Move SessionTrait from atk4/core and separate handler

demos/_includes/Session.php

@@ -4,11 +4,19 @@
 
 namespace Atk4\Ui\Demos;
 
+use Atk4\Core\AppScopeTrait;
 use Atk4\Core\NameTrait;
-use Atk4\Core\SessionTrait;
+use Atk4\Ui\App;
+use Atk4\Ui\SessionTrait;
 
 class Session
 {
+    use AppScopeTrait;
     use NameTrait;
     use SessionTrait;
+
+    public function __construct(App $app)
+    {
+        $this->setApp($app);
+    }
 }

demos/interactive/modal.php

@@ -11,7 +11,7 @@
 
 \Atk4\Ui\Header::addTo($app, ['Modal View']);
 
-$session = new Session();
+$session = new Session($app);
 // Re-usable component implementing counter
 
 \Atk4\Ui\Header::addTo($app, ['Static Modal Dialog']);

demos/interactive/popup.php

@@ -20,7 +20,8 @@
 
 /** @var \Atk4\Ui\Lister $cartClass */
 $cartClass = AnonymousClassNameCache::get_class(fn () => new class() extends \Atk4\Ui\Lister {
-    use \Atk4\Core\SessionTrait;
+    use \Atk4\Ui\SessionTrait;
+
     public $items = [];
 
     public $defaultTemplate = 'lister.html';

docs/session.rst

@@ -0,0 +1,62 @@
+=============
+Session Trait
+=============
+
+.. php:trait:: SessionTrait
+
+
+Introduction
+============
+
+SessionTrait is a simple way to let object store relevant data in the session. Specifically used in ATK UI
+some objects want to memorize data.  (see https://github.com/atk4/ui/blob/develop/src/Wizard.php#L12)
+
+You would need 3 things. First make use of session trait::
+
+    use \Atk4\Ui\SessionTrait;
+
+next you may memorize any value, which will be stored independently from any other object (even of a same class)::
+
+    $this->memorize('dsn', $dsn);
+
+Later when you need the value, you can simply recall it::
+
+    $dsn = $this->recall('dsn');
+
+
+Properties
+==========
+
+.. php:attr:: session_key
+
+    Internal property to make sure that all session data will be stored in one
+    "container" (array key).
+
+Methods
+=======
+
+.. php:method:: startSession($options = [])
+
+    Create new session.
+
+.. php:method:: destroySession()
+
+    Destroy existing session.
+
+.. php:method:: memorize($key, $value)
+
+    Remember data in object-relevant session data.
+
+.. php:method:: learn($key, $default = null)
+
+    Similar to memorize, but if value for key exist, will return it.
+
+.. php:method:: recall($key, $default = null)
+
+    Returns session data for this object. If not previously set, then $default
+    is returned.
+
+.. php:method:: forget($key = null)
+
+    Forget session data for arg $key. If $key is omitted will forget all
+    associated session data.

phpstan.neon.dist

@@ -211,6 +211,10 @@ parameters:
         -
             path: 'src/Panel/Right.php'
             message: '~^Call to an undefined method Atk4\\Ui\\JsExpression::addPanel\(\)\.$~'
+        -
+            path: 'src/SessionTrait.php'
+            count: 4
+            message: '~^Access to an undefined property Atk4\\Ui\\Tests\\SessionAbstractMock::\$name\.$~'
         -
             path: 'src/Table/Column.php'
             message: '~^Call to an undefined method Atk4\\Ui\\AbstractView::setHoverable\(\)\.$~'

phpunit.xml.dist

@@ -13,6 +13,7 @@
     <groups>
         <exclude>
             <group>demos_http</group>
+            <group>require_session</group>
         </exclude>
     </groups>
     <listeners>

src/App.php

@@ -105,6 +105,9 @@ class App
     /** @var Persistence|Persistence\Sql */
     public $db;
 
+    /** @var App\Session */
+    public $session;
+
     /** @var string[] Extra HTTP headers to send on exit. */
     protected $response_headers = [
         self::HEADER_STATUS_CODE => '200',
@@ -136,39 +139,11 @@ class App
 
     public $templateClass = HtmlTemplate::class;
 
-    /**
-     * @param array $defaults
-     */
-    public function __construct($defaults = [])
+    public function __construct(array $defaults = [])
     {
         $this->setApp($this);
 
-        // Process defaults
-        if (is_string($defaults)) {
-            $defaults = ['title' => $defaults];
-        }
-
-        if (isset($defaults[0])) {
-            $defaults['title'] = $defaults[0];
-            unset($defaults[0]);
-        }
-
-        /*
-        if (is_array($defaults)) {
-            throw (new Exception('Constructor requires array argument'))
-                ->addMoreInfo('arg', $defaults);
-        }*/
         $this->setDefaults($defaults);
-        /*
-
-        foreach ($defaults as $key => $val) {
-            if (is_array($val)) {
-                $this->{$key} = array_merge(is_array($this->{$key} ?? null) ? $this->{$key} : [], $val);
-            } elseif ($val !== null) {
-                $this->{$key} = $val;
-            }
-        }
-         */
 
         $this->setupTemplateDirs();
 
