this->user->lang('CRON_NO_TASKS'));
+			return;
+		}
+
+		$ready_tasks = array();
+		$not_ready_tasks = array();
+		foreach ($tasks as $task)
+		{
+			if ($task->is_ready())
+			{
+				$ready_tasks[] = $task;
+			}
+			else
+			{
+				$not_ready_tasks[] = $task;
+			}
+		}
+
+		if (!empty($ready_tasks))
+		{
+			$output->writeln('<info>' . $this->user->lang('TASKS_READY') . '</info>');
+			$this->print_tasks_names($ready_tasks, $output);
+		}
+
+		if (!empty($ready_tasks) && !empty($not_ready_tasks))
+		{
+			$output->writeln('');
+		}
+
+		if (!empty($not_ready_tasks))
+		{
+			$output->writeln('<info>' . $this->user->lang('TASKS_NOT_READY') . '</info>');
+			$this->print_tasks_names($not_ready_tasks, $output);
+		}
+	}
+
+	protected function print_tasks_names(array $tasks, OutputInterface $output)
+	{
+		foreach ($tasks as $task)
+		{
+			$output->writeln($task->get_name());
+		}
+	}
+}
diff --git a/phpBB/phpbb/console/command/cron/run.php b/phpBB/phpbb/console/command/cron/run.php
new file mode 100644
index 0000000000..1029a2e085
--- /dev/null
+++ b/phpBB/phpbb/console/command/cron/run.php
@@ -0,0 +1,176 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\console\command\cron;
+
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class run extends \phpbb\console\command\command
+{
+	/** @var \phpbb\cron\manager */
+	protected $cron_manager;
+
+	/** @var \phpbb\lock\db */
+	protected $lock_db;
+
+	/** @var \phpbb\user */
+	protected $user;
+
+	/**
+	* Construct method
+	*
+	* @param \phpbb\cron\manager $cron_manager The cron manager containing
+	*		the cron tasks to be executed.
+	* @param \phpbb\lock\db $lock_db The lock for accessing database.
+	* @param \phobb\user $user The user object (used to get language information)
+	*/
+	public function __construct(\phpbb\cron\manager $cron_manager, \phpbb\lock\db $lock_db, \phpbb\user $user)
+	{
+		$this->cron_manager = $cron_manager;
+		$this->lock_db = $lock_db;
+		$this->user = $user;
+		parent::__construct();
+	}
+
+	/**
+	* Sets the command name and description
+	*
+	* @return null
+	*/
+	protected function configure()
+	{
+		$this
+			->setName('cron:run')
+			->setDescription($this->user->lang('CLI_DESCRIPTION_CRON_RUN'))
+			->addArgument('name', InputArgument::OPTIONAL, $this->user->lang('CLI_DESCRIPTION_CRON_RUN_ARGUMENT_1'))
+		;
+	}
+
+	/**
+	* Executes the command cron:run.
+	*
+	* Tries to acquire the cron lock, then if no argument has been given runs all ready cron tasks.
+	* If the cron lock can not be obtained, an error message is printed
+	*		and the exit status is set to 1.
+	* If the verbose option is specified, each start of a task is printed.
+	*		Otherwise there is no output.
+	* If an argument is given to the command, only the task whose name matches the
+	*		argument will be started. If verbose option is specified,
+	*		an info message containing the name of the task is printed.
+	* If no task matches the argument given, an error message is printed
+	*		and the exit status is set to 2.
+	*
+	* @param InputInterface $input The input stream used to get the argument and verboe option.
+	* @param OutputInterface $output The output stream, used for printing verbose-mode and error information.
+	*
+	* @return int 0 if all is ok, 1 if a lock error occured and 2 if no task matching the argument was found.
