From 36bfab86c2682c460b197029bbae4daa6ff83ec4 Mon Sep 17 00:00:00 2001
From: Andrew Dolgov <fox@madoka.spb.ru>
Date: Thu, 2 Mar 2006 09:10:43 +0100
Subject: [PATCH] database backed sessions

---
 backend.php                          |  4 +-
 db-prefs.php                         |  4 +-
 login.php                            |  2 +-
 logout.php                           |  2 +-
 opml.php                             |  2 +-
 prefs.php                            |  2 +-
 schema/ttrss_schema_mysql.sql        |  8 +++
 schema/ttrss_schema_pgsql.sql        |  9 +++
 schema/upgrade-1.1.3-1.1.4-mysql.sql |  7 +++
 schema/upgrade-1.1.3-1.1.4-pgsql.sql |  8 +++
 sessions.php                         | 92 ++++++++++++++++++++++++++++
 stats.php                            |  2 +-
 tt-rss.php                           |  2 +-
 utils/xml-export.php                 |  2 +-
 utils/xml-import.php                 |  4 +-
 15 files changed, 137 insertions(+), 13 deletions(-)
 create mode 100644 sessions.php

diff --git a/backend.php b/backend.php
index 2fd8fe22d..c5ce040ca 100644
--- a/backend.php
+++ b/backend.php
@@ -1,6 +1,6 @@
 <?
-	session_start();
-
+	require_once "sessions.php";
+	
 	header("Cache-Control: no-cache, must-revalidate");
 	header("Pragma: no-cache");
 	header("Expires: -1");
diff --git a/db-prefs.php b/db-prefs.php
index 80d890fbc..8714e340c 100644
--- a/db-prefs.php
+++ b/db-prefs.php
@@ -3,8 +3,8 @@
 	require_once "db.php";
 
 	if (! DISABLE_SESSIONS) {	
-		session_start();
-		
+		require_once "sessions.php";
+	
 		if (!$_SESSION["prefs_cache"])
 			$_SESSION["prefs_cache"] = array();
 	}
diff --git a/login.php b/login.php
index eda2ac826..bfdce9a6d 100644
--- a/login.php
+++ b/login.php
@@ -1,5 +1,5 @@
 <?
-	session_start();
+	require_once "sessions.php";
 
 	require_once "sanity_check.php";
 	require_once "version.php"; 
diff --git a/logout.php b/logout.php
index b258067a6..056cc025d 100644
--- a/logout.php
+++ b/logout.php
@@ -1,5 +1,5 @@
 <?
-	session_start();
+	require_once "sessions.php";
 
 	require_once "config.php";
 	require_once "functions.php";
diff --git a/opml.php b/opml.php
index 23a282776..492a8b8cb 100644
--- a/opml.php
+++ b/opml.php
@@ -1,5 +1,5 @@
 <?
-	session_start();
+	require_once "sessions.php";
 
 	require_once "sanity_check.php";
 	require_once "functions.php";
diff --git a/prefs.php b/prefs.php
index 988367861..7dd81e2bf 100644
--- a/prefs.php
+++ b/prefs.php
@@ -1,5 +1,5 @@
 <?
-	session_start();
+	require_once "sessions.php";
 
 	require_once "sanity_check.php";
 	require_once "version.php"; 
diff --git a/schema/ttrss_schema_mysql.sql b/schema/ttrss_schema_mysql.sql
index eb1076999..5032334c8 100644
--- a/schema/ttrss_schema_mysql.sql
+++ b/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;
diff --git a/schema/ttrss_schema_pgsql.sql b/schema/ttrss_schema_pgsql.sql
index 97434ce2a..ec98bbb22 100644
--- a/schema/ttrss_schema_pgsql.sql
+++ b/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;
diff --git a/schema/upgrade-1.1.3-1.1.4-mysql.sql b/schema/upgrade-1.1.3-1.1.4-mysql.sql
index 2570bb4ba..f2e9bd16c 100644
--- a/schema/upgrade-1.1.3-1.1.4-mysql.sql
+++ b/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;
 
diff --git a/schema/upgrade-1.1.3-1.1.4-pgsql.sql b/schema/upgrade-1.1.3-1.1.4-pgsql.sql
index 92025c4af..6a0f46b55 100644
--- a/schema/upgrade-1.1.3-1.1.4-pgsql.sql
+++ b/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;
diff --git a/sessions.php b/sessions.php
new file mode 100644
index 000000000..dddab5012
--- /dev/null
+++ b/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();
+?>
diff --git a/stats.php b/stats.php
index d56389eca..007053b18 100644
--- a/stats.php
+++ b/stats.php
@@ -1,5 +1,5 @@
 <?
-	session_start();
+	require_once "sessions.php";
 
 	require_once "sanity_check.php";
 	require_once "version.php"; 
diff --git a/tt-rss.php b/tt-rss.php
index 82ba8a895..9d125614d 100644
--- a/tt-rss.php
+++ b/tt-rss.php
@@ -1,5 +1,5 @@
 <?
-	session_start();
+	require_once "sessions.php";
 
 	require_once "sanity_check.php";
 	require_once "version.php"; 
diff --git a/utils/xml-export.php b/utils/xml-export.php
index a10c9e3de..438f008d4 100644
--- a/utils/xml-export.php
+++ b/utils/xml-export.php
@@ -1,5 +1,5 @@
 <?
-	session_start();
+	require_once "sessions.php";
 
 	define('MAX_SCHEMA_VERSION', 5);
 
diff --git a/utils/xml-import.php b/utils/xml-import.php
index aeccd77e4..0706b0fa2 100644
--- a/utils/xml-import.php
+++ b/utils/xml-import.php
@@ -1,6 +1,6 @@
 <?
-	session_start();
-
+	require_once "sessions.php";
+	
 	require_once "config.php";
 	require_once "functions.php";
 	require_once "db.php";