module util;

import std.format;
import std.json;

import slf4d;

import deimos.openssl.rsa;
import deimos.openssl.pem;

void optional(T)(ref JSONValue val, string key, ref T receiver) {
  const(JSONValue)* p = key in val;

  if (p == null)
    return;

  static if (is(JSONValue == T))
    receiver = *p;
  else
    receiver = (*p).get!T;
}

T optional(T)(ref JSONValue val, string key) {
  T t;
  optional(val, key, t);
  return t;
}

void required(T)(ref JSONValue val, string key, ref T receiver) {
  receiver = val[key].get!T;
}

void generateRSA() {
  RSA* rsa = RSA_generate_key(2048, 3, null, null);
  BIO* bio = BIO_new(BIO_s_mem());
  PEM_write_bio_RSAPrivateKey(bio, rsa, null, null, 0, null, null);

  int keyLen = BIO_pending(bio);
  char[] pemKey = new char[keyLen + 1];
  BIO_read(bio, pemKey.ptr, keyLen);

  BIO_free_all(bio);
  RSA_free(rsa);

  infoF!"private key: %s"(pemKey);
}