Extend require() to allow plaintext to variable

[Sibul2k]

Is your feature request related to a problem? Please describe.
As discussed on the mailing list between Tom and me. Topic: "Generation of correct TLSA record variables - How?"
My issue basically could be solved by an monstrocity of escaped ", " and ' combinations. It's not readable code. It would be way more easy, if the project would allow an easy option to load plaintext from files into a variable.

Describe the solution you'd like

------ ./somefile.txt ------
CNAME("foo", "foo.example.com."),

------ ./dnscontrol.js -------

[...]
var FOO = require(./somefile.txt)

D("example.com", REG_MY_PROVIDER,
   [..],
   FOO,
END);
[...]

Result:
CNAME foo.example.com was added to D()

Describe alternatives you've considered
I had to generate this:

var  EXAMPLE_MAIL_DOMAIN_TLSA = require("/opt/dnscontrol/TLSA-25-mail.example.com.json");
var  EXAMPLE_MAIL_DOMAIN_TLSA3 = TLSA("\"_" +  EXAMPLE_MAIL_DOMAIN_TLSA["port"] + "._tcp." + EXAMPLE_MAIL_DOMAIN_TLSA["domain"] + ".\"", 3, 1, 1, "\"" +  EXAMPLE_MAIL_DOMAIN_TLSA["cert_hash"] + "\"");
var  EXAMPLE_MAIL_DOMAIN_TLSA2 = TLSA("\"_" +  EXAMPLE_MAIL_DOMAIN_TLSA["port"] + "._tcp." +  EXAMPLE_MAIL_DOMAIN_TLSA["domain"] + ".\"", 2, 1, 1, "\"" +  EXAMPLE_MAIL_DOMAIN_TLSA["root_ca_hash"] + "\"");

where all the variable parts I generated with some other script had to be reconstructed from json. I could have altered the generation of the script to just the plaintext TLSA() string.

Additional context
Should be sufficient, I hope.

Just for reference: My TLSA() script to generate the variables, if someone cares to do DANE as well. Could be altered to read the certificate file instead or talk to a webserver, not mail by changing the openssl options.

-------- ./get_smtp_tls_hash.sh -----------------

#!/bin/bash

# Defaults
PORT=25
DOMAIN=""

# get CLI-Options
while getopts "d:p:" opt; do
  case $opt in
    d) DOMAIN="$OPTARG" ;;
    p) PORT="$OPTARG" ;;
    *) echo "Usage: $0 -d <domain> [-p <port>]" && exit 1 ;;
  esac
done

# Check if DOMAIN exists
if [[ -z "$DOMAIN" ]]; then
  echo "Error: Domain (-d) is required."
  exit 1
fi

# get live certificat information
CERTIFICATE=$(echo | openssl s_client -starttls smtp -connect ${DOMAIN}:${PORT} 2>/dev/null | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p')
ROOT_CA=$(echo "$CERTIFICATE" | openssl x509 -noout -issuer -next_serial)

# SHA256-Hash calculation
CERT_HASH=$(echo "$CERTIFICATE" | openssl x509 -noout -pubkey | openssl sha256 | awk '{print $2}')
ROOT_CA_HASH=$(echo "$ROOT_CA" | openssl sha256 | awk '{print $2}')

# Generate TLSA() records
#  echo "TLSA(\"_${PORT}._tcp.${DOMAIN}.\", 3, 1, 1, \"${CERT_HASH}\")" > ./TLSA-${PORT}-3-${DOMAIN}.txt
#  echo "TLSA(\"_${PORT}._tcp.${DOMAIN}.\", 2, 1, 1, \"${ROOT_CA_HASH}\")" > ./TLSA-${PORT}-2-${DOMAIN}.txt

# Generate as JSON
echo '{
  "port": "'${PORT}'",
  "domain": "'${DOMAIN}'",
  "cert_hash": "'${CERT_HASH}'",
  "root_ca_hash": "'${ROOT_CA_HASH}'"
}' > ./TLSA-${PORT}-${DOMAIN}.json

---

Thank you for considering this request.