CILogon\Service\Util

Complexity

Total Complexity

137

Size/Duplication

Total Lines	1191
Duplicated Lines	0 %

Coupling/Cohesion

Components	4
Dependencies	10

Test Coverage

Coverage

0%

Importance

Changes

0

36 Methods

Rating	Name	Duplication	Size	Complexity
A	getIdpList()	0	7	2
A	getCsrf()	0	7	2
A	getSkin()	0	7	2
A	getConfigVar()	0	13	4
A	startTiming()	0	4	1
A	getServerVar()	0	8	2
A	getGetVar()	0	8	2
A	getPostVar()	0	8	2
A	getGetOrPostVar()	0	8	2
A	getCookieVar()	0	8	2
A	setCookieVar()	0	8	2
A	unsetCookieVar()	0	5	1
A	getPortalOrNormalCookieVar()	0	12	2
A	getSessionVar()	0	8	2
A	setSessionVar()	0	13	3
A	unsetSessionVar()	0	7	2
A	removeShibCookies()	0	8	3
A	startPHPSession()	0	18	4
B	getScriptDir()	0	20	8
A	readArrayFromFile()	0	18	4
A	writeArrayToFile()	0	21	5
A	parseGridShibConf()	0	11	2
A	tempDir()	0	13	3
B	deleteDir()	0	21	7
A	htmlent()	0	4	1
B	sendErrorAlert()	0	55	4
B	getFirstAndLastName()	0	31	6
A	getHN()	0	8	2
A	getDN()	0	8	2
A	getAuthzUrl()	0	13	2
A	getAuthzIdP()	0	13	2
F	saveUserToDataStore()	0	212	44
A	unsetClientSessionVars()	0	21	1
A	unsetUserSessionVars()	0	32	1
A	unsetAllUserSessionVars()	0	5	1
A	verifySessionAndCall()	0	11	2

<?php

namespace CILogon\Service;

use CILogon\Service\CSRF;
use CILogon\Service\Loggit;
use CILogon\Service\IdpList;
use CILogon\Service\DBService;
use CILogon\Service\SessionMgr;
use CILogon\Service\Skin;
use CILogon\Service\TimeIt;
use CILogon\Service\PortalCookie;
use PEAR;
use Config;

// Full path to the php.ini-style config file for the CILogon Service
define('CILOGON_INI_FILE', '/var/www/config/cilogon.ini');

/**
 * Util
 *
 * This class contains a bunch of static (class) utility
 * methods, for example getting and setting server environment
 * variables and handling cookies. See the header for each function for
 * detailed description.
 */
class Util
{
    /**
     * @var array $ini_array Read the cilogon.ini file into an array
     */
    public static $ini_array = null;

    /**
     * @var TimeIt $timeit Initialize by calling static::startTiming() in
     * init().
     */
    public static $timeit;

    /**
     * @var IdPList $idplist A 'global' IdpList object since dplist.xml is
     *      large and expensive to create multiple times.
     */
    public static $idplist = null;

    /**
     * @var CSRF $csrf A 'global' CSRF token object to set the CSRF cookie
     * and print the hidden CSRF form element. Needs to be set only once
     * to keep the same CSRF value through the session.
     */
    public static $csrf = null;

    /**
     * @var Skin $skin A 'global' Skin object for skin configuration.
     */
    public static $skin = null;

    /**
     * @var array $oauth2idps An array of OAuth2 Identity Providers.
     */
    public static $oauth2idps = ['Google', 'GitHub', 'ORCID'];


    /**
     * getIdPList
     *
     * This function initializes the class $idplist object (if not yet
     * created) and returns it. This allows for a single 'global'
     * $idplist to be used by other classes (since creating an IdPList
     * object is expensive).
     *
     * @return IdPList The class instantiated IdPList object.
     **/
    public static function getIdpList()
    {
        if (is_null(static::$idplist)) {
            static::$idplist = new IdpList();
        }
        return static::$idplist;
    }

    /**
     * getCsrf
     *
     * This function initializes the class $csrf object (if not yet
     * created) and returns it. This allows for a single 'global'
     * $csrf to be used by other classes (since we want the CSRV value
     * to be consistent for the current page load).
     *
     * @return CSRF The class instantiated CSRF object.
     */
    public static function getCsrf()
    {
        if (is_null(static::$csrf)) {
            static::$csrf = new CSRF();
        }
        return static::$csrf;
    }

    /**
     * getSkin
     *
     * This function initializes the class $skin object (if not yet
     * created) and returns it. This allows for a single 'global'
     * $skin to be used by other classes (since loading the skin is
     * potentially expensive).
     *
     * @return The class instantiated Skin object.
     */
    public static function getSkin()
    {
        if (is_null(static::$skin)) {
            static::$skin = new Skin();
        }
        return static::$skin;
    }

    /**
     * getConfigVar
     *
     * This function returns a sinle configuration vale from the
     * CILOGON_INI_FILE, or empty string if no such configuration
     * value is found in the file.
     *
     * @param string $config The config parameter to read from the
     *        cilogon.ini file.
     * @return string The value of the config parameter, or empty string
     *         if no such parameter found in config.ini.
     */
    public static function getConfigVar($config)
    {
        $retval = '';
        // Read in the config file into an array
        if (is_null(static::$ini_array)) {
            static::$ini_array = @parse_ini_file(CILOGON_INI_FILE);
        }
        if ((is_array(static::$ini_array)) &&
            (array_key_exists($config, static::$ini_array))) {
            $retval = static::$ini_array[$config];
        }
        return $retval;
    }

