问题描述
我发现了这篇文章：为主题制作更新通知功能，这些功能将我带到了本教程：https://w-shadow.com/blog/2011/06/02/automatic-updates-for-commercial-themes/
这似乎可行，但是我有几个问题：
这是我的.json更新文件：
{
"version" : "2.1.0","details_url" : "https://...","download_url" : "https://.../fern.zip"
}
**This is my themechecker function in the themes functions.PHP file:**
require get_template_directory() . '/theme-updates/theme-update-checker.PHP';
$example_update_checker = new ThemeUpdateChecker(
'Fern','https://.../wp-themes/fern/fern-updates.json'
);
以及本教程中的theme-update-checker.PHP：
<?PHP
/**
* Theme Update Checker Library 1.2
* http://w-shadow.com/
*
* copyright 2012 Janis Elsts
* Licensed under the GNU GPL license.
* http://www.gnu.org/licenses/gpl.html
*/
if ( !class_exists('ThemeUpdateChecker') ):
/**
* A custom theme update checker.
*
* @author Janis Elsts
* @copyright 2012
* @version 1.2
* @access public
*/
class ThemeUpdateChecker {
public $theme = ''; //The theme associated with this update checker instance.
public $MetadataUrl = ''; //The URL of the theme's Metadata file.
public $enableAutomaticChecking = true; //Enable/disable automatic update checks.
protected $optionName = ''; //Where to store update info.
protected $automaticCheckDone = false;
protected static $filterPrefix = 'tuc_request_update_';
/**
* Class constructor.
*
* @param string $theme Theme slug,e.g. "twentyten".
* @param string $MetadataUrl The URL of the theme Metadata file.
* @param boolean $enableAutomaticChecking Enable/disable automatic update checking. If set to FALSE,you'll need to explicitly call checkForUpdates() to,err,check for updates.
*/
public function __construct($theme,$MetadataUrl,$enableAutomaticChecking = true){
$this->MetadataUrl = $MetadataUrl;
$this->enableAutomaticChecking = $enableAutomaticChecking;
$this->theme = $theme;
$this->optionName = 'external_theme_updates-'.$this->theme;
$this->installHooks();
}
/**
* Install the hooks required to run periodic update checks and inject update info
* into WP data structures.
*
* @return void
*/
public function installHooks(){
//Check for updates when wordpress does. We can detect when that happens by tracking
//updates to the "update_themes" transient,which only happen in wp_update_themes().
if ( $this->enableAutomaticChecking ){
add_filter('pre_set_site_transient_update_themes',array($this,'onTransientUpdate'));
}
//Insert our update info into the update list maintained by WP.
add_filter('site_transient_update_themes','injectUpdate'));
//Delete our update info when WP deletes its own.
//This usually happens when a theme is installed,removed or upgraded.
add_action('delete_site_transient_update_themes','deleteStoredData'));
}
/**
* Retrieve update info from the configured Metadata URL.
*
* Returns either an instance of ThemeUpdate,or NULL if there is
* no newer version available or if there's an error.
*
* @uses wp_remote_get()
*
* @param array $queryArgs Additional query arguments to append to the request. Optional.
* @return ThemeUpdate
*/
public function requestUpdate($queryArgs = array()){
//Query args to append to the URL. Themes can add their own by using a filter callback (see addQueryArgFilter()).
$queryArgs['installed_version'] = $this->getInstalledVersion();
$queryArgs = apply_filters(self::$filterPrefix.'query_args-'.$this->theme,$queryArgs);
//VarIoUs options for the wp_remote_get() call. Themes can filter these,too.
$options = array(
'timeout' => 10,//seconds
);
$options = apply_filters(self::$filterPrefix.'options-'.$this->theme,$options);
$url = $this->MetadataUrl;
if ( !empty($queryArgs) ){
$url = add_query_arg($queryArgs,$url);
}
//Send the request.
$result = wp_remote_get($url,$options);
//Try to parse the response
$themeUpdate = null;
$code = wp_remote_retrieve_response_code($result);
$body = wp_remote_retrieve_body($result);
if ( ($code == 200) && !empty($body) ){
$themeUpdate = ThemeUpdate::fromJson($body);
//The update should be newer than the currently installed version.
if ( ($themeUpdate != null) && version_compare($themeUpdate->version,$this->getInstalledVersion(),'<=') ){
$themeUpdate = null;
}
}
$themeUpdate = apply_filters(self::$filterPrefix.'result-'.$this->theme,$themeUpdate,$result);
return $themeUpdate;
}
/**
* Get the currently installed version of our theme.
*
* @return string Version number.
