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Current File : /var/www/web032/htdocs/cms/libraries/fof40/Update/Collection.php
<?php
/**
 * @package   FOF
 * @copyright Copyright (c)2010-2021 Nicholas K. Dionysopoulos / Akeeba Ltd
 * @license   GNU General Public License version 2, or later
 */

namespace FOF40\Update;

defined('_JEXEC') || die;

use Exception;
use FOF40\Container\Container;
use FOF40\Download\Download;
use SimpleXMLElement;

class Collection
{
	/**
	 * Reads a "collection" XML update source and returns the complete tree of categories
	 * and extensions applicable for platform version $jVersion
	 *
	 * @param   string       $url       The collection XML update source URL to read from
	 * @param   string|null  $jVersion  Joomla! version to fetch updates for, or null to use JVERSION
	 *
	 * @return  array  A list of update sources applicable to $jVersion
	 */
	public function getAllUpdates(string $url, ?string $jVersion = null): array
	{
		// Get the target platform
		if (is_null($jVersion))
		{
			$jVersion = JVERSION;
		}

		// Initialise return value
		$updates = [
			'metadata'   => [
				'name'        => '',
				'description' => '',
			],
			'categories' => [],
			'extensions' => [],
		];

		// Download and parse the XML file
		$container  = Container::getInstance('com_foobar');
		$downloader = new Download($container);
		$xmlSource  = $downloader->getFromURL($url);

		try
		{
			$xml = new SimpleXMLElement($xmlSource, LIBXML_NONET);
		}
		catch (Exception $e)
		{
			return $updates;
		}

		// Sanity check
		if (($xml->getName() != 'extensionset'))
		{
			unset($xml);

			return $updates;
		}

		// Initialise return value with the stream metadata (name, description)
		$rootAttributes = $xml->attributes();
		foreach ($rootAttributes as $k => $v)
		{
			$updates['metadata'][$k] = (string) $v;
		}

		// Initialise the raw list of updates
		$rawUpdates = [
			'categories' => [],
			'extensions' => [],
		];

		// Segregate the raw list to a hierarchy of extension and category entries
		/** @var SimpleXMLElement $extension */
		foreach ($xml->children() as $extension)
		{
			switch ($extension->getName())
			{
				case 'category':
					// These are the parameters we expect in a category
					$params = [
						'name'                  => '',
						'description'           => '',
						'category'              => '',
						'ref'                   => '',
						'targetplatformversion' => $jVersion,
					];

					// These are the attributes of the element
					$attributes = $extension->attributes();

					// Merge them all
					foreach ($attributes as $k => $v)
					{
						$params[$k] = (string) $v;
					}

					// We can't have a category with an empty category name
					if (empty($params['category']))
					{
						continue;
					}

					// We can't have a category with an empty ref
					if (empty($params['ref']))
					{
						continue;
					}

					if (empty($params['description']))
					{
						$params['description'] = $params['category'];
					}

					if (!array_key_exists($params['category'], $rawUpdates['categories']))
					{
						$rawUpdates['categories'][$params['category']] = [];
					}

					$rawUpdates['categories'][$params['category']][] = $params;

					break;

				case 'extension':
					// These are the parameters we expect in a category
					$params = [
						'element'               => '',
						'type'                  => '',
						'version'               => '',
						'name'                  => '',
						'detailsurl'            => '',
						'targetplatformversion' => $jVersion,
					];

					// These are the attributes of the element
					$attributes = $extension->attributes();

					// Merge them all
					foreach ($attributes as $k => $v)
					{
						$params[$k] = (string) $v;
					}

					// We can't have an extension with an empty element
					if (empty($params['element']))
					{
						continue;
					}

					// We can't have an extension with an empty type
					if (empty($params['type']))
					{
						continue;
					}

					// We can't have an extension with an empty version
					if (empty($params['version']))
					{
						continue;
					}

					if (empty($params['name']))
					{
						$params['name'] = $params['element'] . ' ' . $params['version'];
					}

					if (!array_key_exists($params['type'], $rawUpdates['extensions']))
					{
						$rawUpdates['extensions'][$params['type']] = [];
					}

					if (!array_key_exists($params['element'], $rawUpdates['extensions'][$params['type']]))
					{
						$rawUpdates['extensions'][$params['type']][$params['element']] = [];
					}

