Process session filters through Slim controllers

Including:
  - visibility
  - links per page
  - untagged only

application/front/controllers/SessionFilterController.php

@@ -0,0 +1,81 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller;
+
+use Shaarli\Bookmark\BookmarkFilter;
+use Shaarli\Security\SessionManager;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Class SessionFilterController
+ *
+ * Slim controller used to handle filters stored in the user session, such as visibility, links per page, etc.
+ *
+ * @package Shaarli\Front\Controller
+ */
+class SessionFilterController extends ShaarliController
+{
+    /**
+     * GET /links-per-page: set the number of bookmarks to display per page in homepage
+     */
+    public function linksPerPage(Request $request, Response $response): Response
+    {
+        $linksPerPage = $request->getParam('nb') ?? null;
+        if (null === $linksPerPage || false === is_numeric($linksPerPage)) {
+            $linksPerPage = $this->container->conf->get('general.links_per_page', 20);
+        }
+
+        $this->container->sessionManager->setSessionParameter(
+            SessionManager::KEY_LINKS_PER_PAGE,
+            abs(intval($linksPerPage))
+        );
+
+        return $this->redirectFromReferer($response, ['linksperpage'], ['nb']);
+    }
+
+    /**
+     * GET /visibility: allows to display only public or only private bookmarks in linklist
+     */
+    public function visibility(Request $request, Response $response, array $args): Response
+    {
+        if (false === $this->container->loginManager->isLoggedIn()) {
+            return $this->redirectFromReferer($response, ['visibility']);
+        }
+
+        $newVisibility = $args['visibility'] ?? null;
+        if (false === in_array($newVisibility, [BookmarkFilter::$PRIVATE, BookmarkFilter::$PUBLIC], true)) {
+            $newVisibility = null;
+        }
+
+        $currentVisibility = $this->container->sessionManager->getSessionParameter(SessionManager::KEY_VISIBILITY);
+
+        // Visibility not set or not already expected value, set expected value, otherwise reset it
+        if ($newVisibility !== null && (null === $currentVisibility || $currentVisibility !== $newVisibility)) {
+            // See only public bookmarks
+            $this->container->sessionManager->setSessionParameter(
+                SessionManager::KEY_VISIBILITY,
+                $newVisibility
+            );
+        } else {
+            $this->container->sessionManager->deleteSessionParameter(SessionManager::KEY_VISIBILITY);
+        }
+
+        return $this->redirectFromReferer($response, ['visibility']);
+    }
+
+    /**
+     * GET /untagged-only: allows to display only bookmarks without any tag
+     */
+    public function untaggedOnly(Request $request, Response $response): Response
+    {
+        $this->container->sessionManager->setSessionParameter(
+            SessionManager::KEY_UNTAGGED_ONLY,
+            empty($this->container->sessionManager->getSessionParameter(SessionManager::KEY_UNTAGGED_ONLY))
+        );
+
+        return $this->redirectFromReferer($response, ['untaggedonly', 'untagged-only']);
+    }
+}

application/front/controllers/ShaarliController.php

@@ -6,6 +6,7 @@
 
 use Shaarli\Bookmark\BookmarkFilter;
 use Shaarli\Container\ShaarliContainer;
+use Slim\Http\Response;
 
 abstract class ShaarliController
 {
@@ -80,4 +81,46 @@ protected function executeDefaultHooks(string $template): void
             $this->assignView('plugins_' . $name, $plugin_data);
         }
     }
+
+    /**
+     * Generates a redirection to the previous page, based on the HTTP_REFERER.
+     * It fails back to the home page.
+     *
+     * @param array $loopTerms   Terms to remove from path and query string to prevent direction loop.
+     * @param array $clearParams List of parameter to remove from the query string of the referrer.
+     */
+    protected function redirectFromReferer(Response $response, array $loopTerms = [], array $clearParams = []): Response
+    {
+        $defaultPath = './';
+        $referer = $this->container->environment['HTTP_REFERER'] ?? null;
+
+        if (null !== $referer) {
+            $currentUrl = parse_url($referer);
+            parse_str($currentUrl['query'] ?? '', $params);
+            $path = $currentUrl['path'] ?? $defaultPath;
+        } else {
+            $params = [];
+            $path = $defaultPath;
+        }
+
+        // Prevent redirection loop
+        if (isset($currentUrl)) {
+            foreach ($clearParams as $value) {
+                unset($params[$value]);
+            }
+
+            $checkQuery = implode('', array_keys($params));
+            foreach ($loopTerms as $value) {
+                if (strpos($path . $checkQuery, $value) !== false) {
+                    $params = [];
+                    $path = $defaultPath;
+                    break;
+                }
+            }
+        }
+
+        $queryString = count($params) > 0 ? '?'. http_build_query($params) : '';
+
+        return $response->withRedirect($path . $queryString);
+    }
 }

