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Edit: /home/melaqxso/public_html/wp-content/themes/hub/liquid/admin/updater/liquid-updater-class.php

<?php
/**
 * Liquid Themes Theme Framework
 * The Liquid_Updater initiate the theme engine
 */

if( !defined( 'ABSPATH' ) ) 
	exit; // Exit if accessed directly
	
class Liquid_Updater {
	
	private $remote_api_url;
	private $request_data;
	private $response_key;
	private $theme_slug;
	private $purchase_code;
	private $version;
	private $author;
	protected $strings = null;

function __construct( $args = array(), $strings = array() ) {

$args = wp_parse_args( $args, array(
			'remote_api_url' => 'http://api.liquid-themes.com/hub',
			'request_data' => array(),
			'theme_slug' => get_template(),
			'item_name' => '',
			'license' => '',
			'version' => '',
			'author' => ''
		) );
		extract( $args );

$this->license = $license;
		$this->item_name = $item_name;
		$this->version = $version;
		$this->theme_slug = sanitize_key( $theme_slug );
		$this->remote_api_url = $remote_api_url;
		$this->response_key = $this->theme_slug . '-update-response';
		$this->strings = $strings;

add_filter( 'site_transient_update_themes', array( &$this, 'theme_update_transient' ) );
		add_filter( 'delete_site_transient_update_themes', array( &$this, 'delete_theme_update_transient' ) );
		add_action( 'load-update-core.php', array( &$this, 'delete_theme_update_transient' ) );
		add_action( 'load-themes.php', array( &$this, 'delete_theme_update_transient' ) );
		add_action( 'load-themes.php', array( &$this, 'load_themes_screen' ) );

add_action( 'admin_head', array( &$this, 'update_notice' ) );
		add_action( 'wp_ajax_lqd_update_notice_response', function() {
			set_transient( 'lqd_update_notice_response', [], 2 * WEEK_IN_SECONDS );
			wp_send_json_success('LIQUID - Update popup will appear after 2 weeks!');
		} );

}

function load_themes_screen() {
		add_thickbox();
		add_action( 'admin_notices', array( &$this, 'update_nag' ) );
	}

function update_nag() {

$strings = $this->strings;

$theme = wp_get_theme( $this->theme_slug );

$api_response = get_transient( $this->response_key );

if ( false === $api_response ) {
			return;
		}

$update_url = wp_nonce_url( 'update.php?action=upgrade-theme&amp;theme=' . urlencode( $this->theme_slug ), 'upgrade-theme_' . $this->theme_slug );
		$update_onclick = ' onclick="if ( confirm(\'' . esc_js( 'Updating this theme will lose any customizations you have made. \'Cancel\' to stop, \'OK\' to update.' ) . '\') ) {return true;}return false;"';

if ( version_compare( $this->version, $api_response->new_version, '<' ) ) {

echo '<div id="update-nag">';
			printf(
				wp_kses_post( __( '<strong>%1$s %2$s</strong> is available. <a href="%3$s" class="thickbox" title="%4s">Check out what\'s new</a> or <a href="%5$s"%6$s>update now</a>.', 'hub' ) ),
				$theme->get( 'Name' ),
				$api_response->new_version,
				'#TB_inline?width=640&amp;inlineId=' . $this->theme_slug . '_changelog',
				$theme->get( 'Name' ),
				$update_url,
				$update_onclick
			);
			echo '</div>';
			echo '<div id="' . $this->theme_slug . '_' . 'changelog" style="display:none;">';
			echo wpautop( $api_response->sections['changelog'] );
			echo '</div>';
		}
	}

function theme_update_transient( $value ) {
		$update_data = $this->check_for_update();
		if ( $update_data ) {

if ( ! is_object( $value ) ) {
				$value = new stdClass;
			}

$update_data['theme'] = $this->theme_slug;

if ( version_compare( $this->version, $update_data['new_version'], '<' ) ) {
				$value->response[ $this->theme_slug ] = $update_data;
			} else {
				$value->no_update[ $this->theme_slug ] = $update_data;
			}
		}

return $value;
	}

function delete_theme_update_transient() {
		delete_transient( $this->response_key );
	}

function check_for_update() {

$update_data = get_transient( $this->response_key );

if ( false === $update_data ) {
			$failed = false;

$api_params = array(
				'action'  => 'get_version',
				'license' => $this->license,
				'slug' 	  => $this->theme_slug,
				'author' => $this->author
			);

$response = wp_remote_get( $this->remote_api_url, array( 'timeout' => 15, 'body' => $api_params ) );

// Make sure the response was successful
			if ( is_wp_error( $response ) || 200 != wp_remote_retrieve_response_code( $response ) ) {
				$failed = true;
			}

$update_data = json_decode( wp_remote_retrieve_body( $response ) );

if ( ! is_object( $update_data ) ) {
				$failed = true;
			}

// If the response failed, try again in 30 minutes
			if ( $failed ) {
				$data = new stdClass;
				$data->new_version = $this->version;
				set_transient( $this->response_key, $data, strtotime( '+30 minutes' ) );
				return false;
			}

// If the status is 'ok', return the update arguments
			if ( ! $failed ) {
				$update_data->sections = maybe_unserialize( $update_data->sections );
				set_transient( $this->response_key, $update_data, strtotime( '+12 hours' ) );
			}
		}

if ( version_compare( $this->version, $update_data->new_version, '>=' ) ) {
			return false;
		}

return (array) $update_data;
	}

function update_notice() {

global $pagenow;

// check themes page
		if ( $pagenow === 'themes.php' ) {
			return;
		}

// limit request
		if ( get_transient( 'lqd_update_notice_response_cache' ) === 'cached' ) {
			return;
		}

$check = get_transient( 'lqd_update_notice_response' );

if ( false === $check ) {
			$failed = false;

$api_params = array(
				'action'  => 'get_version',
				'license' => $this->license,
				'slug' 	  => $this->theme_slug,
				'author' => $this->author
			);

$response = wp_remote_get( $this->remote_api_url, array( 'timeout' => 15, 'body' => $api_params ) );

// Make sure the response was successful
			if ( is_wp_error( $response ) || 200 != wp_remote_retrieve_response_code( $response ) ) {
				$failed = true;
			}

if ( !$failed ) {

$update_data = json_decode( wp_remote_retrieve_body( $response ) );
				set_transient( 'lqd_update_notice_response_cache', 'cached', 30 * MINUTE_IN_SECONDS );

if ( version_compare( $this->version, $update_data->stable_version, '<' ) ) {

$title = sprintf( 
						'<span class="dashicons dashicons-update-alt"></span> %s', 
						__( 'Theme update available!', 'hub' )
					);

$content = sprintf(
						'<p>Hub v%s %s</p><p>%s</p>',
						$update_data->stable_version,
						__( 'is available!', 'hub' ),
						$update_data->features,
					);

$redirect_url = admin_url( 'themes.php' );

wp_add_inline_script( 'liquid-admin', "
						jQuery( document ).ready(function() {
							jQuery.confirm({
								columnClass: 'lqd-update',
								type: 'orange',
								title: '$title',
								content: '$content',
								buttons: {
									new: {
										text: 'Later',
										action: function() {
											jQuery.post(ajaxurl, { 'action': 'lqd_update_notice_response' }, function (response) {
												console.log(response.data);
											});
										}
									},
									confirm: {
										text: 'Update now',
										action: function() {
											window.location.href = '$redirect_url';
										}
									},
								}
							});
						});
					" );

}

}
	
}

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