+	*/
+	protected function execute(InputInterface $input, OutputInterface $output)
+	{
+		if ($this->lock_db->acquire())
+		{
+			$task_name = $input->getArgument('name');
+			if ($task_name)
+			{
+				$exit_status = $this->run_one($input, $output, $task_name);
+			}
+			else
+			{
+				$exit_status = $this->run_all($input, $output);
+			}
+
+			$this->lock_db->release();
+			return $exit_status;
+		}
+		else
+		{
+			$output->writeln('<error>' . $this->user->lang('CRON_LOCK_ERROR') . '</error>');
+			return 1;
+		}
+	}
+
+	/*
+	* Executes all ready cron tasks.
+	*
+	* If verbose mode is set, an info message will be printed if there is no task to
+	*		be run, or else for each starting task.
+	*
+	* @see execute
+	* @param InputInterface $input The input stream used to get the argument and verbose option.
+	* @param OutputInterface $output The output stream, used for printing verbose-mode and error information.
+	* @return int 0
+	*/
+	protected function run_all(InputInterface $input, OutputInterface $output)
+	{
+		$run_tasks = $this->cron_manager->find_all_ready_tasks();
+
+		if ($run_tasks)
+		{
+			foreach ($run_tasks as $task)
+			{
+				if ($input->getOption('verbose'))
+				{
+					$output->writeln('<info>' . $this->user->lang('RUNNING_TASK', $task->get_name()) . '</info>');
+				}
+
+				$task->run();
+			}
+		}
+		else
+		{
+			if ($input->getOption('verbose'))
+			{
+				$output->writeln('<info>' . $this->user->lang('CRON_NO_TASK') . '</info>');
+			}
+		}
+
+		return 0;
+	}
+
+	/*
+	* Executes a given cron task, if it is ready.
+	*
+	* If there is a task whose name matches $task_name, it is run and 0 is returned.
+	*		and if verbose mode is set, print an info message with the name of the task.
+	* If there is no task matching $task_name, the function prints an error message
+	*		and returns with status 2.
+	*
+	* @see execute
+	* @param string $task_name The name of the task that should be run.
+	* @param InputInterface $input The input stream used to get the argument and verbose option.
+	* @param OutputInterface $output The output stream, used for printing verbose-mode and error information.
+	* @return int 0 if all is well, 2 if no task matches $task_name.
+	*/
+	protected function run_one(InputInterface $input, OutputInterface $output, $task_name)
+	{
+		$task = $this->cron_manager->find_task($task_name);
+		if ($task)
+		{
+			if ($input->getOption('verbose'))
+			{
+				$output->writeln('<info>' . $this->user->lang('RUNNING_TASK', $task_name) . '</info>');
+			}
+
+			$task->run();
+			return 0;
+		}
+		else
+		{
+			$output->writeln('<error>' . $this->user->lang('CRON_NO_SUCH_TASK', $task_name) . '</error>');
+			return 2;
+		}
+	}
+}
diff --git a/phpBB/phpbb/console/command/db/migrate.php b/phpBB/phpbb/console/command/db/migrate.php
index 0f74664095..2abeaf5268 100644
--- a/phpBB/phpbb/console/command/db/migrate.php
+++ b/phpBB/phpbb/console/command/db/migrate.php
@@ -43,7 +43,7 @@ class migrate extends \phpbb\console\command\command
 		$this->cache = $cache;
 		$this->log = $log;
 		$this->user = $user;
-		$this->user->add_lang(array('common', 'acp/common', 'install', 'migrator'));
+		$this->user->add_lang(array('common', 'install', 'migrator'));
 		parent::__construct();
 	}
 