application/security/SessionManager.php

@@ -8,6 +8,10 @@
  */
 class SessionManager
 {
+    public const KEY_LINKS_PER_PAGE = 'LINKS_PER_PAGE';
+    public const KEY_VISIBILITY = 'visibility';
+    public const KEY_UNTAGGED_ONLY = 'untaggedonly';
+
     /** @var int Session expiration timeout, in seconds */
     public static $SHORT_TIMEOUT = 3600;    // 1 hour
 
@@ -212,4 +216,33 @@ public function getSessionParameter(string $key, $default = null)
     {
         return $this->session[$key] ?? $default;
     }
+
+    /**
+     * Store a variable in user session.
+     *
+     * @param string $key   Session key
+     * @param mixed  $value Session value to store
+     *
+     * @return $this
+     */
+    public function setSessionParameter(string $key, $value): self
+    {
+        $this->session[$key] = $value;
+
+        return $this;
+    }
+
+    /**
+     * Store a variable in user session.
+     *
+     * @param string $key   Session key
+     *
+     * @return $this
+     */
+    public function deleteSessionParameter(string $key): self
+    {
+        unset($this->session[$key]);
+
+        return $this;
+    }
 }

index.php

@@ -457,57 +457,19 @@ function renderPage($conf, $pluginManager, $bookmarkService, $history, $sessionM
 
     // -------- User wants to change the number of bookmarks per page (linksperpage=...)
     if (isset($_GET['linksperpage'])) {
-        if (is_numeric($_GET['linksperpage'])) {
-            $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
-        }
-
-        if (! empty($_SERVER['HTTP_REFERER'])) {
-            $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage'));
-        } else {
-            $location = '?';
-        }
-        header('Location: '. $location);
+        header('Location: ./links-per-page?nb='. $_GET['linksperpage']);
         exit;
     }
 
     // -------- User wants to see only private bookmarks (toggle)
     if (isset($_GET['visibility'])) {
-        if ($_GET['visibility'] === 'private') {
-            // Visibility not set or not already private, set private, otherwise reset it
-            if (empty($_SESSION['visibility']) || $_SESSION['visibility'] !== 'private') {
-                // See only private bookmarks
-                $_SESSION['visibility'] = 'private';
-            } else {
-                unset($_SESSION['visibility']);
-            }
-        } elseif ($_GET['visibility'] === 'public') {
-            if (empty($_SESSION['visibility']) || $_SESSION['visibility'] !== 'public') {
-                // See only public bookmarks
-                $_SESSION['visibility'] = 'public';
-            } else {
-                unset($_SESSION['visibility']);
-            }
-        }
-
-        if (! empty($_SERVER['HTTP_REFERER'])) {
-            $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('visibility'));
-        } else {
-            $location = '?';
-        }
-        header('Location: '. $location);
+        header('Location: ./visibility/'. $_GET['visibility']);
         exit;
     }
 
     // -------- User wants to see only untagged bookmarks (toggle)
     if (isset($_GET['untaggedonly'])) {
-        $_SESSION['untaggedonly'] = empty($_SESSION['untaggedonly']);
-
-        if (! empty($_SERVER['HTTP_REFERER'])) {
-            $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('untaggedonly'));
-        } else {
-            $location = '?';
-        }
-        header('Location: '. $location);
+        header('Location: ./untagged-only');
         exit;
     }
 
@@ -1549,6 +1511,19 @@ function install($conf, $sessionManager, $loginManager)
 
