some work on network discovery
This commit is contained in:
friendica
@@ -337,101 +337,6 @@ function convert_xml_element_to_array($xml_element, &$recursion_depth=0) {
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}
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}
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// Given an email style address, perform webfinger lookup and
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// return the resulting DFRN profile URL, or if no DFRN profile URL
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// is located, returns an OStatus subscription template (prefixed
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// with the string 'stat:' to identify it as on OStatus template).
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// If this isn't an email style address just return $s.
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// Return an empty string if email-style addresses but webfinger fails,
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// or if the resultant personal XRD doesn't contain a supported
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// subscription/friend-request attribute.
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// amended 7/9/2011 to return an hcard which could save potentially loading
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// a lengthy content page to scrape dfrn attributes
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function webfinger_dfrn($s,&$hcard) {
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if(! strstr($s,'@')) {
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return $s;
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}
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$profile_link = '';
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$links = webfinger($s);
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logger('webfinger_dfrn: ' . $s . ':' . print_r($links,true), LOGGER_DATA);
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if(count($links)) {
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foreach($links as $link) {
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if($link['@attributes']['rel'] === NAMESPACE_DFRN)
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$profile_link = $link['@attributes']['href'];
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if($link['@attributes']['rel'] === NAMESPACE_OSTATUSSUB)
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$profile_link = 'stat:' . $link['@attributes']['template'];
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if($link['@attributes']['rel'] === 'http://microformats.org/profile/hcard')
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$hcard = $link['@attributes']['href'];
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}
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}
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return $profile_link;
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}
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// Given an email style address, perform webfinger lookup and
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// return the array of link attributes from the personal XRD file.
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// On error/failure return an empty array.
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function webfinger($s, $debug = false) {
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$host = '';
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if(strstr($s,'@')) {
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$host = substr($s,strpos($s,'@') + 1);
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}
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if(strlen($host)) {
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$tpl = fetch_lrdd_template($host);
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logger('webfinger: lrdd template: ' . $tpl);
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if(strlen($tpl)) {
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$pxrd = str_replace('{uri}', urlencode('acct:' . $s), $tpl);
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logger('webfinger: pxrd: ' . $pxrd);
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$links = fetch_xrd_links($pxrd);
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if(! count($links)) {
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// try with double slashes
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$pxrd = str_replace('{uri}', urlencode('acct://' . $s), $tpl);
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logger('webfinger: pxrd: ' . $pxrd);
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$links = fetch_xrd_links($pxrd);
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}
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return $links;
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}
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}
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return array();
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}
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// Given a host name, locate the LRDD template from that
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// host. Returns the LRDD template or an empty string on
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// error/failure.
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function fetch_lrdd_template($host) {
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$tpl = '';
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$url1 = 'https://' . $host . '/.well-known/host-meta' ;
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$url2 = 'http://' . $host . '/.well-known/host-meta' ;
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$links = fetch_xrd_links($url1);
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logger('fetch_lrdd_template from: ' . $url1);
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logger('template (https): ' . print_r($links,true));
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if(! count($links)) {
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logger('fetch_lrdd_template from: ' . $url2);
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$links = fetch_xrd_links($url2);
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logger('template (http): ' . print_r($links,true));
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}
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if(count($links)) {
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foreach($links as $link)
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if($link['@attributes']['rel'] && $link['@attributes']['rel'] === 'lrdd')
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$tpl = $link['@attributes']['template'];
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}
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if(! strpos($tpl,'{uri}'))
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$tpl = '';
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return $tpl;
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}
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// Take a URL from the wild, prepend http:// if necessary
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// and check DNS to see if it's real (or check if is a valid IP address)
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// return true if it's OK, false if something is wrong with it
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@@ -912,3 +817,152 @@ function email_send($addr, $subject, $headers, $item) {
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logger('notifier: email delivery to ' . $addr);
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mail($addr, $subject, $body, $headers);
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}
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function discover_by_webbie($webbie) {
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$x = webfinger_rfc7033($webbie);
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if($x && array_key_exists('links',$x) && $x['links']) {
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foreach($x['links'] as $link) {
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if(array_key_exists('rel',$link) && $link['rel'] == 'http://purl.org/zot/protocol') {
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logger('discover_by_webbie: zot found for ' . $webbie);
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$z = z_fetch_url($link['href']);
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if($z['success']) {