diff --git a/phpBB/phpbb/cron/manager.php b/phpBB/phpbb/cron/manager.php
index 1eb8edf033..f04f063228 100644
--- a/phpBB/phpbb/cron/manager.php
+++ b/phpBB/phpbb/cron/manager.php
@@ -122,6 +122,16 @@ class manager
 	}
 
 	/**
+	* Find all tasks and return them.
+	*
+	* @return array List of all tasks.
+	*/
+	public function get_tasks()
+	{
+		return $this->tasks;
+	}
+
+	/**
 	* Wraps a task inside an instance of \phpbb\cron\task\wrapper.
 	*
 	* @param  \phpbb\cron\task\task 			$task The task.
diff --git a/phpBB/phpbb/db/migration/data/v310/beta4.php b/phpBB/phpbb/db/migration/data/v310/beta4.php
new file mode 100644
index 0000000000..3e91d95178
--- /dev/null
+++ b/phpBB/phpbb/db/migration/data/v310/beta4.php
@@ -0,0 +1,33 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\db\migration\data\v310;
+
+class beta4 extends \phpbb\db\migration\migration
+{
+	static public function depends_on()
+	{
+		return array(
+			'\phpbb\db\migration\data\v310\beta3',
+			'\phpbb\db\migration\data\v310\extensions_version_check_force_unstable',
+			'\phpbb\db\migration\data\v310\reset_missing_captcha_plugin',
+		);
+	}
+
+	public function update_data()
+	{
+		return array(
+			array('config.update', array('version', '3.1.0-b4')),
+		);
+	}
+}
diff --git a/phpBB/phpbb/db/migration/data/v310/extensions_version_check_force_unstable.php b/phpBB/phpbb/db/migration/data/v310/extensions_version_check_force_unstable.php
index 5941c3aa54..1d6276f484 100644
--- a/phpBB/phpbb/db/migration/data/v310/extensions_version_check_force_unstable.php
+++ b/phpBB/phpbb/db/migration/data/v310/extensions_version_check_force_unstable.php
@@ -1,9 +1,13 @@
 <?php
 /**
 *
-* @package migration
-* @copyright (c) 2012 phpBB Group
-* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
 *
 */
 
diff --git a/phpBB/phpbb/extension/finder.php b/phpBB/phpbb/extension/finder.php
index 71a5542b67..6f2408094e 100644
--- a/phpBB/phpbb/extension/finder.php
+++ b/phpBB/phpbb/extension/finder.php
@@ -465,6 +465,10 @@ class finder
 			}
 			else if ($directory && $directory[0] === '/')
 			{
+				if (!$is_dir)
+				{
+					$path .= substr($directory, 1);
+				}
 				$directory_pattern = '^' . preg_quote(str_replace('/', DIRECTORY_SEPARATOR, $directory) . DIRECTORY_SEPARATOR, '#');
 			}
 			else
@@ -477,45 +481,56 @@ class finder
 			}
 			$directory_pattern = '#' . $directory_pattern . '#';
 
-			$iterator = new \RecursiveIteratorIterator(
-				new \phpbb\recursive_dot_prefix_filter_iterator(
-					new \RecursiveDirectoryIterator(
-						$path,
-						\FilesystemIterator::SKIP_DOTS
-					)
-				),
-				\RecursiveIteratorIterator::SELF_FIRST
-			);
-
-			foreach ($iterator as $file_info)
+			if (is_dir($path))
 			{
-				$filename = $file_info->getFilename();
-
-				if ($file_info->isDir() == $is_dir)
+				$iterator = new \RecursiveIteratorIterator(
+					new \phpbb\recursive_dot_prefix_filter_iterator(
+						new \RecursiveDirectoryIterator(
+							$path,
+							\FilesystemIterator::SKIP_DOTS
+						)
+					),
+					\RecursiveIteratorIterator::SELF_FIRST
+				);
+
+				foreach ($iterator as $file_info)
 				{
-					if ($is_dir)
+					$filename = $file_info->getFilename();
+
+					if ($file_info->isDir() == $is_dir)
 					{
-						$relative_path = $iterator->getInnerIterator()->getSubPath() . DIRECTORY_SEPARATOR . basename($filename) . DIRECTORY_SEPARATOR;
-						if ($relative_path[0] !== DIRECTORY_SEPARATOR)
+						if ($is_dir)
 						{
-							$relative_path = DIRECTORY_SEPARATOR . $relative_path;
+							$relative_path = $iterator->getInnerIterator()->getSubPath() . DIRECTORY_SEPARATOR . basename($filename) . DIRECTORY_SEPARATOR;
+							if ($relative_path[0] !== DIRECTORY_SEPARATOR)
+							{
+								$relative_path = DIRECTORY_SEPARATOR . $relative_path;
+							}
+						}
+						else
+						{
+							$relative_path = $iterator->getInnerIterator()->getSubPathname();
+							if ($directory && $directory[0] === '/')
+							{
+								$relative_path = str_replace('/', DIRECTORY_SEPARATOR, $directory) . DIRECTORY_SEPARATOR . $relative_path;
+							}
+							else
+							{
+								$relative_path = DIRECTORY_SEPARATOR . $relative_path;
+							}
 						}
-					}
-					else
-					{
-						$relative_path = DIRECTORY_SEPARATOR . $iterator->getInnerIterator()->getSubPathname();
-					}
 
