<?php

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use AdvancedAds\Utilities\WordPress;

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/**

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* Injects ads in the content based on an XPath expression.

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*/

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class Advanced_Ads_In_Content_Injector {

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/**

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* Gather placeholders which later are replaced by the ads

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*

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* @var array $ads_for_placeholders

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*/

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private static $ads_for_placeholders = [];

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/**

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* Inject ads directly into the content

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*

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* @param string $placement_id Id of the placement.

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* @param array $placement_opts Placement options.

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* @param string $content Content to inject placement into.

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* @param array $options {

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* Injection options.

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*

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* @type bool $allowEmpty Whether the tag can be empty to be counted.

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* @type bool $paragraph_select_from_bottom Whether to select ads from buttom.

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* @type string $position Position. Can be one of 'before', 'after', 'append', 'prepend'

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* @type number $alter_nodes Whether to alter nodes, for example to prevent injecting ads into `a` tags.

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* @type bool $repeat Whether to repeat the position.

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* @type number $paragraph_id Paragraph Id.

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* @type number $itemLimit If there are too few items at this level test nesting. Set to '-1` to prevent testing.

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* }

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*

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* @return string $content Content with injected placement.

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*/

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public static function &inject_in_content( $placement_id, $placement_opts, &$content, $options = [] ) {

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if ( ! extension_loaded( 'dom' ) ) {

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return $content;

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}

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// phpcs:disable WordPress.NamingConventions.ValidVariableName.UsedPropertyNotSnakeCase

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// phpcs:disable WordPress.NamingConventions.ValidVariableName.VariableNotSnakeCase

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// parse arguments.

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$tag = isset( $placement_opts['tag'] ) ? $placement_opts['tag'] : 'p';

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$tag = preg_replace( '/[^a-z0-9]/i', '', $tag ); // simplify tag.

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/**

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* Store the original tag value since $tag is changed on the fly and we might want to know the original selected

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* options for some checks later.

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*/

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$tag_option = $tag;

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// allow more complex xPath expression.

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$tag = apply_filters( 'advanced-ads-placement-content-injection-xpath', $tag, $placement_opts );

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// get plugin options.

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$plugin_options = Advanced_Ads::get_instance()->options();

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$defaults = [

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'allowEmpty' => false,

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'paragraph_select_from_bottom' => isset( $placement_opts['start_from_bottom'] ) && $placement_opts['start_from_bottom'],

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'position' => isset( $placement_opts['position'] ) ? $placement_opts['position'] : 'after',

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// only has before and after.

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'before' => isset( $placement_opts['position'] ) && 'before' === $placement_opts['position'],

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// Whether to alter nodes, for example to prevent injecting ads into `a` tags.

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'alter_nodes' => true,

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'repeat' => false,

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];

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$defaults['paragraph_id'] = isset( $placement_opts['index'] ) ? $placement_opts['index'] : 1;

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$defaults['paragraph_id'] = max( 1, (int) $defaults['paragraph_id'] );

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// if there are too few items at this level test nesting.

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$defaults['itemLimit'] = 'p' === $tag_option ? 2 : 1;

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// trigger such a high item limit that all elements will be considered.

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if ( ! empty( $plugin_options['content-injection-level-disabled'] ) ) {

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$defaults['itemLimit'] = 1000;

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}

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// handle tags that are empty by definition or could be empty ("custom" option)

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if ( in_array( $tag_option, [ 'img', 'iframe', 'custom' ], true ) ) {

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$defaults['allowEmpty'] = true;

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}

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// allow hooks to change some options.

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$options = apply_filters(

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'advanced-ads-placement-content-injection-options',

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wp_parse_args( $options, $defaults ),

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$tag_option

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);

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$wp_charset = get_bloginfo( 'charset' );

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// parse document as DOM (fragment - having only a part of an actual post given).

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$content_to_load = self::get_content_to_load( $content, $wp_charset );

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if ( ! $content_to_load ) {

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return $content;

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}

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$dom = new DOMDocument( '1.0', $wp_charset );

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// may loose some fragments or add autop-like code.

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$libxml_use_internal_errors = libxml_use_internal_errors( true ); // avoid notices and warnings - html is most likely malformed.

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$success = $dom->loadHtml( '<!DOCTYPE html><html><meta http-equiv="Content-Type" content="text/html; charset=' . $wp_charset . '" /><body>' . $content_to_load );

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libxml_use_internal_errors( $libxml_use_internal_errors );

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if ( true !== $success ) {

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// -TODO handle cases were dom-parsing failed (at least inform user)

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return $content;

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}

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/**

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* Handle advanced tags.

