3 files changed, 157 insertions, 0 deletions

diff --git a/application/front/controllers/SessionFilterController.php b/application/front/controllers/SessionFilterController.php
new file mode 100644
index 00000000..a021dc37
--- /dev/null
+++ b/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']);
+    }
+}
diff --git a/application/front/controllers/ShaarliController.php b/application/front/controllers/ShaarliController.php
index 0c5d363e..bfff5fcf 100644
--- a/application/front/controllers/ShaarliController.php
+++ b/application/front/controllers/ShaarliController.php
@@ -6,6 +6,7 @@ namespace Shaarli\Front\Controller;
 
 use Shaarli\Bookmark\BookmarkFilter;
 use Shaarli\Container\ShaarliContainer;
+use Slim\Http\Response;
 
 abstract class ShaarliController
 {
@@ -80,4 +81,46 @@ abstract class ShaarliController
             $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);
+    }
 }
diff --git a/application/security/SessionManager.php b/application/security/SessionManager.php
index 4ae99168..8b77d362 100644
--- a/application/security/SessionManager.php
+++ b/application/security/SessionManager.php
@@ -8,6 +8,10 @@ use Shaarli\Config\ConfigManager;
  */
 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 @@ class SessionManager
     {
         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;
+    }
 }