-					if ((!$suffix || substr($relative_path, -strlen($suffix)) === $suffix) &&
-						(!$prefix || substr($filename, 0, strlen($prefix)) === $prefix) &&
-						(!$directory || preg_match($directory_pattern, $relative_path)))
-					{
-						$files[] = array(
-							'named_path'	=> str_replace(DIRECTORY_SEPARATOR, '/', $location . $name . substr($relative_path, 1)),
-							'ext_name'		=> $ext_name,
-							'path'			=> str_replace(array(DIRECTORY_SEPARATOR, $this->phpbb_root_path), array('/', ''), $file_info->getPath()) . '/',
-							'filename'		=> $filename,
-						);
+						if ((!$suffix || substr($relative_path, -strlen($suffix)) === $suffix) &&
+							(!$prefix || substr($filename, 0, strlen($prefix)) === $prefix) &&
+							(!$directory || preg_match($directory_pattern, $relative_path)))
+						{
+							$files[] = array(
+								'named_path'	=> str_replace(DIRECTORY_SEPARATOR, '/', $location . $name . substr($relative_path, 1)),
+								'ext_name'		=> $ext_name,
+								'path'			=> str_replace(array(DIRECTORY_SEPARATOR, $this->phpbb_root_path), array('/', ''), $file_info->getPath()) . '/',
+								'filename'		=> $filename,
+							);
+						}
 					}
 				}
 			}
diff --git a/phpBB/phpbb/extension/manager.php b/phpBB/phpbb/extension/manager.php
index 0bfec23573..cd7289e085 100644
--- a/phpBB/phpbb/extension/manager.php
+++ b/phpBB/phpbb/extension/manager.php
@@ -26,6 +26,7 @@ class manager
 	protected $db;
 	protected $config;
 	protected $cache;
+	protected $user;
 	protected $php_ext;
 	protected $extensions;
 	protected $extension_table;
@@ -37,25 +38,27 @@ class manager
 	*
 	* @param ContainerInterface $container A container
 	* @param \phpbb\db\driver\driver_interface $db A database connection
-	* @param \phpbb\config\config $config \phpbb\config\config
+	* @param \phpbb\config\config $config Config object
 	* @param \phpbb\filesystem $filesystem
+	* @param \phpbb\user $user User object
 	* @param string $extension_table The name of the table holding extensions
 	* @param string $phpbb_root_path Path to the phpbb includes directory.
-	* @param string $php_ext php file extension
+	* @param string $php_ext php file extension, defaults to php
 	* @param \phpbb\cache\driver\driver_interface $cache A cache instance or null
 	* @param string $cache_name The name of the cache variable, defaults to _ext
 	*/
-	public function __construct(ContainerInterface $container, \phpbb\db\driver\driver_interface $db, \phpbb\config\config $config, \phpbb\filesystem $filesystem, $extension_table, $phpbb_root_path, $php_ext = 'php', \phpbb\cache\driver\driver_interface $cache = null, $cache_name = '_ext')
+	public function __construct(ContainerInterface $container, \phpbb\db\driver\driver_interface $db, \phpbb\config\config $config, \phpbb\filesystem $filesystem, \phpbb\user $user, $extension_table, $phpbb_root_path, $php_ext = 'php', \phpbb\cache\driver\driver_interface $cache = null, $cache_name = '_ext')
 	{
+		$this->cache = $cache;
+		$this->cache_name = $cache_name;
+		$this->config = $config;
 		$this->container = $container;
-		$this->phpbb_root_path = $phpbb_root_path;
 		$this->db = $db;
-		$this->config = $config;
-		$this->cache = $cache;
+		$this->extension_table = $extension_table;
 		$this->filesystem = $filesystem;
+		$this->phpbb_root_path = $phpbb_root_path;
 		$this->php_ext = $php_ext;
-		$this->extension_table = $extension_table;
-		$this->cache_name = $cache_name;
+		$this->user = $user;
 
