<?php
/**
 * @package    Joomla.JEDChecker
 *
 * @copyright  Copyright (C) 2021 Open Source Matters, Inc. All rights reserved.
 *
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('_JEXEC') or die('Restricted access');


// Include the rule base class
require_once JPATH_COMPONENT_ADMINISTRATOR . '/models/rule.php';


/**
 * class JedcheckerRulesXMLFiles
 *
 * This class searches all xml manifests for valid files declarations
 *
 * @since  2.3
 */
class JedcheckerRulesXMLFiles extends JEDcheckerRule
{
	/**
	 * The formal ID of this rule. For example: SE1.
	 *
	 * @var    string
	 */
	protected $id = 'XMLFILES';

	/**
	 * The title or caption of this rule.
	 *
	 * @var    string
	 */
	protected $title = 'COM_JEDCHECKER_XML_FILES';

	/**
	 * The description of this rule.
	 *
	 * @var    string
	 */
	protected $description = 'COM_JEDCHECKER_XML_FILES_DESC';

	/**
	 * List of errors.
	 *
	 * @var    string[]
	 */
	protected $errors;

	/**
	 * Initiates the search and check
	 *
	 * @return    void
	 */
	public function check()
	{
		// Find all XML files of the extension
		$files = JFolder::files($this->basedir, '\.xml$', true, true);

		// Iterate through all the xml files
		foreach ($files as $file)
		{
			// Try to check the file
			$this->find($file);
		}
	}

	/**
	 * Reads a file and validate XML manifest
	 *
	 * @param   string  $file  - The path to the file
	 *
	 * @return boolean True if the manifest file was found, otherwise False.
	 */
	protected function find($file)
	{
		$xml = simplexml_load_file($file);

		// Failed to parse the xml file.
		// Assume that this is not a extension manifest
		if (!$xml)
		{
			return false;
		}

		// Check if this is an extension manifest
		if ($xml->getName() !== 'extension')
		{
			return false;
		}

		$this->errors = array();

		// Check declared files and folders do exist

		$basedir = dirname($file) . '/';

		// Check: files[folder] (filename|folder)*
		// ( for package: files[folder] (file|folder)* )
		if (isset($xml->files))
		{
			$node = $xml->files;
			$dir = $basedir . (isset($node['folder']) ? $node['folder'] . '/' : '');
			$this->checkFiles($node->filename, $dir);
			$this->checkFiles($node->file, $dir);
			$this->checkFolders($node->folder, $dir);
		}

		// Check: media[folder] (filename|folder)*
		if (isset($xml->media))
		{
			$node = $xml->media;
			$dir = $basedir . (isset($node['folder']) ? $node['folder'] . '/' : '');
			$this->checkFiles($node->filename, $dir);
			$this->checkFolders($node->folder, $dir);
		}

		// Check: fonts[folder] (filename|folder)*
		if (isset($xml->fonts))
		{
			$node = $xml->fonts;
			$dir = $basedir . (isset($node['folder']) ? $node['folder'] . '/' : '');
			$this->checkFiles($node->filename, $dir);
			$this->checkFolders($node->folder, $dir);
		}

		// Check files: languages[folder] language*
		if (isset($xml->languages))
		{
			$node = $xml->languages;
			$dir = $basedir . (isset($node['folder']) ? $node['folder'] . '/' : '');
			$this->checkFiles($node->language, $dir);
		}

		$admindir = $basedir;

		// Check: administration files[folder] (filename|folder)*
		if (isset($xml->administration->files))
		{
			$node = $xml->administration->files;
			$admindir = $basedir . (isset($node['folder']) ? $node['folder'] . '/' : '');
			$this->checkFiles($node->filename, $admindir);
			$this->checkFolders($node->folder, $admindir);
		}

		// Check: administration media[folder] (filename|folder)*
		if (isset($xml->administration->media))
		{
			$node = $xml->administration->media;
			$dir = $basedir . (isset($node['folder']) ? $node['folder'] . '/' : '');
			$this->checkFiles($node->filename, $dir);
			$this->checkFolders($node->folder, $dir);
		}

		// Check files: administration languages[folder] language*
		if (isset($xml->administration->languages))
		{
			$node = $xml->administration->languages;
			$dir = $basedir . (isset($node['folder']) ? $node['folder'] . '/' : '');
			$this->checkFiles($node->language, $dir);
		}

		// For type="file" extensions:
		// Check files: fileset files[folder] (filename|file|folder)*
		if (isset($xml->fileset->files))
		{
			$node = $xml->fileset->files;
			$dir = $basedir . (isset($node['folder']) ? $node['folder'] . '/' : '');
			$this->checkFiles($node->filename, $dir);
			$this->checkFiles($node->file, $dir);
			$this->checkFolders($node->folder, $dir);
		}

