Implement ConfirmationTokenChain to handle multiple tokens at once

src/Core/Startup/AbstractConfirmationToken.php

@@ -15,7 +15,7 @@ use SilverStripe\Security\RandomGenerator;
  *
  * @internal This class is designed specifically for use pre-startup and may change without warning
  */
-abstract class ConfirmationToken
+abstract class AbstractConfirmationToken
 {
     /**
      * @var HTTPRequest
@@ -173,6 +173,16 @@ HTML;
      */
     abstract public function params($includeToken = true);
 
+    /**
+     * @return string
+     */
+    abstract public function getRedirectUrlBase();
+
+    /**
+     * @return array
+     */
+    abstract public function getRedirectUrlParams();
+
     /**
      * Get redirection URL
      *

src/Core/Startup/ConfirmationTokenChain.php

@@ -0,0 +1,178 @@
+<?php
+
+namespace SilverStripe\Core\Startup;
+
+use SilverStripe\Control\Controller;
+use SilverStripe\Control\Director;
+use SilverStripe\Control\HTTPResponse;
+use SilverStripe\Core\Convert;
+
+/**
+ * A chain of confirmation tokens to be validated on each request. This allows the application to
+ * check multiple tokens at once without having to potentially redirect the user for each of them
+ *
+ * @internal This class is designed specifically for use pre-startup and may change without warning
+ */
+class ConfirmationTokenChain
+{
+    /**
+     * @var array
+     */
+    protected $tokens = [];
+
+    /**
+     * @param AbstractConfirmationToken $token
+     */
+    public function pushToken(AbstractConfirmationToken $token)
+    {
+        $this->tokens[] = $token;
+    }
+
+    /**
+     * Collect all tokens that require a redirect
+     *
+     * @return \Generator
+     */
+    protected function filteredTokens()
+    {
+        foreach ($this->tokens as $token) {
+            if ($token->reloadRequired() || $token->reloadRequiredIfError()) {
+                yield $token;
+            }
+        }
+    }
+
+    /**
+     * @return bool
+     */
+    public function suppressionRequired()
+    {
+        foreach ($this->tokens as $token) {
+            if ($token->reloadRequired()) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Suppress URLs & GET vars from tokens that require a redirect
+     */
+    public function suppressTokens()
+    {
+        foreach ($this->filteredTokens() as $token) {
+            $token->suppress();
+        }
+    }
+
+    /**
+     * @return bool
+     */
+    public function reloadRequired()
+    {
+        foreach ($this->tokens as $token) {
+            if ($token->reloadRequired()) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * @return bool
+     */
+    public function reloadRequiredIfError()
+    {
+        foreach ($this->tokens as $token) {
+            if ($token->reloadRequiredIfError()) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * @param bool $includeToken
+     * @return array
+     */
+    public function params($includeToken = true)
+    {
+        $params = [];
+        foreach ($this->tokens as $token) {
+            $params = array_merge($params, $token->params($includeToken));
+        }
+
+        return $params;
+    }
+
+    /**
+     * Fetch the URL we want to redirect to, excluding query string parameters. This may
+     * be the same URL (with a token to be added outside this method), or to a different
+     * URL if the current one has been suppressed
+     *
+     * @return string
+     */
+    public function getRedirectUrlBase()
+    {
+        // URLConfirmationTokens may alter the URL to suppress the URL they're protecting,
+        // so we need to ensure they're inspected last and therefore take priority
+        $tokens = iterator_to_array($this->filteredTokens(), false);
+        usort($tokens, function ($a, $b) {
+            return ($a instanceof URLConfirmationToken) ? 1 : 0;
+        });
+
+        $urlBase = Director::baseURL();
+        foreach ($tokens as $token) {
+            $urlBase = $token->getRedirectUrlBase();
+        }
+
+        return $urlBase;
+    }
+
+    /**
+     * Collate GET vars from all token providers that need to apply a token
+     *
+     * @return array
+     */
+    public function getRedirectUrlParams()
+    {
+        $params = [];
+        foreach ($this->filteredTokens() as $token) {
+            $params = array_merge($params, $token->getRedirectUrlParams());
+        }
+
+        return $params;
+    }
+
+    /**
+     * @return string
+     */
+    protected function redirectURL()
+    {
+        $params = http_build_query($this->getRedirectUrlParams());
+        return Controller::join_links($this->getRedirectUrlBase(), '?' . $params);
+    }
+
+    /**
+     * @return HTTPResponse
+     */
+    public function reloadWithTokens()
+    {
+        $location = $this->redirectURL();
+        $locationJS = Convert::raw2js($location);
+        $locationATT = Convert::raw2att($location);
+        $body = <<<HTML
+<script>location.href='$locationJS';</script>
+<noscript><meta http-equiv="refresh" content="0; url=$locationATT"></noscript>
+You are being redirected. If you are not redirected soon, <a href="$locationATT">click here to continue</a>
+HTML;
+
+        // Build response
+        $result = new HTTPResponse($body);
+        $result->redirect($location);
+        return $result;
+    }
+}

