Self-Hosted Plugin Updates

{
	"version" => "1.1",
	"download_url" : "https://rudrastyh.com/misha-plugin.zip",
	"requires" : "3.0",
	"tested" : "4.8.1",
	"requires_php" : "5.3",
	"last_updated" : "2017-08-17 02:10:00",
	"sections" : {
		"description" : "This is the plugin to test your updater script",
		"installation" : "Upload the plugin to your blog, Activate it, that's it!",
		"changelog" : "<h4>1.1 –  January 17, 2020</h4><ul><li>Some bugs are fixed.</li><li>Release date.</li></ul>"
	},
	"banners" : {
		"low" : "https://YOUR_WEBSITE/banner-772x250.jpg",
		"high" : "https://YOUR_WEBSITE/banner-1544x500.jpg"
	},
	"screenshots" : "<ol><li><a href='IMG_URL' target='_blank'><img src='IMG_URL' alt='CAPTION' /></a><p>CAPTION</p></li></ol>"
}

add_filter('plugins_api', 'misha_plugin_info', 20, 3);
/*
 * $res empty at this step
 * $action 'plugin_information'
 * $args stdClass Object ( [slug] => woocommerce [is_ssl] => [fields] => Array ( [banners] => 1 [reviews] => 1 [downloaded] => [active_installs] => 1 ) [per_page] => 24 [locale] => en_US )
 */
function misha_plugin_info( $res, $action, $args ){
 
	// do nothing if this is not about getting plugin information
	if( 'plugin_information' !== $action ) {
		return false;
	}
 
	$plugin_slug = 'YOUR PLUGIN SLUG'; // we are going to use it in many places in this function
 
	// do nothing if it is not our plugin
	if( $plugin_slug !== $args->slug ) {
		return false;
	}
 
	// trying to get from cache first
	if( false == $remote = get_transient( 'misha_update_' . $plugin_slug ) ) {
 
		// info.json is the file with the actual plugin information on your server
		$remote = wp_remote_get( 'https://rudrastyh.com/wp-content/uploads/info.json', array(
			'timeout' => 10,
			'headers' => array(
				'Accept' => 'application/json'
			) )
		);
 
		if ( ! is_wp_error( $remote ) && isset( $remote['response']['code'] ) && $remote['response']['code'] == 200 && ! empty( $remote['body'] ) ) {
			set_transient( 'misha_update_' . $plugin_slug, $remote, 43200 ); // 12 hours cache
		}
 
	}
 
	if( ! is_wp_error( $remote ) && isset( $remote['response']['code'] ) && $remote['response']['code'] == 200 && ! empty( $remote['body'] ) ) {
 
		$remote = json_decode( $remote['body'] );
		$res = new stdClass();
 
		$res->name = $remote->name;
		$res->slug = $plugin_slug;
		$res->version = $remote->version;
		$res->tested = $remote->tested;
		$res->requires = $remote->requires;
		$res->author = '<a href="https://rudrastyh.com">Misha Rudrastyh</a>';
		$res->author_profile = 'https://profiles.wordpress.org/rudrastyh';
		$res->download_link = $remote->download_url;
		$res->trunk = $remote->download_url;
		$res->requires_php = '5.3';
		$res->last_updated = $remote->last_updated;
		$res->sections = array(
			'description' => $remote->sections->description,
			'installation' => $remote->sections->installation,
			'changelog' => $remote->sections->changelog
			// you can add your custom sections (tabs) here
		);
 
		// in case you want the screenshots tab, use the following HTML format for its content:
		// <ol><li><a href="IMG_URL" target="_blank"><img src="IMG_URL" alt="CAPTION" /></a><p>CAPTION</p></li></ol>
		if( !empty( $remote->sections->screenshots ) ) {
			$res->sections['screenshots'] = $remote->sections->screenshots;
		}
 
		$res->banners = array(
			'low' => 'https://YOUR_WEBSITE/banner-772x250.jpg',
			'high' => 'https://YOUR_WEBSITE/banner-1544x500.jpg'
		);
		return $res;
 
	}
 
	return false;
 
}

add_filter('site_transient_update_plugins', 'misha_push_update' );
 
function misha_push_update( $transient ){
 
	if ( empty($transient->checked ) ) {
            return $transient;
        }
 
	// trying to get from cache first, to disable cache comment 10,20,21,22,24
	if( false == $remote = get_transient( 'misha_upgrade_YOUR_PLUGIN_SLUG' ) ) {
 
		// info.json is the file with the actual plugin information on your server
		$remote = wp_remote_get( 'https://YOUR_WEBSITE/SOME_PATH/info.json', array(
			'timeout' => 10,
			'headers' => array(
				'Accept' => 'application/json'
			) )
		);
 
		if ( !is_wp_error( $remote ) && isset( $remote['response']['code'] ) && $remote['response']['code'] == 200 && !empty( $remote['body'] ) ) {
			set_transient( 'misha_upgrade_YOUR_PLUGIN_SLUG', $remote, 43200 ); // 12 hours cache
		}
 
	}
 
	if( $remote ) {
 
		$remote = json_decode( $remote['body'] );
 
		// your installed plugin version should be on the line below! You can obtain it dynamically of course 
		if( $remote && version_compare( '1.0', $remote->version, '<' ) && version_compare($remote->requires, get_bloginfo('version'), '<' ) ) {
			$res = new stdClass();
			$res->slug = 'YOUR_PLUGIN_SLUG';
			$res->plugin = 'YOUR_PLUGIN_FOLDER/YOUR_PLUGIN_SLUG.php'; // it could be just YOUR_PLUGIN_SLUG.php if your plugin doesn't have its own directory
			$res->new_version = $remote->version;
			$res->tested = $remote->tested;
			$res->package = $remote->download_url;
           		$transient->response[$res->plugin] = $res;
           		//$transient->checked[$res->plugin] = $remote->version;
           	}
 
	}
        return $transient;
}