PHP bootstrap_renderer类代码示例

//.........这里部分代码省略.........
        // but it should not be very likely
        throw new moodle_exception('redirecterrordetected', 'error');
    }
    // prevent debug errors - make sure context is properly initialised
    if ($PAGE) {
        $PAGE->set_context(null);
    }
    if ($url instanceof moodle_url) {
        $url = $url->out(false);
    }
    if (!empty($CFG->usesid) && !isset($_COOKIE[session_name()])) {
        $url = $SESSION->sid_process_url($url);
    }
    $debugdisableredirect = false;
    do {
        if (defined('DEBUGGING_PRINTED')) {
            // some debugging already printed, no need to look more
            $debugdisableredirect = true;
            break;
        }
        if (empty($CFG->debugdisplay) or empty($CFG->debug)) {
            // no errors should be displayed
            break;
        }
        if (!function_exists('error_get_last') or !($lasterror = error_get_last())) {
            break;
        }
        if (!($lasterror['type'] & $CFG->debug)) {
            //last error not interesting
            break;
        }
        // watch out here, @hidden() errors are returned from error_get_last() too
        if (headers_sent()) {
            //we already started printing something - that means errors likely printed
            $debugdisableredirect = true;
            break;
        }
        if (ob_get_level() and ob_get_contents()) {
            // there is something waiting to be printed, hopefully it is the errors,
            // but it might be some error hidden by @ too - such as the timezone mess from setup.php
            $debugdisableredirect = true;
            break;
        }
    } while (false);
    if (!empty($message)) {
        if ($delay === -1 || !is_numeric($delay)) {
            $delay = 3;
        }
        $message = clean_text($message);
    } else {
        $message = get_string('pageshouldredirect');
        $delay = 0;
        // We are going to try to use a HTTP redirect, so we need a full URL.
        if (!preg_match('|^[a-z]+:|', $url)) {
            // Get host name http://www.wherever.com
            $hostpart = preg_replace('|^(.*?[^:/])/.*$|', '$1', $CFG->wwwroot);
            if (preg_match('|^/|', $url)) {
                // URLs beginning with / are relative to web server root so we just add them in
                $url = $hostpart . $url;
            } else {
                // URLs not beginning with / are relative to path of current script, so add that on.
                $url = $hostpart . preg_replace('|\\?.*$|', '', me()) . '/../' . $url;
            }
            // Replace all ..s
            while (true) {
                $newurl = preg_replace('|/(?!\\.\\.)[^/]*/\\.\\./|', '/', $url);
                if ($newurl == $url) {
                    break;
                }
                $url = $newurl;
            }
        }
    }
    if (defined('MDL_PERF') || (!empty($CFG->perfdebug) and $CFG->perfdebug > 7)) {
        if (defined('MDL_PERFTOLOG') && !function_exists('register_shutdown_function')) {
            $perf = get_performance_info();
            error_log("PERF: " . $perf['txt']);
        }
    }
    $encodedurl = preg_replace("/\\&(?![a-zA-Z0-9#]{1,8};)/", "&", $url);
    $encodedurl = preg_replace('/^.*href="([^"]*)".*$/', "\\1", clean_text('<a href="' . $encodedurl . '" />'));
    if ($delay == 0 && !$debugdisableredirect && !headers_sent()) {
        // workaround for IIS bug http://support.microsoft.com/kb/q176113/
        if (session_id()) {
            session_get_instance()->write_close();
        }
        //302 might not work for POST requests, 303 is ignored by obsolete clients.
        @header($_SERVER['SERVER_PROTOCOL'] . ' 303 See Other');
        @header('Location: ' . $url);
        echo bootstrap_renderer::plain_redirect_message($encodedurl);
        exit;
    }
    // Include a redirect message, even with a HTTP redirect, because that is recommended practice.
    $PAGE->set_pagelayout('redirect');
    // No header and footer needed
    $CFG->docroot = false;
    // to prevent the link to moodle docs from being displayed on redirect page.
    echo $OUTPUT->redirect_message($encodedurl, $message, $delay, $debugdisableredirect);
    exit;
}

