From 0ece2102bd7522c734b26caa034310a96297db85 Mon Sep 17 00:00:00 2001
From: MateusBreno <brenoconstantino80@gmail.com>
Date: Tue, 24 Mar 2026 23:27:32 -0400
Subject: [PATCH] Implement WordPress plugin for favoriting posts with REST API
 and custom table

---
 apiki-favorites/apiki-favorites.php           |  47 +++++++
 .../includes/class-apiki-favorites-db.php     |  36 +++++
 .../class-apiki-favorites-rest-controller.php | 131 ++++++++++++++++++
 3 files changed, 214 insertions(+)
 create mode 100644 apiki-favorites/apiki-favorites.php
 create mode 100644 apiki-favorites/includes/class-apiki-favorites-db.php
 create mode 100644 apiki-favorites/includes/class-apiki-favorites-rest-controller.php

diff --git a/apiki-favorites/apiki-favorites.php b/apiki-favorites/apiki-favorites.php
new file mode 100644
index 00000000..96ed4179
--- /dev/null
+++ b/apiki-favorites/apiki-favorites.php
@@ -0,0 +1,47 @@
+<?php
+/**
+ * Plugin Name: Apiki Favorites
+ * Description: Um plugin para permitir que usuários logados favoritem posts.
+ * Version: 1.0.0
+ * Author: MateusBreno
+ * License: GPL2
+ */
+
+declare(strict_types=1);
+
+if (!defined("ABSPATH")) {
+    exit;
+}
+
+define("APIKI_FAVORITES_PATH", plugin_dir_path(__FILE__));
+
+require_once APIKI_FAVORITES_PATH . "includes/class-apiki-favorites-db.php";
+require_once APIKI_FAVORITES_PATH . "includes/class-apiki-favorites-rest-controller.php";
+
+class Apiki_Favorites
+{
+    public function __construct()
+    {
+        register_activation_hook(__FILE__, [$this, "activate"]);
+        register_deactivation_hook(__FILE__, [$this, "deactivate"]);
+
+        add_action("plugins_loaded", [$this, "init_plugin"]);
+    }
+
+    public function activate(): void
+    {
+        Apiki_Favorites_DB::create_favorites_table();
+    }
+
+    public function deactivate(): void
+    {
+        Apiki_Favorites_DB::drop_favorites_table();
+    }
+
+    public function init_plugin(): void
+    {
+        new Apiki_Favorites_REST_Controller();
+    }
+}
+
+new Apiki_Favorites();
diff --git a/apiki-favorites/includes/class-apiki-favorites-db.php b/apiki-favorites/includes/class-apiki-favorites-db.php
new file mode 100644
index 00000000..fc0be17d
--- /dev/null
+++ b/apiki-favorites/includes/class-apiki-favorites-db.php
@@ -0,0 +1,36 @@
+<?php
+
+declare(strict_types=1);
+
+if (!defined("ABSPATH")) {
+    exit;
+}
+
+class Apiki_Favorites_DB
+{
+    public static function create_favorites_table(): void
+    {
+        global $wpdb;
+        $table_name = $wpdb->prefix . "apiki_favorites";
+
+        $charset_collate = $wpdb->get_charset_collate();
+
+        $sql = "CREATE TABLE $table_name (
+            id bigint(20) UNSIGNED NOT NULL AUTO_INCREMENT,
+            user_id bigint(20) UNSIGNED NOT NULL,
+            post_id bigint(20) UNSIGNED NOT NULL,
+            PRIMARY KEY  (id),
+            UNIQUE KEY user_post_id (user_id, post_id)
+        ) $charset_collate;";
+
+        require_once ABSPATH . "wp-admin/includes/upgrade.php";
+        dbDelta($sql);
+    }
+
+    public static function drop_favorites_table(): void
+    {
+        global $wpdb;
+        $table_name = $wpdb->prefix . "apiki_favorites";
+        $wpdb->query("DROP TABLE IF EXISTS $table_name");
+    }
+}
diff --git a/apiki-favorites/includes/class-apiki-favorites-rest-controller.php b/apiki-favorites/includes/class-apiki-favorites-rest-controller.php
new file mode 100644
index 00000000..107573b3
--- /dev/null
+++ b/apiki-favorites/includes/class-apiki-favorites-rest-controller.php
@@ -0,0 +1,131 @@
+<?php
+
+declare(strict_types=1);
+
+if (!defined("ABSPATH")) {
+    exit;
+}
+
+class Apiki_Favorites_REST_Controller
+{
+    private string $namespace = "apiki/v1";
+    private string $base = "favorites";
+
+    public function __construct()
+    {
+        add_action("rest_api_init", [$this, "register_routes"]);
+    }
+
+    public function register_routes(): void
+    {
+        register_rest_route(
+            $this->namespace,
+            "/" . $this->base . "/(?P<post_id>\d+)",
+            [
+                [
+                    "methods" => WP_REST_Server::CREATABLE,
+                    "callback" => [$this, "add_favorite"],
+                    "permission_callback" => [$this, "permission_check"],
+                    "args" => [
+                        "post_id" => [
+                            "validate_callback" => function ($param, $request, $key) {
+                                return is_numeric($param);
+                            },
+                        ],
+                    ],
+                ],
+                [
+                    "methods" => WP_REST_Server::DELETABLE,
+                    "callback" => [$this, "remove_favorite"],
+                    "permission_callback" => [$this, "permission_check"],
+                    "args" => [
+                        "post_id" => [
+                            "validate_callback" => function ($param, $request, $key) {
+                                return is_numeric($param);
+                            },
+                        ],
+                    ],
+                ],
+            ]
+        );
+    }
+
+    public function permission_check(WP_REST_Request $request): bool
+    {
+        return is_user_logged_in();
+    }
+
+    public function add_favorite(WP_REST_Request $request): WP_REST_Response
+    {
+        global $wpdb;
+        $user_id = get_current_user_id();
+        $post_id = (int) $request["post_id"];
+
+        if (!get_post($post_id)) {
+            return new WP_REST_Response(
+                ["message" => "Post not found."],
+                404
+            );
+        }
+
+        $table_name = $wpdb->prefix . "apiki_favorites";
+
+        $data = [
+            "user_id" => $user_id,
+            "post_id" => $post_id,
+        ];
+
+        $format = ["%d", "%d"];
+
+        $inserted = $wpdb->insert($table_name, $data, $format);
+
+        if ($inserted === false) {
+            return new WP_REST_Response(
+                ["message" => "Error adding favorite or already favorited."],
+                400
+            );
+        }
+
+        return new WP_REST_Response(
+            ["message" => "Post favorited successfully."],
+            200
+        );
+    }
+
+    public function remove_favorite(WP_REST_Request $request): WP_REST_Response
+    {
+        global $wpdb;
+        $user_id = get_current_user_id();
+        $post_id = (int) $request["post_id"];
+
+        $table_name = $wpdb->prefix . "apiki_favorites";
+
+        $deleted = $wpdb->delete(
+            $table_name,
+            [
+                "user_id" => $user_id,
+                "post_id" => $post_id,
+            ],
+            ["%d", "%d"]
+        );
+
+        if ($deleted === false) {
+            return new WP_REST_Response(
+                ["message" => "Error removing favorite."],
+                400
+            );
+        }
+
+        if ($deleted === 0) {
+            return new WP_REST_Response(
+                ["message" => "Favorite not found to remove."],
+                404
+            );
+        }
+
+        return new WP_REST_Response(
+            ["message" => "Post unfavorited successfully."],
+            200
+        );
+    }
+}