src/Core/Startup/ErrorControlChainMiddleware.php

@@ -34,20 +34,18 @@ class ErrorControlChainMiddleware implements HTTPMiddleware
 
     /**
      * @param HTTPRequest $request
-     * @return ConfirmationToken|null
+     * @return ConfirmationTokenChain
      */
-    protected function prepareConfirmationTokenIfRequired(HTTPRequest $request)
+    protected function prepareConfirmationTokenChain(HTTPRequest $request)
     {
-        $token = URLConfirmationToken::prepare_tokens(['dev/build'], $request);
+        $chain = new ConfirmationTokenChain();
+        $chain->pushToken(new URLConfirmationToken('dev/build', $request));
 
-        if (!$token) {
-            $token = ParameterConfirmationToken::prepare_tokens(
-                ['isTest', 'isDev', 'flush'],
-                $request
-            );
+        foreach (['isTest', 'isDev', 'flush'] as $parameter) {
+            $chain->pushToken(new ParameterConfirmationToken($parameter, $request));
         }
 
-        return $token;
+        return $chain;
     }
 
     public function process(HTTPRequest $request, callable $next)
@@ -55,19 +53,21 @@ class ErrorControlChainMiddleware implements HTTPMiddleware
         $result = null;
 
         // Prepare tokens and execute chain
-        $confirmationToken = $this->prepareConfirmationTokenIfRequired($request);
-        $chain = new ErrorControlChain();
-        $chain
-            ->then(function () use ($request, $chain, $confirmationToken, $next, &$result) {
-                // If no redirection is necessary then we can disable error supression
-                if (!$confirmationToken) {
-                    $chain->setSuppression(false);
+        $confirmationTokenChain = $this->prepareConfirmationTokenChain($request);
+        $errorControlChain = new ErrorControlChain();
+        $errorControlChain
+            ->then(function () use ($request, $errorControlChain, $confirmationTokenChain, $next, &$result) {
+                if ($confirmationTokenChain->suppressionRequired()) {
+                    $confirmationTokenChain->suppressTokens();
+                } else {
+                    // If no redirection is necessary then we can disable error supression
+                    $errorControlChain->setSuppression(false);
                 }
 
                 try {
                     // Check if a token is requesting a redirect
-                    if ($confirmationToken && $confirmationToken->reloadRequired()) {
-                        $result = $this->safeReloadWithToken($request, $confirmationToken);
+                    if ($confirmationTokenChain && $confirmationTokenChain->reloadRequired()) {
+                        $result = $this->safeReloadWithTokens($request, $confirmationTokenChain);
                     } else {
                         // If no reload necessary, process application
                         $result = call_user_func($next, $request);
@@ -77,10 +77,16 @@ class ErrorControlChainMiddleware implements HTTPMiddleware
                 }
             })
             // Finally if a token was requested but there was an error while figuring out if it's allowed, do it anyway
-            ->thenIfErrored(function () use ($confirmationToken) {
-                if ($confirmationToken && $confirmationToken->reloadRequiredIfError()) {
-                    $result = $confirmationToken->reloadWithToken();
-                    $result->output();
+            ->thenIfErrored(function () use ($confirmationTokenChain) {
+                if ($confirmationTokenChain && $confirmationTokenChain->reloadRequiredIfError()) {
+                    try {
+                        // Reload requires manual boot
+                        $this->getApplication()->getKernel()->boot(false);
+                    } finally {
+                        // Given we're in an error state here, try to continue even if the kernel boot fails
+                        $result = $confirmationTokenChain->reloadWithTokens();
+                        $result->output();
+                    }
                 }
             })
             ->execute();
@@ -92,10 +98,10 @@ class ErrorControlChainMiddleware implements HTTPMiddleware
      * or authentication is impossible.
      *
      * @param HTTPRequest $request
-     * @param ParameterConfirmationToken $reloadToken
+     * @param ConfirmationTokenChain $confirmationTokenChain
      * @return HTTPResponse
      */
-    protected function safeReloadWithToken(HTTPRequest $request, $reloadToken)
+    protected function safeReloadWithTokens(HTTPRequest $request, ConfirmationTokenChain $confirmationTokenChain)
     {
         // Safe reload requires manual boot
         $this->getApplication()->getKernel()->boot(false);
@@ -104,9 +110,9 @@ class ErrorControlChainMiddleware implements HTTPMiddleware
         $request->getSession()->init($request);
         
