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| 1 | <?php |
| 2 | /** |
| 3 | * Whether a post's body is withheld from the public by a content gate. |
| 4 | * |
| 5 | * @package automattic/jetpack-seo-package |
| 6 | */ |
| 7 | |
| 8 | namespace Automattic\Jetpack\SEO; |
| 9 | |
| 10 | /** |
| 11 | * Whether a post's body is withheld from an anonymous reader. |
| 12 | * |
| 13 | * Crawler-facing surfaces (meta descriptions, Open Graph tags, JSON-LD, llms.txt) |
| 14 | * read the raw `post_content` column, so they never pass through the `the_content` |
| 15 | * chain where the subscriptions paywall is installed and must ask this themselves. |
| 16 | * |
| 17 | * Visitor-independent by design: those surfaces are cached and shared, so their |
| 18 | * output must not vary by who fetched them. |
| 19 | * |
| 20 | * @since 0.9.2 |
| 21 | */ |
| 22 | class Content_Gate { |
| 23 | |
| 24 | /** |
| 25 | * Post meta set when a post contains paid content. |
| 26 | * |
| 27 | * @var string |
| 28 | */ |
| 29 | const META_CONTAINS_PAID_CONTENT = '_jetpack_memberships_contains_paid_content'; |
| 30 | |
| 31 | /** |
| 32 | * Post meta set when a post contains paywalled content. |
| 33 | * |
| 34 | * @var string |
| 35 | */ |
| 36 | const META_CONTAINS_PAYWALLED_CONTENT = '_jetpack_memberships_contains_paywalled_content'; |
| 37 | |
| 38 | /** |
| 39 | * Post meta holding the post-level Newsletter access setting. |
| 40 | * |
| 41 | * @var string |
| 42 | */ |
| 43 | const META_NEWSLETTER_ACCESS = '_jetpack_newsletter_access'; |
| 44 | |
| 45 | /** |
| 46 | * The access level that means "no gate". |
| 47 | * |
| 48 | * @var string |
| 49 | */ |
| 50 | const ACCESS_LEVEL_EVERYBODY = 'everybody'; |
| 51 | |
| 52 | /** |
| 53 | * The block that splits a post into a public teaser and a gated body. |
| 54 | * |
| 55 | * @var string |
| 56 | */ |
| 57 | const BLOCK_PAYWALL = 'jetpack/paywall'; |
| 58 | |
| 59 | /** |
| 60 | * The namespace whose blocks hide their own content at render time. |
| 61 | * |
| 62 | * @var string |
| 63 | */ |
| 64 | const BLOCK_NAMESPACE_PREMIUM_CONTENT = 'premium-content'; |
| 65 | |
| 66 | /** |
| 67 | * The block that wraps gated content. |
| 68 | * |
| 69 | * @var string |
| 70 | */ |
| 71 | const BLOCK_PREMIUM_CONTENT = self::BLOCK_NAMESPACE_PREMIUM_CONTENT . '/container'; |
| 72 | |
| 73 | /** |
| 74 | * Whether this post's body is withheld from an anonymous reader. |
| 75 | * |
| 76 | * Any Newsletter access level other than "everybody" counts as gated, even one |
| 77 | * the front end would not enforce (an unknown value, or the Subscriptions |
| 78 | * module switched off after the level was set). Erring that way withholds a |
| 79 | * summary; erring the other way publishes a paywalled body. |
| 80 | * |
| 81 | * @since 0.9.2 |
| 82 | * |
| 83 | * @param \WP_Post|int|null $post Post, post ID, or null for the global post. |
| 84 | * @return bool True when the body must not be published. |
| 85 | */ |
| 86 | public static function is_gated( $post = null ) { |
| 87 | // A WP_Post is taken as given: get_post() would re-query it by ID. |
| 88 | $post = $post instanceof \WP_Post ? $post : get_post( $post ); |
| 89 | |
| 90 | if ( ! $post instanceof \WP_Post ) { |
| 91 | return true; |
| 92 | } |
| 93 | |
| 94 | if ( ! empty( $post->post_password ) ) { |
| 95 | return true; |
| 96 | } |
| 97 | |
| 98 | if ( |
| 99 | get_post_meta( $post->ID, self::META_CONTAINS_PAID_CONTENT, true ) |
| 100 | || get_post_meta( $post->ID, self::META_CONTAINS_PAYWALLED_CONTENT, true ) |
| 101 | || has_block( self::BLOCK_PREMIUM_CONTENT, $post ) |
| 102 | || has_block( self::BLOCK_PAYWALL, $post ) |
| 103 | ) { |
| 104 | return true; |
| 105 | } |
| 106 | |
| 107 | return self::ACCESS_LEVEL_EVERYBODY !== self::access_level( $post->ID ); |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * The part of a gated post's body that is published to everyone anyway. |
| 112 | * |
| 113 | * A `jetpack/paywall` post serves everything above the block to anonymous |
| 114 | * readers, but only because `do_blocks()` then renders that prefix: a |
| 115 | * `premium-content` block inside it hides itself, which raw markup does not. |
| 116 | * |
| 117 | * @since 0.9.2 |
| 118 | * |
| 119 | * @param \WP_Post|int|null $post Post, post ID, or null for the global post. |
| 120 | * @return string Public teaser, or '' when no part of the body is public. |
| 121 | */ |
| 122 | public static function public_teaser( $post = null ) { |
| 123 | $post = $post instanceof \WP_Post ? $post : get_post( $post ); |
| 124 | |
| 125 | if ( ! $post instanceof \WP_Post || ! empty( $post->post_password ) ) { |
| 126 | return ''; |
| 127 | } |
| 128 | |
| 129 | // Split on the same delimiter the subscriptions paywall splits on, so the |
| 130 | // teaser we summarize is the one the front end actually serves. |
| 131 | $delimiter = '<!-- wp:' . self::BLOCK_PAYWALL . ' /-->'; |
| 132 | if ( ! str_contains( $post->post_content, $delimiter ) ) { |
| 133 | return ''; |
| 134 | } |
| 135 | |
| 136 | $teaser = strstr( $post->post_content, $delimiter, true ); |
| 137 | |
| 138 | // Callers summarize this without rendering it, so a block that withholds |
| 139 | // its own content at render time would publish here as plain text. |
| 140 | if ( str_contains( $teaser, '<!-- wp:' . self::BLOCK_NAMESPACE_PREMIUM_CONTENT . '/' ) ) { |
| 141 | return ''; |
| 142 | } |
| 143 | |
| 144 | return $teaser; |
| 145 | } |
| 146 | |
| 147 | /** |
| 148 | * The post's Newsletter access level. |
| 149 | * |
| 150 | * Unset and non-string values read as "everybody", as the front end treats |
| 151 | * them, so a post the site renders in full keeps its summary. |
| 152 | * |
| 153 | * @param int $post_id Post ID. |
| 154 | * @return string |
| 155 | */ |
| 156 | private static function access_level( $post_id ) { |
| 157 | $access_level = get_post_meta( $post_id, self::META_NEWSLETTER_ACCESS, true ); |
| 158 | |
| 159 | if ( empty( $access_level ) || ! is_string( $access_level ) ) { |
| 160 | return self::ACCESS_LEVEL_EVERYBODY; |
| 161 | } |
| 162 | |
| 163 | return $access_level; |
| 164 | } |
| 165 | } |