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

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

if( !defined( 'ABSPATH' ) ) 
	exit; // Exit if accessed directly

class Liquid_Register {

/**
	 * Variables required for the theme updater
	 *
	 * @since 1.0.0
	 * @type string
	 */
	 protected $remote_api_url = null;
	 protected $theme_slug = null;
	 protected $version = null;
	 protected $renew_url = null;
	 protected $strings = null;

/**
	 * Initialize the class.
	 *
	 * @since 1.0.0
	 */
	function __construct( $config = array(), $strings = array() ) {

$config = wp_parse_args( $config, array(
			'remote_api_url' => 'http://api.liquid-themes.com/hub',
			'theme_slug'     => 'hub',
			'version'        => '',
			'author'         => 'Liquid Themes',
			'renew_url'      => ''
		) );

// Set config arguments
		$this->remote_api_url = $config['remote_api_url'];
		$this->theme_slug     = sanitize_key( $config['theme_slug'] );
		$this->version        = $config['version'];
		$this->author         = $config['author'];
		$this->renew_url      = $config['renew_url'];

// Populate version fallback
		if ( '' == $config['version'] ) {
			$theme = wp_get_theme( $this->theme_slug );
			$this->version = $theme->get( 'Version' );
		}

// Strings passed in from the updater config
		$this->strings = $strings;

add_action( 'after_setup_theme', array( $this, 'init_hooks' ) );
		add_action( 'admin_init', array( $this, 'updater' ) );
		add_action( 'admin_init', array( $this, 'register_option' ) );
		add_filter( 'http_request_args', array( $this, 'disable_wporg_request' ), 5, 2 );

}

/**
	 * Creates the updater class.
	 *
	 * since 1.0.0
	 */
	function updater() {

/* If there is no valid license key status, don't allow updates. */
		if ( get_option( $this->theme_slug . '_purchase_code_status', false ) != 'valid' ) {
			return;
		}

if ( !class_exists( 'Liquid_Updater' ) ) {
			// Load our custom theme updater
			include( get_template_directory() . '/liquid/admin/updater/liquid-updater-class.php' );
		}

new Liquid_Updater(
			array(
				'remote_api_url' => $this->remote_api_url,
				'version' 		 => $this->version,
				'purchase_code'  => trim( get_option( $this->theme_slug . '_purchase_code' ) ),
			),
			$this->strings
		);
	}
	
	/**
	 * [init_hooks description]
	 * @method init_hooks
	 * @return [type]     [description]
	 */
	public function init_hooks() {

if ( 'valid' != get_option( $this->theme_slug . '_purchase_code_status', false ) ) {

if ( ( ! isset( $_GET['page'] ) || 'liquid' != $_GET['page'] ) ) {
                add_action( 'admin_notices', array( $this, 'admin_error' ) );
            } else {
                add_action( 'admin_notices', array( $this, 'admin_notice' ) );

}
        }
	}
	
	function admin_error() {
		echo '<div class="error"><p>' . sprintf( wp_kses_post( __( 'The %s theme needs to be registered. %sRegister Now%s', 'hub' ) ), 'Hub', '<a href="' . admin_url( 'admin.php?page=liquid') . '">' , '</a>' ) . '</p></div>';
	}
	
	function admin_notice() {
		echo '<div class="notice"><p>' .
                         sprintf( wp_kses_post( __( 'Purchase code is invalid. Need a license? %sPurchase Now%s', 'hub' ) ), '<a target="_blank" href="https://themeforest.net/item/hub-responsive-multipurpose-wordpress-theme/31569152">', '</a>' ) .
            '</p></div>';
	}
	
	function messages() {

$license = trim( get_option( $this->theme_slug . '_purchase_code' ) );
		$status = get_option( $this->theme_slug . '_purchase_code_status', false );

// Checks license status to display under license key
		if ( ! $license ) {
			$message    = '<div class="lqd-dsd-box-head-inner">
								<h4>' . esc_html__( 'Register Hub', 'hub' ) . '</h4>
							</div>';
		} 
		else {
			
			// delete_transient( $this->theme_slug . '_license_message' );
			if ( ! get_transient( $this->theme_slug . '_license_message', false ) ) {
				set_transient( $this->theme_slug . '_license_message', $this->check_license(), ( 60 * 60 * 24 ) );
			}
			$message = get_transient( $this->theme_slug . '_license_message' );
		}
		
		echo wp_kses_post( $message );
		
	}
	
	/**
	 * Outputs the markup used on the theme license page.
	 *
	 * since 1.0.0
	 */
	function form() {

$strings = $this->strings;

