WPCOM_JSON_API_Endpoint::get_author PHP Method

    function get_author($author, $show_email = false)
    {
        if (isset($author->comment_author_email) && !$author->user_id) {
            $ID = 0;
            $login = '';
            $email = $author->comment_author_email;
            $name = $author->comment_author;
            $first_name = '';
            $last_name = '';
            $URL = $author->comment_author_url;
            $avatar_URL = $this->api->get_avatar_url($author);
            $profile_URL = 'https://en.gravatar.com/' . md5(strtolower(trim($email)));
            $nice = '';
            $site_id = -1;
            // Comment author URLs and Emails are sent through wp_kses() on save, which replaces "&" with "&"
            // "&" is the only email/URL character altered by wp_kses()
            foreach (array('email', 'URL') as $field) {
                ${$field} = str_replace('&', '&', ${$field});
            }
        } else {
            if (isset($author->user_id) && $author->user_id) {
                $author = $author->user_id;
            } elseif (isset($author->user_email)) {
                $author = $author->ID;
            } elseif (isset($author->post_author)) {
                // then $author is a Post Object.
                if (0 == $author->post_author) {
                    return null;
                }
                /**
                 * Filter whether the current site is a Jetpack site.
                 *
                 * @module json-api
                 *
                 * @since 3.3.0
                 *
                 * @param bool false Is the current site a Jetpack site. Default to false.
                 * @param int get_current_blog_id() Blog ID.
                 */
                $is_jetpack = true === apply_filters('is_jetpack_site', false, get_current_blog_id());
                $post_id = $author->ID;
                if ($is_jetpack && (defined('IS_WPCOM') && IS_WPCOM)) {
                    $ID = get_post_meta($post_id, '_jetpack_post_author_external_id', true);
                    $email = get_post_meta($post_id, '_jetpack_author_email', true);
                    $login = '';
                    $name = get_post_meta($post_id, '_jetpack_author', true);
                    $first_name = '';
                    $last_name = '';
                    $URL = '';
                    $nice = '';
                } else {
                    $author = $author->post_author;
                }
            }
            if (!isset($ID)) {
                $user = get_user_by('id', $author);
                if (!$user || is_wp_error($user)) {
                    trigger_error('Unknown user', E_USER_WARNING);
                    return null;
                }
                $ID = $user->ID;
                $email = $user->user_email;
                $login = $user->user_login;
                $name = $user->display_name;
                $first_name = $user->first_name;
                $last_name = $user->last_name;
                $URL = $user->user_url;
                $nice = $user->user_nicename;
            }
            if (defined('IS_WPCOM') && IS_WPCOM && !$is_jetpack) {
                $active_blog = get_active_blog_for_user($ID);
                $site_id = $active_blog->blog_id;
                $profile_URL = "https://en.gravatar.com/{$login}";
            } else {
                $profile_URL = 'https://en.gravatar.com/' . md5(strtolower(trim($email)));
                $site_id = -1;
            }
            $avatar_URL = $this->api->get_avatar_url($email);
        }
        $email = $show_email ? (string) $email : false;
        $author = array('ID' => (int) $ID, 'login' => (string) $login, 'email' => $email, 'name' => (string) $name, 'first_name' => (string) $first_name, 'last_name' => (string) $last_name, 'nice_name' => (string) $nice, 'URL' => (string) esc_url_raw($URL), 'avatar_URL' => (string) esc_url_raw($avatar_URL), 'profile_URL' => (string) esc_url_raw($profile_URL));
        if ($site_id > -1) {
            $author['site_ID'] = (int) $site_id;
        }
        return (object) $author;
    }