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Path: /data/applications/aps/gallery/2.2-08/htdocs/install/steps/ [ Home ]
File: SystemChecksStep.class
<?php
/*
 * Gallery - a web based photo album viewer and editor
 * Copyright (C) 2000-2007 Bharat Mediratta
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA  02110-1301, USA.
 */

/**
 * System checks
 * @package Install
 */
class SystemChecksStep extends InstallStep {
    function stepName() {
	return _('System Checks');
    }

    /*
     * Returns the exact bytes value from a php.ini setting
     * Copied from PHP.net's manual entry for ini_get()
     */
    function _getBytes($val) {
	$val = trim($val);
	$last = $val{strlen($val)-1};
	switch ($last) {
	case 'g':
	case 'G':
	    $val *= 1024;
	case 'm':
	case 'M':
	    $val *= 1024;
	case 'k':
	case 'K':
	    $val *= 1024;
	}
	return $val;
    }

    function processRequest() {
	/* Zend test */
	if (!empty($_GET['zendtest'])) {
	    header("Content-Type: text/plain");
	    header("Content-Length: 8");
	    $x = array(new stdclass());
	    /* v-- This may cause PHP to crash! */
	    $x = $x[0];
	    print "SUCCESS\n";
	    return false;
	}
	/* Normal request */

	/* Create GalleryStub to store information for the install core step / install log */
	global $galleryStub;
	$galleryStub = new GalleryStub();
	$failCount = 0;
	$suggestedHtaccess = array();
	$setTimeLimitAvailable = false;

	$template = new StatusTemplate();
	$template->renderHeader(true);
	$template->renderStatusMessage(_('Performing system checks'), '', 0);

	/* assert compatible version of PHP, we accept 4.3.0+ / 5.0.4+ */
	if (!function_exists('version_compare') || version_compare(phpversion(), '4.3.0', '<')
		|| (version_compare(phpversion(), '5.0.0', '>=')
		    && version_compare(phpversion(), '5.0.4', '<'))) {
	    $templateData['check'][] =
		array('title' => _('PHP version >= 4.3.0 or >= 5.0.4'),
		      'error' => true,
		      'notice' => sprintf(
			  _("Error: Gallery 2 requires PHP version 4.3.0 or newer or 5.0.4 or " .
			    "newer. You have PHP version %s installed. Contact your webserver " .
			    "administrator to request an upgrade, available at the %sPHP " .
			    "website%s."), phpversion(), '<a href="http://php.net/">', '</a>'));
	    $failCount++;
	} else {
	    $templateData['check'][] =
		array('title' => _('PHP Version'), 'success' => true);
	}

	/* assert that __FILE__ works correctly */
	if (!SystemChecksStep::CheckFileDirective()) {
	    $templateData['check'][] =
		array('title' => _('FILE directive supported'),
		      'error' => true,
		      'notice' => _('Error: your PHP __FILE__ directive is not functioning ' .
				    'correctly. Please file a support request with your ' .
				    'webserver administrator or in the Gallery forums.'));
	    $failCount++;
	} else {
	    $templateData['check'][] =
		array('title' => _('FILE Directive'), 'success' => true);
	}

	/* Make sure that safe mode is not enabled */
	if (GalleryUtilities::getPhpIniBool('safe_mode')) {
	    $templateData['check'][] =
		array('title' => _('Safe mode disabled'),
		      'error' => true,
		      'notice' => _('Error: Your version of PHP is configured with safe mode ' .
			  'enabled.  You must disable safe mode before Gallery will run.'));
	    $failCount++;
	} else {
	    $templateData['check'][] =
		array('title' => _('Safe Mode'), 'success' => true);
	}

	/* Make sure we have PCRE support */
	if (!function_exists('preg_match') || !function_exists('preg_replace')) {
	    $templateData['check'][] =
		array('title' => _('Regular expressions'),
		      'error' => true,
		      'notice' => sprintf(
			  _('Error: Your PHP is configured without support for %sPerl Compatible ' .
			    'Regular Expressions%s. You must enable these functions before ' .
			    'Gallery will run.'), '<a href="http://php.net/pcre">', '</a>'));
	    $failCount++;
	} /* skip showing 'success' for this one */

