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Current File : /home/uneseuleoc/crid/web/app/plugins/ewww-image-optimizer/classes/class-exactdn.php
<?php
/**
 * Class and methods to implement ExactDN (based on Photon implementation).
 *
 * @link https://ewww.io
 * @package EIO
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

if ( ! class_exists( 'ExactDN' ) ) {
	/**
	 * Enables plugin to filter the page content and replace image urls with ExactDN urls.
	 */
	class ExactDN extends EIO_Page_Parser {

		/**
		 * A list of user-defined exclusions, populated by validate_user_exclusions().
		 *
		 * @access protected
		 * @var array $user_exclusions
		 */
		protected $user_exclusions = array();

		/**
		 * A list of image sizes registered for attachments.
		 *
		 * @access protected
		 * @var array $image_sizes
		 */
		protected static $image_sizes = null;

		/**
		 * Indicates if we are in full-page filtering mode.
		 *
		 * @access public
		 * @var bool $filtering_the_page
		 */
		public $filtering_the_page = false;

		/**
		 * Indicates if we are in content filtering mode.
		 *
		 * @access public
		 * @var bool $filtering_the_content
		 */
		public $filtering_the_content = false;

		/**
		 * List of permitted domains for ExactDN rewriting.
		 *
		 * @access public
		 * @var array $allowed_domains
		 */
		public $allowed_domains = array();

		/**
		 * Path portion to remove at beginning of URL, usually for path-style S3 domains.
		 *
		 * @access public
		 * @var string $remove_path
		 */
		public $remove_path = '';

		/**
		 * The ExactDN domain/zone.
		 *
		 * @access private
		 * @var float $elapsed_time
		 */
		private $exactdn_domain = false;

		/**
		 * The detected site scheme (http/https).
		 *
		 * @access private
		 * @var string $scheme
		 */
		private $scheme = false;

		/**
		 * Allow us to track how much overhead ExactDN introduces.
		 *
		 * @access private
		 * @var float $elapsed_time
		 */
		private $elapsed_time = 0;

		/**
		 * Keep track of the attribute we use for srcset, in case a lazy load plugin is active.
		 *
		 * @access private
		 * @var string $srcset_attr
		 */
		private $srcset_attr = 'srcset';

		/**
		 * Register (once) actions and filters for ExactDN. If you want to use this class, use the global.
		 */
		function __construct() {
			parent::__construct( __FILE__ );
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			global $exactdn;
			if ( is_object( $exactdn ) ) {
				return 'you are doing it wrong';
			}

			// Make sure we have an ExactDN domain to use.
			if ( ! $this->setup() ) {
				return;
			}

			if ( ! $this->scheme ) {
				$site_url = get_home_url();
				$scheme   = 'http';
				if ( strpos( $site_url, 'https://' ) !== false ) {
					$scheme = 'https';
				}
				$this->scheme = $scheme;
			}

			// Images in post content and galleries.
			add_filter( 'the_content', array( $this, 'filter_the_content' ), 999999 );
			// Start an output buffer before any output starts.
			add_filter( $this->prefix . 'filter_page_output', array( $this, 'filter_page_output' ), 5 );

			// Core image retrieval.
			if ( ! function_exists( 'aq_resize' ) ) {
				add_filter( 'image_downsize', array( $this, 'filter_image_downsize' ), 10, 3 );
			} else {
				$this->debug_message( 'aq_resize detected, image_downsize filter disabled' );
			}
			// Disable image_downsize filter during themify_get_image().
			add_action( 'themify_before_post_image', array( $this, 'disable_image_downsize' ) );
			if ( defined( 'EXACTDN_IMAGE_DOWNSIZE_SCALE' ) && EXACTDN_IMAGE_DOWNSIZE_SCALE ) {
				add_action( 'exactdn_image_downsize_array', array( $this, 'image_downsize_scale' ) );
			}

			// Check REST API requests to see if ExactDN should be running.
			add_filter( 'rest_request_before_callbacks', array( $this, 'parse_restapi_maybe' ), 10, 3 );

			// Overrides for admin-ajax images.
			add_filter( 'exactdn_admin_allow_image_downsize', array( $this, 'allow_admin_image_downsize' ), 10, 2 );
			// Overrides for "pass through" images.
			add_filter( 'exactdn_pre_args', array( $this, 'exactdn_remove_args' ), 10, 3 );
			// Overrides for user exclusions.
			add_filter( 'exactdn_skip_image', array( $this, 'exactdn_skip_user_exclusions' ), 9, 2 );
			add_filter( 'exactdn_skip_for_url', array( $this, 'exactdn_skip_user_exclusions' ), 9, 2 );

			// Responsive image srcset substitution.
			add_filter( 'wp_calculate_image_srcset', array( $this, 'filter_srcset_array' ), 1001, 5 );
			add_filter( 'wp_calculate_image_sizes', array( $this, 'filter_sizes' ), 1, 2 ); // Early so themes can still filter.

			// Filter for NextGEN image urls within JS.
			add_filter( 'ngg_pro_lightbox_images_queue', array( $this, 'ngg_pro_lightbox_images_queue' ) );
			add_filter( 'ngg_get_image_url', array( $this, 'ngg_get_image_url' ) );

			// Filter for legacy WooCommerce API endpoints.
			add_filter( 'woocommerce_api_product_response', array( $this, 'woocommerce_api_product_response' ) );

			// DNS prefetching.
			add_filter( 'wp_resource_hints', array( $this, 'dns_prefetch' ), 10, 2 );

			// Get all the script/css urls and rewrite them (if enabled).
			if ( $this->get_option( 'exactdn_all_the_things' ) ) {
				add_filter( 'style_loader_src', array( $this, 'parse_enqueue' ), 20 );
				add_filter( 'script_loader_src', array( $this, 'parse_enqueue' ), 20 );
			}

			// Improve the default content_width for Twenty Nineteen.
			global $content_width;
			if ( function_exists( 'twentynineteen_setup' ) && 640 === (int) $content_width ) {
				$content_width = 932;
			}

			// Configure Autoptimize with our CDN domain.
			add_filter( 'autoptimize_filter_cssjs_multidomain', array( $this, 'autoptimize_cdn_url' ) );

			// Find the "local" domain.
			$s3_active = false;
			if ( class_exists( 'Amazon_S3_And_CloudFront' ) ) {
				global $as3cf;
				$s3_region = $as3cf->get_setting( 'region' );
				$s3_bucket = $as3cf->get_setting( 'bucket' );
				if ( is_wp_error( $s3_region ) ) {
					$s3_region = '';
				}
				$s3_domain = $as3cf->get_provider()->get_url_domain( $s3_bucket, $s3_region, null, array(), true );
				$this->debug_message( "found S3 domain of $s3_domain with bucket $s3_bucket and region $s3_region" );
				if ( ! empty( $s3_domain ) && $as3cf->get_setting( 'serve-from-s3' ) ) {
					$s3_active = true;
				}
			}

			if ( $s3_active ) {
				$upload_dir = array(
					'baseurl' => 'https://' . $s3_domain,
				);
			} else {
				$upload_dir = wp_upload_dir( null, false );
			}
			$upload_url_parts = defined( 'EXACTDN_LOCAL_DOMAIN' ) && EXACTDN_LOCAL_DOMAIN ? $this->parse_url( EXACTDN_LOCAL_DOMAIN ) : $this->parse_url( $upload_dir['baseurl'] );
			if ( empty( $upload_url_parts ) ) {
				return;
			}
			$this->upload_domain = $upload_url_parts['host'];
			$this->debug_message( "allowing images from here: $this->upload_domain" );
			if (
				( false !== strpos( $this->upload_domain, 'amazonaws.com' ) || false !== strpos( $this->upload_domain, 'storage.googleapis.com' ) ) &&
				! empty( $upload_url_parts['path'] )
			) {
				$this->remove_path = rtrim( $upload_url_parts['path'], '/' );
				$this->debug_message( "removing this from urls: $this->remove_path" );
			}
			$this->allowed_domains[] = $this->upload_domain;
			if ( ! $s3_active && strpos( $this->upload_domain, 'www' ) === false ) {
				$this->allowed_domains[] = 'www.' . $this->upload_domain;
			} else {
				$nonwww = ltrim( 'www.', $this->upload_domain );
				if ( $nonwww !== $this->upload_domain ) {
					$this->allowed_domains[] = $nonwww;
				}
			}
			$wpml_domains = apply_filters( 'wpml_setting', array(), 'language_domains' );
			if ( $this->is_iterable( $wpml_domains ) ) {
				$this->debug_message( 'wpml domains: ' . implode( ',', $wpml_domains ) );
				$this->allowed_domains[] = $this->parse_url( get_option( 'home' ), PHP_URL_HOST );
				foreach ( $wpml_domains as $wpml_domain ) {
					$this->allowed_domains[] = $wpml_domain;
				}
			}
			$this->allowed_domains = apply_filters( 'exactdn_allowed_domains', $this->allowed_domains );
			$this->debug_message( 'allowed domains: ' . implode( ',', $this->allowed_domains ) );
			$this->validate_user_exclusions();
		}

		/**
		 * If ExactDN is enabled, validates and configures the ExactDN domain name.
		 */
		function setup() {
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			// If we don't have a domain yet, go grab one.
			if ( ! $this->get_exactdn_domain() ) {
				$this->debug_message( 'attempting to activate exactDN' );
				$exactdn_domain = $this->activate_site();
			} else {
				$this->debug_message( 'grabbing existing exactDN domain' );
				$exactdn_domain = $this->get_exactdn_domain();
			}
			if ( ! $exactdn_domain ) {
				delete_option( $this->prefix . 'exactdn' );
				delete_site_option( $this->prefix . 'exactdn' );
				return false;
			}
			// If we have a domain, verify it.
			if ( $this->verify_domain( $exactdn_domain ) ) {
				$this->debug_message( 'verified existing exactDN domain' );
				$this->exactdn_domain = $exactdn_domain;
				$this->debug_message( 'exactdn_domain: ' . $exactdn_domain );
				return true;
			}
			delete_option( $this->prefix . 'exactdn_domain' );
			delete_option( $this->prefix . 'exactdn_verified' );
			delete_site_option( $this->prefix . 'exactdn_domain' );
			delete_site_option( $this->prefix . 'exactdn_verified' );
			return false;
		}

		/**
		 * Use the Site URL to get the zone domain.
		 */
		function activate_site() {
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			$s3_active = false;
			if ( class_exists( 'Amazon_S3_And_CloudFront' ) ) {
				global $as3cf;
				$s3_scheme = $as3cf->get_url_scheme();
				$s3_region = $as3cf->get_setting( 'region' );
				$s3_bucket = $as3cf->get_setting( 'bucket' );
				if ( is_wp_error( $s3_region ) ) {
					$s3_region = '';
				}
				$s3_domain = $as3cf->get_provider()->get_url_domain( $s3_bucket, $s3_region, null, array(), true );
				$this->debug_message( "found S3 domain of $s3_domain with bucket $s3_bucket and region $s3_region" );
				if ( ! empty( $s3_domain ) && $as3cf->get_setting( 'serve-from-s3' ) ) {
					$s3_active = true;
				}
			}

			if ( $s3_active ) {
				$site_url = defined( 'EXACTDN_LOCAL_DOMAIN' ) && EXACTDN_LOCAL_DOMAIN ? EXACTDN_LOCAL_DOMAIN : $s3_scheme . '://' . $s3_domain;
			} else {
				$site_url = defined( 'EXACTDN_LOCAL_DOMAIN' ) && EXACTDN_LOCAL_DOMAIN ? EXACTDN_LOCAL_DOMAIN : get_home_url();
			}
			$url = 'http://optimize.exactlywww.com/exactdn/activate.php';
			$ssl = wp_http_supports( array( 'ssl' ) );
			if ( $ssl ) {
				$url = set_url_scheme( $url, 'https' );
			}
			add_filter( 'http_headers_useragent', $this->prefix . 'cloud_useragent', PHP_INT_MAX );
			$result = wp_remote_post(
				$url,
				array(
					'timeout' => 10,
					'body'    => array(
						'site_url' => $site_url,
					),
				)
			);
			if ( is_wp_error( $result ) ) {
				$error_message = $result->get_error_message();
				$this->debug_message( "exactdn activation request failed: $error_message" );
				global $exactdn_activate_error;
				$exactdn_activate_error = $error_message;
				add_action( 'admin_notices', $this->prefix . 'notice_exactdn_activation_error' );
				return false;
			} elseif ( ! empty( $result['body'] ) && strpos( $result['body'], 'domain' ) !== false ) {
				$response = json_decode( $result['body'], true );
				if ( ! empty( $response['domain'] ) ) {
					if (
						false !== strpos( $site_url, 'amazonaws.com' ) ||
						false !== strpos( $site_url, 'digitaloceanspaces.com' ) ||
						false !== strpos( $site_url, 'storage.googleapis.com' )
					) {
						$this->set_exactdn_option( 'verify_method', -1, false );
					}
					if ( get_option( 'exactdn_never_been_active' ) ) {
						$this->set_option( $this->prefix . 'lazy_load', true );
						delete_option( 'exactdn_never_been_active' );
					}
					if ( 'external' === get_option( 'elementor_css_print_method' ) ) {
						update_option( 'elementor_css_print_method', 'internal' );
					}
					if ( function_exists( 'et_get_option' ) && function_exists( 'et_update_option' ) && 'on' === et_get_option( 'et_pb_static_css_file', 'on' ) ) {
						et_update_option( 'et_pb_static_css_file', 'off' );
						et_update_option( 'et_pb_css_in_footer', 'off' );
					}
					return $this->set_exactdn_domain( $response['domain'] );
				}
			} elseif ( ! empty( $result['body'] ) && strpos( $result['body'], 'error' ) !== false ) {
				$response      = json_decode( $result['body'], true );
				$error_message = $response['error'];
				$this->debug_message( "exactdn activation request failed: $error_message" );
				global $exactdn_activate_error;
				$exactdn_activate_error = $error_message;
				add_action( 'admin_notices', $this->prefix . 'notice_exactdn_activation_error' );
				return false;
			}
			return false;
		}

