Index: install.php
===================================================================
--- install.php	(revision 14858)
+++ install.php	(working copy)
@@ -68,14 +68,15 @@
 		 * @var Array
 		 */
 		var $steps = Array (
-			'fresh_install'		=>	Array ('check_paths', 'db_config', 'select_license', /*'download_license',*/ 'select_domain', 'root_password', 'choose_modules', 'post_config', 'sys_config', 'select_theme', 'security', 'finish'),
-			'clean_reinstall'	=>	Array ('check_paths', 'clean_db', 'db_config', 'select_license', /*'download_license',*/ 'select_domain', 'root_password', 'choose_modules', 'post_config', 'sys_config', 'select_theme', 'security', 'finish'),
+			'fresh_install'		=>	Array ('sys_requirements', 'check_paths', 'db_config', 'select_license', /*'download_license',*/ 'select_domain', 'root_password', 'choose_modules', 'post_config', 'sys_config', 'select_theme', 'security', 'finish'),
+			'clean_reinstall'	=>	Array ('initial', 'sys_requirements', 'check_paths', 'clean_db', 'db_config', 'select_license', /*'download_license',*/ 'select_domain', 'root_password', 'choose_modules', 'post_config', 'sys_config', 'select_theme', 'security', 'finish'),
 			'already_installed'	=>	Array ('check_paths', 'install_setup'),
 
 			'upgrade'			=>	Array ('check_paths', 'install_setup', 'upgrade_modules', 'skin_upgrade', 'security', 'finish'),
 			'update_license'	=>	Array ('check_paths', 'install_setup', 'select_license', /*'download_license',*/ 'select_domain', 'security', 'finish'),
 			'update_config'		=>	Array ('check_paths', 'install_setup', 'sys_config', 'security', 'finish'),
 			'db_reconfig'		=>	Array ('check_paths', 'install_setup', 'db_reconfig', 'security', 'finish'),
+			'sys_requirements'	=>	Array ('check_paths', 'install_setup', 'sys_requirements', 'security', 'finish')
 		);
 
 		/**
@@ -83,14 +84,14 @@
 		 *
 		 * @var Array
 		 */
-		var $skipLoginSteps = Array ('check_paths', 'select_license', /*'download_license',*/ 'select_domain', 'root_password', 'choose_modules', 'post_config', 'select_theme', 'security', 'finish', -1);
+		var $skipLoginSteps = Array ('sys_requirements', 'check_paths', 'select_license', /*'download_license',*/ 'select_domain', 'root_password', 'choose_modules', 'post_config', 'select_theme', 'security', 'finish', -1);
 
 		/**
 		 * Steps, on which kApplication should not be initialized, because of missing correct db table structure
 		 *
 		 * @var Array
 		 */
-		var $skipApplicationSteps = Array ('check_paths', 'clean_db', 'db_config', 'db_reconfig' /*, 'install_setup'*/); // remove install_setup when application will work separately from install
+		var $skipApplicationSteps = Array ('sys_requirements', 'check_paths', 'clean_db', 'db_config', 'db_reconfig' /*, 'install_setup'*/); // remove install_setup when application will work separately from install
 
 		/**
 		 * Folders that should be writeable to continue installation. $1 - main writeable folder from config.php ("/system" by default)
@@ -198,6 +199,7 @@
 			}
 
 			$this->InitStep();
+
 		}
 
 		function SetFirstStep()
@@ -277,6 +279,14 @@
 			}
 
 			switch ($this->currentStep) {
+				case 'sys_requirements':
+					if (!isset($_POST['errors']) || $_POST['refresh_form'] == 'Refresh') {
+						$this->errorMessage = ' ';
+					}
+					if (isset($_POST['errors']) && $_POST['errors']) {
+						$this->errorMessage = '<br/>Installation can not continue until all required environment parameters are set correctly';
+					}
+					break;
 				case 'check_paths':
 					$writeable_base = $this->toolkit->getSystemConfig('Misc', 'WriteablePath');
 					foreach ($this->writeableFolders as $folder_path) {
@@ -324,6 +334,14 @@
 							$this->toolkit->setSystemConfig('Database', $field_name, '');
 						}*/
 					}
+
+//					if (!isset($_POST['errors']) || $_POST['refresh_form'] == 'Refresh') {
+//						$this->errorMessage = '&nbsp;';
+//					}
+//					if (isset($_POST['errors']) && $_POST['errors']) {
+//						$this->errorMessage = '<br/>Installation can not continue until all required environment parameters are set correctly';
+//					}
+//
 			        break;
 
 				case 'download_license':
@@ -509,6 +527,14 @@
 							break;
 						}
 					}
+
+					// 2. Check DB requirements
+					$db_check_results = $this->toolkit->CallPrerequisitesMethod('core/', 'CheckDBRequirements');
+					if (!$db_check_results['version'] || !$db_check_results['packet_size']) {
+						$status = false;
+						$this->errorMessage = '<br/>Installation can not continue until all required environment parameters are set correctly';
+					}
+
 					if (!$status) break;
 
