allowCreate attribute not set correctly

[D-32]

samlify.ServiceProvider({
	metadata: metadata,
	allowCreate: 'true',
})

If I don't set the allowCreate property the SAML request XML will have an empty attribute, which causes it to be invalid:
<samlp:NameIDPolicy Format="urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified" AllowCreate=""/>

If I set it to true (as a boolean) as specified in ServiceProviderSettings it crashes due to string.replace is not a function.
Only if I set it to the string "true" does it work. So this is my workaround, but it's of course not ideal.

Thanks for all your work on this library @tngan 🙏

[RJFelix]

I'm having the same issue in samlify 2.8.11 but did not have it in 2.8.5, if that helps narrow down the cause.

[suzmas]

This issue started for us after upgrading from 2.8.10 to 2.8.11

It was introduced here: #523 with v2.8.11

In our case, this happens when we construct a ServiceProvider with allowCreate: true, and later call serviceProvider.createLoginRequest(idp, 'redirect')

---

• serviceProvider.createLoginRequest(idp, 'redirect') eventually calls loginRequestRedirectURL function, which passes an object with various values to libsaml.replaceTagsByValue, including the value true for key AllowCreate
• replaceTagsByValue calls escapeTag with value true (because that's the value of the AllowCreate tag)
• escapeTag passes true into xmlEscape(...)
• --> and that's what finally Throws with "TypeError string.replace is not a function"