Eliminando el soporte de Gravatar.com para WordPress y Avatares locales simples

Actualmente estoy usando Avatares locales simples en varios de mis blogs, lo que permite a las personas cargar su propio avatar personalizado.

Hasta donde yo sé, Simple Local Avatars usa get_avatarpara verificar si se selecciona un avatar personalizado, si no es por defecto Gravatar.com.

¿Sería posible deshabilitar el bit Gravatar.com de alguna manera, deshabilitando Gravatar.com por completo y devolviendo solo una imagen local alojada si no se selecciona un avatar personalizado?

Espero que esté bien publicar esto aquí, pero este sería el archivo de Avatares locales simples

<?php
/*
Plugin Name: Simple Local Avatars
Plugin URI: http://www.get10up.com/plugins/simple-local-avatars-wordpress/
Description: Adds an avatar upload field to user profiles if the current user has media permissions. Generates requested sizes on demand just like Gravatar! Simple and lightweight.
Version: 1.2.3
Author: Jake Goldman (10up), Oomph Inc
Author URI: http://www.get10up.com
*/

// add field to user profiles
class simple_local_avatars {
    function simple_local_avatars() {
        add_filter('get_avatar', array($this, 'get_avatar'), 10, 5);
        add_action('admin_init', array($this, 'admin_init'));
        add_action('show_user_profile', array($this, 'edit_user_profile'));
        add_action('edit_user_profile', array($this, 'edit_user_profile'));
        add_action('personal_options_update', array($this, 'edit_user_profile_update'));
        add_action('edit_user_profile_update', array($this, 'edit_user_profile_update'));
        add_filter('avatar_defaults', array($this, 'avatar_defaults'));
    }

    function get_avatar($avatar = '', $id_or_email, $size = '96', $default = '', $alt = false) {
        if (is_numeric($id_or_email))
            $user_id = (int) $id_or_email;
        elseif (is_string($id_or_email)) {
            if ($user = get_user_by_email($id_or_email))
                $user_id = $user->ID;
        } elseif (is_object($id_or_email) && !empty($id_or_email->user_id))
            $user_id = (int) $id_or_email->user_id;
        if (!empty($user_id))
            $local_avatars = get_user_meta($user_id, 'simple_local_avatar', true);
        if (!isset($local_avatars) || empty($local_avatars) || !isset($local_avatars['full'])) {
            if (!empty($avatar)) // if called by filter
                return $avatar;
            remove_filter('get_avatar', 'get_simple_local_avatar');
            $avatar = get_avatar($id_or_email, $size, $default);
            add_filter('get_avatar', 'get_simple_local_avatar', 10, 5);
            return $avatar;
        }
        if (!is_numeric($size)) // ensure valid size
            $size = '96';
        if (empty($alt))
            $alt = get_the_author_meta('display_name', $user_id);
        // generate a new size
        if (empty($local_avatars[$size])) {
            $upload_path = wp_upload_dir();
            $avatar_full_path = str_replace($upload_path['baseurl'], $upload_path['basedir'], $local_avatars['full']);
            $image_sized = image_resize($avatar_full_path, $size, $size, true);
            if (is_wp_error($image_sized)) // deal with original being >= to original image (or lack of sizing ability)
                $local_avatars[$size] = $local_avatars['full'];
            else
                $local_avatars[$size] = str_replace($upload_path['basedir'], $upload_path['baseurl'], $image_sized);
            update_user_meta($user_id, 'simple_local_avatar', $local_avatars);
        } elseif (substr($local_avatars[$size], 0, 4) != 'http')
            $local_avatars[$size] = site_url($local_avatars[$size]);
        $author_class = is_author($user_id) ? ' current-author' : '';
        $avatar = "<img alt='" . esc_attr($alt) . "' src='" . $local_avatars[$size] . "' class='avatar avatar-{$size}{$author_class} photo' height='{$size}' width='{$size}' />";
        return $avatar;
    }

