Add files via upload

includes/wpbm-admin-page.php

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+<?php
+// Function to create the admin page
+function wpbm_bookmarklet_page() {
+    $plugin_url = plugins_url('', __FILE__);
+    $site_url = site_url();
+
+    $bookmarklet_code = "
+    javascript:(function(){var t=encodeURIComponent(document.title),d=document.querySelector('meta[name=\"description\"]'),u=encodeURIComponent(window.location.href),i=document.querySelector('meta[property=\"og:image\"]');d=d?encodeURIComponent(d.content):'No description available';i=i?encodeURIComponent(i.content):'No image available';var r=\"$site_url/wp-admin/post-new.php?post_type=post\";r+=\"&title=\"+t+\"&content=\"+d+\"&wpbm_url=\"+u+\"&wpbm_og_image=\"+i;window.location.href=r;})();
+    ";
+
+    ?>
+    <div class="wrap">
+    <h1><?php echo esc_html__('Bookmarklet', 'wpbm'); ?></h1>
+    <p><?php echo esc_html__('Copy the code below and paste it as a new browser bookmark\'s URL.', 'wpbm'); ?></p>
+    <textarea rows="5" cols="50" id="bookmarklet-code"><?php echo esc_textarea($bookmarklet_code); ?></textarea>
+    </div>
+    <?php
+}
+
+// Add the admin menu page
+function wpbm_add_admin_menu() {
+    add_management_page('Bookmarklet', 'Bookmarklet', 'manage_options', 'wpbm-bookmarklet', 'wpbm_bookmarklet_page');
+}
+add_action('admin_menu', 'wpbm_add_admin_menu');

includes/wpbm-handle-bookmarklet.php

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+<?php
+function wpbm_set_featured_image($post_id, $og_image_url) {
+    // Need to require these files
+    if (!function_exists('media_handle_upload')) {
+        require_once(ABSPATH . "wp-admin" . '/includes/image.php');
+        require_once(ABSPATH . "wp-admin" . '/includes/file.php');
+        require_once(ABSPATH . "wp-admin" . '/includes/media.php');
+    }
+
+    // Upload file to WordPress library
+    $tmp = download_url($og_image_url);
+    $file_array = array(
+        'name' => basename($og_image_url),
+        'tmp_name' => $tmp
+    );
+
+    // Check for download errors
+    if (is_wp_error($tmp)) {
+        @unlink($file_array['tmp_name']);
+        return $tmp;
+    }
+
+    // Handle the media upload
+    $id = media_handle_sideload($file_array, $post_id);
+
+    // Check for handle sideload errors.
+    if (is_wp_error($id)) {
+        @unlink($file_array['tmp_name']);
+        return $id;
+    }
+
+    // Set the featured image for the post
+    set_post_thumbnail($post_id, $id);
+}
+
+function wpbm_handle_bookmarklet() {
+    if (!is_user_logged_in()) {
+        wp_redirect(wp_login_url(get_permalink()));
+        exit;
+    }
+
+    $post_id = wp_insert_post();
+
+    // Set the featured image for the new post
+    wpbm_set_featured_image($post_id, $og_image);
+
+    // Redirect to the new post page
+    wp_redirect(admin_url('post.php?post=' . $post_id . '&action=edit'));
+    exit;
+}
+
+add_action('wp_ajax_wpbm_handle_bookmarklet', 'wpbm_handle_bookmarklet');
+add_action('wp_ajax_nopriv_wpbm_handle_bookmarklet', 'wpbm_handle_bookmarklet');

includes/wpbm-post.php

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+<?php
+function wpbm_modify_post_title($title) {
+    if (isset($_GET['title'])) {
+        $title = sanitize_text_field($_GET['title']);
+    }
+
+    return $title;
+}
+add_filter('default_title', 'wpbm_modify_post_title');
+
+function wpbm_modify_post_content($content) {
+    if (isset($_GET['content']) && isset($_GET['wpbm_url']) && isset($_GET['wpbm_og_image'])) {
+        $description = sanitize_text_field($_GET['content']);
+        $url = filter_var($_GET['wpbm_url'], FILTER_SANITIZE_URL);
+        $og_image = filter_var($_GET['wpbm_og_image'], FILTER_SANITIZE_URL);
+
+        // Create the post content
+        $content = '<img src="' . $og_image . '" />';
+        $content .= '<p>' . $description . '</p>';
+        $content .= '<p><a href="' . $url . '">Read more</a></p>';
+    }
+    return $content;
+}
+add_filter('default_content', 'wpbm_modify_post_content');

wp-bookmark.php

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+<?php
+/*
+Plugin Name: WP Bookmark
+Description: A bookmarking plugin for WordPress.
+Version: 0.1
+Author: Billy Wilcosky
+Author URI: https://wilcosky.com
+License: GPL-2.0+
+*/
+
+// Include necessary files
+include(plugin_dir_path(__FILE__) . 'includes/wpbm-admin-page.php');
+include(plugin_dir_path(__FILE__) . 'includes/wpbm-post.php');
+include(plugin_dir_path(__FILE__) . 'includes/wpbm-handle-bookmarklet.php');