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<?php
/*
Plugin Name: Custom Avatar URLs
Plugin URI: http://wordpress.stackexchange.com/q/67312/6035
Description: Custom urls for author avatars.
Author: Christopher Davis
Author URI: http://christopherdavis.me
License: GPL2
Copyright 2012 Christopher Davis
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2, as
published by the Free Software Foundation.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
WPSE67312_Avatars::init();
class WPSE67312_Avatars
{
// we'll need a nonce key
const NONCE = 'wpse67312_nonce';
// The meta key where the avatar URL is stored.
const META_KEY = 'wpse67312_avatar';
/***** Singleton pattern to add hooks and such *****/
private static $ins = null;
public static function init()
{
add_action('plugins_loaded', array(__CLASS__, 'instance'));
}
public static function instance()
{
is_null(self::$ins) && self::$ins = new self;
return self::$ins;
}
/**
* Helper to fetch avatar urls.
*
* @param int $user_id The user ID for which to fetch the avatar
* @uses get_user_meta To fetch the avatar URL.
* @return string The avatar url
*/
public static function get_avatar($user_id)
{
return get_user_meta($user_id, self::META_KEY, true);
}
/**
* Constructor. Where all the real actions get added.
*
* @uses add_action
* @uses add_filter
* @return void
*/
protected function __construct()
{
add_action('edit_user_profile', array($this, 'field'));
add_action('show_user_profile', array($this, 'field'));
add_action('edit_user_profile_update', array($this, 'save'));
add_action('personal_options_update', array($this, 'save'));
add_filter('get_avatar', array($this, 'filter_avatar'), 10, 5);
}
public function field($user)
{
// Might want to hide this from authors?
// if(!current_user_can('manage_options'))
// return;
wp_nonce_field(self::NONCE . $user->ID, self::NONCE, false);
echo '<h4>', esc_html__('Avatar URL', 'wpse'), '</h4>';
printf(
'<input type="text" class="regular-text" id="%1$s" name="%1$s" value="%2$s" />',
esc_attr(self::META_KEY),
esc_attr(self::get_avatar($user->ID))
);
}
public function save($user_id)
{
if(
!isset($_POST[self::NONCE]) ||
!wp_verify_nonce($_POST[self::NONCE], self::NONCE . $user_id)
) return; // nonce is no good, bail
if(!current_user_can('edit_user', $user_id))
return; // current user can't edit this user, bail
if(!empty($_POST[self::META_KEY]))
{
// we have data! save it!
update_user_meta(
$user_id,
self::META_KEY,
esc_url_raw($_POST[self::META_KEY])
);
}
else
{
// empty field, delete the old value
delete_user_meta($user_id, self::META_KEY);
}
}
public function filter_avatar($avatar, $id_or_email, $size, $default, $alt)
{
// do the dance to get a user
$id = false;
if(is_numeric($id_or_email))
{
$id = $id_or_email;
}
elseif(is_object($id_or_email))
{
if(!empty($id_or_email->user_id))
$id = $id_or_email->user_id; // comment
}
elseif($user = get_user_by('email', $id_or_email))
{
$id = $user->ID;
}
if($id && ($avt = self::get_avatar($id)))
{
$avatar = sprintf(
'<img src="%1$s" alt="%2$s" title="%2$s" width="%3$s" />',
esc_url($avt),
esc_attr($alt),
esc_attr($size)
);
}
return $avatar;
}
}