accessing user principal in scripted attributes

[Liam Hoekenga]

I'm trying to update our scripted attributes to IdP v3 + Nashorn.

Based on the v2 compatibility section, I expected that this might work...

    principal = requestContext.principalName;

but that returns...

net.shibboleth.idp.attribute.resolver.ad.impl.ScriptedAttributeDefinition.doAttributeDefinitionResolve(ScriptedAttributeDefinition.java:152)
Caused by: javax.script.ScriptException: TypeError: Cannot get property
"principalName" of null in <eval> at line number 11

The docs mention a number of contexts that are available as variables.  I
assumed that meant they'd be available without available without
.getSubcontext().  I've tried both resolutionContext.principal
and resolutionContext.getPrincipal(), but get errors stating that
resolutionContext is null.

What am I missing?

Liam
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