@@ -208,11 +183,14 @@ static function (int $severity, string $msg, string $file, int $line): bool {
             $this->setupAlwaysRun();
         }
 
-        // Set up UI persistence
         if ($this->ui_persistence === null) {
             $this->ui_persistence = new UiPersistence();
         }
 
+        if ($this->session === null) {
+            $this->session = new App\Session();
+        }
+
         // setting up default executor factory.
         $this->executorFactory = Factory::factory([ExecutorFactory::class]);
     }

src/App/Session.php

@@ -0,0 +1,121 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Atk4\Ui\App;
+
+use Atk4\Ui\Exception;
+
+class Session
+{
+    /** @var string Session container key. */
+    protected $session_key = '__atk_session';
+
+    /**
+     * Create new session.
+     *
+     * @param array $options Options for session_start()
+     */
+    public function startSession(array $options = []): void
+    {
+        switch (session_status()) {
+            case \PHP_SESSION_DISABLED:
+                // @codeCoverageIgnoreStart - impossible to test
+                throw new Exception('Sessions are disabled on server');
+                // @codeCoverageIgnoreEnd
+            case \PHP_SESSION_NONE:
+                session_start($options);
+
+                break;
+        }
+    }
+
+    /**
+     * Destroy existing session.
+     */
+    public function destroySession(): void
+    {
+        if (session_status() === \PHP_SESSION_ACTIVE) {
+            session_destroy();
+            unset($_SESSION);
+        }
+    }
+
+    /**
+     * Remember data in object-relevant session data.
+     *
+     * @param mixed $value
+     *
+     * @return mixed $value
+     */
+    public function memorize(string $namespace, string $key, $value)
+    {
+        $this->startSession();
+
+        $_SESSION[$this->session_key][$namespace][$key] = $value;
+
+        return $value;
+    }
+
+    /**
+     * Similar to memorize, but if value for key exist, will return it.
+     *
+     * @param mixed $default
+     *
+     * @return mixed Previously memorized data or $default
+     */
+    public function learn(string $namespace, string $key, $default = null)
+    {
+        $this->startSession();
+
+        if (!isset($_SESSION[$this->session_key][$namespace][$key])) {
+            if ($default instanceof \Closure) {
+                $default = $default($key);
+            }
+
+            return $this->memorize($namespace, $key, $default);
+        }
+
+        return $this->recall($namespace, $key);
+    }
+
+    /**
+     * Returns session data for this object. If not previously set, then
+     * $default is returned.
+     *
+     * @param mixed $default
+     *
+     * @return mixed Previously memorized data or $default
+     */
+    public function recall(string $namespace, string $key, $default = null)
+    {
+        $this->startSession();
+
+        if (!isset($_SESSION[$this->session_key][$namespace][$key])) {
+            if ($default instanceof \Closure) {
+                $default = $default($key);
+            }
+
+            return $default;
+        }
+
+        return $_SESSION[$this->session_key][$namespace][$key];
+    }
+
+    /**
+     * Forget session data for $key. If $key is omitted will forget all
+     * associated session data.
+     *
+     * @param string $key Optional key of data to forget
+     */
+    public function forget(string $namespace, string $key = null): void
+    {
+        $this->startSession();
+
+        if ($key === null) {
+            unset($_SESSION[$this->session_key][$namespace]);
+        } else {
+            unset($_SESSION[$this->session_key][$namespace][$key]);
+        }
+    }
+}

src/SessionTrait.php

@@ -0,0 +1,72 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Atk4\Ui;
+
+use Atk4\Core\TraitUtil;
+
+trait SessionTrait
+{
+    private function getSession(): App\Session
+    {
+        // all methods use this method, so we better check NameTrait existence here in one place
+        if (!TraitUtil::hasNameTrait($this)) {
+            throw new Exception('Object should have NameTrait applied to use session');
+        }
+
+        return $this->getApp()->session;
+    }
+
+    /**
+     * Remember data in object-relevant session data.
+     *
+     * @param mixed $value
+     *
+     * @return mixed $value
+     */
+    public function memorize(string $key, $value)
+    {
+        return $this->getSession()->memorize($this->name, $key, $value);
+    }
+
+    /**
+     * Similar to memorize, but if value for key exist, will return it.
+     *
+     * @param mixed $default
+     *
+     * @return mixed Previously memorized data or $default
+     */
+    public function learn(string $key, $default = null)
+    {
+        return $this->getSession()->learn($this->name, $key, $default);
+    }
+
+    /**
+     * Returns session data for this object. If not previously set, then
+     * $default is returned.
+     *
+     * @param mixed $default
+     *
+     * @return mixed Previously memorized data or $default
+     */
+    public function recall(string $key, $default = null)
+    {
+        return $this->getSession()->recall($this->name, $key, $default);
+    }
+
+    /**
+     * Forget session data for $key. If $key is omitted will forget all
+     * associated session data.
+     *
+     * @param string $key Optional key of data to forget
+     *
+     * @return $this
+     */
+    public function forget(string $key = null)
+    {
+        $this->getSession()->forget($this->name, $key);
+
+        return $this;
+    }
+}