<?php

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/**

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* Slideshare shortcode

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*

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* Formats:

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* Old style (still compatible): [slideshare id=5342235&doc=camprock-101002163655-phpapp01&w=300&h=200]

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* New style: [slideshare id=5342235&w=300&h=200&fb=0&mw=0&mh=0&sc=no]

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*

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* Legend:

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* id = Document ID provided by Slideshare

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* w = Width of iFrame (int)

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* h = Height of iFrame (int)

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* fb = iFrame frameborder (int)

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* mw = iFrame marginwidth (int)

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* mh = iFrame marginheight (int)

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* sc = iFrame Scrollbar (yes/no)

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* pro = Slideshare Pro (yes/no)

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* style = Inline CSS (string)

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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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/**

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* Register and display shortcode.

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*

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* @param array $atts Shortcode attributes.

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*/

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function slideshare_shortcode( $atts ) {

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global $content_width;

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$params = shortcode_new_to_old_params( $atts );

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parse_str( $params, $arguments );

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if ( empty( $arguments ) ) {

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return '<!-- SlideShare error: no arguments -->';

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}

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$attr = shortcode_atts(

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array(

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'id' => '',

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'w' => '',

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'h' => '',

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'fb' => '',

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'mw' => '',

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'mh' => '',

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'sc' => '',

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'pro' => '',

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'style' => '',

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),

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$arguments

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);

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// check that the Slideshare ID contains letters, numbers and query strings.

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$pattern = '/[^-_a-zA-Z0-9?=&]/';

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if ( empty( $attr['id'] ) || preg_match( $pattern, $attr['id'] ) ) {

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return '<!-- SlideShare error: id is missing or has illegal characters -->';

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}

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// check the width/height.

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$w = (int) $attr['w'];

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// If no width was specified (or uses the wrong format), and if we have a $content_width, use that.

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if ( empty( $w ) && ! empty( $content_width ) ) {

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$w = (int) $content_width;

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} elseif ( $w < 300 || $w > 1600 ) { // If width was specified, but is too small/large, set default value.

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$w = 425;

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} else {

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$w = (int) $w;

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}

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$h = ceil( $w * 348 / 425 ); // Note: user-supplied height is ignored.

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if ( ! empty( $attr['pro'] ) ) {

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$source = 'https://www.slideshare.net/slidesharepro/' . $attr['id'];

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} else {

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$source = 'https://www.slideshare.net/slideshow/embed_code/' . $attr['id'];

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}

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if ( isset( $attr['rel'] ) ) {

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$source = add_query_arg( 'rel', (int) $attr['rel'], $source );

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}

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if ( ! empty( $attr['startSlide'] ) ) {

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$source = add_query_arg( 'startSlide', (int) $attr['startSlide'], $source );

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}

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$player = sprintf( "<iframe src='%s' width='%d' height='%d'", esc_url( $source ), $w, $h );

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// check the frameborder.

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if ( ! empty( $attr['fb'] ) || '0' === $attr['fb'] ) {

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$player .= " frameborder='" . (int) $attr['fb'] . "'";

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}

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$is_amp = ( class_exists( 'Jetpack_AMP_Support' ) && Jetpack_AMP_Support::is_amp_request() );

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if ( ! $is_amp ) {

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// check the margin width; if not empty, cast as int.

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if ( ( ! empty( $attr['mw'] ) || '0' === $attr['mw'] ) ) {

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$player .= " marginwidth='" . (int) $attr['mw'] . "'";

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}

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// check the margin height, if not empty, cast as int.

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if ( ( ! empty( $attr['mh'] ) || '0' === $attr['mh'] ) ) {

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$player .= " marginheight='" . (int) $attr['mh'] . "'";

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}

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}

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if ( ! empty( $attr['style'] ) ) {

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$player .= " style='" . esc_attr( $attr['style'] ) . "'";

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}

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// check the scrollbar; cast as a lowercase string for comparison.

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if ( ! empty( $attr['sc'] ) ) {

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$sc = strtolower( $attr['sc'] );

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if ( in_array( $sc, array( 'yes', 'no' ), true ) ) {

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$player .= " scrolling='" . $sc . "'";

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}

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}

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$player .= ' sandbox="allow-popups allow-scripts allow-same-origin allow-presentation" allowfullscreen webkitallowfullscreen mozallowfullscreen></iframe>';

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/**

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* Filter the returned SlideShare shortcode.

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*

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* @module shortcodes

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*

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* @since 4.7.0

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*

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* @param string $player The iframe to return.

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* @param array $atts The attributes specified in the shortcode.

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*/

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return apply_filters( 'jetpack_slideshare_shortcode', $player, $atts );

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}

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add_shortcode( 'slideshare', 'slideshare_shortcode' );

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