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name : functions.php
 <?php
/*
* SITESEO
* https://siteseo.io
* (c) SITSEO Team
*/

// Are we being accessed directly ?
if(!defined('ABSPATH')) {
	exit('Hacking Attempt !');
}

// Add our license key if ANY
function siteseo_pro_updater_filter_args($queryArgs){
	
	global $siteseo;
	
	if (!empty($siteseo->license['license'])){
		$queryArgs['license'] = $siteseo->license['license'];
	}
	
	$queryArgs['url'] = rawurlencode(site_url());
	
	return $queryArgs;
}

// Handle the Check for update link and ask to install license key
function siteseo_pro_updater_check_link($final_link){
	
	global $siteseo;
	
	if(empty($siteseo->license['license'])){
		return '<a href="'.admin_url('admin.php?page=siteseo-license').'">Install SiteSEO Pro License Key</a>';
	}
	
	return $final_link;
}

// Prevent update of Siteseo free
function siteseo_pro_file_get_free_version_num(){
		
	if(defined('SITESEO_VERSION')){
		return SITESEO_VERSION;
	}
	
	// In case of Siteseo deactive
	return siteseo_pro_file_get_version_num('siteseo/siteseo.php');
}

// Prevent update of Siteseo free
function siteseo_pro_file_get_version_num($plugin){
	
	// In case of Siteseo deactive
	include_once(ABSPATH . 'wp-admin/includes/plugin.php');
	$plugin_data = get_plugin_data(WP_PLUGIN_DIR . '/'.$plugin);

	if(empty($plugin_data)){
		return false;
	}

	return $plugin_data['Version'];

}

// Prevent update of siteseo free
function siteseo_pro_disable_manual_update_for_plugin($transient){
	$plugin = 'siteseo/siteseo.php';
	
	// Is update available?
	if(!isset($transient->response) || !isset($transient->response[$plugin])){
		return $transient;
	}
	
	$free_version = siteseo_pro_file_get_free_version_num();
	$pro_version = SITESEO_PRO_VERSION;
	
	if(!empty($GLOBALS['siteseo_pro_is_upgraded'])){
		$pro_version = siteseo_pro_file_get_version_num('siteseo-pro/siteseo-pro.php');
	}

	// Update the Siteseo version to the equivalent of Pro version
	if(!empty($pro_version) && version_compare($free_version, $pro_version, '<')){
		$transient->response[$plugin]->new_version = $pro_version;
		$transient->response[$plugin]->package = 'https://a.softaculous.com/siteseo/files/versions/latest-stable-free.zip';
	}else{
		unset($transient->response[$plugin]);
	}

	return $transient;
}

// Auto update free version after update pro version
function siteseo_pro_update_free_after_pro($upgrader_object, $options){
	
	// Check if the action is an update for the plugins
	if($options['action'] != 'update' || $options['type'] != 'plugin'){
		return;
	}
		
	// Define the slugs for the free and pro plugins
	$free_slug = 'siteseo/siteseo.php'; 
	$pro_slug = 'siteseo-pro/siteseo-pro.php';

	// Check if the pro plugin is in the list of updated plugins
	if( 
		(isset($options['plugins']) && in_array($pro_slug, $options['plugins']) && !in_array($free_slug, $options['plugins'])) ||
		(isset($options['plugin']) && $pro_slug == $options['plugin'])
	){
	
		// Trigger the update for the free plugin
		$current_version = siteseo_pro_file_get_free_version_num();
		
		if(empty($current_version)){
			return;
		}
		
		$GLOBALS['siteseo_pro_is_upgraded'] = true;
		
		// This will set the 'update_plugins' transient again
		wp_update_plugins();

		// Check for updates for the free plugin
		$update_plugins = get_site_transient('update_plugins');
		
		if(empty($update_plugins) || !isset($update_plugins->response[$free_slug]) || version_compare($update_plugins->response[$free_slug]->new_version, $current_version, '<=')){
			return;
		}
		
		require_once(ABSPATH . 'wp-admin/includes/plugin.php');
		require_once(ABSPATH . 'wp-admin/includes/class-wp-upgrader.php');
		
		$skin = wp_doing_ajax()? new WP_Ajax_Upgrader_Skin() : null;
		
		$upgrader = new Plugin_Upgrader($skin);
		$upgraded = $upgrader->upgrade($free_slug);
		
		if(!is_wp_error($upgraded) && $upgraded){
			// Re-active free plugins
			if( file_exists( WP_PLUGIN_DIR . '/'.  $free_slug ) && is_plugin_inactive($free_slug) ){
				activate_plugin($free_slug); // TODO for network
			}
			
			// Re-active pro plugins
			if( file_exists( WP_PLUGIN_DIR . '/'.  $pro_slug ) && is_plugin_inactive($pro_slug) ){
				activate_plugin($pro_slug); // TODO for network
			}
		}
	}
}

// Load license data
function siteseo_pro_load_license($parent = 0){
	
	global $siteseo;
	
	if(!empty($parent)){
		$license_field = 'softaculous_pro_license';
		$license_api_url = 'https://a.softaculous.com/softwp/';
	}else{
		$license_field = 'siteseo_license';
		$license_api_url = SITESEO_API;
	}
	
	// Load license
	$siteseo->license = get_option($license_field, []);
	
	// Update license details as well
	if(!empty($siteseo->license) && !empty($siteseo->license['license']) && (time() - @$siteseo->license['last_update']) >= 86400){
		
		$resp = wp_remote_get($license_api_url.'license.php?license='.$siteseo->license['license'].'&url='.rawurlencode(site_url()));
		
		// Did we get a response ?
		if(is_array($resp)){
			
			$tosave = json_decode($resp['body'], true);
			
			// Is it the license ?
			if(!empty($tosave['license'])){
				$tosave['last_update'] = time();
				update_option($license_field, $tosave);
			}
		}	
	}

	// If the license is Free or Expired check for Softaculous Pro license
	if(empty($siteseo->license) || empty($siteseo->license['active'])){
		
		if(function_exists('softaculous_pro_load_license')){
			$softaculous_license = softaculous_pro_load_license();
			if(!empty($softaculous_license['license']) && 
				(!empty($softaculous_license['active']) || empty($siteseo->license['license']))
			){
				$siteseo->license = $softaculous_license;
			}
		}elseif(empty($parent)){
			$siteseo->license = get_option('softaculous_pro_license', []);
			
			if(!empty($siteseo->license)){
				siteseo_pro_load_license(1);
			}
		}
	}
	
}

function siteseo_pro_api_url($main_server = 0, $suffix = 'siteseo'){
	global $siteseo;
	
	$r = array(
		'https://s0.softaculous.com/a/softwp/',
		'https://s1.softaculous.com/a/softwp/',
		'https://s2.softaculous.com/a/softwp/',
		'https://s3.softaculous.com/a/softwp/',
		'https://s4.softaculous.com/a/softwp/',
		'https://s5.softaculous.com/a/softwp/',
		'https://s7.softaculous.com/a/softwp/',
		'https://s8.softaculous.com/a/softwp/'
	);

	$mirror = $r[array_rand($r)];

	// If the license is newly issued, we need to fetch from API only
	if(!empty($main_server) || empty($siteseo->license['last_edit']) || 
		(!empty($siteseo->license['last_edit']) && (time() - 3600) < $siteseo->license['last_edit'])
	){
		$mirror = SITESEO_API;
	}

	if(!empty($suffix)){
		$mirror = str_replace('/softwp', '/'.$suffix, $mirror);
	}

	return $mirror;
	
}
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