const DB_VERSION = '0.2';

public static function init() {

if ( true === file_exists( dirname(__FILE__) . '/vendor/autoload.php' ) ) {

include( dirname( __FILE__ ) . '/vendor/autoload.php' );

}

self::upgrade_check();

if( is_admin() ) {

require_once( __DIR__ . '/admin/admin.php' );

VSEO_Admin::init();

}

Voce_Settings_API::GetInstance()

->add_page( 'SEO Settings', 'SEO Settings', 'vseo', 'manage_options', '', 'options-general.php' )

->add_group( 'General', 'vseo-general' )

->add_setting( 'Add nodp', 'nodp', array(

'display_callback' => 'vs_display_checkbox',

'sanitize_callbacks' => array( 'vs_sanitize_checkbox' ),

'description' => 'Prevents search engines from using the DMOZ description for pages from this site in the search results.'

) )->group

->add_setting( 'Add noydir', 'noydir', array(

'display_callback' => 'vs_display_checkbox',

'sanitize_callbacks' => array( 'vs_sanitize_checkbox' ),

'description' => 'Prevents search engines from using the Yahoo! directory description for pages from this site in the search results.'

) );

remove_action( 'wp_head', 'rel_canonical' );

//add namespaces

add_filter( 'language_attributes', function ( $output ) {

$prefixes = array(

'og' => 'http://ogp.me/ns#',

'fb' => 'http://ogp.me/ns/fb#',

'article' => 'http://ogp.me/ns/article#'

);

$prefixes = apply_filters( 'opengraph_prefixes', $prefixes );

$prefix_str = '';

foreach( $prefixes as $k => $v ) {

$prefix_str .= $k . ': ' . $v . ' ';

}

$prefix_str = trim( $prefix_str );

if( preg_match( '/(prefix\s*=\s*[\"|\'])/i', $output ) ) {

$output = preg_replace( '/(prefix\s*=\s*[\"|\'])/i', '${1}' . $prefix_str, $output );

} else {

$output .= ' prefix="' . $prefix_str . '"';

}

return $output;

} );

add_filter( 'wp_title', array( __CLASS__, 'seo_title' ), 10, 3 );

add_action( 'wp_head', array( __CLASS__, 'on_wp_head' ) );

}

static function seo_title( $title, $sep, $seplocation ) {

$new_title = '';

$t_sep = '%WP_TITILE_SEP%';

$queried_object = get_queried_object();

$queried_post_type = get_post_type_object( get_post_type( $queried_object ) );

if( self::is_singular_viewable_post_query() ) {

$post_id = get_queried_object_id();

$vseo_meta = (array) get_post_meta( $post_id, 'vseo_meta', true );

if( ! empty( $vseo_meta[ 'title' ] ) ) {

$new_title = apply_filters( 'single_post_title', $vseo_meta[ 'title' ], $queried_object );

}

} elseif( is_tax() || is_category() || is_tag() ) {

$new_title = self::get_term_seo_title();

}

if( ! empty( $new_title ) ) {

$title = $new_title;

if( ! empty( $title ) ) {

$prefix = " $sep ";

}

// Determines position of the separator and direction of the breadcrumb

if( 'right' === $seplocation ) { // sep on right, so reverse the order

$title_array = explode( $t_sep, $title );

$title_array = array_reverse( $title_array );

$title = implode( " $sep ", $title_array ) . $prefix;

} else {

$title_array = explode( $t_sep, $title );

$title = $prefix . implode( " $sep ", $title_array );

}

}

return $title;

}

private static function get_term_seo_title() {

$queried_object = get_queried_object();

$term_id = $queried_object->term_id;

$taxonomy = $queried_object->taxonomy;

$option_key = $taxonomy . '_' . $term_id;

$term_meta = get_option( 'vseo_term_meta' );

if( ! isset( $term_meta[ $option_key ][ 'title' ] ) ) {

return;

