Enable access for Qute Template Instance within a Mail Template Instance

[ahofmeister]

Description

We are sending emails based on a Qute Template.

In order to see the actual template filled with data, it would be nice to provided an REST endpoint like GET /templates/user-registration?userId=2711. Maybe for other team members (or PO/PM), that are not familiar with the Quarkus World (or even Java) but want to give feedback or see the template filled with data.

I know this is working for plain Qute Template Instances. See following example:

@CheckedTemplate
  static class Templates {
    public static native TemplateInstance hello();
  }


  @GET
  @Consumes(MediaType.TEXT_HTML)
  public TemplateInstance testMail() {
    return Templates.hello();
  }
  

It's not the same as for Mail Template Instances, because the underlying TemplateInstance is private and not exposed via any method.

See also following discussion:
https://quarkusio.zulipchat.com/#narrow/stream/187030-users/topic/Convert.20.20MailTemplateInstance.20to.20TemplateInstance

Implementation ideas

See: https://github.com/quarkusio/quarkus/blob/main/extensions/mailer/runtime/src/main/java/io/quarkus/mailer/runtime/MailTemplateInstanceImpl.java#L23

Maybe just add a getter for the underlying template instance.

[quarkus-bot]

/cc @cescoffier, @mkouba

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[ahofmeister]

@mkouba Thanks. The use case popped up again and it's working. :)