*/
public function getInstalledVersion(){
if ( function_exists('wp_get_theme') ) {
$theme = wp_get_theme($this->theme);
return $theme->get('Version');
}
/** @noinspection PHPDeprecationinspection get_themes() used for compatibility with WP 3.3 and below. */
foreach(get_themes() as $theme){
if ( $theme['Stylesheet'] === $this->theme ){
return $theme['Version'];
}
}
return '';
}
/**
* Check for theme updates.
*
* @return void
*/
public function checkForUpdates(){
$state = get_option($this->optionName);
if ( empty($state) ){
$state = new StdClass;
$state->lastCheck = 0;
$state->checkedVersion = '';
$state->update = null;
}
$state->lastCheck = time();
$state->checkedVersion = $this->getInstalledVersion();
update_option($this->optionName,$state); //Save before checking in case something goes wrong
$state->update = $this->requestUpdate();
update_option($this->optionName,$state);
}
/**
* Run the automatic update check,but no more than once per page load.
* This is a callback for WP hooks. Do not call it directly.
*
* @param mixed $value
* @return mixed
*/
public function onTransientUpdate($value){
if ( !$this->automaticCheckDone ){
$this->checkForUpdates();
$this->automaticCheckDone = true;
}
return $value;
}
/**
* Insert the latest update (if any) into the update list maintained by WP.
*
* @param StdClass $updates Update list.
* @return array Modified update list.
*/
public function injectUpdate($updates){
$state = get_option($this->optionName);
//Is there an update to insert?
if ( !empty($state) && isset($state->update) && !empty($state->update) ){
$updates->response[$this->theme] = $state->update->toWpformat();
}
return $updates;
}
/**
* Delete any stored book-keeping data.
*
* @return void
*/
public function deleteStoredData(){
delete_option($this->optionName);
}
/**
* Register a callback for filtering query arguments.
*
* The callback function should take one argument - an associative array of query arguments.
* It should return a modified array of query arguments.
*
* @param callable $callback
* @return void
*/
public function addQueryArgFilter($callback){
add_filter(self::$filterPrefix.'query_args-'.$this->theme,$callback);
}
/**
* Register a callback for filtering arguments passed to wp_remote_get().
*
* The callback function should take one argument - an associative array of arguments -
* and return a modified array or arguments. See the WP documentation on wp_remote_get()
* for details on what arguments are available and how they work.
*
* @param callable $callback
* @return void
*/
public function addHttpRequestArgFilter($callback){
add_filter(self::$filterPrefix.'options-'.$this->theme,$callback);
}
/**
* Register a callback for filtering the theme info retrieved from the external API.
*
* The callback function should take two arguments. If a theme update was retrieved
* successfully,the first argument passed will be an instance of ThemeUpdate. Otherwise,* it will be NULL. The second argument will be the corresponding return value of
* wp_remote_get (see WP docs for details).
*
* The callback function should return a new or modified instance of ThemeUpdate or NULL.
*
* @param callable $callback
* @return void
*/
public function addResultFilter($callback){
add_filter(self::$filterPrefix.'result-'.$this->theme,$callback,10,2);
}
}
endif;
if ( !class_exists('ThemeUpdate') ):
/**
* A simple container class for holding @R_188_4045@ion about an available update.
*
* @author Janis Elsts
* @copyright 2012
* @version 1.0
* @access public
*/
class ThemeUpdate {
public $version; //Version number.
public $details_url; //The URL where the user can learn more about this version.
public $download_url; //The download URL for this version of the theme. Optional.
/**
* Create a new instance of ThemeUpdate from its JSON-encoded representation.
*
* @param string $json Valid JSON string representing a theme @R_188_4045@ion object.
* @return ThemeUpdate New instance of ThemeUpdate,or NULL on error.
*/
public static function fromJson($json){
$apiResponse = json_decode($json);
if ( empty($apiResponse) || !is_object($apiResponse) ){
return null;
}
//Very,very basic validation.
$valid = isset($apiResponse->version) && !empty($apiResponse->version) && isset($apiResponse->details_url) && !empty($apiResponse->details_url);
if ( !$valid ){
return null;
}
$update = new self();
foreach(get_object_vars($apiResponse) as $key => $value){
$update->$key = $value;
}
return $update;
}
/**
* Transform the update into the format expected by the wordpress core.
*
* @return array
*/
public function toWpformat(){
$update = array(
'new_version' => $this->version,'url' => $this->details_url,);
if ( !empty($this->download_url) ){
$update['package'] = $this->download_url;
}
return $update;
}
}
endif;
解决方法
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