Changeset 2438 for branches/schema06/system/classes/acl.php

Timestamp:

09/04/08 03:47:39 (4 months ago)

Author:

bjohnson

Message:

schema06: Initial go at re-writing ACL class to work with new permission schema.

Files:

• branches/schema06/system/classes/acl.php (modified) (11 diffs)

branches/schema06/system/classes/acl.php

@@ -44 +44 @@
         }
         Plugins::act('permission_create_before', $name, $description);
-        $result= DB::query('INSERT INTO {permissions} (name, description) VALUES (?, ?)', array( $name, $description) );
+        $result= DB::query('INSERT INTO {tokens} (name, description) VALUES (?, ?)', array( $name, $description) );
+
         if ( ! $result ) {
             // if it didn't work, don't bother trying to log it
@@ -66 +67 @@
         }
 
-        // Use ids internall for permissions
-        $permission= ACL::permission_id( $permission );
-
-        $allow= true;
+        // grab permission ID
+        $permission = ACL::permission_id( $permission );
+
+        $allow = true;
         // plugins have the opportunity to prevent deletion
-        $allow= Plugins::filter('permission_destroy_allow', $allow, $permission);
+        $allow = Plugins::filter('permission_destroy_allow', $allow, $permission);
         if ( ! $allow ) {
             return false;
@@ -77 +78 @@
         Plugins::act('permission_destroy_before', $permission );
         // capture the permission name
-        $name= DB::get_value( 'SELECT name FROM {permissions} WHERE id=?', array( $permission ) );
+        $name = DB::get_value( 'SELECT name FROM {tokens} WHERE id=?', array( $permission ) );
         // remove all references to this permissions
-        $result= DB::query( 'DELETE FROM {groups_permissions} WHERE permission_id=?', array( $permission ) );
+        $result = DB::query( 'DELETE FROM {group_token_permissions} WHERE permission_id=?', array( $permission ) );
+        $result = DB::query( 'DELETE FROM {user_token_permissions} WHERE permission_id=?', array( $permission ) );
         // remove this permission
-        $result= DB::query( 'DELETE FROM {permissions} WHERE permissions_id=?', array( $permission ) );
+        $result = DB::query( 'DELETE FROM {tokens} WHERE id=?', array( $permission ) );
         if ( ! $result ) {
             // if it didn't work, don't bother trying to log it
@@ -102 +104 @@
             $order= 'id';
         }
-        $permissions= DB::get_results( 'SELECT id, name, description FROM {permissions} ORDER BY ' . $order );
+        $permissions= DB::get_results( 'SELECT id, name, description FROM {tokens} ORDER BY ' . $order );
         return $permissions ? $permissions : array();
     }
@@ -116 +118 @@
             return false;
         } else {
-            return DB::get_value( 'SELECT name FROM {permissions} WHERE id=?', array( $id ) );
+            return DB::get_value( 'SELECT name FROM {tokens} WHERE id=?', array( $id ) );
         }
     }
@@ -131 +133 @@
         }
         $name= self::normalize_permission( $name );
-        return DB::get_value( 'SELECT id FROM {permissions} WHERE name=?', array( $name ) );
+        return DB::get_value( 'SELECT id FROM {tokens} WHERE name=?', array( $name ) );
     }
 
@@ -147 +149 @@
             $permission= self::normalize_permission( $permission );
         }
-        return DB::get_value( "SELECT description FROM {permissions} WHERE $query=?", array( $permission ) );
+        return DB::get_value( "SELECT description FROM {tokens} WHERE $query=?", array( $permission ) );
     }
 
@@ -164 +166 @@
             $permission= self::normalize_permission( $permission );
         }
-        return ( DB::get_value( "SELECT COUNT(id) FROM {permissions} WHERE $query=?", array( $permission ) ) > 0 );
+        return ( DB::get_value( "SELECT COUNT(id) FROM {tokens} WHERE $query=?", array( $permission ) ) > 0 );
     }
 
