/**
* Processes the request and returns a response. Calls {@link
* DavResourceFactory.createResource(DavResourceLocator, DavRequest, DavResponse)} to find the
* targeted resource. Calls {@link #preconditions(DavRequest, DavResponse, DavResource)} to verify
* preconditions. Calls {@link #process(DavRequest, DavResponse, DavResource)} to execute the
* verified request.
*
* <p>Invalid preconditions and processing exceptions are handled by sending a response with the
* appropriate error status and message and an entity describing the error.
*/
public void handleRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
DavRequest wreq = null;
DavResponse wres = null;
try {
wreq = createDavRequest(request);
wres = createDavResponse(response);
DavResource resource = resolveTarget(wreq);
preconditions(wreq, wres, resource);
process(wreq, wres, resource);
} catch (CosmoSecurityException e) {
// handle security errors
NeedsPrivilegesException npe = null;
// Determine required privilege if we can and include
// in response
if (e instanceof ItemSecurityException) {
ItemSecurityException ise = (ItemSecurityException) e;
DavPrivilege priv =
ise.getPermission() == Permission.READ ? DavPrivilege.READ : DavPrivilege.WRITE;
npe = new NeedsPrivilegesException(wreq.getRequestURI(), priv);
} else {
// otherwise send generic response
npe = new NeedsPrivilegesException(e.getMessage());
}
wres.sendDavError(npe);
} catch (Throwable e) {
DavException de = null;
if (e instanceof DavException) {
de = (DavException) e;
} else {
de = new DavException(e);
// stuff the exception into a request attribute so that
// filters can examine it
request.setAttribute(ATTR_SERVICE_EXCEPTION, e);
}
if (de.getErrorCode() >= 500) log.error("Internal dav error", e);
else if (de.getErrorCode() >= 400 && de.getMessage() != null)
log.info("Client error (" + de.getErrorCode() + "): " + de.getMessage());
wres.sendDavError(de);
}
}
private void ifMatch(DavRequest request, DavResponse response, DavResource resource)
throws DavException, IOException {
EntityTag[] requestEtags = request.getIfMatch();
if (requestEtags.length == 0) return;
EntityTag resourceEtag = etag(resource);
if (resourceEtag == null) return;
if (EntityTag.matchesAny(resourceEtag, requestEtags)) return;
if (resourceEtag != null) response.setHeader("ETag", resourceEtag.toString());
throw new PreconditionFailedException("If-Match disallows conditional request");
}
private void ifUnmodifiedSince(DavRequest request, DavResponse response, DavResource resource)
throws DavException, IOException {
if (resource == null) return;
long mod = resource.getModificationTime();
if (mod == -1) return;
mod = mod / 1000 * 1000;
long since = request.getDateHeader("If-Unmodified-Since");
if (since == -1) return;
if (mod <= since) return;
throw new PreconditionFailedException("If-Unmodified-Since disallows conditional request");
}
private void ifModifiedSince(DavRequest request, DavResponse response, DavResource resource)
throws DavException, IOException {
if (resource == null) return;
long mod = resource.getModificationTime();
if (mod == -1) return;
mod = mod / 1000 * 1000;
long since = request.getDateHeader("If-Modified-Since");
if (since == -1) return;
if (mod > since) return;
throw new NotModifiedException();
}
private void ifNoneMatch(DavRequest request, DavResponse response, DavResource resource)
throws DavException, IOException {
EntityTag[] requestEtags = request.getIfNoneMatch();
if (requestEtags.length == 0) return;
EntityTag resourceEtag = etag(resource);
if (resourceEtag == null) return;
if (!EntityTag.matchesAny(resourceEtag, requestEtags)) return;
if (resourceEtag != null) response.addHeader("ETag", resourceEtag.toString());
if (deservesNotModified(request)) throw new NotModifiedException();
else throw new PreconditionFailedException("If-None-Match disallows conditional request");
}
private boolean deservesNotModified(DavRequest request) {
return (request.getMethod().equals("GET") || request.getMethod().equals("HEAD"));
}
/**
* Creates an instance of <code>DavResource</code> representing the resource targeted by the
* request.
*/
protected DavResource resolveTarget(DavRequest request) throws DavException {
return resourceFactory.resolve(request.getResourceLocator(), request);
}
/**
* Hands the request off to a provider method for handling. The provider is created by calling
* {@link #createProvider(DavResource)}. The specific provider method is chosen by examining the
* request method.
*/
protected void process(DavRequest request, DavResponse response, DavResource resource)
throws IOException, DavException {
DavProvider provider = createProvider(resource);
if (request.getMethod().equals("OPTIONS")) options(request, response, resource);
else if (request.getMethod().equals("GET")) provider.get(request, response, resource);
else if (request.getMethod().equals("HEAD")) provider.head(request, response, resource);
else if (request.getMethod().equals("PROPFIND")) provider.propfind(request, response, resource);
else if (request.getMethod().equals("PROPPATCH"))
provider.proppatch(request, response, resource);
else if (request.getMethod().equals("DELETE")) provider.delete(request, response, resource);
else if (request.getMethod().equals("COPY")) provider.copy(request, response, resource);
else if (request.getMethod().equals("MOVE")) provider.move(request, response, resource);
else if (request.getMethod().equals("REPORT")) provider.report(request, response, resource);
else if (request.getMethod().equals("MKTICKET")) provider.mkticket(request, response, resource);
else if (request.getMethod().equals("DELTICKET"))
provider.delticket(request, response, resource);
else if (request.getMethod().equals("ACL")) provider.acl(request, response, resource);
else {
if (resource.isCollection()) {
if (request.getMethod().equals("MKCOL"))
provider.mkcol(request, response, (DavCollection) resource);
else if (request.getMethod().equals("MKCALENDAR"))
provider.mkcalendar(request, response, (DavCollection) resource);
else
throw new MethodNotAllowedException(
request.getMethod() + " not allowed for a collection");
} else {
if (request.getMethod().equals("PUT"))
provider.put(request, response, (DavContent) resource);
else
throw new MethodNotAllowedException(
request.getMethod() + " not allowed for a non-collection resource");
}
}
}