 		$this->extensions = ($this->cache) ? $this->cache->get($this->cache_name) : false;
 
@@ -150,7 +153,7 @@ class manager
 	*/
 	public function create_extension_metadata_manager($name, \phpbb\template\template $template)
 	{
-		return new \phpbb\extension\metadata_manager($name, $this->config, $this, $template, $this->phpbb_root_path);
+		return new \phpbb\extension\metadata_manager($name, $this->config, $this, $template, $this->user, $this->phpbb_root_path);
 	}
 
 	/**
diff --git a/phpBB/phpbb/extension/metadata_manager.php b/phpBB/phpbb/extension/metadata_manager.php
index 047f0ca54c..5c4e8fbf00 100644
--- a/phpBB/phpbb/extension/metadata_manager.php
+++ b/phpBB/phpbb/extension/metadata_manager.php
@@ -37,6 +37,12 @@ class metadata_manager
 	protected $template;
 
 	/**
+	* phpBB User instance
+	* @var \phpbb\user
+	*/
+	protected $user;
+
+	/**
 	* phpBB root path
 	* @var string
 	*/
@@ -65,15 +71,17 @@ class metadata_manager
 	*
 	* @param string				$ext_name			Name (including vendor) of the extension
 	* @param \phpbb\config\config		$config				phpBB Config instance
-	* @param \phpbb\extension\manager	$extension_manager An instance of the phpBBb extension manager
-	* @param \phpbb\template\template		$template			phpBB Template instance
+	* @param \phpbb\extension\manager	$extension_manager	An instance of the phpBB extension manager
+	* @param \phpbb\template\template	$template			phpBB Template instance
+	* @param \phpbb\user 		$user 				User instance
 	* @param string				$phpbb_root_path	Path to the phpbb includes directory.
 	*/
-	public function __construct($ext_name, \phpbb\config\config $config, \phpbb\extension\manager $extension_manager, \phpbb\template\template $template, $phpbb_root_path)
+	public function __construct($ext_name, \phpbb\config\config $config, \phpbb\extension\manager $extension_manager, \phpbb\template\template $template, \phpbb\user $user, $phpbb_root_path)
 	{
 		$this->config = $config;
 		$this->extension_manager = $extension_manager;
 		$this->template = $template;
+		$this->user = $user;
 		$this->phpbb_root_path = $phpbb_root_path;
 
 		$this->ext_name = $ext_name;
@@ -141,7 +149,7 @@ class metadata_manager
 
 		if (!file_exists($this->metadata_file))
 		{
-			throw new \phpbb\extension\exception('The required file does not exist: ' . $this->metadata_file);
+			throw new \phpbb\extension\exception($this->user->lang('FILE_NOT_FOUND', $this->metadata_file));
 		}
 	}
 
@@ -154,18 +162,18 @@ class metadata_manager
 	{
 		if (!file_exists($this->metadata_file))
 		{
-			throw new \phpbb\extension\exception('The required file does not exist: ' . $this->metadata_file);
+			throw new \phpbb\extension\exception($this->user->lang('FILE_NOT_FOUND', $this->metadata_file));
 		}
 		else
 		{
 			if (!($file_contents = file_get_contents($this->metadata_file)))
 			{
-				throw new \phpbb\extension\exception('file_get_contents failed on ' . $this->metadata_file);
+				throw new \phpbb\extension\exception($this->user->lang('FILE_CONTENT_ERR', $this->metadata_file));
 			}
 
 			if (($metadata = json_decode($file_contents, true)) === null)
 			{
-				throw new \phpbb\extension\exception('json_decode failed on ' . $this->metadata_file);
+				throw new \phpbb\extension\exception($this->user->lang('FILE_JSON_DECODE_ERR', $this->metadata_file));
 			}
 
