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<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
* Abstract class for the external transformations plugins
*
* @package PhpMyAdmin-Transformations
* @subpackage External
*/
if (! defined('PHPMYADMIN')) {
exit;
}
/* Get the transformations interface */
require_once 'libraries/plugins/TransformationsPlugin.class.php';
/**
* Provides common methods for all of the external transformations plugins.
*
* @package PhpMyAdmin
*/
abstract class ExternalTransformationsPlugin extends TransformationsPlugin
{
/**
* Gets the transformation description of the specific plugin
*
* @return string
*/
public static function getInfo()
{
return __(
'LINUX ONLY: Launches an external application and feeds it the column'
. ' data via standard input. Returns the standard output of the'
. ' application. The default is Tidy, to pretty-print HTML code.'
. ' For security reasons, you have to manually edit the file'
. ' libraries/plugins/transformations/Text_Plain_External'
. '.class.php and list the tools you want to make available.'
. ' The first option is then the number of the program you want to'
. ' use and the second option is the parameters for the program.'
. ' The third option, if set to 1, will convert the output using'
. ' htmlspecialchars() (Default 1). The fourth option, if set to 1,'
. ' will prevent wrapping and ensure that the output appears all on'
. ' one line (Default 1).'
);
}
/**
* Enables no-wrapping
*
* @param array $options transformation options
*
* @return bool
*/
public function applyTransformationNoWrap($options = array())
{
if (! isset($options[3]) || $options[3] == '') {
$nowrap = true;
} elseif ($options[3] == '1' || $options[3] == 1) {
$nowrap = true;
} else {
$nowrap = false;
}
return $nowrap;
}
/**
* Does the actual work of each specific transformations plugin.
*
* @param string $buffer text to be transformed
* @param array $options transformation options
* @param string $meta meta information
*
* @return string
*/
public function applyTransformation($buffer, $options = array(), $meta = '')
{
// possibly use a global transform and feed it with special options
// further operations on $buffer using the $options[] array.
$allowed_programs = array();
//
// WARNING:
//
// It's up to administrator to allow anything here. Note that users may
// specify any parameters, so when programs allow output redirection or
// any other possibly dangerous operations, you should write wrapper
// script that will publish only functions you really want.
//
// Add here program definitions like (note that these are NOT safe
// programs):
//
//$allowed_programs[0] = '/usr/local/bin/tidy';
//$allowed_programs[1] = '/usr/local/bin/validate';
// no-op when no allowed programs
if (count($allowed_programs) == 0) {
return $buffer;
}
if (! isset($options[0])
|| $options[0] == ''
|| ! isset($allowed_programs[$options[0]])
) {
$program = $allowed_programs[0];
} else {
$program = $allowed_programs[$options[0]];
}
if (!isset($options[1]) || $options[1] == '') {
$poptions = '-f /dev/null -i -wrap -q';
} else {
$poptions = $options[1];
}
if (!isset($options[2]) || $options[2] == '') {
$options[2] = 1;
}
if (!isset($options[3]) || $options[3] == '') {
$options[3] = 1;
}
// needs PHP >= 4.3.0
$newstring = '';
$descriptorspec = array(
0 => array("pipe", "r"),
1 => array("pipe", "w")
);
$process = proc_open($program . ' ' . $poptions, $descriptorspec, $pipes);
if (is_resource($process)) {
fwrite($pipes[0], $buffer);
fclose($pipes[0]);
while (!feof($pipes[1])) {
$newstring .= fgets($pipes[1], 1024);
}
fclose($pipes[1]);
// we don't currently use the return value
proc_close($process);
}
if ($options[2] == 1 || $options[2] == '2') {
$retstring = htmlspecialchars($newstring);
} else {
$retstring = $newstring;
}
return $retstring;
}
/**
* This method is called when any PluginManager to which the observer
* is attached calls PluginManager::notify()
*
* @param SplSubject $subject The PluginManager notifying the observer
* of an update.
*
* @todo implement
* @return void
*/
public function update (SplSubject $subject)
{
;
}
/* ~~~~~~~~~~~~~~~~~~~~ Getters and Setters ~~~~~~~~~~~~~~~~~~~~ */
/**
* Gets the transformation name of the specific plugin
*
* @return string
*/
public static function getName()
{
return "External";
}
}
?>
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