added URL to ical

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

de.srsoftware.cal.api/src/main/java/de/srsoftware/cal/api/Appointment.java

@@ -39,9 +39,10 @@ public interface Appointment {
 	/**
 	 * represent this event as ical entry
 	 * @param calendarIdentifier used to generate a unique id. pass something that is unique, but stable over time, e.g. a hostname
+	 * @param urlTemplate the url to put into the ical, with "{}" being replaced by the appointment id
 	 * @return the ical string
 	 */
-	String ical(String calendarIdentifier);
+	String ical(String calendarIdentifier,String urlTemplate);
 
 	/**
 	 * ID of the appointment – unique within this system

de.srsoftware.cal.base/src/main/java/de/srsoftware/cal/BaseAppointment.java

@@ -125,7 +125,7 @@ public class BaseAppointment implements Appointment {
 	}
 
 	@Override
-	public String ical(String calendarIdentifier) { // TODO: implement
+	public String ical(String calendarIdentifier,String urlTemplate) { // TODO: implement
 		var sb = new StringBuilder();
 		sb.append(contentLine(BEGIN,VEVENT));
 		if (calendarIdentifier != null) sb.append(contentLine(UID,"%s@%s".formatted(id(),calendarIdentifier)));
@@ -133,6 +133,7 @@ public class BaseAppointment implements Appointment {
 		end().map(end -> contentLine(DTEND,end.format(ICAL_DATE_FORMAT).replace(" ","T"))).ifPresent(sb::append);
 		sb.append(contentLine(SUMMARY,title()));
 		sb.append(contentLine(DESCRIPTION,description()));
+		sb.append(contentLine(URL,urlTemplate.replace("{}",""+id())));
 		coords().map(Coords::icalFormat).map(geo -> contentLine(GEO,geo)).ifPresent(sb::append);
 		location().map(loc -> contentLine(LOCATION,loc)).ifPresent(sb::append);
 		for (var attachment : attachments()) sb.append(contentLine("ATTACH;FMTYPE=%s".formatted(attachment.mime()),attachment.url().toString()));

de.srsoftware.cal.base/src/main/java/de/srsoftware/cal/Util.java

@@ -36,6 +36,7 @@ public class Util {
 	public static final String PRODID = "PRODID";
 	public static final String SUMMARY = "SUMMARY";
 	public static final String UID = "UID";
+	public static final String URL = "URL";
 	public static final String VERSION = "VERSION";
 	public static final String VEVENT = "VEVENT";
 	public static final String VCALENDAR = "VCALENDAR";

de.srsoftware.cal.web/src/main/java/de/srsoftware/cal/ApiEndpoint.java

@@ -91,12 +91,13 @@ public class ApiEndpoint extends PathHandler {
 
 	@Override
 	public boolean doGet(String path, HttpExchange ex) throws IOException {
-		String hostname = hostname(ex).split("://",2)[1];
+		String hostname = hostname(ex);
-		String prodId = "OpenCloudCal@"+hostname;
+		String urlTemplate = hostname+"/static/event?id={}";
+		String prodId = "OpenCloudCal@"+hostname.split("://",2)[1];
 		return switch (path) {
 			case "/event" -> sendContent(ex,getEvent(ex).map(ApiEndpoint::toJson).map(ApiEndpoint::httpError));
-			case "/event/ical"-> sendContent(ex,getEvent(ex).map(event -> toIcal(event,hostname)).map(ical -> Util.wrapIcal(ical,prodId)).map(ApiEndpoint::httpError));
+			case "/event/ical"-> sendContent(ex,getEvent(ex).map(event -> toIcal(event, hostname, urlTemplate)).map(ical -> Util.wrapIcal(ical,prodId)).map(ApiEndpoint::httpError));
-			case "/events/ical"-> sendContent(ex,eventList(ex).map(list -> toIcalList(list,hostname)).map(ical -> Util.wrapIcal(ical,prodId)).map(ApiEndpoint::httpError));
+			case "/events/ical"-> sendContent(ex,eventList(ex).map(list -> toIcalList(list, hostname, urlTemplate)).map(ical -> Util.wrapIcal(ical,prodId)).map(ApiEndpoint::httpError));
 			case "/events/json" -> sendContent(ex,eventList(ex).map(ApiEndpoint::toJsonList).map(ApiEndpoint::httpError));
             case "/tags" -> listTags(ex);
             default -> unknownPath(ex, path);
@@ -265,15 +266,15 @@ public class ApiEndpoint extends PathHandler {
 		return Payload.of(event);
 	}
 
-	private static Result<String> toIcal(Result<Appointment> res, String hostname) {
+	private static Result<String> toIcal(Result<Appointment> res, String hostname, String urlTemplate) {
 		var opt = res.optional();
-		return opt.isEmpty() ? transform(res) : Payload.of(opt.get().ical(hostname));
+		return opt.isEmpty() ? transform(res) : Payload.of(opt.get().ical(hostname, urlTemplate));
 	}
 
-	private static Result<String> toIcalList(Result<List<Appointment>> res, String hostname) {
+	private static Result<String> toIcalList(Result<List<Appointment>> res, String hostname, String urlTemplate) {
 		var opt = res.optional();
 		if (opt.isEmpty()) return transform(res);
-		var list = opt.get().stream().map(event -> event.ical(hostname)).collect(Collectors.joining("\n"));
+		var list = opt.get().stream().map(event -> event.ical(hostname, urlTemplate)).collect(Collectors.joining("\n"));
 		return Payload.of(list);
 	}