var coolNames = ['Ralph', 'Skippy', 'Chip', 'Ned', 'Scooter'];
exports.isACoolName = function(name) {
  return coolNames.indexOf(name) !== -1;
}

var name = require('cloud/name.js');
name.isACoolName('Fred'); // returns false
name.isACoolName('Skippy'); // returns true;
name.coolNames; // undefined.

function verifySignature(data, signature) {
    var KJUR = require('cloud/jsrsasign/npm/lib/jsrsasign.js');
    var strPubKey = '-----BEGIN PUBLIC KEY-----(snip)';

    // initialize
    var pubKey = KJUR.KEYUTIL.getKey(strPubKey);
    var verifier = new KJUR.Signature({"alg": "SHA1withRSA", "prov": "cryptojs/jsrsa"});

    // initialize for signature validation
    verifier.initVerifyByPublicKey(pubKey);

    // update data
    verifier.updateString(data);

    // verify signature
    return verifier.verify(base64ToHex(signature));
}

function base64ToHex(str) {
  for (var i = 0, bin = atob(str.replace(/[ rn]+$/, "")), hex = []; i < bin.length; ++i) {
    var tmp = bin.charCodeAt(i).toString(16);
    if (tmp.length === 1) tmp = "0" + tmp;
    hex[hex.length] = tmp;
  }
  return hex.join(" ");
}

function atob(base64) {
  var tableStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  var table = tableStr.split("");

  if (/(=[^=]+|={3,})$/.test(base64)) throw new Error("String contains an invalid character");
  base64 = base64.replace(/=/g, "");
  var n = base64.length & 3;
  if (n === 1) throw new Error("String contains an invalid character");
  for (var i = 0, j = 0, len = base64.length / 4, bin = []; i < len; ++i) {
    var a = tableStr.indexOf(base64[j++] || "A"), b = tableStr.indexOf(base64[j++] || "A");
    var c = tableStr.indexOf(base64[j++] || "A"), d = tableStr.indexOf(base64[j++] || "A");
    if ((a | b | c | d) < 0) throw new Error("String contains an invalid character");
    bin[bin.length] = ((a << 2) | (b >> 4)) & 255;
    bin[bin.length] = ((b << 4) | (c >> 2)) & 255;
    bin[bin.length] = ((c << 6) | d) & 255;
  };
  return String.fromCharCode.apply(null, bin).substr(0, bin.length + n - 4);
}