    /**
     * startTiming
     *
     * This function initializes the class variable $timeit which is
     * used for timing/benchmarking purposes.
     */
    public static function startTiming()
    {
        static::$timeit = new TimeIt(TimeIt::DEFAULTFILENAME, true);
    }

    /**
     * getServerVar
     *
     * This function queries a given $_SERVER variable (which is set
     * by the Apache server) and returns the value.
     *
     * @param string $serv The $_SERVER variable to query.
     * @return string The value of the $_SERVER variable or empty string
     *         if that variable is not set.
     */
    public static function getServerVar($serv)
    {
        $retval = '';
        if (isset($_SERVER[$serv])) {
            $retval = $_SERVER[$serv];
        }
        return $retval;
    }

    /**
     * getGetVar
     *
     * This function queries a given $_GET parameter (which is set in
     * the URL via a '?parameter=value' parameter) and returns the
     * value.
     *
     * @param string $get The $_GET variable to query.
     * @return string The value of the $_GET variable or empty string if
     *         that variable is not set.
     */
    public static function getGetVar($get)
    {
        $retval = '';
        if (isset($_GET[$get])) {
            $retval = $_GET[$get];
        }
        return $retval;
    }

    /**
     * getPostVar
     *
     * This function queries a given $_POST variable (which is set when
     * the user submits a form, for example) and returns the value.
     *
     * @param string $post The $_POST variable to query.
     * @return string The value of the $_POST variable or empty string if
     *         that variable is not set.
     */
    public static function getPostVar($post)
    {
        $retval = '';
        if (isset($_POST[$post])) {
            $retval = $_POST[$post];
        }
        return $retval;
    }

    /**
     * getGetOrPostVar
     *
     * This function looks for a $_GET or $_POST variable, with
     * preference given to $_GET if both are present.
     *
     * @param string $var The $_GET or $_POST variable to query.
     * @return string The value of the $_GET or $_POST variable
     *         if present. Empty string if variable is not set.
     */
    public static function getGetOrPostVar($var)
    {
        $retval = static::getGetVar($var);
        if (empty($retval)) {
            $retval = static::getPostVar($var);
        }
        return $retval;
    }

    /**
     * getCookieVar
     *
     * This function returns the value of a given cookie.
     *
     * @param string $cookie he $_COOKIE variable to query.
     * @return string The value of the $_COOKIE variable or empty string
     *         if that variable is not set.
     */
    public static function getCookieVar($cookie)
    {
        $retval = '';
        if (isset($_COOKIE[$cookie])) {
            $retval = $_COOKIE[$cookie];
        }
        return $retval;
    }

    /**
     * setCookieVar
     *
     * This function sets a cookie.
     *
     * @param string $cookie The name of the cookie to set.
     * @param string $value (Optional) The value to set for the cookie.
     *        Defaults to empty string.
     * @param int $exp The future expiration time (in seconds) of the
     *        cookie. Defaults to 1 year from now. If set to 0,
     *        the cookie expires at the end of the session.
     */
    public static function setCookieVar($cookie, $value = '', $exp = 31536000)
    {
        if ($exp > 0) {
            $exp += time();
        }
        setcookie($cookie, $value, $exp, '/', '.'.static::getDN(), true);
        $_COOKIE[$cookie] = $value;
    }

    /**
     * unsetCookieVar
     *
     * This function unsets a cookie. Strictly speaking, the cookie is
     * not removed, rather it is set to an empty value with an expired
     * time.
     *
     * @param string $cookie The name of the cookie to unset (delete).
     */
    public static function unsetCookieVar($cookie)
    {
        setcookie($cookie, '', 1, '/', '.'.static::getDN(), true);
        unset($_COOKIE[$cookie]);
    }

    /**
     * getPortalOrNormalCookieVar
     *
     * This is a convenience function which first checks if there is a
     * OAuth 1.0a ('delegate') or OIDC ('authorize') session active.
     * If so, it attempts to get the requested cookie from the
     * associated portalcookie. If there is not an OAuth/OIDC session
     * active, it looks for a 'normal' cookie. If you need a
     * portalcookie object to do multiple get/set method calls from
     * one function, it is probably better NOT to use this method since
     * creating the portalcookie object is potentially expensive.
     *
     * @param string $cookie The name of the cookie to get.
     * @return string The cookie value from either the portalcookie
     *         (in the case of an active OAuth session) or the
     *         'normal' cookie. Return empty string if no matching
     *         cookie in either place.
     */
    public static function getPortalOrNormalCookieVar($cookie)
    {
        $retval = '';

$retval is not used, you could remove the assignment.