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*/

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switch ( $tag_option ) {

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case 'p':

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// exclude paragraphs within blockquote tags

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$tag = 'p[not(parent::blockquote)]';

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break;

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case 'pwithoutimg':

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// convert option name into correct path, exclude paragraphs within blockquote tags

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$tag = 'p[not(descendant::img) and not(parent::blockquote)]';

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break;

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case 'img':

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/*

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* Handle: 1) "img" tags 2) "image" block 3) "gallery" block 4) "gallery shortcode" 5) "wp_caption" shortcode

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* Handle the gallery created by the block or the shortcode as one image.

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* Prevent injection of ads next to images in tables.

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*/

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// Default shortcodes, including non-HTML5 versions.

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$shortcodes = "@class and (

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contains(concat(' ', normalize-space(@class), ' '), ' gallery-size') or

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contains(concat(' ', normalize-space(@class), ' '), ' wp-caption ') )";

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$tag = "*[self::img or self::figure or self::div[$shortcodes]]

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[not(ancestor::table or ancestor::figure or ancestor::div[$shortcodes])]";

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break;

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// any headline. By default h2, h3, and h4

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case 'headlines':

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$headlines = apply_filters( 'advanced-ads-headlines-for-ad-injection', [ 'h2', 'h3', 'h4' ] );

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foreach ( $headlines as &$headline ) {

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$headline = 'self::' . $headline;

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}

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$tag = '*[' . implode( ' or ', $headlines ) . ']'; // /html/body/*[self::h2 or self::h3 or self::h4]

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break;

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// any HTML element that makes sense in the content

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case 'anyelement':

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$exclude = [

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'html',

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'body',

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'script',

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'style',

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'tr',

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'td',

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// Inline tags.

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'a',

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'abbr',

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'b',

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'bdo',

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'br',

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'button',

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'cite',

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'code',

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'dfn',

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'em',

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'i',

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'img',

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'kbd',

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'label',

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'option',

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'q',

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'samp',

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'select',

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'small',

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'span',

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'strong',

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'sub',

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'sup',

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'textarea',

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'time',

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'tt',

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'var',

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];

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$tag = '*[not(self::' . implode( ' or self::', $exclude ) . ')]';

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break;

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case 'custom':

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// get the path for the "custom" tag choice, use p as a fallback to prevent it from showing any ads if users left it empty

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$tag = ! empty( $placement_opts['xpath'] ) ? stripslashes( $placement_opts['xpath'] ) : 'p';

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break;

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}

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// select positions.

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$xpath = new DOMXPath( $dom );

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if ( $options['itemLimit'] !== -1 ) {

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$items = $xpath->query( '/html/body/' . $tag );

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if ( $items->length < $options['itemLimit'] ) {

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$items = $xpath->query( '/html/body/*/' . $tag );

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}

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// try third level.

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if ( $items->length < $options['itemLimit'] ) {

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$items = $xpath->query( '/html/body/*/*/' . $tag );

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}

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// try all levels as last resort.

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if ( $items->length < $options['itemLimit'] ) {

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$items = $xpath->query( '//' . $tag );

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}

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} else {

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$items = $xpath->query( $tag );

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}

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// allow to select other elements.

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$items = apply_filters( 'advanced-ads-placement-content-injection-items', $items, $xpath, $tag_option );

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// filter empty tags from items.

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$whitespaces = json_decode( '"\t\n\r \u00A0"' );

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$paragraphs = [];

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foreach ( $items as $item ) {

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if ( $options['allowEmpty'] || ( isset( $item->textContent ) && trim( $item->textContent, $whitespaces ) !== '' ) ) { // phpcs:ignore WordPress.NamingConventions.ValidVariableName.NotSnakeCaseMemberVar

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$paragraphs[] = $item;

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}

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}

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$ancestors_to_limit = self::get_ancestors_to_limit( $xpath );

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$paragraphs = self::filter_by_ancestors_to_limit( $paragraphs, $ancestors_to_limit );

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$options['paragraph_count'] = count( $paragraphs );

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if ( $options['paragraph_count'] >= $options['paragraph_id'] ) {

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$offset = $options['paragraph_select_from_bottom'] ? $options['paragraph_count'] - $options['paragraph_id'] : $options['paragraph_id'] - 1;

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$offsets = apply_filters( 'advanced-ads-placement-content-offsets', [ $offset ], $options, $placement_opts, $xpath, $paragraphs, $dom );

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$did_inject = false;

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foreach ( $offsets as $offset ) {

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// inject.

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$node = apply_filters( 'advanced-ads-placement-content-injection-node', $paragraphs[ $offset ], $tag, $options['before'] );

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if ( $options['alter_nodes'] ) {

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// Prevent injection into image caption and gallery.