 					// 2. check permissions, that use have in this database
@@ -1019,11 +1045,11 @@
 				return ;
 			}
 
+			$this->InitApplication();
+
 			$this->currentStep = $this->GetNextStep();
 			$this->InitStep(); // init next step (that will be shown now)
 
-			$this->InitApplication();
-
 			if ($this->currentStep == -1) {
 				// step after last step -> redirect to admin
 				$this->Application->Redirect('index', Array (), '', 'index.php');
@@ -1267,6 +1293,17 @@
 				$this->errorMessage = $error_message;
 			}
 
+			if ($this->currentStep == 'sys_requirements') {
+				if (isset($_REQUEST['cookies']) && $_REQUEST['cookies']) {
+					setcookie('test', $_REQUEST['cookies'], time()+3600);
+				} else {
+					$random_number = rand(1000000, 9999999);
+					setcookie('test', $random_number, time()+3600);
+				    header('Location:'.$_SERVER['PHP_SELF'].'?cookies='.$random_number.'&preset='.$this->stepsPreset.'&step='.$this->currentStep);
+				    exit;
+				}
+			}
+
 			include_once (FULL_PATH . '/' . REL_PATH . '/install/incs/install.tpl');
 
 			if ( isset($this->Application) ) {
@@ -1496,6 +1533,7 @@
 		 */
 		function GetStepBody()
 		{
+
 			$step_template = FULL_PATH.'/core/install/step_templates/'.$this->currentStep.'.tpl';
 			if (file_exists($step_template)) {
 				ob_start();
@@ -1642,6 +1680,9 @@
 			$step_titles = $this->_getStepTitles($this->steps[$this->stepsPreset]);
 
 			foreach ($this->steps[$this->stepsPreset] as $step_name) {
+				if ($step_name == 'initial') {
+					continue;
+				}
 				$template = $step_name == $this->currentStep ? $active_tpl : $passive_tpl;
 				$ret .= sprintf($template, $step_titles[$step_name]);
 			}
@@ -1691,7 +1732,7 @@
 		{
 			$button_visibility = Array (
 				'continue' => $this->GetNextStep() != -1 || ($this->stepsPreset == 'already_installed'),
-				'refresh' => in_array($this->currentStep, Array ('check_paths', 'security')),
+				'refresh' => in_array($this->currentStep, Array ('check_paths', 'security', 'sys_requirements')),
 				'back' => in_array($this->currentStep, Array (/*'select_license',*/ 'download_license', 'select_domain')),
 			);
 
@@ -1707,4 +1748,39 @@
 
 			return array_key_exists($name, $button_visibility) ? $button_visibility[$name] : true;
 		}
+
+		function PrintDBRequirements()
+		{
+			$heading_tpl = '
+				<tr class="subsectiontitle">
+					<td class="text" colspan="2" style="border-top: 1px solid #000000; border-bottom: 1px solid #000000;">%s</td>
+				</tr>';
+
+			$error_tpl = '
+				<tr class="table-color2">
+					<td class="text">%s</td>
+				  	<td align="center" width="30">%s</td>
+				</tr>';
+
+			$check_results = $this->toolkit->CallPrerequisitesMethod('core/', 'CheckDBRequirements');
+
+			$output = sprintf($heading_tpl, '<strong>Server-side requirements</strong>');
+
+			$checks = Array (
+				'version' => 'MySQL version: 5.0+ (required)',
+				'packet_size' => 'MySQL Packet Size: 1MB min (required)',
+			);
+
+			foreach ($checks AS $key => $label) {
+				$error = '';
+				if (isset($check_results[$key])) {
+					$error = $check_results[$key] ? '[<span style="color:green;">PASSED</span>]' : '[<span class="error">FAILED</span>]';
+				}
+				$output .= sprintf($error_tpl, $label, $error);
+			}
+
+			$output .= sprintf($heading_tpl, '<strong>Database configuration</strong>', 'text');
+
+			echo $output;
+		}
 	}
Index: install/install_toolkit.php
===================================================================
--- install/install_toolkit.php	(revision 14858)
+++ install/install_toolkit.php	(working copy)
@@ -159,6 +159,40 @@
 		}
 