        $pc = new PortalCookie();
        $pn = $pc->getPortalName();
        if (strlen($pn) > 0) {
            $retval = $pc->get($cookie);
        } else {
            $retval = static::getCookieVar($cookie);
        }
        return $retval;
    }

    /**
     * getSessionVar
     *
     * This function returns the value of a given PHP Session variable.
     *
     * @param string $sess The $_SESSION variable to query.
     * @return string The value of the $_SESSION variable or empty string
     *         if that variable is not set.
     */
    public static function getSessionVar($sess)
    {
        $retval = '';
        if (isset($_SESSION[$sess])) {
            $retval = $_SESSION[$sess];
        }
        return $retval;
    }

    /**
     * setSessionVar
     *
     * This function can set or unset a given PHP session variable.
     * The first parameter is the PHP session variable to set/unset.
     * If the second parameter is the empty string, then the session
     * variable is unset.  Otherwise, the session variable is set to
     * the second parameter.  The function returns true if the session
     * variable was set to a non-empty value, false otherwise.
     * Normally, the return value can be ignored.
     *
     * @param string $key The name of the PHP session variable to set
     *        (or unset).
     * @param string $value (Optional) The value of the PHP session variable
     *        (to set), or empty string (to unset). Defaults to empty
     *        string (implies unset the session variable).
     * @return bool True if the PHP session variable was set to a
     *         non-empty string, false if variable was unset or if
     *         the specified session variable was not previously set.
     */
    public static function setSessionVar($key, $value = '')
    {
        $retval = false;  // Assume we want to unset the session variable
        if (strlen($key) > 0) {  // Make sure session var name was passed in
            if (strlen($value) > 0) {
                $_SESSION[$key] = $value;
                $retval = true;
            } else {
                static::unsetSessionVar($key);
            }
        }
        return $retval;
    }

    /**
     * unsetSessionVar
     *
     * This function clears the given PHP session variable by first
     * setting it to null and then unsetting it entirely.
     *
     * @param string $sess The $_SESSION variable to erase.
     */
    public static function unsetSessionVar($sess)
    {
        if (isset($_SESSION[$sess])) {
            $_SESSION[$sess] = null;
            unset($_SESSION[$sess]);
        }
    }

    /**
     * removeShibCookies
     *
     * This function removes all '_shib*' cookies currently in the
     * user's browser session. In effect, this logs the user out of
     * any IdP. Note that you must call this before you output any
     * HTML. Strictly speaking, the cookies are not removed, rather
     * they are set to empty values with expired times.
     */
    public static function removeShibCookies()
    {
        while (list($key, $val) = each($_COOKIE)) {

The assignment to $val is unused. Consider omitting it like so list($first,,$third).

            if (strncmp($key, '_shib', strlen('_shib')) == 0) {
                static::unsetCookieVar($key);
            }
        }
    }

    /**
     * startPHPSession
     *
     * This function starts a secure PHP session and should be called
     * at the beginning of each script before any HTML is output.  It
     * does a trick of setting a 'lastaccess' time so that the
     * $_SESSION variable does not expire without warning.
     *
     * @param string $storetype (Optional) Storage location of the PHP
     *        session data, one of 'file' or 'mysql'. Defaults to null,
     *        which means use the value of storage.phpsessions from the
     *        cilogon.ini config file, or 'file' if no such
     *        parameter configured.
     */
    public static function startPHPSession($storetype = null)

The parameter $storetype is not used and could be removed.

    {
        // No parameter given? Use the value read in from cilogon.ini file.
        // If storage.phpsessions == 'mysql', create a sessionmgr().
        $storetype = static::getConfigVar('storage.phpsessions');

        if (preg_match('/^mysql/', $storetype)) {
            $sessionmgr = new SessionMgr();

$sessionmgr is not used, you could remove the assignment.

        }

        ini_set('session.cookie_secure', true);
        ini_set('session.cookie_domain', '.'.static::getDN());
        session_start();
        if ((!isset($_SESSION['lastaccess']) ||
            (time() - $_SESSION['lastaccess']) > 60)) {
            $_SESSION['lastaccess'] = time();
        }
    }

    /**
     * getScriptDir
     *
     * This function returns the directory (or full url) of the script
     * that is currently running.  The returned directory/url is
     * terminated by a '/' character (unless the second parameter is
     * set to true). This function is useful for those scripts named
     * index.php where we don't want to actually see 'index.php' in the
     * address bar (again, unless the second parameter is set to true).
     *
     * @param bool $prependhttp (Optional) Boolean to prepend 'http(s)://' to
     *        the script name. Defaults to false.
     * @param bool $stripfile (Optional) Boolean to strip off the trailing
     *        filename (e.g. index.php) from the path.
     *        Defaults to true (i.e., defaults to directory
     *        only without the trailing filename).
     * @return string The directory or url of the current script, with or
     *         without the trailing .php filename.
     */
    public static function getScriptDir($prependhttp = false, $stripfile = true)
    {
        $retval = static::getServerVar('SCRIPT_NAME');
        if ($stripfile) {
            $retval = dirname($retval);
        }
        if ($retval == '.') {
            $retval = '';
        }
        if ((strlen($retval) == 0) ||
            ($stripfile && ($retval[strlen($retval)-1] != '/'))) {
            $retval .= '/';  // Append a slash if necessary
        }
        if ($prependhttp) {  // Prepend http(s)://hostname
            $retval = 'http' .
                      ((strtolower(static::getServerVar('HTTPS')) == 'on')?'s':'') .
                      '://' . static::getServerVar('HTTP_HOST') . $retval;
        }
        return $retval;
    }

