Admidio/admidio

<?php
/**
 ***********************************************************************************************
 * Admidio update check
 *
 * @copyright The Admidio Team
 * @see https://www.admidio.org/
 * @license https://www.gnu.org/licenses/gpl-2.0.html GNU General Public License v2.0 only
 *
 * Parameters:
 *
 * mode         : 1 - (Default) check availability of updates
 *                2 - Show results of update check
 ***********************************************************************************************
 */
use Admidio\Exception;

require_once(__DIR__ . '/../../system/common.php');

try {
    // Initialize and check the parameters
    $getMode = admFuncVariableIsValid($_GET, 'mode', 'int', array('defaultValue' => 1, 'directOutput' => true));

    if (!$gCurrentUser->isAdministrator()) {
        throw new Exception('SYS_NO_RIGHTS');
    }

    /**
     * Function to determine the update version
     * @param string $updateInfo
     * @param string $search
     * @return string
     */
    function getUpdateVersion(string $updateInfo, string $search): string
    {
        // Variablen festlegen
        $i = 0;
        $pointer = '';
        $updateVersion = '';
        $currentVersionStart = strpos($updateInfo, $search);
        $adding = strlen($search) - 1;

        // Version auslesen
        while ($pointer !== "\n") {
            ++$i;
            $updateVersion .= $pointer;
            $pointer = $updateInfo[$currentVersionStart + $adding + $i];
        }

        return trim($updateVersion, "\n\r");
    }

    /**
     * Function to check an update
     * @param string $currentVersion
     * @param string $checkStableVersion
     * @param string $checkBetaVersion
     * @param string $betaRelease
     * @param string $betaFlag
     * @return int
     */
    function checkVersion(string $currentVersion, string $checkStableVersion, string $checkBetaVersion, string $betaRelease, string $betaFlag): int
    {
        // Update state (0 = No update, 1 = New stable version, 2 = New beta version, 3 = New stable + beta version)
        $update = 0;

        // Zunächst auf stabile Version prüfen
        if (version_compare($checkStableVersion, $currentVersion, '>')) {
            $update = 1;
        }

        // Check for beta version now
        $status = version_compare($checkBetaVersion, $currentVersion);
        if ($status === 1 || ($status === 0 && version_compare($betaRelease, $betaFlag, '>'))) {
            if ($update === 1) {
                $update = 3;
            } else {
                $update = 2;
            }
        }

        return $update;
    }

    // check availability of update information and if connected
    // read available Admidio versions from server (text file)
    // First select the method (CURL preferred)
    $updateInfoUrl = ADMIDIO_HOMEPAGE . 'update.txt';
    if (@file_get_contents($updateInfoUrl) === false) {
        // Admidio Versionen nicht auslesbar
        $stableVersion = 'n/a';
        $betaVersion = 'n/a';
        $betaRelease = '';

        $versionUpdate = 99;
    } else {
        $updateInfo = file_get_contents($updateInfoUrl);

        // Admidio versions passed from server
        $stableVersion = getUpdateVersion($updateInfo, 'Version=');
        $betaVersion = getUpdateVersion($updateInfo, 'Beta-Version=');
        $betaRelease = getUpdateVersion($updateInfo, 'Beta-Release=');

        // No stable version available (actually impossible)
        if ($stableVersion === '') {
            $stableVersion = 'n/a';
        }

        // No beat version available
        if ($betaVersion === '') {
            $betaVersion = 'n/a';
            $betaRelease = '';
        }

        // check for update
        $versionUpdate = checkVersion(ADMIDIO_VERSION, $stableVersion, $betaVersion, $betaRelease, ADMIDIO_VERSION_BETA);
    }

    // Only continues in display mode, otherwise the current update state can be
    // queried in the $versionUpdate variable.
    // $versionUpdate (0 = No update, 1 = New stable version, 2 = New beta version, 3 = New stable + beta version, 99 = No connection)
    if ($getMode === 2) {
        // show update result
        if ($versionUpdate === 1) {
            $versionsText = $gL10n->get('SYS_NEW_VERSION_AVAILABLE');
        } elseif ($versionUpdate === 2) {
            $versionsText = $gL10n->get('SYS_NEW_BETA_AVAILABLE');
        } elseif ($versionUpdate === 3) {
            $versionsText = $gL10n->get('SYS_NEW_BOTH_AVAILABLE');
        } elseif ($versionUpdate === 99) {
            $admidioLink = '<a href="' . ADMIDIO_HOMEPAGE . 'download.php" target="_blank">Admidio</a>';
            $versionsText = $gL10n->get('SYS_CONNECTION_ERROR', array($admidioLink));
        } else {
            $versionsTextBeta = '';
            if (ADMIDIO_VERSION_BETA > 0) {
                $versionsTextBeta = 'Beta ';
            }

            $versionsText = $gL10n->get('SYS_USING_CURRENT_VERSION', array($versionsTextBeta));
        }

        echo '
        <p>' . $gL10n->get('SYS_INSTALLED') . ':&nbsp;' . ADMIDIO_VERSION_TEXT . '</p>
        <p>' . $gL10n->get('SYS_AVAILABLE') . ':&nbsp;
            <a class="btn" href="' . ADMIDIO_HOMEPAGE . 'download.php" title="' . $gL10n->get('SYS_ADMIDIO_DOWNLOAD_PAGE') . '" target="_blank">' .
            '<i class="bi bi-link"></i>' . $stableVersion . '
            </a>
            <br />
            ' . $gL10n->get('SYS_AVAILABLE_BETA') . ': &nbsp;';

        if ($versionUpdate !== 99 && $betaVersion !== 'n/a') {
            echo '
            <a class="btn" href="' . ADMIDIO_HOMEPAGE . 'download.php" title="' . $gL10n->get('SYS_ADMIDIO_DOWNLOAD_PAGE') . '" target="_blank">' .
                '<i class="bi bi-link"></i>' . $betaVersion . ' Beta ' . $betaRelease . '
            </a>';
        } else {
            echo $betaVersion;
        }
        echo '
        </p>
        <strong>' . $versionsText . '</strong>';
    }
} catch (Exception $e) {
    echo $e->getMessage();
}