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Editing: spotify.php

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<?php
/**
 * Spotify shortcode.
 *
 * Usage:
 * [spotify id="spotify:track:4bz7uB4edifWKJXSDxwHcs" width="400" height="100"]
 */

if ( ! shortcode_exists( 'spotify' ) ) {
	add_shortcode( 'spotify', 'jetpack_spotify_shortcode' );

if ( get_option( 'embed_autourls' ) ) {
		// If user enabled autourls, also convert syntax like spotify:track:4bz7uB4edifWKJXSDxwHcs
		add_filter( 'the_content', 'jetpack_spotify_embed_ids', 7 );
	}
}

/**
 * Parse shortcode arguments and render its output.
 *
 * @since 4.5.0
 *
 * @param array  $atts
 * @param string $content
 *
 * @return string
 */
function jetpack_spotify_shortcode( $atts = array(), $content = '' ) {

if ( ! empty( $content ) ) {
		$id = $content;
	} elseif ( ! empty( $atts['id'] ) ) {
		$id = $atts['id'];
	} elseif ( ! empty( $atts[0] ) ) {
		$id = $atts[0];
	} else {
		return '';
	}

if ( empty( $atts['width'] ) ) {
		$atts['width'] = 300;
	}

if ( empty( $atts['height'] ) ) {
		$atts['height'] = 380;
	}

$atts['width']  = (int) $atts['width'];
	$atts['height'] = (int) $atts['height'];

// Spotify accepts both URLs and their Spotify ID format, so let them sort it out and validate
	$embed_url = add_query_arg( 'uri', urlencode( $id ), 'https://embed.spotify.com/' );

return '<iframe src="' . esc_url( $embed_url ) . '" style="display:block; margin:0 auto; width:' . esc_attr( $atts['width'] ) . 'px; height:' . esc_attr( $atts['height'] ) . 'px;" frameborder="0" allowtransparency="true"></iframe>';
}

/**
 * Turn text like this on it's own line into an embed: spotify:track:4bz7uB4edifWKJXSDxwHcs
 * The core WordPress embed functionality only works with URLs
 * Modified version of WP_Embed::autoembed()
 *
 * @since 4.5.0
 *
 * @param $content
 *
 * @return string
 */
function jetpack_spotify_embed_ids( $content ) {
	$textarr = wp_html_split( $content );

foreach ( $textarr as &$element ) {
		if ( '' == $element || '<' === $element[0] ) {
			continue;
		}

if ( substr( ltrim( $element ), 0, 8 ) !== 'spotify:' ) {
			continue;
		}

$element = preg_replace_callback( '|^\s*(spotify:[^\s"]+:[^\s"]+)\s*$|im', 'jetpack_spotify_embed_ids_callback', $element );
	}

return implode( '', $textarr );
}

/**
 * Call shortcode with ID provided by matching pattern.
 *
 * @since 4.5.0
 *
 * @param array $matches
 *
 * @return string
 */
function jetpack_spotify_embed_ids_callback( $matches ) {
	return "\n" . jetpack_spotify_shortcode( array(), $matches[1] ) . "\n";
}

Editing: spotify.php

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