X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=mod%2Fpubsubhubbub.php;h=11fbf2cf5f3af52f7bc4919fbbb68e7776bc6178;hb=a16e8d97f6c2935d5a5e136362a698580db4c64a;hp=ea27f048223af99477dbee5cf51b3306997ed84a;hpb=14fde5dc9b1915392601fb94efc6224c01f2b216;p=friendica.git

diff --git a/mod/pubsubhubbub.php b/mod/pubsubhubbub.php
index ea27f04822..11fbf2cf5f 100644
--- a/mod/pubsubhubbub.php
+++ b/mod/pubsubhubbub.php
@@ -7,9 +7,10 @@ use Friendica\Core\System;
 use Friendica\Database\DBA;
 use Friendica\Model\PushSubscriber;
 use Friendica\Util\Network;
+use Friendica\Util\Strings;
 
 function post_var($name) {
-	return (x($_POST, $name)) ? notags(trim($_POST[$name])) : '';
+	return !empty($_POST[$name]) ? Strings::escapeTags(trim($_POST[$name])) : '';
 }
 
 function pubsubhubbub_init(App $a) {
@@ -49,13 +50,15 @@ function pubsubhubbub_init(App $a) {
 
 		Logger::log("$hub_mode request from " . $_SERVER['REMOTE_ADDR']);
 
-		// get the nick name from the topic, a bit hacky but needed as a fallback
-		$nick = substr(strrchr($hub_topic, "/"), 1);
-
-		// Normally the url should now contain the nick name as last part of the url
 		if ($a->argc > 1) {
+			// Normally the url should now contain the nick name as last part of the url
 			$nick = $a->argv[1];
+		} else {
+			// Get the nick name from the topic as a fallback
+			$nick = $hub_topic;
 		}
+		// Extract nick name and strip any .atom extension
+		$nick = basename($nick, '.atom');
 
 		if (!$nick) {
 			Logger::log('Bad hub_topic=$hub_topic, ignoring.');
@@ -64,7 +67,7 @@ function pubsubhubbub_init(App $a) {
 
 		// fetch user from database given the nickname
 		$condition = ['nickname' => $nick, 'account_expired' => false, 'account_removed' => false];
-		$owner = DBA::selectFirst('user', ['uid', 'hidewall'], $condition);
+		$owner = DBA::selectFirst('user', ['uid', 'hidewall', 'nickname'], $condition);
 		if (!DBA::isResult($owner)) {
 			Logger::log('Local account not found: ' . $nick . ' - topic: ' . $hub_topic . ' - callback: ' . $hub_callback);
 			System::httpExit(404);
@@ -87,25 +90,32 @@ function pubsubhubbub_init(App $a) {
 
 		// sanity check that topic URLs are the same
 		$hub_topic2 = str_replace('/feed/', '/dfrn_poll/', $hub_topic);
-		if (!link_compare($hub_topic, $contact['poll']) && !link_compare($hub_topic2, $contact['poll'])) {
+		$self = System::baseUrl() . '/api/statuses/user_timeline/' . $owner['nickname'] . '.atom';
+
+		if (!Strings::compareLink($hub_topic, $contact['poll']) && !Strings::compareLink($hub_topic2, $contact['poll']) && !Strings::compareLink($hub_topic, $self)) {
 			Logger::log('Hub topic ' . $hub_topic . ' != ' . $contact['poll']);
 			System::httpExit(404);
 		}
 
 		// do subscriber verification according to the PuSH protocol
-		$hub_challenge = random_string(40);
-		$params = 'hub.mode=' .
-			($subscribe == 1 ? 'subscribe' : 'unsubscribe') .
-			'&hub.topic=' . urlencode($hub_topic) .
-			'&hub.challenge=' . $hub_challenge .
-			'&hub.lease_seconds=604800' .
-			'&hub.verify_token=' . $hub_verify_token;
-
-		// lease time is hard coded to one week (in seconds)
-		// we don't actually enforce the lease time because GNU
-		// Social/StatusNet doesn't honour it (yet)
-
-		$fetchResult = Network::fetchUrlFull($hub_callback . "?" . $params);
+		$hub_challenge = Strings::getRandomHex(40);
+
+		$params = http_build_query([
+			'hub.mode' => $subscribe == 1 ? 'subscribe' : 'unsubscribe',
+			'hub.topic' => $hub_topic,
+			'hub.challenge' => $hub_challenge,
+			'hub.verify_token' => $hub_verify_token,
+
+			// lease time is hard coded to one week (in seconds)
+			// we don't actually enforce the lease time because GNU
+			// Social/StatusNet doesn't honour it (yet)
+			'hub.lease_seconds' => 604800,
+		]);
+
+		$hub_callback = rtrim($hub_callback, ' ?&#');
+		$separator = parse_url($hub_callback, PHP_URL_QUERY) === null ? '?' : '&';
+
+		$fetchResult = Network::fetchUrlFull($hub_callback . $separator . $params);
 		$body = $fetchResult->getBody();
 		$ret = $fetchResult->getReturnCode();