 		/**
+		 * Call prerequisites method
+		 *
+		 * @param string $module_path
+		 * @param string $method
+		 * @return array
+		 */
+		function CallPrerequisitesMethod($module_path, $method)
+		{
+			static $prerequisit_classes = Array ();
+
+			$prerequisites_file = sprintf(PREREQUISITE_FILE, $module_path);
+			if ( !file_exists($prerequisites_file)) {
+				return Array ();
+			}
+
+			if ( !isset($prerequisit_classes[$module_path]) ) {
+				// save class name, because 2nd time
+				// (in after call $prerequisite_class variable will not be present)
+				include_once $prerequisites_file;
+				$prerequisit_classes[$module_path] = $prerequisite_class;
+			}
+
+			$prerequisite_object = new $prerequisit_classes[$module_path]();
+			/* @var $prerequisite_object InPortalPrerequisites */
+
+			if ( method_exists($prerequisite_object, 'setToolkit') ) {
+				$prerequisite_object->setToolkit($this);
+			}
+
+			// some errors possible
+			return $prerequisite_object->$method();
+		}
+
+		/**
 		 * Processes one license, received from server
 		 *
 		 * @param string $file_data
Index: install/prerequisites.php
===================================================================
--- install/prerequisites.php	(revision 14858)
+++ install/prerequisites.php	(working copy)
@@ -20,7 +20,7 @@
 	 * Class, that holds all prerequisite scripts for "In-Portal" module
 	 *
 	 */
-	class InPortalPrerequisites extends kHelper {
+	class InPortalPrerequisites {
 
 		/**
 		 * Install toolkit instance
@@ -30,6 +30,14 @@
 		var $_toolkit = null;
 
 		/**
+		* Connection to database
+		*
+		* @var kDBConnection
+		* @access protected
+		*/
+		protected $Conn = null;
+
+		/**
 		 * Sets common instance of installator toolkit
 		 *
 		 * @param kInstallToolkit $instance
@@ -42,6 +50,16 @@
 		/**
 		 * Checks minimal version, that could be upgradeable
 		 *
+		 * @return kDBConnection
+		 */
+		function &getConnection()
+		{
+			return $this->_toolkit->Conn;
+		}
+
+		/**
+		 * Checks minimal version, that could be upgradeable
+		 *
 		 * @param Array $versions
 		 * @param string $mode when called mode {install, upgrade, standalone)
 		 * @return Array
@@ -54,8 +72,10 @@
 				$sql = 'SELECT Version
 						FROM ' . TABLE_PREFIX . 'Modules
 						WHERE Name = "In-Portal"';
-				$inportal_version = $this->Conn->GetOne($sql);
 
+				$conn =& $this->getConnection();
+				$inportal_version = $conn->GetOne($sql);
+
 				if ($inportal_version === false) {
 					// only, when In-Portal was installed
 					return $errors;
@@ -72,4 +92,79 @@
 