    /**
     * readArrayFromFile
     *
     * This function reads in the contents of a file into an array. It
     * is assumed that the file contains lines of the form:
     *     key value
     * where 'key' and 'value' are separated by whitespace.  The 'key'
     * portion of the string may not contain any whitespace, but the
     * 'value' part of the line may contain whitespace. Any empty lines
     * or lines starting with '#' (comments, without leading spaces)
     * in the file are skipped.  Note that this assumes that each 'key'
     * in the file is unique.  If there is any problem reading the
     * file, the resulting array will be empty.
     *
     * @param string $filename The name of the file to read.
     * @return array An array containing the contents of the file.
     */
    public static function readArrayFromFile($filename)
    {
        $retarray = array();
        if (is_readable($filename)) {
            $lines = file(
                $filename,
                FILE_IGNORE_NEW_LINES|FILE_SKIP_EMPTY_LINES
            );
            foreach ($lines as $line) {
                if (substr($line, 0, 1) != '#') { // Skip '#' comment lines
                    $values = preg_split('/\s+/', $line, 2);
                    $retarray[$values[0]] = @$values[1];
                }
            }
        }

        return $retarray;
    }

    /**
     * writeArrayToFile
     *
     * This funtion writes an array (with key=>value pairs) to a file,
     * each line will be of the form:
     *     key value
     * The 'key' and 'value' strings are separated by a space. Note
     * that a 'key' may not contain any whitespace (e.g. tabs), but a
     * 'value' may contain whitespace. To be super safe, the array is
     * first written to a temporary file, which is then renamed to the
     * final desired filename.
     *
     * @param string $filename The name of the file to write.
     * @param array $thearray The array to be written to the file.
     * @return bool True if successfully wrote file, false otherwise.
     */
    public static function writeArrayToFile($filename, $thearray)
    {
        $retval = false;  // Assume write failed
        $tmpfnmae = tempnam('/tmp', 'ARR');

$tmpfnmae is not used, you could remove the assignment.

        if ($fh = fopen($tmpfname, 'w')) {
            if (flock($fh, LOCK_EX)) {
                foreach ($thearray as $key => $value) {
                    fwrite($fh, "$key $value\n");
                }
                flock($fh, LOCK_UN);
            }
            fclose($fh);
            if (@rename($tmpfname, $filename)) {
                $retval = true;
            } else {
                @unlink($tmpfname);

The variable $tmpfname does not exist. Did you forget to declare it?

It seems like you do not handle an error condition here. This can introduce security issues, and is generally not recommended.

            }
        }

        return $retval;
    }

    /**
     * parseGridShibConf
     *
     * This function parses the gridshib-ca.conf file and returns an
     * array containing the various options. It uses the PHP
     * PEAR::Config package to parse the config file. The
     * gridshib-ca.conf file is MOSTLY an Apache-style config file.
     * However, each option has an extra ' = ' prepended, so you will
     * need to strip these off each config option. For example, to get
     * the 'MaximumCredLifetime' value which is in the 'CA' section,
     * you would do the following:
     *     $gridshibconf = Util::parseGridShibConf();
     *     $life = preg_replace('%^\s*=\s*%','',
     *             $gridshibconf['root']['CA']['MaximumCredLifetime']);
     *
     * @param string $conffile (Optional) Full path location of
     *        gridshib-ca.conf file. Defaults to
     *        '/usr/local/gridshib-ca/conf/gridshib-ca.conf'.
     * @return array An array containing the various configuration
     *         parameters in the gridshib-ca.conf file.
     */
    public static function parseGridShibConf(
        $conffile = '/usr/local/gridshib-ca/conf/gridshib-ca.conf'
    ) {
        $conf = new Config;
        $root = $conf->parseConfig($conffile, 'Apache');
        $gridshibconf = array();
        if (!(PEAR::isError($root))) {
            $gridshibconf = $root->toArray();
        }
        return $gridshibconf;
    }

    /**
     * tempDir
     *
     * This function creates a temporary subdirectory within the
     * specified subdirectory. The new directory name is composed of
     * 16 hexadecimal letters, plus any prefix if you specify one. The
     * full path of the the newly created directory is returned.
     *
     * @param string $dir The full path to the containing directory.
     * @param string $prefix (Optional) A prefix for the new temporary
     *        directory. Defaults to empty string.
     * @param int $mode (Optional) Access permissions for the new
     *        temporary directory. Defaults to 0775.
     * @return string Full path to the newly created temporary directory.
     */
    public static function tempDir($dir, $prefix = '', $mode = 0775)
    {
        if (substr($dir, -1) != '/') {
            $dir .= '/';
        }

        $path = '';

$path is not used, you could remove the assignment.

        do {
            $path = $dir . $prefix . sprintf("%08X%08X", mt_rand(), mt_rand());
        } while (!mkdir($path, $mode, true));

        return $path;
    }

    /**
     * deleteDir
     *
     * This function deletes a directory and all of its contents.
     *
     * @param string $dir The (possibly non-empty) directory to delete.
     * @param bool $shred (Optional) Shred the file before deleting?
     *        Defaults to false.
     */
    public static function deleteDir($dir, $shred = false)
    {
        if (is_dir($dir)) {
            $objects = scandir($dir);
            foreach ($objects as $object) {
                if ($object != "." && $object != "..") {
                    if (filetype($dir."/".$object) == "dir") {
                        static::deleteDir($dir."/".$object);
                    } else {
                        if ($shred) {
                            @exec('/bin/env /usr/bin/shred -u -z '.$dir."/".$object);

It seems like you do not handle an error condition here. This can introduce security issues, and is generally not recommended.