		/**
		 * Verify the ExactDN domain.
		 *
		 * @param string $domain The ExactDN domain to verify.
		 * @return bool Whether the domain is still valid.
		 */
		function verify_domain( $domain ) {
			if ( empty( $domain ) ) {
				return false;
			}
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			// Check the time, to see how long it has been since we verified the domain.
			$last_checkin = $this->get_exactdn_option( 'checkin' );
			if ( $this->get_exactdn_option( 'verified' ) ) {
				return true;
			}

			$this->check_verify_method();

			// Set a default error.
			global $exactdn_activate_error;
			$exactdn_activate_error = 'zone not verified';
			if ( ! defined( 'EXACTDN_LOCAL_DOMAIN' ) && $this->get_exactdn_option( 'verify_method' ) > 0 ) {
				// Test with an image file that should be available on the ExactDN zone.
				$test_url     = plugins_url( '/images/test.png', constant( strtoupper( $this->prefix ) . 'PLUGIN_FILE' ) );
				$local_domain = $this->parse_url( $test_url, PHP_URL_HOST );
				$test_url     = str_replace( $local_domain, $domain, $test_url );
				$this->debug_message( "test url is $test_url" );
				add_filter( 'http_headers_useragent', $this->prefix . 'cloud_useragent', PHP_INT_MAX );
				$test_result = wp_remote_get( $test_url );
				if ( is_wp_error( $test_result ) ) {
					$error_message = $test_result->get_error_message();
					$this->debug_message( "exactdn verification request failed: $error_message" );
					$exactdn_activate_error = $error_message;
					add_action( 'admin_notices', $this->prefix . 'notice_exactdn_activation_error' );
					return false;
				} elseif ( ! empty( $test_result['body'] ) && strlen( $test_result['body'] ) > 300 ) {
					if ( 200 === (int) $test_result['response']['code'] &&
						( '89504e470d0a1a0a' === bin2hex( substr( $test_result['body'], 0, 8 ) ) || '52494646' === bin2hex( substr( $test_result['body'], 0, 4 ) ) ) ) {
						$this->debug_message( 'exactdn (real-world) verification succeeded' );
						$this->set_exactdn_option( 'verified', 1, false );
						add_action( 'admin_notices', $this->prefix . 'notice_exactdn_activation_success' );
						return true;
					}
					$this->debug_message( 'mime check failed: ' . bin2hex( substr( $test_result['body'], 0, 3 ) ) );
					$exactdn_activate_error = 'zone setup pending';
				}
				if ( ! empty( $test_result['response']['code'] ) && 200 !== (int) $test_result['response']['code'] ) {
					$this->debug_message( 'received response code: ' . $test_result['response']['code'] );
				}
				add_action( 'admin_notices', $this->prefix . 'notice_exactdn_activation_error' );
				return false;
			}

			// Secondary test against the API db.
			$url = 'http://optimize.exactlywww.com/exactdn/verify.php';
			$ssl = wp_http_supports( array( 'ssl' ) );
			if ( $ssl ) {
				$url = set_url_scheme( $url, 'https' );
			}
			add_filter( 'http_headers_useragent', $this->prefix . 'cloud_useragent', PHP_INT_MAX );
			$result = wp_remote_post(
				$url,
				array(
					'timeout' => 10,
					'body'    => array(
						'alias' => $domain,
					),
				)
			);
			if ( is_wp_error( $result ) ) {
				$error_message = $result->get_error_message();
				$this->debug_message( "exactdn verification request failed: $error_message" );
				$exactdn_activate_error = $error_message;
				add_action( 'admin_notices', $this->prefix . 'notice_exactdn_activation_error' );
				return false;
			} elseif ( ! empty( $result['body'] ) && strpos( $result['body'], 'error' ) === false ) {
				$response = json_decode( $result['body'], true );
				if ( ! empty( $response['success'] ) ) {
					$this->debug_message( 'exactdn (secondary) verification succeeded' );
					$this->set_exactdn_option( 'verified', 1, false );
					add_action( 'admin_notices', $this->prefix . 'notice_exactdn_activation_success' );
					return true;
				}
			} elseif ( ! empty( $result['body'] ) ) {
				$response      = json_decode( $result['body'], true );
				$error_message = $response['error'];
				$this->debug_message( "exactdn verification request failed: $error_message" );
				$exactdn_activate_error = $error_message;
				add_action( 'admin_notices', $this->prefix . 'notice_exactdn_activation_error' );
				return false;
			}
			add_action( 'admin_notices', $this->prefix . 'notice_exactdn_activation_error' );
			return false;
		}

		/**
		 * Run a simulation to decide which verification method to use.
		 */
		function check_verify_method() {
			if ( ! $this->get_exactdn_option( 'verify_method' ) ) {
				$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
				// Prelim test with a known valid image to ensure http(s) connectivity.
				$sim_url = 'https://optimize.exactdn.com/exactdn/testorig.jpg';
				add_filter( 'http_headers_useragent', $this->prefix . 'cloud_useragent', PHP_INT_MAX );
				$sim_result = wp_remote_get( $sim_url );
				if ( is_wp_error( $sim_result ) ) {
					$error_message = $sim_result->get_error_message();
					$this->debug_message( "exactdn (simulated) verification request failed: $error_message" );
				} elseif ( ! empty( $sim_result['body'] ) && strlen( $sim_result['body'] ) > 300 ) {
					if ( 'ffd8ff' === bin2hex( substr( $sim_result['body'], 0, 3 ) ) ) {
						$this->debug_message( 'exactdn (simulated) verification succeeded' );
						$this->set_exactdn_option( 'verify_method', 1, false );
						return;
					}
				}
				$this->debug_message( 'exactdn (simulated) verification request failed, error unknown' );
				$this->set_exactdn_option( 'verify_method', -1, false );
			}
		}

		/**
		 * Validate the ExactDN domain.
		 *
		 * @param string $domain The unverified ExactDN domain.
		 * @return string The validated ExactDN domain.
		 */
		function sanitize_domain( $domain ) {
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			if ( ! $domain ) {
				return;
			}
			if ( strlen( $domain ) > 80 ) {
				$this->debug_message( "$domain too long" );
				return false;
			}
			if ( ! preg_match( '#^[A-Za-z0-9\.\-]+$#', $domain ) ) {
				$this->debug_message( "$domain has bad characters" );
				return false;
			}
			return $domain;
		}

		/**
		 * Get the ExactDN domain name to use.
		 *
		 * @return string The ExactDN domain name for this site or network.
		 */
		function get_exactdn_domain() {
			if ( defined( 'EXACTDN_DOMAIN' ) && EXACTDN_DOMAIN ) {
				return $this->sanitize_domain( EXACTDN_DOMAIN );
			}
			if ( is_multisite() ) {
				if ( ! SUBDOMAIN_INSTALL ) {
					return $this->sanitize_domain( get_site_option( $this->prefix . 'exactdn_domain' ) );
				}
			}
			return $this->sanitize_domain( get_option( $this->prefix . 'exactdn_domain' ) );
		}

		/**
		 * Method to override the ExactDN domain at runtime, use with caution.
		 *
		 * @param string $domain The ExactDN domain to use instead.
		 */
		function set_domain( $domain ) {
			if ( is_string( $domain ) ) {
				$this->exactdn_domain = $domain;
			}
		}
		/**
		 * Get the ExactDN option.
		 *
		 * @param string $option_name The name of the ExactDN option.
		 * @return int The numerical value of the option.
		 */
		function get_exactdn_option( $option_name ) {
			if ( defined( 'EXACTDN_DOMAIN' ) && EXACTDN_DOMAIN ) {
				return (int) get_option( $this->prefix . 'exactdn_' . $option_name );
			}
			if ( is_multisite() ) {
				if ( ! SUBDOMAIN_INSTALL ) {
					return (int) get_site_option( $this->prefix . 'exactdn_' . $option_name );
				}
			}
			return (int) get_option( $this->prefix . 'exactdn_' . $option_name );
		}

		/**
		 * Set the ExactDN domain name to use.
		 *
		 * @param string $domain The ExactDN domain name for this site or network.
		 */
		function set_exactdn_domain( $domain ) {
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			if ( defined( 'EXACTDN_DOMAIN' ) && $this->sanitize_domain( EXACTDN_DOMAIN ) ) {
				return true;
			}
			$domain = $this->sanitize_domain( $domain );
			if ( ! $domain ) {
				return false;
			}
			if ( is_multisite() ) {
				if ( ! SUBDOMAIN_INSTALL ) {
					update_site_option( $this->prefix . 'exactdn_domain', $domain );
					return $domain;
				}
			}
			update_option( $this->prefix . 'exactdn_domain', $domain );
			return $domain;
		}

		/**
		 * Set an option for ExactDN.
		 *
		 * @param string $option_name The name of the ExactDN option.
		 * @param int    $option_value The value to set for the ExactDN option.
		 * @param bool   $autoload Optional. Whether to load the option when WordPress starts up.
		 */
		function set_exactdn_option( $option_name, $option_value, $autoload = null ) {
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			if ( defined( 'EXACTDN_DOMAIN' ) && EXACTDN_DOMAIN ) {
				return update_option( $this->prefix . 'exactdn_' . $option_name, $option_value, $autoload );
			}
			if ( is_multisite() ) {
				if ( ! SUBDOMAIN_INSTALL ) {
					return update_site_option( $this->prefix . 'exactdn_' . $option_name, $option_value );
				}
			}
			return update_option( $this->prefix . 'exactdn_' . $option_name, $option_value, $autoload );
		}

		/**
		 * Validate the user-defined exclusions for "all the things" rewriting.
		 */
		function validate_user_exclusions() {
			if ( defined( 'EXACTDN_EXCLUDE' ) && EXACTDN_EXCLUDE ) {
				$user_exclusions = EXACTDN_EXCLUDE;
			}
			if ( ! empty( $user_exclusions ) ) {
				if ( is_string( $user_exclusions ) ) {
					$user_exclusions = array( $user_exclusions );
				}
				if ( is_array( $user_exclusions ) ) {
					foreach ( $user_exclusions as $exclusion ) {
						if ( false !== strpos( $exclusion, 'wp-content' ) ) {
							$exclusion = preg_replace( '#([^"\'?>]+?)?wp-content/#i', '', $exclusion );
						}
						$this->user_exclusions[] = ltrim( $exclusion, '/' );
					}
				}
			}
			$this->user_exclusions[] = 'plugins/anti-captcha/';
		}

		/**
		 * Get $content_width, with a filter.
		 *
		 * @return bool|string The content width, if set. Default false.
		 */
		function get_content_width() {
			$content_width = isset( $GLOBALS['content_width'] ) && is_numeric( $GLOBALS['content_width'] ) && $GLOBALS['content_width'] > 100 ? $GLOBALS['content_width'] : 1920;
			if ( function_exists( 'twentynineteen_setup' ) && 640 === (int) $content_width ) {
				$content_width = 932;
			}
			/**
			 * Filter the Content Width value.
			 *
			 * @param string $content_width Content Width value.
			 */
			return (int) apply_filters( 'exactdn_content_width', $content_width );
		}

		/**
		 * Get width within an ExactDN url.
		 *
		 * @param string $url The ExactDN url to parse.
		 * @return string The width, if found.
		 */
		public function get_exactdn_width_from_url( $url ) {
			$url_args = $this->parse_url( $url, PHP_URL_QUERY );
			if ( ! $url_args ) {
				return '';
			}
			$args = explode( '&', $url_args );
			foreach ( $args as $arg ) {
				if ( preg_match( '#w=(\d+)#', $arg, $width_match ) ) {
					return $width_match[1];
				}
				if ( preg_match( '#resize=(\d+)#', $arg, $width_match ) ) {
					return $width_match[1];
				}
				if ( preg_match( '#fit=(\d+)#', $arg, $width_match ) ) {
					return $width_match[1];
				}
			}
			return '';
		}

		/**
		 * Identify images in page content, and if images are local (uploaded to the current site), pass through ExactDN.
		 *
		 * @param string $content The page/post content.
		 * @return string The content with ExactDN image urls.
		 */
		function filter_page_output( $content ) {
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			$this->filtering_the_page = true;

			$content = $this->filter_the_content( $content );

			/**
			 * Allow parsing the full page content after ExactDN is finished with it.
			 *
			 * @param string $content The fully-parsed HTML code of the page.
			 */
			$content = apply_filters( 'exactdn_the_page', $content );

			$this->filtering_the_page = false;
			$this->debug_message( "parsing page took $this->elapsed_time seconds" );
			return $content;
		}

		/**
		 * Identify images in the content, and if images are local (uploaded to the current site), pass through ExactDN.
		 *
		 * @param string $content The page/post content.
		 * @return string The content with ExactDN image urls.
		 */
		function filter_the_content( $content ) {
			$started = microtime( true );
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			$images = $this->get_images_from_html( $content, true );

			if ( ! empty( $images ) ) {
				$this->debug_message( 'we have images to parse' );
				$content_width = false;
				if ( ! $this->filtering_the_page ) {
					$this->filtering_the_content = true;
					$this->debug_message( 'filtering the content' );
					$content_width = $this->get_content_width();
				}
				$resize_existing = defined( 'EXACTDN_RESIZE_EXISTING' ) && EXACTDN_RESIZE_EXISTING;

				$image_sizes = $this->image_sizes();

				foreach ( $images[0] as $index => $tag ) {
					// Default to resize, though fit may be used in certain cases where a dimension cannot be ascertained.
					$transform = 'resize';

					// Start with a clean slate each time.
					$attachment_id = false;
					$exactdn_url   = false;
					$width         = false;
					$lazy          = false;
					$srcset_fill   = false;

					// Flag if we need to munge a fullsize URL.
					$fullsize_url = false;

					// Identify image source.
					$src      = $images['img_url'][ $index ];
					$src_orig = $images['img_url'][ $index ];
					$this->debug_message( $src );

					/**
					 * Allow specific images to be skipped by ExactDN.
					 *
					 * @param bool false Should ExactDN ignore this image. Default false.
					 * @param string $src Image URL.
					 * @param string $tag Image HTML Tag.
					 */
					if ( apply_filters( 'exactdn_skip_image', false, $src, $tag ) ) {
						continue;
					}

					$this->debug_message( 'made it passed the filters' );

					// Log 0-size Pinterest schema images.
					if ( strpos( $tag, 'data-pin-description=' ) && strpos( $tag, 'width="0" height="0"' ) ) {
						$this->debug_message( 'data-pin/Pinterest image' );
					}