     $this->get('/add-tag/{newTag}', '\Shaarli\Front\Controller\TagController:addTag')->setName('add-tag');
     $this->get('/remove-tag/{tag}', '\Shaarli\Front\Controller\TagController:removeTag')->setName('remove-tag');
+
+    $this
+        ->get('/links-per-page', '\Shaarli\Front\Controller\SessionFilterController:linksPerPage')
+        ->setName('filter-links-per-page')
+    ;
+    $this
+        ->get('/visibility/{visibility}', '\Shaarli\Front\Controller\SessionFilterController:visibility')
+        ->setName('visibility')
+    ;
+    $this
+        ->get('/untagged-only', '\Shaarli\Front\Controller\SessionFilterController:untaggedOnly')
+        ->setName('untagged-only')
+    ;
 })->add('\Shaarli\Front\ShaarliMiddleware');
 
 $response = $app->run(true);

tests/front/controller/SessionFilterControllerTest.php

@@ -0,0 +1,290 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller;
+
+use PHPUnit\Framework\TestCase;
+use Shaarli\Security\SessionManager;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+class SessionFilterControllerTest extends TestCase
+{
+    use FrontControllerMockHelper;
+
+    /** @var SessionFilterController */
+    protected $controller;
+
+    public function setUp(): void
+    {
+        $this->createContainer();
+
+        $this->controller = new SessionFilterController($this->container);
+    }
+
+    /**
+     * Link per page - Default call with valid parameter and a referer.
+     */
+    public function testLinksPerPage(): void
+    {
+        $this->createValidContainerMockSet();
+
+        $this->container->environment = ['HTTP_REFERER' => 'http://shaarli/subfolder/controller/?searchtag=abc'];
+
+        $request = $this->createMock(Request::class);
+        $request->method('getParam')->with('nb')->willReturn('8');
+        $response = new Response();
+
+        $this->container->sessionManager
+            ->expects(static::once())
+            ->method('setSessionParameter')
+            ->with(SessionManager::KEY_LINKS_PER_PAGE, 8)
+        ;
+
+        $result = $this->controller->linksPerPage($request, $response);
+
+        static::assertInstanceOf(Response::class, $result);
+        static::assertSame(302, $result->getStatusCode());
+        static::assertSame(['/subfolder/controller/?searchtag=abc'], $result->getHeader('location'));
+    }
+
+    /**
+     * Link per page - Invalid value, should use default value (20)
+     */
+    public function testLinksPerPageNotValid(): void
+    {
+        $this->createValidContainerMockSet();
+
+        $request = $this->createMock(Request::class);
+        $request->method('getParam')->with('nb')->willReturn('test');
+        $response = new Response();
+
+        $this->container->sessionManager
+            ->expects(static::once())
+            ->method('setSessionParameter')
+            ->with(SessionManager::KEY_LINKS_PER_PAGE, 20)
+        ;
+
+        $result = $this->controller->linksPerPage($request, $response);
+
+        static::assertInstanceOf(Response::class, $result);
+        static::assertSame(302, $result->getStatusCode());
+        static::assertSame(['./'], $result->getHeader('location'));
+    }
+
+    /**
+     * Visibility - Default call for private filter while logged in without current value
+     */
+    public function testVisibility(): void
+    {
+        $this->createValidContainerMockSet();
+
+        $arg = ['visibility' => 'private'];
+
+        $this->container->environment = ['HTTP_REFERER' => 'http://shaarli/subfolder/controller/?searchtag=abc'];
+
+        $this->container->loginManager->method('isLoggedIn')->willReturn(true);
+        $this->container->sessionManager
+            ->expects(static::once())
+            ->method('setSessionParameter')
+            ->with(SessionManager::KEY_VISIBILITY, 'private')
+        ;
+
+        $request = $this->createMock(Request::class);
+        $response = new Response();
+
+        $result = $this->controller->visibility($request, $response, $arg);
+
+        static::assertInstanceOf(Response::class, $result);
+        static::assertSame(302, $result->getStatusCode());
+        static::assertSame(['/subfolder/controller/?searchtag=abc'], $result->getHeader('location'));
+    }
+
+    /**
+     * Visibility - Toggle off private visibility
+     */
+    public function testVisibilityToggleOff(): void
+    {
+        $this->createValidContainerMockSet();
+
+        $arg = ['visibility' => 'private'];
+
+        $this->container->environment = ['HTTP_REFERER' => 'http://shaarli/subfolder/controller/?searchtag=abc'];
+
+        $this->container->loginManager->method('isLoggedIn')->willReturn(true);
+        $this->container->sessionManager
+            ->method('getSessionParameter')
+            ->with(SessionManager::KEY_VISIBILITY)
+            ->willReturn('private')
+        ;
+        $this->container->sessionManager
+            ->expects(static::never())
+            ->method('setSessionParameter')
+        ;
+        $this->container->sessionManager
+            ->expects(static::once())
+            ->method('deleteSessionParameter')
+            ->with(SessionManager::KEY_VISIBILITY)
+        ;
+
+        $request = $this->createMock(Request::class);
+        $response = new Response();
+
+        $result = $this->controller->visibility($request, $response, $arg);
+
+        static::assertInstanceOf(Response::class, $result);
+        static::assertSame(302, $result->getStatusCode());
