| author | Anthony Ly <anthonyly.com@gmail.com> |
| Mon, 19 Nov 2012 18:26:13 +0100 | |
| changeset 194 | 32102edaa81b |
| parent 136 | bde1974c263b |
| child 204 | 09a1c134465b |
| permissions | -rw-r--r-- |
| 136 | 1 |
<?php |
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/** |
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* API for fetching the HTML to embed remote content based on a provided URL. |
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* Used internally by the {@link WP_Embed} class, but is designed to be generic. |
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* |
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* @link http://codex.wordpress.org/oEmbed oEmbed Codex Article |
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* @link http://oembed.com/ oEmbed Homepage |
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* |
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* @package WordPress |
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* @subpackage oEmbed |
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*/ |
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/** |
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* oEmbed class. |
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* |
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* @package WordPress |
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* @subpackage oEmbed |
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* @since 2.9.0 |
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*/ |
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class WP_oEmbed { |
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var $providers = array(); |
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/** |
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* Constructor |
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* |
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* @uses apply_filters() Filters a list of pre-defined oEmbed providers. |
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*/ |
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function __construct() { |
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// List out some popular sites that support oEmbed. |
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// The WP_Embed class disables discovery for non-unfiltered_html users, so only providers in this array will be used for them. |
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// Add to this list using the wp_oembed_add_provider() function (see its PHPDoc for details). |
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$this->providers = apply_filters( 'oembed_providers', array( |
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'#http://(www\.)?youtube.com/watch.*#i' => array( 'http://www.youtube.com/oembed', true ), |
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'http://youtu.be/*' => array( 'http://www.youtube.com/oembed', false ), |
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'http://blip.tv/*' => array( 'http://blip.tv/oembed/', false ), |
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'#http://(www\.)?vimeo\.com/.*#i' => array( 'http://vimeo.com/api/oembed.{format}', true ), |
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'#http://(www\.)?dailymotion\.com/.*#i' => array( 'http://www.dailymotion.com/services/oembed', true ), |
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'#http://(www\.)?flickr\.com/.*#i' => array( 'http://www.flickr.com/services/oembed/', true ), |
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'#http://(.+\.)?smugmug\.com/.*#i' => array( 'http://api.smugmug.com/services/oembed/', true ), |
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'#http://(www\.)?hulu\.com/watch/.*#i' => array( 'http://www.hulu.com/api/oembed.{format}', true ), |
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'#http://(www\.)?viddler\.com/.*#i' => array( 'http://lab.viddler.com/services/oembed/', true ), |
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'http://qik.com/*' => array( 'http://qik.com/api/oembed.{format}', false ), |
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'http://revision3.com/*' => array( 'http://revision3.com/api/oembed/', false ), |
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'http://i*.photobucket.com/albums/*' => array( 'http://photobucket.com/oembed', false ), |
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'http://gi*.photobucket.com/groups/*' => array( 'http://photobucket.com/oembed', false ), |
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'#http://(www\.)?scribd\.com/.*#i' => array( 'http://www.scribd.com/services/oembed', true ), |
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'http://wordpress.tv/*' => array( 'http://wordpress.tv/oembed/', false ), |
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'#http://(.+\.)?polldaddy\.com/.*#i' => array( 'http://polldaddy.com/oembed/', true ), |
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'#http://(www\.)?funnyordie\.com/videos/.*#i' => array( 'http://www.funnyordie.com/oembed', true ), |
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'#https?://(www\.)?twitter.com/.+?/status(es)?/.*#i' => array( 'http://api.twitter.com/1/statuses/oembed.{format}', true ), |
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) ); |
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// Fix any embeds that contain new lines in the middle of the HTML which breaks wpautop(). |
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add_filter( 'oembed_dataparse', array(&$this, '_strip_newlines'), 10, 3 ); |
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} |
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/** |
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* The do-it-all function that takes a URL and attempts to return the HTML. |
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* |
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* @see WP_oEmbed::discover() |
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* @see WP_oEmbed::fetch() |
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* @see WP_oEmbed::data2html() |
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* |
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* @param string $url The URL to the content that should be attempted to be embedded. |
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* @param array $args Optional arguments. Usually passed from a shortcode. |
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* @return bool|string False on failure, otherwise the UNSANITIZED (and potentially unsafe) HTML that should be used to embed. |
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*/ |
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function get_html( $url, $args = '' ) { |
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$provider = false; |
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if ( !isset($args['discover']) ) |
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$args['discover'] = true; |
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foreach ( $this->providers as $matchmask => $data ) { |
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list( $providerurl, $regex ) = $data; |
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// Turn the asterisk-type provider URLs into regex |
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if ( !$regex ) |
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$matchmask = '#' . str_replace( '___wildcard___', '(.+)', preg_quote( str_replace( '*', '___wildcard___', $matchmask ), '#' ) ) . '#i'; |
