add authentication services and do some unit testing

app/dependencies.php

 <?php
+/**
+ * gredu_labs
+ * 
+ * @link https://github.com/eellak/gredu_labs for the canonical source repository
+ * @copyright Copyright (c) 2008-2015 Greek Free/Open Source Software Society (https://gfoss.ellak.gr/)
+ * @license GNU GPLv3 http://www.gnu.org/licenses/gpl-3.0-standalone.html
+ */
+
 
 $container = $app->getContainer();
 
@@ -10,9 +18,10 @@ $container['view'] = function ($c) {
         $settings['view']['template_path'],
         $settings['view']['twig']
     );
-    $view->addExtension(
-        new Slim\Views\TwigExtension($c->get('router'), $c->get('request')->getUri())
-    );
+    $view->addExtension(new Slim\Views\TwigExtension(
+        $c->get('router'),
+        $c->get('request')->getUri()
+    ));
     $view->addExtension(new Twig_Extension_Debug());
 
     return $view;
@@ -21,7 +30,7 @@ $container['view'] = function ($c) {
 // Flash messages
 
 $container['flash'] = function ($c) {
-    return new \Slim\Flash\messages;
+    return new \Slim\Flash\Messages;
 };
 
 // Monolog
@@ -37,3 +46,30 @@ $container['logger'] = function ($c) {
 
     return $logger;
 };
+
+$container['events'] = function ($c) {
+    return new \Zend\EventManager\EventManager(
+        new \Zend\EventManager\SharedEventManager()
+    );
+};
+
+$container['Service\\Authentication\\Adapter'] = function ($c) use ($app) {
+    return new \Zend\Authentication\Adapter\Callback(function () use ($c) {
+        return $c->events->triggerUntil(
+            function (\Zend\Authentication\Result $result) {
+                return $result->isValid();
+            },
+            'authenticate', $app, func_get_args()
+        )->last();
+    });
+};
+
+$container['Service\\Authentication'] = function ($c) {
+
+    $service = new \Zend\Authentication\AuthenticationService(
+        new \GrEduLabs\Authentication\Storage\PhpSession($_SESSION),
+        $c->get('Service\\Authentication\\Adapter')
+    );
+
+    return $service;
+};

app/middleware.php

 <?php
+/**
+ * gredu_labs
+ * 
+ * @link https://github.com/eellak/gredu_labs for the canonical source repository
+ * @copyright Copyright (c) 2008-2015 Greek Free/Open Source Software Society (https://gfoss.ellak.gr/)
+ * @license GNU GPLv3 http://www.gnu.org/licenses/gpl-3.0-standalone.html
+ */
+
 // Application middleware
 // e.g: $app->add(new \Slim\Csrf\Guard);
+

app/routes.php

 <?php
+/**
+ * gredu_labs
+ * 
+ * @link https://github.com/eellak/gredu_labs for the canonical source repository
+ * @copyright Copyright (c) 2008-2015 Greek Free/Open Source Software Society (https://gfoss.ellak.gr/)
+ * @license GNU GPLv3 http://www.gnu.org/licenses/gpl-3.0-standalone.html
+ */
+
 
 $app->get('/', function ($request, $response, $args) use ($app) {
     $container = $app->getContainer();