+        static::assertSame(['/subfolder/controller/?searchtag=abc'], $result->getHeader('location'));
+    }
+
+    /**
+     * Visibility - Change private to public
+     */
+    public function testVisibilitySwitch(): void
+    {
+        $this->createValidContainerMockSet();
+
+        $arg = ['visibility' => 'private'];
+
+        $this->container->loginManager->method('isLoggedIn')->willReturn(true);
+        $this->container->sessionManager
+            ->method('getSessionParameter')
+            ->with(SessionManager::KEY_VISIBILITY)
+            ->willReturn('public')
+        ;
+        $this->container->sessionManager
+            ->expects(static::once())
+            ->method('setSessionParameter')
+            ->with(SessionManager::KEY_VISIBILITY, 'private')
+        ;
+
+        $request = $this->createMock(Request::class);
+        $response = new Response();
+
+        $result = $this->controller->visibility($request, $response, $arg);
+
+        static::assertInstanceOf(Response::class, $result);
+        static::assertSame(302, $result->getStatusCode());
+        static::assertSame(['./'], $result->getHeader('location'));
+    }
+
+    /**
+     * Visibility - With invalid value - should remove any visibility setting
+     */
+    public function testVisibilityInvalidValue(): void
+    {
+        $this->createValidContainerMockSet();
+
+        $arg = ['visibility' => 'test'];
+
+        $this->container->environment = ['HTTP_REFERER' => 'http://shaarli/subfolder/controller/?searchtag=abc'];
+
+        $this->container->loginManager->method('isLoggedIn')->willReturn(true);
+        $this->container->sessionManager
+            ->expects(static::never())
+            ->method('setSessionParameter')
+        ;
+        $this->container->sessionManager
+            ->expects(static::once())
+            ->method('deleteSessionParameter')
+            ->with(SessionManager::KEY_VISIBILITY)
+        ;
+
+        $request = $this->createMock(Request::class);
+        $response = new Response();
+
+        $result = $this->controller->visibility($request, $response, $arg);
+
+        static::assertInstanceOf(Response::class, $result);
+        static::assertSame(302, $result->getStatusCode());
+        static::assertSame(['/subfolder/controller/?searchtag=abc'], $result->getHeader('location'));
+    }
+
+    /**
+     * Visibility - Try to change visibility while logged out
+     */
+    public function testVisibilityLoggedOut(): void
+    {
+        $this->createValidContainerMockSet();
+
+        $arg = ['visibility' => 'test'];
+
+        $this->container->environment = ['HTTP_REFERER' => 'http://shaarli/subfolder/controller/?searchtag=abc'];
+
+        $this->container->loginManager->method('isLoggedIn')->willReturn(false);
+        $this->container->sessionManager
+            ->expects(static::never())
+            ->method('setSessionParameter')
+        ;
+        $this->container->sessionManager
+            ->expects(static::never())
+            ->method('deleteSessionParameter')
+            ->with(SessionManager::KEY_VISIBILITY)
+        ;
+
+        $request = $this->createMock(Request::class);
+        $response = new Response();
+
+        $result = $this->controller->visibility($request, $response, $arg);
+
+        static::assertInstanceOf(Response::class, $result);
+        static::assertSame(302, $result->getStatusCode());
+        static::assertSame(['/subfolder/controller/?searchtag=abc'], $result->getHeader('location'));
+    }
+
+    /**
+     * Untagged only - valid call
+     */
+    public function testUntaggedOnly(): void
+    {
+        $this->createValidContainerMockSet();
+
+        $this->container->environment = ['HTTP_REFERER' => 'http://shaarli/subfolder/controller/?searchtag=abc'];
+
+        $request = $this->createMock(Request::class);
+        $response = new Response();
+
+        $this->container->sessionManager
+            ->expects(static::once())
+            ->method('setSessionParameter')
+            ->with(SessionManager::KEY_UNTAGGED_ONLY, true)
+        ;
+
+        $result = $this->controller->untaggedOnly($request, $response);
+
+        static::assertInstanceOf(Response::class, $result);
+        static::assertSame(302, $result->getStatusCode());
+        static::assertSame(['/subfolder/controller/?searchtag=abc'], $result->getHeader('location'));
+    }
+
+    /**
+     * Untagged only - toggle off
+     */
+    public function testUntaggedOnlyToggleOff(): void
+    {
+        $this->createValidContainerMockSet();
+
+        $this->container->environment = ['HTTP_REFERER' => 'http://shaarli/subfolder/controller/?searchtag=abc'];
+
+        $request = $this->createMock(Request::class);
+        $response = new Response();
+
+        $this->container->sessionManager
+            ->method('getSessionParameter')
+            ->with(SessionManager::KEY_UNTAGGED_ONLY)
+            ->willReturn(true)
+        ;
+        $this->container->sessionManager
+            ->expects(static::once())
+            ->method('setSessionParameter')
+            ->with(SessionManager::KEY_UNTAGGED_ONLY, false)
+        ;
+
+        $result = $this->controller->untaggedOnly($request, $response);
+
+        static::assertInstanceOf(Response::class, $result);
+        static::assertSame(302, $result->getStatusCode());
+        static::assertSame(['/subfolder/controller/?searchtag=abc'], $result->getHeader('location'));
+    }
+}