/**
 * Check whether a major upgrade is needed. That is defined as an upgrade that
 * changes something really fundamental in the database, so nothing can possibly
 * work until the database has been updated, and that is defined by the hard-coded
 * version number in this function.
 */
function redirect_if_major_upgrade_required()
{
    global $CFG;
    $lastmajordbchanges = 2012110201;
    if (empty($CFG->version) or (int) $CFG->version < $lastmajordbchanges or during_initial_install() or !empty($CFG->adminsetuppending)) {
        try {
            @session_get_instance()->terminate_current();
        } catch (Exception $e) {
            // Ignore any errors, redirect to upgrade anyway.
        }
        $url = $CFG->wwwroot . '/' . $CFG->admin . '/index.php';
        @header($_SERVER['SERVER_PROTOCOL'] . ' 303 See Other');
        @header('Location: ' . $url);
        echo bootstrap_renderer::plain_redirect_message(htmlspecialchars($url));
        exit;
    }
}

/**
 * Enables CLI maintenance mode by creating new dataroot/climaintenance.html file.
 */
function enable_cli_maintenance_mode()
{
    global $CFG;
    if (file_exists("{$CFG->dataroot}/climaintenance.html")) {
        unlink("{$CFG->dataroot}/climaintenance.html");
    }
    if (isset($CFG->maintenance_message) and !html_is_blank($CFG->maintenance_message)) {
        $data = $CFG->maintenance_message;
        $data = bootstrap_renderer::early_error_content($data, null, null, null);
        $data = bootstrap_renderer::plain_page(get_string('sitemaintenance', 'admin'), $data);
    } else {
        if (file_exists("{$CFG->dataroot}/climaintenance.template.html")) {
            $data = file_get_contents("{$CFG->dataroot}/climaintenance.template.html");
        } else {
            $data = get_string('sitemaintenance', 'admin');
            $data = bootstrap_renderer::early_error_content($data, null, null, null);
            $data = bootstrap_renderer::plain_page(get_string('sitemaintenance', 'admin'), $data);
        }
    }
    file_put_contents("{$CFG->dataroot}/climaintenance.html", $data);
    chmod("{$CFG->dataroot}/climaintenance.html", $CFG->filepermissions);
}

//.........这里部分代码省略.........
    }
    $debugdisableredirect = false;
    do {
        if (defined('DEBUGGING_PRINTED')) {
            // Some debugging already printed, no need to look more.
            $debugdisableredirect = true;
            break;
        }
        if (core_useragent::is_msword()) {
            // Clicking a URL from MS Word sends a request to the server without cookies. If that
            // causes a redirect Word will open a browser pointing the new URL. If not, the URL that
            // was clicked is opened. Because the request from Word is without cookies, it almost
            // always results in a redirect to the login page, even if the user is logged in in their
            // browser. This is not what we want, so prevent the redirect for requests from Word.
            $debugdisableredirect = true;
            break;
        }
        if (empty($CFG->debugdisplay) or empty($CFG->debug)) {
            // No errors should be displayed.
            break;
        }
        if (!function_exists('error_get_last') or !($lasterror = error_get_last())) {
            break;
        }
        if (!($lasterror['type'] & $CFG->debug)) {
            // Last error not interesting.
            break;
        }
        // Watch out here, @hidden() errors are returned from error_get_last() too.
        if (headers_sent()) {
            // We already started printing something - that means errors likely printed.
            $debugdisableredirect = true;
            break;
        }
        if (ob_get_level() and ob_get_contents()) {
            // There is something waiting to be printed, hopefully it is the errors,
            // but it might be some error hidden by @ too - such as the timezone mess from setup.php.
            $debugdisableredirect = true;
            break;
        }
    } while (false);
    // Technically, HTTP/1.1 requires Location: header to contain the absolute path.
    // (In practice browsers accept relative paths - but still, might as well do it properly.)
    // This code turns relative into absolute.
    if (!preg_match('|^[a-z]+:|', $url)) {
        // Get host name http://www.wherever.com.
        $hostpart = preg_replace('|^(.*?[^:/])/.*$|', '$1', $CFG->wwwroot);
        if (preg_match('|^/|', $url)) {
            // URLs beginning with / are relative to web server root so we just add them in.
            $url = $hostpart . $url;
        } else {
            // URLs not beginning with / are relative to path of current script, so add that on.
            $url = $hostpart . preg_replace('|\\?.*$|', '', me()) . '/../' . $url;
        }
        // Replace all ..s.
        while (true) {
            $newurl = preg_replace('|/(?!\\.\\.)[^/]*/\\.\\./|', '/', $url);
            if ($newurl == $url) {
                break;
            }
            $url = $newurl;
        }
    }
    // Sanitise url - we can not rely on moodle_url or our URL cleaning
    // because they do not support all valid external URLs.
    $url = preg_replace('/[\\x00-\\x1F\\x7F]/', '', $url);
    $url = str_replace('"', '%22', $url);
    $encodedurl = preg_replace("/\\&(?![a-zA-Z0-9#]{1,8};)/", "&", $url);
    $encodedurl = preg_replace('/^.*href="([^"]*)".*$/', "\\1", clean_text('<a href="' . $encodedurl . '" />', FORMAT_HTML));
    $url = str_replace('&amp;', '&', $encodedurl);
    if (!empty($message)) {
        if ($delay === -1 || !is_numeric($delay)) {
            $delay = 3;
        }
        $message = clean_text($message);
    } else {
        $message = get_string('pageshouldredirect');
        $delay = 0;
    }
    // Make sure the session is closed properly, this prevents problems in IIS
    // and also some potential PHP shutdown issues.
    \core\session\manager::write_close();
    if ($delay == 0 && !$debugdisableredirect && !headers_sent()) {
        // 302 might not work for POST requests, 303 is ignored by obsolete clients.
        @header($_SERVER['SERVER_PROTOCOL'] . ' 303 See Other');
        @header('Location: ' . $url);
        echo bootstrap_renderer::plain_redirect_message($encodedurl);
        exit;
    }
    // Include a redirect message, even with a HTTP redirect, because that is recommended practice.
    if ($PAGE) {
        $CFG->docroot = false;
        // To prevent the link to moodle docs from being displayed on redirect page.
        echo $OUTPUT->redirect_message($encodedurl, $message, $delay, $debugdisableredirect);
        exit;
    } else {
        echo bootstrap_renderer::early_redirect_message($encodedurl, $message, $delay);
        exit;
    }
}

