<?php
/**
* Slideshare shortcode
*
* Formats:
* Old style (still compatible): [slideshare id=5342235&doc=camprock-101002163655-phpapp01&w=300&h=200]
* New style: [slideshare id=5342235&w=300&h=200&fb=0&mw=0&mh=0&sc=no]
*
* Legend:
* id = Document ID provided by Slideshare
* w = Width of iFrame (int)
* h = Height of iFrame (int)
* fb = iFrame frameborder (int)
* mw = iFrame marginwidth (int)
* mh = iFrame marginheight (int)
* sc = iFrame Scrollbar (yes/no)
* pro = Slideshare Pro (yes/no)
* style = Inline CSS (string)
*
* @package automattic/jetpack
*/
/**
* Register and display shortcode.
*
* @param array $atts Shortcode attributes.
*/
function slideshare_shortcode( $atts ) {
global $content_width;
$params = shortcode_new_to_old_params( $atts );
parse_str( $params, $arguments );
if ( empty( $arguments ) ) {
return '<!-- SlideShare error: no arguments -->';
}
$attr = shortcode_atts(
array(
'id' => '',
'w' => '',
'h' => '',
'fb' => '',
'mw' => '',
'mh' => '',
'sc' => '',
'pro' => '',
'style' => '',
),
$arguments
);
// check that the Slideshare ID contains letters, numbers and query strings.
$pattern = '/[^-_a-zA-Z0-9?=&]/';
if ( empty( $attr['id'] ) || preg_match( $pattern, $attr['id'] ) ) {
return '<!-- SlideShare error: id is missing or has illegal characters -->';
}
// check the width/height.
$w = (int) $attr['w'];
// If no width was specified (or uses the wrong format), and if we have a $content_width, use that.
if ( empty( $w ) && ! empty( $content_width ) ) {
$w = (int) $content_width;
} elseif ( $w < 300 || $w > 1600 ) { // If width was specified, but is too small/large, set default value.
$w = 425;
} else {
$w = (int) $w;
}
$h = ceil( $w * 348 / 425 ); // Note: user-supplied height is ignored.
if ( ! empty( $attr['pro'] ) ) {
$source = 'https://www.slideshare.net/slidesharepro/' . $attr['id'];
} else {
$source = 'https://www.slideshare.net/slideshow/embed_code/' . $attr['id'];
}
if ( isset( $attr['rel'] ) ) {
$source = add_query_arg( 'rel', (int) $attr['rel'], $source );
}
if ( ! empty( $attr['startSlide'] ) ) {
$source = add_query_arg( 'startSlide', (int) $attr['startSlide'], $source );
}
$player = sprintf( "<iframe src='%s' width='%d' height='%d'", esc_url( $source ), $w, $h );
// check the frameborder.
if ( ! empty( $attr['fb'] ) || '0' === $attr['fb'] ) {
$player .= " frameborder='" . (int) $attr['fb'] . "'";
}
$is_amp = ( class_exists( 'Jetpack_AMP_Support' ) && Jetpack_AMP_Support::is_amp_request() );
if ( ! $is_amp ) {
// check the margin width; if not empty, cast as int.
if ( ( ! empty( $attr['mw'] ) || '0' === $attr['mw'] ) ) {
$player .= " marginwidth='" . (int) $attr['mw'] . "'";
}
// check the margin height, if not empty, cast as int.
if ( ( ! empty( $attr['mh'] ) || '0' === $attr['mh'] ) ) {
$player .= " marginheight='" . (int) $attr['mh'] . "'";
}
}
if ( ! empty( $attr['style'] ) ) {
$player .= " style='" . esc_attr( $attr['style'] ) . "'";
}
// check the scrollbar; cast as a lowercase string for comparison.
if ( ! empty( $attr['sc'] ) ) {
$sc = strtolower( $attr['sc'] );
if ( in_array( $sc, array( 'yes', 'no' ), true ) ) {
$player .= " scrolling='" . $sc . "'";
}
}
$player .= ' sandbox="allow-popups allow-scripts allow-same-origin allow-presentation" allowfullscreen webkitallowfullscreen mozallowfullscreen></iframe>';
/**
* Filter the returned SlideShare shortcode.
*
* @module shortcodes
*
* @since 4.7.0
*
* @param string $player The iframe to return.
* @param array $atts The attributes specified in the shortcode.
*/
return apply_filters( 'jetpack_slideshare_shortcode', $player, $atts );
}
add_shortcode( 'slideshare', 'slideshare_shortcode' );