@Override
            public void setToken(String name, String value) {
                super.setToken(name, secretService.canonicalize(value));
            }
Creates a new TokenFilter instance with token values set for all tokens
which are not specific to connections or connection groups. Currently,
this is only the vault-specific username token ("USERNAME"). Each token
stored within the returned TokenFilter via setToken() will be
automatically canonicalized for use within secret names.

@return
    A new TokenFilter instance with token values set for all tokens
    which are not specific to connections or connection groups.
extensions/guacamole-vault/modules/guacamole-vault-base/src/main/java/org/apache/guacamole/vault/user/VaultUserContext.java