	/* Warning when exec() is disabled */
	if (in_array('exec', split(',\s*', ini_get('disable_functions')))) {
	    $templateData['check'][] =
		array('title' => _('exec() allowed'),
		      'warning' => true,
		      'notice' =>
		      _('Warning: The exec() function is disabled in your PHP by the <b>disabled' .
			'_functions</b> parameter in php.ini. You won\'t be able to use modules ' .
			'that require external binaries (e.g. ImageMagick, NetPBM or Ffmpeg). ' .
			'This can only be set server-wide, so you will need to change it in the ' .
			'global php.ini.'),
		);
	} else {
	    $templateData['check'][] =
		array('title' => _('exec() allowed'), 'success' => true);
	}

	/* Warning when set_time_limit() is disabled */
	if (in_array('set_time_limit', split(',\s*', ini_get('disable_functions')))) {
	    $timeLimit = ini_get('max_execution_time');
	    $templateData['check'][] =
		array('title' => _('set_time_limit() allowed'),
		      'warning' => true,
		      'notice' => sprintf(
			  _('Warning: The set_time_limit() function is disabled in your PHP by ' .
			    'the <b>disabled_functions</b> parameter in php.ini.  Gallery can ' .
			    'function with this setting, but it will not operate reliably.  ' .
			    'Any operation that takes longer than %d seconds will fail (and in ' .
			    'some cases just return a blank page) possibly leading to data ' .
			    'corruption.'), $timeLimit),
		);
	} else {
	    $templateData['check'][] =
		array('title' => _('set_time_limit() allowed'), 'success' => true);

	    /* Set the time limit large enough for the remaining checks (slow systems) */
	    set_time_limit(180);
	    $setTimeLimitAvailable = true;
	}

	$template->renderStatusMessage(_('Performing system checks'), '', 0.02);

	/* Make sure filesystem operations are allowed */
	$missingFilesystemFunctions = array();
	foreach (array('fopen', 'fclose', 'fread', 'fwrite', 'file', 'copy', 'rename', 'readfile',
		'file_get_contents', 'copy', 'move_uploaded_file', 'file_exists', 'tempnam', 'glob',
		'closedir', 'stat', 'unlink', 'rmdir', 'mkdir', 'getcwd', 'chdir', 'opendir',
		'readdir', 'chmod') as $function) {
	    if (!function_exists($function)) {
		$missingFilesystemFunctions[] = $function;
	    }
	}
	if (!empty($missingFilesystemFunctions)) {
	    $templateData['check'][] =
		array('title' => _('Filesystem Operations'),
		      'error' => true,
		      'notice' => sprintf(
			  _('Error: Essential filesystem operations are disabled in your PHP by ' .
			    'the <b>disabled_functions</b> parameter in php.ini. You must allow ' .
			    'these functions before Gallery will run. These functions are ' .
			    'missing: %s.'),
			  implode(', ', $missingFilesystemFunctions)));
	    $failCount++;
	} /* skip showing 'success' for this one */

	/* Warning if memory_limit is set and is too low */
	$memoryLimit = ini_get('memory_limit');
	$title = sprintf('%s (%s)', _('Memory limit'),
			 ($memoryLimit == '' ? _('no limit') : $memoryLimit . 'b'));
	$minimumMemoryLimit = 16;
	if ($memoryLimit != ''
		&& ($this->_getBytes($memoryLimit) / (1024 * 1024)) < $minimumMemoryLimit) {
	    $templateData['check'][] =
		array('title' => $title,
		      'warning' => true,
		      'notice' => sprintf(
			  _('Warning: Your PHP is configured to limit the memory to %sb (<b>' .
			    'memory_limit</b> parameter in php.ini). You should raise this limit ' .
			    'to at least <b>%sMB</b> for proper Gallery operation.'),
			  $memoryLimit, $minimumMemoryLimit),
		);
	    $suggestedHtaccess[] = sprintf('php_value memory_limit %sM', $minimumMemoryLimit);
	} else {
	    $templateData['check'][] =
		array('title' => $title, 'success' => true);
	}