}

$seo_title = $term_meta[ $option_key ][ 'title' ];

$title_filter = 'single_cat_title';

if( is_tax() ) {

$title_filter = 'single_term_filter';

} elseif( is_tag() ) {

$title_filter = 'single_tag_filter';

}

$new_title = apply_filters( $title_filter, $seo_title );

return $new_title;

}

private static function upgrade_check() {

$db_version = get_option( 'VSEO_Version', '0.0' );

if( $db_version < 0.1 ) {

Voce_Settings_API::GetInstance()->set_setting( 'robots-nodp', 'vseo-general', true );

Voce_Settings_API::GetInstance()->set_setting( 'robots-noydir', 'vseo-general', true );

}

if( $db_version < 0.2 && function_exists( 'wp_get_split_term' ) ) {

$term_meta = $updated_term_meta = get_option( 'vseo_term_meta' );

if( is_array( $term_meta ) ) {

foreach( $term_meta as $taxonomy_term => $term_data ) {

$tax_term_arr = explode( '_', $taxonomy_term );

if( is_array( $tax_term_arr ) && ! empty( $tax_term_arr ) ) {

$term_id = array_pop( $tax_term_arr );

$taxonomy = implode( '_', $tax_term_arr );

$new_term_id = wp_get_split_term( $term_id, $taxonomy );

if( $new_term_id !== false ) {

unset( $updated_term_meta[ $taxonomy_term ] );

$updated_term_meta[ sprintf( '%s_%s', $taxonomy, $new_term_id ) ] = $term_data;

}

}

}

update_option( 'vseo_term_meta', $updated_term_meta );

}

}

update_option( 'VSEO_Version', self::DB_VERSION );

}

public static function generate_facebook_seo_data( $meta_objects = array() ) {

if( $canonical = self::get_canonical_url() ) {

$meta_objects = self::create_meta_object( 'og:url', 'meta', array( 'property' => 'og:url', 'content' => esc_url( $canonical ) ), $meta_objects );

}

$meta_objects = self::create_meta_object( 'og:site_name', 'meta', array( 'property' => 'og:site_name', 'content' => esc_attr( get_bloginfo( 'name' ) ) ), $meta_objects );

$meta_objects = self::create_meta_object( 'og:locale', 'meta', array( 'property' => 'og:locale', 'content' => 'en_us' ), $meta_objects );

$description = self::get_meta_description();

$queried_object = get_queried_object();

if( isset( $queried_object->post_type ) || ( is_tax() || is_category() || is_tag() ) || is_home() || is_front_page() ) {

$og_description = self::get_seo_meta( 'og_description', get_queried_object_id() );

if( ! $og_description ) {

$og_description = $description;

}

if( $og_description ) {

$meta_objects = self::create_meta_object( 'og:description', 'meta', array( 'property' => 'og:description', 'content' => esc_attr( $og_description ) ), $meta_objects );

}

}

$meta_objects = self::create_meta_object( 'og:title', 'meta', array( 'property' => 'og:title', 'content' => esc_attr( self::get_social_title( 'og_title' ) ) ), $meta_objects );

$meta_objects = self::create_meta_object( 'og:type', 'meta', array( 'property' => 'og:type', 'content' => apply_filters( 'vseo_ogtype', 'article' ) ), $meta_objects );

if( $image = self::get_meta_image() ) {

$meta_objects = self::create_meta_object( 'og:image', 'meta', array( 'property' => 'og:image', 'content' => esc_attr( $image ) ), $meta_objects );

}

return $meta_objects;

}

public static function generate_twitter_seo_data( $meta_objects = array() ) {

if( $canonical = self::get_canonical_url() ) {

$meta_objects = self::create_meta_object( 'twitter:url', 'meta', array( 'name' => 'twitter:url', 'content' => esc_url( $canonical ) ), $meta_objects );

}

$description = self::get_meta_description();

