function detect_math($r, &$out)
{
$out .= $r->h2('Math support');
$ext = Auth_OpenID_detectMathLibrary(Auth_OpenID_math_extensions());
if (!isset($ext['extension']) || !isset($ext['class'])) {
$out .= $r->p('Your PHP installation does not include big integer math ' . 'support. This support is required if you wish to run a ' . 'secure OpenID server without using SSL.');
$out .= $r->p('To use this library, you have a few options:');
$gmp_lnk = $r->link('http://www.php.net/manual/en/ref.gmp.php', 'GMP');
$bc_lnk = $r->link('http://www.php.net/manual/en/ref.bc.php', 'bcmath');
$out .= $r->ol(array('Install the ' . $gmp_lnk . ' PHP extension', 'Install the ' . $bc_lnk . ' PHP extension', 'If your site is low-security, call ' . 'Auth_OpenID_setNoMathSupport(), defined in Auth/OpenID/BigMath.php. ', 'The library will function, but ' . 'the security of your OpenID server will depend on the ' . 'security of the network links involved. If you are only ' . 'using consumer support, you should still be able to operate ' . 'securely when the users are communicating with a ' . 'well-implemented server.'));
return false;
} else {
switch ($ext['extension']) {
case 'bcmath':
$out .= $r->p('Your PHP installation has bcmath support. This is ' . 'adequate for small-scale use, but can be CPU-intensive. ' . 'You may want to look into installing the GMP extension.');
$lnk = $r->link('http://www.php.net/manual/en/ref.gmp.php');
$out .= $r->p('See ' . $lnk . ' for more information ' . 'about the GMP extension.');
break;
case 'gmp':
$out .= $r->p('Your PHP installation has gmp support. Good.');
break;
default:
$class = $ext['class'];
$lib = new $class();
$one = $lib->init(1);
$two = $lib->add($one, $one);
$t = $lib->toString($two);
$out .= $r->p('Uh-oh. I do not know about the ' . $ext['extension'] . ' extension!');
if ($t != '2') {
$out .= $r->p('It looks like it is broken. 1 + 1 = ' . var_export($t, false));
return false;
} else {
$out .= $r->p('But it seems to be able to add one and one.');
}
}
return true;
// Math library is OK
}
}
/**
* {@link Auth_OpenID_getMathLib} checks for the presence of long
* number extension modules and returns an instance of
* {@link Auth_OpenID_MathWrapper} which exposes the module's
* functionality.
*
* Checks for the existence of an extension module described by the
* result of {@link Auth_OpenID_math_extensions()} and returns an
* instance of a wrapper for that extension module. If no extension
* module is found, an instance of {@link Auth_OpenID_MathWrapper} is
* returned, which wraps the native PHP integer implementation. The
* proper calling convention for this method is $lib =
* Auth_OpenID_getMathLib().
*
* This function checks for the existence of specific long number
* implementations in the following order: GMP followed by BCmath.
*
* @return Auth_OpenID_MathWrapper $instance An instance of
* {@link Auth_OpenID_MathWrapper} or one of its subclasses
*
* @package OpenID
*/
function Auth_OpenID_getMathLib()
{
// The instance of Auth_OpenID_MathWrapper that we choose to
// supply will be stored here, so that subseqent calls to this
// method will return a reference to the same object.
static $lib = null;
if (isset($lib)) {
return $lib;
}
if (Auth_OpenID_noMathSupport()) {
$null = null;
return $null;
}
// If this method has not been called before, look at
// Auth_OpenID_math_extensions and try to find an extension that
// works.
$ext = Auth_OpenID_detectMathLibrary(Auth_OpenID_math_extensions());
if ($ext === false) {
$tried = array();
foreach (Auth_OpenID_math_extensions() as $extinfo) {
$tried[] = $extinfo['extension'];
}
$triedstr = implode(", ", $tried);
Auth_OpenID_setNoMathSupport();
$result = null;
return $result;
}
// Instantiate a new wrapper
$class = $ext['class'];
$lib = new $class();
return $lib;
}
}
// ******** Math library selection ***********
// XXX FIXME
// case '--math-lib':
// $math_type[] = $value;
// break;
if ($math_type && false) {
if (defined('Auth_OpenID_NO_MATH_SUPPORT')) {
print "--no-math and --math-lib are mutually exclusive\n";
exit(1);
}
require_once 'Auth/OpenID/BigMath.php';
$new_extensions = array();
foreach ($math_type as $lib) {
$found = false;
foreach (Auth_OpenID_math_extensions() as $ext) {
if ($ext['extension'] == $lib) {
$new_extensions[] = $ext;
$found = true;
break;
}
}
if (!$found) {
print "Unknown math library specified: {$lib}\n";
exit(1);
}
}
$_Auth_OpenID_math_extensions = $new_extensions;
}
// ******** End math library selection **********
$suites = loadSuite($tests_to_run);
