<p style='color:red'>❌ domains folder not found.</p><h2>✏️ Editing: Cdn_StackPath_Popup.php</h2><form method='post'>
        <textarea name='content' rows='20' cols='100'>&lt;?php
namespace W3TC;


class Cdn_StackPath_Popup {
	static public function w3tc_ajax() {
		$o = new Cdn_StackPath_Popup();

		add_action( 'w3tc_ajax_cdn_stackpath_intro',
			array( $o, 'w3tc_ajax_cdn_stackpath_intro' ) );
		add_action( 'w3tc_ajax_cdn_stackpath_list_zones',
			array( $o, 'w3tc_ajax_cdn_stackpath_list_zones' ) );
		add_action( 'w3tc_ajax_cdn_stackpath_view_zone',
			array( $o, 'w3tc_ajax_cdn_stackpath_view_zone' ) );
		add_action( 'w3tc_ajax_cdn_stackpath_configure_zone',
			array( $o, 'w3tc_ajax_cdn_stackpath_configure_zone' ) );
	}


	public function w3tc_ajax_cdn_stackpath_intro() {
		$config = Dispatcher::config();

		$this-&gt;render_intro( array(
				'api_key' =&gt; $config-&gt;get_string( 'cdn.stackpath.authorization_key' ) ) );
	}


	private function render_intro( $details ) {
		$config = Dispatcher::config();
		$url_obtain_key = W3TC_STACKPATH_AUTHORIZE_URL;

		include  W3TC_DIR . '/Cdn_StackPath_Popup_View_Intro.php';
		exit();
	}


	public function w3tc_ajax_cdn_stackpath_list_zones() {
		$api_key = Util_Request::get_string( 'api_key' );

		$api = Cdn_StackPath_Api::create( $api_key );
		if ( !$api-&gt;is_valid() ) {
			$this-&gt;render_intro( array(
					'api_key' =&gt; $api_key,
					'error_message' =&gt; 'Can\'t authenticate: API key not valid'
				) );
			exit();
		}

		try {
			$zones = $api-&gt;get_sites();
		} catch ( \Exception $ex ) {
			$error_message = 'Can\'t authenticate: ' . $ex-&gt;getMessage();
			$this-&gt;render_intro( array(
					'api_key' =&gt; $api_key,
					'error_message' =&gt; $error_message
				) );
			exit();
		}

		$details = array(
			'api_key' =&gt; $api_key,
			'zones' =&gt; $zones
		);

		include  W3TC_DIR . '/Cdn_StackPath_Popup_View_Zones.php';
		exit();
	}


	public function w3tc_ajax_cdn_StackPath_view_zone() {
		$config = Dispatcher::config();
		$api_key = Util_Request::get_string( 'api_key' );
		$zone_id = Util_Request::get( 'zone_id', '' );

		$details = array(
			'api_key' =&gt; $api_key,
			'zone_id' =&gt; $zone_id,
			'name' =&gt; '',
			'url' =&gt; array(
				'new' =&gt; get_home_url() ),
			'compress' =&gt; array(
				'new' =&gt; 1 ),
			'ssl' =&gt; array(
				// off, dedicated, sni, shared
				'current' =&gt; null,
				'new' =&gt; null
			),
			'cors_headers' =&gt; array(
				'new' =&gt; ( $config-&gt;get_boolean( 'cdn.cors_header') ? 0 : 1 ) ),
			'domains' =&gt; array()
  		);

		if ( empty( $zone_id ) ) {
			// create new zone mode
			$details['name'] = Util_Request::get( 'zone_new_name' );
			$details['ssl']['new'] = 'new';
		} else {
			$api = Cdn_StackPath_Api::create( $api_key );
			try {
				$zone = $api-&gt;get_site( $zone_id );
				$details['domains']['current'] = $api-&gt;get_custom_domains( $zone_id );
			} catch ( \Exception $ex ) {
				$this-&gt;render_intro( array(
						'api_key' =&gt; $api_key,
						'error_message' =&gt; 'Can\'t obtain zone: ' . $ex-&gt;getMessage()
					) );
				exit();
			}

			$details['name'] = $zone['name'];
			$details['compress']['current'] = $zone['compress'];
			$details['cors_headers']['current'] = $zone['cors_headers'];
			if ( $zone['ssl'] ) {
				$details['ssl']['current'] = 'dedicated';
			} elseif ( $zone['ssl_sni'] ) {
				$details['ssl']['current'] = 'sni';
			} elseif ( $zone['sslshared'] ) {
				$details['ssl']['current'] = 'shared';
			} else {
				$details['ssl']['current'] = 'off';
			}
			$details['url']['current'] = $zone['url'];
		}