$queried_object = get_queried_object();

if( isset( $queried_object->post_type ) || ( is_tax() || is_category() || is_tag() ) ) {

$twitter_description = self::get_seo_meta( 'twitter_description', get_queried_object_id() );

if( ! $twitter_description ) {

$twitter_description = $description;

}

$meta_objects = self::create_meta_object( 'twitter:description', 'meta', array( 'name' => 'twitter:description', 'content' => esc_attr( $twitter_description ) ), $meta_objects );

}

$meta_objects = self::create_meta_object( 'twitter:title', 'meta', array( 'name' => 'twitter:title', 'content' => esc_attr( self::get_social_title( 'twitter_title' ) ) ), $meta_objects );

$meta_objects = self::create_meta_object( 'twitter:card', 'meta', array( 'name' => 'twitter:card', 'content' => esc_attr( apply_filters( 'vseo_twittercard', 'summary' ) ) ), $meta_objects );

if( $image = self::get_meta_image() ) {

$meta_objects = self::create_meta_object( 'twitter:image', 'meta', array( 'name' => 'twitter:image', 'content' => esc_attr( apply_filters( 'vseo_twitterimage', $image ) ) ), $meta_objects );

}

return $meta_objects;

}

private static function create_meta_object( $key, $type, $attributes = array(), $meta_objects = array() ) {

$meta_objects[ $key ] = array(

'type' => $type,

'attributes' => $attributes

);

return $meta_objects;

}

public static function output_meta_objects_html( $meta_objects = array() ) {

$html = '';

$allowed_tags = array(

'meta' => array(

'charset' => true,

'content' => true,

'http-equiv' => true,

'name' => true,

'property' => true

),

'link' => array(

'href' => true,

'rel' => true,

'media' => true,

'hreflang' => true,

'type' => true,

'sizes' => true

),

);

foreach( $meta_objects as $meta_object => $properties ) {

$atts_string = '';

$element = ! empty( $properties[ 'type' ] ) ? $properties[ 'type' ] : false;

$attributes = ! empty( $properties[ 'attributes' ] ) ? $properties[ 'attributes' ] : false;

if( $element && $attributes && is_array( $attributes ) ) {

foreach( $attributes as $att => $value ) {

$atts_string .= sprintf( '%s="%s" ', $att, $value );

}

$html .= sprintf( '<%s %s/>' . PHP_EOL, $element, $atts_string );

}

}

echo wp_kses( $html, $allowed_tags );

}

public static function on_wp_head() {

$meta_objects = array();

do_action( 'voce_seo_before_wp_head' );

echo "<!-- voce_seo -->\n";

$meta_objects = self::robots_meta();

if( $canonical = self::get_canonical_url() ) {

$meta_objects = self::create_meta_object( 'canonical', 'link', array( 'rel' => 'canonical', 'href' => esc_url( $canonical ) ), $meta_objects );

}

if( $description = self::get_meta_description() ) {

$meta_objects = self::create_meta_object( 'description', 'meta', array( 'name' => 'description', 'content' => esc_attr( $description ) ), $meta_objects );

}

if( $keywords = self::get_meta_keywords() ) {

$meta_objects = self::create_meta_object( 'keywords', 'meta', array( 'name' => 'keywords', 'content' => esc_attr( $keywords ) ), $meta_objects );

}

if( apply_filters( 'vseo_use_facebook_meta', true ) ) {

$meta_objects = self::generate_facebook_seo_data( $meta_objects );

}

if( apply_filters( 'vseo_use_twitter_meta', true ) ) {

$meta_objects = self::generate_twitter_seo_data( $meta_objects );

}

$meta_objects = apply_filters( 'vseo_meta_objects', $meta_objects );

self::output_meta_objects_html( $meta_objects );

echo '<!-- end voce_seo -->' . "\n";

do_action( 'voce_seo_after_wp_head' );

}

public static function get_social_title( $meta_key ) {

$title = '';

if( is_home() || is_front_page() ) {

$title = get_bloginfo( 'name' );

