Google Doc Embedder Shortcode

function gde_do_shortcode( $atts ) {
	global $gdeoptions;

	extract( shortcode_atts( array (
		'file' => '',
		'profile' => 1, // default profile is always ID 1
		'save' => '',
		'width' => '',
		'height' => ''
	), $atts ) );
	
	// get requested profile data (or default if doesn't exist)
	$term = $profile;
	if ( is_numeric( $term ) ) {
		// id-based lookup
		if ( ! $profile = gde_get_profiles( $term ) ) {
			gde_dx_log("Loading default profile instead");
			if ( ! $profile = gde_get_profiles( 1 ) ) {
				return gde_show_error( __('Unable to load requested profile.', 'google-document-embedder') );
			} else {
				$pid = 1;
			}
		} else {
			$pid = $term;
		}
	} else {
		// name-based lookup
		if ( ! $profile = gde_get_profiles( strtolower( $term ) ) ) {
			gde_dx_log("Loading default profile instead");
			if ( ! $profile = gde_get_profiles( 1 ) ) {
				return gde_show_error( __('Unable to load requested profile.', 'google-document-embedder') );
			} else {
				$pid = 1;
			}
		} else {
			$pid = $profile['profile_id'];
		}
	}
	
	// use profile defaults if shortcode override not defined
	if ( $save !== "0" ) {
		if ( empty( $save ) ) {
			$save = $profile['link_show'];
		}
	}

	if ( empty( $width ) ) {
		$width = $profile['default_width'];
	}
	if ( empty( $height ) ) {
		$height = $profile['default_height'];
	}
	$lang =  $profile['language'];

	// tweak the dimensions if necessary
	$width = gde_sanitize_dims( $width );
	$height = gde_sanitize_dims( $height );
	
	// add base url if needed
	if ( ! preg_match( "/^http/i", $file ) ) {
		if ( substr( $file, 0, 2 ) == "//" ) {
			// append dynamic protocol
			if ( ! empty( $_SERVER['HTTPS'] ) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443 ) {
				$file = "https:" . $file;
			} else {
				$file = "http:" . $file;
			}
		} elseif ( isset( $profile['base_url'] ) ) {
			// not a full link, add base URL if available
			if ( substr( $file, 0, 1 ) == "/" ) {
				// remove any preceding slash from doc (base URL adds it)
				$file = ltrim( $file, '/' );
			}
			$file = $profile['base_url'] . $file;
		}
	}
	
	// capture file details
	$fn = basename( $file );
	$fnp = gde_split_filename( $fn );
	
	// check for missing required field
	if ( ! $file ) {
		return gde_show_error( __('File not specified, check shortcode syntax', 'google-document-embedder') );
	}
	
	// file validation
	if ( $gdeoptions['error_check'] == "no" ) {
		$force = true;
	} else {
		$force = false;
	}
	$status = gde_validate_file( str_replace( " ", "%20", $file ), $force );
	
	if ( ! isset( $code ) && ! is_array( $status ) && $status !== -1 ) {
		// validation failed
		$code = gde_show_error( $status );
	} elseif ( ! isset( $code ) ) {
		// validation passed or was skipped
		
		// check for max filesize
		$viewer = true;
		if ( $gdeoptions['file_maxsize'] > 0 && isset( $status['fsize'] ) ) {
			$maxbytes = (int) $gdeoptions['file_maxsize'] * 1024 * 1024;
			if ( $status['fsize'] > $maxbytes ) {
				$viewer = false;
			}
		}
		
		// check for failed secure doc
		if ( empty( $file ) ) {
			$code = gde_show_error( __('File name is empty', 'google-document-embedder') );
		} else {
		
			// which viewer?

			$lnk = "//docs.google.com/viewer?url=" . urlencode( $file  ) . "&hl=" . urlencode($lang);

			$lnk .= "&embedded=true";

			// build viewer
			if ( $viewer == false ) {
				// exceeds max filesize
				$vwr = '';
			} else {
				$vwr = '<iframe src="%U%" class="gde-frame" style="width:%W%; height:%H%; border: none;" scrolling="no"></iframe>';
				$vwr = str_replace("%U%", $lnk, $vwr);
				$vwr = str_replace("%W%", esc_attr($width), $vwr);
				$vwr = str_replace("%H%", esc_attr($height), $vwr);
			}
			
			// show download link?
			$allow_save = false;
			if ( $save == "all" || $save == "1" ) {
				$allow_save = true;
			} elseif ( $save == "users" && is_user_logged_in() ) {
				$allow_save = true;
			}

			if ( $allow_save ) {
				// build download link
				$linkcode = '<p class="gde-text"><a href="%LINK%" class="gde-link"%ATTRS%>%TXT%</a></p>';
				$linkcode = str_replace( "%LINK%", $file, $linkcode );
				
				// fix type
				$ftype = strtoupper( $fnp[1] );
				if ( $ftype == "TIF" ) { 
					$ftype = "TIFF";
				}
				
				// link attributes
				$attr[] = gde_ga_event( $file ); // GA integration
				$linkcode = str_replace("%ATTRS%", implode( '', $attr ), $linkcode);
				
				// link text
				if ( empty( $profile['link_text'] ) ) {
					$profile['link_text'] = __('Download', 'google-document-embedder');
				}
				
				$dltext = str_replace( "%FILE", $fn, $profile['link_text'] );
				$dltext = str_replace( "%TYPE", $ftype, $dltext );
				$dltext = str_replace( "%SIZE", gde_format_bytes( $status['fsize'] ), $dltext );
				
				$linkcode = str_replace( "%TXT%", $dltext, $linkcode );
			} else {
				$linkcode = '';
			}
			
			// link position
			if ( $profile['link_pos'] == "above" ) {
				$code = $linkcode . "\n" . $vwr;
			} else {
				$code = $vwr . "\n" . $linkcode;
			}
		}
	}
	
	return $code;
}