 			return $errors;
 		}
+
+		/**
+		 * Returns information about system requirements
+		 *
+		 * @return array
+		 */
+		function CheckSystemRequirements()
+		{
+			// check PHP version 5.2+
+			$ret = Array();
+
+			$version_parts = explode('.', PHP_VERSION);
+			$ret['php_version'] = $version_parts[0] > 5 || ($version_parts[0] == 5 && $version_parts[1] > 1);
+
+			$ret['url_rewriting'] = function_exists('apache_get_modules') && in_array('mod_rewrite',apache_get_modules());
+			$ret['memcache'] = class_exists('Memcache');
+			$ret['curl'] = function_exists('curl_init');
+			$ret['freetype'] = function_exists('imagettfbbox');
+
+			$ret['gd_version'] = 0;
+			$ret['jpeg'] = 0;
+			if (function_exists('gd_info')) {
+				$gd_info = gd_info();
+				preg_match_all('/\d+/', $gd_info['GD Version'], $version_parts);
+				$ret['gd_version'] = $version_parts[0][0] > 1 || ($version_parts[0][0] == 1 && $version_parts[0][1] > 7);
+				$ret['jpeg'] = isset($gd_info['JPEG Support']) && $gd_info['JPEG Support'];
+			}
+			$ret['mysql'] = function_exists('mysql_connect');
+			$ret['json'] = function_exists('json_encode');
+
+			$original_memory_limit = ini_get('memory_limit');
+			ini_set('memory_limit', $original_memory_limit == '32M' ? '40M' : '32M');
+			$ret['memory_limit'] = 0;
+			if ($original_memory_limit != ini_get('memory_limit')) {
+				$ret['memory_limit'] = 1;
+				ini_set('memory_limit', $original_memory_limit);
+			}
+
+			$original_timezone = ini_get('date.timezone');
+			ini_set('date.timezone', $original_timezone == 'Asia/Delhi' ? 'Europe/London' : 'Asia/Delhi');
+			$ret['date.timezone'] = 0;
+			if ($original_timezone != ini_get('date.timezone')) {
+				$ret['date.timezone'] = 1;
+				ini_set('date.timezone', $original_timezone);
+			}
+			$ret['variables_order'] = (strpos(ini_get('variables_order'), 'GPC') !== false);
+			$ret['output_buffering'] = (ini_get('output_buffering') > 0);
+
+			return $ret;
+		}
+
+		/**
+		 * Returns information about DB requirements
+		 *
+		 * @return array
+		 */
+		function CheckDBRequirements()
+		{
+			// check PHP version 5.2+
+			$ret = Array();
+
+			$sql = 'SELECT version()';
+			$conn =& $this->getConnection();
+
+			$db_version = $conn->GetOne($sql);
+			$version_parts = explode('.', $db_version);
+			$ret['version'] = $version_parts[0] >= 5;
+
+			$sql = 'SHOW VARIABLES LIKE \'max_allowed_packet\'';
+			$a_db_variables = $conn->Query($sql, 'Variable_name');
+			$ret['packet_size'] = $a_db_variables['max_allowed_packet']['Value'] >= 1048576;
+
+			return $ret;
+		}
+
 	}
\ No newline at end of file
Index: install/step_templates/db_config.tpl
===================================================================
--- install/step_templates/db_config.tpl	(revision 14858)
+++ install/step_templates/db_config.tpl	(working copy)
@@ -1,3 +1,5 @@
+<?php $this->PrintDBRequirements(); ?>
+
 <tr class="table-color2">
 	<td class="text"><b>Database Server Type<span class="error">*</span>:</b></td>
   	<td align="left">
@@ -67,7 +69,7 @@
 </tr>
 
 <?php if ($this->GetVar('preset') != 'already_installed') { ?>
-<!--show this option ONLY when config.php is empty or cant connect to In-Portal installation using current DB settings --> 
+<!--show this option ONLY when config.php is empty or cant connect to In-Portal installation using current DB settings -->
 <tr class="table-color2">
 	<td class="text" width="55%"><b>Use existing In-Portal installation in this Database:</b></td>
 	<td align="left">
Index: install/step_templates/db_reconfig.tpl
===================================================================
--- install/step_templates/db_reconfig.tpl	(revision 14858)
+++ install/step_templates/db_reconfig.tpl	(working copy)
@@ -1,3 +1,5 @@
+<?php $this->PrintDBRequirements(); ?>
+
 <tr class="table-color2">
 	<td class="text"><b>Database Server Type<span class="error">*</span>:</b></td>
   	<td align="left">
Index: install/step_templates/install_setup.tpl
===================================================================
--- install/step_templates/install_setup.tpl	(revision 14858)
+++ install/step_templates/install_setup.tpl	(working copy)
@@ -32,6 +32,7 @@
 	$option_tpl = ob_get_clean();
 
