private boolean discoverCalendars()

in openmeetings-service/src/main/java/org/apache/openmeetings/service/calendar/caldav/AppointmentManager.java [271:411]
108 lines of code
25 McCabe index (conditional complexity)

	private boolean discoverCalendars(HttpClient client, HttpClientContext context, OmCalendar calendar) {
		cleanupIdleConnections();

		if (calendar.getSyncType() != SyncType.NONE) {
			return false;
		}
		HttpPropfind propFindMethod = null;
		String userPath = null, homepath = null;

		DavPropertyName curUserPrincipal = DavPropertyName.create("current-user-principal"),
				calHomeSet = DavPropertyName.create("calendar-home-set", CalDAVConstants.NAMESPACE_CALDAV),
				suppCalCompSet = DavPropertyName.create("supported-calendar-component-set", CalDAVConstants.NAMESPACE_CALDAV);

		//Find out whether it's a calendar or if we can find the calendar-home or current-user url
		try {
			String path = calendar.getHref();

			DavPropertyNameSet properties = new DavPropertyNameSet();
			properties.add(curUserPrincipal);
			properties.add(calHomeSet);
			properties.add(DavPropertyName.RESOURCETYPE);

			propFindMethod = new HttpPropfind(path, properties, CalDAVConstants.DEPTH_0);
			HttpResponse httpResponse = client.execute(propFindMethod, context);

			if (!propFindMethod.succeeded(httpResponse)) {
				return false;
			}
			for (MultiStatusResponse response : propFindMethod.getResponseBodyAsMultiStatus(httpResponse).getResponses()) {
				DavPropertySet set = response.getProperties(SC_OK);
				DavProperty<?> calhome = set.get(calHomeSet), curPrinci = set.get(curUserPrincipal),
						resourcetype = set.get(DavPropertyName.RESOURCETYPE);

				if (checkCalendarResourceType(resourcetype)) {
					//This is a calendar and thus initialize and return
					return initCalendar(client, context, calendar);
				}

				//Else find all the calendars on the Principal and return.
				if (calhome != null) {
					//Calendar Home Path
					homepath = getTextValuefromProperty(calhome);
					break;
				} else if (curPrinci != null) {
					//Current User Principal Path
					userPath = getTextValuefromProperty(curPrinci);
					break;
				}
			}

			if (homepath == null && userPath != null) {
				//If calendar home path wasn't set, then we get it
				DavPropertyNameSet props = new DavPropertyNameSet();
				props.add(calHomeSet);
				propFindMethod = new HttpPropfind(userPath, props, DavConstants.DEPTH_0);
				httpResponse = client.execute(propFindMethod, context);

				if (!propFindMethod.succeeded(httpResponse)) {
					return false;
				}
				for (MultiStatusResponse response : propFindMethod.getResponseBodyAsMultiStatus(httpResponse).getResponses()) {
					DavPropertySet set = response.getProperties(SC_OK);
					DavProperty<?> calhome = set.get(calHomeSet);

					if (calhome != null) {
						homepath = getTextValuefromProperty(calhome);
						break;
					}
				}
			}

			if (homepath != null) {
				DavPropertyNameSet props = new DavPropertyNameSet();
				props.add(DavPropertyName.RESOURCETYPE);
				props.add(suppCalCompSet);
				props.add(DavPropertyName.DISPLAYNAME);

				propFindMethod = new HttpPropfind(homepath, props, DavConstants.DEPTH_1);

				httpResponse = client.execute(propFindMethod, context);

				if (propFindMethod.succeeded(httpResponse)) {
					boolean success = false;

					URI resourceUri = propFindMethod.getURI();
					String host = resourceUri.getScheme() + "://" + resourceUri.getHost() + ((resourceUri.getPort() != -1)? ":" + resourceUri.getPort() : "");
					for (MultiStatusResponse response : propFindMethod.getResponseBodyAsMultiStatus(httpResponse).getResponses()) {
						boolean isVevent = false, isCalendar;

						DavPropertySet set = response.getProperties(SC_OK);
						DavProperty<?> p = set.get(suppCalCompSet),
								resourcetype = set.get(DavPropertyName.RESOURCETYPE),
								displayname = set.get(DavPropertyName.DISPLAYNAME);

						isCalendar = checkCalendarResourceType(resourcetype);

						if (p != null) {
							for (Object o : (Collection<?>) p.getValue()) {
								if (o instanceof Element e) {
									String name = DomUtil.getAttribute(e, "name", null);
									if ("VEVENT".equals(name)) {
										isVevent = true;
									}
								}
							}
						}

						if (isCalendar && isVevent) {
							success = true;
							//Get New Calendar
							OmCalendar tempCalendar = new OmCalendar();

							if (displayname != null) {
								tempCalendar.setTitle(displayname.getValue().toString());
							}

							tempCalendar.setHref(host + response.getHref());

							tempCalendar.setDeleted(false);
							tempCalendar.setOwner(calendar.getOwner());

							calendarDao.update(tempCalendar);
							initCalendar(client, context, tempCalendar);
						}
					}
					return success;
				}
			}

		} catch (IOException e) {
			log.error("Error executing PROPFIND Method, during testConnection.", e);
		} catch (Exception e) {
			log.error("Severe Error in executing PROPFIND Method, during testConnection.", e);
		} finally {
			if (propFindMethod != null) {
				propFindMethod.reset();
			}
		}

		return false;
	}