/**
 * Create CLI maintenance file to prevent all access.
 */
function tool_dbtransfer_create_maintenance_file()
{
    global $CFG;
    register_shutdown_function('tool_dbtransfer_maintenance_callback');
    $options = new stdClass();
    $options->trusted = false;
    $options->noclean = false;
    $options->smiley = false;
    $options->filter = false;
    $options->para = true;
    $options->newlines = false;
    $message = format_text(get_string('climigrationnotice', 'tool_dbtransfer'), FORMAT_MARKDOWN, $options);
    $message = bootstrap_renderer::early_error_content($message, '', '', array());
    $html = <<<OET
<!DOCTYPE html>
<html>
<header><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><header/>
<body>{$message}</body>
</html>
OET;
    file_put_contents("{$CFG->dataroot}/climaintenance.html", $html);
    @chmod("{$CFG->dataroot}/climaintenance.html", $CFG->filepermissions);
}

function cobalt_exception_handler($ex) {
    global $CFG, $DB, $OUTPUT, $USER, $FULLME, $SESSION, $PAGE;
    // detect active db transactions, rollback and log as error
    abort_all_db_transactions();
    $info = get_cobaltexception_info($ex);
    if (($ex instanceof required_capability_exception) && !CLI_SCRIPT && !AJAX_SCRIPT && !empty($CFG->autologinguests) && !empty($USER->autologinguest)) {
        $SESSION->wantsurl = qualified_me();
        redirect(get_login_url());
    }

    if (debugging('', DEBUG_MINIMAL)) {
        $logerrmsg = "Default exception handler: " . $info->message . ' Debug: ' . $info->debuginfo . "\n" . format_backtrace($info->backtrace, true);
        error_log($logerrmsg);
    }