 	$options = 	Array (
+		'sys_requirements'	=>	'Check System Requirements',
 		'upgrade'			=>	'Upgrade In-Portal',
 		'clean_reinstall'	=>	'Reinstall In-Portal',
 		'fresh_install'		=>	'Install In-Portal to a New Database',
Index: install/step_templates/sys_requirements.tpl
===================================================================
--- install/step_templates/sys_requirements.tpl	(revision 0)
+++ install/step_templates/sys_requirements.tpl	(revision 0)
@@ -0,0 +1,107 @@
+<?php
+    $cookies_enabled = 0;
+	if(isset($_COOKIE['test']) &&  $_COOKIE['test'] == $_REQUEST['cookies']) {
+	    $cookies_enabled = 1;
+	}
+
+	$heading_tpl = '
+		<tr class="subsectiontitle">
+			<td class="text" colspan="2" style="border-top: 1px solid #000000; border-bottom: 1px solid #000000;">%s</td>
+		</tr>';
+
+	$error_tpl = '
+		<tr class="table-color2">
+			<td class="text">%s</td>
+		  	<td align="center" width="30">%s</td>
+		</tr>';
+
+	$check_results = $this->toolkit->CallPrerequisitesMethod('core/', 'CheckSystemRequirements');
+
+	$output = sprintf($heading_tpl, '<strong>Server-side requirements</strong>');
+
+	$checks = Array (
+		'php_version' => 'PHP version: 5.2+ (required)',
+		'url_rewriting' => 'URL Rewriting Support (optional)',
+		'' => 'PHP extensions:',
+		'memcache' => '- Memcache (optional)',
+		'curl' => '- Curl (required)',
+		'freetype' => '- Freetype (required)',
+		'gd_version' => '- GD 1.8+ (required)',
+		'jpeg' => '- jpeg (required)',
+		'mysql' => '- MySQL (required)',
+		'json' => '- JSON (optional)',
+		' ' => 'PHP settings:',
+		'memory_limit' => '- ini_set(\'memory_limit\', ...) works (optional)',
+		'date.timezone' => '- ini_get(\'date.timezone\') - timezone set (required)',
+		'variables_order' => '- ini_get(\'variables_order\') - contains "GPC" string',
+		'output_buffering' => '- ini_get(\'output_buffering\') > 0 - buffering works (required)',
+	);
+
+	$required_checks = Array (
+		'php_version',
+		'curl',
+		'freetype',
+		'gd_version',
+		'jpeg',
+		'mysql',
+		'date.timezone',
+		'output_buffering',
+	);
+
+
+	$has_error = !$cookies_enabled;
+	foreach ($checks AS $key => $label) {
+		$error = '';
+		if (isset($check_results[$key])) {
+			if (!$check_results[$key] && in_array($key, $required_checks)) {
+				$has_error = 1;
+			}
+			$error = $check_results[$key] ? '[<span style="color:green;">PASSED</span>]' : '[<span class="error">FAILED</span>]';
+		}
+		$output .= sprintf($error_tpl, $label, $error);
+	}
+
+//PHP version: 5.2+ (required)
+//MySQL version: 5.1+ (required)
+//MySQL Packet Size: 2MB min (required for large website, optional for small website)
+//URL Rewriting Support: yes/no (optional)
+//PHP extensions:
+//- Memcache (optional); Memcache class
+//- Curl (required); curl_init function
+//- Freetype (required); imagettfbbox function
+//- GD 1.8+ (required)
+//- jpeg (required)
+//- MySQL; mysql_connect function (required)
+//- JSON (optional); json_encode function
+//- Java (optional); run "java args" (need to determine args that cause error on incorrectly installed java)
+//
+//PHP settings:
+//- ini_set('memory_limit', ...) - works/don't work (optional)
+//- ini_get('date.timezone') - timezone set/not set (required)
+//- ini_get('gpc_order') - contains "GPC" string
+//- ini_get('output_buffering') > 0 - buffering works (required)
+//
+
+	$output .= sprintf($heading_tpl, '<strong>Client-side requirements</strong>', 'text');
+
+	$error = $cookies_enabled ? '[<span style="color:green;">PASSED</span>]': '[<span class="error">FAILED</span>]';
+	$output .= sprintf($error_tpl, 'Cookies enabled', $error);
+
+	$output .= '<input type="hidden" id="cookies" name="cookies" value="'.$_REQUEST['cookies'].'"/>';
+	$output .= '<input type="hidden" id="errors" name="errors" value="1"/>';
+	$output .= '<input type="hidden" id="has_error_beyound_js" name="has_error_beyound_js" value="'.$has_error.'"/>';
+
+	$output .= '
+		<tr class="table-color2">
+			<td class="text">JavaScript enabled</td>
+		  	<td align="center" width="30">[<span id="check_javascript" class="error">FAILED</span>]</td>
+		</tr>
+		<script type="text/javascript">
+			$("#check_javascript").attr("class","").css("color","green").html("PASSED");
+			if (!$("#has_error_beyound_js").val()) {
+				$("#errors").val("");
+			}
+		</script>
+		';
+	echo $output;
+?>
\ No newline at end of file
Index: install/steps_db.xml
===================================================================
--- install/steps_db.xml	(revision 14858)
+++ install/steps_db.xml	(working copy)
@@ -207,4 +207,7 @@
 		The characters entered in this field are placed <i>before</i> the names of the tables used by In-Portal.
 		For example, if you enter "inp_" into the prefix field, the table named Category will be named inp_Category.</p>]]>
 	</step>
+    <step name="sys_requirements" title="System Requirements Check">
+    	<![CDATA[The <i>System Requirements Check</i> option should be used to ensure proper system behavior in the current environment.]]>
+    </step>
 </steps>
\ No newline at end of file