tests/front/controller/ShaarliControllerTest.php

@@ -6,6 +6,7 @@
 
 use PHPUnit\Framework\TestCase;
 use Shaarli\Bookmark\BookmarkFilter;
+use Slim\Http\Response;
 
 /**
  * Class ShaarliControllerTest
@@ -38,6 +39,14 @@ public function render(string $template): string
             {
                 return parent::render($template);
             }
+
+            public function redirectFromReferer(
+                Response $response,
+                array $loopTerms = [],
+                array $clearParams = []
+            ): Response {
+                return parent::redirectFromReferer($response, $loopTerms, $clearParams);
+            }
         };
         $this->assignedValues = [];
     }
@@ -91,4 +100,126 @@ public function testRender(): void
         static::assertSame('templateName', $this->assignedValues['plugins_footer']['render_footer']['target']);
         static::assertTrue($this->assignedValues['plugins_footer']['render_footer']['loggedin']);
     }
+
+    /**
+     * Test redirectFromReferer() - Default behaviour
+     */
+    public function testRedirectFromRefererDefault(): void
+    {
+        $this->createValidContainerMockSet();
+
+        $this->container->environment['HTTP_REFERER'] = 'http://shaarli.tld/subfolder/controller?query=param&other=2';
+
+        $response = new Response();
+
+        $result = $this->controller->redirectFromReferer($response);
+
+        static::assertSame(302, $result->getStatusCode());
+        static::assertSame(['/subfolder/controller?query=param&other=2'], $result->getHeader('location'));
+    }
+
+    /**
+     * Test redirectFromReferer() - With a loop term not matched in the referer
+     */
+    public function testRedirectFromRefererWithUnmatchedLoopTerm(): void
+    {
+        $this->createValidContainerMockSet();
+
+        $this->container->environment['HTTP_REFERER'] = 'http://shaarli.tld/subfolder/controller?query=param&other=2';
+
+        $response = new Response();
+
+        $result = $this->controller->redirectFromReferer($response, ['nope']);
+
+        static::assertSame(302, $result->getStatusCode());
+        static::assertSame(['/subfolder/controller?query=param&other=2'], $result->getHeader('location'));
+    }
+
+    /**
+     * Test redirectFromReferer() - With a loop term matching the referer in its path -> redirect to default
+     */
+    public function testRedirectFromRefererWithMatchingLoopTermInPath(): void
+    {
+        $this->createValidContainerMockSet();
+
+        $this->container->environment['HTTP_REFERER'] = 'http://shaarli.tld/subfolder/controller?query=param&other=2';
+
+        $response = new Response();
+
+        $result = $this->controller->redirectFromReferer($response, ['nope', 'controller']);
+
+        static::assertSame(302, $result->getStatusCode());
+        static::assertSame(['./'], $result->getHeader('location'));
+    }
+
+    /**
+     * Test redirectFromReferer() - With a loop term matching the referer in its query parameters -> redirect to default
+     */
+    public function testRedirectFromRefererWithMatchingLoopTermInQueryParam(): void
+    {
+        $this->createValidContainerMockSet();
+
+        $this->container->environment['HTTP_REFERER'] = 'http://shaarli.tld/subfolder/controller?query=param&other=2';
+
+        $response = new Response();
+
+        $result = $this->controller->redirectFromReferer($response, ['nope', 'other']);
+
+        static::assertSame(302, $result->getStatusCode());
+        static::assertSame(['./'], $result->getHeader('location'));
+    }
+
+    /**
+     * Test redirectFromReferer() - With a loop term matching the referer in its query value
+     *                              -> we do not block redirection for query parameter values.
+     */
+    public function testRedirectFromRefererWithMatchingLoopTermInQueryValue(): void