    function admin_init() {
        load_plugin_textdomain('simple-local-avatars', false, dirname(plugin_basename(__FILE__)) . '/localization/');
        register_setting('discussion', 'simple_local_avatars_caps', array($this, 'sanitize_options'));
        add_settings_field('simple-local-avatars-caps', __('Local Avatar Permissions', 'simple-local-avatars'), array($this, 'avatar_settings_field'), 'discussion', 'avatars');
    }

    function sanitize_options($input) {
        $new_input['simple_local_avatars_caps'] = empty($input['simple_local_avatars_caps']) ? 0 : 1;
        return $new_input;
    }

    function avatar_settings_field($args) {
        $options = get_option('simple_local_avatars_caps');
        echo '
            <label for="simple_local_avatars_caps">
                <input type="checkbox" name="simple_local_avatars_caps" id="simple_local_avatars_caps" value="1" ' . @checked($options['simple_local_avatars_caps'], 1, false) . ' />
                ' . __('Only allow users with file upload capabilities to upload local avatars (Authors and above)', 'simple-local-avatars') . '
            </label>
        ';
    }

    function edit_user_profile($profileuser) {
        ?>
        <h3><?php _e('Avatar', 'simple-local-avatars'); ?></h3>
        <table class="form-table">
            <tr>
                <th><label for="simple-local-avatar"><?php _e('Upload Avatar', 'simple-local-avatars'); ?></label></th>
                <td style="width: 50px;" valign="top">
                    <?php echo get_avatar($profileuser->ID); ?>
                </td>
                <td>
                    <?php
                    $options = get_option('simple_local_avatars_caps');
                    if (empty($options['simple_local_avatars_caps']) || current_user_can('upload_files')) {
                        do_action('simple_local_avatar_notices');
                        wp_nonce_field('simple_local_avatar_nonce', '_simple_local_avatar_nonce', false);
                    ?>
                    <input type="file" name="simple-local-avatar" id="simple-local-avatar" /><br />
                    <?php
                    if (empty($profileuser->simple_local_avatar))
                        echo '<span class="description">' . __('No local avatar is set. Use the upload field to add a local avatar.', 'simple-local-avatars') . '</span>';
                    else
                        echo '
                            <input type="checkbox" name="simple-local-avatar-erase" value="1" /> ' . __('Delete local avatar', 'simple-local-avatars') . '<br />
                            <span class="description">' . __('Replace the local avatar by uploading a new avatar, or erase the local avatar (falling back to a gravatar) by checking the delete option.', 'simple-local-avatars') . '</span>
                        ';
                    } else {
                        if (empty($profileuser->simple_local_avatar))
                            echo '<span class="description">' . __('No local avatar is set. Set up your avatar at Gravatar.com.', 'simple-local-avatars') . '</span>';
                        else
                            echo '<span class="description">' . __('You do not have media management permissions. To change your local avatar, contact the blog administrator.', 'simple-local-avatars') . '</span>';
                    }
                    ?>
                </td>
            </tr>
        </table>
        <script type="text/javascript">
            var form = document.getElementById('your-profile');
            form.encoding = 'multipart/form-data';
            form.setAttribute('enctype', 'multipart/form-data');
        </script>
        <?php
    }

