<?php

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/**

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* TED Player embed code

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* http://www.ted.com

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*

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* Examples:

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* http://www.ted.com/talks/view/id/210

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* http://www.ted.com/talks/marc_goodman_a_vision_of_crimes_in_the_future.html

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* [ted id="210" lang="en"]

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* [ted id="http://www.ted.com/talks/view/id/210" lang="en"]

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* [ted id=1539 lang=fr width=560 height=315]

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*

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* @package automattic/jetpack

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*/

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if ( ! defined( 'ABSPATH' ) ) {

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exit( 0 );

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}

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wp_oembed_add_provider( '!https?://(www\.)?ted.com/talks/view/id/.+!i', 'https://www.ted.com/talks/oembed.json', true );

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wp_oembed_add_provider( '!https?://(www\.)?ted.com/talks/[a-zA-Z\-\_]+\.html!i', 'https://www.ted.com/talks/oembed.json', true );

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/**

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* Get the unique ID of a TED video.

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* Used in Jetpack_Media_Meta_Extractor.

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*

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* @param array $atts Shortcode attributes.

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*/

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function jetpack_shortcode_get_ted_id( $atts ) {

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return ( ! empty( $atts['id'] ) ? $atts['id'] : 0 );

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}

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/**

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* Handle Ted Shortcode.

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*

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* @param array $atts Shortcode attributes.

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*/

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function shortcode_ted( $atts ) {

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global $wp_embed;

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$defaults = array(

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'id' => '',

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'width' => '',

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'height' => '',

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'lang' => 'en',

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);

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$atts = shortcode_atts( $defaults, $atts, 'ted' );

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if ( empty( $atts['id'] ) ) {

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return '<!-- Missing TED ID -->';

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}

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$url = '';

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if ( preg_match( '#^[\d]+$#', $atts['id'], $matches ) ) {

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$url = 'https://ted.com/talks/view/id/' . $matches[0];

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} elseif ( preg_match( '#^https?://(www\.)?ted\.com/talks/view/id/[0-9]+$#', $atts['id'], $matches ) ) {

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$url = set_url_scheme( $matches[0], 'https' );

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}

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unset( $atts['id'] );

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$args = array();

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$embed_size_w = get_option( 'embed_size_w' );

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if ( is_numeric( $atts['width'] ) ) {

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$args['width'] = $atts['width'];

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} elseif ( $embed_size_w ) {

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$args['width'] = $embed_size_w;

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} elseif ( ! empty( $GLOBALS['content_width'] ) ) {

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$args['width'] = (int) $GLOBALS['content_width'];

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} else {

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$args['width'] = 500;

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}

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// Default to a 16x9 aspect ratio if there's no height set.

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if ( is_numeric( $atts['height'] ) ) {

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$args['height'] = $atts['height'];

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} else {

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$args['height'] = $args['width'] * 0.5625;

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}

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if ( ! empty( $atts['lang'] ) ) {

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$args['lang'] = sanitize_key( $atts['lang'] );

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add_filter( 'oembed_fetch_url', 'ted_filter_oembed_fetch_url', 10, 3 );

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}

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$retval = $wp_embed->shortcode( $args, $url );

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remove_filter( 'oembed_fetch_url', 'ted_filter_oembed_fetch_url', 10 );

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return $retval;

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}

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add_shortcode( 'ted', 'shortcode_ted' );

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/**

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* Filter the request URL to also include the $lang parameter

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*

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* @param string $provider URL of provider that supplies the tweet we're requesting.

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* @param string $url URL of tweet to embed.

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* @param array $args Parameters supplied to shortcode and passed to wp_oembed_get.

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*/

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function ted_filter_oembed_fetch_url( $provider, $url, $args ) {

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return add_query_arg( 'lang', $args['lang'], $provider );

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}

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/**

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* Filter the oembed html to set the sandbox attribute in the iframe

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*

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* @param string|false $cache The cached HTML result, stored in post meta.

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* @param string $url The attempted embed URL.

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*

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* @return string|false

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*/

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function ted_filter_oembed_amp_iframe( $cache, $url ) {

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if ( ! is_string( $cache ) ) {

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return $cache;

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}

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$host = wp_parse_url( $url, PHP_URL_HOST );

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if ( ! $host ) {

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return $cache;

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}

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$allowed_hosts = array(

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'ted.com',

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'www.ted.com',

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'embed.ted.com',

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);

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$host = strtolower( $host );

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if ( in_array( $host, $allowed_hosts, true ) ) {

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$cache = preg_replace(

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'/src=[\'"].*?[\'"]/',

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'$0 sandbox="allow-popups allow-scripts allow-same-origin"',

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$cache

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);

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}

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return $cache;

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}

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add_filter( 'embed_oembed_html', 'ted_filter_oembed_amp_iframe', 10, 2 );

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