+    {
+        $this->createValidContainerMockSet();
+
+        $this->container->environment['HTTP_REFERER'] = 'http://shaarli.tld/subfolder/controller?query=param&other=2';
+
+        $response = new Response();
+
+        $result = $this->controller->redirectFromReferer($response, ['nope', 'param']);
+
+        static::assertSame(302, $result->getStatusCode());
+        static::assertSame(['/subfolder/controller?query=param&other=2'], $result->getHeader('location'));
+    }
+
+    /**
+     * Test redirectFromReferer() - With a loop term matching the referer in its domain name
+     *                              -> we do not block redirection for shaarli's hosts
+     */
+    public function testRedirectFromRefererWithLoopTermInDomain(): void
+    {
+        $this->createValidContainerMockSet();
+
+        $this->container->environment['HTTP_REFERER'] = 'http://shaarli.tld/subfolder/controller?query=param&other=2';
+
+        $response = new Response();
+
+        $result = $this->controller->redirectFromReferer($response, ['shaarli']);
+
+        static::assertSame(302, $result->getStatusCode());
+        static::assertSame(['/subfolder/controller?query=param&other=2'], $result->getHeader('location'));
+    }
+
+    /**
+     * Test redirectFromReferer() - With a loop term matching a query parameter AND clear this query param
+     *                              -> the param should be cleared before checking if it matches the redir loop terms
+     */
+    public function testRedirectFromRefererWithMatchingClearedParam(): void
+    {
+        $this->createValidContainerMockSet();
+
+        $this->container->environment['HTTP_REFERER'] = 'http://shaarli.tld/subfolder/controller?query=param&other=2';
+
+        $response = new Response();
+
+        $result = $this->controller->redirectFromReferer($response, ['query'], ['query']);
+
+        static::assertSame(302, $result->getStatusCode());
+        static::assertSame(['/subfolder/controller?other=2'], $result->getHeader('location'));
+    }
 }

tests/security/SessionManagerTest.php

@@ -269,4 +269,61 @@ public function testHasClientIpChanged()
         $this->session['ip'] = 'ip_id_one';
         $this->assertTrue($this->sessionManager->hasClientIpChanged('ip_id_two'));
     }
+
+    /**
+     * Test creating an entry in the session array
+     */
+    public function testSetSessionParameterCreate(): void
+    {
+        $this->sessionManager->setSessionParameter('abc', 'def');
+
+        static::assertSame('def', $this->session['abc']);
+    }
+
+    /**
+     * Test updating an entry in the session array
+     */
+    public function testSetSessionParameterUpdate(): void
+    {
+        $this->session['abc'] = 'ghi';
+
+        $this->sessionManager->setSessionParameter('abc', 'def');
+
+        static::assertSame('def', $this->session['abc']);
+    }
+
+    /**
+     * Test updating an entry in the session array with null value
+     */
+    public function testSetSessionParameterUpdateNull(): void
+    {
+        $this->session['abc'] = 'ghi';
+
+        $this->sessionManager->setSessionParameter('abc', null);
+
+        static::assertArrayHasKey('abc', $this->session);
+        static::assertNull($this->session['abc']);
+    }
+
+    /**
+     * Test deleting an existing entry in the session array
+     */
+    public function testDeleteSessionParameter(): void
+    {
+        $this->session['abc'] = 'def';
+
+        $this->sessionManager->deleteSessionParameter('abc');
+
+        static::assertArrayNotHasKey('abc', $this->session);
+    }
+
+    /**
+     * Test deleting a non existent entry in the session array
+     */
+    public function testDeleteSessionParameterNotExisting(): void
+    {
+        $this->sessionManager->deleteSessionParameter('abc');
+
+        static::assertArrayNotHasKey('abc', $this->session);
+    }
 }