                        } else {
                            @unlink($dir."/".$object);

It seems like you do not handle an error condition here. This can introduce security issues, and is generally not recommended.

                        }
                    }
                }
            }
            reset($objects);
            @rmdir($dir);

It seems like you do not handle an error condition here. This can introduce security issues, and is generally not recommended.

        }
    }

    /**
     * htmlent
     *
     * This method is necessary since htmlentities() does not seem to
     * obey the default arguments as documented in the PHP manual, and
     * instead encodes accented characters incorrectly. By specifying
     * the flags and encoding, the problem is solved.
     *
     * @param string $str : A string to process with htmlentities().
     * @return string The input string processed by htmlentities with
     *         specific options.
     */
    public static function htmlent($str)
    {
        return htmlentities($str, ENT_COMPAT|ENT_HTML401, 'UTF-8');
    }

    /**
     * sendErrorAlert
     *
     * Use this function to send an error message. The $summary should
     * be a short description of the error since it is placed in the
     * subject of the email. Put a more verbose description of the
     * error in the $detail parameter. Any session variables available
     * are appended to the body of the message.
     *
     * @param string $summary A brief summary of the error (in email subject)
     * @param string $detail A detailed description of the error (in the
     *        email body)
     * @param string $mailto (Optional) The destination email address.
     *        Defaults to 'alerts@cilogon.org'.
     */
    public static function sendErrorAlert(
        $summary,
        $detail,
        $mailto = 'alerts@cilogon.org'
    ) {
        $sessionvars = array(
            'idp'          => 'IdP ID',
            'idpname'      => 'IdP Name',
            'uid'          => 'Database UID',
            'dn'           => 'Cert DN',
            'firstname'    => 'First Name',
            'lastname'     => 'Last Name',
            'displayname'  => 'Display Name',
            'ePPN'         => 'ePPN',
            'ePTID'        => 'ePTID',
            'openID'       => 'OpenID ID',
            'oidcID'       => 'OIDC ID',
            'loa'          => 'LOA',
            'affiliation'  => 'Affiliation',
            'ou'           => 'OU',
            'memberof'     => 'MemberOf',
            'acr'          => 'AuthnContextClassRef',
            'entitlement'  => 'Entitlement',
            'cilogon_skin' => 'Skin Name',
            'twofactor'    => 'Two-Factor',
            'authntime'    => 'Authn Time'
        );

        $remoteaddr = static::getServerVar('REMOTE_ADDR');
        $remotehost = gethostbyaddr($remoteaddr);
        $mailfrom = 'From: alerts@cilogon.org' . "\r\n" .
                    'X-Mailer: PHP/' . phpversion();
        $mailsubj = 'CILogon Service on ' . php_uname('n') .
                    ' - ' . $summary;
        $mailmsg  = '
CILogon Service - ' . $summary . '
-----------------------------------------------------------
' . $detail . '

Session Variables
-----------------
Timestamp     = ' . date(DATE_ATOM) . '
Server Host   = ' . static::getHN() . '
Remote Address= ' . $remoteaddr . '
' . (($remotehost !== false) ? "Remote Host   = $remotehost" : '') . '
';

        foreach ($sessionvars as $svar => $sname) {
            if (strlen($val = static::getSessionVar($svar)) > 0) {
                $mailmsg .= sprintf("%-14s= %s\n", $sname, $val);
            }
        }

        mail($mailto, $mailsubj, $mailmsg, $mailfrom);
    }

    /**
     * getFirstAndLastName
     *
     * This function attempts to get the first and last name of a user
     * extracted from the 'full name' (displayName) of the user.
     * Simply pass in all name info (full, first, and last) and the
     * function first tries to break up the full name into first/last.
     * If this is not sufficient, the function checks first and last
     * name. Finally, if either first or last is blank, the function
     * duplicates first <=> last so both names have the same value.
     * Note that even with all this, you still need to check if the
     * returned (first,last) names are blank.
     *
     * @param string $full The 'full name' of the user
     * @param string $first (Optional) The 'first name' of the user
     * @param string $last (Optional) The 'last name' of the user
     * @return array An array 'list(firstname,lastname)'
     */
    public static function getFirstAndLastName($full, $first = '', $last = '')
    {
        $firstname = '';
        $lastname = '';

        # Try to split the incoming $full name into first and last names
        if (strlen($full) > 0) {
            $names = preg_split('/\s+/', $full, 2);
            $firstname = @$names[0];
            $lastname =  @$names[1];
        }

        # If either first or last name blank, then use incoming $first and $last
        if (strlen($firstname) == 0) {
            $firstname = $first;
        }
        if (strlen($lastname) == 0) {
            $lastname = $last;
        }

        # Finally, if only a single name, copy first name <=> last name
        if (strlen($lastname) == 0) {
            $lastname = $firstname;
        }
        if (strlen($firstname) == 0) {
            $firstname = $lastname;
        }

        # Return both names as an array (i.e., use list($first,last)=...)
        return array($firstname,$lastname);
    }

    /**
     * getHN
     *
     * This function calculates and returns the 'hostname' for the
     * server. It first checks HTTP_HOST. If not set, it returns
     * 'cilogon.org'. This is needed by command line scripts.
     *
     * @return string The 'Hostname' for the web server.
     */
    public static function getHN()
    {
        $thehostname = static::getServerVar('HTTP_HOST');
        if (strlen($thehostname) == 0) {
            $thehostname = 'cilogon.org';
        }
        return $thehostname;
    }

