From d5dd8200b9463188f3a258902188b39a8ccbcd11 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc=20W=C3=A4ckerlin?= <marc@mrw.sh>
Date: Wed, 4 Nov 2015 15:48:54 +0000
Subject: [PATCH] added foreign key to database

---
 html/messagetable.php |  6 +++---
 html/safechat.js      | 11 ++++++++++-
 html/usertable.php    |  4 ++--
 3 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/html/messagetable.php b/html/messagetable.php
index 15159de..49aeb24 100644
--- a/html/messagetable.php
+++ b/html/messagetable.php
@@ -12,9 +12,9 @@
     <table>
     <caption>Table: message</caption>
     <tr><th>Colum Name</th><th>SQL Type</th><th>Description</th></tr>
-    <tr><td>id</td><td>int</td><td>Incrementing message id starting at 1.</td></tr>
+    <tr><td>id</td><td>int, primary key</td><td>Incrementing message id starting at 1.</td></tr>
     <tr><td>time</td><td>timestamp</td><td>Time when message has been stored in the database.</td></tr>
-    <tr><td>user</td><td>varchar(50)</td><td>The sender's user name (pseudonym).</td></tr>
+    <tr><td>user</td><td>varchar(50), references \ref usertable "user (name)"</td><td>The sender's user name (pseudonym).</td></tr>
     <tr><td>msg</td><td>longtext</td><td>The encryped and armored message text.</td></tr>
     </table>
 */
@@ -23,7 +23,7 @@
 
 require_once("opendb.php");
 try {
-  $db->query('create table if not exists message (id int primary key not null auto_increment, time timestamp default current_timestamp, user varchar(50) not null, msg longtext not null);');
+  $db->query('create table if not exists message (id int primary key not null auto_increment, time timestamp default current_timestamp, user varchar(50) not null, msg longtext not null, foreign key (user) references user(name) on delete cascade on update cascade) character set utf8 engine=innodb;');
   $db->query('set global max_allowed_packet=1000000000');
   $db->query('set global net_buffer_length=1000000');
 } catch (Exception $e) {
diff --git a/html/safechat.js b/html/safechat.js
index 5640964..3ea08c1 100644
--- a/html/safechat.js
+++ b/html/safechat.js
@@ -686,4 +686,13 @@ function start() {
 }
 
 /// On Load, Call @ref start
-$(start);
+$(
+    window.onbeforeunload = function() {
+        return "Are you sure you want to navigate away?";
+    }
+    window.onunload = function () { // you probably don't want to leave now...
+        alert('You are trying to leave.');
+        return false;
+    }
+    start();
+);
diff --git a/html/usertable.php b/html/usertable.php
index 25c89c7..b106044 100644
--- a/html/usertable.php
+++ b/html/usertable.php
@@ -14,7 +14,7 @@
     <table>
     <caption>Table: user</caption>
     <tr><th>Colum Name</th><th>SQL Type</th><th>Description</th></tr>
-    <tr><td>name</td><td>varchar(50)</td><td>The user's name (pseudonym).</td></tr>
+    <tr><td>name</td><td>varchar(50), primary key</td><td>The user's name (pseudonym).</td></tr>
     <tr><td>pubkey</td><td>text</td><td>The user's public key.</td></tr>
     </table>
 
@@ -24,7 +24,7 @@
 
 require_once("opendb.php");
 try {
-  $db->query('create table if not exists user (name varchar(50) not null unique key, pubkey text not null);');
+  $db->query('create table if not exists user (name varchar(50) not null primary key, pubkey text not null) character set utf8 engine=innodb;');
 } catch (Exception $e) {
   error('database error on server');
 }