feat: implementa plugin de favoritos via REST API

favorite-posts/favorite-posts.php

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+<?php
+/**
+ * Plugin Name: Favorite Posts
+ * Description: Permite favoritar posts via REST API.
+ * Version: 1.0
+ * Author: Pedro Marcusso
+ */
+
+defined('ABSPATH') || exit;
+
+$includes = plugin_dir_path(__FILE__) . 'includes/';
+require_once $includes . 'install.php';
+require_once $includes . 'functions.php';
+require_once $includes . 'routes.php';
+
+register_activation_hook(__FILE__, 'fp_create_favorites_table');

favorite-posts/includes/functions.php

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+<?php
+
+function fp_toggle_favorite($data)
+{
+    global $wpdb;
+
+    $user_id = get_current_user_id();
+    $post_id = (int) $data['post_id'];
+    $table_name = $wpdb->prefix . 'favorite_posts';
+
+    $exists = $wpdb->get_var($wpdb->prepare(
+        "SELECT id FROM $table_name WHERE user_id = %d AND post_id = %d",
+        $user_id, $post_id
+    ));
+
+    if ($exists) {
+        $wpdb->delete($table_name, ['id' => $exists]);
+        return ['status' => 'removed'];
+    } else {
+        $wpdb->insert($table_name, ['user_id' => $user_id, 'post_id' => $post_id]);
+        return ['status' => 'added'];
+    }
+}

favorite-posts/includes/install.php

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+<?php
+
+function fp_create_favorites_table()
+{
+    global $wpdb;
+
+    $table_name = $wpdb->prefix . 'favorite_posts';
+    $charset_collate = $wpdb->get_charset_collate();
+
+    $sql = "CREATE TABLE IF NOT EXISTS $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 (user_id, post_id)
+    ) $charset_collate;";
+
+    require_once ABSPATH . 'wp-admin/includes/upgrade.php';
+    dbDelta($sql);
+}   

favorite-posts/includes/routes.php

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+<?php
+
+add_action('rest_api_init', function () {
+    register_rest_route('favorite-posts/v1', '/toggle/(?P<post_id>\d+)', [
+        'methods' => 'POST',
+        'callback' => 'fp_toggle_favorite',
+        'permission_callback' => function () {
+            return is_user_logged_in();
+        }
+    ]);
+});