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fix: NullReferenceException in ParameterCompatibleFilter.ParseResource (Fixes #5114) #5630

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fix: NullReferenceException in ParameterCompatibleFilter.ParseResource (Fixes #5114) #5630

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10 changes: 8 additions & 2 deletions src/Microsoft.Health.Fhir.Shared.Api/Features/Filters/ParameterCompatibleFilter.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -21,9 +21,15 @@ protected ParameterCompatibleFilter(bool allowParametersResource)

protected Resource ParseResource(Resource resource)
{
if (_allowParametersResource && resource.TypeName == KnownResourceTypes.Parameters)
if (_allowParametersResource && resource?.TypeName == KnownResourceTypes.Parameters)
{
resource = ((Parameters)resource).Parameter.Find(param => param.Name.Equals("resource", StringComparison.OrdinalIgnoreCase)).Resource;
var parameters = (Parameters)resource;
var resourceParam = parameters.Parameter?.Find(param => param.Name.Equals("resource", StringComparison.OrdinalIgnoreCase));

if (resourceParam?.Resource != null)
{
resource = resourceParam.Resource;
}
}

return resource;
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