cache result of (expensive) security check for visitor rights

begin tightening x-profile security

include/security.php

@@ -2,15 +2,27 @@
 
 function can_write_wall(&$a,$owner) {
 
-        if((! (local_user())) && (! (remote_user())))
+	static $verified = 0;
-                return false;
-		$uid = local_user();
 
-        if(($uid) && ($uid == $owner)) {
+	if((! (local_user())) && (! (remote_user())))
-                return true;
+		return false;
-		}
 
-		if(remote_user()) {
+	$uid = local_user();
+
+	if(($uid) && ($uid == $owner)) {
+		return true;
+	}
+
+	if(remote_user()) {
+
+		// user remembered decision and avoid a DB lookup for each and every display item
+		// DO NOT use this function if there are going to be multiple owners
+
+		if($verified === 2)
+			return true;
+		elseif($verified === 1)
+			return false;
+		else {
 			$r = q("SELECT `contact`.*, `user`.`page-flags` FROM `contact` LEFT JOIN `user` on `user`.`uid` = `contact`.`uid` 
 				WHERE `contact`.`uid` = %d AND `contact`.`id` = %d AND `contact`.`blocked` = 0 AND `contact`.`pending` = 0 
 				AND `readonly` = 0  AND ( `contact`.`rel` IN ( %d , %d ) OR `user`.`page-flags` = %d ) LIMIT 1",
@@ -20,11 +32,15 @@ function can_write_wall(&$a,$owner) {
 				intval(REL_BUD),
 				intval(PAGE_COMMUNITY)
 			);
+			if(count($r)) {
+				$verified = 2;
+				return true;
+			}
+			else {
+				$verified = 1;
+			}
 		}
-		if(count($r))
+	}
-			return true;
-
-		
-        return false;
 
+	return false;
 }

mod/dfrn_poll.php

@@ -10,6 +10,7 @@ function dfrn_poll_init(&$a) {
 	$type            = ((x($_GET,'type'))            ? $_GET['type']                 : '');
 	$last_update     = ((x($_GET,'last_update'))     ? $_GET['last_update']          : '');
 	$destination_url = ((x($_GET,'destination_url')) ? $_GET['destination_url']      : '');
+	$sec             = ((x($_GET,'sec'))             ? intval($_GET['sec'])          : 0);
 	$dfrn_version    = ((x($_GET,'dfrn_version'))    ? (float) $_GET['dfrn_version'] : 0);
 
 
@@ -212,18 +213,11 @@ function dfrn_poll_post(&$a) {
 
 function dfrn_poll_content(&$a) {
 
-
+	$dfrn_id      = ((x($_GET,'dfrn_id'))      ? $_GET['dfrn_id']              : '');
-	$dfrn_id = '';
+	$type         = ((x($_GET,'type'))         ? $_GET['type']                 : 'data');
-	$type = 'data';
+	$last_update  = ((x($_GET,'last_update'))  ? $_GET['last_update']          : '');
-
+	$dfrn_version = ((x($_GET,'dfrn_version')) ? (float) $_GET['dfrn_version'] : 2.0);
-	if(x($_GET,'dfrn_id'))
+	$sec          = ((x($_GET,'sec'))          ? intval($_GET['sec'])          : 0);
-		$dfrn_id = $_GET['dfrn_id'];
-	if(x($_GET,'type'))
-		$type = $_GET['type'];
-	if(x($_GET,'last_update'))
-		$last_update = $_GET['last_update'];
-
-	$dfrn_version = (float) $_GET['dfrn_version'];
 
 	$direction = (-1);
 	if(strpos($dfrn_id,':') == 1) {
@@ -249,7 +243,6 @@ function dfrn_poll_content(&$a) {
 			dbesc($last_update)
 		);
 
-
 		$sql_extra = '';
 		switch($direction) {
 			case (-1):
@@ -269,9 +262,6 @@ function dfrn_poll_content(&$a) {
 				break; // NOTREACHED
 		}
 
-
-
-
 		$r = q("SELECT * FROM `contact` WHERE `blocked` = 0 AND `pending` = 0 $sql_extra LIMIT 1");
 
 		if(count($r)) {
@@ -296,10 +286,11 @@ function dfrn_poll_content(&$a) {
 		else {
 			$status = 1;
 		}
+
 		header("Content-type: text/xml");
 		echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n"
 			. '<dfrn_poll>' . "\r\n"
-			. "\t" . '<status>' .$status . '</status>' . "\r\n"
+			. "\t" . '<status>' . $status . '</status>' . "\r\n"
 			. "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
 			. "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n"
 			. "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"

mod/redir.php

@@ -27,6 +27,6 @@ function redir_init(&$a) {
 		dbesc($dfrn_id),
 		intval(time() + 45));
 	goaway ($r[0]['poll'] . '?dfrn_id=' . $dfrn_id 
-		. '&dfrn_version=' . DFRN_PROTOCOL_VERSION . '&type=profile');
+		. '&dfrn_version=' . DFRN_PROTOCOL_VERSION . '&type=profile&sec=1');
 	
 }