 			$this->metadata = $metadata;
@@ -224,12 +232,12 @@ class metadata_manager
 				{
 					if (!isset($this->metadata[$name]))
 					{
-						throw new \phpbb\extension\exception("Required meta field '$name' has not been set.");
+						throw new \phpbb\extension\exception($this->user->lang('META_FIELD_NOT_SET', $name));
 					}
 
 					if (!preg_match($fields[$name], $this->metadata[$name]))
 					{
-						throw new \phpbb\extension\exception("Meta field '$name' is invalid.");
+						throw new \phpbb\extension\exception($this->user->lang('META_FIELD_INVALID', $name));
 					}
 				}
 			break;
@@ -247,14 +255,14 @@ class metadata_manager
 	{
 		if (empty($this->metadata['authors']))
 		{
-			throw new \phpbb\extension\exception("Required meta field 'authors' has not been set.");
+			throw new \phpbb\extension\exception($this->user->lang('META_FIELD_NOT_SET', 'authors'));
 		}
 
 		foreach ($this->metadata['authors'] as $author)
 		{
 			if (!isset($author['name']))
 			{
-				throw new \phpbb\extension\exception("Required meta field 'author name' has not been set.");
+				throw new \phpbb\extension\exception($this->user->lang('META_FIELD_NOT_SET', 'author name'));
 			}
 		}
 
diff --git a/phpBB/phpbb/log/log.php b/phpBB/phpbb/log/log.php
index d83fa90a8e..10efe5fd1c 100644
--- a/phpBB/phpbb/log/log.php
+++ b/phpBB/phpbb/log/log.php
@@ -332,6 +332,99 @@ class log implements \phpbb\log\log_interface
 	}
 
 	/**
+	* {@inheritDoc}
+	*/
+	public function delete($mode, $conditions = array())
+	{
+		switch ($mode)
+		{
+			case 'admin':
+				$log_type = LOG_ADMIN;
+				break;
+
+			case 'mod':
+				$log_type = LOG_MOD;
+				break;
+
+			case 'user':
+				$log_type = LOG_USERS;
+				break;
+
+			case 'users':
+				$log_type = LOG_USERS;
+				break;
+
+			case 'critical':
+				$log_type = LOG_CRITICAL;
+				break;
+
+			default:
+				$log_type = false;
+		}
+
+		/**
+		* Allows to modify log data before we delete it from the database
+		*
+		* NOTE: if sql_ary does not contain a log_type value, the entry will
+		* not be deleted in the database. So ensure to set it, if needed.
+		*
+		* @event core.delete_log
+		* @var	string	mode			Mode of the entry we log
+		* @var	string	log_type		Type ID of the log (should be different than false)
+		* @var	array	conditions		An array of conditions, 3 different  forms are accepted
+		* 								1) <key> => <value> transformed into 'AND <key> = <value>' (value should be an integer)
+		*								2) <key> => array(<operator>, <value>) transformed into 'AND <key> <operator> <value>' (values can't be an array)
+		*								3) <key> => array('IN' => array(<values>)) transformed into 'AND <key> IN <values>'
+		*								A special field, keywords, can also be defined. In this case only the log entries that have the keywords in log_operation or log_data will be deleted.
+		* @since 3.1.0-b4
+		*/
+		$vars = array(
+			'mode',
+			'log_type',
+			'conditions',
+		);
+		extract($this->dispatcher->trigger_event('core.delete_log', compact($vars)));
+
+		if ($log_type === false)
+		{
+			return;
+		}
+
+		$sql_where = 'WHERE log_type = ' . $log_type;
+
+		if (isset($conditions['keywords']))
+		{
+			$sql_where .= $this->generate_sql_keyword($conditions['keywords'], '');
+
+			unset($conditions['keywords']);
+		}
+
+		foreach ($conditions as $field => $field_value)
+		{
+			$sql_where .= ' AND ';
+
+			if (is_array($field_value) && sizeof($field_value) == 2 && !is_array($field_value[1]))
+			{
+				$sql_where .= $field . ' ' . $field_value[0] . ' ' . $field_value[1];
+			}
+			else if (is_array($field_value) && isset($field_value['IN']) && is_array($field_value['IN']))
+			{
+				$sql_where .= $this->db->sql_in_set($field, $field_value['IN']);
+			}
+			else
+			{
+				$sql_where .= $field . ' = ' . $field_value;
+			}
+		}
+
+		$sql = 'DELETE FROM ' . LOG_TABLE . "
+					$sql_where";
+		$this->db->sql_query($sql);
+
+		$this->add('admin', $this->user->data['user_id'], $this->user->ip, 'LOG_CLEAR_' . strtoupper($mode));
+	}
+
+	/**
 	* Grab the logs from the database
 	*
 	* {@inheritDoc}
@@ -638,11 +731,13 @@ class log implements \phpbb\log\log_interface
 	/**
 	* Generates a sql condition for the specified keywords
 	*
-	* @param	string	$keywords	The keywords the user specified to search for
+	* @param	string	$keywords			The keywords the user specified to search for
+	* @param	string	$table_alias		The alias of the logs' table ('l.' by default)
+	* @param	string	$statement_operator	The operator used to prefix the statement ('AND' by default)
 	*
 	* @return	string		Returns the SQL condition searching for the keywords
 	*/
-	protected function generate_sql_keyword($keywords)
+	protected function generate_sql_keyword($keywords, $table_alias = 'l.', $statement_operator = 'AND')
 	{
 		// Use no preg_quote for $keywords because this would lead to sole
 		// backslashes being added. We also use an OR connection here for
@@ -687,12 +782,12 @@ class log implements \phpbb\log\log_interface
 				}
 			}
 