         // Request with ErrorDirector
-        $result = ErrorDirector::singleton()->handleRequestWithToken(
+        $result = ErrorDirector::singleton()->handleRequestWithTokenChain(
             $request,
-            $reloadToken,
+            $confirmationTokenChain,
             $this->getApplication()->getKernel()
         );
         if ($result) {
@@ -114,8 +120,8 @@ class ErrorControlChainMiddleware implements HTTPMiddleware
         }
 
         // Fail and redirect the user to the login page
-        $params = array_merge($request->getVars(), $reloadToken->params(false));
-        $backURL = $reloadToken->currentURL() . '?' . http_build_query($params);
+        $params = array_merge($request->getVars(), $confirmationTokenChain->params(false));
+        $backURL = $confirmationTokenChain->getRedirectUrlBase() . '?' . http_build_query($params);
         $loginPage = Director::absoluteURL(Security::config()->get('login_url'));
         $loginPage .= "?BackURL=" . urlencode($backURL);
         $result = new HTTPResponse();

src/Core/Startup/ErrorDirector.php

@@ -21,18 +21,21 @@ class ErrorDirector extends Director
      * Redirect with token if allowed, or null if not allowed
      *
      * @param HTTPRequest $request
-     * @param ConfirmationToken $token
+     * @param ConfirmationTokenChain $confirmationTokenChain
      * @param Kernel $kernel
      * @return null|HTTPResponse Redirection response, or null if not able to redirect
      */
-    public function handleRequestWithToken(HTTPRequest $request, ConfirmationToken $token, Kernel $kernel)
-    {
+    public function handleRequestWithTokenChain(
+        HTTPRequest $request,
+        ConfirmationTokenChain $confirmationTokenChain,
+        Kernel $kernel
+    ) {
         Injector::inst()->registerService($request, HTTPRequest::class);
 
         // Next, check if we're in dev mode, or the database doesn't have any security data, or we are admin
-        $reload = function (HTTPRequest $request) use ($token, $kernel) {
+        $reload = function (HTTPRequest $request) use ($confirmationTokenChain, $kernel) {
             if ($kernel->getEnvironment() === Kernel::DEV || !Security::database_is_ready() || Permission::check('ADMIN')) {
-                return $token->reloadWithToken();
+                return $confirmationTokenChain->reloadWithTokens();
             }
             return null;
         };

src/Core/Startup/ParameterConfirmationToken.php

@@ -3,6 +3,7 @@
 namespace SilverStripe\Core\Startup;
 
 use SilverStripe\Control\Controller;
+use SilverStripe\Control\Director;
 use SilverStripe\Control\HTTPRequest;
 use SilverStripe\Control\HTTPResponse;
 use SilverStripe\Core\Convert;
@@ -15,7 +16,7 @@ use SilverStripe\Security\RandomGenerator;
  *
  * @internal This class is designed specifically for use pre-startup and may change without warning
  */
-class ParameterConfirmationToken extends ConfirmationToken
+class ParameterConfirmationToken extends AbstractConfirmationToken
 {
     /**
      * The name of the parameter
@@ -140,19 +141,22 @@ class ParameterConfirmationToken extends ConfirmationToken
         }
         return $params;
     }
+
+    public function getRedirectUrlBase()
+    {
+        return ($this->existsInReferer() && !$this->parameterProvided()) ? Director::baseURL() : $this->currentURL();
+    }
+
+    public function getRedirectUrlParams()
+    {
+        return ($this->existsInReferer() && !$this->parameterProvided())
+            ? $this->params()
+            : array_merge($this->request->getVars(), $this->params());
+    }
     
     protected function redirectURL()
     {
-        // If url is encoded via BackURL, defer to home page (prevent redirect to form action)
-        if ($this->existsInReferer() && !$this->parameterProvided()) {
-            $url = BASE_URL ?: '/';
-            $params = $this->params();
-        } else {
-            $url = $this->currentURL();
-            $params = array_merge($this->request->getVars(), $this->params());
-        }
-
-        // Merge get params with current url
-        return Controller::join_links($url, '?' . http_build_query($params));
+        $query = http_build_query($this->getRedirectUrlParams());
+        return Controller::join_links($this->getRedirectUrlBase(), '?' . $query);
     }
 }

