split off facebook and other cron hooks from poller

[friendica.git] / include / security.php

diff --git a/include/security.php b/include/security.php
index 2ff26ff74eafee39b100cf38392caf7eb0f73110..6fbdd697f797158af297d57019e9bb3298a35161 100644 (file)
--- a/include/security.php
+++ b/include/security.php
@@ -2,26 +2,116 @@
 
 function can_write_wall(&$a,$owner) {
 
-        if((! (local_user())) && (! (remote_user())))
-                return false;
-               $uid = get_uid();
+       static $verified = 0;
 
-        if(($uid) && ($uid == $owner)) {
-                return true;
-               }
+       if((! (local_user())) && (! (remote_user())))
+               return false;
+
+       $uid = local_user();
+
+       if(($uid) && ($uid == $owner)) {
+               return true;
+       }
 
-        $r = q("SELECT `contact`.*, `user`.`page-flags` FROM `contact` LEFT JOIN `user` on `user`.`uid` = `contact`.`uid` 
-                       WHERE `contact`.`uid` = %d AND `contact`.`id` = %d AND `contact`.`blocked` = 0 AND `contact`.`pending` = 0 
-                       AND `readonly` = 0  AND ( `contact`.`rel` IN ( %d , %d ) OR `user`.`page-flags` = %d ) LIMIT 1",
-                       intval($owner),
-                       intval($_SESSION['visitor_id']),
-                       intval(REL_VIP),
-                       intval(REL_BUD),
-                       intval(PAGE_COMMUNITY)
-        );
+       if(remote_user()) {
 
-        if(count($r))
-                return true;
-        return false;
+               // user remembered decision and avoid a DB lookup for each and every display item
+               // DO NOT use this function if there are going to be multiple owners
+
+               if($verified === 2)
+                       return true;
+               elseif($verified === 1)
+                       return false;
+               else {
+                       $r = q("SELECT `contact`.*, `user`.`page-flags` FROM `contact` LEFT JOIN `user` on `user`.`uid` = `contact`.`uid` 
+                               WHERE `contact`.`uid` = %d AND `contact`.`id` = %d AND `contact`.`blocked` = 0 AND `contact`.`pending` = 0 
+                               AND `user`.`blockwall` = 0 AND `readonly` = 0  AND ( `contact`.`rel` IN ( %d , %d ) OR `user`.`page-flags` = %d ) LIMIT 1",
+                               intval($owner),
+                               intval(remote_user()),
+                               intval(CONTACT_IS_FOLLOWER),
+                               intval(CONTACT_IS_FRIEND),
+                               intval(PAGE_COMMUNITY)
+                       );
+                       if(count($r)) {
+                               $verified = 2;
+                               return true;
+                       }
+                       else {
+                               $verified = 1;
+                       }
+               }
+       }
 
+       return false;
 }
+
+
+function permissions_sql($owner_id,$remote_verified = false,$groups = null) {
+
+       $local_user = local_user();
+       $remote_user = remote_user();
+
+       /**
+        * Construct permissions
+        *
+        * default permissions - anonymous user
+        */
+
+       $sql = " AND allow_cid = '' 
+                        AND allow_gid = '' 
+                        AND deny_cid  = '' 
+                        AND deny_gid  = '' 
+       ";
+
+       /**
+        * Profile owner - everything is visible
+        */
+
+       if(($local_user) && ($local_user == $owner_id)) {
+               $sql = ''; 
+       }
+
+       /**
+        * Authenticated visitor. Unless pre-verified, 
+        * check that the contact belongs to this $owner_id
+        * and load the groups the visitor belongs to.
+        * If pre-verified, the caller is expected to have already
+        * done this and passed the groups into this function.
+        */
+
+       elseif($remote_user) {
+
+               if(! $remote_verified) {
+                       $r = q("SELECT id FROM contact WHERE id = %d AND uid = %d AND blocked = 0 LIMIT 1",
+                               intval($remote_user),
+                               intval($owner_id)
+                       );
+                       if(count($r)) {
+                               $remote_verified = true;
+                               $groups = init_groups_visitor($remote_user);
+                       }
+               }
+               if($remote_verified) {
+               
+                       $gs = '<<>>'; // should be impossible to match
+
+                       if(is_array($groups) && count($groups)) {
+                               foreach($groups as $g)
+                                       $gs .= '|<' . intval($g) . '>';
+                       } 
+
+                       $sql = sprintf(
+                               " AND ( allow_cid = '' OR allow_cid REGEXP '<%d>' ) 
+                                 AND ( deny_cid  = '' OR  NOT deny_cid REGEXP '<%d>' ) 
+                                 AND ( allow_gid = '' OR allow_gid REGEXP '%s' )
+                                 AND ( deny_gid  = '' OR NOT deny_gid REGEXP '%s') 
+                               ",
+                               intval($remote_user),
+                               intval($remote_user),
+                               dbesc($gs),
+                               dbesc($gs)
+                       );
+               }
+       }
+       return $sql;
+}
\ No newline at end of file