					$rawUpdates['extensions'][$params['type']][$params['element']][] = $params;
					break;

				default:
					break;
			}
		}

		unset($xml);

		foreach ($rawUpdates['categories'] as $category => $entries)
		{
			$update                           = $this->filterListByPlatform($entries, $jVersion);
			$updates['categories'][$category] = $update;
		}

		foreach ($rawUpdates['extensions'] as $type => $extensions)
		{
			$updates['extensions'][$type] = [];

			foreach ($extensions as $element => $entries)
			{
				$update                                 = $this->filterListByPlatform($entries, $jVersion);
				$updates['extensions'][$type][$element] = $update;
			}
		}

		return $updates;
	}

	/**
	 * Returns only the category definitions of a collection
	 *
	 * @param   string       $url       The URL of the collection update source
	 * @param   string|null  $jVersion  Joomla! version to fetch updates for, or null to use JVERSION
	 *
	 * @return  array  An array of category update definitions
	 */
	public function getCategories(string $url, ?string $jVersion = null): array
	{
		$allUpdates = $this->getAllUpdates($url, $jVersion);

		return $allUpdates['categories'];
	}

	/**
	 * Returns the update source for a specific category
	 *
	 * @param   string       $url       The URL of the collection update source
	 * @param   string       $category  The category name you want to get the update source URL of
	 * @param   string|null  $jVersion  Joomla! version to fetch updates for, or null to use JVERSION
	 *
	 * @return  string|null  The update stream URL, or null if it's not found
	 */
	public function getCategoryUpdateSource(string $url, string $category, ?string $jVersion = null): ?string
	{
		$allUpdates = $this->getAllUpdates($url, $jVersion);

		if (array_key_exists($category, $allUpdates['categories']))
		{
			return $allUpdates['categories'][$category]['ref'];
		}
		else
		{
			return null;
		}
	}

	/**
	 * Get a list of updates for extensions only, optionally of a specific type
	 *
	 * @param   string       $url       The URL of the collection update source
	 * @param   string       $type      The extension type you want to get the update source URL of, empty to get all
	 *                                  extension types
	 * @param   string|null  $jVersion  Joomla! version to fetch updates for, or null to use JVERSION
	 *
	 * @return  array|null  An array of extension update definitions or null if none is found
	 */
	public function getExtensions(string $url, ?string $type = null, ?string $jVersion = null): ?array
	{
		$allUpdates = $this->getAllUpdates($url, $jVersion);

		if (empty($type))
		{
			return $allUpdates['extensions'];
		}
		elseif (array_key_exists($type, $allUpdates['extensions']))
		{
			return $allUpdates['extensions'][$type];
		}
		else
		{
			return null;
		}
	}

	/**
	 * Get the update source URL for a specific extension, based on the type and element, e.g.
	 * type=file and element=joomla is Joomla! itself.
	 *
	 * @param   string       $url       The URL of the collection update source
	 * @param   string       $type      The extension type you want to get the update source URL of
	 * @param   string       $element   The extension element you want to get the update source URL of
	 * @param   string|null  $jVersion  Joomla! version to fetch updates for, or null to use JVERSION
	 *
	 * @return  string|null  The update source URL or null if the extension is not found
	 */
	public function getExtensionUpdateSource(string $url, string $type, string $element, ?string $jVersion = null): ?string
	{
		$allUpdates = $this->getExtensions($url, $type, $jVersion);

		if (empty($allUpdates))
		{
			return null;
		}
		elseif (array_key_exists($element, $allUpdates))
		{
			return $allUpdates[$element]['detailsurl'];
		}
		else
		{
			return null;
		}
	}

	/**
	 * Filters a list of updates, returning only those available for the
	 * specified platform version $jVersion
	 *
	 * @param   array   $updates   An array containing update definitions (categories or extensions)
	 * @param   string  $jVersion  Joomla! version to fetch updates for, or null to use JVERSION
	 *
	 * @return  array|null  The update definition that is compatible, or null if none is compatible
	 */
	private function filterListByPlatform(array $updates, ?string $jVersion = null): ?array
	{
		// Get the target platform
		if (is_null($jVersion))
		{
			$jVersion = JVERSION;
		}

		$versionParts          = explode('.', $jVersion, 4);
		$platformVersionMajor  = $versionParts[0];
		$platformVersionMinor  = (count($versionParts) > 1) ? $platformVersionMajor . '.' . $versionParts[1] : $platformVersionMajor;
		$platformVersionNormal = (count($versionParts) > 2) ? $platformVersionMinor . '.' . $versionParts[2] : $platformVersionMinor;
		$platformVersionFull   = (count($versionParts) > 3) ? $platformVersionNormal . '.' . $versionParts[3] : $platformVersionNormal;

		$pickedExtension   = null;
		$pickedSpecificity = -1;

		foreach ($updates as $update)
		{
			// Test the target platform
			$targetPlatform = (string) $update['targetplatformversion'];

			if ($targetPlatform === $platformVersionFull)
			{
				$pickedExtension   = $update;
				$pickedSpecificity = 4;
			}
			elseif (($targetPlatform === $platformVersionNormal) && ($pickedSpecificity <= 3))
			{
				$pickedExtension   = $update;
				$pickedSpecificity = 3;
			}
			elseif (($targetPlatform === $platformVersionMinor) && ($pickedSpecificity <= 2))
			{
				$pickedExtension   = $update;
				$pickedSpecificity = 2;
			}
			elseif (($targetPlatform === $platformVersionMajor) && ($pickedSpecificity <= 1))
			{
				$pickedExtension   = $update;
				$pickedSpecificity = 1;
			}
		}

		return $pickedExtension;
	}
}

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