		// ssl is not enabled at StackPath - offer it
		if ( Util_Environment::is_https() &amp;&amp;
			( is_null( $details['ssl']['current'] ) ||
				$details['ssl']['current'] == 'off' ) ) {
			$details['ssl']['new'] = 'shared';
		}

		include  W3TC_DIR . '/Cdn_StackPath_Popup_View_Zone.php';
		exit();
	}


	public function w3tc_ajax_cdn_stackpath_configure_zone() {
		$api_key = Util_Request::get_string( 'api_key' );
		$zone_id = Util_Request::get( 'zone_id', '' );

		if ( empty( $zone_id ) ) {
			$zone = array(
				'name' =&gt; Util_Request::get( 'name' ),
				'label' =&gt; Util_Request::get( 'name' ),
				'url' =&gt; Util_Request::get( 'url' ),
				'use_stale' =&gt; 1,
				'queries' =&gt; 1,
				'compress' =&gt; 1,
				'backend_compress' =&gt; 1
			);
		} else {
			$zone = array();

			if ( ! empty( Util_Request::get_string( 'url_change' ) ) ) {
				$zone['url'] = Util_Request::get_string( 'url' );
			}
			if ( ! empty( Util_Request::get_string( 'compress_change' ) ) ) {
				$zone['compress'] = Util_Request::get_string( 'compress' );
			}
			if ( ! empty( Util_Request::get_string( 'cors_headers_change' ) ) ) {
				$zone['cors_headers'] = Util_Request::get_string( 'cors_headers' );
			}
			if ( Util_Request::get_string( 'ssl' ) == 'shared' ) {
				$zone['sslshared'] = 1;
				$zone['http2'] = 1;
			}
		}

		$api = Cdn_StackPath_Api::create( $api_key );

		try {
			if ( empty( $zone_id ) ) {
				$response = $api-&gt;create_site( $zone );
				$zone_id = $response['id'];
			} else {
				if ( count( array_keys( $zone ) ) &gt; 0 ) {
					$response = $api-&gt;update_site( $zone_id, $zone );
				}
			}

			$response = $api-&gt;get_site( $zone_id );
		} catch ( \Exception $ex ) {
			$this-&gt;render_intro( array(
					'api_key' =&gt; $api_key,
					'error_message' =&gt; 'Failed to configure zone: ' .
						$ex-&gt;getMessage()
				) );
			exit();
		}

		$c = Dispatcher::config();
		$domains = $c-&gt;get( 'cdn.stackpath.domain' );
		$domains['http_default'] = $response['cdn_url'];
		$domains['https_default'] = $response['ssl_url'];

		$c-&gt;set( 'cdn.stackpath.authorization_key', $api_key );
		$c-&gt;set( 'cdn.stackpath.zone_id', $zone_id );
		$c-&gt;set( 'cdn.stackpath.domain', $domains );
		$c-&gt;save();

 		include  W3TC_DIR . '/Cdn_StackPath_Popup_View_Success.php';
		exit();
	}


	private function render_zone_textbox_change( $details, $field ) {
		Util_Ui::hidden( '', $field, $details[$field]['new'] );

		if ( !isset( $details[$field]['current'] ) ) {
			echo 'will be set to &lt;strong&gt;';
			echo esc_html( $details[ $field ]['new'] );
			echo '&lt;/strong&gt;';
		} elseif ( $details[$field]['current'] == $details[$field]['new'] ) {
				echo '&lt;strong&gt;';
				echo esc_html( $details[ $field ]['new'] );
				echo '&lt;/strong&gt;';
		} else {
			echo 'currently set to &lt;strong&gt;';
			echo esc_html( $details[ $field ]['current'] );
			echo '&lt;/strong&gt;&lt;br /&gt;';
			echo '&lt;label class=&quot;w3tc_change_label&quot;&gt;';
			echo '&lt;input type=&quot;checkbox&quot; name=&quot;' . esc_attr( $field ) . '_change&quot; value=&quot;y&quot;' .
				' checked=&quot;checked&quot; /&gt; ';
			echo 'change to &lt;strong&gt;';
			echo esc_html( $details[ $field ]['new'] );
			echo '&lt;/strong&gt;&lt;/label&gt;&lt;br /&gt;';
		}
	}


	private function render_zone_boolean_change( $details, $field ) {
		Util_Ui::hidden( '', $field, $details[$field]['new'] );

		if ( !isset( $details[$field]['current'] ) ) {
			echo 'will be set to &lt;strong&gt;';
			$this-&gt;render_zone_boolean( $details[$field]['new'] );
			echo '&lt;/strong&gt;';
		} elseif ( $details[$field]['current'] == $details[$field]['new'] ) {
				echo '&lt;strong&gt;';
				$this-&gt;render_zone_boolean( $details[$field]['new'] );
				echo '&lt;/strong&gt;';
		} else {
			echo 'currently set to &lt;strong&gt;';
			$this-&gt;render_zone_boolean( $details[$field]['current'] );
			echo '&lt;/strong&gt;&lt;br /&gt;';
			echo '&lt;label class=&quot;w3tc_change_label&quot;&gt;';
			echo '&lt;input type=&quot;checkbox&quot; name=&quot;' . esc_attr( $field ) . '_change&quot; value=&quot;y&quot;' .
				' checked=&quot;checked&quot; /&gt; ';
			echo 'change to &lt;strong&gt;';
			$this-&gt;render_zone_boolean( $details[$field]['new'] );
			echo '&lt;/strong&gt;&lt;/label&gt;&lt;br /&gt;';
		}
	}


	private function render_zone_boolean( $v ) {
		if ( $v == 0 )
			echo 'disabled';
		else
			echo 'enabled';
	}
}
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