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<?php
#%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%#
# Application initialization [Thomas Lange <code@nerdmind.de>] #
#%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%#
# #
# This file brings the application up! #
# #
#%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%#
#===============================================================================
# Document root
#===============================================================================
define('ROOT', dirname(__DIR__).'/');
#===============================================================================
# Autoload register for classes
#===============================================================================
spl_autoload_register(function($classname) {
$classname = str_replace('\\', '/', $classname);
require_once "namespace/{$classname}.php";
});
#===============================================================================
# Exception handler for non-caught exceptions
#===============================================================================
set_exception_handler(function($Exception) {
http_response_code(503);
exit($Exception->getMessage());
});
#===============================================================================
# Initialize HTTP class and remove all arrays from $_GET and $_POST
#===============================================================================
HTTP::init($_GET, $_POST, $_FILES, TRUE);
#===============================================================================
# Include configuration
#===============================================================================
require_once 'configuration.php';
#===============================================================================
# Overwrite configuration if admin
#===============================================================================
if(defined('ADMINISTRATION') AND ADMINISTRATION === TRUE) {
#===========================================================================
# Enable sessions
#===========================================================================
session_start();
#===========================================================================
# Authentication check
#===========================================================================
if(defined('AUTHENTICATION') AND !Application::isAuthenticated()) {
HTTP::redirect(Application::getAdminURL('auth.php'));
}
#===========================================================================
# Overwrite configuration
#===========================================================================
Application::set('CORE.LANGUAGE', Application::get('ADMIN.LANGUAGE'));
Application::set('TEMPLATE.NAME', Application::get('ADMIN.TEMPLATE'));
Application::set('TEMPLATE.LANG', Application::get('ADMIN.LANGUAGE'));
}
#===============================================================================
# Include functions
#===============================================================================
require_once 'functions.php';
#===============================================================================
# TRY: PDOException
#===============================================================================
try {
$Language = Application::getLanguage();
$Database = Application::getDatabase();
$Database->setAttribute($Database::ATTR_DEFAULT_FETCH_MODE, $Database::FETCH_OBJ);
$Database->setAttribute($Database::ATTR_ERRMODE, $Database::ERRMODE_EXCEPTION);
}
#===============================================================================
# CATCH: PDOException
#===============================================================================
catch(PDOException $Exception) {
http_response_code(503);
exit("PDO database connection error: {$Exception->getMessage()}");
}
#===============================================================================
# Check if "304 Not Modified" and ETag header should be send
#===============================================================================
if(Application::get('CORE.SEND_304') === TRUE AND !defined('ADMINISTRATION')) {
#===========================================================================
# Select edit time from last edited items (page, post, user)
#===========================================================================
$execute = 'SELECT time_update FROM %s ORDER BY time_update DESC LIMIT 1';
$PageStatement = $Database->query(sprintf($execute, Page\Attribute::TABLE));
$PostStatement = $Database->query(sprintf($execute, Post\Attribute::TABLE));
$UserStatement = $Database->query(sprintf($execute, User\Attribute::TABLE));
#===========================================================================
# Define HTTP ETag header identifier
#===========================================================================
$HTTP_ETAG_IDENTIFIER = sha1(implode(NULL, [
serialize(Application::getConfiguration()),
$PageStatement->fetchColumn(),
$PostStatement->fetchColumn(),
$UserStatement->fetchColumn(),
'CUSTOM-STRING-0123456789'
]));
#===========================================================================
# Send ETag header within the HTTP response
#===========================================================================
HTTP::responseHeader(HTTP::HEADER_ETAG, "\"{$HTTP_ETAG_IDENTIFIER}\"");
#===========================================================================
# Validate ETag header from the HTTP request
#===========================================================================
if(isset($_SERVER['HTTP_IF_NONE_MATCH'])) {
$HTTP_IF_NONE_MATCH = $_SERVER['HTTP_IF_NONE_MATCH'];
$HTTP_IF_NONE_MATCH = trim($HTTP_IF_NONE_MATCH, '"');
# If the server adds the extensions to the response header
$HTTP_IF_NONE_MATCH = rtrim($HTTP_IF_NONE_MATCH, '-br');
$HTTP_IF_NONE_MATCH = rtrim($HTTP_IF_NONE_MATCH, '-gzip');
if($HTTP_IF_NONE_MATCH === $HTTP_ETAG_IDENTIFIER) {
http_response_code(304);
exit();
}
}
}
?>
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