<?php
class HTMLPurifier_URIDefinition extends HTMLPurifier_Definition {
	public $type = 'URI';
	protected $filters = array ();
	protected $postFilters = array ();
	protected $registeredFilters = array ();
	
	/**
	 * HTMLPurifier_URI object of the base specified at %URI.Base
	 */
	public $base;
	
	/**
	 * String host to consider "home" base, derived off of $base
	 */
	public $host;
	
	/**
	 * Name of default scheme based on %URI.DefaultScheme and %URI.Base
	 */
	public $defaultScheme;
	public function __construct() {
		$this->registerFilter ( new HTMLPurifier_URIFilter_DisableExternal () );
		$this->registerFilter ( new HTMLPurifier_URIFilter_DisableExternalResources () );
		$this->registerFilter ( new HTMLPurifier_URIFilter_DisableResources () );
		$this->registerFilter ( new HTMLPurifier_URIFilter_HostBlacklist () );
		$this->registerFilter ( new HTMLPurifier_URIFilter_SafeIframe () );
		$this->registerFilter ( new HTMLPurifier_URIFilter_MakeAbsolute () );
		$this->registerFilter ( new HTMLPurifier_URIFilter_Munge () );
	}
	public function registerFilter($filter) {
		$this->registeredFilters [$filter->name] = $filter;
	}
	public function addFilter($filter, $config) {
		$r = $filter->prepare ( $config );
		if ($r === false)
			return; // null is ok, for backwards compat
		if ($filter->post) {
			$this->postFilters [$filter->name] = $filter;
		} else {
			$this->filters [$filter->name] = $filter;
		}
	}
	protected function doSetup($config) {
		$this->setupMemberVariables ( $config );
		$this->setupFilters ( $config );
	}
	protected function setupFilters($config) {
		foreach ( $this->registeredFilters as $name => $filter ) {
			if ($filter->always_load) {
				$this->addFilter ( $filter, $config );
			} else {
				$conf = $config->get ( 'URI.' . $name );
				if ($conf !== false && $conf !== null) {
					$this->addFilter ( $filter, $config );
				}
			}
		}
		unset ( $this->registeredFilters );
	}
	protected function setupMemberVariables($config) {
		$this->host = $config->get ( 'URI.Host' );
		$base_uri = $config->get ( 'URI.Base' );
		if (! is_null ( $base_uri )) {
			$parser = new HTMLPurifier_URIParser ();
			$this->base = $parser->parse ( $base_uri );
			$this->defaultScheme = $this->base->scheme;
			if (is_null ( $this->host ))
				$this->host = $this->base->host;
		}
		if (is_null ( $this->defaultScheme ))
			$this->defaultScheme = $config->get ( 'URI.DefaultScheme' );
	}
	public function getDefaultScheme($config, $context) {
		return HTMLPurifier_URISchemeRegistry::instance ()->getScheme ( $this->defaultScheme, $config, $context );
	}
	public function filter(&$uri, $config, $context) {
		foreach ( $this->filters as $name => $f ) {
			$result = $f->filter ( $uri, $config, $context );
			if (! $result)
				return false;
		}
		return true;
	}
	public function postFilter(&$uri, $config, $context) {
		foreach ( $this->postFilters as $name => $f ) {
			$result = $f->filter ( $uri, $config, $context );
			if (! $result)
				return false;
		}
		return true;
	}
}

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