					// Pre-empt srcset fill if the surrounding link has a background image or if there is a data-desktop attribute indicating a potential slider.
					if ( strpos( $tag, 'background-image:' ) || strpos( $tag, 'data-desktop=' ) ) {
						$srcset_fill = false;
					}
					/**
					 * Documented in generate_url, in this case used to detect images that should bypass srcset fill.
					 *
					 * @param array|string $args Array of ExactDN arguments.
					 * @param string $image_url Image URL.
					 * @param string|null $scheme Image scheme. Default to null.
					 */
					$args = apply_filters( 'exactdn_pre_args', array( 'test' => 'lazy-test' ), $src, null );
					if ( empty( $args ) ) {
						$srcset_fill = false;
					}
					// Support Lazy Load plugins.
					// Don't modify $tag yet as we need unmodified version later.
					$lazy_load_src = $this->get_attribute( $images['img_tag'][ $index ], 'data-lazy-src' );
					if ( $lazy_load_src ) {
						$placeholder_src      = $src;
						$placeholder_src_orig = $src;
						$src                  = $lazy_load_src;
						$src_orig             = $lazy_load_src;
						$this->srcset_attr    = 'data-lazy-srcset';
						$lazy                 = true;
						$srcset_fill          = true;
					}
					// Must be a legacy Jetpack thing as far as I can tell, no matches found in any currently installed plugins.
					$lazy_load_src = $this->get_attribute( $images['img_tag'][ $index ], 'data-lazy-original' );
					if ( ! $lazy && $lazy_load_src ) {
						$placeholder_src      = $src;
						$placeholder_src_orig = $src;
						$src                  = $lazy_load_src;
						$src_orig             = $lazy_load_src;
						$lazy                 = true;
					}
					if ( ! $lazy && strpos( $images['img_tag'][ $index ], 'a3-lazy-load/assets/images/lazy_placeholder' ) ) {
						$lazy_load_src = $this->get_attribute( $images['img_tag'][ $index ], 'data-src' );
					}
					if (
						! $lazy &&
						strpos( $images['img_tag'][ $index ], ' data-src=' ) &&
						strpos( $images['img_tag'][ $index ], 'lazyload' ) &&
						(
							strpos( $images['img_tag'][ $index ], 'data:image/gif' ) ||
							strpos( $images['img_tag'][ $index ], 'data:image/svg' )
						)
					) {
						$lazy_load_src = $this->get_attribute( $images['img_tag'][ $index ], 'data-src' );
						$this->debug_message( "found eio ll src: $lazy_load_src" );
					}
					if ( ! $lazy && $lazy_load_src ) {
						$placeholder_src      = $src;
						$placeholder_src_orig = $src;
						$src                  = $lazy_load_src;
						$src_orig             = $lazy_load_src;
						$this->srcset_attr    = 'data-srcset';
						$lazy                 = true;
						$srcset_fill          = true;
					}
					if ( ! $lazy && strpos( $images['img_tag'][ $index ], 'revslider/admin/assets/images/dummy' ) ) {
						$lazy_load_src = $this->get_attribute( $images['img_tag'][ $index ], 'data-lazyload' );
					}
					if ( ! $lazy && $lazy_load_src ) {
						$placeholder_src      = $src;
						$placeholder_src_orig = $src;
						$src                  = $lazy_load_src;
						$src_orig             = $lazy_load_src;
						$lazy                 = true;
					}

					// Check for relative urls that start with a slash. Unlikely that we'll attempt relative urls beyond that.
					if (
						'/' === substr( $src, 0, 1 ) &&
						'/' !== substr( $src, 1, 1 ) &&
						false === strpos( $this->upload_domain, 'amazonaws.com' ) &&
						false === strpos( $this->upload_domain, 'digitaloceanspaces.com' ) &&
						false === strpos( $this->upload_domain, 'storage.googleapis.com' )
					) {
						$src = '//' . $this->upload_domain . $src;
					}

					// Check if image URL should be used with ExactDN.
					if ( $this->validate_image_url( $src ) ) {
						$this->debug_message( 'url validated' );

						// Find the width and height attributes.
						$width  = $this->get_img_width( $images['img_tag'][ $index ] );
						$height = $this->get_img_height( $images['img_tag'][ $index ] );
						// Falsify them if empty.
						$width  = $width ? $width : false;
						$height = $height ? $height : false;

						// Can't pass both a relative width and height, so unset the dimensions in favor of not breaking the horizontal layout.
						if ( false !== strpos( $width, '%' ) && false !== strpos( $height, '%' ) ) {
							$width  = false;
							$height = false;
						}

						// Detect WP registered image size from HTML class.
						if ( preg_match( '#class=["|\']?[^"\']*size-([^"\'\s]+)[^"\']*["|\']?#i', $images['img_tag'][ $index ], $size ) ) {
							$size = array_pop( $size );

							$this->debug_message( "detected $size" );
							if ( false === $width && false === $height && 'full' !== $size && array_key_exists( $size, $image_sizes ) ) {
								$width     = (int) $image_sizes[ $size ]['width'];
								$height    = (int) $image_sizes[ $size ]['height'];
								$transform = $image_sizes[ $size ]['crop'] ? 'resize' : 'fit';
							}
						} else {
							unset( $size );
						}

						list( $filename_width, $filename_height ) = $this->get_dimensions_from_filename( $src );
						if ( false === $width && false === $height ) {
							$width  = $filename_width;
							$height = $filename_height;
						}
						// WP Attachment ID, if uploaded to this site.
						$attachment_id = $this->get_attribute( $images['img_tag'][ $index ], 'data-id' );
						if ( empty( $attachment_id ) ) {
							$this->debug_message( 'data-id not found, looking for wp-image-x in class' );
							preg_match( '#class=["|\']?[^"\']*wp-image-([\d]+)[^"\']*["|\']?#i', $images['img_tag'][ $index ], $attachment_id );
						}
						if ( ! $this->get_option( 'exactdn_prevent_db_queries' ) && empty( $attachment_id ) ) {
							$this->debug_message( 'looking for attachment id' );
							$attachment_id = attachment_url_to_postid( $src );
						}
						if ( ! $this->get_option( 'exactdn_prevent_db_queries' ) && ! empty( $attachment_id ) ) {
							if ( is_array( $attachment_id ) ) {
								$attachment_id = intval( array_pop( $attachment_id ) );
							}
							$this->debug_message( "using attachment id ($attachment_id) to get source image" );

							if ( $attachment_id ) {
								$this->debug_message( "detected attachment $attachment_id" );
								$attachment = get_post( $attachment_id );

								// Basic check on returned post object.
								if ( is_object( $attachment ) && ! is_wp_error( $attachment ) && 'attachment' === $attachment->post_type ) {
									$src_per_wp = wp_get_attachment_image_src( $attachment_id, 'full' );

									if ( $src_per_wp && is_array( $src_per_wp ) ) {
										$this->debug_message( "src retrieved from db: {$src_per_wp[0]}, checking for match" );
										$fullsize_url_path = $this->parse_url( $src_per_wp[0], PHP_URL_PATH );
										if ( is_null( $fullsize_url_path ) ) {
											$src_per_wp = false;
										} elseif ( $fullsize_url_path ) {
											$fullsize_url_basename = pathinfo( $fullsize_url_path, PATHINFO_FILENAME );
											$this->debug_message( "looking for $fullsize_url_basename in $src" );
											if ( strpos( wp_basename( $src ), $fullsize_url_basename ) === false ) {
												$this->debug_message( 'fullsize url does not match' );
												$src_per_wp = false;
											}
										} else {
											$src_per_wp = false;
										}
									}

									if ( $src_per_wp && $this->validate_image_url( $src_per_wp[0] ) ) {
										$this->debug_message( "detected $width filenamew $filename_width" );
										if ( $resize_existing || ( $width && (int) $filename_width !== (int) $width ) ) {
											$this->debug_message( 'resizing existing or width does not match' );
											$src = $src_per_wp[0];
										}
										$fullsize_url = true;

										// Prevent image distortion if a detected dimension exceeds the image's natural dimensions.
										if ( ( false !== $width && $width > $src_per_wp[1] ) || ( false !== $height && $height > $src_per_wp[2] ) ) {
											$width  = false === $width ? false : min( $width, $src_per_wp[1] );
											$height = false === $height ? false : min( $height, $src_per_wp[2] );
											$this->debug_message( "constrained to attachment dims, w=$width and h=$height" );
										}

										// If no width and height are found, max out at source image's natural dimensions.
										// Otherwise, respect registered image sizes' cropping setting.
										if ( false === $width && false === $height ) {
											$width     = $src_per_wp[1];
											$height    = $src_per_wp[2];
											$transform = 'fit';
											$this->debug_message( "no dims, using attachment dims, w=$width and h=$height" );
										} elseif ( isset( $size ) && array_key_exists( $size, $image_sizes ) && isset( $image_sizes[ $size ]['crop'] ) ) {
											$transform = (bool) $image_sizes[ $size ]['crop'] ? 'resize' : 'fit';
											$this->debug_message( 'attachment size set to crop' );
										}
									}
								} else {
									unset( $attachment_id );
									unset( $attachment );
								}
							}
						}
						$constrain_width = (int) $content_width;
						if ( ! empty( $images['figure_class'][ $index ] ) && false !== strpos( $images['figure_class'][ $index ], 'alignfull' ) && current_theme_supports( 'align-wide' ) ) {
							$constrain_width = (int) apply_filters( 'exactdn_full_align_image_width', max( 1920, $content_width ) );
						} elseif ( ! empty( $images['figure_class'][ $index ] ) && false !== strpos( $images['figure_class'][ $index ], 'alignwide' ) && current_theme_supports( 'align-wide' ) ) {
							$constrain_width = (int) apply_filters( 'exactdn_wide_align_image_width', max( 1500, $content_width ) );
						}
						// If width is available, constrain to $content_width.
						if ( false !== $width && false === strpos( $width, '%' ) && is_numeric( $constrain_width ) ) {
							if ( $width > $constrain_width && false !== $height && false === strpos( $height, '%' ) ) {
								$this->debug_message( 'constraining to content width' );
								$height = round( ( $constrain_width * $height ) / $width );
								$width  = $constrain_width;
							} elseif ( $width > $constrain_width ) {
								$this->debug_message( 'constraining to content width' );
								$width = $constrain_width;
							}
						}

						// Set a width if none is found and $content_width is available.
						// If width is set in this manner and height is available, use `fit` instead of `resize` to prevent skewing.
						if ( false === $width && is_numeric( $constrain_width ) ) {
							$width = (int) $constrain_width;

							if ( false !== $height ) {
								$transform = 'fit';
							}
						}

						// Detect if image source is for a custom-cropped thumbnail and prevent further URL manipulation.
						if ( ! $fullsize_url && preg_match_all( '#-e[a-z0-9]+(-\d+x\d+)?\.(' . implode( '|', $this->extensions ) . '){1}$#i', wp_basename( $src ), $filename ) ) {
							$fullsize_url = true;
						}

						// Build array of ExactDN args and expose to filter before passing to ExactDN URL function.
						$args = array();

						if ( false !== $width && false !== $height && false === strpos( $width, '%' ) && false === strpos( $height, '%' ) ) {
							$args[ $transform ] = $width . ',' . $height;
						} elseif ( false !== $width ) {
							$args['w'] = $width;
						} elseif ( false !== $height ) {
							$args['h'] = $height;
						}

						if ( ! $resize_existing && ( ! $width || (int) $filename_width === (int) $width ) ) {
							$this->debug_message( 'preventing resize' );
							$args = array();
						} elseif ( ! $fullsize_url ) {
							// Build URL, first maybe removing WP's resized string so we pass the original image to ExactDN (for higher quality).
							$src = $this->strip_image_dimensions_maybe( $src );
						}

						if ( ! $this->get_option( 'exactdn_prevent_db_queries' ) && ! empty( $attachment_id ) ) {
							$this->debug_message( 'using attachment id to check smart crop' );
							$args = $this->maybe_smart_crop( $args, $attachment_id );
						}

						/**
						 * Filter the array of ExactDN arguments added to an image.
						 * By default, only includes width and height values.
						 *
						 * @param array $args Array of ExactDN Arguments.
						 * @param array $args {
						 *     Array of image details.
						 *
						 *     @type $tag Image tag (Image HTML output).
						 *     @type $src Image URL.
						 *     @type $src_orig Original Image URL.
						 *     @type $width Image width.
						 *     @type $height Image height.
						 * }
						 */
						$args = apply_filters( 'exactdn_post_image_args', $args, compact( 'tag', 'src', 'src_orig', 'width', 'height' ) );
						$this->debug_message( "width $width" );
						$this->debug_message( "height $height" );
						$this->debug_message( "transform $transform" );

						$exactdn_url = $this->generate_url( $src, $args );
						$this->debug_message( "new url $exactdn_url" );

						// Modify image tag if ExactDN function provides a URL
						// Ensure changes are only applied to the current image by copying and modifying the matched tag, then replacing the entire tag with our modified version.
						if ( $src !== $exactdn_url ) {
							$new_tag = $tag;

							// If present, replace the link href with an ExactDN URL for the full-size image.
							if ( ! empty( $images['link_url'][ $index ] ) && $this->validate_image_url( $images['link_url'][ $index ] ) ) {
								$new_tag = preg_replace( '#(href=["|\'])' . $images['link_url'][ $index ] . '(["|\'])#i', '\1' . $this->generate_url( $images['link_url'][ $index ] ) . '\2', $new_tag, 1 );
							}

							// Insert new image src into the srcset as well, if we have a width.
							if ( false !== $width && false === strpos( $width, '%' ) && $width ) {
								$this->debug_message( 'checking to see if srcset width already exists' );
								$srcset_url      = $exactdn_url . ' ' . (int) $width . 'w, ';
								$new_srcset_attr = $this->get_attribute( $new_tag, $this->srcset_attr );
								if ( $new_srcset_attr && false === strpos( $new_srcset_attr, ' ' . (int) $width . 'w' ) && ! preg_match( '/\s(1|2|3)x/', $new_srcset_attr ) ) {
									$this->debug_message( 'src not in srcset, adding' );
									$this->set_attribute( $new_tag, $this->srcset_attr, $srcset_url . $new_srcset_attr, true );
								}
							}

