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<?php
/**
* Class holding functions for displaying widgets.
*/
class WidgetRenderer {
// A randomly-generated string, used to prevent malicious users from
// spoofing the output of #widget in order to have arbitrary
// JavaScript show up in the page's output.
static $mRandomString;
public static function initRandomString() {
// Set the random string, used in both encoding and decoding.
self::$mRandomString = substr( base64_encode( rand() ), 0, 7 );
}
public static function renderWidget( &$parser, $widgetName ) {
global $IP, $wgWidgetsCompileDir;
$smarty = new Smarty;
$smarty->left_delimiter = '<!--{';
$smarty->right_delimiter = '}-->';
$smarty->compile_dir = $wgWidgetsCompileDir;
// registering custom Smarty plugins
$smarty->addPluginsDir( "$IP/extensions/Widgets/smarty_plugins/" );
$smarty->enableSecurity();
// These settings were for Smarty v2 - they don't seem to
// have an equivalent in Smarty v3.
/*
$smarty->security_settings = array(
'IF_FUNCS' => array(
'is_array',
'isset',
'array',
'list',
'count',
'sizeof',
'in_array',
'true',
'false',
'null'
),
'MODIFIER_FUNCS' => array( 'validate' )
);
*/
// Register the Widgets extension functions.
$smarty->registerResource(
'wiki',
array(
array( 'WidgetRenderer', 'wiki_get_template' ),
array( 'WidgetRenderer', 'wiki_get_timestamp' ),
array( 'WidgetRenderer', 'wiki_get_secure' ),
array( 'WidgetRenderer', 'wiki_get_trusted' )
)
);
$params = func_get_args();
// The first and second params are the parser and the widget
// name - we already have both.
array_shift( $params );
array_shift( $params );
$params_tree = array();
foreach ( $params as $param ) {
$pair = explode( '=', $param, 2 );
if ( count( $pair ) == 2 ) {
$key = trim( $pair[0] );
$val = trim( $pair[1] );
} else {
$key = $param;
$val = true;
}
if ( $val == 'false' ) {
$val = false;
}
/* If the name of the parameter has object notation
a.b.c.d
then we assign stuff to hash of hashes, not scalar
*/
$keys = explode( '.', $key );
// $subtree will be moved from top to the bottom and
// at the end will point to the last level.
$subtree =& $params_tree;
// Go through all the keys but the last one.
$last_key = array_pop( $keys );
foreach ( $keys as $subkey ) {
// If next level of subtree doesn't exist yet,
// create an empty one.
if ( !array_key_exists( $subkey, $subtree ) ) {
$subtree[$subkey] = array();
}
// move to the lower level
$subtree =& $subtree[$subkey];
}
// last portion of the key points to itself
if ( isset( $subtree[$last_key] ) ) {
// If this is already an array, push into it;
// otherwise, convert into an array first.
if ( !is_array( $subtree[$last_key] ) ) {
$subtree[$last_key] = array( $subtree[$last_key] );
}
$subtree[$last_key][] = $val;
} else {
// doesn't exist yet, just setting a value
$subtree[$last_key] = $val;
}
}
$smarty->assign( $params_tree );
try {
$output = $smarty->fetch( "wiki:$widgetName" );
} catch ( Exception $e ) {
return '<div class=\"error\">' . wfMsgExt( 'widgets-error', array( 'parsemag' ), htmlentities( $widgetName ) ) . '</div>';
}
// Hide the widget from the parser.
$output = 'ENCODED_CONTENT ' . self::$mRandomString . base64_encode($output) . ' END_ENCODED_CONTENT';
return array( $output, 'noparse' => true, 'isHTML' => true );
}
public static function processEncodedWidgetOutput( &$out, &$text ) {
// Find all hidden content and restore to normal
$text = preg_replace_callback(
'/ENCODED_CONTENT ' . self::$mRandomString . '([0-9a-zA-Z\/+]+=*)* END_ENCODED_CONTENT/',
function( $matches ) {
return base64_decode( $matches[1]);
},
$text
);
return true;
}
// the following four functions are all registered with Smarty
public static function wiki_get_template( $widgetName, &$widgetCode, $smarty_obj ) {
global $wgWidgetsUseFlaggedRevs;
$widgetTitle = Title::newFromText( $widgetName, NS_WIDGET );
if ( $widgetTitle && $widgetTitle->exists() ) {
if ( $wgWidgetsUseFlaggedRevs ) {
$flaggedWidgetArticle = FlaggedArticle::getTitleInstance( $widgetTitle );
$flaggedWidgetArticleRevision = $flaggedWidgetArticle->getStableRev();
if ( $flaggedWidgetArticleRevision ) {
$widgetCode = $flaggedWidgetArticleRevision->getRevText();
} else {
$widgetCode = '';
}
} else {
$widgetArticle = new Article( $widgetTitle, 0 );
$widgetCode = $widgetArticle->getContent();
}
// Remove <noinclude> sections and <includeonly> tags from form definition
$widgetCode = StringUtils::delimiterReplace( '<noinclude>', '</noinclude>', '', $widgetCode );
$widgetCode = strtr( $widgetCode, array( '<includeonly>' => '', '</includeonly>' => '' ) );
return true;
} else {
return false;
}
}
public static function wiki_get_timestamp( $widgetName, &$widgetTimestamp, $smarty_obj ) {
$widgetTitle = Title::newFromText( $widgetName, NS_WIDGET );
if ( $widgetTitle && $widgetTitle->exists() ) {
$widgetArticle = new Article( $widgetTitle, 0 );
$widgetTimestamp = $widgetArticle->getTouched();
return true;
} else {
return false;
}
}
public static function wiki_get_secure( $tpl_name, &$smarty_obj ) {
// assume all templates are secure
return true;
}
public static function wiki_get_trusted( $tpl_name, &$smarty_obj ) {
// not used for templates
}
}
|
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