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$j = json_decode($z['body'],true);
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$i = import_xchan($j);
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return true;
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}
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}
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}
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}
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$x = old_webfinger($webbie);
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if($x) {
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logger('old_webfinger: ' . print_r($x,true));
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}
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}
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function webfinger_rfc7033($webbie) {
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if(! strpos($webbie,'@'))
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return false;
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$lhs = substr($webbie,0,strpos($webbie,'@'));
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$rhs = substr($webbie,strpos($webbie,'@')+1);
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$resource = 'acct:' . $webbie;
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$s = z_fetch_url('https://' . $rhs . '/.well-known/webfinger?resource=' . $resource);
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if($s['success'])
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$j = json_decode($s['body'],true);
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else
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return false;
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return($j);
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}
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function old_webfinger($webbie) {
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$host = '';
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if(strstr($webbie,'@'))
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$host = substr($webbie,strpos($webbie,'@') + 1);
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if(strlen($host)) {
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$tpl = fetch_lrdd_template($host);
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logger('old_webfinger: lrdd template: ' . $tpl,LOGGER_DATA);
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if(strlen($tpl)) {
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$pxrd = str_replace('{uri}', urlencode('acct:' . $webbie), $tpl);
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logger('old_webfinger: pxrd: ' . $pxrd,LOGGER_DATA);
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$links = fetch_xrd_links($pxrd);
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if(! count($links)) {
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// try with double slashes
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$pxrd = str_replace('{uri}', urlencode('acct://' . $webbie), $tpl);
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logger('old_webfinger: pxrd: ' . $pxrd,LOGGER_DATA);
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$links = fetch_xrd_links($pxrd);
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}
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return $links;
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}
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}
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return array();
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}
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function fetch_lrdd_template($host) {
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$tpl = '';
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$url1 = 'https://' . $host . '/.well-known/host-meta' ;
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$url2 = 'http://' . $host . '/.well-known/host-meta' ;
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$links = fetch_xrd_links($url1);
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logger('fetch_lrdd_template from: ' . $url1, LOGGER_DEBUG);
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logger('template (https): ' . print_r($links,true),LOGGER_DEBUG);
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if(! count($links)) {
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logger('fetch_lrdd_template from: ' . $url2);
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$links = fetch_xrd_links($url2);
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logger('template (http): ' . print_r($links,true),LOGGER_DEBUG);
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}
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if(count($links)) {
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foreach($links as $link)
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if($link['@attributes']['rel'] && $link['@attributes']['rel'] === 'lrdd' && (!$link['@attributes']['type'] || $link['@attributes']['type'] === 'application/xrd+xml'))
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$tpl = $link['@attributes']['template'];
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}
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if(! strpos($tpl,'{uri}'))
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$tpl = '';
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return $tpl;
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}
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function fetch_xrd_links($url) {
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logger('fetch_xrd_links: ' . $url);
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$redirects = 0;
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$x = z_fetch_url($url,false,$redirects,array('timeout' => 20));
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if(! $x['success'])
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return array();
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$xml = $x['body'];
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logger('fetch_xrd_links: ' . $xml, LOGGER_DATA);
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if ((! $xml) || (! stristr($xml,'<xrd')))
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return array();
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// fix diaspora's bad xml
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$xml = str_replace(array('href="','"/>'),array('href="','"/>'),$xml);
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$h = parse_xml_string($xml);
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if(! $h)
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return array();
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$arr = convert_xml_element_to_array($h);
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$links = array();
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if(isset($arr['xrd']['link'])) {
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$link = $arr['xrd']['link'];
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if(! isset($link[0]))
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$links = array($link);
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else
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$links = $link;
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}
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if(isset($arr['xrd']['alias'])) {
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$alias = $arr['xrd']['alias'];
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if(! isset($alias[0]))
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$aliases = array($alias);
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else
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$aliases = $alias;
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if(is_array($aliases) && count($aliases)) {
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foreach($aliases as $alias) {
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$links[]['@attributes'] = array('rel' => 'alias' , 'href' => $alias);
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}
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}
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}
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logger('fetch_xrd_links: ' . print_r($links,true), LOGGER_DATA);
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return $links;
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}
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