<?php

namespace {
    /**
     * Matomo - free/libre analytics platform
     *
     * @link    https://matomo.org
     * @license https://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
     */
    /**
     * This file is executed before anything else.
     * It checks the minimum PHP version required to run Matomo.
     * This file must be compatible with PHP 5.3.
     */
    $piwik_errorMessage = '';
    // Minimum requirement: stream_resolve_include_path, working json_encode in 5.3.3, namespaces in 5.3
    // NOTE: when changing this variable, we also need to update
    // 1) api.matomo.org
    // 2) composer.json (in two places)
    // 3) tests/PHPUnit/Integration/ReleaseCheckListTest.php
    global $piwik_minimumPHPVersion;
    $piwik_minimumPHPVersion = '7.2.5';
    $piwik_currentPHPVersion = \PHP_VERSION;
    $minimumPhpInvalid = \version_compare($piwik_minimumPHPVersion, $piwik_currentPHPVersion) > 0;
    if ($minimumPhpInvalid) {
        $piwik_errorMessage .= "<p><strong>To run Matomo you need at least PHP version {$piwik_minimumPHPVersion}</strong></p>\n\t\t\t\t<p>Unfortunately it seems your webserver is using PHP version {$piwik_currentPHPVersion}. </p>\n\t\t\t\t<p>Please try to update your PHP version, Matomo is really worth it! Nowadays most web hosts\n\t\t\t\tsupport PHP {$piwik_minimumPHPVersion}.</p>";
    } else {
        if (!\extension_loaded('session')) {
            $piwik_errorMessage .= "<p><strong>Matomo and Zend_Session require the session extension</strong></p>\n\t\t\t\t\t<p>It appears your PHP was compiled with <pre>--disable-session</pre>.\n\t\t\t\t\tTo enjoy Matomo, you need PHP compiled without that configure option.</p>";
        }
        if (!\function_exists('ini_set')) {
            $piwik_errorMessage .= "<p><strong>Matomo and Zend_Session require the <code>ini_set()</code> function</strong></p>\n\t\t\t\t\t<p>It appears your PHP has disabled this function.\n\t\t\t\t\tTo enjoy Matomo, you need remove <pre>ini_set</pre> from your <pre>disable_functions</pre> directive in php.ini, and restart your webserver.</p>";
        }
        if (\ini_get('mbstring.func_overload')) {
            $piwik_errorMessage .= "<p><strong>Matomo does not work when PHP is configured with <pre>mbstring.func_overload = " . \ini_get('mbstring.func_overload') . "</pre></strong></p>\n\t\t\t\t\t<p>It appears your mbstring extension in PHP is configured to override string functions.\n\t\t\t\t\tTo enjoy Matomo, you need to modify php.ini <pre>mbstring.func_overload = 0</pre>, and restart your webserver.</p>";
        }
        if (!\function_exists('json_encode')) {
            $piwik_errorMessage .= "<p><strong>Matomo requires the php-json extension which provides the functions <code>json_encode()</code> and <code>json_decode()</code></strong></p>\n\t\t\t\t\t<p>It appears your PHP has not yet installed the php-json extension.\n\t\t\t\t\tTo use Matomo, please ask your web host to install php-json or install it yourself, for example on debian system: <code>sudo apt-get install php-json</code>. <br/>Then restart your webserver and refresh this page.</p>";
        }
        if (!\file_exists(\PIWIK_VENDOR_PATH . '/autoload.php')) {
            $composerInstall = "In the matomo directory, run in the command line the following (eg. via ssh): \n\n" . "<pre> curl -sS https://getcomposer.org/installer | php \n\n php composer.phar install\n\n</pre> ";
            if (\DIRECTORY_SEPARATOR === '\\') {
                $composerInstall = "Download and run <a href=\"https://getcomposer.org/Composer-Setup.exe\"><b>Composer-Setup.exe</b></a>, it will install the latest Composer version and set up your PATH so that you can just call composer from any directory in your command line. " . " <br>Then run this command in a terminal in the matomo directory: <br> \$ php composer.phar install ";
            }
            $piwik_errorMessage .= "<p>It appears the <a href='https://getcomposer.org/' rel='noreferrer noopener' target='_blank'>composer</a> tool is not yet installed. You can install Composer in a few easy steps:\n\n" . "<br/>" . $composerInstall . " This will initialize composer for Matomo and download libraries we use in vendor/* directory." . "\n\n<br/><br/>Then reload this page to access your analytics reports." . "\n\n<br/><br/>For more information check out this FAQ: <a href='https://matomo.org/faq/how-to-install/faq_18271/' rel='noreferrer noopener' target='_blank'>How do I use Matomo from the Git repository?</a>." . "\n\n<br/><br/>Note: if for some reasons you cannot install composer, instead install the latest Matomo release from " . "<a href='https://builds.matomo.org/piwik.zip' rel='noreferrer noopener'>builds.matomo.org</a>.</p>";
        }
    }
    \define('PAGE_TITLE_WHEN_ERROR', 'Matomo &rsaquo; Error');
    if (!\function_exists('Piwik_GetErrorMessagePage')) {
        /**
         * Returns true if Piwik should print the backtrace with error messages.
         *
         * To make sure the backtrace is printed, define PIWIK_PRINT_ERROR_BACKTRACE.
         *
         * @return bool
         */
        function Piwik_ShouldPrintBackTraceWithMessage()
        {
            if (!\class_exists(\Piwik\ExceptionHandler::class)) {
                return \false;
            }
            return \Piwik\ExceptionHandler::shouldPrintBackTraceWithMessage();
        }
        /**
         * Displays info/warning/error message in a friendly UI and exits.
         *
         * Note: this method should not be called by anyone other than FrontController.