							// Check if content width pushed the respimg sizes attribute too far down.
							if ( ! empty( $constrain_width ) && (int) $constrain_width !== (int) $content_width ) {
								$sizes_attr     = $this->get_attribute( $new_tag, 'sizes' );
								$new_sizes_attr = str_replace( ' ' . $content_width . 'px', ' ' . $constrain_width . 'px', $sizes_attr );
								if ( $sizes_attr !== $new_sizes_attr ) {
									$new_tag = str_replace( $sizes_attr, $new_sizes_attr, $new_tag );
								}
							}

							// Cleanup ExactDN URL.
							$exactdn_url = str_replace( '&#038;', '&', esc_url( $exactdn_url ) );
							// Supplant the original source value with our ExactDN URL.
							$this->debug_message( "replacing $src_orig with $exactdn_url" );
							$new_tag = str_replace( $src_orig, $exactdn_url, $new_tag );

							// If Lazy Load is in use, pass placeholder image through ExactDN.
							if ( isset( $placeholder_src ) && $this->validate_image_url( $placeholder_src ) ) {
								$placeholder_src = $this->generate_url( $placeholder_src );

								if ( $placeholder_src !== $placeholder_src_orig ) {
									$new_tag = str_replace( $placeholder_src_orig, str_replace( '&#038;', '&', esc_url( $placeholder_src ) ), $new_tag );
								}

								unset( $placeholder_src );
							}

							// Replace original tag with modified version.
							$content = str_replace( $tag, $new_tag, $content );
						}
					} elseif ( ! $lazy && $this->validate_image_url( $src, true ) ) {
						$this->debug_message( "found a potential exactdn src url to insert into srcset: $src" );
						// Find the width attribute.
						$width = $this->get_img_width( $images['img_tag'][ $index ] );
						if ( $width ) {
							$this->debug_message( 'found the width' );
							// Insert new image src into the srcset as well, if we have a width.
							if (
								false !== $width &&
								false === strpos( $width, '%' ) &&
								false !== strpos( $src, $width ) &&
								false !== strpos( $src, $this->exactdn_domain )
							) {
								$new_tag     = $tag;
								$exactdn_url = $src;
								$this->debug_message( 'checking to see if srcset width already exists' );
								$srcset_url      = $exactdn_url . ' ' . (int) $width . 'w, ';
								$new_srcset_attr = $this->get_attribute( $new_tag, $this->srcset_attr );
								if ( $new_srcset_attr && false === strpos( $new_srcset_attr, ' ' . (int) $width . 'w' ) && ! preg_match( '/\s(1|2|3)x/', $new_srcset_attr ) ) {
									$this->debug_message( 'src not in srcset, adding' );
									$this->set_attribute( $new_tag, $this->srcset_attr, $srcset_url . $new_srcset_attr, true );
									// Replace original tag with modified version.
									$content = str_replace( $tag, $new_tag, $content );
								}
							}
						}
					} elseif ( $lazy && ! empty( $placeholder_src ) && $this->validate_image_url( $placeholder_src ) ) {
						$new_tag = $tag;
						// If Lazy Load is in use, pass placeholder image through ExactDN.
						$placeholder_src = $this->generate_url( $placeholder_src );
						if ( $placeholder_src !== $placeholder_src_orig ) {
							$new_tag = str_replace( $placeholder_src_orig, str_replace( '&#038;', '&', esc_url( $placeholder_src ) ), $new_tag );
							// Replace original tag with modified version.
							$content = str_replace( $tag, $new_tag, $content );
						}
						unset( $placeholder_src );
					} // End if().

					// At this point, we discard the original src in favor of the ExactDN url.
					if ( ! empty( $exactdn_url ) ) {
						$src = $exactdn_url;
					}
					if ( $srcset_fill && ( ! defined( 'EXACTDN_PREVENT_SRCSET_FILL' ) || ! EXACTDN_PREVENT_SRCSET_FILL ) && false !== strpos( $src, $this->exactdn_domain ) ) {
						if ( ! $this->get_attribute( $images['img_tag'][ $index ], $this->srcset_attr ) && ! $this->get_attribute( $images['img_tag'][ $index ], 'sizes' ) ) {
							$this->debug_message( "srcset filling with $src" );
							$zoom = false;
							// If $width is empty, we'll search the url for a width param, then we try searching the img element, with fall back to the filename.
							if ( empty( $width ) || ! is_numeric( $width ) ) {
								// This only searches for w, resize, or fit flags, others are ignored.
								$width = $this->get_exactdn_width_from_url( $src );
								if ( $width ) {
									$zoom = true;
								}
							}
							if ( empty( $width ) || ! is_numeric( $width ) ) {
								$width = $this->get_img_width( $images['img_tag'][ $index ] );
							}
							list( $filename_width, $discard_height ) = $this->get_dimensions_from_filename( $src );
							if ( empty( $width ) || ! is_numeric( $width ) ) {
								$width = $filename_width;
							}
							if ( empty( $width ) || ! is_numeric( $width ) ) {
								$width = $this->get_attribute( $images['img_tag'][ $index ], 'data-actual-width' );
							}
							if ( false !== strpos( $src, 'crop=' ) || false !== strpos( $src, '&h=' ) || false !== strpos( $src, '?h=' ) ) {
								$width = false;
							}
							// Then add a srcset and sizes.
							if ( $width ) {
								$srcset = $this->generate_image_srcset( $src, $width, $zoom, $filename_width );
								if ( $srcset ) {
									$new_tag = $images['img_tag'][ $index ];
									$this->set_attribute( $new_tag, $this->srcset_attr, $srcset );
									$this->set_attribute( $new_tag, 'sizes', sprintf( '(max-width: %1$dpx) 100vw, %1$dpx', $width ) );
									// Replace original tag with modified version.
									$content = str_replace( $images['img_tag'][ $index ], $new_tag, $content );
								}
							}
						}
					}
				} // End foreach().
			} // End if();
			$content = $this->filter_bg_images( $content, 'div' );
			$content = $this->filter_bg_images( $content, 'li' );
			$content = $this->filter_bg_images( $content, 'span' );
			$content = $this->filter_bg_images( $content, 'section' );
			if ( $this->filtering_the_page ) {
				$content = $this->filter_prz_thumb( $content );
			}
			if ( $this->filtering_the_page && $this->get_option( 'exactdn_all_the_things' ) ) {
				$this->debug_message( 'rewriting all other wp-content/wp-includes urls' );
				$content = $this->filter_all_the_things( $content );
			}
			$this->debug_message( 'done parsing page' );
			$this->filtering_the_content = false;

			$elapsed_time = microtime( true ) - $started;
			$this->debug_message( "parsing the_content took $elapsed_time seconds" );
			$this->elapsed_time += microtime( true ) - $started;
			$this->debug_message( "parsing the page took $this->elapsed_time seconds so far" );
			if ( ! $this->get_option( 'exactdn_prevent_db_queries' ) && $this->elapsed_time > .5 ) {
				$this->set_option( 'exactdn_prevent_db_queries', true );
			}
			return $content;
		}

		/**
		 * Parse page content looking for elements with CSS background-image properties.
		 *
		 * @param string $content The HTML content to parse.
		 * @param string $tag_type The type of HTML tag to look for.
		 * @return string The filtered HTML content.
		 */
		function filter_bg_images( $content, $tag_type ) {
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			$content_width = false;
			if ( ! $this->filtering_the_page ) {
				$content_width = $this->get_content_width();
			}
			$this->debug_message( "content width is $content_width" );
			// Process background images on elements.
			$elements = $this->get_elements_from_html( $content, $tag_type );
			if ( $this->is_iterable( $elements ) ) {
				foreach ( $elements as $index => $element ) {
					$this->debug_message( "parsing a $tag_type" );
					if ( false === strpos( $element, 'background:' ) && false === strpos( $element, 'background-image:' ) ) {
						continue;
					}
					$style = $this->get_attribute( $element, 'style' );
					if ( empty( $style ) ) {
						continue;
					}
					$this->debug_message( "checking style attr for background-image: $style" );
					$bg_image_url = $this->get_background_image_url( $style );
					if ( $this->validate_image_url( $bg_image_url ) ) {
						/** This filter is already documented in class-exactdn.php */
						if ( apply_filters( 'exactdn_skip_image', false, $bg_image_url, $element ) ) {
							continue;
						}
						$args          = array();
						$element_class = $this->get_attribute( $element, 'class' );
						if ( false !== strpos( $element_class, 'alignfull' ) && current_theme_supports( 'align-wide' ) ) {
							$args['w'] = apply_filters( 'exactdn_full_align_bgimage_width', 1920, $bg_image_url );
						} elseif ( false !== strpos( $element_class, 'alignwide' ) && current_theme_supports( 'align-wide' ) ) {
							$args['w'] = apply_filters( 'exactdn_wide_align_bgimage_width', 1500, $bg_image_url );
						} elseif ( 'div' === $tag_type && $content_width ) {
							$args['w'] = apply_filters( 'exactdn_content_bgimage_width', $content_width, $bg_image_url );
						}
						if ( isset( $args['w'] ) && empty( $args['w'] ) ) {
							unset( $args['w'] );
						}
						$exactdn_bg_image_url = $this->generate_url( $bg_image_url, $args );
						if ( $bg_image_url !== $exactdn_bg_image_url ) {
							$new_style = str_replace( $bg_image_url, $exactdn_bg_image_url, $style );
							$element   = str_replace( $style, $new_style, $element );
						}
					}
					if ( $element !== $elements[ $index ] ) {
						$content = str_replace( $elements[ $index ], $element, $content );
					}
				}
			}
			return $content;
		}

		/**
		 * Parse page content looking for thumburl from personalization.com.
		 *
		 * @param string $content The HTML content to parse.
		 * @return string The filtered HTML content.
		 */
		function filter_prz_thumb( $content ) {
			if ( ! class_exists( 'WooCommerce' ) || false === strpos( $content, 'productDetailsForPrz' ) ) {
				return $content;
			}
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			$prz_match = preg_match( '#productDetailsForPrz=[^<]+?thumbnailUrl:\'([^\']+?)\'[^<]+?</script>#', $content, $prz_detail_matches );
			if ( $prz_match && ! empty( $prz_detail_matches[1] ) && $this->validate_image_url( $prz_detail_matches[1] ) ) {
				$prz_thumb = $this->generate_url( $prz_detail_matches[1], apply_filters( 'exactdn_personalizationdotcom_thumb_args', '', $prz_detail_matches[1] ) );
				if ( $prz_thumb !== $prz_detail_matches ) {
					$content = str_replace( "thumbnailUrl:'{$prz_detail_matches[1]}'", "thumbnailUrl:'$prz_thumb'", $content );
				}
			}
			return $content;
		}

		/**
		 * Parse page content looking for wp-content/wp-includes URLs to rewrite.
		 *
		 * @param string $content The HTML content to parse.
		 * @return string The filtered HTML content.
		 */
		function filter_all_the_things( $content ) {
			if ( $this->exactdn_domain && $this->upload_domain ) {
				$upload_domain = $this->upload_domain;
				if ( 0 === strpos( $this->upload_domain, 'www.' ) ) {
					$upload_domain = substr( $this->upload_domain, 4 );
				}
				$escaped_upload_domain = str_replace( '.', '\.', $upload_domain );
				$this->debug_message( $escaped_upload_domain );
				if ( ! empty( $this->user_exclusions ) ) {
					$content = preg_replace( '#(https?:)?//(?:www\.)?' . $escaped_upload_domain . '([^"\'?>]+?)?/wp-content/([^"\'?>]+?)?(' . implode( '|', $this->user_exclusions ) . ')#i', '$1//' . $this->upload_domain . '$2/?wpcontent-bypass?/$3$4', $content );
				}
				if ( strpos( $content, '<use ' ) ) {
					// Pre-empt rewriting of files within <use> tags, particularly to prevent security errors for SVGs.
					$content = preg_replace( '#(<use.+?href=["\'])(https?:)?//(?:www\.)?' . $escaped_upload_domain . '([^"\'?>]+?)/wp-content/#is', '$1$2//' . $this->upload_domain . '$3/?wpcontent-bypass?/', $content );
				}
				// Pre-empt rewriting of wp-includes and wp-content if the extension is not allowed by using a temporary placeholder.
				$content = preg_replace( '#(https?:)?//(?:www\.)?' . $escaped_upload_domain . '([^"\'?>]+?)?/wp-content/([^"\'?>]+?)\.(htm|html|php|ashx|m4v|mov|wvm|qt|webm|ogv|mp4|m4p|mpg|mpeg|mpv)#i', '$1//' . $this->upload_domain . '$2/?wpcontent-bypass?/$3.$4', $content );
				$content = str_replace( 'wp-content/themes/jupiter"', '?wpcontent-bypass?/themes/jupiter"', $content );
				if (
					false !== strpos( $this->upload_domain, 'amazonaws.com' ) ||
					false !== strpos( $this->upload_domain, 'digitaloceanspaces.com' ) ||
					false !== strpos( $this->upload_domain, 'storage.googleapis.com' )
				) {
					$content = preg_replace( '#(https?:)?//(?:www\.)?' . $escaped_upload_domain . $this->remove_path . '/#i', '$1//' . $this->exactdn_domain . '/', $content );
				} else {
					$content = preg_replace( '#(https?:)?//(?:www\.)?' . $escaped_upload_domain . '/([^"\'?>]+?)?(nextgen-image|wp-includes|wp-content)/#i', '$1//' . $this->exactdn_domain . '/$2$3/', $content );
				}
				$content = str_replace( '?wpcontent-bypass?', 'wp-content', $content );
			}
			return $content;
		}

