Truncate SMAL attribute value

[snehal.libra]

Hi,

Currently, I’m using Auth0 as an IdP for login via SAML. The client requires that the email address should be truncated to only 30 Char… is there a way to truncate email address or any function to get the substring of email.

{
“mappings”: {
“email”: “http://schemas.xmlsoap.org/ws/2005/05/identity/claims/emailaddress”,\
}
}

[Guangjie]

Hi Snehal,

Welcome to the Auth0 community,

You can create a rule to truncate the email address and assign it to a new field, e.g. called email_truncated, then map the email_truncated field to SAML claims.

Here is the detailed steps:

1. Create a new rule named truncate email address by following this document.
2. Use the following code as reference for the rule truncate email address:

function truncate_email_address(user, context, callback) {
  function truncate_email(email) {
    // implement the code of truncating email to 30 charactors
  }
  if (context.clientID === "YOUR_SAML_CLIENT_ID") {
    user.email_truncated = truncate_email(user.email);
  }
  callback(null, user, context);
}

3. Update the mappings of SAML

{
  “mappings”: {
  “email_truncated”: “http://schemas.xmlsoap.org/ws/2005/05/identity/claims/emailaddress”,
  // you can also map the original email as a reference
  “email”: “http://schemas.xmlsoap.org/ws/2005/05/identity/claims/emailaddress_untruncated”
  }
}

With the above changes, in the SAML response, you should have the truncated email in the http://schemas.xmlsoap.org/ws/2005/05/identity/claims/emailaddress attribute, and the untruncated email in the http://schemas.xmlsoap.org/ws/2005/05/identity/claims/emailaddress_untruncated attribute.