$license = trim( get_option( $this->theme_slug . '_purchase_code' ) );
		$email = get_option( $this->theme_slug . '_register_email', false );
		$status = get_option( $this->theme_slug . '_purchase_code_status', false );

?>
		<form action="options.php" method="post" class="lqd-dsd-register-form">
			<?php settings_fields( $this->theme_slug . '-license' ); ?>
			<input id="hub_purchase_code" name="hub_purchase_code" type="text" value="<?php echo esc_attr( $license ); ?>" placeholder="<?php esc_attr_e( 'Enter your purchase code', 'hub' ); ?>">
			<input id="hub_register_email" name="hub_register_email" type="email" value="<?php echo esc_attr( $email ); ?>" placeholder="<?php esc_attr_e( 'Enter your email', 'hub' ); ?>">
			<input type="submit" value="<?php esc_attr_e( 'Register your copy', 'hub' ) ?>">
		</form>
		<?php
	}
	
	/**
	 * Registers the option used to store the license key in the options table.
	 *
	 * since 1.0.0
	 */
	function register_option() {
		register_setting(
			$this->theme_slug . '-license',
			$this->theme_slug . '_purchase_code',
			array( $this, 'sanitize_license' )
		);
		register_setting(
			$this->theme_slug . '-license',
			$this->theme_slug . '_register_email'
		);
	}

/**
	 * Sanitizes the license key.
	 *
	 * since 1.0.0
	 *
	 * @param string $new License key that was submitted.
	 * @return string $new Sanitized license key.
	 */
	function sanitize_license( $new ) {

$old = get_option( 'hub_purchase_code' );

if ( $old && $old != $new ) {
			// New license has been entered, so must reactivate
			delete_option( $this->theme_slug . '_purchase_code_status' );
			delete_transient( $this->theme_slug . '_license_message' );
		}

return $new;
	}
	
	/**
	 * Makes a call to the API.
	 *
	 * @since 1.0.0
	 *
	 * @param array $api_params to be used for wp_remote_get.
	 * @return array $response decoded JSON response.
	 */
	 function get_api_response( $api_params ) {

// Call the custom API.
		$response = wp_remote_get(
			add_query_arg( $api_params, $this->remote_api_url ),
			array( 'timeout' => 15, 'sslverify' => false )
		);

// Make sure the response came back okay.
		if ( is_wp_error( $response ) ) {
			return false;
		}

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

return $response;
	 }
	 
	/**
	 * Checks if license is valid and gets expire date.
	 *
	 * @since 1.0.0
	 *
	 * @return string $message License status message.
	 */
	function check_license() {

$license = trim( get_option( $this->theme_slug . '_purchase_code' ) );
		$email = get_option( $this->theme_slug . '_register_email', false );
		$strings = $this->strings;

$api_params = array(
			'liquid_action' => 'check_license',
			'license'       => $license,
			'email'         => $email,
			'from'          => get_site_url(),
		);

$license_data = $this->get_api_response( $api_params );

if ( is_object( $license_data ) && $license_data->license == 'valid' ) {

update_option( $this->theme_slug . '_purchase_code_status', $license_data->license );
			$message = '<div class="lqd-dsd-confirmation success">
							<h4>Thanks for the verification!</h4>
							<p>You can now enjoy Hub and build great websites. Looking for help? Visit <a href="https://docs.liquid-themes.com/" target="_blank">our help center</a> or <a href="https://liquidthemes.freshdesk.com/support/home" target="_blank">submit a ticket</a>.</p>
						</div>';
		}
		else {
			$message = '<div class="lqd-dsd-confirmation fail">
							<h4>Purchase code is invalid.</h4>
							<p>Please check your purchase code and re-enter. Looking for help? Visit <a href="https://docs.liquid-themes.com/" target="_blank">our help center</a> or <a href="https://liquidthemes.freshdesk.com/support/home" target="_blank">submit a ticket</a>.</p>
						</div>';
		}

return $message;
	}

/**
	 * Disable requests to wp.org repository for this theme.
	 *
	 * @since 1.0.0
	 */
	function disable_wporg_request( $r, $url ) {

// If it's not a theme update request, bail.
		if ( 0 !== strpos( $url, 'https://api.wordpress.org/themes/update-check/1.1/' ) ) {
 			return $r;
 		}

// Decode the JSON response
 		$themes = json_decode( $r['body']['themes'] );

// Remove the active parent and child themes from the check
 		$parent = get_option( 'template' );
 		$child = get_option( 'stylesheet' );
 		unset( $themes->themes->$parent );
 		unset( $themes->themes->$child );

// Encode the updated JSON response
 		$r['body']['themes'] = json_encode( $themes );

return $r;
	}
	
}

new Liquid_Register;

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