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$parent = $node;

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for ( $i = 0; $i < 4; $i++ ) {

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$parent = $parent->parentNode;

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if ( ! $parent instanceof DOMElement ) {

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break;

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}

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if ( preg_match( '/\b(wp-caption|gallery-size)\b/', $parent->getAttribute( 'class' ) ) ) {

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$node = $parent;

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break;

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}

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}

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// make sure that the ad is injected outside the link

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if ( 'img' === $tag_option && 'a' === $node->parentNode->tagName ) {

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if ( $options['before'] ) {

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$node->parentNode;

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} else {

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// go one level deeper if inserted after to not insert the ad into the link; probably after the paragraph

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$node->parentNode->parentNode;

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}

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}

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}

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$ad_content = (string) Advanced_Ads_Select::get_instance()->get_ad_by_method( $placement_id, 'placement', $placement_opts );

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if ( trim( $ad_content, $whitespaces ) === '' ) {

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continue;

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}

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// phpcs:ignore WordPress.NamingConventions.ValidVariableName.NotSnakeCaseMemberVar

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$ad_content = self::filter_ad_content( $ad_content, $node->tagName, $options );

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// convert HTML to XML!

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$ad_dom = new DOMDocument( '1.0', $wp_charset );

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$libxml_use_internal_errors = libxml_use_internal_errors( true );

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$ad_dom->loadHtml( '<!DOCTYPE html><html><meta http-equiv="Content-Type" content="text/html; charset=' . $wp_charset . '" /><body>' . $ad_content );

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switch ( $options['position'] ) {

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case 'append':

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$ref_node = $node;

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foreach ( $ad_dom->getElementsByTagName( 'body' )->item( 0 )->childNodes as $importedNode ) {

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$importedNode = $dom->importNode( $importedNode, true );

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$ref_node->appendChild( $importedNode );

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}

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break;

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case 'prepend':

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$ref_node = $node;

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foreach ( $ad_dom->getElementsByTagName( 'body' )->item( 0 )->childNodes as $importedNode ) {

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$importedNode = $dom->importNode( $importedNode, true );

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$ref_node->insertBefore( $importedNode, $ref_node->firstChild );

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}

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break;

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case 'before':

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$ref_node = $node;

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foreach ( $ad_dom->getElementsByTagName( 'body' )->item( 0 )->childNodes as $importedNode ) {

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$importedNode = $dom->importNode( $importedNode, true );

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$ref_node->parentNode->insertBefore( $importedNode, $ref_node );

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}

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break;

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case 'after':

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default:

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// append before next node or as last child to body.

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$ref_node = $node->nextSibling;

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if ( isset( $ref_node ) ) {

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foreach ( $ad_dom->getElementsByTagName( 'body' )->item( 0 )->childNodes as $importedNode ) {

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$importedNode = $dom->importNode( $importedNode, true );

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$ref_node->parentNode->insertBefore( $importedNode, $ref_node );

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}

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} else {

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// append to body; -TODO using here that we only select direct children of the body tag.

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foreach ( $ad_dom->getElementsByTagName( 'body' )->item( 0 )->childNodes as $importedNode ) {

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$importedNode = $dom->importNode( $importedNode, true );

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$node->parentNode->appendChild( $importedNode );

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}

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}

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}

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libxml_use_internal_errors( $libxml_use_internal_errors );

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$did_inject = true;

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}

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if ( ! $did_inject ) {

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return $content;

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}

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$content_orig = $content;

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// convert to text-representation.

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$content = $dom->saveHTML();

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$content = self::prepare_output( $content, $content_orig );

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/**

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* Show a warning to ad admins in the Ad Health bar in the frontend, when

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*

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* * the level limitation was not disabled

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* * could not inject one ad (as by use of `elseif` here)

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* * but there are enough elements on the site, but just in sub-containers

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*/

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} elseif ( WordPress::user_can( 'advanced_ads_manage_options' )

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&& $options['itemLimit'] !== -1

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&& empty( $plugin_options['content-injection-level-disabled'] ) ) {

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// Check if there are more elements without limitation.

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$all_items = $xpath->query( '//' . $tag );

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$paragraphs = [];

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foreach ( $all_items as $item ) {

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if ( $options['allowEmpty'] || ( isset( $item->textContent ) && trim( $item->textContent, $whitespaces ) !== '' ) ) { // phpcs:ignore WordPress.NamingConventions.ValidVariableName.NotSnakeCaseMemberVar

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$paragraphs[] = $item;

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}

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}

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$paragraphs = self::filter_by_ancestors_to_limit( $paragraphs, $ancestors_to_limit );

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if ( $options['paragraph_id'] <= count( $paragraphs ) ) {

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// Add a warning to ad health.