    if (is_early_init($info->backtrace)) {
        echo bootstrap_renderer::early_error($info->message, $info->link, $info->backtrace, $info->debuginfo, $info->errorcode);
    } else {
        try {
            if ($DB) {
                // If you enable db debugging and exception is thrown, the print footer prints a lot of rubbish
                $DB->set_debug(0);
            }
            cobaltexception_format($ex);
        } catch (Exception $out_ex) {
            // default exception handler MUST not throw any exceptions!!
            // the problem here is we do not know if page already started or not, we only know that somebody messed up in outputlib or theme
            // so we just print at least something instead of "Exception thrown without a stack frame in Unknown on line 0":-(
            if (CLI_SCRIPT or AJAX_SCRIPT) {
                // just ignore the error and send something back using the safest method
                echo bootstrap_renderer::early_error($info->message, $info->link, $info->backtrace, $info->debuginfo, $info->errorcode);
            } else {
                echo bootstrap_renderer::early_error_content($info->message, $info->link, $info->backtrace, $info->debuginfo);
                $outinfo = get_exception_info($out_ex);
                echo bootstrap_renderer::early_error_content($outinfo->message, $outinfo->link, $outinfo->backtrace, $outinfo->debuginfo);
            }
        }
    }

    exit(1); // General error code
}

/**
 * Redirects the user to another page, after printing a notice
 *
 * This function calls the OUTPUT redirect method, echo's the output
 * and then dies to ensure nothing else happens.
 *
 * <strong>Good practice:</strong> You should call this method before starting page
 * output by using any of the OUTPUT methods.
 *
 * @param moodle_url $url A moodle_url to redirect to. Strings are not to be trusted!
 * @param string $message The message to display to the user
 * @param int $delay The delay before redirecting
 * @return void
 */
function redirect($url, $message = '', $delay = -1)
{
    global $OUTPUT, $SESSION, $CFG;
    if ($url instanceof moodle_url) {
        $url = $url->out(false, array(), false);
    }
    if (!empty($CFG->usesid) && !isset($_COOKIE[session_name()])) {
        $url = $SESSION->sid_process_url($url);
    }
    $lasterror = error_get_last();
    $debugdisableredirect = defined('DEBUGGING_PRINTED') || !empty($CFG->debugdisplay) && !empty($lasterror) && $lasterror['type'] & DEBUG_DEVELOPER;
    $usingmsg = false;
    if (!empty($message)) {
        if ($delay === -1 || !is_numeric($delay)) {
            $delay = 3;
        }
        $message = clean_text($message);
    } else {
        $message = get_string('pageshouldredirect');
        $delay = 0;
        // We are going to try to use a HTTP redirect, so we need a full URL.
        if (!preg_match('|^[a-z]+:|', $url)) {
            // Get host name http://www.wherever.com
            $hostpart = preg_replace('|^(.*?[^:/])/.*$|', '$1', $CFG->wwwroot);
            if (preg_match('|^/|', $url)) {
                // URLs beginning with / are relative to web server root so we just add them in
                $url = $hostpart . $url;
            } else {
                // URLs not beginning with / are relative to path of current script, so add that on.
                $url = $hostpart . preg_replace('|\\?.*$|', '', me()) . '/../' . $url;
            }
            // Replace all ..s
            while (true) {
                $newurl = preg_replace('|/(?!\\.\\.)[^/]*/\\.\\./|', '/', $url);
                if ($newurl == $url) {
                    break;
                }
                $url = $newurl;
            }
        }
    }
    if (defined('MDL_PERF') || (!empty($CFG->perfdebug) and $CFG->perfdebug > 7)) {
        if (defined('MDL_PERFTOLOG') && !function_exists('register_shutdown_function')) {
            $perf = get_performance_info();
            error_log("PERF: " . $perf['txt']);
        }
    }
    $encodedurl = preg_replace("/\\&(?![a-zA-Z0-9#]{1,8};)/", "&amp;", $url);
    $encodedurl = preg_replace('/^.*href="([^"]*)".*$/', "\\1", clean_text('<a href="' . $encodedurl . '" />'));
    if ($delay == 0 && !$debugdisableredirect && !headers_sent()) {
        //302 might not work for POST requests, 303 is ignored by obsolete clients.
        @header($_SERVER['SERVER_PROTOCOL'] . ' 303 See Other');
        @header('Location: ' . $url);
        echo bootstrap_renderer::plain_redirect_message($encodedurl);
        exit;
    }
    // Include a redirect message, even with a HTTP redirect, because that is recommended practice.
    $CFG->docroot = false;
    // to prevent the link to moodle docs from being displayed on redirect page.
    echo $OUTPUT->redirect_message($encodedurl, $message, $delay, $debugdisableredirect);
    exit;
}