private static string GetMessageType(HL7.Dotnetcore.Message message)
{
string messageType = string.Empty;
if (message.IsComponentized("MSH.9"))
{
messageType = message.GetValue("MSH.9.1");
}
else
{
messageType = message.GetValue("MSH.9");
}
return(messageType);
}
/// <summary>
/// Determine the configuration authorization key to use to check authorization.
/// </summary>
/// <param name="message">An HL7v2 message.</param>
/// <returns>Returns the configured authorization scopes, or empty if unknown message.</returns>
private string[] GetMessageAuthorizationScope(HL7.Dotnetcore.Message message)
{
string[] scopesNeeded = Array.Empty <string>();
string messageType = GetMessageType(message); // MSH.9
foreach (MessageConfig messageConfig in this.hl7AuthConfig.Hl7v2Authorization.MessageConfig)
{
if ((messageType == messageConfig.MessageType) && IsConfiguredMessage(messageConfig, message))
{
scopesNeeded = messageConfig.Scope.Split(" ", StringSplitOptions.RemoveEmptyEntries);
break;
}
}
return(scopesNeeded);
}
/// <summary>
/// Checks that the message passed has all the fields.
/// </summary>
/// <param name="messageConfig">The MessageConfig configuration from app settings.</param>
/// <param name="message">The HL7v2 message being matched.</param>
/// <returns>Returns true when the HL7v2 message was found in the configuration.</returns>
private static bool IsConfiguredMessage(MessageConfig messageConfig, HL7.Dotnetcore.Message message)
{
int requiredMatches = messageConfig.MessageSegments.Count;
int matches = 0;
foreach (MessageSegment ms in messageConfig.MessageSegments)
{
List <string> segmentValues = new List <string>();
foreach (HL7.Dotnetcore.Segment segment in message.Segments(ms.SegmentName))
{
bool fieldsMatch = false;
bool firstField = true;
foreach (SegmentField sf in ms.SegmentFields)
{
bool found = segment.FieldAt(sf.Index).Value.Equals(sf.Value, StringComparison.Ordinal);
if (firstField == true)
{
fieldsMatch = found;
firstField = false;
}
else
{
fieldsMatch &= found;
}
}
if (fieldsMatch == true)
{
matches++;
}
}
}
return(matches == requiredMatches);
}
/// <summary>
/// Returns the configured scopes needed for the HL7v2 message passed in.
/// </summary>
/// <param name="message">The Hl7-v2 message to be checked.</param>
/// <returns>Returns a string array of scopes needed, or empty array when the message was unknown/not supported.</returns>
public string[] ScopesNeededForMessage(HL7.Dotnetcore.Message message)
{
return(this.GetMessageAuthorizationScope(message));
}