	/* Warning if file_uploads are not allowed */
	if (! GalleryUtilities::getPhpIniBool('file_uploads')) {
	    $templateData['check'][] =
		array('title' => _('File uploads allowed'),
		      'warning' => true,
		      'notice' =>
		      _('Warning: Your PHP is configured not to allow file uploads (<b>file_' .
			'uploads</b> parameter in php.ini). You will need to enable this option ' .
			'if you want to upload files to your Gallery with a web browser.'),
		);
	    $suggestedHtaccess[] = 'php_flag file_uploads on';
	} else {
	    $templateData['check'][] =
		array('title' => _('File uploads allowed'), 'success' => true);
	}

	/* Warning if upload_max_filesize is less than 2M */
	$title = sprintf('%s (%sb)', _('Maximum upload size'), ini_get('upload_max_filesize'));
	$minimumUploadsize = 2;
	$uploadSize = $this->_getBytes(ini_get('upload_max_filesize')) / (1024 * 1024);
	if ($uploadSize < $minimumUploadsize) {
	    $templateData['check'][] =
		array('title' => $title,
		      'warning' => true,
		      'notice' => sprintf(
			  _('Warning: Your PHP is configured to limit the size of file uploads to' .
			    ' %sb (<b>upload_max_filesize</b> parameter in php.ini). You should ' .
			    'raise this limit to allow uploading bigger files.'),
			  ini_get('upload_max_filesize')),
		);
	    $suggestedHtaccess[] = sprintf('php_value upload_max_filesize %sM', $minimumUploadsize);
	} else {
	    $templateData['check'][] =
		array('title' => $title, 'success' => true);
	}

	/* Warning if post_max_size is less than 2M */
	$title = sprintf('%s (%sb)', _('Maximum POST size'), ini_get('post_max_size'));
	$minimumPostsize = 2;
	$postSize = $this->_getBytes(ini_get('post_max_size')) / (1024 * 1024);
	if ($postSize < $minimumPostsize) {
	    $templateData['check'][] =
		array('title' => $title,
		      'warning' => true,
		      'notice' => sprintf(
			  _('Warning: Your PHP is configured to limit the post data to a maximum ' .
			    'of %sb (<b>post_max_size</b> parameter in php.ini). You should raise' .
			    ' this limit to allow uploading bigger files.'),
			  ini_get('post_max_size')),
		);
	    $suggestedHtaccess[] = sprintf('php_value post_max_size %sM', $minimumPostsize);
	} else {
	    $templateData['check'][] =
		array('title' => $title, 'success' => true);
	}

	/* Check for gettext support */
	$title = _('Translation support');
	if (!function_exists('dgettext')) {
	    $templateData['check'][] =
		array('title' => $title,
		      'warning' => true,
		      'notice' => sprintf(
			  _('Your webserver does not support localization. To enable support for ' .
			    'additional languages please instruct your system administrator to ' .
			    'reconfigure PHP with the %sgettext%s option enabled.'),
			  '<a href="http://php.net/gettext">', '</a>'));
	} else if (!function_exists('bind_textdomain_codeset')) {
	    $templateData['check'][] =
		array('title' => $title,
		      'warning' => true,
		      'notice' => sprintf(
			  _('Your PHP is missing the function %sbind_textdomain_codeset%s. This ' .
			    'means Gallery may display extended characters for some languages ' .
			    'incorrectly.'),
			  '<a href="http://php.net/bind_textdomain_codeset">', '</a>'));
	} else if (!function_exists('dngettext')) {
	    $templateData['check'][] =
		array('title' => $title,
		      'warning' => true,
		      'notice' => sprintf(
			  _('Your PHP is missing the function %sdngettext%s. This means Gallery ' .
			    'will be unable to translate plural forms.'),
			  '<a href="http://php.net/dngettext">', '</a>'));
	} else {
	    $templateData['check'][] = array('title' => $title, 'success' => true);
	}