    /**
     * getDN
     *
     * This function calculates and returns the 'domainname' for the
     * server. It uses the hostname value calculated by getHN() and
     * uses the last two segments.
     *
     * @return string The 'Domainname' for the web server.
     */
    public static function getDN()
    {
        $thedomainname = static::getHN();
        if (preg_match('/[^\.]+\.[^\.]+$/', $thedomainname, $matches)) {
            $thedomainname = $matches[0];
        }
        return $thedomainname;
    }

    /**
     * getAuthzUrl
     *
     * This funtion takes in the name of an IdP (e.g., 'Google') and
     * returns the assoicated OAuth2 authorization URL.
     *
     * @param string $idp The name of an OAuth2 Identity Provider.
     * @return string The authorization URL for the given IdP.
     */
    public static function getAuthzUrl($idp)
    {
        $url = null;
        $idptourl = array(
            'Google' => 'https://accounts.google.com/o/oauth2/auth',
            'GitHub' => 'https://github.com/login/oauth/authorize',
            'ORCID'  => 'https://orcid.org/oauth/authorize',
        );
        if (array_key_exists($idp, $idptourl)) {
            $url = $idptourl[$idp];
        }
        return $url;
    }

    /**
     * getAuthzIdP
     *
     * This function takes in the OAuth2 authorization URL and returns
     * the associated pretty-print name of the IdP.
     *
     * @param string $url The authorization URL of an OAuth2 Identity Provider.
     * @return string The name of the IdP.
     */
    public static function getAuthzIdP($url)
    {
        $idp = null;
        $urltoidp = array(
            'https://accounts.google.com/o/oauth2/auth' => 'Google',
            'https://github.com/login/oauth/authorize'  => 'GitHub',
            'https://orcid.org/oauth/authorize'         => 'ORCID',
        );
        if (array_key_exists($url, $urltoidp)) {
            $idp = $urltoidp[$url];
        }
        return $idp;
    }

    /**
     * saveUserToDataStore
     *
     * This function is called when a user logs on to save identity
     * information to the datastore. As it is used by both Shibboleth
     * and OpenID Identity Providers, some parameters passed in may
     * be blank (empty string). The function verifies that the minimal
     * sets of parameters are valid, the dbservice servlet is called
     * to save the user info. Then various session variables are set
     * for use by the program later on. In case of error, an email
     * alert is sent showing the missing parameters.
     *
     * @param string $remoteuser The REMOTE_USER from HTTP headers
     * @param string $providerId The provider IdP Identifier / URL endpoint
     * @param string providerName The pretty print provider IdP name
     * @param string $firstname The user's first name
     * @param string $lastname The user's last name
     * @param string $displayname The user's display name
     * @param string $emailaddr The user's email address
     * @param string $loa The level of assurance (e.g., openid/basic/silver)
     * @param string $eppn (optional) User's ePPN (for SAML IdPs)
     * @param string $eptid (optional) User's ePTID (for SAML IdPs)
     * @param string $openidid (optional) User's OpenID 2.0 Identifier
     * @param string $oidcid (optional) User's OpenID Connect Identifier
     * @param string $affiliation (optional) User's affiliation
     * @param string $ou (optional) User's organizational unit (OU)
     * @param string $memberof (optional) User's isMemberOf group info
     * @param string $acr (optional) Authentication Context Class Ref
     * @param string $entitlement (optional) User's entitlement
     */
    public static function saveUserToDataStore(
        $remoteuser,
        $providerId,
        $providerName,
        $firstname,
        $lastname,
        $displayname,
        $emailaddr,
        $loa,
        $eppn = '',
        $eptid = '',
        $openidid = '',
        $oidcid = '',
        $affiliation = '',
        $ou = '',
        $memberof = '',
        $acr = '',
        $entitlement = ''
    ) {
        $dbs = new DBService();

        // Keep original values of providerName and providerId
        $databaseProviderName = $providerName;
        $databaseProviderId   = $providerId;

        // Save the passed-in variables to the session for later use
        // (e.g., by the error handler in handleGotUser).
        static::setSessionVar('firstname', $firstname);
        static::setSessionVar('lastname', $lastname);
        static::setSessionVar('displayname', $displayname);
        static::setSessionvar('emailaddr', $emailaddr);
        static::setSessionVar('loa', $loa);
        static::setSessionVar('ePPN', $eppn);
        static::setSessionVar('ePTID', $eptid);
        static::setSessionVar('openidID', $openidid);
        static::setSessionVar('oidcID', $oidcid);
        static::setSessionVar('affiliation', $affiliation);
        static::setSessionVar('ou', $ou);
        static::setSessionVar('memberof', $memberof);
        static::setSessionVar('acr', $acr);
        static::setSessionVar('entitlement', $entitlement);
        static::setSessionVar('idp', $providerId); // Enable error message
        static::setSessionVar('idpname', $providerName); // Enable check for Google
        static::setSessionVar('submit', static::getSessionVar('responsesubmit'));

