path: root/pluginpackage.php

<?php

/*
 * File: ratatoeskr/sys/pluginpackage.php
 * Handle plugin packages easily.
 * 
 * License:
 * This file is part of Ratatöskr.
 * Unlike the other parts of Ratatöskr, *this* file ist *not* licensed under the
 * MIT / X11 License, but under the WTFPL, to make it even easier to use this
 * file in other projects.
 * See "ratatoeskr/licenses/wtfpl" for more information.
 */

/*
 * Function: dir2array
 * Pack a directory into an array.
 * 
 * Parameters:
 * 	$dir - The directory to pack.
 * 
 * Returns:
 * 	Associative array. Keys are filenames, values are either the file's content as a string or another array, if it's a directory.
 */
function dir2array($dir)
{
	$rv = array();
	foreach(scandir($dir) as $fn)
	{
		if(($fn == ".") or ($fn == ".."))
			continue;
		$fn_new = $dir . "/" . $fn;
		if(is_dir($fn_new))
			$rv[$fn] = dir2array($fn_new);
		elseif(is_file($fn_new))
			$rv[$fn] = file_get_contents($fn_new);
	}
	return $rv;
}

/*
 * Function: array2dir
 * Unpack an array into a directory.
 * 
 * Parameters:
 * 	$a   - Array to unpack.
 * 	$dir - Directory to unpack to.
 */
function array2dir($a, $dir)
{
	if(!is_dir($dir))
		mkdir($dir);
	
	foreach($a as $k => $v)
	{
		$k = "$dir/$k";
		if(is_array($v))
			array2dir($v, $k);
		else
			file_put_contents($k, $v);
	}
}

/*
 * Class: InvalidPackage
 * An Exception that <PluginPackage>'s function can throw, if the package is invalid.
 */
class InvalidPackage extends Exception {}

/*
 * Class: PluginPackage
 * A plugin package representation.
 */
class PluginPackage
{
	public static $magic = "R7RPLGPACKV001";
	
	/*
	 * Variables: Mandatory values
	 * 
	 * $code              - The plugin code
	 * $classname         - The name of the plugins main class
	 * $name              - Name of the plugin (must be at least one character, allowed chars: a-z A-Z 0-9 - _)
	 * $author            - The author of the plugin (preferably in the format: Name<mail@address>)
	 * $versiontext       - A text to describe the current version, something like "1.1 Beta"
	 * $versioncount      - A number for this version, should be increased with every release
	 * $api               - The used API version
	 * $short_description - A short description.
	 */
	public $code              = NULL;
	public $classname         = NULL;
	public $name              = NULL;
	public $author            = NULL;
	public $versiontext       = NULL;
	public $versioncount      = NULL;
	public $api               = NULL;
	public $short_description = NULL;
	
	/*
	 * Variables: Optional values
	 *
	 * $updatepath - A URL that points to a update information resource (serialize'd array("current-version" => VERSIONCOUNT, "dl-path" => DOWNLOAD PATH); will get overwritten/set by the default repository software.
	 * $web        - A URL to the webpage for the plugin. If left empty, the default repository software will set this to the description page of your plugin.
	 * $license    - The license text of your plugin.
	 * $help       - A help / manual (formatted in HTML) for your plugin.
	 * $custompub  - <dir2array> 'd directory that contains custom public(i.e. can later be accessed from the web) data.
	 * $custompriv - <dir2array> 'd directory that contains custom private data.
	 * $tpls       - <dir2array> 'd directory containing custom STE templates.
	 */
	public $updatepath = NULL;
	public $web        = NULL;
	public $license    = NULL;
	public $help       = NULL;
	public $custompub  = NULL;
	public $custompriv = NULL;
	public $tpls       = NULL;
	
	/*
	 * Function: validate
	 * Validate, if the variables are set correctly.
	 * Will throw an <InvalidPackage> exception if invalid.
	 */
	public function validate()
	{
		function validate_url     ($u) { return preg_match("/^http[s]{0,1}:\\/\\/.*$/", $u) != 0; }
		function validate_arraydir($a)
		{
			if(!is_array($a))
				return False;
			foreach($a as $k=>$v)
			{
				if(!is_string($k))
					return False;
				if(is_array($v) and (!validate_arraydir($v)))
					return False;
				elseif(!is_string($v))
					return False;
			}
			return True;
		}
		
		if(!is_string($this->code))
			throw new InvalidPackage("Invalid code value.");
		if(!is_string($this->classname))
			throw new InvalidPackage("Invalid classname value.");
		if(preg_match("/^[a-zA-Z0-9_\\-]+$/", $this->name) == 0)
			throw new InvalidPackage("Invalid name value (must be at least 1 character, accepted chars: a-z A-Z 0-9 - _).");
		if(!is_string($this->author))
			throw new InvalidPackage("Invalid author value.");
		if(!is_string($this->versiontext))
			throw new InvalidPackage("Invalid versiontext value.");
		if(!is_numeric($this->versioncount))
			throw new InvalidPackage("Invalid versioncount value. Must be a number.");
		if(!is_numeric($this->api))
			throw new InvalidPackage("Invalid api value. Must be a number.");
		if(!is_string($this->short_description))
			throw new InvalidPackage("Invalid short_description value.");
		
