[jira] [Created] (JAMES-4153) DKIMSign: signature template: allow for interpolating the domain

Benoit Tellier created JAMES-4153:
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             Summary: DKIMSign: signature template: allow for interpolating the domain
                 Key: JAMES-4153
                 URL: https://issues.apache.org/jira/browse/JAMES-4153
             Project: James Server
          Issue Type: Improvement
          Components: Mailet Contributions
            Reporter: Benoit Tellier


h2. Why?

I want to host several doains on a single Jmes instance. 
I want to be able tohost multiple domain in a dynamic way so I cannot have static confi for DKIM
I am OK with a single DKIM private key for the entire platform

Today DKIMSign do require a static domain for `d` token preventing me to reach DMARC allgnement

h2. Proposed solution

Allow interpolate the MAIL FROM domain, with fallback to a default domain if MAIL FROM: <>

{code:java}
            <mailet match="All" class="org.apache.james.jdkim.mailets.DKIMSign">
                <signatureTemplate>v=1; s=s1; d=%MAIL_FROM; h=from:subject:date:to:cc; a=rsa-sha256; bh=; b=;</signatureTemplate>
                <defaultDomain>linagora.com</defaultDomain>
                <privateKeyFilepath>file://secrets/dkim/dkim.key</privateKeyFilepath>
                <onMailetException>ignore</onMailetException>
            </mailet>
{code}

The default domain is optional, required when using %MAIL_FROM.

%MAIL_FROM is to be replaced with the mail from domin, or the default domain if none.




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