		/**
		 * Allow resizing of images for some admin-ajax requests.
		 *
		 * @param bool  $allow Will normally be false, unless already modified by another function.
		 * @param array $image Bunch of information about the image, but we don't care about that here.
		 * @return bool True if it's an allowable admin-ajax request, false for all other admin requests.
		 */
		function allow_admin_image_downsize( $allow, $image ) {
			if ( ! wp_doing_ajax() ) {
				return $allow;
			}
			if ( ! empty( $_POST['action'] ) && 'eddvbugm_viewport_downloads' === $_POST['action'] ) {
				return true;
			}
			if ( ! empty( $_POST['action'] ) && 'vc_get_vc_grid_data' === $_POST['action'] ) {
				return true;
			}
			if ( ! empty( $_POST['action'] ) && 'Essential_Grid_Front_request_ajax' === $_POST['action'] ) {
				return true;
			}
			if ( ! empty( $_POST['action'] ) && 'mabel-rpn-getnew-purchased-products' === $_POST['action'] ) {
				return true;
			}
			return $allow;
		}

		/**
		 * Disable resizing of images during image_downsize().
		 *
		 * @param mixed $param Could be anything (or nothing), we just pass it along untouched.
		 * @return mixed Just the same value, going back out the door.
		 */
		function disable_image_downsize( $param = false ) {
			remove_filter( 'image_downsize', array( $this, 'filter_image_downsize' ) );
			add_action( 'themify_after_post_image', array( $this, 'enable_image_downsize' ) );
			return $param;
		}

		/**
		 * Re-enable resizing of images during image_downsize().
		 */
		function enable_image_downsize() {
			add_filter( 'image_downsize', array( $this, 'filter_image_downsize' ), 10, 3 );
		}

		/**
		 * Change the default for processing an array of dimensions to scaling instead of cropping.
		 *
		 * @param array $exactdn_args The ExactDN args generated by filter_image_downsize() when $size is an array.
		 * @return array $exactdn_args The ExactDN args, with resize (crop) changed to fit (scale).
		 */
		function image_downsize_scale( $exactdn_args ) {
			if ( ! is_array( $exactdn_args ) ) {
				return $exactdn_args;
			}
			if ( ! empty( $exactdn_args['resize'] ) ) {
				$exactdn_args['fit'] = $exactdn_args['resize'];
				unset( $exactdn_args['resize'] );
			}
			return $exactdn_args;
		}

		/**
		 * Filter post thumbnail image retrieval, passing images through ExactDN.
		 *
		 * @param array|bool   $image Defaults to false, but may be a url if another plugin/theme has already filtered the value.
		 * @param int          $attachment_id The ID number for the image attachment.
		 * @param string|array $size The name of the image size or an array of width and height. Default 'medium'.
		 * @uses is_admin, apply_filters, wp_get_attachment_url, this::validate_image_url, this::image_sizes, this::generate_url
		 * @filter image_downsize
		 * @return string|bool
		 */
		function filter_image_downsize( $image, $attachment_id, $size ) {
			$started = microtime( true );
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );

			// Don't foul up the admin side of things, unless a plugin wants to.
			if ( is_admin() &&
				/**
				 * Provide plugins a way of running ExactDN for images in the WordPress Dashboard (wp-admin).
				 *
				 * Note: enabling this will result in ExactDN URLs added to your post content, which could make migrations across domains (and off ExactDN) a bit more challenging.
				 *
				 * @param bool false Allow ExactDN to run on the Dashboard. Default to false.
				 * @param array $args {
				 *     Array of image details.
				 *
				 *     @type array|bool  $image Image URL or false.
				 *     @type int          $attachment_id Attachment ID of the image.
				 *     @type array|string $size Image size. Can be a string (name of the image size, e.g. full) or an array of height and width.
				 * }
				 */
				false === apply_filters( 'exactdn_admin_allow_image_downsize', false, compact( 'image', 'attachment_id', 'size' ) )
			) {
				return $image;
			}

			/**
			 * Provide plugins a way of preventing ExactDN from being applied to images retrieved from WordPress Core.
			 *
			 * @param bool false Stop ExactDN from being applied to the image. Default to false.
			 * @param array $args {
			 *     Array of image details.
			 *
			 *     @type string|bool  $image Image URL or false.
			 *     @type int          $attachment_id Attachment ID of the image.
			 *     @type array|string $size Image size. Can be a string (name of the image size, e.g. full) or an array of height and width.
			 * }
			 */
			if ( apply_filters( 'exactdn_override_image_downsize', false, compact( 'image', 'attachment_id', 'size' ) ) ) {
				return $image;
			}

			if ( function_exists( 'aq_resize' ) ) {
				$this->debug_message( 'aq_resize detected, image_downsize filter disabled' );
				return $image;
			}

			if ( $this->filtering_the_content || $this->filtering_the_page ) {
				$this->debug_message( 'end image_downsize early' );
				return $image;
			}

			// Get the image URL and proceed with ExactDN replacement if successful.
			$image_url = wp_get_attachment_url( $attachment_id );
			/** This filter is already documented in class-exactdn.php */
			if ( apply_filters( 'exactdn_skip_image', false, $image_url, null ) ) {
				return $image;
			}
			$this->debug_message( $image_url );
			$this->debug_message( $attachment_id );
			if ( is_string( $size ) || is_int( $size ) ) {
				$this->debug_message( $size );
			} elseif ( is_array( $size ) ) {
				foreach ( $size as $dimension ) {
					$this->debug_message( 'dimension: ' . $dimension );
				}
			}
			// Set this to true later when we know we have size meta.
			$has_size_meta = false;

			if ( $image_url ) {
				// Check if image URL should be used with ExactDN.
				if ( ! $this->validate_image_url( $image_url ) ) {
					return $image;
				}

				$intermediate    = true; // For the fourth array item returned by the image_downsize filter.
				$resize_existing = defined( 'EXACTDN_RESIZE_EXISTING' ) && EXACTDN_RESIZE_EXISTING;

				// If an image is requested with a size known to WordPress, use that size's settings with ExactDN.
				if ( is_string( $size ) && array_key_exists( $size, $this->image_sizes() ) ) {
					$image_args = $this->image_sizes();
					$image_args = $image_args[ $size ];
					$this->debug_message( "image args for $size: " . $this->implode( ',', $image_args ) );

					$exactdn_args = array();

					$image_meta = image_get_intermediate_size( $attachment_id, $size );

					// 'full' is a special case: We need consistent data regardless of the requested size.
					if ( 'full' === $size ) {
						$image_meta   = wp_get_attachment_metadata( $attachment_id );
						$intermediate = false;
					} elseif ( ! $image_meta ) {
						$this->debug_message( 'still do not have meta, getting it now' );
						// If we still don't have any image meta at this point, it's probably from a custom thumbnail size
						// for an image that was uploaded before the custom image was added to the theme. Try to determine the size manually.
						$image_meta = wp_get_attachment_metadata( $attachment_id );

						if ( isset( $image_meta['width'], $image_meta['height'] ) ) {
							$image_resized = image_resize_dimensions( $image_meta['width'], $image_meta['height'], $image_args['width'], $image_args['height'], $image_args['crop'] );
							if ( $image_resized ) { // This could be false when the requested image size is larger than the full-size image.
								$image_meta['width']  = $image_resized[6];
								$image_meta['height'] = $image_resized[7];
							}
						}
					}
					if ( isset( $image_meta['width'], $image_meta['height'] ) ) {
						$image_args['width']  = $image_meta['width'];
						$image_args['height'] = $image_meta['height'];

						// NOTE: it will constrain an image to $content_width which is expected behavior in core, so far as I can see.
						list( $image_args['width'], $image_args['height'] ) = image_constrain_size_for_editor( $image_args['width'], $image_args['height'], $size, 'display' );

						$has_size_meta = true;
						$this->debug_message( 'image args constrained: ' . $this->implode( ',', $image_args ) );
					}

					$transform = $image_args['crop'] ? 'resize' : 'fit';

					// Check specified image dimensions and account for possible zero values; ExactDN fails to resize if a dimension is zero.
					if ( ! $image_args['width'] || ! $image_args['height'] ) {
						if ( ! $image_args['width'] && 0 < $image_args['height'] ) {
							$exactdn_args['h'] = $image_args['height'];
						} elseif ( ! $image_args['height'] && 0 < $image_args['width'] ) {
							$exactdn_args['w'] = $image_args['width'];
						}
					} else {
						if ( ! isset( $image_meta['sizes'] ) ) {
							$size_meta = $image_meta;
							// Because we don't have the "real" meta, just the height/width for the specific size.
							$this->debug_message( 'getting attachment meta now' );
							$image_meta = wp_get_attachment_metadata( $attachment_id );
						}
						if ( 'resize' === $transform && $image_meta && isset( $image_meta['width'], $image_meta['height'] ) ) {
							// Lets make sure that we don't upscale images since wp never upscales them as well.
							$smaller_width  = ( ( $image_meta['width'] < $image_args['width'] ) ? $image_meta['width'] : $image_args['width'] );
							$smaller_height = ( ( $image_meta['height'] < $image_args['height'] ) ? $image_meta['height'] : $image_args['height'] );

							$exactdn_args[ $transform ] = $smaller_width . ',' . $smaller_height;
						} else {
							$exactdn_args[ $transform ] = $image_args['width'] . ',' . $image_args['height'];
						}
					}

					if (
						! empty( $image_meta['sizes'] ) && ! empty( $image_meta['width'] ) && ! empty( $image_meta['height'] ) &&
						(int) $image_args['width'] === (int) $image_meta['width'] &&
						(int) $image_args['height'] === (int) $image_meta['height']
					) {
						$this->debug_message( 'image args match size of original, just use that' );
						$size = 'full';
					}
					if ( empty( $image_meta['sizes'] ) && ! empty( $size_meta ) ) {
						$image_meta['sizes'][ $size ] = $size_meta;
					}
					if ( ! empty( $image_meta['sizes'] ) && 'full' !== $size && ! empty( $image_meta['sizes'][ $size ]['file'] ) ) {
						$image_url_basename = wp_basename( $image_url );
						$intermediate_url   = str_replace( $image_url_basename, $image_meta['sizes'][ $size ]['file'], $image_url );

						if ( empty( $image_meta['width'] ) || empty( $image_meta['height'] ) ) {
							list( $filename_width, $filename_height ) = $this->get_dimensions_from_filename( $intermediate_url );
						}
						$filename_width  = $image_meta['width'] ? $image_meta['width'] : $filename_width;
						$filename_height = $image_meta['height'] ? $image_meta['height'] : $filename_height;
						if ( $filename_width && $filename_height && $image_args['width'] === $filename_width && $image_args['height'] === $filename_height ) {
							$image_url = $intermediate_url;
						} else {
							$resize_existing = true;
						}
					} else {
						$resize_existing = true;
					}

					$exactdn_args = $resize_existing && 'full' !== $size ? $this->maybe_smart_crop( $exactdn_args, $attachment_id, $image_meta ) : array();

					/**
					 * Filter the ExactDN arguments added to an image, when that image size is a string.
					 * Image size will be a string (e.g. "full", "medium") when it is known to WordPress.
					 *
					 * @param array $exactdn_args ExactDN arguments.
					 * @param array  $args {
					 *     Array of image details.
					 *
					 *     @type array  $image_args Image arguments (width, height, crop).
					 *     @type string $image_url Image URL.
					 *     @type int    $attachment_id Attachment ID of the image.
					 *     @type string $size Image size name.
					 *     @type string $transform Value can be resize or fit.
					 * }
					 */
					$exactdn_args = apply_filters( 'exactdn_image_downsize_string', $exactdn_args, compact( 'image_args', 'image_url', 'attachment_id', 'size', 'transform' ) );

					// Generate ExactDN URL.
					$image = array(
						$this->generate_url( $image_url, $exactdn_args ),
						$has_size_meta ? $image_args['width'] : false,
						$has_size_meta ? $image_args['height'] : false,
						$intermediate,
					);
				} elseif ( is_array( $size ) ) {
					// Pull width and height values from the provided array, if possible.
					$width  = isset( $size[0] ) ? (int) $size[0] : false;
					$height = isset( $size[1] ) ? (int) $size[1] : false;

					// Don't bother if necessary parameters aren't passed.
					if ( ! $width || ! $height ) {
						return $image;
					}
					$this->debug_message( "requested w$width by h$height" );

					$image_meta = wp_get_attachment_metadata( $attachment_id );
					if ( isset( $image_meta['width'], $image_meta['height'] ) ) {
						$image_resized = image_resize_dimensions( $image_meta['width'], $image_meta['height'], $width, $height, true );

						if ( $image_resized ) { // This could be false when the requested image size is larger than the full-size image.
							$width  = $image_resized[6];
							$height = $image_resized[7];
							$this->debug_message( "using resize dims w$width by h$height" );
						} else {
							$width  = $image_meta['width'];
							$height = $image_meta['height'];
							$this->debug_message( "using meta dims w$width by h$height" );
						}
						$has_size_meta = true;
					}

					list( $width, $height ) = image_constrain_size_for_editor( $width, $height, $size );
					$this->debug_message( "constrained to w$width by h$height" );

					// Expose arguments to a filter before passing to ExactDN.
					$exactdn_args = array(
						'resize' => $width . ',' . $height,
					);

					$exactdn_args = $this->maybe_smart_crop( $exactdn_args, $attachment_id, $image_meta );

					/**
					 * Filter the ExactDN arguments added to an image, when the image size is an array of height and width values.
					 *
					 * @param array $exactdn_args ExactDN arguments/parameters.
					 * @param array $args {
					 *     Array of image details.
					 *
					 *     @type int    $width Image width.
					 *     @type int    $height Image height.
					 *     @type string $image_url Image URL.
					 *     @type int    $attachment_id Attachment ID of the image.
					 * }
					 */
					$exactdn_args = apply_filters( 'exactdn_image_downsize_array', $exactdn_args, compact( 'width', 'height', 'image_url', 'attachment_id' ) );

					// Generate ExactDN URL.
					$image = array(
						$this->generate_url( $image_url, $exactdn_args ),
						$has_size_meta ? $width : false,
						$has_size_meta ? $height : false,
						$intermediate,
					);
				}
			}
			if ( ! empty( $image[0] ) && is_string( $image[0] ) ) {
				$this->debug_message( $image[0] );
			}
			$this->debug_message( 'end image_downsize' );
			$elapsed_time = microtime( true ) - $started;
			$this->debug_message( "parsing image_downsize took $elapsed_time seconds" );
			$this->elapsed_time += microtime( true ) - $started;
			return $image;
		}

