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| 1 | <?php |
| 2 | /** |
| 3 | * Adds fallback behavior for non-Gutenframed sites to be able to use the 'Share Post' functionality from WPCOM Reader. |
| 4 | * |
| 5 | * @package share-post |
| 6 | */ |
| 7 | |
| 8 | /** |
| 9 | * Saves shared post data. |
| 10 | * |
| 11 | * @param int $target_post_id Post ID. |
| 12 | * @param ?WP_Post $post Post object. |
| 13 | * @param bool $update Whether this is an update. |
| 14 | * |
| 15 | * @return int|void|WP_Error |
| 16 | */ |
| 17 | function wpcomsh_insert_shared_post_data( $target_post_id, $post = null, $update = false ) { |
| 18 | |
| 19 | // There are cases when plugins trigger insert hooks without arguments, we just return in this case. |
| 20 | if ( null === $post ) { |
| 21 | return $target_post_id; |
| 22 | } |
| 23 | |
| 24 | // This `$update` check avoids infinite loops of trying to update our updated post. |
| 25 | if ( $update ) { |
| 26 | return; |
| 27 | } |
| 28 | |
| 29 | // Abort this function if we are not in a post sharing context. |
| 30 | $is_post_share = isset( $_GET['is_post_share'] ) && $_GET['is_post_share']; // phpcs:ignore WordPress.Security |
| 31 | if ( ! $is_post_share ) { |
| 32 | return; |
| 33 | } |
| 34 | |
| 35 | $title = wpcomsh_get_shared_post_arg( 'title' ); |
| 36 | $image = wpcomsh_get_shared_post_arg( 'image' ); |
| 37 | $text = wpcomsh_get_shared_post_arg( 'text' ); |
| 38 | $url = wpcomsh_get_shared_post_arg( 'url' ); |
| 39 | $embed = strtok( wpcomsh_get_shared_post_arg( 'embed' ), '?' ); |
| 40 | $link = sprintf( |
| 41 | '<a href="%1$s">%2$s</a>', |
| 42 | esc_url( $url ), |
| 43 | sanitize_text_field( $title ) |
| 44 | ); |
| 45 | $content = ''; |
| 46 | |
| 47 | if ( $embed ) { |
| 48 | $content .= wpcomsh_get_embed_content( $embed ); |
| 49 | } |
| 50 | |
| 51 | if ( $image ) { |
| 52 | $content .= wpcomsh_get_image_content( $image, $text, $link ); |
| 53 | } |
| 54 | |
| 55 | if ( $text ) { |
| 56 | $content .= wpcomsh_get_text_content( $text, $link ); |
| 57 | } |
| 58 | |
| 59 | $data = array( |
| 60 | 'ID' => $target_post_id, |
| 61 | 'post_title' => $title, |
| 62 | 'post_content' => $content, |
| 63 | ); |
| 64 | |
| 65 | // Required to satisfy get_default_post_to_edit(), which has these filters after post creation. |
| 66 | add_filter( 'default_title', 'wpcomsh_filter_title', 10, 2 ); |
| 67 | add_filter( 'default_content', 'wpcomsh_filter_content', 10, 2 ); |
| 68 | |
| 69 | return wp_update_post( wp_slash( $data ) ); |
| 70 | } |
| 71 | add_action( 'wp_insert_post', 'wpcomsh_insert_shared_post_data', 10, 3 ); |
| 72 | |
| 73 | /** |
| 74 | * Get an argument from the share link. |
| 75 | * |
| 76 | * @param string $key Query argument name. |
| 77 | * @return string Unslashed, unescaped value, or an empty string when absent. |
| 78 | */ |
| 79 | function wpcomsh_get_shared_post_arg( $key ) { |
| 80 | // phpcs:ignore WordPress.Security -- Values are escaped where they are used. |
| 81 | return isset( $_GET[ $key ] ) && is_string( $_GET[ $key ] ) ? wp_unslash( $_GET[ $key ] ) : ''; |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * Generate the embed content for our sharing post. |
| 86 | * |
| 87 | * @param string $embed URL of our embed. |
| 88 | * @return string Generated content for the sharing post. |
| 89 | */ |
| 90 | function wpcomsh_get_embed_content( $embed ) { |
| 91 | $url = esc_url_raw( wp_check_invalid_utf8( $embed ) ); |
| 92 | if ( '' === $url ) { |
| 93 | return ''; |
| 94 | } |
| 95 | |
| 96 | // Matches the core/embed block's save() output, so the editor validates it. |
| 97 | return get_comment_delimited_block_content( |
| 98 | 'core/embed', |
| 99 | array( 'url' => $url ), |
| 100 | sprintf( |
| 101 | '<figure class="wp-block-embed"><div class="wp-block-embed__wrapper">%s</div></figure>', |
| 102 | "\n" . htmlspecialchars( $url, ENT_QUOTES, 'UTF-8', true ) . "\n" |
| 103 | ) |
| 104 | ); |
| 105 | } |
| 106 | |
| 107 | /** |
| 108 | * Generate the image content for our sharing post. |
| 109 | * |
| 110 | * @param string $image URL of our image. |
| 111 | * @param string $text Content of the shared post. |
| 112 | * @param string $link Permalink to the shared post. |
| 113 | * @return string Generated content for the sharing post. |
| 114 | */ |
| 115 | function wpcomsh_get_image_content( $image, $text, $link ) { |
| 116 | return sprintf( |
| 117 | '<!-- wp:image --><figure class="wp-block-image"><img src="%1$s" alt=""/>%2$s</figure><!-- /wp:image -->', |
| 118 | esc_url( $image ), |
| 119 | empty( $text ) ? '<figcaption>' . $link . '</figcaption>' : null // $link is escaped on initialization |
| 120 | ); |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * Generate the text content for our sharing post. |
| 125 | * |
| 126 | * @param string $text Content of the shared post. |
| 127 | * @param string $link Permalink to the shared post. |
| 128 | * @return string Generated content for the sharing post. |
| 129 | */ |
| 130 | function wpcomsh_get_text_content( $text, $link ) { |
| 131 | return sprintf( |
| 132 | '<!-- wp:quote --><blockquote class="wp-block-quote"><p>%1$s</p><cite>%2$s</cite></blockquote><!-- /wp:quote -->', |
| 133 | wp_kses_post( $text ), |
| 134 | $link // Escaped on initialization. |
| 135 | ); |
| 136 | } |
| 137 | |
| 138 | /** |
| 139 | * Update the target post's title. |
| 140 | * |
| 141 | * @param string $post_title Post title determined by `get_default_post_to_edit()`. |
| 142 | * @param WP_Post $post Post object of newly-inserted post. |
| 143 | * @return string Updated post title from source post. |
| 144 | */ |
| 145 | function wpcomsh_filter_title( $post_title, $post ) { |
| 146 | return $post->post_title; |
| 147 | } |
| 148 | |
| 149 | /** |
| 150 | * Update the target post's content (`post_content`). |
| 151 | * |
| 152 | * @param string $post_content Post content determined by `get_default_post_to_edit()`. |
| 153 | * @param WP_Post $post Post object of newly-inserted post. |
| 154 | * @return string Updated post content from source post. |
| 155 | */ |
| 156 | function wpcomsh_filter_content( $post_content, $post ) { |
| 157 | return $post->post_content; |
| 158 | } |