src/Core/Startup/URLConfirmationToken.php

@@ -12,7 +12,7 @@ use SilverStripe\Control\HTTPRequest;
  *
  * @internal This class is designed specifically for use pre-startup and may change without warning
  */
-class URLConfirmationToken extends ConfirmationToken
+class URLConfirmationToken extends AbstractConfirmationToken
 {
     /**
      * @var string
@@ -60,7 +60,7 @@ class URLConfirmationToken extends ConfirmationToken
      */
     protected function getURLExistsInBackURL(HTTPRequest $request)
     {
-        $backURL = $request->getVar('BackURL');
+        $backURL = ltrim($request->getVar('BackURL'), '/');
         return (strpos($backURL, $this->urlToCheck) === 0);
     }
 
@@ -119,18 +119,21 @@ class URLConfirmationToken extends ConfirmationToken
         return Controller::join_links(Director::baseURL(), $this->currentURL);
     }
 
+    public function getRedirectUrlBase()
+    {
+        return ($this->urlExistsInBackURL && !$this->urlMatches()) ? Director::baseURL() : $this->currentURL();
+    }
+
+    public function getRedirectUrlParams()
+    {
+        return ($this->urlExistsInBackURL && !$this->urlMatches())
+            ? $this->params()
+            : array_merge($this->request->getVars(), $this->params());
+    }
+
     protected function redirectURL()
     {
-        // If url is encoded via BackURL, defer to home page (prevent redirect to form action)
-        if ($this->urlExistsInBackURL && !$this->urlMatches()) {
-            $url = BASE_URL ?: '/';
-            $params = $this->params();
-        } else {
-            $url = $this->currentURL();
-            $params = array_merge($this->request->getVars(), $this->params());
-        }
-
-        // Merge get params with current url
-        return Controller::join_links($url, '?' . http_build_query($params));
+        $query = http_build_query($this->getRedirectUrlParams());
+        return Controller::join_links($this->getRedirectUrlBase(), '?' . $query);
     }
 }