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if ( preg_match( $matchmask, $url ) ) { |
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$provider = str_replace( '{format}', 'json', $providerurl ); // JSON is easier to deal with than XML |
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break; |
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} |
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} |
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if ( !$provider && $args['discover'] ) |
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$provider = $this->discover( $url ); |
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if ( !$provider || false === $data = $this->fetch( $provider, $url, $args ) ) |
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return false; |
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return apply_filters( 'oembed_result', $this->data2html( $data, $url ), $url, $args ); |
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} |
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/** |
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* Attempts to find oEmbed provider discovery <link> tags at the given URL. |
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* |
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* @param string $url The URL that should be inspected for discovery <link> tags. |
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* @return bool|string False on failure, otherwise the oEmbed provider URL. |
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*/ |
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function discover( $url ) { |
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$providers = array(); |
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// Fetch URL content |
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if ( $html = wp_remote_retrieve_body( wp_remote_get( $url ) ) ) { |
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// <link> types that contain oEmbed provider URLs |
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$linktypes = apply_filters( 'oembed_linktypes', array( |
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'application/json+oembed' => 'json', |
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'text/xml+oembed' => 'xml', |
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'application/xml+oembed' => 'xml', // Incorrect, but used by at least Vimeo |
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) ); |
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// Strip <body> |
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$html = substr( $html, 0, stripos( $html, '</head>' ) ); |
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// Do a quick check |
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$tagfound = false; |
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foreach ( $linktypes as $linktype => $format ) { |
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if ( stripos($html, $linktype) ) { |
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$tagfound = true; |
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break; |
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} |
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} |
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if ( $tagfound && preg_match_all( '/<link([^<>]+)>/i', $html, $links ) ) { |
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foreach ( $links[1] as $link ) { |
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$atts = shortcode_parse_atts( $link ); |
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if ( !empty($atts['type']) && !empty($linktypes[$atts['type']]) && !empty($atts['href']) ) { |
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$providers[$linktypes[$atts['type']]] = $atts['href']; |
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// Stop here if it's JSON (that's all we need) |
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if ( 'json' == $linktypes[$atts['type']] ) |
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break; |
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} |
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} |
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} |
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} |
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// JSON is preferred to XML |
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if ( !empty($providers['json']) ) |
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return $providers['json']; |
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elseif ( !empty($providers['xml']) ) |
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return $providers['xml']; |
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else |
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return false; |
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} |
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/** |
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* Connects to a oEmbed provider and returns the result. |
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* |
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* @param string $provider The URL to the oEmbed provider. |
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* @param string $url The URL to the content that is desired to be embedded. |
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* @param array $args Optional arguments. Usually passed from a shortcode. |
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* @return bool|object False on failure, otherwise the result in the form of an object. |
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*/ |
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function fetch( $provider, $url, $args = '' ) { |
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$args = wp_parse_args( $args, wp_embed_defaults() ); |
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$provider = add_query_arg( 'maxwidth', (int) $args['width'], $provider ); |
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$provider = add_query_arg( 'maxheight', (int) $args['height'], $provider ); |
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$provider = add_query_arg( 'url', urlencode($url), $provider ); |
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foreach( array( 'json', 'xml' ) as $format ) { |
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$result = $this->_fetch_with_format( $provider, $format ); |
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if ( is_wp_error( $result ) && 'not-implemented' == $result->get_error_code() ) |
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continue; |
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return ( $result && ! is_wp_error( $result ) ) ? $result : false; |
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} |
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return false; |
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} |
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/** |
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* Fetches result from an oEmbed provider for a specific format and complete provider URL |
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* |
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* @since 3.0.0 |
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* @access private |
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* @param string $provider_url_with_args URL to the provider with full arguments list (url, maxheight, etc.) |