} else {

if( is_author() ) {

$author = get_queried_object();

$title = $author->display_name;

} else {

if( self::is_singular_viewable_post_query() ) {

$post = get_queried_object();

$title = self::get_seo_meta( $meta_key, $post->ID );

if( ! $title ) {

$vseo_meta = (array) get_post_meta( $post->ID, 'vseo_meta', true );;

if( array_key_exists( 'title', $vseo_meta ) ) {

$title = $vseo_meta[ 'title' ];

}

if( ! $title ) {

$title = empty( $post->post_title ) ? ' ' : wp_kses( $post->post_title, array() );

}

}

} else {

if( is_tax() || is_category() || is_tag() ) {

$title = self::get_term_seo_title();

} else {

$title = '';

}

}

}

}

return apply_filters( 'vseo_ogtitle', $title );

}

public static function get_seo_meta( $key, $post_id = 0 ) {

if( ! $post_id ) {

$post_id = get_the_ID();

}

$vseo_meta = (array) get_post_meta( $post_id, 'vseo_meta', true );

return isset( $vseo_meta[ $key ] ) ? $vseo_meta[ $key ] : null;

}

public static function get_meta_description() {

if( get_query_var( 'paged' ) && get_query_var( 'paged' ) > 1 ) {

return '';

}

$description = '';

$queried_object = get_queried_object();

if( isset( $queried_object->post_type ) ) {

if( ! ( $description = self::get_seo_meta( 'description', get_queried_object_id() ) ) ) {

//get description from excerpt/content

$description = empty( $queried_object->post_excerpt ) ? $queried_object->post_content : $queried_object->post_excerpt;

$description = str_replace( ']]>', ']]&gt;', $description );

$description = preg_replace( '|\[(.+?)\](.+?\[/\\1\])?|s', '', $description );

$description = strip_tags( $description );

$max = 250;

if( $max < strlen( $description ) ) {

while( $description[ $max ] !== ' ' && $max > 40 ) {

$max--;

}

}

$description = substr( $description, 0, $max );

$description = trim( stripcslashes( $description ) );

$description = preg_replace( "/\s\s+/u", " ", $description );

}

} else {

if( is_tax() || is_category() || is_tag() ) {

$queried_object = get_queried_object();

$term_id = $queried_object->term_id;

$taxonomy = $queried_object->taxonomy;

$description = term_description( $term_id, $taxonomy );

} elseif( is_search() ) {

$description = '';

} else {

$description = get_bloginfo( 'description', 'display' );

}

}

$description = apply_filters( 'seo_meta_description', trim( $description ) );

return strip_tags( stripslashes( $description ) );

}

public static function get_meta_keywords() {

$keywords = '';

if( self::is_singular_viewable_post_query() ) {

$keywords = self::get_seo_meta( 'keywords', get_queried_object_id() );

}

return apply_filters( 'seo_meta_keywords', trim( $keywords ) );

}

private static function robots_meta() {

global $wp_query;

$queried_object = get_queried_object();

$robots_defaults = array(

'index' => 'index',

'follow' => 'follow',

'other' => array(),

);

//use this to replace the defaults, these values will be overwritten by post meta if set

$robots = apply_filters( 'vseo_robots_defaults', $robots_defaults );

if( isset( $queried_object->post_type ) ) {

if( $follow = self::get_seo_meta( 'robots-nofollow', get_queried_object_id() ) ) {

$robots[ 'follow' ] = $follow;

}

if( $index = self::get_seo_meta( 'robots-noindex', get_queried_object_id() ) ) {

$robots[ 'index' ] = $index;

}

} else {

if( is_search() || is_archive() ) {

$robots[ 'index' ] = 'noindex';

}

}

foreach( array( 'nodp', 'noydir' ) as $robot ) {

if( Voce_Settings_API::GetInstance()->get_setting( $robot, 'vseo-general' ) ) {

$robots[ 'other' ][] = $robot;

