Add temporary links

Fixes #4.
Also removes statistics since those have been replaced by GoatCounter anyway.

dist/index.php

@@ -23,7 +23,6 @@ $needs_confirmation = false;
 try {
     $links = new Links(".links.db", "links.sql");
     list($target, $needs_confirmation) = $links->getTarget($path);
-    $links->handleVisit($path);
 } catch (Exception $exception) {
     $error = true;
 }
@@ -63,7 +62,7 @@ if ($target != null && !$needs_confirmation) {
                 <h3>Internal server error</h3>
                 <p>Something went wrong internally, and you could not be redirected. Please try again later.</p>
                 <?php
-            } else if ($target != null && $needs_confirmation) {
+            } else if ($needs_confirmation) {
                 ?>
                 <h3>Confirm redirect</h3>
                 <p>This URL redirects to <b><?= $target ?></b>.</p>
@@ -107,7 +106,7 @@ if ($target != null && !$needs_confirmation) {
         $("#header").appendChild(header({title: "fwdkr.co"}));
         $("#footer").appendChild(footer({
             vcsURL: "https://git.fwdekker.com/FWDekker/fwdkr.co/",
-            version: "v1.3.4"
+            version: "v1.4.0"
         }));
     });
 </script>

dist/links.php

@@ -28,6 +28,8 @@ class Links
             $this->db = new SQLite3($database, SQLITE3_OPEN_READWRITE);
         }
         $this->db->enableExceptions(true);
+
+        $this->deleteExpiredLinks();
     }
 
     /**
@@ -57,15 +59,12 @@ class Links
     }
 
     /**
-     * Increments the visit counter and visit date of the given path.
-     *
-     * @param string $path the path to handle a visit to
+     * Deletes all expired links.
      */
-    function handleVisit(string $path)
-    {
-        $stmt = $this->db->prepare("UPDATE links SET visits = visits + 1, last_visit = CURRENT_TIMESTAMP 
-                                    WHERE path = :path;");
-        $stmt->bindValue(":path", $path);
+    function deleteExpiredLinks(): void {
+        $now = date("Y-m-d H:i:s");
+        $stmt = $this->db->prepare("DELETE FROM links WHERE expires_at < :now;");
+        $stmt->bindValue(":now", $now);
         $stmt->execute();
     }
 }

dist/links.sql

@@ -5,9 +5,8 @@ create table links
         constraint links_pk
             primary key,
     target             text not null,
-    needs_confirmation boolean default false not null,
-    visits             int     default 0 not null,
-    last_visit         text
+    needs_confirmation boolean  default false not null,
+    expires_at         datetime default null
 );
 
 create unique index links_path_uindex