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* @param string $format Format to use |
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* @return bool|object False on failure, otherwise the result in the form of an object. |
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*/ |
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function _fetch_with_format( $provider_url_with_args, $format ) { |
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$provider_url_with_args = add_query_arg( 'format', $format, $provider_url_with_args ); |
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$response = wp_remote_get( $provider_url_with_args ); |
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if ( 501 == wp_remote_retrieve_response_code( $response ) ) |
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return new WP_Error( 'not-implemented' ); |
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if ( ! $body = wp_remote_retrieve_body( $response ) ) |
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return false; |
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$parse_method = "_parse_$format"; |
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return $this->$parse_method( $body ); |
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} |
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/** |
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* Parses a json response body. |
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* |
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* @since 3.0.0 |
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* @access private |
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*/ |
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function _parse_json( $response_body ) { |
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return ( ( $data = json_decode( trim( $response_body ) ) ) && is_object( $data ) ) ? $data : false; |
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} |
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/** |
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* Parses an XML response body. |
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* |
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* @since 3.0.0 |
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* @access private |
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*/ |
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function _parse_xml( $response_body ) { |
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if ( function_exists('simplexml_load_string') ) { |
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$errors = libxml_use_internal_errors( 'true' ); |
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$data = simplexml_load_string( $response_body ); |
| 136 | 215 |
libxml_use_internal_errors( $errors ); |
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if ( ! is_object( $data ) ) |
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return false; |
| 136 | 218 |
|
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$return = new stdClass; |
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foreach ( $data as $key => $value ) |
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$return->$key = (string) $value; |
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222 |
|
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return $return; |
| 136 | 224 |
} |
225 |
return false; |
|
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} |
|
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||
228 |
/** |
|
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* Converts a data object from {@link WP_oEmbed::fetch()} and returns the HTML. |
|
230 |
* |
|
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* @param object $data A data object result from an oEmbed provider. |
|
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* @param string $url The URL to the content that is desired to be embedded. |
|
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* @return bool|string False on error, otherwise the HTML needed to embed. |
|
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*/ |
|
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function data2html( $data, $url ) { |
|
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if ( ! is_object( $data ) || empty( $data->type ) ) |
| 136 | 237 |
return false; |
238 |
||
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$return = false; |
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|
| 136 | 241 |
switch ( $data->type ) { |
242 |
case 'photo': |
|
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if ( empty( $data->url ) || empty( $data->width ) || empty( $data->height ) ) |
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break; |
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if ( ! is_string( $data->url ) || ! is_numeric( $data->width ) || ! is_numeric( $data->height ) ) |
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break; |
| 136 | 247 |
|
|
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$title = ! empty( $data->title ) && is_string( $data->title ) ? $data->title : ''; |
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$return = '<a href="' . esc_url( $url ) . '"><img src="' . esc_url( $data->url ) . '" alt="' . esc_attr($title) . '" width="' . esc_attr($data->width) . '" height="' . esc_attr($data->height) . '" /></a>'; |
| 136 | 250 |
break; |
251 |
||
252 |
case 'video': |
|
253 |
case 'rich': |
|
|
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if ( ! empty( $data->html ) && is_string( $data->html ) ) |
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$return = $data->html; |
| 136 | 256 |
break; |
257 |
||
258 |
case 'link': |
|
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if ( ! empty( $data->title ) && is_string( $data->title ) ) |
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$return = '<a href="' . esc_url( $url ) . '">' . esc_html( $data->title ) . '</a>'; |
| 136 | 261 |
break; |
262 |
||
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default: |
| 136 | 264 |
$return = false; |
265 |
} |
|
266 |
||
267 |
// You can use this filter to add support for custom data types or to filter the result |
|
268 |
return apply_filters( 'oembed_dataparse', $return, $data, $url ); |
|
269 |
} |
|
270 |
||
271 |
/** |
|
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* Strip any new lines from the HTML. |
| 136 | 273 |
* |
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* @access private |
| 136 | 275 |
* @param string $html Existing HTML. |
276 |
* @param object $data Data object from WP_oEmbed::data2html() |
|
277 |
* @param string $url The original URL passed to oEmbed. |
|
278 |
* @return string Possibly modified $html |
|
279 |
*/ |
|
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function _strip_newlines( $html, $data, $url ) { |
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if ( false !== strpos( $html, "\n" ) ) |
| 136 | 282 |
$html = str_replace( array( "\r\n", "\n" ), '', $html ); |
283 |
||
284 |
return $html; |
|
285 |
} |
|
286 |
} |
|
287 |
||
288 |
/** |
|
289 |
* Returns the initialized {@link WP_oEmbed} object |
|
290 |
* |
|
291 |
* @since 2.9.0 |
|
292 |
* @access private |
|
293 |
* |
|
294 |
* @see WP_oEmbed |
|
295 |
* @uses WP_oEmbed |
|
296 |
* |
|
297 |
* @return WP_oEmbed object. |
|
298 |
*/ |
|
299 |
function &_wp_oembed_get_object() { |
|
300 |
static $wp_oembed; |
|
301 |
||
302 |
if ( is_null($wp_oembed) ) |
|
303 |
$wp_oembed = new WP_oEmbed(); |
|
304 |
||
305 |
return $wp_oembed; |
|
306 |
} |