/**
* Given a user's chosen nickname, generate their unixusername.
* This is done by:
* - lowercasing their nickname
* - stripping non-alphanumeric
* - verifying uniqueness in passwd file & user table
* - if not unique, append a number :/
* (not the greatest, but it can be changed later)
*
*/
public function generateUnixUsername($nickname)
{
// lowercase
$unixname = strtolower($nickname);
// find alphanumeric-only parts to use as unixname
$disallowed_characters = "/[^a-z0-9]/";
$unixname = preg_replace($disallowed_characters, "", $unixname);
// make sure first character is alpha character (can't start w/ a #)
if (preg_match("/^[a-z]/", $unixname) == 0) {
// lets not be fancy.. just prepend an "a" to their name.
$unixname = "a" . $unixname;
}
// append numbers to the end of the name if it's not unique
// to both the password file AND the user table
// Test SanboxUtil last since that could be a remote call
$attempted_unixname = $unixname;
$x = 0;
while (User::unixusernameExists($attempted_unixname) || SandBoxUtil::inPasswdFile($attempted_unixname)) {
$x++;
$attempted_unixname = $unixname . $x;
}
$unixname = $attempted_unixname;
return $unixname;
}
