PhabricatorAuthValidateController.php
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	<?php

	final class PhabricatorAuthValidateController
	extends PhabricatorAuthController {

	public function shouldRequireLogin() {
	return false;
	}

	public function shouldAllowPartialSessions() {
	return true;
	}

	public function processRequest() {
	$request = $this->getRequest();
	$viewer = $request->getUser();

	$failures = array();

	if (!strlen($request->getStr('expect'))) {
	return $this->renderErrors(
	array(
	pht(
	'Login validation is missing expected parameter ("%s").',
	'phusr'),
	));
	}

	$expect_phusr = $request->getStr('expect');
	$actual_phusr = $request->getCookie(PhabricatorCookies::COOKIE_USERNAME);
	if ($actual_phusr != $expect_phusr) {
	if ($actual_phusr) {
	$failures[] = pht(
	"Attempted to set '%s' cookie to '%s', but your browser sent back ".
	"a cookie with the value '%s'. Clear your browser's cookies and ".
	"try again.",
	'phusr',
	$expect_phusr,
	$actual_phusr);
	} else {
	$failures[] = pht(
	"Attempted to set '%s' cookie to '%s', but your browser did not ".
	"accept the cookie. Check that cookies are enabled, clear them, ".
	"and try again.",
	'phusr',
	$expect_phusr);
	}
	}

	if (!$failures) {
	if (!$viewer->getPHID()) {
	$failures[] = pht(
	'Login cookie was set correctly, but your login session is not '.
	'valid. Try clearing cookies and logging in again.');
	}
	}

	if ($failures) {
	return $this->renderErrors($failures);
	}

	$finish_uri = $this->getApplicationURI('finish/');
	return id(new AphrontRedirectResponse())->setURI($finish_uri);
	}

	private function renderErrors(array $messages) {
	return $this->renderErrorPage(
	pht('Login Failure'),
	$messages);
	}

	}