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<?php
/*
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2010, StatusNet, Inc.
*
* Some utilities for generating hint data
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
class DiscoveryHints {
static function fromXRD($xrd)
{
$hints = array();
foreach ($xrd->links as $link) {
switch ($link['rel']) {
case Discovery::PROFILEPAGE:
$hints['profileurl'] = $link['href'];
break;
case Salmon::NS_REPLIES:
$hints['salmon'] = $link['href'];
break;
case Discovery::UPDATESFROM:
$hints['feedurl'] = $link['href'];
break;
case Discovery::HCARD:
$hints['hcardurl'] = $link['href'];
break;
default:
break;
}
}
return $hints;
}
static function fromHcardUrl($url)
{
$client = new HTTPClient();
$client->setHeader('Accept', 'text/html,application/xhtml+xml');
$response = $client->get($url);
if (!$response->isOk()) {
return null;
}
return self::hcardHints($response->getBody(),
$response->getUrl());
}
static function hcardHints($body, $url)
{
common_debug("starting tidy");
$body = self::_tidy($body, $url);
common_debug("done with tidy");
set_include_path(get_include_path() . PATH_SEPARATOR . INSTALLDIR . '/plugins/OStatus/extlib/hkit/');
require_once('hkit.class.php');
// hKit code is not clean for notices and warnings
$old = error_reporting();
error_reporting($old & ~E_NOTICE & ~E_WARNING);
$h = new hKit;
$hcards = $h->getByString('hcard', $body);
error_reporting($old);
if (empty($hcards)) {
return array();
}
if (count($hcards) == 1) {
$hcard = $hcards[0];
} else {
foreach ($hcards as $try) {
if (array_key_exists('url', $try)) {
if (is_string($try['url']) && $try['url'] == $url) {
$hcard = $try;
break;
} else if (is_array($try['url'])) {
foreach ($try['url'] as $tryurl) {
if ($tryurl == $url) {
$hcard = $try;
break 2;
}
}
}
}
}
// last chance; grab the first one
if (empty($hcard)) {
$hcard = $hcards[0];
}
}
$hints = array();
if (array_key_exists('nickname', $hcard)) {
$hints['nickname'] = $hcard['nickname'];
}
if (array_key_exists('fn', $hcard)) {
$hints['fullname'] = $hcard['fn'];
} else if (array_key_exists('n', $hcard)) {
$hints['fullname'] = implode(' ', $hcard['n']);
}
if (array_key_exists('photo', $hcard)) {
$hints['avatar'] = $hcard['photo'];
}
if (array_key_exists('note', $hcard)) {
$hints['bio'] = $hcard['note'];
}
if (array_key_exists('adr', $hcard)) {
if (is_string($hcard['adr'])) {
$hints['location'] = $hcard['adr'];
} else if (is_array($hcard['adr'])) {
$hints['location'] = implode(' ', $hcard['adr']);
}
}
if (array_key_exists('url', $hcard)) {
if (is_string($hcard['url'])) {
$hints['homepage'] = $hcard['url'];
} else if (is_array($hcard['url'])) {
// HACK get the last one; that's how our hcards look
$hints['homepage'] = $hcard['url'][count($hcard['url'])-1];
}
}
return $hints;
}
/**
* hKit needs well-formed XML for its parsing.
* We'll take the HTML body here and normalize it to XML.
*
* @param string $body HTML document source, possibly not-well-formed
* @param string $url source URL
* @return string well-formed XML document source
* @throws Exception if HTML parsing failed.
*/
private static function _tidy($body, $url)
{
if (empty($body)) {
throw new Exception("Empty HTML could not be parsed.");
}
$dom = new DOMDocument();
// Some HTML errors will trigger warnings, but still work.
$old = error_reporting();
error_reporting($old & ~E_WARNING);
$ok = $dom->loadHTML($body);
error_reporting($old);
if ($ok) {
// If the original had xmlns or xml:lang attributes on the
// <html>, we seen to end up with duplicates, which causes
// parse errors. Remove em!
//
// For some reason we have to iterate and remove them twice,
// *plus* they don't show up on hasAttribute() or removeAttribute().
// This might be some weird bug in PHP or libxml2, uncertain if
// it affects other folks consistently.
$root = $dom->documentElement;
foreach ($root->attributes as $i => $x) {
if ($i == 'xmlns' || $i == 'xml:lang') {
$root->removeAttributeNode($x);
}
}
foreach ($root->attributes as $i => $x) {
if ($i == 'xmlns' || $i == 'xml:lang') {
$root->removeAttributeNode($x);
}
}
// hKit doesn't give us a chance to pass the source URL for
// resolving relative links, such as the avatar photo on a
// Google profile. We'll slip it into a <base> tag if there's
// not already one present.
$bases = $dom->getElementsByTagName('base');
if ($bases && $bases->length >= 1) {
$base = $bases->item(0);
if ($base->hasAttribute('href')) {
$base->setAttribute('href', $url);
}
} else {
$base = $dom->createElement('base');
$base->setAttribute('href', $url);
$heads = $dom->getElementsByTagName('head');
if ($heads || $heads->length) {
$head = $heads->item(0);
} else {
$head = $dom->createElement('head');
if ($root->firstChild) {
$root->insertBefore($head, $root->firstChild);
} else {
$root->appendChild($head);
}
}
$head->appendChild($base);
}
return $dom->saveXML();
} else {
throw new Exception("Invalid HTML could not be parsed.");
}
}
}
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