	/* $x=$x[0] <--(an object) can crash PHP with zend.ze1_compatibility_mode ON */
	if (GalleryUtilities::getPhpIniBool('zend.ze1_compatibility_mode')) {
	    $templateData['check'][] =
		array('title' => _('Zend compatibility mode'),
		      'warning' => true,
		      'notice' => sprintf(
			  _('Warning: Your PHP is configured with Zend ze1_compatibility_mode ' .
			    'which can cause PHP to crash.  Click <a href="%s">here</a> to test ' .
			    'your PHP.  If you see "SUCCESS" then your PHP is ok.  If you get an ' .
			    'error or no response then you must turn off ze1_compatibility_mode ' .
			    'before proceeding.'),
			  INDEX_PHP . '?step=' . $this->_stepNumber . '&amp;zendtest=1'),
		);
	} /* skip showing 'success' for this one */

	/* Warning if putenv is disabled */
	if (in_array('putenv', split(',\s*', ini_get('disable_functions')))) {
	    $templateData['check'][] =
		array('title' => _('putenv() allowed'),
		      'warning' => true,
		      'notice' =>
		      _('Warning: The putenv() function is disabled in your PHP by the <b>' .
			'disabled_functions</b> parameter in php.ini.  Gallery can function with ' .
			'this setting, but on some rare systems Gallery will be unable to run in ' .
			'other languages than the system language and English.'),
		);
	} /* skip showing 'success' for this one */

	/* Warning if output_buffering / handlers are enabled */
	$outputBuffers = array();
	foreach (array('output_buffering', 'zlib.output_compression') as $outputFunction) {
	    if (GalleryUtilities::getPhpIniBool($outputFunction) ||
		    (int) ini_get($outputFunction) > 0) {
		$outputBuffers[] = $outputFunction;
	    }
	}
	foreach (array('output_handler', 'zlib.output_handler') as $outputHandler) {
	    if (($value = ini_get($outputHandler)) && !empty($value)) {
		$outputBuffers[] = $outputHandler;
	    }
	}
	if (!empty($outputBuffers)) {
	    $templateData['check'][] =
		array('title' => _('Output buffering disabled'),
		      'warning' => true,
		      'notice' => sprintf(
			  _('Warning: Output buffering is enabled in your PHP by the <b>%s</b> ' .
			    'parameter(s) in php.ini.  Gallery can function with this setting - ' .
			    'downloading files is even faster - but Gallery might be unable to ' .
			    'serve large files (e.g. large videos) and run into the memory limit.' .
			    ' Also, some features like the progress bars might not work correctly' .
			    ' if output buffering is enabled unless ini_set() is allowed.'),
			  implode(', ', $outputBuffers)),
		);
	} /* skip showing 'success' for this one */

	$template->renderStatusMessage(_('Performing system checks'), '', 0.06);

	/* Check all files against MANIFEST */
	$title = _('Gallery file integrity');
	if (!SystemChecksStep::CheckFileDirective() || !empty($missingFilesystemFunctions)) {
	    $templateData['check'][] =
		array('title' => $title,
		      'warning' => true,
		      'notice' => _('Test skipped due to other errors.'));
	} else {
	    /* Error if no themes are available */
	    if (!SystemChecksStep::AssertThemeIsAvailable()) {
		$templateData['check'][] =
		    array('title' => _('Theme available'),
			  'error' => true,
			  'notice' => sprintf(
				_('Error: There must be at least one theme in the %s folder!'),
				dirname(dirname(dirname(__FILE__)))
					. DIRECTORY_SEPARATOR . 'themes')
			);
		$failCount++;
	    } /* skip showing 'success' for this one */

	    /* Now check the MANIFEST files */
	    $isSvnInstall = file_exists(dirname(__FILE__) . '/.svn');
	    $manifest = SystemChecksStep::CheckManifest($template, $setTimeLimitAvailable);
	    if (!isset($manifest)) {
		$templateData['check'][] =
		    array('title' => $title,
			  'warning' => true,
			  'notice' => _('Manifest missing or inaccessible.'));

		$galleryStub->setConfig('systemchecks.fileintegrity',
					'Manifest missing or inaccessible.');
	    } else if (empty($manifest['missing']) && empty($manifest['modified'])
		       && empty($manifest['shouldRemove'])) {
		$templateData['check'][] = array('title' => $title, 'success' => true);