app/src/Authentication/Storage/PhpSession.php

+<?php
+/**
+ * gredu_labs
+ * 
+ * @link https://github.com/eellak/gredu_labs for the canonical source repository
+ * @copyright Copyright (c) 2008-2015 Greek Free/Open Source Software Society (https://gfoss.ellak.gr/)
+ * @license GNU GPLv3 http://www.gnu.org/licenses/gpl-3.0-standalone.html
+ */
+
+namespace GrEduLabs\Authentication\Storage;
+
+use Zend\Authentication\Storage\StorageInterface;
+
+class PhpSession implements StorageInterface
+{
+    /**
+     * Default session namespace
+     */
+    const NAMESPAGE_DEFAULT = 'GrEduLabs_Auth';
+
+    /**
+     * Default session object member name
+     */
+    const MEMBER_DEFAULT = 'storage';
+
+    /**
+     * Session array
+     * 
+     * @var array
+     */
+    protected $session;
+
+    /**
+     * Session namespace
+     *
+     * @var mixed
+     */
+    protected $namespace = self::NAMESPAGE_DEFAULT;
+
+    /**
+     * Session object member
+     *
+     * @var mixed
+     */
+    protected $member = self::MEMBER_DEFAULT;
+
+    /**
+     * Sets session storage options and initializes session namespace
+     *
+     * @param  array $session
+     * @param  mixed $namespace
+     * @param  mixed $member
+     */
+    public function __construct(array &$session, $namespace = null, $member = null)
+    {
+        if ($namespace !== null) {
+            $this->namespace = $namespace;
+        }
+        if ($member !== null) {
+            $this->member = $member;
+        }
+        $this->session                   =& $session;
+        $this->session[$this->namespace] = [];
+    }
+
+    /**
+     * Returns the session namespace
+     *
+     * @return string
+     */
+    public function getNamespace()
+    {
+        return $this->namespace;
+    }
+
+    /**
+     * Returns the name of the session object member
+     *
+     * @return string
+     */
+    public function getMember()
+    {
+        return $this->member;
+    }
+
+    /**
+     * Returns true if and only if storage is empty
+     *
+     * @throws \Zend\Authentication\Exception\ExceptionInterface If it is impossible to determine whether storage is empty
+     * @return bool
+     */
+    public function isEmpty()
+    {
+        return !isset($this->session[$this->namespace][$this->member]);
+    }
+
+    /**
+     * Returns the contents of storage
+     *
+     * Behavior is undefined when storage is empty.
+     *
+     * @throws \Zend\Authentication\Exception\ExceptionInterface If reading contents from storage is impossible
+     * @return mixed
+     */
+    public function read()
+    {
+        return $this->session[$this->namespace][$this->member];
+    }
+
+    /**
+     * Writes $contents to storage
+     *
+     * @param  mixed $contents
+     * @throws \Zend\Authentication\Exception\ExceptionInterface If writing $contents to storage is impossible
+     * @return void
+     */
+    public function write($contents)
+    {
+        $this->session[$this->namespace][$this->member] = $contents;
+    }
+
+    /**
+     * Clears contents from storage
+     *
+     * @throws \Zend\Authentication\Exception\ExceptionInterface If clearing contents from storage is impossible
+     * @return void
+     */
+    public function clear()
+    {
+        unset($this->session[$this->namespace][$this->member]);
+    }
+}

composer.json

@@ -22,7 +22,9 @@
         "slim/twig-view": "^2.0",
         "slim/flash": "^0.1.0",
         "monolog/monolog": "^1.13",
-        "kanellov/config-merge": "dev-master"
+        "kanellov/config-merge": "dev-master",
+        "zendframework/zend-authentication": "^2.0",
+        "zendframework/zend-eventmanager": "^3.0"
     },
     "require-dev": {
         "fabpot/php-cs-fixer": "1.*",
@@ -32,11 +34,12 @@
     },
     "autoload": {
         "psr-4": {
-            "GrEdu\\": "app/src"
+            "GrEduLabs\\": "app/src"
         }
     },
     "autoload-dev": {
-        "psr-0": {
+        "psr-4": {
+            "GrEduLabsTest\\": "test/src"
         }
     }
 }

