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authorEvan Prodromou <evan@controlyourself.ca>2009-03-11 19:42:53 -0400
committerEvan Prodromou <evan@controlyourself.ca>2009-03-11 19:42:53 -0400
commitdfd9e318599a527e2b8ad9b3374143cfcdd02fda (patch)
treea50ca9664692f72c41c1ad3f7b92a728bd098caa /plugins/LinkbackPlugin.php
parent70d5fc46845804507640e354c9d9e06367a53fb0 (diff)
Add initial trackback support
Diffstat (limited to 'plugins/LinkbackPlugin.php')
-rw-r--r--plugins/LinkbackPlugin.php95
1 files changed, 89 insertions, 6 deletions
diff --git a/plugins/LinkbackPlugin.php b/plugins/LinkbackPlugin.php
index 77adfa87d..1b5365100 100644
--- a/plugins/LinkbackPlugin.php
+++ b/plugins/LinkbackPlugin.php
@@ -94,18 +94,25 @@ class LinkbackPlugin extends Plugin
return $orig;
}
+ $pb = null;
+ $tb = null;
+
if (array_key_exists('X-Pingback', $result->headers)) {
- $endpoint = $result->headers['X-Pingback'];
+ $pb = $result->headers['X-Pingback'];
} else if (preg_match('/<link rel="pingback" href="([^"]+)" ?/?>/',
$result->body,
$match)) {
- $endpoint = $match[1];
- } else {
- // XXX: do Trackback lookup
- return $orig;
+ $pb = $match[1];
+ }
+
+ $tb = $this->getTrackback($result->body, $result->final_url);
+
+ if (!empty($tb)) {
+ $this->trackback($result->final_url, $tb);
+ } else if (!empty($pb)) {
+ $this->pingback($result->final_url, $pb);
}
- $this->pingback($url, $endpoint);
return $orig;
}
@@ -132,6 +139,82 @@ class LinkbackPlugin extends Plugin
}
}
+ // Largely cadged from trackback_cls.php by
+ // Ran Aroussi <ran@blogish.org>, GPL2
+ // http://phptrackback.sourceforge.net/
+
+ function getTrackback($text, $url)
+ {
+ if (preg_match_all('/(<rdf:RDF.*?<\/rdf:RDF>)/sm', $text, $match, PREG_SET_ORDER)) {
+ for ($i = 0; $i < count($match); $i++) {
+ if (preg_match('|dc:identifier="' . preg_quote($url) . '"|ms', $match[$i][1])) {
+ $rdf_array[] = trim($match[$i][1]);
+ }
+ }
+
+ // Loop through the RDFs array and extract trackback URIs
+
+ $tb_array = array(); // <- holds list of trackback URIs
+
+ if (!empty($rdf_array)) {
+
+ for ($i = 0; $i < count($rdf_array); $i++) {
+ if (preg_match('/trackback:ping="([^"]+)"/', $rdf_array[$i], $array)) {
+ $tb_array[] = trim($array[1]);
+ break;
+ }
+ }
+ }
+
+ // Return Trackbacks
+
+ if (empty($tb_array)) {
+ return null;
+ } else {
+ return $tb_array[0];
+ }
+ }
+
+ if (preg_match_all('/(<a[^>]*?rel=[\'"]trackback[\'"][^>]*?>)/', $text, $match)) {
+ foreach ($match[1] as $atag) {
+ if (preg_match('/href=[\'"]([^\'"]*?)[\'"]/', $atag, $url)) {
+ return $url[1];
+ }
+ }
+ }
+
+ return null;
+
+ }
+
+ function trackback($url, $endpoint)
+ {
+ $profile = $this->notice->getProfile();
+
+ $args = array('title' => sprintf(_('%1$s\'s status on %2$s'),
+ $profile->nickname,
+ common_exact_date($this->notice->created)),
+ 'excerpt' => $this->notice->content,
+ 'url' => $this->notice->uri,
+ 'blog_name' => $profile->nickname);
+
+ $fetcher = Auth_Yadis_Yadis::getHTTPFetcher();
+
+ $result = $fetcher->post($endpoint,
+ http_build_query($args),
+ array('User-Agent: ' . $this->userAgent()));
+
+ if ($result->status != '200') {
+ common_log(LOG_WARNING,
+ "Trackback error for '$url' ($endpoint): ".
+ "$result->body");
+ } else {
+ common_log(LOG_INFO,
+ "Trackback success for '$url' ($endpoint): ".
+ "'$result->body'");
+ }
+ }
+
function userAgent()
{
return 'LinkbackPlugin/'.LINKBACKPLUGIN_VERSION .