public async Task <bool> PreconditionsOK(Dictionary <string, string> propertiesAndHeaders, HttpResponse response)
{
#region Extracting Properties
var url = propertiesAndHeaders["url"];
var contentSize = propertiesAndHeaders["content-length"];
var body = propertiesAndHeaders["body"];
VCalendar iCalendar;
try
{
iCalendar = new VCalendar(body); //lo que no estoy seguro que en el body solo haya el iCal string
}
catch (Exception)
{
response.StatusCode = (int)HttpStatusCode.BadRequest;
return(false);
}
#endregion
//check that resourceId don't exist but the collection does.
if (
!StorageManagement.ExistCalendarCollection(url.Remove(url.LastIndexOf("/", StringComparison.Ordinal) + 1)))
{
response.StatusCode = (int)HttpStatusCode.NotFound;
return(false);
}
//check that if the resource exist then all its components different of VTIMEZONE has to have the same UID
//if the resource not exist can not be another resource with the same uid.
if (!StorageManagement.ExistCalendarObjectResource(url))
{
var component = iCalendar.CalendarComponents.FirstOrDefault(comp => comp.Key != "VTIMEZONE").Value;
var uid = component.FirstOrDefault()?.Properties["UID"].StringValue;
// var resource = db.GetCalendarResource(userEmail, collectionName, calendarResourceId);
var collection =
_collectionRepository.Get(url.Remove(url.LastIndexOf("/", StringComparison.Ordinal) + 1));
foreach (var calendarresource in collection.CalendarResources)
{
if (uid == calendarresource.Uid)
{
response.StatusCode = (int)HttpStatusCode.Conflict;
response.Body.Write(
$@"<?xml version='1.0' encoding='UTF-8'?>
<error xmlns='DAV:'>
<no-uid-conflict xmlns='urn:ietf:params:xml:ns:caldav'>
<href xmlns='DAV:'>{
SystemProperties._baseUrl + calendarresource
.Href}</href>
</no-uid-conflict>
</error>");
return(false);
}
}
}
else
{
//If the resource exist the procedure is update and for that the uid has to be the same.
var components = iCalendar.CalendarComponents.FirstOrDefault(comp => comp.Key != "VTIMEZONE").Value;
var calendarComponent = components.FirstOrDefault();
if (calendarComponent != null)
{
var uid = calendarComponent.Properties["UID"].StringValue;
var resource = _resourceRespository.Get(url);
if (resource.Uid != null && resource.Uid != uid)
{
response.StatusCode = (int)HttpStatusCode.Conflict;
response.Body.Write(
$@"<?xml version='1.0' encoding='UTF-8'?>
<error xmlns='DAV:'>
<no-uid-conflict xmlns='urn:ietf:params:xml:ns:caldav'>
<href xmlns='DAV:'>{
SystemProperties._baseUrl + resource
.Href}</href>
</no-uid-conflict>
</error>");
return(false);
}
}
}
if (propertiesAndHeaders.ContainsKey("If-Match"))
{
//check that the value do exist
if (!StorageManagement.ExistCalendarObjectResource(url))
{
response.StatusCode = (int)HttpStatusCode.PreconditionFailed;
return(false);
}
}
if (propertiesAndHeaders.ContainsKey("If-None-Match"))
{
//check that the value do not exist
if (StorageManagement.ExistCalendarObjectResource(url))
{
response.StatusCode = (int)HttpStatusCode.PreconditionFailed;
return(false);
}
}
//it does not contain more than two calendar components
//and if it has 2, one must be VTIMEZONE
if (iCalendar.CalendarComponents.Count > 2)
{
if (!iCalendar.CalendarComponents.ContainsKey("VTIMEZONE"))
{
response.StatusCode = (int)HttpStatusCode.Conflict;
response.Body.Write(@"<?xml version='1.0' encoding='UTF-8'?>
<error xmlns='DAV:'>
<valid-calendar-object-resource xmlns='urn:ietf:params:xml:ns:caldav'></valid-calendar-object-resource>
<error-description xmlns='http://twistedmatrix.com/xml_namespace/dav/'>
VTimezone Calendar Component Must be present.
</error-description>
</error>");
return(false);
}
var calendarComponents =
iCalendar.CalendarComponents.FirstOrDefault(comp => comp.Key != "VTIMEZONE").Value;
//A Calendar Component can be separated in multiples calendar components but all MUST
//have the same UID.
var calendarComponent = calendarComponents.FirstOrDefault();
if (calendarComponent != null)
{
var uid = calendarComponent.Properties["UID"].StringValue;
foreach (var component in calendarComponents)
{
var uidComp = component.Properties["UID"].StringValue;
if (uid != uidComp)
{
response.StatusCode = (int)HttpStatusCode.Conflict;
response.Body.Write(@"<?xml version='1.0' encoding='UTF-8'?>
<error xmlns='DAV:'>
<valid-calendar-object-resource xmlns='urn:ietf:params:xml:ns:caldav'></valid-calendar-object-resource>
<error-description xmlns='http://twistedmatrix.com/xml_namespace/dav/'>
If the count of calendar components execeds 2 including VTimezone the rest must have the same Uid and the same type.