    function edit_user_profile_update($user_id) {
        if (!wp_verify_nonce($_POST['_simple_local_avatar_nonce'], 'simple_local_avatar_nonce')) //security
            return;
        if (!empty($_FILES['simple-local-avatar']['name'])) {
            $mimes = array(
                'jpg|jpeg|jpe' => 'image/jpeg',
                'gif' => 'image/gif',
                'png' => 'image/png',
                'bmp' => 'image/bmp',
                'tif|tiff' => 'image/tiff'
            );
            $avatar = wp_handle_upload($_FILES['simple-local-avatar'], array('mimes' => $mimes, 'test_form' => false));
            if (empty($avatar['file'])) // handle failures
                {
                switch ($avatar['error']) {
                    case 'File type does not meet security guidelines. Try another.':
                        add_action('user_profile_update_errors', create_function('$a', '$a->add("avatar_error",__("Please upload a valid image file for the avatar.","simple-local-avatars"));'));
                        break;
                    default:
                        add_action('user_profile_update_errors', create_function('$a', '$a->add("avatar_error","<strong>".__("There was an error uploading the avatar:","simple-local-avatars")."</strong> ' . esc_attr($avatar['error']) . '");'));
                }
                return;
            }
            $this->avatar_delete($user_id); // delete old images if successful
            update_user_meta($user_id, 'simple_local_avatar', array('full' => $avatar['url'])); // save user information (overwriting old)
        } elseif (isset($_POST['simple-local-avatar-erase']) && $_POST['simple-local-avatar-erase'] == 1)
            $this->avatar_delete($user_id);
    }

    // remove the custom get_avatar hook for the default avatar list output on options-discussion.php
    function avatar_defaults($avatar_defaults) {
        remove_action('get_avatar', array($this, 'get_avatar'));
        return $avatar_defaults;
    }

    // delete avatars based on user_id
    function avatar_delete($user_id) {
        $old_avatars = get_user_meta($user_id, 'simple_local_avatar', true);
        $upload_path = wp_upload_dir();
        if (is_array($old_avatars)) {
            foreach ($old_avatars as $old_avatar) {
                $old_avatar_path = str_replace($upload_path['baseurl'], $upload_path['basedir'], $old_avatar);
                @unlink($old_avatar_path);
            }
        }
        delete_user_meta($user_id, 'simple_local_avatar');
    }
}

$simple_local_avatars = new simple_local_avatars;
if (!function_exists('get_simple_local_avatar')):
/*
 * more efficient to call simple local avatar directly in theme and avoid gravatar setup
 * 
 * @param int|string|object $id_or_email A user ID, email address, or comment object
 * @param int $size Size of the avatar image
 * @param string $default URL to a default image to use if no avatar is available
 * @param string $alt Alternate text to use in image tag. Defaults to blank
 * @return string <img> tag for the user's avatar
 */
    function get_simple_local_avatar($id_or_email, $size = '96', $default = '', $alt = false) {
        global $simple_local_avatars;
        return $simple_local_avatars->get_avatar('', $id_or_email, $size, $default, $alt);
    }
endif;

// on uninstallation, remove the custom field from the users and delete the local avatars
register_uninstall_hook(__FILE__, 'simple_local_avatars_uninstall');

function simple_local_avatars_uninstall() {
    $simple_local_avatars = new simple_local_avatars;
    $users = get_users_of_blog();
    foreach ($users as $user)
        $simple_local_avatars->avatar_delete($user->user_id);
    delete_option('simple_local_avatars_caps');
}

Si desea una solución súper liviana y no le importa introducir un pequeño código, colóquelo en su functions.php;

function __default_local_avatar()
{
    // this assumes default_avatar.png is in wp-content/themes/active-theme/images
    return get_bloginfo('template_directory') . '/images/default_avatar.png';
}
add_filter( 'pre_option_avatar_default', '__default_local_avatar' );

Alternativamente, si desea un poco más de jugo, con la capacidad de administrar todo en el administrador, consulte Agregar nuevo avatar predeterminado .

ACTUALIZACIÓN: escribí un complemento rápido para usar junto con los avatares locales simples.