         *
         * @param string $message Main message, must be html encoded before calling
         * @param bool|string $optionalTrace Backtrace; will be displayed in lighter color
         * @param bool $optionalLinks If true, will show links to the Piwik website for help
         * @param bool $optionalLinkBack If true, displays a link to go back
         * @param bool|string $logoUrl The URL to the logo to use.
         * @param bool|string $faviconUrl The URL to the favicon to use.
         * @param string $errorLogPrefix String to prepend to the error in log file
         * @param bool $writeErrorLog If true then a webserver error log will be written, defaults to true
         * @return string
         */
        function Piwik_GetErrorMessagePage($message, $optionalTrace = \false, $optionalLinks = \false, $optionalLinkBack = \false, $logoUrl = \false, $faviconUrl = \false, $isCli = null, $errorLogPrefix = '', $writeErrorLog = \true, $redirectUrl = null, $countdown = null)
        {
            $hasCountdownRedirect = !empty($redirectUrl) && !empty($countdown);
            if ($writeErrorLog) {
                \error_log(\sprintf("{$errorLogPrefix}Error in Matomo: %s", \str_replace("\n", " ", \strip_tags($message))));
            }
            if (!\headers_sent()) {
                \header('Content-Type: text/html; charset=utf-8');
                \header('Cache-Control: private, no-cache, no-store');
                $isInternalServerError = \preg_match('/(sql|database|mysql)/i', $message);
                if ($isInternalServerError) {
                    \header('HTTP/1.1 500 Internal Server Error');
                }
            }
            // We return only an HTML fragment for AJAX requests
            if (isset($_SERVER['HTTP_X_REQUESTED_WITH']) && \strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) === 'xmlhttprequest') {
                return "<div class='alert alert-danger'><strong>Error:</strong> {$message}</div>";
            }
            if (empty($logoUrl)) {
                $logoUrl = "plugins/Morpheus/images/logo.svg";
            }
            if (empty($faviconUrl)) {
                $faviconUrl = "plugins/CoreHome/images/favicon.png";
            }
            if ($optionalTrace) {
                $optionalTrace = '<h2>Stack trace</h2><pre>' . \htmlentities($optionalTrace, \ENT_COMPAT | \ENT_HTML401, 'UTF-8') . '</pre>';
            }
            if ($isCli === null) {
                $isCli = \PHP_SAPI == 'cli';
            }
            if ($optionalLinks) {
                $adjustUrl = function ($url) {
                    if (\class_exists(\Piwik\Url::class)) {
                        return \Piwik\Url::addCampaignParametersToMatomoLink($url);
                    }
                    return $url;
                };
                $optionalLinks = '<ul>
                            <li><a rel="noreferrer noopener" target="_blank" href="' . $adjustUrl('https://matomo.org') . '">Matomo.org homepage</a></li>
                            <li><a rel="noreferrer noopener" target="_blank" href="' . $adjustUrl('https://matomo.org/faq/') . '">Frequently Asked Questions</a></li>
                            <li><a rel="noreferrer noopener" target="_blank" href="' . $adjustUrl('https://matomo.org/docs/') . '">User Guides</a></li>
                            <li><a rel="noreferrer noopener" target="_blank" href="' . $adjustUrl('https://forum.matomo.org/') . '">Matomo Forums</a></li>
                            <li><a rel="noreferrer noopener" target="_blank" href="' . $adjustUrl('https://matomo.org/support/') . '">Professional Support for Matomo</a></li>
                            </ul>';
            }
            if ($optionalLinkBack) {
                $optionalLinkBack = '<a href="javascript:window.history.back();">Go Back</a>';
            }
            $headerPage = \file_get_contents(\PIWIK_INCLUDE_PATH . '/plugins/Morpheus/templates/simpleLayoutHeader.tpl');
            $headerPage = \str_replace('%logoUrl%', $logoUrl, $headerPage);
            $headerPage = \str_replace('%faviconUrl%', $faviconUrl, $headerPage);
            $footerPage = \file_get_contents(\PIWIK_INCLUDE_PATH . '/plugins/Morpheus/templates/simpleLayoutFooter.tpl');
            $headerPage = \str_replace('{$HTML_TITLE}', \PAGE_TITLE_WHEN_ERROR, $headerPage);
            $backLinks = '<p>' . $optionalLinkBack . ' | <a href="index.php">Go to Matomo</a>' . '</p>';
            $redirectSection = '';
            if ($hasCountdownRedirect) {
                $redirectSection = '<p>
                                Please click below if you are not redirected in ' . $countdown . ' seconds</br></br>
                                Go to <a href="' . $redirectUrl . '">' . \htmlspecialchars($redirectUrl) . '</a> 
                                </p>
                                <style>.header,.footer { display:none;}</style>
                                <script>setTimeout(function(){window.location.href="' . $redirectUrl . '"}, ' . $countdown * 1000 . ');</script>';
                $backLinks = '';
                $optionalLinks = '';
            }
            $content = '<h2>' . $message . '</h2>' . $redirectSection . $backLinks . ' ' . (\Piwik_ShouldPrintBackTraceWithMessage() ? $optionalTrace : '') . ' ' . $optionalLinks;
            $message = \str_replace(array("<br />", "<br>", "<br/>", "</p>"), "\n", $message);
            $message = \str_replace("\t", "", $message);
            $message = \strip_tags($message);
            if (!$isCli) {
                $message = $headerPage . $content . $footerPage;
            }
            $message .= "\n";
            return $message;
        }
    }
    if (!empty($piwik_errorMessage)) {
        echo \Piwik_GetErrorMessagePage($piwik_errorMessage, \false, \true);
        exit(1);
    }
}