        // CACC-238 - Set loa to "silver" if the following are true:
        // (1) loa contains  https://refeds.org/assurance/profile/cappuccino
        // (2) acr is either https://refeds.org/profile/sfa or
        //                   https://refeds.org/profile/mfa
        if ((preg_match('%https://refeds.org/assurance/profile/cappuccino%', $loa)) &&
            (preg_match('%https://refeds.org/profile/[ms]fa%', $acr))) {
            $loa = 'http://incommonfederation.org/assurance/silver';
            static::setSessionVar('loa', $loa);
        }

        // Make sure parameters are not empty strings, and email is valid
        // Must have at least one of remoteuser/eppn/eptid/openidid/oidcid
        if (((strlen($remoteuser) > 0) ||
               (strlen($eppn) > 0) ||
               (strlen($eptid) > 0) ||
               (strlen($openidid) > 0) ||
               (strlen($oidcid) > 0)) &&
            (strlen($databaseProviderId) > 0) &&
            (strlen($databaseProviderName) > 0)  &&
            (strlen($firstname) > 0) &&
            (strlen($lastname) > 0) &&
            (strlen($emailaddr) > 0) &&
            (filter_var($emailaddr, FILTER_VALIDATE_EMAIL))) {
            // For the new Google OAuth 2.0 endpoint, we want to keep the
            // old Google OpenID endpoint URL in the database (so user does
            // not get a new certificate subject DN). Change the providerId
            // and providerName to the old Google OpenID values.
            if (($databaseProviderName == 'Google+') ||
                ($databaseProviderId == static::getAuthzUrl('Google'))) {
                $databaseProviderName = 'Google';
                $databaseProviderId = 'https://www.google.com/accounts/o8/id';
            }

            // In the database, keep a consistent ProviderId format: only
            // allow 'http' (not 'https') and remove any 'www.' prefix.
            if ($loa == 'openid') {
                $databaseProviderId = preg_replace(
                    '%^https://(www\.)?%',
                    'http://',
                    $databaseProviderId
                );
            }

            $result = $dbs->getUser(
                $remoteuser,
                $databaseProviderId,
                $databaseProviderName,
                $firstname,
                $lastname,
                $displayname,
                $emailaddr,
                $eppn,
                $eptid,
                $openidid,
                $oidcid,
                $affiliation,
                $ou,
                $memberof,
                $acr,
                $entitlement
            );
            static::setSessionVar('uid', $dbs->user_uid);
            static::setSessionVar('dn', $dbs->distinguished_name);
            static::setSessionVar('twofactor', $dbs->two_factor);
            static::setSessionVar('status', $dbs->status);
            if (!$result) {
                static::sendErrorAlert(
                    'dbService Error',
                    'Error calling dbservice action "getUser" in ' .
                    'saveUserToDatastore() method.'
                );
            }
        } else { // Missing one or more required attributes
            static::setSessionVar(
                'status',
                DBService::$STATUS['STATUS_MISSING_PARAMETER_ERROR']
            );
        }

        // If 'status' is not STATUS_OK*, then send an error email
        $status = static::getSessionVar('status');
        if ($status & 1) { // Bad status codes are odd
            // For missing parameter errors, log an error message
            if ($status ==
                DBService::$STATUS['STATUS_MISSING_PARAMETER_ERROR']) {
                $log = new Loggit();
                $log->error('STATUS_MISSING_PARAMETER_ERROR', true);
            }

            // For other dbservice errors OR for any error involving
            // LIGO (e.g., missing parameter error), send email alert.
            if (($status !=
                    DBService::$STATUS['STATUS_MISSING_PARAMETER_ERROR']) ||
                (preg_match('/ligo\.org/', $databaseProviderId))) {
                $mailto = 'alerts@cilogon.org';

                // Set $disableligoalerts = true to stop LIGO failures
                // from being sent to 'alerts@cilogon.org', but still
                // sent to 'cilogon-alerts@ligo.org'.
                $disableligoalerts = false;

                // Fixes CIL-205 - Notify LIGO about IdP login errors
                if (preg_match('/ligo\.org/', $databaseProviderId)) {
                    if ($disableligoalerts) {
                        $mailto = '';
                    }
                    $mailto .= ((strlen($mailto) > 0) ? ',' : '') .
                        'cilogon-alerts@ligo.org';
                }