tests/php/Core/Startup/ConfirmationTokenChainTest.php

@@ -0,0 +1,185 @@
+<?php
+
+namespace SilverStripe\Core\Tests\Startup;
+
+use SilverStripe\Core\Startup\ConfirmationTokenChain;
+use SilverStripe\Core\Startup\ParameterConfirmationToken;
+use SilverStripe\Core\Startup\URLConfirmationToken;
+use SilverStripe\Dev\SapphireTest;
+
+class ConfirmationTokenChainTest extends SapphireTest
+{
+    protected function getTokenRequiringReload($requiresReload = true, $extraMethods = [])
+    {
+        $methods = array_merge(['reloadRequired'], $extraMethods);
+        $mock = $this->createPartialMock(ParameterConfirmationToken::class, $methods);
+        $mock->expects($this->any())
+            ->method('reloadRequired')
+            ->will($this->returnValue($requiresReload));
+        return $mock;
+    }
+
+    protected function getTokenRequiringReloadIfError($requiresReload = true, $extraMethods = [])
+    {
+        $methods = array_merge(['reloadRequired', 'reloadRequiredIfError'], $extraMethods);
+        $mock = $this->createPartialMock(ParameterConfirmationToken::class, $methods);
+        $mock->expects($this->any())
+            ->method('reloadRequired')
+            ->will($this->returnValue(false));
+        $mock->expects($this->any())
+            ->method('reloadRequiredIfError')
+            ->will($this->returnValue($requiresReload));
+        return $mock;
+    }
+
+    public function testFilteredTokens()
+    {
+        $chain = new ConfirmationTokenChain();
+        $chain->pushToken($tokenRequiringReload = $this->getTokenRequiringReload());
+        $chain->pushToken($tokenNotRequiringReload = $this->getTokenRequiringReload(false));
+        $chain->pushToken($tokenRequiringReloadIfError = $this->getTokenRequiringReloadIfError());
+        $chain->pushToken($tokenNotRequiringReloadIfError = $this->getTokenRequiringReloadIfError(false));
+
+        $reflectionMethod = new \ReflectionMethod(ConfirmationTokenChain::class, 'filteredTokens');
+        $reflectionMethod->setAccessible(true);
+        $tokens = iterator_to_array($reflectionMethod->invoke($chain));
+
+        $this->assertContains($tokenRequiringReload, $tokens, 'Token requiring a reload was not returned');
+        $this->assertNotContains($tokenNotRequiringReload, $tokens, 'Token not requiring a reload was returned');
+        $this->assertContains($tokenRequiringReloadIfError, $tokens, 'Token requiring a reload on error was not returned');
+        $this->assertNotContains($tokenNotRequiringReloadIfError, $tokens, 'Token not requiring a reload on error was returned');
+    }
+
+    public function testSuppressionRequired()
+    {
+        $chain = new ConfirmationTokenChain();
+        $chain->pushToken($this->getTokenRequiringReload(false));
+        $this->assertFalse($chain->suppressionRequired(), 'Suppression incorrectly marked as required');
+
+        $chain = new ConfirmationTokenChain();
+        $chain->pushToken($this->getTokenRequiringReloadIfError(false));
+        $this->assertFalse($chain->suppressionRequired(), 'Suppression incorrectly marked as required');
+
+        $chain = new ConfirmationTokenChain();
+        $chain->pushToken($this->getTokenRequiringReload());
+        $this->assertTrue($chain->suppressionRequired(), 'Suppression not marked as required');
+
+        $chain = new ConfirmationTokenChain();
+        $chain->pushToken($this->getTokenRequiringReloadIfError());
+        $this->assertFalse($chain->suppressionRequired(), 'Suppression incorrectly marked as required');
+    }
+
+    public function testSuppressTokens()
+    {
+        $mockToken = $this->getTokenRequiringReload(true, ['suppress']);
+        $mockToken->expects($this->once())
+            ->method('suppress');
+        $secondMockToken = $this->getTokenRequiringReloadIfError(true, ['suppress']);
+        $secondMockToken->expects($this->once())
+            ->method('suppress');
+
+        $chain = new ConfirmationTokenChain();
+        $chain->pushToken($mockToken);
+        $chain->pushToken($secondMockToken);
+        $chain->suppressTokens();
+    }
+
+    public function testReloadRequired()
+    {
+        $mockToken = $this->getTokenRequiringReload(true);
+        $secondMockToken = $this->getTokenRequiringReload(false);
+
+        $chain = new ConfirmationTokenChain();
+        $chain->pushToken($mockToken);
+        $chain->pushToken($secondMockToken);
+        $this->assertTrue($chain->reloadRequired());
+    }
+
+    public function testReloadRequiredIfError()
+    {
+        $mockToken = $this->getTokenRequiringReloadIfError(true);
+        $secondMockToken = $this->getTokenRequiringReloadIfError(false);
+
+        $chain = new ConfirmationTokenChain();
+        $chain->pushToken($mockToken);
+        $chain->pushToken($secondMockToken);
+        $this->assertTrue($chain->reloadRequiredIfError());
+    }
+
+    public function testParams()
+    {
+        $mockToken = $this->getTokenRequiringReload(true, ['params']);
+        $mockToken->expects($this->once())
+            ->method('params')
+            ->with($this->isTrue())
+            ->will($this->returnValue(['mockTokenParam' => '1']));
+        $secondMockToken = $this->getTokenRequiringReload(true, ['params']);
+        $secondMockToken->expects($this->once())
+            ->method('params')
+            ->with($this->isTrue())
+            ->will($this->returnValue(['secondMockTokenParam' => '2']));
+
+        $chain = new ConfirmationTokenChain();
+        $chain->pushToken($mockToken);
+        $chain->pushToken($secondMockToken);
+        $this->assertEquals(['mockTokenParam' => '1', 'secondMockTokenParam' => '2'], $chain->params(true));
+
+        $mockToken = $this->getTokenRequiringReload(true, ['params']);
+        $mockToken->expects($this->once())
+            ->method('params')
+            ->with($this->isFalse())
+            ->will($this->returnValue(['mockTokenParam' => '1']));
+
+        $chain = new ConfirmationTokenChain();
+        $chain->pushToken($mockToken);
+        $this->assertEquals(['mockTokenParam' => '1'], $chain->params(false));
+    }
+
+    public function testGetRedirectUrlBase()
+    {
+        $mockUrlToken = $this->createPartialMock(URLConfirmationToken::class, ['reloadRequired', 'getRedirectUrlBase']);
+        $mockUrlToken->expects($this->any())
+            ->method('reloadRequired')
+            ->will($this->returnValue(true));
+        $mockUrlToken->expects($this->any())
+            ->method('getRedirectUrlBase')
+            ->will($this->returnValue('url-base'));
+
+        $mockParameterToken = $this->createPartialMock(ParameterConfirmationToken::class, ['reloadRequired', 'getRedirectUrlBase']);
+        $mockParameterToken->expects($this->any())
+            ->method('reloadRequired')
+            ->will($this->returnValue(true));
+        $mockParameterToken->expects($this->any())
+            ->method('getRedirectUrlBase')
+            ->will($this->returnValue('parameter-base'));
+
+        $chain = new ConfirmationTokenChain();
+        $chain->pushToken($mockParameterToken);
+        $chain->pushToken($mockUrlToken);
+        $this->assertEquals('url-base', $chain->getRedirectUrlBase(), 'URLConfirmationToken url base should take priority');
+
+        // Push them in reverse order to check priority still correct
+        $chain = new ConfirmationTokenChain();
+        $chain->pushToken($mockUrlToken);
+        $chain->pushToken($mockParameterToken);
+        $this->assertEquals('url-base', $chain->getRedirectUrlBase(), 'URLConfirmationToken url base should take priority');
+    }
+
+    public function testGetRedirectUrlParams()
+    {
+        $mockToken = $this->getTokenRequiringReload(true, ['getRedirectUrlParams']);
+        $mockToken->expects($this->once())
+            ->method('getRedirectUrlParams')
+            ->will($this->returnValue(['mockTokenParam' => '1']));
+
+        $secondMockToken = $this->getTokenRequiringReload(true, ['getRedirectUrlParams']);
+        $secondMockToken->expects($this->once())
+            ->method('getRedirectUrlParams')
+            ->will($this->returnValue(['secondMockTokenParam' => '2']));
+
+        $chain = new ConfirmationTokenChain();
+        $chain->pushToken($mockToken);
+        $chain->pushToken($secondMockToken);
+        $this->assertEquals(['mockTokenParam' => '1', 'secondMockTokenParam' => '2'], $chain->getRedirectUrlParams());
+    }
+}

