function view($usecache = true)
{
global $wgUser, $wgOut;
$fname = 'NewsFeedPage::view';
wfDebug("{$fname}: start\n");
$note = '';
$ims = @$_SERVER['HTTP_IF_MODIFIED_SINCE'];
//TODO: cache control!
if ($ims && $usecache) {
$lastchange = wfTimestamp(TS_UNIX, NewsRenderer::getLastChangeTime());
wfDebug("{$fname}: checking cache-ok: IMS {$ims} vs. changed {$lastchange} \n");
if ($wgOut->checkLastModified($lastchange)) {
wfDebug("{$fname}: HTTP cache ok, 304 header sent \n");
return;
// done, 304 header sent.
}
}
//NOTE: do caching for anon users only, because of user-specific
// rendering of textual content
if ($wgUser->isAnon() && $usecache) {
$cachekey = $this->getCacheKey();
$ocache = wfGetParserCacheStorage();
$e = $ocache ? $ocache->get($cachekey) : null;
$note .= ' anon;';
$debug = $e ? "got cached" : "no cached";
wfDebug("{$fname}: ({$debug}) \n");
} else {
if (!$usecache) {
wfDebug("{$fname}: purge, ignoring cache \n");
$note .= ' purged;';
} else {
wfDebug("{$fname}: logged in, ignoring cache \n");
$note .= ' user;';
}
$cachekey = null;
$ocache = null;
$e = null;
$note .= ' user;';
}
$wgOut->disable();
if ($e) {
if (!isset($lastchange)) {
$lastchange = wfTimestamp(TS_UNIX, NewsRenderer::getLastChangeTime());
}
$last = wfTimestamp(TS_UNIX, $lastchange);
if ($last < $e['timestamp']) {
wfDebug("{$fname}: outputting cached copy ({$cacheKey}): {$last} < " . $e['timestamp'] . " \n");
header('Content-Type: application/' . $this->mFeedFormat . '+xml; charset=UTF-8');
print $e['xml'];
print "\n<!-- cached: {$note} -->\n";
return;
//done
} else {
wfDebug("{$fname}: found stale cached copy ({$cacheKey}): {$last} <= " . $e['timestamp'] . " \n");
$note .= " stale: {$last} >= {$e['timestamp']};";
}
}
//TODO: fetch actual news data and check the newest item. re-apply cache checks.
// this would still save the cost of rendering if the data didn't change
global $wgParser;
//evil global
$wgParser->startExternalParse($this->mTitle, new ParserOptions(), Parser::OT_HTML, true);
//FIXME: an EXTREMELY ugly hack to force generation of absolute links.
// this is needed because Title::getLocalUrl check wgRequest to see
// if absolute urls are requested, instead of it being a parser option.
$_REQUEST['action'] = 'render';
$renderer = NewsRenderer::newFromArticle($this, $wgParser);
if (!$renderer) {
wfDebug("{$fname}: no feed found on page: " . $this->mTitle->getPrefixedText() . "\n");
wfHttpError(404, "Not Found", "no feed found on page: " . $this->mTitle->getPrefixedText());
//TODO: better code & text
return;
}
$description = '';
//TODO: grab from article content... but what? and how?
$ts = time();
//this also sends the right headers
$xml = $renderer->renderFeed($this->mFeedFormat, $description);
wfDebug("{$fname}: rendered feed \n");
$e = array('xml' => $xml, 'timestamp' => $ts);
if ($ocache) {
wfDebug("{$fname}: caching feed ({$cachekey}) \n");
$ocache->set($cachekey, $e, $ts + 24 * 60 * 60);
//cache for max 24 hours; cached record is discarded when anything turns up in RC anyway.
$note .= ' updated;';
}
wfDebug("{$fname}: outputting fresh feed \n");
header('Content-Type: application/' . $this->mFeedFormat . '+xml; charset=UTF-8');
print $xml;
print "\n<!-- fresh: {$note} -->\n";
}
function wfNewsSkinTemplateOutputPageBeforeExec($skin, $tpl)
{
$feeds = $tpl->data['feeds'];
if (!$feeds) {
return true;
}
$title = $skin->getTitle();
//hack...
foreach ($feeds as $format => $e) {
$e['href'] = NewsRenderer::getFeedURL($title, $format);
$feeds[$format] = $e;
}
$tpl->setRef('feeds', $feeds);
return true;
}
