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| 1 | <?php |
| 2 | /** |
| 3 | * Avatars for comments already written. |
| 4 | * |
| 5 | * @package automattic/jetpack-comments |
| 6 | */ |
| 7 | |
| 8 | namespace Automattic\Jetpack\Comments; |
| 9 | |
| 10 | use Automattic\Jetpack\Image_CDN\Image_CDN_Core; |
| 11 | |
| 12 | /** |
| 13 | * Avatars WordPress cannot derive from an email address. |
| 14 | */ |
| 15 | class Avatars { |
| 16 | |
| 17 | /** |
| 18 | * Register the avatar filters. |
| 19 | * |
| 20 | * @return void |
| 21 | */ |
| 22 | public static function init() { |
| 23 | add_filter( 'pre_get_avatar_data', array( __CLASS__, 'avatar_data' ), 10, 2 ); |
| 24 | // WordPress.com replaces get_avatar() with its own, which never reaches pre_get_avatar_data. |
| 25 | add_filter( 'wpcom_get_avatar_url', array( __CLASS__, 'wpcom_avatar_url' ), 10, 6 ); |
| 26 | } |
| 27 | |
| 28 | /** |
| 29 | * Serve a stored avatar for comments that carry one. |
| 30 | * |
| 31 | * @param array $args Avatar arguments. |
| 32 | * @param mixed $id_or_email What the avatar was requested for. |
| 33 | * @return array |
| 34 | */ |
| 35 | public static function avatar_data( $args, $id_or_email ) { |
| 36 | if ( ! $id_or_email instanceof \WP_Comment || isset( $args['url'] ) ) { |
| 37 | return $args; |
| 38 | } |
| 39 | |
| 40 | $url = self::stored_url( (int) $id_or_email->comment_ID, isset( $args['size'] ) ? (int) $args['size'] : 96 ); |
| 41 | |
| 42 | if ( null !== $url ) { |
| 43 | $args['url'] = $url; |
| 44 | $args['found_avatar'] = true; |
| 45 | } elseif ( self::is_signed_in( (int) $id_or_email->comment_ID ) ) { |
| 46 | // WordPress.com had no photo: the site default, not a Gravatar the commenter never chose. |
| 47 | $args['force_default'] = true; |
| 48 | } |
| 49 | |
| 50 | return $args; |
| 51 | } |
| 52 | |
| 53 | /** |
| 54 | * Serve a stored avatar on WordPress.com. |
| 55 | * |
| 56 | * @param array|false $url_class Avatar URL and CSS class, or false. |
| 57 | * @param mixed $id_or_email What the avatar was requested for. |
| 58 | * @param int|string $size Avatar size. |
| 59 | * @param string $default_value Default avatar. Unused. |
| 60 | * @param bool $force_display Whether to show avatars when disabled. Unused. |
| 61 | * @param bool $force_default Whether to force the default avatar. |
| 62 | * @return array|false |
| 63 | */ |
| 64 | public static function wpcom_avatar_url( $url_class, $id_or_email, $size = 96, $default_value = '', $force_display = false, $force_default = false ) { |
| 65 | if ( $force_default || ! is_array( $url_class ) || ! is_object( $id_or_email ) || empty( $id_or_email->comment_ID ) ) { |
| 66 | return $url_class; |
| 67 | } |
| 68 | |
| 69 | $url = self::stored_url( (int) $id_or_email->comment_ID, (int) $size ); |
| 70 | |
| 71 | if ( null !== $url ) { |
| 72 | $url_class[0] = $url; |
| 73 | } elseif ( self::is_signed_in( (int) $id_or_email->comment_ID ) ) { |
| 74 | $url_class[0] = self::default_url( (int) $size ); |
| 75 | $url_class[1] = ( isset( $url_class[1] ) ? $url_class[1] . ' ' : '' ) . 'avatar-default'; |
| 76 | } |
| 77 | |
| 78 | return $url_class; |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * The site's default avatar, resolved the way the host resolves it. |
| 83 | * |
| 84 | * @param int $size Avatar size. |
| 85 | * @return string |
| 86 | */ |
| 87 | public static function default_url( $size ) { |
| 88 | if ( function_exists( 'wpcom_get_avatar_url' ) ) { |
| 89 | // Re-enters wpcom_avatar_url() with no comment, so it returns early there. |
| 90 | $url_class = wpcom_get_avatar_url( '', $size, '', false, true ); |
| 91 | |
| 92 | // Built for HTML, so its query string is joined with &, which Gravatar reads as a parameter named amp;d. |
| 93 | return is_array( $url_class ) ? html_entity_decode( (string) $url_class[0], ENT_QUOTES ) : ''; |
| 94 | } |
| 95 | |
| 96 | return (string) get_avatar_url( |
| 97 | '', |
| 98 | array( |
| 99 | 'size' => $size, |
| 100 | 'force_default' => true, |
| 101 | ) |
| 102 | ); |
| 103 | } |
| 104 | |
| 105 | /** |
| 106 | * Whether the comment was left through a popup sign-in. |
| 107 | * |
| 108 | * @param int $comment_id The comment ID. |
| 109 | * @return bool |
| 110 | */ |
| 111 | private static function is_signed_in( $comment_id ) { |
| 112 | return '' !== (string) get_comment_meta( $comment_id, Checkpoint::META_ID, true ); |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * The stored avatar for a comment, sized through the image CDN. |
| 117 | * |
| 118 | * @param int $comment_id The comment ID. |
| 119 | * @param int $size Avatar size. |
| 120 | * @return string|null Null when the comment carries no servable avatar. |
| 121 | */ |
| 122 | private static function stored_url( $comment_id, $size ) { |
| 123 | // WordPress.com asks twice per comment, through get_avatar_data() and again through wpcom_get_avatar_url. |
| 124 | static $resolved = array(); |
| 125 | |
| 126 | $key = get_current_blog_id() . ":$comment_id:$size"; |
| 127 | |
| 128 | if ( array_key_exists( $key, $resolved ) ) { |
| 129 | return $resolved[ $key ]; |
| 130 | } |
| 131 | |
| 132 | // Written only from an authenticated exchange with WordPress.com, so any https URL is served. |
| 133 | $stored = get_comment_meta( $comment_id, Checkpoint::META_AVATAR, true ); |
| 134 | |
| 135 | if ( ! is_string( $stored ) || $stored === '' || 'https' !== wp_parse_url( $stored, PHP_URL_SCHEME ) ) { |
| 136 | // Highlander and Verbum stored a Facebook avatar here, which the email cannot bring back. |
| 137 | // Written by the browser, so only that host is served. Legacy X avatars 404 and are skipped. |
| 138 | $stored = get_comment_meta( $comment_id, 'hc_avatar', true ); |
| 139 | $host = is_string( $stored ) ? wp_parse_url( $stored, PHP_URL_HOST ) : null; |
| 140 | |
| 141 | if ( ! is_string( $host ) || ! preg_match( '/(^|\.)graph\.facebook\.com$/', $host ) ) { |
| 142 | $stored = null; |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | $resolved[ $key ] = null === $stored ? null : Image_CDN_Core::cdn_url( $stored, array( 'resize' => "$size,$size" ) ); |
| 147 | |
| 148 | return $resolved[ $key ]; |
| 149 | } |
| 150 | } |