tests/php/Core/Startup/ErrorControlChainMiddlewareTest.php

@@ -121,4 +121,56 @@ class ErrorControlChainMiddlewareTest extends SapphireTest
         $this->assertNotContains('?devbuildtoken=', $location);
         $this->assertContains('Security/login', $location);
     }
+
+    public function testLiveBuildAndFlushAdmin()
+    {
+        // Mock admin
+        $adminID = $this->logInWithPermission('ADMIN');
+        $this->logOut();
+
+        // Mock app
+        $app = new HTTPApplication(new BlankKernel(BASE_PATH));
+        $app->getKernel()->setEnvironment(Kernel::LIVE);
+
+        // Test being logged in as admin
+        $chain = new ErrorControlChainMiddleware($app);
+        $request = new HTTPRequest('GET', '/dev/build/', ['flush' => '1']);
+        $request->setSession(new Session(['loggedInAs' => $adminID]));
+        $result = $chain->process($request, function () {
+            return null;
+        });
+
+        $this->assertInstanceOf(HTTPResponse::class, $result);
+        $location = $result->getHeader('Location');
+        $this->assertContains('/dev/build', $location);
+        $this->assertContains('flush=1', $location);
+        $this->assertContains('devbuildtoken=', $location);
+        $this->assertContains('flushtoken=', $location);
+        $this->assertNotContains('Security/login', $location);
+    }
+
+    public function testLiveBuildAndFlushUnauthenticated()
+    {
+        // Mock app
+        $app = new HTTPApplication(new BlankKernel(BASE_PATH));
+        $app->getKernel()->setEnvironment(Kernel::LIVE);
+
+        // Test being logged in as no one
+        Security::setCurrentUser(null);
+        $chain = new ErrorControlChainMiddleware($app);
+        $request = new HTTPRequest('GET', '/dev/build', ['flush' => '1']);
+        $request->setSession(new Session(['loggedInAs' => 0]));
+        $result = $chain->process($request, function () {
+            return null;
+        });
+
+        // Should be directed to login, not to flush
+        $this->assertInstanceOf(HTTPResponse::class, $result);
+        $location = $result->getHeader('Location');
+        $this->assertNotContains('/dev/build', $location);
+        $this->assertNotContains('flush=1', $location);
+        $this->assertNotContains('devbuildtoken=', $location);
+        $this->assertNotContains('flushtoken=', $location);
+        $this->assertContains('Security/login', $location);
+    }
 }