composer.lock

@@ -4,8 +4,8 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "hash": "9a345fe353c41b2f1fb399680d646fe0",
-    "content-hash": "ab7cd1b922f8f7454f39339a431343f4",
+    "hash": "8f23b8ce2b3934db70f529ce01ff5b1d",
+    "content-hash": "335c05fc635c7a452b9fa6e390019a37",
     "packages": [
         {
             "name": "container-interop/container-interop",
@@ -557,6 +557,236 @@
                 "templating"
             ],
             "time": "2016-01-11 14:02:19"
+        },
+        {
+            "name": "zendframework/zend-authentication",
+            "version": "2.5.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/zendframework/zend-authentication.git",
+                "reference": "1002b40baa9acb3f875cc77f4a2b4fc238b62170"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/zendframework/zend-authentication/zipball/1002b40baa9acb3f875cc77f4a2b4fc238b62170",
+                "reference": "1002b40baa9acb3f875cc77f4a2b4fc238b62170",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.5",
+                "zendframework/zend-stdlib": "~2.5"
+            },
+            "require-dev": {
+                "fabpot/php-cs-fixer": "1.7.*",
+                "phpunit/phpunit": "~4.0",
+                "zendframework/zend-crypt": "~2.5",
+                "zendframework/zend-db": "~2.5",
+                "zendframework/zend-http": "~2.5",
+                "zendframework/zend-ldap": "~2.5",
+                "zendframework/zend-session": "~2.5",
+                "zendframework/zend-uri": "~2.5",
+                "zendframework/zend-validator": "~2.5"
+            },
+            "suggest": {
+                "zendframework/zend-crypt": "Zend\\Crypt component",
+                "zendframework/zend-db": "Zend\\Db component",
+                "zendframework/zend-http": "Zend\\Http component",
+                "zendframework/zend-ldap": "Zend\\Ldap component",
+                "zendframework/zend-session": "Zend\\Session component",
+                "zendframework/zend-uri": "Zend\\Uri component",
+                "zendframework/zend-validator": "Zend\\Validator component"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.5-dev",
+                    "dev-develop": "2.6-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Zend\\Authentication\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "description": "provides an API for authentication and includes concrete authentication adapters for common use case scenarios",
+            "homepage": "https://github.com/zendframework/zend-authentication",
+            "keywords": [
+                "Authentication",
+                "zf2"
+            ],
+            "time": "2015-06-15 19:37:28"
+        },
+        {
+            "name": "zendframework/zend-eventmanager",
+            "version": "3.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/zendframework/zend-eventmanager.git",
+                "reference": "8c9917f1595ff260f289439bdeb1f46500c65d62"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/zendframework/zend-eventmanager/zipball/8c9917f1595ff260f289439bdeb1f46500c65d62",
+                "reference": "8c9917f1595ff260f289439bdeb1f46500c65d62",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.5 || ^7.0"
+            },
+            "require-dev": {
+                "athletic/athletic": "^0.1",
+                "container-interop/container-interop": "^1.1.0",
+                "phpunit/phpunit": "~4.0",
+                "squizlabs/php_codesniffer": "^2.0",
+                "zendframework/zend-stdlib": "^2.7.3"
+            },
+            "suggest": {
+                "container-interop/container-interop": "^1.1.0, to use the lazy listeners feature",
+                "zendframework/zend-stdlib": "^2.7.3, to use the FilterChain feature"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0-dev",
+                    "dev-develop": "3.1-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Zend\\EventManager\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "description": "Trigger and listen to events within a PHP application",
+            "homepage": "https://github.com/zendframework/zend-eventmanager",
+            "keywords": [
+                "event",
+                "eventmanager",
+                "events",
+                "zf2"
+            ],
+            "time": "2016-01-12 23:27:48"
+        },
+        {
+            "name": "zendframework/zend-hydrator",
+            "version": "1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/zendframework/zend-hydrator.git",
+                "reference": "f3ed8b833355140350bbed98d8a7b8b66875903f"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/zendframework/zend-hydrator/zipball/f3ed8b833355140350bbed98d8a7b8b66875903f",
+                "reference": "f3ed8b833355140350bbed98d8a7b8b66875903f",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.5",
+                "zendframework/zend-stdlib": "^2.5.1"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "~4.0",
+                "squizlabs/php_codesniffer": "^2.0@dev",
+                "zendframework/zend-eventmanager": "^2.5.1",
+                "zendframework/zend-filter": "^2.5.1",
+                "zendframework/zend-inputfilter": "^2.5.1",
+                "zendframework/zend-serializer": "^2.5.1",
+                "zendframework/zend-servicemanager": "^2.5.1"
+            },
+            "suggest": {
+                "zendframework/zend-eventmanager": "^2.5.1, to support aggregate hydrator usage",
+                "zendframework/zend-filter": "^2.5.1, to support naming strategy hydrator usage",
+                "zendframework/zend-serializer": "^2.5.1, to use the SerializableStrategy",
+                "zendframework/zend-servicemanager": "^2.5.1, to support hydrator plugin manager usage"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0-dev",
+                    "dev-develop": "1.1-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Zend\\Hydrator\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "homepage": "https://github.com/zendframework/zend-hydrator",
+            "keywords": [
+                "hydrator",
+                "zf2"
+            ],
+            "time": "2015-09-17 14:06:43"
+        },
+        {
+            "name": "zendframework/zend-stdlib",
+            "version": "2.7.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/zendframework/zend-stdlib.git",
+                "reference": "cae029346a33663b998507f94962eb27de060683"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/zendframework/zend-stdlib/zipball/cae029346a33663b998507f94962eb27de060683",
+                "reference": "cae029346a33663b998507f94962eb27de060683",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.5",
+                "zendframework/zend-hydrator": "~1.0"
+            },
+            "require-dev": {
+                "athletic/athletic": "~0.1",
+                "fabpot/php-cs-fixer": "1.7.*",
+                "phpunit/phpunit": "~4.0",
+                "zendframework/zend-config": "~2.5",
+                "zendframework/zend-eventmanager": "~2.5",
+                "zendframework/zend-filter": "~2.5",
+                "zendframework/zend-inputfilter": "~2.5",
+                "zendframework/zend-serializer": "~2.5",
+                "zendframework/zend-servicemanager": "~2.5"
+            },
+            "suggest": {
+                "zendframework/zend-eventmanager": "To support aggregate hydrator usage",
+                "zendframework/zend-filter": "To support naming strategy hydrator usage",
+                "zendframework/zend-serializer": "Zend\\Serializer component",
+                "zendframework/zend-servicemanager": "To support hydrator plugin manager usage"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.7-dev",
+                    "dev-develop": "2.8-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Zend\\Stdlib\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "homepage": "https://github.com/zendframework/zend-stdlib",
+            "keywords": [
+                "stdlib",
+                "zf2"
+            ],
+            "time": "2015-10-15 15:57:32"
         }
     ],
     "packages-dev": [