</error-description>
</error>");
return(false);
}
}
}
// response.StatusCode = (int)HttpStatusCode.Conflict;
// response.Body.Write(@"<?xml version='1.0' encoding='UTF-8'?>
//<error xmlns='DAV:'>
//<valid-calendar-object-resource xmlns='urn:ietf:params:xml:ns:caldav'></valid-calendar-object-resource>
//<error-description xmlns='http://twistedmatrix.com/xml_namespace/dav/'>
//Wrong amount of calendar components
//</error-description>
//</error>");
// return false;
}
//precondition responsible of check that an VTIMEZONE is obligatory
if (iCalendar.CalendarComponents.Count == 2)
{
if (!iCalendar.CalendarComponents.ContainsKey("VTIMEZONE"))
{
response.StatusCode = (int)HttpStatusCode.Conflict;
response.Body.Write(@"<?xml version='1.0' encoding='UTF-8'?>
<error xmlns='DAV:'>
<valid-calendar-object-resource xmlns='urn:ietf:params:xml:ns:caldav'></valid-calendar-object-resource>
<error-description xmlns='http://twistedmatrix.com/xml_namespace/dav/'>
VTimezone Calendar Component Must be present.
</error-description>
</error>");
return(false);
}
}
//var uidCalendar = ((ComponentProperty<string>)iCalendar.Properties["UID"]).Value;
////Check that if the operation is create there is not another element in the collection with the same UID
//if (!StorageManagement.ExistCalendarObjectResource(calendarResourceId))
//{
// using (db)
// {
// if ((from calendarResource in db.CalendarResources
// where calendarResource.Uid == uidCalendar
// select calendarResource).Count() > 0)
// return false;
// }
//}
////Check if the operation is update the element to be updated must have the same UID.
//else
//{
// using (db)
// {
// if ((from calendarResource in db.CalendarResources
// where calendarResource.Uid == uidCalendar
// select calendarResource).Count() == 0)
// return false;
// }
//}
var methodProp = iCalendar.GetComponentProperties("METHOD");
//iCalendar object MUST NOT implement METHOD property
if (!string.IsNullOrEmpty(methodProp?.StringValue))
{
response.StatusCode = (int)HttpStatusCode.Conflict;
response.Body.Write(@"<?xml version='1.0' encoding='UTF-8'?>
<error xmlns='DAV:'>
<valid-calendar-object-resource xmlns='urn:ietf:params:xml:ns:caldav'></valid-calendar-object-resource>
<error-description xmlns='http://twistedmatrix.com/xml_namespace/dav/'>
Method prop must not be present
</error-description>
</error>");
return(false);
}
//This precondition is the one in charge of check that the size of the body of the resource
//included in the request dont exceeds the max-resource-size property of the colletion.
int contentSizeInt;
//for that i need that the controller has as request header content-size available
if (!string.IsNullOrEmpty(contentSize) && int.TryParse(contentSize, out contentSizeInt))
{
var collection =
_collectionRepository.Get(url.Remove(url.LastIndexOf("/", StringComparison.Ordinal) + 1));
//here the max-resource-property of the collection is called.
var maxSize =
collection.Properties.FirstOrDefault(
p => p.Name == "max-resource-size" && p.Namespace == "urn:ietf:params:xml:ns:caldav");
int maxSizeInt;
if (int.TryParse(XmlTreeStructure.Parse(maxSize?.Value).Value, out maxSizeInt) &&
contentSizeInt > maxSizeInt)
{
response.StatusCode = (int)HttpStatusCode.Conflict;
response.Body.Write(@"<?xml version='1.0' encoding='UTF-8'?>
<error xmlns='DAV:'>
<max-resource-size xmlns='urn:ietf:params:xml:ns:caldav'></max-resource-size>
<error-description xmlns='http://twistedmatrix.com/xml_namespace/dav/'>
Content size exceeds max size allowed.
</error-description>
</error>");
return(false);
}
}
//TODO: Checking that all DateTime values are less-equal than
//the max-date-time
//TODO: Checking that all DateTime values are grater-equal than
//the min-date-time
//TODO: Checking that the number of recurring instances is less-equal
//than the max-instances property value.
return(await Task.FromResult(true));
}