-			$sql_keywords = 'AND (';
+			$sql_keywords = ' ' . $statement_operator . ' (';
 			if (!empty($operations))
 			{
-				$sql_keywords .= $this->db->sql_in_set('l.log_operation', $operations) . ' OR ';
+				$sql_keywords .= $this->db->sql_in_set($table_alias . 'log_operation', $operations) . ' OR ';
 			}
-			$sql_lower = $this->db->sql_lower_text('l.log_data');
+			$sql_lower = $this->db->sql_lower_text($table_alias . 'log_data');
 			$sql_keywords .= " $sql_lower " . implode(" OR $sql_lower ", $keywords) . ')';
 		}
 
diff --git a/phpBB/phpbb/log/log_interface.php b/phpBB/phpbb/log/log_interface.php
index 2a44ebecb6..5932f722aa 100644
--- a/phpBB/phpbb/log/log_interface.php
+++ b/phpBB/phpbb/log/log_interface.php
@@ -69,6 +69,18 @@ interface log_interface
 	public function add($mode, $user_id, $log_ip, $log_operation, $log_time = false, $additional_data = array());
 
 	/**
+	* Delete entries in the logs
+	*
+	* @param 	string	$mode		The mode defines which log_type is used and from which log the entries are deleted
+	* @param 	array	$conditions	An array of conditions, 3 different  forms are accepted
+	* 								1) <key> => <value> transformed into 'AND <key> = <value>' (value should be an integer)
+	*								2) <key> => array(<operator>, <value>) transformed into 'AND <key> <operator> <value>' (values can't be an array)
+	*								3) <key> => array('IN' => array(<values>)) transformed into 'AND <key> IN <values>'
+	*								A special field, keywords, can also be defined. In this case only the log entries that have the keywords in log_operation or log_data will be deleted.
+	*/
+	public function delete($mode, $conditions = array());
+
+	/**
 	* Grab the logs from the database
 	*
 	* @param	string	$mode			The mode defines which log_type is used and ifrom which log the entry is retrieved
diff --git a/phpBB/phpbb/log/null.php b/phpBB/phpbb/log/null.php
index 7b11cc9e21..baa78895ea 100644
--- a/phpBB/phpbb/log/null.php
+++ b/phpBB/phpbb/log/null.php
@@ -51,6 +51,13 @@ class null implements log_interface
 	/**
 	* {@inheritdoc}
 	*/
+	public function delete($mode, $conditions = array())
+	{
+	}
+
+	/**
+	* {@inheritdoc}
+	*/
 	public function get_logs($mode, $count_logs = true, $limit = 0, $offset = 0, $forum_id = 0, $topic_id = 0, $user_id = 0, $log_time = 0, $sort_by = 'l.log_time DESC', $keywords = '')
 	{
 		return array();