问题
I'm trying to fetch events from a CalDAV server using Sardine (and biweekly). Fetching an entire calendar is working for me:
Sardine sardine = SardineFactory.begin();
InputStream is = sardine.get(CALDAV_URL_STRING);
ICalendar iCalendar = Biweekly.parse(is).first();
Now I would like to fetch events for specific time range. Based on this "Building a CalDAV client" article, I assume you should use Sardines report method to do so, right?
If so, how should you use that method? It's not documented in the wiki, and the Javadoc is also not very clear.
Should I write my own SardineReport? I looks like I should end up with something like:
Sardine sardine = SardineFactory.begin();
SardineReport<List<VEvent>> report = new MyRangeReport(FROM_DATE, END_DATE);
List<VEvent> result = sardine.report(CALDAV_URL_STRING, 1, report);
Am I on the right track? Does anyone have any pointers to how to write your own Sardine report?
回答1:
You are correct, to run a time range query you need to issue an HTTP REPORT
request containing a calendar-query
. You can find a sample in RFC 4719 Section 7.8.1. I don't know Sardine, but yes, report
sounds right ;-)
Simplified even further:
REPORT /bernard/work/ HTTP/1.1
Host: cal.example.com
Depth: 1
Content-Type: application/xml; charset="utf-8"
Content-Length: xxxx
<?xml version="1.0" encoding="utf-8" ?>
<calendar-query xmlns:D="DAV:" xmlns="urn:ietf:params:xml:ns:caldav">
<D:prop>
<D:getetag/>
<calendar-data />
</D:prop>
<filter>
<comp-filter name="VCALENDAR">
<comp-filter name="VEVENT">
<time-range start="20060104T000000Z" end="20060105T000000Z"/>
</comp-filter>
</comp-filter>
</filter>
</calendar-query>
Should I write my own SardineReport?
Looks like, scanning over the GitHub of Sardine it doesn't seem to include CalDAV queries. You can probably base yours on their SyncCollectionReport.java.
Note that the response to the calendar-query
REPORT
is just a regular WebDAV 207
multi-status
response. Nothing extra required. (the Result
object would be the same like in their SyncCollectionReport
but w/o the extra syncToken).
回答2:
I've implemented a report class which works, however, the result returned by Radicale seem to be incorrect. It looks like Radicale does not support the time-range
filter.
For what it's worth, here are the relevant bits of the report:
public class VEventsTimeRangeSardineReport extends SardineReport<List<VEvent>>
{
...
@Override
public String toXml() throws IOException
{
// Hardcode for now
String xml = "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n" +
"<c:calendar-query xmlns:d=\"DAV:\" xmlns:c=\"urn:ietf:params:xml:ns:caldav\">\n" +
" <d:prop>\n" +
" <c:calendar-data/>\n" +
" <d:getetag/>\n" +
" </d:prop>\n" +
" <c:filter>\n" +
" <c:comp-filter name=\"VCALENDAR\">\n" +
" <c:comp-filter name=\"VEVENT\">\n" +
" <c:time-range start=\"%s\" end=\"%s\"/>\n" +
" </c:comp-filter>\n" +
" </c:comp-filter>\n" +
" </c:filter>\n" +
"</c:calendar-query>";
return String.format(xml, SDF.format(fromDate), SDF.format(toDate));
}
@Override
public List<VEvent> fromMultistatus(Multistatus multistatus)
{
List<VEvent> events = new ArrayList<>(multistatus.getResponse().size());
for (Response response : multistatus.getResponse()) {
// Here response.getPropstat().get(0).getProp().getAny().get(0).getFirstChild().getTextContent() is parsed
events.addAll(ICalendarSardineReport.getICalendar(response).getEvents());
}
return events;
}
@Override
public Object toJaxb()
{
return null;
}
}
来源:https://stackoverflow.com/questions/38057038/using-sardines-report-method-to-query-events-from-caldav-server