                static::sendErrorAlert(
                    'Failure in ' .
                        (($loa == 'openid') ? '' : '/secure') . '/getuser/',
                    'Remote_User   = ' . ((strlen($remoteuser) > 0) ?
                        $remoteuser : '<MISSING>') . "\n" .
                    'IdP ID        = ' . ((strlen($databaseProviderId) > 0) ?
                        $databaseProviderId : '<MISSING>') . "\n" .
                    'IdP Name      = ' . ((strlen($databaseProviderName) > 0) ?
                        $databaseProviderName : '<MISSING>') . "\n" .
                    'First Name    = ' . ((strlen($firstname) > 0) ?
                        $firstname : '<MISSING>') . "\n" .
                    'Last Name     = ' . ((strlen($lastname) > 0) ?
                        $lastname : '<MISSING>') . "\n" .
                    'Display Name  = ' . ((strlen($displayname) > 0) ?
                        $displayname : '<MISSING>') . "\n" .
                    'Email Address = ' . ((strlen($emailaddr) > 0) ?
                        $emailaddr : '<MISSING>') . "\n" .
                    'ePPN          = ' . ((strlen($eppn) > 0) ?
                        $eppn : '<MISSING>') . "\n" .
                    'ePTID         = ' . ((strlen($eptid) > 0) ?
                        $eptid : '<MISSING>') . "\n" .
                    'OpenID ID     = ' . ((strlen($openidid) > 0) ?
                        $openidid : '<MISSING>') . "\n" .
                    'OIDC ID       = ' . ((strlen($oidcid) > 0) ?
                        $oidcid : '<MISSING>') . "\n" .
                    'Affiliation   = ' . ((strlen($affiliation) > 0) ?
                        $affiliation : '<MISSING>') . "\n" .
                    'OU            = ' . ((strlen($ou) > 0) ?
                        $ou : '<MISSING>') . "\n" .
                    'MemberOf      = ' . ((strlen($memberof) > 0) ?
                        $memberof : '<MISSING>') . "\n" .
                    'ACR           = ' . ((strlen($acr) > 0) ?
                        $acr : '<MISSING>') . "\n" .
                    'Entitlement   = ' . ((strlen($entitlement) > 0) ?
                        $entitlement : '<MISSING>') . "\n" .
                    'Database UID  = ' . ((strlen(
                        $i = static::getSessionVar('uid')
                    ) > 0) ?  $i : '<MISSING>') . "\n" .
                    'Status Code   = ' . ((strlen(
                        $i = array_search(
                            $status,
                            DBService::$STATUS
                        )
                    ) > 0) ?  $i : '<MISSING>'),
                    $mailto
                );
            }
            static::unsetSessionVar('authntime');
        } else { // status is okay, set authntime
            static::setSessionVar('authntime', time());
        }

        static::unsetSessionVar('responsesubmit');
        static::unsetSessionVar('requestsilver');

        static::getCsrf()->setCookieAndSession();
    }

    /**
     * unsetClientSessionVars
     *
     * This function removes all of the PHP session variables related to
     * the client session.
     */
    public static function unsetClientSessionVars()
    {
        static::unsetSessionVar('submit');

        // Specific to 'Download Certificate' page
        static::unsetSessionVar('activation');
        static::unsetSessionVar('p12');
        static::unsetSessionVar('p12lifetime');
        static::unsetSessionVar('p12multiplier');

        // Specific to OAuth 1.0a flow
        static::unsetSessionVar('portalstatus');
        static::unsetSessionVar('callbackuri');
        static::unsetSessionVar('successuri');
        static::unsetSessionVar('failureuri');
        static::unsetSessionVar('portalname');
        static::unsetSessionVar('tempcred');

        // Specific to OIDC flow
        static::unsetSessionVar('clientparams');
    }

    /**
     * unsetUserSessionVars
     *
     * This function removes all of the PHP session variables related to
     * the user's session.  This will force the user to log on (again)
     * with their IdP and call the 'getuser' script to repopulate the PHP
     * session.
     */
    public static function unsetUserSessionVars()
    {
        // Needed for verifyCurrentUserSession
        static::unsetSessionVar('idp');
        static::unsetSessionVar('idpname');
        static::unsetSessionVar('status');
        static::unsetSessionVar('uid');
        static::unsetSessionVar('dn');
        static::unsetSessionVar('authntime');

        // Specific to 2FA
        static::unsetSessionVar('twofactor');

        // Variables set by getuser
        static::unsetSessionVar('firstname');
        static::unsetSessionVar('lastname');
        static::unsetSessionVar('displayname');
        static::unsetSessionVar('emailaddr');
        static::unsetSessionVar('loa');
        static::unsetSessionVar('ePPN');
        static::unsetSessionVar('ePTID');
        static::unsetSessionVar('openidID');
        static::unsetSessionVar('oidcID');
        static::unsetSessionVar('affiliation');
        static::unsetSessionVar('ou');
        static::unsetSessionVar('memberof');
        static::unsetSessionVar('acr');
        static::unsetSessionVar('entitlement');

        // Current skin
        static::unsetSessionVar('cilogon_skin');
    }

    /**
     * unsetAllUserSessionVars
     *
     * This is a convenience method to clear all session variables related
     * to the client and the user.
     */
    public static function unsetAllUserSessionVars()
    {
        static::unsetClientSessionVars();
        static::unsetUserSessionVars();
    }

    /**
     * verifySessionAndCall
     *
     * This function is a convenience method called by several cases in the
     * main 'switch' call at the top of the index.php file. I noticed
     * a pattern where verifyCurrentUserSession() was called to verify the
     * current user session. Upon success, one or two functions were called
     * to continue program, flow. Upon failure, cookies and session
     * variables were cleared, and the main Logon page was printed. This
     * function encapsulates that pattern. If the user's session is valid,
     * the passed-in $func is called, possibly with parameters passed in as
     * an array. The function returns true if the session is verified, so
     * that other functions may be called upon return.
     *
     * @param function $func The function to call if the current session is
     *        successfully verified.
     * @param array $params (Optional) An array of parameters to pass to the
     8        function. Defaults to empty array, meaning zero parameters.
     */
    public static function verifySessionAndCall($func, $params = array())
    {
        $retval = false;
        if (Content::verifyCurrentUserSession()) { // Verify PHP session is valid
            $retval = true;
            call_user_func_array($func, $params);
        } else {
            printLogonPage(true); // Clear cookies and session vars too
        }
        return $retval;
    }
}