@@ -193 +195 @@
      * @param mixed $group A group ID or name
      * @param mixed $permission An action ID or name
+     * @param string $access Check for 'read', 'write', or 'full' access
      * @return bool Whether the group can perform the action
     **/
-    public static function group_can( $group, $permission )
+    public static function group_can( $group, $permission, $access = 'full' )
     {
         // Use only numeric ids internally
-        $group= UserGroup::id( $group );
-        $permission= ACL::permission_id( $permission );
-        $result= DB::get_value( 'SELECT denied FROM {groups_permissions} WHERE permission_id=? AND group_id=?', array( $permission, $group ) );
-        if ( 0 === intval($result) ) {
+        $group = UserGroup::id( $group );
+        $permission = ACL::permission_id( $permission );
+        $sql = <<<SQL
+SELECT p.name FROM {group_token_permissions} gp, {permissions} p WHERE
+gp.group_id=? AND gp.token_id=? AND gp.permission_id=p.id;
+SQL;
+        $result = DB::get_values( $sql );
+        if ( $result == $access ) {
             // the permission has been granted to this group
             return true;
@@ -214 +221 @@
      * @param mixed $user A user object, user ID or a username
      * @param mixed $permission A permission ID or name
+     * @param string $access Check for 'read', 'write', or 'full' access
      * @return bool Whether the user can perform the action
     **/
-    public static function user_can( $user, $permission )
+    public static function user_can( $user, $permission, $access = 'full' )
     {
         // Use only numeric ids internally
@@ -232 +240 @@
         }
 
-        // we select the "denied" value from all the permissions
-        // assigned to all the groups to which this user is a member.
-        // array_unique() should consolidate this down to, at most,
-        // two values: 0 and 1.
-        $permissions= DB::get_column('SELECT gp.denied from {groups_permissions} gp, {users_groups} g where gp.group_id = g.group_id and g.user_id=? and permission_id=?', array( $user_id, $permission ) );
-
-        // if any group is explicitly denied access to this permission,
-        // this user is denied access to that permission
-        if ( in_array( 1, $permissions ) ) {
-            return false;
-        }
-        // if the permission is not explicitly denied, make sure it's
-        // explicitly granted.  If it is, the user can do this.
-        if ( in_array( 0, $permissions, true ) ) {
+        /**
+         * Jay Pipe's explanation of the following SQL
+         * 1) Look into user_permissions for the user and the token.  
+         * If exists, use that permission flag for the check. If not, 
+         * go to 2)
+         *
+         * 2) Look into the group_permissions joined to 
+         * users_groups for the user and the token.  Order the results 
+         * by the permission_id flag. The lower the flag value, the 
+         * fewest permissions that group has. Use the first record's 
+         * permission flag to check the ACL.
+         *
+         * This gives the system very fine grained control and grabbing 
+         * the permission flag and can be accomplished in a single SQL 
+         * call.
+         */ 
+        $sql = <<<SQL
+SELECT COALESCE(permission_id, 0) as permission_id
+FROM (
+(
+  SELECT permission_id
+  FROM {user_token_permissions}
+  WHERE user_id = :user_id
+  AND token_id = :token_id
+) AS up
+UNION ALL
+(
+  SELECT gp.permission_id
+  FROM {users_groups} ug
+  INNER JOIN {group_token_permissions} gp
+  ON ug.group_id = gp.group_id
+  AND ug.user_id = :user_id
+  AND gp.token_id = :token_id
+  ORDER BY permission_id ASC
+  LIMIT 1
+)
+)
+LIMIT 1; 
+SQL;
+        $result = DB::get_value( $sql, array( ':user_id' => $user_id, ':token_id' => $permission );
+
+        // TODO: modify above call to return the permission name rather than the ID
+        // For now, I'll just look for a result > 0
+        if ( $result !== FALSE && intval($result) > 0 ) {
             return true;
         }
+
         // if the permission is neither denied nor granted, they're not
         // allowed to do it.