forked from Automattic/jetpack
-
Notifications
You must be signed in to change notification settings - Fork 0
/
class.jetpack-twitter-cards.php
217 lines (185 loc) · 9.12 KB
/
class.jetpack-twitter-cards.php
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
<?php
/* Twitter Cards
*
* Hooks onto the Open Graph protocol and extends it by adding only the tags
* we need for twitter cards.
*
* @see /wp-content/blog-plugins/open-graph.php
* @see https://dev.twitter.com/docs/cards
*/
class Jetpack_Twitter_Cards {
static function twitter_cards_tags( $og_tags ) {
global $post;
if ( post_password_required() ) {
return $og_tags;
}
if ( apply_filters( 'jetpack_disable_twitter_cards', false ) ) {
return $og_tags;
}
/*
* These tags apply to any page (home, archives, etc)
*/
$site_tag = self::site_tag();
$site_tag = apply_filters( 'jetpack_sharing_twitter_via', $site_tag, ( is_singular() ? $post->ID : null ) );
$site_tag = apply_filters( 'jetpack_twitter_cards_site_tag', $site_tag, $og_tags );
$og_tags['twitter:site'] = self::sanitize_twitter_user( $site_tag );
if ( ! is_singular() || ! empty( $og_tags['twitter:card'] ) ) {
return $og_tags;
}
/*
* The following tags only apply to single pages.
*/
$card_type = 'summary';
// Try to give priority to featured images
if ( class_exists('Jetpack_PostImages') ) {
$featured = Jetpack_PostImages::from_thumbnail( $post->ID, 240, 240 );
if ( !empty( $featured ) && count( $featured ) > 0 ) {
if ( (int) $featured[0]['src_width'] >= 280 && (int) $featured[0]['src_height'] >= 150 ) {
if ( 'image' === get_post_format( $post->ID ) ) {
$card_type = 'photo';
} else {
$card_type = 'summary_large_image';
}
$og_tags['twitter:image:src'] = add_query_arg( 'w', 640, $featured[0]['src'] );
} else {
$og_tags['twitter:image'] = add_query_arg( 'w', 240, $featured[0]['src'] );
}
}
}
// Only proceed with media analysis if a featured image has not superseded it already.
if ( empty( $og_tags['twitter:image'] ) && empty( $og_tags['twitter:image:src'] ) ) {
if ( ! class_exists( 'Jetpack_Media_Summary' ) && defined('IS_WPCOM') && IS_WPCOM ) {
include( WP_CONTENT_DIR . '/lib/class.wpcom-media-summary.php' );
}
// Test again, class should already be auto-loaded in Jetpack.
// If not, skip extra media analysis and stick with a summary card
if ( class_exists( 'Jetpack_Media_Summary' ) ) {
$extract = Jetpack_Media_Summary::get( $post->ID );
if ( 'gallery' == $extract['type'] ) {
list( $og_tags, $card_type ) = self::twitter_cards_define_type_based_on_image_count( $og_tags, $extract );
} else if ( 'video' == $extract['type'] ) {
// Leave as summary, but with large pict of poster frame (we know those comply to Twitter's size requirements)
$card_type = 'summary_large_image';
$og_tags['twitter:image:src'] = add_query_arg( 'w', 640, $extract['image'] );
} else {
list( $og_tags, $card_type ) = self::twitter_cards_define_type_based_on_image_count( $og_tags, $extract );
}
}
}
$og_tags['twitter:card'] = $card_type;
// If we have information on the author/creator, then include that as well
if ( ! empty( $post ) && ! empty( $post->post_author ) ) {
$handle = apply_filters( 'jetpack_sharing_twitter_via', '', $post->ID );
if ( ! empty( $handle ) && 'wordpressdotcom' != $handle && 'jetpack' != $handle ) {
$og_tags['twitter:creator'] = self::sanitize_twitter_user( $handle );
}
}
// Make sure we have a description for Twitter, their validator isn't happy without some content (single space not valid).
if ( ! isset( $og_tags['og:description'] ) || '' == trim( $og_tags['og:description'] ) || __('Visit the post for more.', 'jetpack') == $og_tags['og:description'] ) { // empty( trim( $og_tags['og:description'] ) ) isn't valid php
$has_creator = ( ! empty($og_tags['twitter:creator']) && '@wordpressdotcom' != $og_tags['twitter:creator'] ) ? true : false;
if ( 'photo' == $card_type ) {
$og_tags['twitter:description'] = ( $has_creator ) ? sprintf( __('Photo post by %s.', 'jetpack'), $og_tags['twitter:creator'] ) : __('Photo post.', 'jetpack');
} elseif ( ! empty( $extract ) && 'video' == $extract['type'] ) { // use $extract['type'] since $card_type is 'summary' for video posts
$og_tags['twitter:description'] = ( $has_creator ) ? sprintf( __('Video post by %s.', 'jetpack'), $og_tags['twitter:creator'] ) : __('Video post.', 'jetpack');
} elseif ( 'gallery' == $card_type ) {
$og_tags['twitter:description'] = ( $has_creator ) ? sprintf( __('Gallery post by %s.', 'jetpack'), $og_tags['twitter:creator'] ) : __('Gallery post.', 'jetpack');
} else {
$og_tags['twitter:description'] = ( $has_creator ) ? sprintf( __('Post by %s.', 'jetpack'), $og_tags['twitter:creator'] ) : __('Visit the post for more.', 'jetpack');
}
}
return $og_tags;
}
static function sanitize_twitter_user( $str ) {
return '@' . preg_replace( '/^@/', '', $str );
}
static function prioritize_creator_over_default_site( $site_tag, $og_tags = array() ) {
if ( ! empty( $og_tags['twitter:creator'] ) && in_array( $site_tag, array( '@wordpressdotcom', '@jetpack' ) ) ) {
$site_tag = $og_tags['twitter:creator'];
}
return $site_tag;
}
static function twitter_cards_define_type_based_on_image_count( $og_tags, $extract ) {
$card_type = 'summary';
$img_count = $extract['count']['image'];
if ( empty( $img_count ) ) {
// No images, use Blavatar as a thumbnail for the summary type.