		// Check file: scriptfile
		if (isset($xml->scriptfile))
		{
			$this->checkFiles($xml->scriptfile, $basedir);
		}

		// Check files: install sql file*
		if (isset($xml->install->sql->file))
		{
			$this->checkFiles($xml->install->sql->file, $admindir);
		}

		// Check files: uninstall sql file*
		if (isset($xml->uninstall->sql->file))
		{
			$this->checkFiles($xml->uninstall->sql->file, $admindir);
		}

		// Check folders: update schemas schemapath*
		if (isset($xml->update->schemas->schemapath))
		{
			$this->checkFolders($xml->update->schemas->schemapath, $admindir);
		}

		// Check: config [add...path] directories exist
		if (isset($xml->config))
		{
			$attributes = array('addfieldpath', 'addformpath', 'addrulepath');

			$extensionPath = false;

			// @TODO move element name extraction into a helper (similar code is used in XMLinfo rule)
			switch ((string) $xml['type'])
			{
				case 'module':
					if (isset($xml->element))
					{
						$element = (string) $xml->element;
					}
					else
					{
						$element = (string) $xml->name;

						if (isset($xml->files))
						{
							foreach ($xml->files->children() as $child)
							{
								if (isset($child['module']))
								{
									$element = (string) $child['module'];
									break;
								}
							}
						}
					}

					$element = strtolower(JFilterInput::getInstance()->clean($element, 'cmd'));

					$extensionPath = 'modules/' . $element . '/';
					break;

				case 'plugin':
					if (isset($xml->element))
					{
						$element = (string) $xml->element;
					}
					else
					{
						$element = (string) $xml->name;

						if (isset($xml->files))
						{
							foreach ($xml->files->children() as $child)
							{
								if (isset($child['plugin']))
								{
									$element = (string) $child['plugin'];
									break;
								}
							}
						}
					}

					$element = strtolower(JFilterInput::getInstance()->clean($element, 'cmd'));

					$group = (string) $xml['group'];

					$extensionPath = 'plugins/' . $group . '/' . $element . '/';
					break;

				case 'template':
					if (isset($xml->element))
					{
						$element = (string) $xml->element;
					}
					else
					{
						$element = (string) $xml->name;
					}

					$element = strtolower(JFilterInput::getInstance()->clean($element, 'cmd'));

					$extensionPath = 'templates/' . $element . '/';
			}

			if ($extensionPath !== false)
			{
				foreach ($attributes as $attribute)
				{
					foreach ($xml->config->xpath('//*[@' . $attribute . ']') as $node)
					{
						$attrPath = (string) $node[$attribute];
						$folder = ltrim($attrPath, '/');

						// Convert absolute path to relative (if matches extension path)
						if (strpos($folder, $extensionPath) === 0)
						{
							$folder = $sitedir . substr($folder, strlen($extensionPath));

							if (!is_dir($folder))
							{
								$this->errors[] = JText::sprintf('COM_JEDCHECKER_XML_FILES_FOLDER_NOT_FOUND', $attrPath);
							}
						}
					}
				}
			}
		}

		if (count($this->errors))
		{
			$this->report->addError($file, implode('<br />', $this->errors));
		}

		// All checks passed. Return true
		return true;
	}

	/**
	 * Check files exist
	 *
	 * @param   SimpleXMLElement  $files  Files to check
	 * @param   string            $dir    Base directory
	 *
	 * @return  void
	 */
	protected function checkFiles($files, $dir)
	{
		foreach ($files as $file)
		{
			$filename = $dir . $file;

			if (is_file($filename))
			{
				continue;
			}

			// Extra check for unzipped files
			if (preg_match('/^(.*)\.(zip|tgz|tar\.gz)$/', $filename, $matches) && is_dir($matches[1]))
			{
				continue;
			}

			$this->errors[] = JText::sprintf('COM_JEDCHECKER_XML_FILES_FILE_NOT_FOUND', (string) $file);
		}
	}

	/**
	 * Check folders exist
	 *
	 * @param   SimpleXMLElement  $folders  Directories to check
	 * @param   string            $dir      Base directory
	 *
	 * @return  void
	 */
	protected function checkFolders($folders, $dir)
	{
		foreach ($folders as $folder)
		{
			if (!is_dir($dir . $folder))
			{
				$this->errors[] = JText::sprintf('COM_JEDCHECKER_XML_FILES_FOLDER_NOT_FOUND', (string) $folder);
			}
		}
	}
}