forked from facebookarchive/wordpress
-
Notifications
You must be signed in to change notification settings - Fork 1
/
Copy pathfb-open-graph.php
171 lines (141 loc) · 6.86 KB
/
fb-open-graph.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
<?php
/**
* Recursively build RDFa <meta> elements used for Open Graph protocol
*
* @since 1.0
* @param string $property whitespace separated list of CURIEs placed in a property attribute
* @param mixed content attribute value for the given property. use an array for array property values or structured properties
*/
function fb_output_og_protocol( $property, $content ) {
if ( empty( $property ) || empty( $content ) )
return;
// array of property values or structured property
if ( is_array( $content ) ) {
foreach( $content as $structured_property => $content_value ) {
// handle numeric keys from regular arrays
// account for the special structured property of url which is equivalent to the root tag and sets up the structure
if ( ! is_string( $structured_property ) || $structured_property === 'url' )
fb_output_og_protocol( $property, $content_value );
else
fb_output_og_protocol( $property . ':' . $structured_property, $content_value );
}
}
else {
echo "<meta property=\"$property\" content=\"" . esc_attr( $content ) . "\" />\n";
}
}
function fb_strip_and_format_desc( $post ) {
$desc_no_html = "";
$desc_no_html = strip_shortcodes( $desc_no_html ); // Strip shortcodes first in case there is HTML inside the shortcode
$desc_no_html = wp_strip_all_tags( $desc_no_html ); // Strip all html
$desc_no_html = trim( $desc_no_html ); // Trim the final string, we may have stripped everything out of the post so this will make the value empty if that's the case
// Check if empty, may be that the strip functions above made excerpt empty, doubhtful but we want to be 100% sure.
if( empty($desc_no_html) ) {
$desc_no_html = $post->post_content; // Start over, this time with the post_content
$desc_no_html = strip_shortcodes( $desc_no_html ); // Strip shortcodes first in case there is HTML inside the shortcode
$desc_no_html = str_replace(']]>', ']]>', $desc_no_html); // Angelo Recommendation, if for some reason ]]> happens to be in the_content, rare but We've seen it happen
$desc_no_html = wp_strip_all_tags($desc_no_html);
$desc_length = strlen($desc_no_html);
$desc_no_html = substr($desc_no_html, 0, 255);
if ( $desc_no_html > $desc_length ) {
$desc_no_html .= '...';
}
$desc_no_html = trim($desc_no_html); // Trim the final string, we may have stripped everything out of the post so this will make the value empty if that's the case
}
$desc_no_html = str_replace( array( "\r\n", "\r", "\n" ), ' ',$desc_no_html); // I take it Facebook doesn't like new lines?
return $desc_no_html;
}
/**
* Add Open Graph protocol markup to <head>
*
* @since 1.0
*/
function fb_add_og_protocol() {
global $post;
$meta_tags = array(
'http://ogp.me/ns#locale' => fb_get_locale(),
'http://ogp.me/ns#site_name' => get_bloginfo( 'name' ),
'http://ogp.me/ns#type' => 'website'
);
if ( is_home() || is_front_page() ) {
$meta_tags['http://ogp.me/ns#title'] = get_bloginfo( 'name' );
$meta_tags['http://ogp.me/ns#description'] = get_bloginfo( 'description' );
} else if ( is_single() ) {
$post_type = get_post_type();
$meta_tags['http://ogp.me/ns#type'] = 'article';
$meta_tags['http://ogp.me/ns#url'] = apply_filters( 'rel_canonical', get_permalink() );
if ( post_type_supports( $post_type, 'title' ) )
$meta_tags['http://ogp.me/ns#title'] = get_the_title();
if ( post_type_supports( $post_type, 'excerpt' ) ) {
// thanks to Angelo Mandato (http://wordpress.org/support/topic/plugin-facebook-plugin-conflicts-with-powerpress?replies=16)
// Strip and format the wordpress way, but don't apply any other filters which adds junk that ends up getitng stripped back out
if ( !post_password_required($post) ) {
// First lets get the post excerpt (shouldn't have any html, but anyone can enter anything...)
$meta_tags['http://ogp.me/ns#description'] = fb_strip_and_format_desc ( $post );
}
}
$meta_tags['http://ogp.me/ns/article#published_time'] = get_the_date('c');
$meta_tags['http://ogp.me/ns/article#modified_time'] = get_the_modified_date('c');
if ( post_type_supports( $post_type, 'author' ) && isset( $post->post_author ) )
$meta_tags['http://ogp.me/ns/article#author'] = get_author_posts_url( $post->post_author );
// add the first category as a section. all other categories as tags
$cat_ids = get_the_category();
if ( ! empty( $cat_ids ) ) {
$cat = get_category( $cat_ids[0] );
if ( ! empty( $cat ) )
$meta_tags['http://ogp.me/ns/article#section'] = $cat->name;
//output the rest of the categories as tags
unset( $cat_ids[0] );
if ( ! empty( $cat_ids ) ) {
$meta_tags['http://ogp.me/ns/article#tag'] = array();
foreach( $cat_ids as $cat_id ) {
$cat = get_category( $cat_id );
$meta_tags['http://ogp.me/ns/article#tag'][] = $cat->name;
unset( $cat );
}
}
}
// add tags. treat tags as lower priority than multiple categories
$tags = get_the_tags();
if ( $tags ) {
if ( ! array_key_exists( 'http://ogp.me/ns/article#tag', $meta_tags ) )
$meta_tags['http://ogp.me/ns/article#tag'] = array();
foreach ( $tags as $tag ) {
$meta_tags['http://ogp.me/ns/article#tag'][] = $tag->name;
}
}
// does current post type and the current theme support post thumbnails?
if ( post_type_supports( $post_type, 'thumbnail' ) && function_exists( 'has_post_thumbnail' ) && has_post_thumbnail() ) {
list( $post_thumbnail_url, $post_thumbnail_width, $post_thumbnail_height ) = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'full' );
if ( ! empty( $post_thumbnail_url ) ) {
$image = array( 'url' => $post_thumbnail_url );
if ( ! empty( $post_thumbnail_width ) )
$image['width'] = absint( $post_thumbnail_width );
if ( ! empty($post_thumbnail_height) )
$image['height'] = absint( $post_thumbnail_height );
$meta_tags['http://ogp.me/ns#image'] = array( $image );
}
}
}
else if ( is_author() && isset( $post->post_author ) ) {
$meta_tags['http://ogp.me/ns#type'] = 'profile';
$meta_tags['http://ogp.me/ns/profile#first_name'] = get_the_author_meta( 'first_name', $post->post_author );
$meta_tags['http://ogp.me/ns/profile#last_name'] = get_the_author_meta( 'last_name', $post->post_author );
if ( is_multi_author() )
$meta_tags['http://ogp.me/ns/profile#username'] = get_the_author_meta( 'login', $post->post_author );
}
else if ( is_page() ) {
$meta_tags['http://ogp.me/ns#type'] = 'article';
$meta_tags['http://ogp.me/ns#title'] = get_the_title();
$meta_tags['http://ogp.me/ns#url'] = apply_filters( 'rel_canonical', get_permalink() );
}
$options = get_option( 'fb_options' );
if ( ! empty( $options['app_id'] ) )
$meta_tags['http://ogp.me/ns/fb#app_id'] = $options['app_id'];
$meta_tags = apply_filters( 'fb_meta_tags', $meta_tags, $post );
foreach ( $meta_tags as $property => $content ) {
fb_output_og_protocol( $property, $content );
}
}
add_action( 'wp_head', 'fb_add_og_protocol' );
?>