		$galleryStub->setConfig('systemchecks.fileintegrity',
					'Ok');
	    } else {
		ob_start();
		include(dirname(__FILE__) . '/../templates/ManifestSystemCheck.html');
		$notice = ob_get_contents();
		ob_end_clean();

		$templateData['check'][] =
		    array('title' => $title,
			  'warning' => true,
			  'notice' => $notice);

		if (empty($manifest['missing']) && empty($manifest['modified'])) {
		    $galleryStub->setConfig('systemchecks.fileintegrity',
					    'There are some old files');
		} else {
		    $galleryStub->setConfig('systemchecks.fileintegrity',
					    'There are missing/modified files!');
		}
	    }
	    $galleryStub->setConfig('systemchecks.issvninstall', $isSvnInstall);
	}

	$template->renderStatusMessage(_('Performing system checks'), '', 1);
	$template->hideStatusBlock();

	$templateData['suggestedHtaccess'] = join("\n", $suggestedHtaccess);
	$templateData['bodyFile'] = 'SystemChecks.html';
	$this->setComplete($failCount == 0);
	$this->setInError($failCount > 0);
	$template->renderBodyAndFooter($templateData);
	return false;
    }

    function CheckFileDirective() {
	if (strstr(__FILE__, 'install/steps/SystemChecksStep.class') ||
	    strstr(__FILE__, '\\install\\steps\\SystemChecksStep.class')) {
	    return true;
	} else {
	    return false;
	}
    }

    /** Verify that there is at least one themes/.../theme.inc file. */
    function AssertThemeIsAvailable() {
	$themesFolder = dirname(dirname(dirname(__FILE__))) . '/themes/' ;
	if (!file_exists($themesFolder)) {
	    return false;
	}
	$dh = opendir($themesFolder);
	if (!$dh) {
	    return false;
	}
	while (false !== ($folder = readdir($dh))) {
	    if ($folder == '..' || $folder == '.') {
		continue;
	    }
	    if (file_exists($themesFolder . $folder . '/theme.inc')) {
		closedir($dh);
		return true;
	    }
	}
	closedir($dh);
	return false;
    }

    function CheckManifest(&$statusMonitor, $useSetTimeLimit) {
	$base = realpath(dirname(__FILE__) . '/../..') . '/';

	if ($useSetTimeLimit) {
	    set_time_limit(180);
	}
	$manifest = GalleryUtilities::readManifest();
	if (empty($manifest)) {
	    return null;
	}

	$statusMonitor->renderStatusMessage(_('Performing system checks'), '', 0.1);
	if ($useSetTimeLimit) {
	    set_time_limit(180);
	}

	$missing = $modified = $shouldRemove = array();
	$stepSize = max((int)(count($manifest) / 22), 1);
	$i = 0;
	foreach ($manifest as $file => $info) {
	    $i++;
	    if ($file == 'MANIFEST') {
		continue;
	    }
	    $path = $base . $file;

	    if ($i % $stepSize == 0) {
		$statusMonitor->renderStatusMessage(_('Performing system checks'), '',
				0.12 + $i / $stepSize * 0.04);
		if ($useSetTimeLimit) {
		    set_time_limit(180);
		}
	    }

	    if (!empty($info['removed'])) {
		if (file_exists($path)) {
		    $shouldRemove[] = $file;
		}
	    } else if (!file_exists($path)) {
		$missing[] = $file;
	    } else {
		/*
		 * Use size comparison instead of checksum for speed.  We have
		 * two sizes, one calculated with unix eols, one with windows eols.
		 */
		$actualSize = filesize($path);
		if ($actualSize != $info['size'] && $actualSize != $info['size_crlf']) {
		    /* This can be useful debug info */
		    if (false) {
			printf("%s (expected: %s/%s, actual: %s)<br/>", $file,
			       $info['size'], $info['size_crlf'], $actualSize);
		    }
		    $modified[] = $file;
		}
	    }
	}

	return array('missing' => $missing, 'modified' => $modified,
		     'shouldRemove' => $shouldRemove);
    }
}
?>