		if(($this->updatepath !== NULL) and (!validate_url($this->updatepath)))
			throw new InvalidPackage("Invalid updatepath value. Must be an URL.");
		if(($this->web !== NULL) and (!validate_url($this->web)))
			throw new InvalidPackage("Invalid web value. Must be an URL.");
		if(($this->license !== NULL) and (!is_string($this->license)))
			throw new InvalidPackage("Invalid license value.");
		if(($this->help !== NULL) and (!is_string($this->help)))
			throw new InvalidPackage("Invalid help value.");
		if(($this->custompub !== NULL) and (!validate_arraydir($this->custompub)))
			throw new InvalidPackage("Invalid custompub value.");
		if(($this->custompriv !== NULL) and (!validate_arraydir($this->custompriv)))
			throw new InvalidPackage("Invalid custompriv value.");
		if(($this->tpls !== NULL) and (!validate_arraydir($this->tpls)))
			throw new InvalidPackage("Invalid tpls value.");
		return True;
	}
	
	/*
	 * Function: load
	 * Load a plugin package from binary data.
	 * 
	 * Parameters:
	 * 	$plugin_raw - The raw package to load.
	 * 
	 * Returns:
	 * 	The <PluginPackage> object.
	 * 
	 * Throws:
	 * 	<InvalidPackage> if package is invalid.
	 */
	public static function load($plugin_raw)
	{
		/* Read and compare magic number */
		$magic = substr($plugin_raw, 0, strlen(self::$magic));
		if($magic != self::$magic)
			throw new InvalidPackage("Wrong magic number");
		
		/* Read sha1sum and uncompress serialized plugin, then compare the hash */
		$sha1sum   = substr($plugin_raw, strlen(self::$magic), 20);
		$pluginser = gzuncompress(substr($plugin_raw, strlen(self::$magic) + 20));
		if(sha1($pluginser, True) != $sha1sum)
			throw new InvalidPackage("Wrong SHA1 hash");
		
		$plugin = @unserialize($pluginser);
		if(!($plugin instanceof self))
			throw new InvalidPackage("Not the correct class or not unserializeable.");
		
		$plugin->validate();
		
		return $plugin;
	}
	
	/*
	 * Function: save
	 * Save the plugin.
	 * 
	 * Returns:
	 * 	A binary plugin package.
	 * 
	 * Throws:
	 * 	<InvalidPackage> if package is invalid.
	 */
	public function save()
	{
		$this->validate();
		$ser = serialize($this);
		return self::$magic . sha1($ser, True) . gzcompress($ser, 9);
	}
	
	/*
	 * Function: extract_meta
	 * Get just the metadata of this package.
	 * 
	 * Returns:
	 * 	A <PluginPackageMeta> object.
	 */
	public function extract_meta()
	{
		$meta = new PluginPackageMeta();
		
		$meta->name              = $this>name;
		$meta->author            = $this>author;
		$meta->versiontext       = $this>versiontext;
		$meta->versioncount      = $this>versioncount;
		$meta->api               = $this>api;
		$meta->short_description = $this>short_description;
		$meta->updatepath        = $this>updatepath;
		$meta->web               = $this>web;
		$meta->license           = $this>license;
		
		return $meta;
	}
}

/*
 * Class: PluginPackageMeta
 * Only the metadata of a <PluginPackage>.
 */
class PluginPackageMeta
{
	/*
	 * Variables: Mandatory values
	 * 
	 * $name              - Name of the plugin (must be at least one character, allowed chars: a-z A-Z 0-9 - _)
	 * $author            - The author of the plugin (preferably in the format: Name<mail@address>)
	 * $versiontext       - A text to describe the current version, something like "1.1 Beta"
	 * $versioncount      - A number for this version, should be increased with every release
	 * $api               - The used API version
	 * $short_description - A short description.
	 */
	public $name              = NULL;
	public $author            = NULL;
	public $versiontext       = NULL;
	public $versioncount      = NULL;
	public $api               = NULL;
	public $short_description = NULL;
	
	/*
	 * Variables: Optional values
	 *
	 * $updatepath - A URL that points to a update information resource (serialize'd array("current-version" => VERSIONCOUNT, "dl-path" => DOWNLOAD PATH); will get overwritten/set by the default repository software.
	 * $web        - A URL to the webpage for the plugin. If left empty, the default repository software will set this to the description page of your plugin.
	 * $license    - The license text of your plugin.
	 */
	public $updatepath = NULL;
	public $web        = NULL;
	public $license    = NULL;
}

?>