}

}

//final filter to force values

$robots = apply_filters( 'vseo_robots', $robots );

$robots = array_intersect_key( $robots, $robots_defaults );

if( isset( $robots[ 'other' ] ) && is_array( $robots[ 'other' ] ) ) {

$other = array_unique( $robots[ 'other' ] );

unset( $robots[ 'other' ] );

$robots = array_merge( $robots, $other );

}

$robotsstr = implode( ',', $robots );

if( $robotsstr !== '' ) {

return self::create_meta_object( 'robots', 'meta', array( 'name' => 'robots', 'content' => esc_attr( $robotsstr ) ) );

} else {

return array();

}

}

private static function get_canonical_url() {

global $wp_rewrite;

$queried_object = get_queried_object();

$canonical = '';

if( isset( $queried_object->post_type ) ) {

if( ! ( $canonical = self::get_seo_meta( 'canonical', get_queried_object_id() ) ) || is_null( $canonical ) ) {

$canonical = get_permalink( $queried_object->ID );

// Fix paginated pages

if( get_query_var( 'page' ) > 1 ) {

$canonical = user_trailingslashit( trailingslashit( $canonical ) . get_query_var( 'page' ) );

}

}

} else {

if( is_search() ) {

$canonical = get_search_link();

} else {

if( is_front_page() ) {

$canonical = home_url( '/' );

} else {

if( is_home() && 'page' === get_option( 'show_on_front' ) ) {

$canonical = get_permalink( get_option( 'page_for_posts' ) );

} else {

if( is_tax() || is_tag() || is_category() ) {

if( function_exists( 'wpcom_vip_get_term_link' ) ) {

$canonical = wpcom_vip_get_term_link( $queried_object, $queried_object->taxonomy );

} else {

$canonical = get_term_link( $queried_object, $queried_object->taxonomy );

}

} else {

if( function_exists( 'get_post_type_archive_link' ) && is_post_type_archive() ) {

$canonical = get_post_type_archive_link( get_post_type() );

} else {

if( is_author() ) {

$canonical = get_author_posts_url( get_query_var( 'author' ), get_query_var( 'author_name' ) );

} else {

if( is_archive() ) {

if( is_date() ) {

if( is_day() ) {

$canonical = get_day_link( get_query_var( 'year' ), get_query_var( 'monthnum' ), get_query_var( 'day' ) );

} else {

if( is_month() ) {

$canonical = get_month_link( get_query_var( 'year' ), get_query_var( 'monthnum' ) );

} else {

if( is_year() ) {

$canonical = get_year_link( get_query_var( 'year' ) );

}

}

}

}

}

}

}

}

}

}

}

if( $canonical && get_query_var( 'paged' ) > 1 ) {

$canonical = user_trailingslashit( trailingslashit( $canonical ) . trailingslashit( $wp_rewrite->pagination_base ) . get_query_var( 'paged' ) );

}

}

return apply_filters( 'vseo_canonical_url', $canonical );

}

private static function get_meta_image() {

$queried_object = get_queried_object();

$img = '';

if( isset( $queried_object->post_type ) ) {

if( has_post_thumbnail( get_queried_object_id() ) ) {

$img = wp_get_attachment_image_src( get_post_thumbnail_id( get_queried_object_id() ), apply_filters( 'vseo_image_size', 'full' ) );

if( ! empty( $img[ 0 ] ) ) {

$img = $img[ 0 ];

}

}

}

return apply_filters( 'vseo_meta_image', $img );

}

private static function is_singular_viewable_post_query() {

$queried_object = get_queried_object();

if( is_a( $queried_object, 'WP_Post' ) ) {

$post_type_object = get_post_type_object( get_post_type( $queried_object ) );

return $post_type_object->publicly_queryable || ( $post_type_object->_builtin && $post_type_object->public );

}

return false;

}