if ( function_exists('blavatar_domain') ) {
$blavatar_domain = blavatar_domain( site_url() );
if ( blavatar_exists( $blavatar_domain ) ) {
$og_tags['twitter:image'] = blavatar_url( $blavatar_domain, 'img', 240 );
}
}
// Not falling back on Gravatar, because there's no way to know if we end up with an auto-generated one.
} elseif ( 1 == $img_count && ( 'image' == $extract['type'] || 'gallery' == $extract['type'] ) ) {
// 1 image = photo
// Test for $extract['type'] to limit to image and gallery, so we don't send a potential fallback image like a Gravatar as a photo post.
$card_type = 'photo';
$og_tags['twitter:image'] = add_query_arg( 'w', 1400, ( empty( $extract['images'] ) ) ? $extract['image'] : $extract['images'][0]['url'] );
} elseif ( $img_count <= 3 ) {
// 2-3 images = summary with small thumbnail
$og_tags['twitter:image'] = add_query_arg( 'w', 240, ( empty( $extract['images'] ) ) ? $extract['image'] : $extract['images'][0]['url'] );
} elseif ( $img_count >= 4 ) {
// >= 4 images = gallery
$card_type = 'gallery';
$og_tags = self::twitter_cards_gallery( $extract, $og_tags );
}
return array( $og_tags, $card_type );
}
static function twitter_cards_gallery( $extract, $og_tags ) {
foreach( $extract['images'] as $key => $value ) {
if ( $key > 3 ) {
break; // Can only send a max of 4 picts (https://dev.twitter.com/docs/cards/types/gallery-card)
}
$og_tags[ 'twitter:image' . $key ] = add_query_arg( 'w', 640, $value['url'] );
}
return $og_tags;
}
static function twitter_cards_output( $og_tag ) {
return ( false !== strpos( $og_tag, 'twitter:' ) ) ? preg_replace( '/property="([^"]+)"/', 'name="\1"', $og_tag ) : $og_tag;
}
static function settings_init() {
add_settings_section( 'jetpack-twitter-cards-settings', 'Twitter Cards', '__return_false', 'sharing' );
add_settings_field(
'jetpack-twitter-cards-site-tag',
__( 'Twitter Site Tag', 'jetpack' ),
array( __CLASS__, 'settings_field' ),
'sharing',
'jetpack-twitter-cards-settings',
array(
'label_for' => 'jetpack-twitter-cards-site-tag',
)
);
}
static function sharing_global_options() {
do_settings_fields( 'sharing', 'jetpack-twitter-cards-settings' );
}
static function site_tag() {
$site_tag = get_option( 'jetpack-twitter-cards-site-tag' );
if ( empty( $site_tag ) ) {
$site_tag = ( defined( 'IS_WPCOM' ) && IS_WPCOM ) ? 'wordpressdotcom' : 'jetpack';
}
return $site_tag;
}
static function settings_field() {
wp_nonce_field( 'jetpack-twitter-cards-settings', 'jetpack_twitter_cards_nonce', false );
?>
<input type="text" id="jetpack-twitter-cards-site-tag" class="regular-text" name="jetpack-twitter-cards-site-tag" value="<?php echo esc_attr( get_option( 'jetpack-twitter-cards-site-tag' ) ); ?>" />
<p class="description" style="width: auto;"><?php esc_html_e( 'The Twitter username of the owner of this site\'s domain.', 'jetpack' ); ?></p>
<?php
}
static function settings_validate() {
if ( wp_verify_nonce( $_POST['jetpack_twitter_cards_nonce'], 'jetpack-twitter-cards-settings' ) ) {
update_option( 'jetpack-twitter-cards-site-tag', trim( ltrim( strip_tags( $_POST['jetpack-twitter-cards-site-tag'] ), '@' ) ) );
}
}
static function init() {
add_filter( 'jetpack_open_graph_tags', array( __CLASS__, 'twitter_cards_tags' ) );
add_filter( 'jetpack_open_graph_output', array( __CLASS__, 'twitter_cards_output' ) );
add_filter( 'jetpack_twitter_cards_site_tag', array( __CLASS__, 'site_tag' ), -99 );
add_filter( 'jetpack_twitter_cards_site_tag', array( __CLASS__, 'prioritize_creator_over_default_site' ), 99, 2 );
add_action( 'admin_init', array( __CLASS__, 'settings_init' ) );
add_action( 'sharing_global_options', array( __CLASS__, 'sharing_global_options' ) );
add_action( 'sharing_admin_update', array( __CLASS__, 'settings_validate' ) );
}
}
Jetpack_Twitter_Cards::init();