tpl/default/linklist.paging.html

@@ -6,14 +6,14 @@
           {'Filters'|t}
         </span>
         {if="$is_logged_in"}
-        <a href="?visibility=private" aria-label="{'Only display private links'|t}" title="{'Only display private links'|t}"
+        <a href="./visibility/private" aria-label="{'Only display private links'|t}" title="{'Only display private links'|t}"
            class="{if="$visibility==='private'"}filter-on{else}filter-off{/if}"
         ><i class="fa fa-user-secret" aria-hidden="true"></i></a>
-        <a href="?visibility=public" aria-label="{'Only display public links'|t}" title="{'Only display public links'|t}"
+        <a href="./visibility/public" aria-label="{'Only display public links'|t}" title="{'Only display public links'|t}"
            class="{if="$visibility==='public'"}filter-on{else}filter-off{/if}"
         ><i class="fa fa-globe" aria-hidden="true"></i></a>
         {/if}
-        <a href="?untaggedonly" aria-label="{'Filter untagged links'|t}" title="{'Filter untagged links'|t}"
+        <a href="./untagged-only" aria-label="{'Filter untagged links'|t}" title="{'Filter untagged links'|t}"
            class={if="$untaggedonly"}"filter-on"{else}"filter-off"{/if}
         ><i class="fa fa-tag" aria-hidden="true"></i></a>
         <a href="#" aria-label="{'Select all'|t}" title="{'Select all'|t}"
@@ -53,11 +53,11 @@
 
     <div class="linksperpage pure-u-1-3">
       <div class="pure-u-0 pure-u-lg-visible">{'Links per page'|t}</div>
-      <a href="?linksperpage=20">20</a>
-      <a href="?linksperpage=50">50</a>
-      <a href="?linksperpage=100">100</a>
-      <form method="GET" class="pure-u-0 pure-u-lg-visible">
-        <input type="text" name="linksperpage" placeholder="133">
+      <a href="./links-per-page?nb=20">20</a>
+      <a href="./links-per-page?nb=50">50</a>
+      <a href="./links-per-page?nb=100">100</a>
+      <form method="GET" class="pure-u-0 pure-u-lg-visible" action="./links-per-page">
+        <input type="text" name="nb" placeholder="133">
       </form>
       <a href="#" class="filter-off fold-all pure-u-0 pure-u-lg-visible" aria-label="{'Fold all'|t}" title="{'Fold all'|t}">
         <i class="fa fa-chevron-up" aria-hidden="true"></i>

tpl/vintage/linklist.paging.html

@@ -1,7 +1,7 @@
 <div class="paging">
 {if="$is_logged_in"}
     <div class="paging_privatelinks">
-      <a href="?visibility=private">
+      <a href="./visibility/private">
 		{if="$visibility=='private'"}
       <img src="img/private_16x16_active.png" width="16" height="16" title="Click to see all links" alt="Click to see all links">
     {else}
@@ -23,8 +23,13 @@
       </div>
     {/loop}
     <div class="paging_linksperpage">
-        Links per page: <a href="?linksperpage=20">20</a> <a href="?linksperpage=50">50</a> <a href="?linksperpage=100">100</a>
-        <form method="GET" class="linksperpage"><input type="text" name="linksperpage" size="2"></form>
+        Links per page:
+        <a href="./links-per-page?nb=20">20</a>
+        <a href="./links-per-page?nb=50">50</a>
+        <a href="./links-per-page?nb=100">100</a>
+        <form method="GET" class="linksperpage" action="./links-per-page">
+          <input type="text" name="nb" size="2">
+        </form>
     </div>
     {if="$previous_page_url"} <a href="{$previous_page_url}" class="paging_older">&#x25C4;Older</a> {/if}
     <div class="paging_current">page {$page_current} / {$page_max} </div>