		/**
		 * Filters an array of image `srcset` values, replacing each URL with its ExactDN equivalent.
		 *
		 * @param array  $sources An array of image urls and widths.
		 * @param array  $size_array Array of width and height values in pixels.
		 * @param string $image_src The 'src' of the image.
		 * @param array  $image_meta The image metadata as returned by 'wp_get_attachment_metadata()'.
		 * @param int    $attachment_id Image attachment ID or 0.
		 * @uses this::validate_image_url, this::generate_url, this::parse_from_filename
		 * @uses this::strip_image_dimensions_maybe, this::get_content_width
		 * @return array An array of ExactDN image urls and widths.
		 */
		public function filter_srcset_array( $sources = array(), $size_array = array(), $image_src = '', $image_meta = array(), $attachment_id = 0 ) {
			$started = microtime( true );
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			// Don't foul up the admin side of things, unless a plugin wants to.
			if ( is_admin() &&
				/**
				 * Provide plugins a way of running ExactDN for images in the WordPress Dashboard (wp-admin).
				 *
				 * @param bool false Stop ExactDN from being run on the Dashboard. Default to false, use true to run in wp-admin.
				 * @param array $args {
				 *     Array of image details.
				 *
				 *     @type string|bool  $image Image URL or false.
				 *     @type int          $attachment_id Attachment ID of the image.
				 * }
				 */
				false === apply_filters( 'exactdn_admin_allow_image_srcset', false, compact( 'image_src', 'attachment_id' ) )
			) {
				return $sources;
			}

			if ( ! is_array( $sources ) ) {
				return $sources;
			}

			$upload_dir      = wp_get_upload_dir();
			$resize_existing = defined( 'EXACTDN_RESIZE_EXISTING' ) && EXACTDN_RESIZE_EXISTING;
			$w_descriptor    = true;

			foreach ( $sources as $i => $source ) {
				if ( 'x' === $source['descriptor'] ) {
					$w_descriptor = false;
				}
				if ( ! $this->validate_image_url( $source['url'] ) ) {
					continue;
				}

				/** This filter is already documented in class-exactdn.php */
				if ( apply_filters( 'exactdn_skip_image', false, $source['url'], $source ) ) {
					continue;
				}

				$url = $source['url'];

				list( $width, $height ) = $this->get_dimensions_from_filename( $url );
				if ( ! $resize_existing && 'w' === $source['descriptor'] && (int) $source['value'] === (int) $width ) {
					$this->debug_message( "preventing further processing for $url" );
					$sources[ $i ]['url'] = $this->generate_url( $source['url'] );
					continue;
				}

				if ( $image_meta && ! empty( $image_meta['width'] ) ) {
					if ( ( $height && (int) $image_meta['height'] === (int) $height && $width && (int) $image_meta['width'] === (int) $width ) ||
						( ! $height && ! $width && (int) $image_meta['width'] === (int) $source['value'] )
					) {
						$this->debug_message( "preventing further processing for (detected) full-size $url" );
						$sources[ $i ]['url'] = $this->generate_url( $source['url'] );
						continue;
					}
				}

				$this->debug_message( 'continuing: ' . $width . ' vs. ' . $source['value'] );

				// It's quicker to get the full size with the data we have already, if available.
				if ( ! empty( $attachment_id ) ) {
					$url = wp_get_attachment_url( $attachment_id );
				} else {
					$url = $this->strip_image_dimensions_maybe( $url );
				}
				$this->debug_message( "building srcs from $url" );

				$args = array();
				if ( 'w' === $source['descriptor'] ) {
					if ( $height && ( (int) $source['value'] === (int) $width ) ) {
						$args['resize'] = $width . ',' . $height;
					} else {
						$args['w'] = $source['value'];
					}
				}

				$args = $this->maybe_smart_crop( $args, $attachment_id, $image_meta );

				$sources[ $i ]['url'] = $this->generate_url( $url, $args );
			}

			/**
			 * At this point, $sources is the original srcset with ExactDN URLs.
			 * Now, we're going to construct additional sizes based on multiples of the content_width.
			 */

			/**
			 * Filter the multiplier ExactDN uses to create new srcset items.
			 * Return false to short-circuit and bypass auto-generation.
			 *
			 * @param array|bool $multipliers Array of multipliers to use or false to bypass.
			 */
			$multipliers = apply_filters( 'exactdn_srcset_multipliers', array( .2, .4, .6, .8, 1, 2, 3, 1920 ) );
			$url         = trailingslashit( $upload_dir['baseurl'] ) . $image_meta['file'];
			if ( ! $w_descriptor ) {
				$this->debug_message( 'using x descriptors instead of w' );
				$multipliers = array_filter( $multipliers, 'is_int' );
			}

			if (
				/** Short-circuit via exactdn_srcset_multipliers filter. */
				is_array( $multipliers )
				/** This filter is already documented in class-exactdn.php */
				&& ! apply_filters( 'exactdn_skip_image', false, $url, null )
				/** The original url is valid/allowed. */
				&& $this->validate_image_url( $url )
				/** Verify basic meta is intact. */
				&& isset( $image_meta['width'] ) && isset( $image_meta['height'] ) && isset( $image_meta['file'] )
				/** Verify we have the requested width/height. */
				&& isset( $size_array[0] ) && isset( $size_array[1] )
			) {

				$fullwidth  = $image_meta['width'];
				$fullheight = $image_meta['height'];
				$reqwidth   = $size_array[0];
				$reqheight  = $size_array[1];
				$this->debug_message( "filling additional sizes with requested w $reqwidth h $reqheight full w $fullwidth full h $fullheight" );

				$constrained_size = wp_constrain_dimensions( $fullwidth, $fullheight, $reqwidth );
				$expected_size    = array( $reqwidth, $reqheight );

				$this->debug_message( $constrained_size[0] );
				$this->debug_message( $constrained_size[1] );
				if ( abs( $constrained_size[0] - $expected_size[0] ) <= 1 && abs( $constrained_size[1] - $expected_size[1] ) <= 1 ) {
					$this->debug_message( 'soft cropping' );
					$crop = 'soft';
					$base = $this->get_content_width(); // Provide a default width if none set by the theme.
				} else {
					$this->debug_message( 'hard cropping' );
					$crop = 'hard';
					$base = $reqwidth;
				}
				$this->debug_message( "base width: $base" );

				$currentwidths = array_keys( $sources );
				$newsources    = null;

				foreach ( $multipliers as $multiplier ) {

					$newwidth = intval( $base * $multiplier );
					if ( 1920 === (int) $multiplier ) {
						$newwidth = 1920;
						if ( ! $w_descriptor ) {
							continue;
						}
					}
					if ( $newwidth < 50 ) {
						continue;
					}
					foreach ( $currentwidths as $currentwidth ) {
						// If a new width would be within 50 pixels of an existing one or larger than the full size image, skip.
						if ( abs( $currentwidth - $newwidth ) < 50 || ( $newwidth > $fullwidth ) ) {
							continue 2; // Back to the foreach ( $multipliers as $multiplier ).
						}
					} // foreach ( $currentwidths as $currentwidth ){

					if ( 1 === $multiplier && abs( $newwidth - $fullwidth ) < 5 ) {
						$args = array();
					} elseif ( 'soft' === $crop ) {
						$args = array(
							'w' => $newwidth,
						);
					} else { // hard crop, e.g. add_image_size( 'example', 200, 200, true ).
						$args = array(
							'zoom'   => $multiplier,
							'resize' => $reqwidth . ',' . $reqheight,
						);
					}

					$args = $this->maybe_smart_crop( $args, $attachment_id, $image_meta );

					$newsources[ $newwidth ] = array(
						'url'        => $this->generate_url( $url, $args ),
						'descriptor' => ( $w_descriptor ? 'w' : 'x' ),
						'value'      => ( $w_descriptor ? $newwidth : $multiplier ),
					);

					$currentwidths[] = $newwidth;
				} // foreach ( $multipliers as $multiplier )

				if ( is_array( $newsources ) ) {
					$sources = array_replace( $sources, $newsources );
				}
			} // if ( isset( $image_meta['width'] ) && isset( $image_meta['file'] ) )
			$elapsed_time = microtime( true ) - $started;
			$this->debug_message( "parsing srcset took $elapsed_time seconds" );
			/* $this->debug_message( print_r( $sources, true ) ); */
			$this->elapsed_time += microtime( true ) - $started;
			return $sources;
		}

		/**
		 * Filters an array of image `sizes` values, using $content_width instead of image's full size.
		 *
		 * @param array $sizes An array of media query breakpoints.
		 * @param array $size  Width and height of the image.
		 * @uses this::get_content_width
		 * @return array An array of media query breakpoints.
		 */
		public function filter_sizes( $sizes, $size ) {
			$started = microtime( true );
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			if ( ! doing_filter( 'the_content' ) ) {
				return $sizes;
			}
			$content_width = $this->get_content_width();

			if ( ( is_array( $size ) && $size[0] < $content_width ) ) {
				return $sizes;
			}

			$elapsed_time = microtime( true ) - $started;
			$this->debug_message( "parsing sizes took $elapsed_time seconds" );
			$this->elapsed_time += microtime( true ) - $started;
			return sprintf( '(max-width: %1$dpx) 100vw, %1$dpx', $content_width );
		}

		/**
		 * Creates an image `srcset` attribute based on the detected width.
		 *
		 * @param string $url The url of the image.
		 * @param int    $width Image width to use for calculations.
		 * @param bool   $zoom Whether to use zoom or w param.
		 * @param int    $filename_width The width derived from the filename, or false.
		 * @uses this::generate_url
		 * @return string A srcset attribute with ExactDN image urls and widths.
		 */
		public function generate_image_srcset( $url, $width, $zoom = false, $filename_width = false ) {
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			// Don't foul up the admin side of things.
			if ( is_admin() ) {
				return '';
			}

			if ( ! is_numeric( $width ) ) {
				return '';
			}

			/**
			 * Filter the multiplier ExactDN uses to create new srcset items.
			 * Return false to short-circuit and bypass auto-generation.
			 *
			 * @param array|bool $multipliers Array of multipliers to use or false to bypass.
			 */
			$multipliers = apply_filters( 'exactdn_srcset_multipliers', array( .2, .4, .6, .8, 1, 2, 3, 1920 ) );
			/**
			 * Filter the width ExactDN will use to create srcset attribute.
			 * Return a falsy value to short-circuit and bypass srcset fill.
			 *
			 * @param int|bool $width The max width for this $url, or false to bypass.
			 */
			$width = (int) apply_filters( 'exactdn_srcset_fill_width', $width, $url );
			if ( ! $width ) {
				return '';
			}
			$srcset        = '';
			$currentwidths = array();

			if (
				/** Short-circuit via exactdn_srcset_multipliers filter. */
				is_array( $multipliers )
				&& $width
				/** This filter is already documented in class-exactdn.php */
				&& ! apply_filters( 'exactdn_skip_image', false, $url, null )
			) {
				$sources = null;

				foreach ( $multipliers as $multiplier ) {
					$newwidth = intval( $width * $multiplier );
					if ( 1920 === (int) $multiplier ) {
						$newwidth = 1920;
					}
					if ( $newwidth < 50 ) {
						continue;
					}
					foreach ( $currentwidths as $currentwidth ) {
						// If a new width would be within 50 pixels of an existing one or larger than the full size image, skip.
						if ( 1 !== $multiplier && abs( $currentwidth - $newwidth ) < 50 ) {
							continue 2; // Back to the foreach ( $multipliers as $multiplier ).
						}
					} // foreach ( $currentwidths as $currentwidth ){
					if ( $filename_width && $newwidth > $filename_width ) {
						continue;
					}

					if ( 1 === $multiplier ) {
						$args = array();
					} elseif ( $zoom ) {
						$args = array(
							'zoom' => $multiplier,
						);
					} else {
						$args = array(
							'w' => $newwidth,
						);
					}

					$sources[ $newwidth ] = array(
						'url'        => $this->generate_url( $url, $args ),
						'descriptor' => 'w',
						'value'      => $newwidth,
					);

					$currentwidths[] = $newwidth;
				}
			}
			if ( ! empty( $sources ) ) {
				foreach ( $sources as $source ) {
					$srcset .= str_replace( ' ', '%20', $source['url'] ) . ' ' . $source['value'] . $source['descriptor'] . ', ';
				}
			}
			/* $this->debug_message( print_r( $sources, true ) ); */
			return rtrim( $srcset, ', ' );
		}

		/**
		 * Check for smart-cropping plugin to adjust cropping parameters.
		 * Currently supports Theia Smart Thumbnails using the theiaSmartThumbnails_position meta.
		 *
		 * @param array $args The arguments that have been generated so far.
		 * @param int   $attachment_id The ID number for the current image.
		 * @param array $meta Optional. The attachment (image) metadata. Default false.
		 * @return array The arguments, possibly altered for smart cropping.
		 */
		function maybe_smart_crop( $args, $attachment_id, $meta = false ) {
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			if ( ! empty( $args['crop'] ) ) {
				$this->debug_message( 'already cropped' );
				return $args;
			}
			// Doing something other than a hard crop, or we don't know what the ID is.
			if ( empty( $args['resize'] ) || empty( $attachment_id ) ) {
				$this->debug_message( 'not resizing, so no custom crop' );
				return $args;
			}
			// TST is not active.
			if ( ! defined( 'TST_VERSION' ) ) {
				$this->debug_message( 'no TST plugin' );
				return $args;
			}
			if ( ! class_exists( 'TstPostOptions' ) || ! defined( 'TstPostOptions::META_POSITION' ) ) {
				$this->debug_message( 'no TstPostOptions class' );
				return $args;
			}
			if ( ! $meta || ! is_array( $meta ) || empty( $meta['sizes'] ) ) {
				// $focus_point = get_post_meta( $attachment_id, TstPostOptions::META_POSITION, true );
				$meta = wp_get_attachment_metadata( $attachment_id );
				if ( ! is_array( $meta ) || empty( $meta['width'] ) || empty( $meta['height'] ) ) {
					$this->debug_message( 'unusable meta retrieved' );
					return $args;
				}
				$focus_point = TstPostOptions::get_meta( $attachment_id, $meta['width'], $meta['height'] );
			} elseif ( ! empty( $meta['tst_thumbnail_version'] ) ) {
				if ( empty( $meta['width'] ) || empty( $meta['height'] ) ) {
					$this->debug_message( 'unusable meta passed' );
					return $args;
				}
				$focus_point = TstPostOptions::get_meta( $attachment_id, $meta['width'], $meta['height'] );
			} else {
				$this->debug_message( 'unusable meta' );
				return $args;
			}
			if ( empty( $focus_point ) || ! is_array( $focus_point ) ) {
				$this->debug_message( 'unusable focus point' );
				return $args;
			}

