Embed Any Document Shortcode

function embed_shortcode( $atts ) {
		$embed            = '';
		$durl             = '';
		$default_width    = $this->sanitize_dims( get_option( 'ead_width', '100%' ) );
		$default_height   = $this->sanitize_dims( get_option( 'ead_height', '100%' ) );
		$default_provider = get_option( 'ead_provider', 'google' );
		$default_download = get_option( 'ead_download', 'none' );
		$default_text     = get_option( 'ead_text', __( 'Download', 'embed-any-document' ) );
		$show             = false;
		$shortcode_atts   = shortcode_atts(
			array(
				'url'      => '',
				'drive'    => '',
				'width'    => $default_width,
				'height'   => $default_height,
				'language' => 'en',
				'text'     => $default_text,
				'viewer'   => $default_provider,
				'download' => $default_download,
				'cache'    => 'on',
			),
			$atts
		);

		wp_enqueue_style( 'awsm-ead-public' );
		wp_enqueue_script( 'awsm-ead-public' );

		if ( isset( $shortcode_atts['url'] ) && ! empty( $shortcode_atts['url'] ) ) :
			// AMP.
			$is_amp = function_exists( 'is_amp_endpoint' ) && is_amp_endpoint();

			$durl      = '';
			$viewer    = $shortcode_atts['viewer'];
			$providers = self::get_all_providers();

			if ( ! in_array( $viewer, $providers, true ) ) {
				$viewer                   = 'google';
				$shortcode_atts['viewer'] = 'google';
			}

			$is_browser_viewer = false;
			if ( $shortcode_atts['viewer'] === 'browser' ) {
				// fallback for Browser viewer.
				$is_browser_viewer = true;
				$viewer            = 'google';
				// AMP handling.
				if ( $is_amp ) {
					$is_browser_viewer = false;
				}
			}

			if ( $this->allowdownload( $shortcode_atts['viewer'] ) ) {
				if ( $shortcode_atts['download'] === 'alluser' || $shortcode_atts['download'] === 'all' ) {
					$show = true;
				} elseif ( $shortcode_atts['download'] === 'logged' && is_user_logged_in() ) {
					$show = true;
				}
			}
			$url = esc_url( $shortcode_atts['url'], array( 'http', 'https' ) );
			if ( $show ) {
				$filedata = wp_remote_head( $shortcode_atts['url'] );
				$filesize = 0;
				if ( ! is_wp_error( $filedata ) && isset( $filedata['headers']['content-length'] ) ) {
					$filesize = $this->human_filesize( $filedata['headers']['content-length'] );
				} else {
					$filesize = 0;
				}
				$file_html = '';
				if ( $filesize ) {
					$file_html = ' [' . $filesize . ']';
				}
				$durl = '<p class="embed_download"><a href="' . esc_url( $url ) . '" download >' . $shortcode_atts['text'] . $file_html . ' </a></p>';
			}

			if ( $shortcode_atts['cache'] === 'off' && $viewer === 'google' ) {
				if ( $this->url_get_param( $url ) ) {
					$url .= '?' . time();
				} else {
					$url .= '&' . time();
				}
			}

			$iframe_src = '';
			switch ( $viewer ) {
				case 'google':
					$embedsrc   = '//docs.google.com/viewer?url=%1$s&embedded=true&hl=%2$s';
					$iframe_src = sprintf( $embedsrc, rawurlencode( $url ), esc_attr( $shortcode_atts['language'] ) );
					break;

				case 'microsoft':
					$embedsrc   = '//view.officeapps.live.com/op/embed.aspx?src=%1$s';
					$iframe_src = sprintf( $embedsrc, rawurlencode( $url ) );
					break;
			}

			$iframe_style_attrs = array();
			$doc_style_attrs    = array(
				'position' => 'relative',
			);
			if ( $this->check_responsive( $shortcode_atts['height'] ) && $this->check_responsive( $shortcode_atts['width'] ) && ! $is_browser_viewer ) {
				$iframe_style_attrs = array(
					'width'    => '100%',
					'height'   => '100%',
					'border'   => 'none',
					'position' => 'absolute',
					'left'     => '0',
					'top'      => '0',
				);

				$doc_style_attrs['padding-top'] = '90%';
			} else {
				$iframe_style_attrs = array(
					'width'  => $shortcode_atts['width'],
					'height' => $shortcode_atts['height'],
					'border' => 'none',
				);
				if ( $this->in_percentage( $shortcode_atts['height'] ) ) {
					$iframe_style_attrs['min-height'] = '500px';
				}
			}

			$enable_preloader = ! $is_amp && $viewer === 'google';

			if ( $enable_preloader ) {
				$iframe_style_attrs['visibility'] = 'hidden';
			}

			$data_attr = '';
			if ( $is_browser_viewer ) {
				$data_attr = sprintf( ' data-pdf-src="%1$s" data-viewer="%2$s"', esc_url( $shortcode_atts['url'] ), esc_attr( $shortcode_atts['viewer'] ) );

				$doc_style_attrs = array_merge( $doc_style_attrs, $iframe_style_attrs );
				unset( $doc_style_attrs['visibility'] );
			}

			$iframe_style = self::build_style_attr( $iframe_style_attrs );
			$iframe       = sprintf( '<iframe src="%s" title="%s" class="ead-iframe" %s></iframe>', esc_attr( $iframe_src ), esc_html__( 'Embedded Document', 'embed-any-document' ), $iframe_style );

			if ( $enable_preloader ) {
				$iframe = '<div class="ead-iframe-wrapper">' . $iframe . '</div>' . self::get_iframe_preloader( $shortcode_atts );
			}

			$doc_style = self::build_style_attr( $doc_style_attrs );
			$embed     = sprintf( '<div class="ead-preview"><div class="ead-document" %3$s>%1$s</div>%2$s</div>', $iframe, $durl, $doc_style . $data_attr );
		else :
			$embed = esc_html__( 'No Url Found', 'embed-any-document' );
		endif;

		/**
		 * Customize the embedded content.
		 *
		 * @since 2.6.0
		 *
		 * @param string $embed The embedded content.
		 * @param array $shortcode_atts The shortcode attributes.
		 */
		$embed = apply_filters( 'awsm_ead_content', $embed, $shortcode_atts );

		return $embed;
	}