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<?php
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/**
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 * Validates a URI as defined by RFC 3986.
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 * @note Scheme-specific mechanics deferred to HTMLPurifier_URIScheme
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 */
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class HTMLPurifier_AttrDef_URI extends HTMLPurifier_AttrDef
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{
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    /**
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     * @type HTMLPurifier_URIParser
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     */
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    protected $parser;
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    /**
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     * @type bool
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     */
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    protected $embedsResource;
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    /**
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     * @param bool $embeds_resource Does the URI here result in an extra HTTP request?
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     */
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    public function __construct($embeds_resource = false)
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    {
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        $this->parser = new HTMLPurifier_URIParser();
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        $this->embedsResource = (bool)$embeds_resource;
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    }
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    /**
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     * @param string $string
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     * @return HTMLPurifier_AttrDef_URI
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     */
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    public function make($string)
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    {
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        $embeds = ($string === 'embedded');
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        return new HTMLPurifier_AttrDef_URI($embeds);
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    }
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    /**
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     * @param string $uri
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     * @param HTMLPurifier_Config $config
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     * @param HTMLPurifier_Context $context
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     * @return bool|string
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     */
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    public function validate($uri, $config, $context)
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    {
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        if ($config->get('URI.Disable')) {
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            return false;
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        }
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        $uri = $this->parseCDATA($uri);
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        // parse the URI
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        $uri = $this->parser->parse($uri);
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        if ($uri === false) {
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            return false;
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        }
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        // add embedded flag to context for validators
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        $context->register('EmbeddedURI', $this->embedsResource);
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        $ok = false;
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        do {
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            // generic validation
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            $result = $uri->validate($config, $context);
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            if (!$result) {
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                break;
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            }
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            // chained filtering
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            $uri_def = $config->getDefinition('URI');
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            $result = $uri_def->filter($uri, $config, $context);
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            if (!$result) {
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                break;
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            }
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            // scheme-specific validation
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            $scheme_obj = $uri->getSchemeObj($config, $context);
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            if (!$scheme_obj) {
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                break;
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            }
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            if ($this->embedsResource && !$scheme_obj->browsable) {
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                break;
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            }
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            $result = $scheme_obj->validate($uri, $config, $context);
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            if (!$result) {
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                break;
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            }
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            // Post chained filtering
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            $result = $uri_def->postFilter($uri, $config, $context);
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            if (!$result) {
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                break;
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            }
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            // survived gauntlet
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            $ok = true;
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        } while (false);
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        $context->destroy('EmbeddedURI');
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        if (!$ok) {
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            return false;
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        }
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        // back to string
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        return $uri->toString();
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    }
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}
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// vim: et sw=4 sts=4