database backed sessions

backend.php

@@ -1,5 +1,5 @@
 <?
-	session_start();
+	require_once "sessions.php";
 	
 	header("Cache-Control: no-cache, must-revalidate");
 	header("Pragma: no-cache");

db-prefs.php

@@ -3,7 +3,7 @@
 	require_once "db.php";
 
 	if (! DISABLE_SESSIONS) {	
-		session_start();
+		require_once "sessions.php";
 	
 		if (!$_SESSION["prefs_cache"])
 			$_SESSION["prefs_cache"] = array();

login.php

@@ -1,5 +1,5 @@
 <?
-	session_start();
+	require_once "sessions.php";
 
 	require_once "sanity_check.php";
 	require_once "version.php"; 

logout.php

@@ -1,5 +1,5 @@
 <?
-	session_start();
+	require_once "sessions.php";
 
 	require_once "config.php";
 	require_once "functions.php";

opml.php

@@ -1,5 +1,5 @@
 <?
-	session_start();
+	require_once "sessions.php";
 
 	require_once "sanity_check.php";
 	require_once "functions.php";

prefs.php

@@ -1,5 +1,5 @@
 <?
-	session_start();
+	require_once "sessions.php";
 
 	require_once "sanity_check.php";
 	require_once "version.php"; 

schema/ttrss_schema_mysql.sql

@@ -16,6 +16,7 @@ drop table if exists ttrss_feeds;
 drop table if exists ttrss_feed_categories;
 drop table if exists ttrss_users;
 drop table if exists ttrss_themes;
+drop table if exists ttrss_sessions;
 
 begin;
 
@@ -255,4 +256,11 @@ create table ttrss_scheduled_updates (id integer not null primary key auto_incre
 	foreign key (owner_uid) references ttrss_users(id) ON DELETE CASCADE,
 	foreign key (feed_id) references ttrss_feeds(id) ON DELETE CASCADE) TYPE=InnoDB;
 
+create table ttrss_sessions (int_id integer not null primary key auto_increment,
+	id varchar(300) unique not null,
+	data text,
+	expire integer not null,
+	index (id), 
+	index (expire)) TYPE=InnoDB;
+
 commit;

schema/ttrss_schema_pgsql.sql

@@ -16,6 +16,7 @@ drop table ttrss_feeds;
 drop table ttrss_feed_categories;
 drop table ttrss_users;
 drop table ttrss_themes;
+drop table ttrss_sessions;
 
 begin;
 
@@ -230,4 +231,12 @@ create table ttrss_scheduled_updates (id serial not null primary key,
 	feed_id integer default null references ttrss_feeds(id) ON DELETE CASCADE,
 	entered timestamp not null default NOW());
 
+create table ttrss_sessions (int_id serial not null primary key,
+		id varchar(300) unique not null,
+		data text,
+		expire integer not null);
+
+create index ttrss_sessions_id_index on ttrss_sessions(id);
+create index ttrss_sessions_expire_index on ttrss_sessions(expire);
+
 commit;

schema/upgrade-1.1.3-1.1.4-mysql.sql

@@ -5,5 +5,12 @@ update ttrss_entries set author = '';
 alter table ttrss_entries change author author varchar(250) not null;
 alter table ttrss_entries alter column author set default '';
 
+create table ttrss_sessions (int_id integer not null primary key auto_increment,
+	id varchar(300) unique not null,
+	data text,
+	expire integer not null,
+	index (id), 
+	index (expire)) TYPE=InnoDB;
+
 update ttrss_version set schema_version = 6;
 

schema/upgrade-1.1.3-1.1.4-pgsql.sql

@@ -7,6 +7,14 @@ update ttrss_entries set author = '';
 alter table ttrss_entries alter column author set not null;
 alter table ttrss_entries alter column author set default '';
 
+create table ttrss_sessions (int_id serial not null primary key,
+		id varchar(300) unique not null,
+		data text,
+		expire integer not null);
+
+create index ttrss_sessions_id_index on ttrss_sessions(id);
+create index ttrss_sessions_expire_index on ttrss_sessions(expire);
+
 update ttrss_version set schema_version = 6;
 
 commit;

sessions.php

@@ -0,0 +1,92 @@
+<?
+	// Original from http://www.daniweb.com/code/snippet43.html
+
+	require_once "config.php";
+	require_once "db.php";
+
+	$session_expire = 600;
+
+	ini_set("session.gc_probability", 50);
+
+	function open ($s, $n) {
+	
+		global $session_connection;
+		
+		$session_connection = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
+		
+		return true;
+	}
+
+	function read ($id){
+	
+		global $session_connection,$session_read;					 
+
+		$query = "SELECT data FROM ttrss_sessions WHERE id='$id'";
+
+		$res = db_query($session_connection, $query);
+		
+		if (db_num_rows($res) != 1) {
+		 	return "";
+		} else {
+			$session_read = db_fetch_assoc($res);
+			$session_read["data"] = base64_decode($session_read["data"]);
+			return $session_read["data"];
+		}
+	}
+
+	function write ($id, $data) {
+ 
+		if (! $data) { 
+			return false; 
+		}
+		
+		global $session_connection, $session_read, $session_expire;
+		
+		$expire = time() + $session_expire;
+		
+		$data = db_escape_string(base64_encode($data), $session_connection);
+		
+		if ($session_read) {
+		 	$query = "UPDATE ttrss_sessions SET data='$data', 
+					expire='$expire' WHERE id='$id'"; 
+		} else {
+		 	$query = "INSERT INTO ttrss_sessions (id, data, expire)
+					VALUES ('$id', '$data', '$expire')";
+		}
+		
+		db_query($session_connection, $query);
+		return true;
+	}
+
+	function close () {
+	
+		global $session_connection;
+		
+		db_close($session_connection);
+		
+		return true;
+	}
+
+	function destroy ($id) {
+	
+		global $session_connection;
+		
+		$query = "DELETE FROM ttrss_sessions WHERE id = '$id'";
+		
+		db_query($session_connection, $query);
+		
+		return true;
+	}
+
+	function gc ($expire) {
+	
+		global $session_connection;
+		
+		$query = "DELETE FROM ttrss_sessions WHERE expire < " . time();
+		
+		db_query($session_connection, $query);
+	}
+
+	session_set_save_handler ("open", "close", "read", "write", "destroy", "gc");
+	session_start();
+?>

stats.php

@@ -1,5 +1,5 @@
 <?
-	session_start();
+	require_once "sessions.php";
 
 	require_once "sanity_check.php";
 	require_once "version.php"; 

tt-rss.php

@@ -1,5 +1,5 @@
 <?
-	session_start();
+	require_once "sessions.php";
 
 	require_once "sanity_check.php";
 	require_once "version.php"; 

utils/xml-export.php

@@ -1,5 +1,5 @@
 <?
-	session_start();
+	require_once "sessions.php";
 
 	define('MAX_SCHEMA_VERSION', 5);
 

utils/xml-import.php

@@ -1,5 +1,5 @@
 <?
-	session_start();
+	require_once "sessions.php";
 	
 	require_once "config.php";
 	require_once "functions.php";