			$dimensions = explode( ',', $args['resize'] );

			$new_w = $dimensions[0];
			$new_h = $dimensions[1];
			$this->debug_message( "full size dims: w{$meta['width']} h{$meta['height']}" );
			$this->debug_message( "smart crop dims: w$new_w h$new_h" );
			if ( ! empty( $args['zoom'] ) ) {
				$new_w = round( $args['zoom'] * $new_w );
				$new_h = round( $args['zoom'] * $new_h );
				$this->debug_message( "zooming: {$args['zoom']} w$new_w h$new_h" );
			}
			if ( ! $new_w || ! $new_h ) {
				$this->debug_message( 'empty dimension, not cropping' );
				return $args;
			}
			$size_ratio = max( $new_w / $meta['width'], $new_h / $meta['height'] );
			$crop_w     = round( $new_w / $size_ratio );
			$crop_h     = round( $new_h / $size_ratio );
			$s_x        = floor( ( $meta['width'] - $crop_w ) * $focus_point[0] );
			$s_y        = floor( ( $meta['height'] - $crop_h ) * $focus_point[1] );
			$this->debug_message( "doing the math with size_ratio of $size_ratio" );

			$args['crop'] = $s_x . ',' . $s_y . ',' . $crop_w . ',' . $crop_h;
			$this->debug_message( $args['crop'] );
			return $args;
		}

		/**
		 * Check if this is a REST API request that we should handle (or not).
		 *
		 * @param WP_HTTP_Response $response Result to send to the client. Usually a WP_REST_Response.
		 * @param WP_REST_Server   $handler  ResponseHandler instance (usually WP_REST_Server).
		 * @param WP_REST_Request  $request  Request used to generate the response.
		 * @return WP_HTTP_Response The result, unaltered.
		 */
		function parse_restapi_maybe( $response, $handler, $request ) {
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			if ( ! is_a( $request, 'WP_REST_Request' ) ) {
				$this->debug_message( 'oddball REST request or handler' );
				return $response; // Something isn't right, bail.
			}
			$route = $request->get_route();
			if ( is_string( $route ) ) {
				$this->debug_message( "current REST route is $route" );
			}
			if ( is_string( $route ) && false !== strpos( $route, 'wp/v2/media/' ) && ! empty( $request['context'] ) && 'edit' === $request['context'] ) {
				$this->debug_message( 'REST API media endpoint from post editor' );
				// We don't want ExactDN urls anywhere near the editor, so disable everything we can.
				add_filter( 'exactdn_override_image_downsize', '__return_true', PHP_INT_MAX );
				add_filter( 'exactdn_skip_image', '__return_true', PHP_INT_MAX ); // This skips existing srcset indices.
				add_filter( 'exactdn_srcset_multipliers', '__return_false', PHP_INT_MAX ); // This one skips the additional multipliers.
			}
			return $response;
		}

		/**
		 * Make sure the image domain is on the list of approved domains.
		 *
		 * @param string $domain The hostname to validate.
		 * @return bool True if the hostname is allowed, false otherwise.
		 */
		public function allow_image_domain( $domain ) {
			$domain = trim( $domain );
			foreach ( $this->allowed_domains as $allowed ) {
				$allowed = trim( $allowed );
				if ( $domain === $allowed ) {
					return true;
				}
			}
			return false;
		}

		/**
		 * Ensure image URL is valid for ExactDN.
		 * Though ExactDN functions address some of the URL issues, we should avoid unnecessary processing if we know early on that the image isn't supported.
		 *
		 * @param string $url The image url to be validated.
		 * @param bool   $exactdn_is_valid Optional. Whether an ExactDN URL should be considered valid. Default false.
		 * @uses wp_parse_args
		 * @return bool True if the url is considerd valid, false otherwise.
		 */
		protected function validate_image_url( $url, $exactdn_is_valid = false ) {
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			if ( false !== strpos( $url, 'data:image/' ) ) {
				$this->debug_message( "could not parse data uri: $url" );
				return false;
			}
			$parsed_url = $this->parse_url( $url );
			if ( ! $parsed_url ) {
				$this->debug_message( "could not parse: $url" );
				return false;
			}

			// Parse URL and ensure needed keys exist, since the array returned by `parse_url` only includes the URL components it finds.
			$url_info = wp_parse_args(
				$parsed_url,
				array(
					'scheme' => null,
					'host'   => null,
					'port'   => null,
					'path'   => null,
				)
			);

			// Bail if scheme isn't http or port is set that isn't port 80.
			if (
				( 'http' !== $url_info['scheme'] || ( 80 !== (int) $url_info['port'] && ! is_null( $url_info['port'] ) ) ) &&
				/**
				 * Tells ExactDN to ignore images that are served via HTTPS.
				 *
				 * @param bool $reject_https Should ExactDN ignore images using the HTTPS scheme. Default to false.
				 */
				apply_filters( 'exactdn_reject_https', false )
			) {
				$this->debug_message( 'rejected https via filter' );
				return false;
			}

			// Bail if no host is found.
			if ( is_null( $url_info['host'] ) ) {
				$this->debug_message( 'null host' );
				return false;
			}

			// Bail if the image already went through ExactDN.
			if ( ! $exactdn_is_valid && $this->exactdn_domain === $url_info['host'] ) {
				$this->debug_message( 'exactdn image' );
				return false;
			}

			// Bail if the image already went through Photon to avoid conflicts.
			if ( preg_match( '#^i[\d]{1}.wp.com$#i', $url_info['host'] ) ) {
				$this->debug_message( 'photon/wp.com image' );
				return false;
			}

			// Bail if no path is found.
			if ( is_null( $url_info['path'] ) ) {
				$this->debug_message( 'null path' );
				return false;
			}

			// Ensure image extension is acceptable, unless it's a dynamic NextGEN image.
			if ( ! in_array( strtolower( pathinfo( $url_info['path'], PATHINFO_EXTENSION ) ), $this->extensions, true ) && false === strpos( $url_info['path'], 'nextgen-image/' ) ) {
				$this->debug_message( 'invalid extension' );
				return false;
			}

			// Make sure this is an allowed image domain/hostname for ExactDN on this site.
			if ( ! $this->allow_image_domain( $url_info['host'] ) ) {
				$this->debug_message( 'invalid host for ExactDN' );
				return false;
			}

			// If we got this far, we should have an acceptable image URL,
			// but let folks filter to decline if they prefer.
			/**
			 * Overwrite the results of the previous validation steps an image goes through to be considered valid for ExactDN.
			 *
			 * @param bool true Is the image URL valid and can it be used by ExactDN. Default to true.
			 * @param string $url Image URL.
			 * @param array $parsed_url Array of information about the image url.
			 */
			return apply_filters( 'exactdn_validate_image_url', true, $url, $parsed_url );
		}

		/**
		 * Checks if the file exists before it passes the file to ExactDN.
		 *
		 * @param string $src The image URL.
		 * @return string The possibly altered URL without dimensions.
		 **/
		protected function strip_image_dimensions_maybe( $src ) {
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			$stripped_src = $src;

			// Build URL, first removing WP's resized string so we pass the original image to ExactDN.
			if ( preg_match( '#(-\d+x\d+)\.(' . implode( '|', $this->extensions ) . '){1}(?:\?.+)?$#i', $src, $src_parts ) ) {
				$stripped_src = str_replace( $src_parts[1], '', $src );
				$upload_dir   = wp_get_upload_dir();

				// Extracts the file path to the image minus the base url.
				$file_path = substr( $stripped_src, strlen( $upload_dir['baseurl'] ) );

				if ( is_file( $upload_dir['basedir'] . $file_path ) ) {
					$src = $stripped_src;
				}
				$this->debug_message( 'stripped dims' );
			}
			return $src;
		}

		/**
		 * Provide an array of available image sizes and corresponding dimensions.
		 * Similar to get_intermediate_image_sizes() except that it includes image sizes' dimensions, not just their names.
		 *
		 * @global $wp_additional_image_sizes
		 * @uses get_option
		 * @return array
		 */
		protected function image_sizes() {
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			if ( is_null( self::$image_sizes ) ) {
				global $_wp_additional_image_sizes;

				// Populate an array matching the data structure of $_wp_additional_image_sizes so we have a consistent structure for image sizes.
				$images = array(
					'thumb'  => array(
						'width'  => intval( get_option( 'thumbnail_size_w' ) ),
						'height' => intval( get_option( 'thumbnail_size_h' ) ),
						'crop'   => (bool) get_option( 'thumbnail_crop' ),
					),
					'medium' => array(
						'width'  => intval( get_option( 'medium_size_w' ) ),
						'height' => intval( get_option( 'medium_size_h' ) ),
						'crop'   => false,
					),
					'large'  => array(
						'width'  => intval( get_option( 'large_size_w' ) ),
						'height' => intval( get_option( 'large_size_h' ) ),
						'crop'   => false,
					),
					'full'   => array(
						'width'  => null,
						'height' => null,
						'crop'   => false,
					),
				);

				// Compatibility mapping as found in wp-includes/media.php.
				$images['thumbnail'] = $images['thumb'];

				// Update class variable, merging in $_wp_additional_image_sizes if any are set.
				if ( is_array( $_wp_additional_image_sizes ) && ! empty( $_wp_additional_image_sizes ) ) {
					self::$image_sizes = array_merge( $images, $_wp_additional_image_sizes );
				} else {
					self::$image_sizes = $images;
				}
			}

			return is_array( self::$image_sizes ) ? self::$image_sizes : array();
		}

		/**
		 * Handle image urls within the NextGEN pro lightbox displays.
		 *
		 * @param array $images An array of NextGEN images and associate attributes.
		 * @return array The ExactDNified array of images.
		 */
		function ngg_pro_lightbox_images_queue( $images ) {
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			if ( $this->is_iterable( $images ) ) {
				foreach ( $images as $index => $image ) {
					if ( ! empty( $image['image'] ) && $this->validate_image_url( $image['image'] ) ) {
						$images[ $index ]['image'] = $this->generate_url( $image['image'] );
					}
					if ( ! empty( $image['thumb'] ) && $this->validate_image_url( $image['thumb'] ) ) {
						$images[ $index ]['thumb'] = $this->generate_url( $image['thumb'] );
					}
					if ( ! empty( $image['full_image'] ) && $this->validate_image_url( $image['full_image'] ) ) {
						$images[ $index ]['full_image'] = $this->generate_url( $image['full_image'] );
					}
					if ( $this->is_iterable( $image['srcsets'] ) ) {
						foreach ( $image['srcsets'] as $size => $srcset ) {
							if ( $this->validate_image_url( $srcset ) ) {
								$images[ $index ]['srcsets'][ $size ] = $this->generate_url( $srcset );
							}
						}
					}
					if ( $this->is_iterable( $image['full_srcsets'] ) ) {
						foreach ( $image['full_srcsets'] as $size => $srcset ) {
							if ( $this->validate_image_url( $srcset ) ) {
								$images[ $index ]['full_srcsets'][ $size ] = $this->generate_url( $srcset );
							}
						}
					}
				}
			}
			return $images;
		}

		/**
		 * Handle image urls within NextGEN.
		 *
		 * @param string $image A url for a NextGEN image.
		 * @return string The ExactDNified image url.
		 */
		function ngg_get_image_url( $image ) {
			// Don't foul up the admin side of things, unless a plugin wants to.
			if ( is_admin() &&
				/**
				 * Provide plugins a way of running ExactDN for images in the WordPress Dashboard (wp-admin).
				 *
				 * @param bool false Stop ExactDN from being run on the Dashboard. Default to false, use true to run in wp-admin.
				 * @param array $args {
				 *     Array of image details.
				 *
				 *     @type string|bool  $image Image URL or false.
				 *     @type int          $attachment_id Attachment ID of the image.
				 * }
				 */
				false === apply_filters( 'exactdn_admin_allow_ngg_url', false, $image )
			) {
				return $image;
			}
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			if ( $this->validate_image_url( $image ) ) {
				return $this->generate_url( $image );
			}
			return $image;
		}

		/**
		 * Handle images in legacy WooCommerce API endpoints.
		 *
		 * @param array $product_data The product information that will be returned via the API.
		 * @return array The product information with ExactDNified image urls.
		 */
		function woocommerce_api_product_response( $product_data ) {
			if ( is_array( $product_data ) && ! empty( $product_data['featured_src'] ) ) {
				if ( $this->validate_image_url( $product_data['featured_src'] ) ) {
					$product_data['featured_src'] = $this->generate_url( $product_data['featured_src'] );
				}
			}
			return $product_data;
		}

		/**
		 * Suppress query args for certain files, typically for placholder images.
		 *
		 * @param array|string $args Array of ExactDN arguments.
		 * @param string       $image_url Image URL.
		 * @param string|null  $scheme Image scheme. Default to null.
		 * @return array Empty if it matches our search, otherwise just $args untouched.
		 */
		function exactdn_remove_args( $args, $image_url, $scheme ) {
			if ( strpos( $image_url, 'ewww/lazy/placeholder' ) ) {
				return array();
			}
			if ( strpos( $image_url, 'easyio/lazy/placeholder' ) ) {
				return array();
			}
			if ( strpos( $image_url, 'revslider/admin/assets/images/dummy.png' ) ) {
				return array();
			}
			if ( strpos( $image_url, '/lazy.png' ) ) {
				return array();
			}
			if ( strpos( $image_url, 'lazy_placeholder.gif' ) ) {
				return array();
			}
			if ( strpos( $image_url, '/assets/images/' ) ) {
				return array();
			}
			if ( strpos( $image_url, 'LayerSlider/static/img' ) ) {
				return array();
			}
			if ( strpos( $image_url, 'lazy-load/images/' ) ) {
				return array();
			}
			if ( strpos( $image_url, 'public/images/spacer.' ) ) {
				return array();
			}
			return $args;
		}

