Added helper class for HTTP basic auth

lib/Sabre/HTTP/Auth/Basic.php

@@ -0,0 +1,81 @@
+<?php
+
+namespace Sabre\HTTP\Auth;
+
+use Sabre\HTTP\Request;
+use Sabre\HTTP\Response;
+
+/**
+ * HTTP Basic authentication utility.
+ *
+ * This class helps you setup basic auth. The process is fairly simple:
+ *
+ * 1. Instantiate the class.
+ * 2. Call getCredentials (this will return null or a user/pass pair)
+ * 3. If you didn't get valid credentials, call 'requireLogin'
+ *
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+class Basic {
+
+    /**
+     * Authentication realm
+     *
+     * @var string
+     */
+    protected $realm;
+
+    /**
+     * Creates the basic auth helper.
+     *
+     * @param string $realm
+     * @return void
+     */
+    public function __construct($realm = 'SabreTooth') {
+
+        $this->realm = $realm;
+
+    }
+
+    /**
+     * This method returns a numeric array with a username and password as the
+     * only elements.
+     *
+     * If no credentials were found, this method returns null.
+     *
+     * @param Sabre\HTTP\Request $request
+     * @return null|array
+     */
+    public function getCredentials(Request $request) {
+
+        $auth = $request->getHeader('Authorization');
+
+        if (!$auth) {
+            return null;
+        }
+
+        if (strtolower(substr($auth,0,6))!=='basic ') {
+            return null;
+        }
+
+        return explode(':',base64_decode(substr($auth, 6)), 2);
+
+    }
+
+    /**
+     * This method sends the needed HTTP header and statuscode (401) to force
+     * the user to login.
+     *
+     * @param Sabre\HTTP\Response
+     * @return void
+     */
+    public function requireLogin(Response $response) {
+
+        $response->setHeader('WWW-Authenticate','Basic realm="' . $this->realm . '"');
+        $response->setStatus(401);
+
+    }
+
+}

tests/Sabre/HTTP/Auth/BasicTest.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace Sabre\HTTP\Auth;
+
+use Sabre\HTTP\Request;
+use Sabre\HTTP\Response;
+
+class BasicTest extends \PHPUnit_Framework_TestCase {
+
+    function testGetCredentials() {
+
+        $request = new Request('GET','/',array(
+            'Authorization' => 'Basic ' . base64_encode('user:pass:bla')
+        ));
+
+        $basic = new Basic('Dagger');
+
+        $this->assertEquals(array(
+            'user',
+            'pass:bla',
+        ), $basic->getCredentials($request));
+
+    }
+
+    function testGetCredentialsNoheader() {
+
+        $request = new Request('GET','/',array());
+        $basic = new Basic('Dagger');
+
+        $this->assertNull($basic->getCredentials($request));
+
+    }
+
+    function testGetCredentialsNotBasic() {
+
+        $request = new Request('GET','/',array(
+            'Authorization' => 'QBasic ' . base64_encode('user:pass:bla')
+        ));
+        $basic = new Basic('Dagger');
+
+        $this->assertNull($basic->getCredentials($request));
+
+    }
+
+    function testRequireLogin() {
+
+        $response = new Response();
+        $basic = new Basic('Dagger');
+
+        $basic->requireLogin($response);
+
+        $this->assertEquals('Basic realm="Dagger"', $response->getHeader('WWW-Authenticate'));
+        $this->assertEquals('401 Unauthorized', $response->getStatus());
+
+    }
+
+}