<?php

/**
 * Plugin Name: Disable Default Avatars
 * Plugin URI: http://wordpress.stackexchange.com/questions/17413
 * Description: To be used alongside <a href="http://www.get10up.com/plugins/simple-local-avatars-wordpress/">Simple Local Avatars</a>, disabling all default avatars and falling back to a single image. Use the filter <code>local_default_avatar</code> to set the path of the image.
 * Version: 1.0
 * Author: TheDeadMedic
 * Author URI: http://wordpress.stackexchange.com/users/1685/thedeadmedic
 */

if ( !function_exists( 'get_avatar' ) ) :
/**
 * Retrieve the avatar for a user who provided a user ID or email address.
 *
 * @since 2.5
 * @param int|string|object $id_or_email A user ID,  email address, or comment object
 * @param int $size Size of the avatar image
 * @param string $default URL to a default image to use if no avatar is available
 * @param string $alt Alternate text to use in image tag. Defaults to blank
 * @return string <img> tag for the user's avatar
*/
function get_avatar( $id_or_email, $size = '96', $default = '', $alt = false ) {
    if ( ! get_option('show_avatars') )
        return false;

    static $default_url; // use static vars for a little caching
    if ( !isset( $default_url ) )
        $default_url = apply_filters( 'local_default_avatar', get_template_directory_uri() . '/images/default_avatar.png' );

    if ( false === $alt)
        $safe_alt = '';
    else
        $safe_alt = esc_attr( $alt );

    if ( !is_numeric( $size ) )
        $size = '96';

    $avatar = "<img alt='{$safe_alt}' src='{$default_url}' class='avatar avatar-{$size} photo avatar-default' height='{$size}' width='{$size}' />";
    return apply_filters( 'get_avatar', $avatar, $id_or_email, $size, $default, $alt );
}
endif;

function __limit_default_avatars_setting( $default )
{
    return 'local_default';
}
add_filter( 'pre_option_avatar_default', '__limit_default_avatars_setting' );

if ( is_admin() ) :
function __limit_default_avatars( $defaults )
{
    return array( 'local_default' => get_bloginfo( 'name' ) . ' Default' );
}
add_filter( 'avatar_defaults', '__limit_default_avatars' );
endif;

?>

La descripción del complemento debe explicarse por sí misma, pero esencialmente el avatar predeterminado es http://wordpress-theme-path/images/default_avatar.png, que se puede filtrar en el functions.php de su tema si existe en otro lugar;

function __my_theme_default_avatar( $url )
{
    return 'http://somewhere/else.jpg';
}
add_filter( 'local_default_avatar', '__my_theme_default_avatar' );

Reemplacé con éxito todos los avatares de gravitar.com con mi propia imagen de avatar alojada localmente agregando esto al function.phparchivo de mi tema :

define('DEFAULT_AVATAR_URL', get_template_directory_uri() . '/images/user.png');

function no_gravatars( $avatar ) {
    return preg_replace( "/http.*?gravatar\.com[^\']*/", DEFAULT_AVATAR_URL, $avatar );
}
add_filter( 'get_avatar', 'no_gravatars' );

Esto supone que tiene un avatar local predeterminado llamado user.pngen el imagessubdirectorio de su tema .

En el discussion settingspanel de administración, asegúrese de que "Mostrar avatares" esté marcado.

No he probado esto con Avatares locales simples, pero funciona muy bien con Avatares de usuarios básicos (que es una bifurcación ligera de Avatares locales simples).

SUGERENCIA : si está diseñando su propio avatar predeterminado, le recomiendo que tenga 300x300 píxeles para que se vea bien en las pantallas "retina" cuando WP lo muestre en "150x150". Entonces puede reducir significativamente el tamaño de archivo de la imagen comprimiéndola en tinyPNG.com .

Eliminar avatares por completo. Ponga este código en functions.php de su tema en uso.

add_action( 'init', 'qmas_remove_avatars' );
if (!function_exists('qmas_remove_avatars')) {
    function qmas_remove_avatars() {
        add_filter( 'bp_core_fetch_avatar', function () { return ''; } );
        add_filter( 'get_avatar', function () { return ''; } );
        add_filter( 'bp_get_signup_avatar', function () { return ''; } );
    }
}