phpunit.xml.dist

+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="./vendor/phpunit/phpunit/phpunit.xsd"
+         bootstrap="./vendor/autoload.php"
+         colors="true"
+         verbose="true">
+    <testsuites>
+        <testsuite name="GrEduLabs Test Suite">
+            <directory suffix="Test.php">./test/</directory>
+        </testsuite>
+    </testsuites>
+
+    <groups>
+        <exclude>
+            <group>disable</group>
+        </exclude>
+    </groups>
+
+    <filter>
+        <whitelist addUncoveredFilesFromWhitelist="true">
+            <directory suffix=".php">./app/</directory>
+            <exclude>
+                <directory>./app/templates</directory>
+            </exclude>
+        </whitelist>
+    </filter>
+
+    <logging>
+        <log type="coverage-text" target="php://stdout" showUncoveredFiles="true"/>
+    </logging>
+
+    <php>
+        <ini name="date.timezone" value="UTC"/>
+    </php>
+</phpunit>
\ No newline at end of file

public/index.php

 <?php
+/**
+ * gredu_labs
+ * 
+ * @link https://github.com/eellak/gredu_labs for the canonical source repository
+ * @copyright Copyright (c) 2008-2015 Greek Free/Open Source Software Society (https://gfoss.ellak.gr/)
+ * @license GNU GPLv3 http://www.gnu.org/licenses/gpl-3.0-standalone.html
+ */
+
 chdir(dirname(__DIR__));
 
 if (PHP_SAPI === 'cli-server' && $_SERVER['SCRIPT_FILENAME'] !== __FILE__) {

test/DependenciesTest.php

+<?php
+/**
+ * gredu_labs
+ * 
+ * @link https://github.com/eellak/gredu_labs for the canonical source repository
+ * @copyright Copyright (c) 2008-2015 Greek Free/Open Source Software Society (https://gfoss.ellak.gr/)
+ * @license GNU GPLv3 http://www.gnu.org/licenses/gpl-3.0-standalone.html
+ */
+
+class DependenciesTest extends \PHPUnit_Framework_TestCase
+{
+    private static $container;
+    private static $settings = [
+        'settings' => [
+            'view' => [
+                'template_path' => __DIR__,
+                'twig'          => [
+                    'cache'       => __DIR__,
+                    'debug'       => true,
+                    'auto_reload' => true,
+                ],
+            ],
+            'logger' => [
+                'name' => 'app',
+                'path' => __DIR__,
+            ],
+        ],
+    ];
+
+    public static function setUpBeforeClass()
+    {
+        @session_start();
+        $app = new \Slim\App(self::$settings);
+        require __DIR__ . '/../app/dependencies.php';
+        self::$container = $container;
+        @session_destroy();
+    }
+
+    public function testViewInContainer()
+    {
+        $view = self::$container->get('view');
+        $this->assertInstanceOf('\Slim\Views\Twig', $view);
+    }
+
+    public function testFlashInContainer()
+    {
+        $flash = self::$container->get('flash');
+        $this->assertInstanceOf('\Slim\Flash\Messages', $flash);
+    }
+
+    public function testLoggerInContainer()
+    {
+        $logger = self::$container->get('logger');
+        $this->assertInstanceOf('\Monolog\Logger', $logger);
+    }
+
+    public function testEventsInContainer()
+    {
+        $events = self::$container->get('events');
+        $this->assertInstanceOf('\Zend\EventManager\EventManagerInterface', $events);
+    }
+}

test/src/Authentication/Storage/PhpSessionTest.php

+<?php
+/**
+ * gredu_labs
+ * 
+ * @link https://github.com/eellak/gredu_labs for the canonical source repository
+ * @copyright Copyright (c) 2008-2015 Greek Free/Open Source Software Society (https://gfoss.ellak.gr/)
+ * @license GNU GPLv3 http://www.gnu.org/licenses/gpl-3.0-standalone.html
+ */
+
+namespace GrEduLabstest\Authentication\Storage;
+
+use GrEduLabs\Authentication\Storage\PhpSession;
+
+class PhpSessionTest extends \PHPUnit_Framework_TestCase
+{
+    private $storage;
+
+    private $session;
+
+    protected function setUp()
+    {
+        $this->session = [];
+        $this->storage = new PhpSession($this->session);