public FilterCursor(IEnumerable <Filter> filters)
{
_filterInfo = ProcessOverrideFilters(filters);
_index = 0;
_authenticationFilters = new List <IAuthenticationFilter>();
SplitFilters(this, _filterInfo);
}
public FilterInfo(IEnumerable <Filter> filters)
{
// Determine the override scope for each filter type and cache the filters list.
OverrideFilterInfo processed = ProcessOverrideFilters(filters);
// Split the cached filters list based on filter type and override scope.
SplitFilters(processed);
}
private static OverrideFilterInfo ProcessOverrideFilters(IEnumerable<Filter> filters)
{
OverrideFilterInfo result = new OverrideFilterInfo
{
ActionOverrideScope = FilterScope.First,
AuthenticationOverrideScope = FilterScope.First,
AuthorizationOverrideScope = FilterScope.First,
ExceptionOverrideScope = FilterScope.First,
ResultOverrideScope = FilterScope.First,
Filters = new List<Filter>()
};
// Evaluate the 'filters' enumerable only once since the operation can be quite expensive.
foreach (Filter filter in filters)
{
if (filter == null)
{
continue;
}
IOverrideFilter overrideFilter = filter.Instance as IOverrideFilter;
if (overrideFilter != null)
{
if (overrideFilter.FiltersToOverride == typeof(IActionFilter)
&& filter.Scope >= result.ActionOverrideScope)
{
result.ActionOverrideScope = filter.Scope;
}
else if (overrideFilter.FiltersToOverride == typeof(IAuthenticationFilter)
&& filter.Scope >= result.AuthenticationOverrideScope)
{
result.AuthenticationOverrideScope = filter.Scope;
}
else if (overrideFilter.FiltersToOverride == typeof(IAuthorizationFilter)
&& filter.Scope >= result.AuthorizationOverrideScope)
{
result.AuthorizationOverrideScope = filter.Scope;
}
else if (overrideFilter.FiltersToOverride == typeof(IExceptionFilter)
&& filter.Scope >= result.ExceptionOverrideScope)
{
result.ExceptionOverrideScope = filter.Scope;
}
else if (overrideFilter.FiltersToOverride == typeof(IResultFilter)
&& filter.Scope >= result.ResultOverrideScope)
{
result.ResultOverrideScope = filter.Scope;
}
}
// Cache filters to avoid having to enumerate it again (expensive). Do so here to avoid an extra loop.
result.Filters.Add(filter);
}
return result;
}
private static OverrideFilterInfo ProcessOverrideFilters(IEnumerable <Filter> filters)
{
OverrideFilterInfo result = new OverrideFilterInfo
{
ActionOverrideScope = FilterScope.First,
AuthenticationOverrideScope = FilterScope.First,
AuthorizationOverrideScope = FilterScope.First,
ExceptionOverrideScope = FilterScope.First,
ResultOverrideScope = FilterScope.First,
Filters = new List <Filter>()
};
// Evaluate the 'filters' enumerable only once since the operation can be quite expensive.
foreach (Filter filter in filters)
{
if (filter == null)
{
continue;
}
IOverrideFilter overrideFilter = filter.Instance as IOverrideFilter;
if (overrideFilter != null)
{
if (overrideFilter.FiltersToOverride == typeof(IActionFilter) &&
filter.Scope >= result.ActionOverrideScope)
{
result.ActionOverrideScope = filter.Scope;
}
else if (overrideFilter.FiltersToOverride == typeof(IAuthenticationFilter) &&
filter.Scope >= result.AuthenticationOverrideScope)
{
result.AuthenticationOverrideScope = filter.Scope;
}
else if (overrideFilter.FiltersToOverride == typeof(IAuthorizationFilter) &&
filter.Scope >= result.AuthorizationOverrideScope)
{
result.AuthorizationOverrideScope = filter.Scope;
}
else if (overrideFilter.FiltersToOverride == typeof(IExceptionFilter) &&
filter.Scope >= result.ExceptionOverrideScope)
{
result.ExceptionOverrideScope = filter.Scope;
}
else if (overrideFilter.FiltersToOverride == typeof(IResultFilter) &&
filter.Scope >= result.ResultOverrideScope)
{
result.ResultOverrideScope = filter.Scope;
}
}
// Cache filters to avoid having to enumerate it again (expensive). Do so here to avoid an extra loop.
result.Filters.Add(filter);
}
return(result);
}
private static void SplitFilters(FilterCursor filterInfo, OverrideFilterInfo overrideFilterInfo)
{
foreach (var filter in overrideFilterInfo.Filters)
{
if (filter.Instance is IAuthenticationFilter authenticationFilter && filter.Scope >= overrideFilterInfo.AuthenticationOverrideScope)
{
filterInfo._authenticationFilters.Add(authenticationFilter);
}
}
}
private void SplitFilters(OverrideFilterInfo info)
{
Contract.Assert(info.Filters != null);
foreach (Filter filter in info.Filters)
{
Contract.Assert(filter != null);
IActionFilter actionFilter = filter.Instance as IActionFilter;
if (actionFilter != null && filter.Scope >= info.ActionOverrideScope)
{
_actionFilters.Add(actionFilter);
}
IAuthenticationFilter authenticationFilter =
filter.Instance as IAuthenticationFilter;
if (
authenticationFilter != null && filter.Scope >= info.AuthenticationOverrideScope
)
{
_authenticationFilters.Add(authenticationFilter);
}
IAuthorizationFilter authorizationFilter = filter.Instance as IAuthorizationFilter;
if (authorizationFilter != null && filter.Scope >= info.AuthorizationOverrideScope)
{
_authorizationFilters.Add(authorizationFilter);
}
IExceptionFilter exceptionFilter = filter.Instance as IExceptionFilter;
if (exceptionFilter != null && filter.Scope >= info.ExceptionOverrideScope)
{
_exceptionFilters.Add(exceptionFilter);
}
IResultFilter resultFilter = filter.Instance as IResultFilter;
if (resultFilter != null && filter.Scope >= info.ResultOverrideScope)
{
_resultFilters.Add(resultFilter);
}
}
}
private void SplitFilters(OverrideFilterInfo info)
{
Contract.Assert(info.Filters != null);
foreach (Filter filter in info.Filters)
{
Contract.Assert(filter != null);
IActionFilter actionFilter = filter.Instance as IActionFilter;
if (actionFilter != null && filter.Scope >= info.ActionOverrideScope)
{
_actionFilters.Add(actionFilter);
}
IAuthenticationFilter authenticationFilter = filter.Instance as IAuthenticationFilter;
if (authenticationFilter != null && filter.Scope >= info.AuthenticationOverrideScope)
{
_authenticationFilters.Add(authenticationFilter);
}
IAuthorizationFilter authorizationFilter = filter.Instance as IAuthorizationFilter;
if (authorizationFilter != null && filter.Scope >= info.AuthorizationOverrideScope)
{
_authorizationFilters.Add(authorizationFilter);
}
IExceptionFilter exceptionFilter = filter.Instance as IExceptionFilter;
if (exceptionFilter != null && filter.Scope >= info.ExceptionOverrideScope)
{
_exceptionFilters.Add(exceptionFilter);
}
IResultFilter resultFilter = filter.Instance as IResultFilter;
if (resultFilter != null && filter.Scope >= info.ResultOverrideScope)
{
_resultFilters.Add(resultFilter);
}
}
}