		/**
		 * Exclude images and other resources from being processed based on user specified list.
		 *
		 * @since 4.6.0
		 *
		 * @param boolean $skip Whether ExactDN should skip processing.
		 * @param string  $url Resource URL.
		 * @return boolean True to skip the resource, unchanged otherwise.
		 */
		function exactdn_skip_user_exclusions( $skip, $url ) {
			if ( $this->user_exclusions ) {
				foreach ( $this->user_exclusions as $exclusion ) {
					if ( false !== strpos( $url, $exclusion ) ) {
						$this->debug_message( "user excluded $url via $exclusion" );
						return true;
					}
				}
			}
			return $skip;
		}

		/**
		 * Converts a local script/css url to use ExactDN.
		 *
		 * @param string $url URL to the resource being parsed.
		 * @return string The ExactDN version of the resource, if it was local.
		 */
		function parse_enqueue( $url ) {
			if ( is_admin() ) {
				return $url;
			}
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			$parsed_url = $this->parse_url( $url );

			if ( false !== strpos( $url, 'wp-admin/' ) ) {
				return $url;
			}
			if ( false !== strpos( $url, 'xmlrpc.php' ) ) {
				return $url;
			}
			/**
			 * Allow specific URLs to avoid going through ExactDN.
			 *
			 * @param bool false Should the URL be returned as is, without going through ExactDN. Default to false.
			 * @param string $url Resource URL.
			 * @param array|string $args Array of ExactDN arguments.
			 * @param string|null $scheme URL scheme. Default to null.
			 */
			if ( true === apply_filters( 'exactdn_skip_for_url', false, $url, array(), null ) ) {
				return $url;
			}

			// Unable to parse.
			if ( ! $parsed_url || ! is_array( $parsed_url ) || empty( $parsed_url['host'] ) || empty( $parsed_url['path'] ) ) {
				$this->debug_message( 'src url no good' );
				return $url;
			}

			// No PHP files shall pass.
			if ( preg_match( '/\.php$/', $parsed_url['path'] ) ) {
				return $url;
			}

			// Make sure this is an allowed image domain/hostname for ExactDN on this site.
			if ( ! $this->allow_image_domain( $parsed_url['host'] ) ) {
				$this->debug_message( "invalid host for ExactDN: {$parsed_url['host']}" );
				return $url;
			}

			// Figure out which CDN (sub)domain to use.
			if ( empty( $this->exactdn_domain ) ) {
				$this->debug_message( 'no exactdn domain configured' );
				return $url;
			}

			// You can't run an ExactDN URL through again because query strings are stripped.
			// So if the image is already an ExactDN URL, append the new arguments to the existing URL.
			if ( $this->exactdn_domain === $parsed_url['host'] ) {
				$this->debug_message( 'url already has exactdn domain' );
				return $url;
			}

			global $wp_version;
			// If a resource doesn't have a version string, we add one to help with cache-busting.
			if (
				(
					empty( $parsed_url['query'] ) ||
					( 'ver=' . $wp_version === $parsed_url['query'] && false !== strpos( $url, 'wp-content/themes/' ) )
				) &&
				false !== strpos( $url, 'wp-content/' )
			) {
				$modified = $this->function_exists( 'filemtime' ) ? filemtime( get_template_directory() ) : '';
				if ( empty( $modified ) ) {
					$modified = $this->version;
				}
				/**
				 * Allows a custom version string for resources that are missing one.
				 *
				 * @param string Defaults to the modified time of the theme folder, and falls back to the plugin version.
				 */
				$parsed_url['query'] = apply_filters( 'exactdn_version_string', "m=$modified" );
			} elseif ( empty( $parsed_url['query'] ) ) {
				$parsed_url['query'] = '';
			}

			$exactdn_url = '//' . $this->exactdn_domain . '/' . ltrim( $parsed_url['path'], '/' ) . '?' . $parsed_url['query'];
			$this->debug_message( "exactdn css/script url: $exactdn_url" );
			return $exactdn_url;
		}

		/**
		 * Generates an ExactDN URL.
		 *
		 * @param string       $image_url URL to the publicly accessible image you want to manipulate.
		 * @param array|string $args An array of arguments, i.e. array( 'w' => '300', 'resize' => '123,456' ), or in string form (w=123&h=456).
		 * @param string       $scheme Indicates http or https, other schemes are invalid.
		 * @return string The raw final URL. You should run this through esc_url() before displaying it.
		 */
		function generate_url( $image_url, $args = array(), $scheme = null ) {
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			$image_url = trim( $image_url );

			if ( is_null( $scheme ) ) {
				$scheme = $this->scheme;
			}

			/**
			 * Disables ExactDN URL processing for local development.
			 *
			 * @param bool false default
			 */
			if ( true === apply_filters( 'exactdn_development_mode', false ) ) {
				return $image_url;
			}

			/**
			 * Allow specific URLs to avoid going through ExactDN.
			 *
			 * @param bool false Should the URL be returned as is, without going through ExactDN. Default to false.
			 * @param string $image_url Resource URL.
			 * @param array|string $args Array of ExactDN arguments.
			 * @param string|null $scheme URL scheme. Default to null.
			 */
			if ( true === apply_filters( 'exactdn_skip_for_url', false, $image_url, $args, $scheme ) ) {
				return $image_url;
			}

			$jpg_quality  = apply_filters( 'jpeg_quality', null, 'image_resize' );
			$webp_quality = apply_filters( 'jpeg_quality', $jpg_quality, 'image/webp' );

			$more_args = array();
			if ( false === strpos( $image_url, 'strip=all' ) && $this->get_option( $this->prefix . 'metadata_remove' ) ) {
				$more_args['strip'] = 'all';
			}
			if ( false === strpos( $image_url, 'lossy=' ) && ! $this->get_option( 'exactdn_lossy' ) ) {
				$more_args['lossy'] = 0;
			} elseif ( false === strpos( $image_url, 'lossy=' ) && $this->get_option( 'exactdn_lossy' ) ) {
				$more_args['lossy'] = is_numeric( $this->get_option( 'exactdn_lossy' ) ) ? (int) $this->get_option( 'exactdn_lossy' ) : 80;
			}
			if ( false === strpos( $image_url, 'quality=' ) && ! is_null( $jpg_quality ) && 82 !== (int) $jpg_quality ) {
				$more_args['quality'] = $jpg_quality;
			}
			// Merge given args with the automatic (option-based) args, and also makes sure args is an array if it was previously a string.
			$args = wp_parse_args( $args, $more_args );

			/**
			 * Filter the original image URL before it goes through ExactDN.
			 *
			 * @param string $image_url Image URL.
			 * @param array|string $args Array of ExactDN arguments.
			 * @param string|null $scheme Image scheme. Default to null.
			 */
			$image_url = apply_filters( 'exactdn_pre_image_url', $image_url, $args, $scheme );

			if ( empty( $image_url ) ) {
				return $image_url;
			}

			$image_url_parts = $this->parse_url( $image_url );

			// Unable to parse.
			if ( ! is_array( $image_url_parts ) || empty( $image_url_parts['host'] ) || empty( $image_url_parts['path'] ) ) {
				$this->debug_message( 'src url no good' );
				return $image_url;
			}

			if ( isset( $image_url_parts['scheme'] ) && 'https' === $image_url_parts['scheme'] ) {
				if ( is_array( $args ) ) {
					$args['ssl'] = 1;
				}
				$scheme = 'https';
			}

			/**
			 * Filter the ExactDN image parameters before they are applied to an image.
			 *
			 * @param array|string $args Array of ExactDN arguments.
			 * @param string $image_url Image URL.
			 * @param string|null $scheme Image scheme. Default to null.
			 */
			$args = apply_filters( 'exactdn_pre_args', $args, $image_url, $scheme );

			if ( is_array( $args ) ) {
				// Convert values that are arrays into strings.
				foreach ( $args as $arg => $value ) {
					if ( is_array( $value ) ) {
						$args[ $arg ] = implode( ',', $value );
					}
				}

				// Encode argument values.
				$args = rawurlencode_deep( $args );
			}

			$this->debug_message( $image_url_parts['host'] );

			// Figure out which CDN (sub)domain to use.
			if ( empty( $this->exactdn_domain ) ) {
				$this->debug_message( 'no exactdn domain configured' );
				return $image_url;
			}

			// You can't run an ExactDN URL through again because query strings are stripped.
			// So if the image is already an ExactDN URL, append the new arguments to the existing URL.
			if ( $this->exactdn_domain === $image_url_parts['host'] ) {
				$this->debug_message( 'url already has exactdn domain' );
				$exactdn_url = add_query_arg( $args, $image_url );
				return $this->url_scheme( $exactdn_url, $scheme );
			}

			// ExactDN doesn't support query strings so we ignore them and look only at the path.
			// However some source images are served via PHP so check the no-query-string extension.
			// For future proofing, this is a blacklist of common issues rather than a whitelist.
			$extension = pathinfo( $image_url_parts['path'], PATHINFO_EXTENSION );
			if ( ( empty( $extension ) && false === strpos( $image_url_parts['path'], 'nextgen-image/' ) ) || in_array( $extension, array( 'php', 'ashx' ), true ) ) {
				$this->debug_message( 'bad extension' );
				return $image_url;
			}

			if ( $this->remove_path && 0 === strpos( $image_url_parts['path'], $this->remove_path ) ) {
				$image_url_parts['path'] = substr( $image_url_parts['path'], strlen( $this->remove_path ) );
			}
			$domain      = 'http://' . $this->exactdn_domain . '/';
			$exactdn_url = $domain . ltrim( $image_url_parts['path'], '/' );
			$this->debug_message( "bare exactdn url: $exactdn_url" );

			/**
			 * Add query strings to ExactDN URL.
			 * By default, ExactDN doesn't support query strings so we ignore them.
			 * This setting is ExactDN Server dependent.
			 *
			 * @param bool false Should query strings be added to the image URL. Default is false.
			 * @param string $image_url_parts['host'] Image URL's host.
			 */
			if ( isset( $image_url_parts['query'] ) && apply_filters( 'exactdn_add_query_string_to_domain', false, $image_url_parts['host'] ) ) {
				$exactdn_url .= '?q=' . rawurlencode( $image_url_parts['query'] );
			}
			// This is disabled, as I don't think we really need it.
			if ( false && ! empty( $image_url_parts['query'] ) && false !== strpos( $image_url_parts['query'], 'theia_smart' ) ) {
				$args = wp_parse_args( $image_url_parts['query'], $args );
			}

			if ( $args ) {
				if ( is_array( $args ) ) {
					$exactdn_url = add_query_arg( $args, $exactdn_url );
				} else {
					// You can pass a query string for complicated requests, although this should have been converted to an array already.
					$exactdn_url .= '?' . $args;
				}
			}
			$this->debug_message( "exactdn url with args: $exactdn_url" );

			return $this->url_scheme( $exactdn_url, $scheme );
		}

		/**
		 * Prepends schemeless urls or replaces non-http scheme with a valid scheme, defaults to 'http'.
		 *
		 * @param string      $url The URL to parse.
		 * @param string|null $scheme Retrieve specific URL component.
		 * @return string Result of parse_url.
		 */
		function url_scheme( $url, $scheme ) {
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			if ( ! in_array( $scheme, array( 'http', 'https' ), true ) ) {
				$this->debug_message( 'not a valid scheme' );
				if ( preg_match( '#^(https?:)?//#', $url ) ) {
					$this->debug_message( 'url has a valid scheme already' );
					return $url;
				}
				$this->debug_message( 'invalid scheme provided, and url sucks, defaulting to http' );
				$scheme = 'http';
			}
			$this->debug_message( "valid $scheme - $url" );
			return preg_replace( '#^([a-z:]+)?//#i', "$scheme://", $url );
		}

		/**
		 * A wrapper for PHP's parse_url, prepending assumed scheme for network path
		 * URLs. PHP versions 5.4.6 and earlier do not correctly parse without scheme.
		 *
		 * @param string  $url The URL to parse.
		 * @param integer $component Retrieve specific URL component.
		 * @return mixed Result of parse_url.
		 */
		function parse_url( $url, $component = -1 ) {
			if ( 0 === strpos( $url, '//' ) ) {
				$url = ( is_ssl() ? 'https:' : 'http:' ) . $url;
			}
			if ( false === strpos( $url, 'http' ) && '/' !== substr( $url, 0, 1 ) ) {
				$url = ( is_ssl() ? 'https://' : 'http://' ) . $url;
			}
			// Because encoded ampersands in the filename break things.
			$url = str_replace( '&#038;', '&', $url );
			return parse_url( $url, $component );
		}

		/**
		 * A wrapper for human_time_diff() that gives sub-minute times in seconds.
		 *
		 * @param int $from Unix timestamp from which the difference begins.
		 * @param int $to Optional. Unix timestamp to end the time difference. Default is time().
		 * @return string Human readable time difference.
		 */
		function human_time_diff( $from, $to = '' ) {
			if ( empty( $to ) ) {
				$to = time();
			}
			$diff = (int) abs( $to - $from );
			if ( $diff < 60 ) {
				return "$diff sec";
			}
			return human_time_diff( $from, $to );
		}

		/**
		 * Adds link to header which enables DNS prefetching for faster speed.
		 *
		 * @param array  $hints A list of hints for a particular relationship type.
		 * @param string $relationship_type The type of hint being filtered: dns-prefetch, preconnect, etc.
		 * @return array The list of hints, potentially with the ExactDN domain added in.
		 */
		function dns_prefetch( $hints, $relationship_type ) {
			if ( 'dns-prefetch' === $relationship_type && $this->exactdn_domain ) {
				$hints[] = '//' . $this->exactdn_domain;
			}
			return $hints;
		}

		/**
		 * Adds the ExactDN domain to the list of 'local' domains for Autoptimize.
		 *
		 * @param array $domains A list of domains considered 'local' by Autoptimize.
		 * @return array The same list, with the ExactDN domain appended.
		 */
		function autoptimize_cdn_url( $domains ) {
			$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
			if ( is_array( $domains ) && ! in_array( $this->exactdn_domain, $domains, true ) ) {
				$this->debug_message( 'adding to AO list: ' . $this->exactdn_domain );
				$domains[] = $this->exactdn_domain;
			}
			return $domains;
		}
	}

	global $exactdn;
	$exactdn = new ExactDN();
}

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