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add_filter( 'advanced-ads-ad-health-nodes', [ 'Advanced_Ads_In_Content_Injector', 'add_ad_health_node' ] );

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}

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}

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// phpcs:enable

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return $content;

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}

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/**

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* Get content to load.

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*

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* @param string $content Original content.

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* @param string $wp_charset blog charset.

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*

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* @return string $content Content to load.

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*/

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private static function get_content_to_load( $content, $wp_charset ) {

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// Prevent removing closing tags in scripts.

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$content_to_load = preg_replace( '/<script.*?<\/script>/si', '<!--\0-->', $content );

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// check which priority the wpautop filter has; might have been disabled on purpose.

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$wpautop_priority = has_filter( 'the_content', 'wpautop' );

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if ( $wpautop_priority && Advanced_Ads_Plugin::get_instance()->get_content_injection_priority() < $wpautop_priority ) {

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$content_to_load = wpautop( $content_to_load );

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}

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return $content_to_load;

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}

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/**

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* Filter ad content.

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*

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* @param string $ad_content Ad content.

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* @param string $tag_name tar before/after the content.

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* @param array $options Injection options.

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*

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* @return string ad content.

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*/

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private static function filter_ad_content( $ad_content, $tag_name, $options ) {

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// Replace `</` with `<\/` in ad content when placed within `document.write()` to prevent code from breaking.

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$ad_content = preg_replace( '#(document.write.+)</(.*)#', '$1<\/$2', $ad_content );

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// Inject placeholder.

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$id = count( self::$ads_for_placeholders );

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self::$ads_for_placeholders[] = [

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'id' => $id,

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'tag' => $tag_name,

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'position' => $options['position'],

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'ad' => $ad_content,

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];

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return '%advads_placeholder_' . $id . '%';

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}

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/**

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* Prepare output.

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*

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* @param string $content Modified content.

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* @param string $content_orig Original content.

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*

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* @return string $content Content to output.

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*/

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private static function prepare_output( $content, $content_orig ) {

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$content = self::inject_ads( $content, $content_orig, self::$ads_for_placeholders );

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self::$ads_for_placeholders = [];

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return $content;

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}

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/**

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* Search for ad placeholders in the `$content` to determine positions at which to inject ads.

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* Given the positions, inject ads into `$content_orig.

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*

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* @param string $content Post content with injected ad placeholders.

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* @param string $content_orig Unmodified post content.

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* @param array $ads_for_placeholders Array of ads.

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* Each ad contains placeholder id, before or after which tag to inject the ad, the ad content.

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*

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* @return string $content

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*/

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private static function inject_ads( $content, $content_orig, $ads_for_placeholders ) {

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$self_closing_tags = [

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'area',

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'base',

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'basefont',

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'bgsound',

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'br',

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'col',

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'embed',

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'frame',

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'hr',

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'img',

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'input',

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'keygen',

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'link',

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'meta',

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'param',

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'source',

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'track',

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'wbr',

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];

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// It is not possible to append/prepend in self closing tags.

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foreach ( $ads_for_placeholders as &$ad_content ) {

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if ( ( 'prepend' === $ad_content['position'] || 'append' === $ad_content['position'] )

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&& in_array( $ad_content['tag'], $self_closing_tags, true ) ) {

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$ad_content['position'] = 'after';

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}

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}

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unset( $ad_content );

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usort( $ads_for_placeholders, [ 'Advanced_Ads_In_Content_Injector', 'sort_ads_for_placehoders' ] );

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// Add tags before/after which ad placehoders were injected.

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foreach ( $ads_for_placeholders as $ad_content ) {

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$tag = $ad_content['tag'];

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switch ( $ad_content['position'] ) {

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case 'before':

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case 'prepend':

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$alts[] = "<{$tag}[^>]*>";

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break;

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case 'after':

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if ( in_array( $tag, $self_closing_tags, true ) ) {

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$alts[] = "<{$tag}[^>]*>";

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} else {

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$alts[] = "</{$tag}>";

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}

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break;

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case 'append':

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$alts[] = "</{$tag}>";

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break;

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}

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}

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$alts = array_unique( $alts );

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$tag_regexp = implode( '|', $alts );

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// Add ad placeholder.

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$alts[] = '%advads_placeholder_(?:\d+)%';

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$tag_and_placeholder_regexp = implode( '|', $alts );

[497] Fix | Delete

[498] Fix | Delete

preg_match_all( "#{$tag_and_placeholder_regexp}#i", $content, $tag_matches );

[499] Fix | Delete