function
randomStringWithLength( length ) {
// random % characters.length produces too many characters at beginning of character range, because
// beginning characters appear more times in random % characters.length than do characters at the end of the characters range.
var endByteWithEqualProbability = 256 - (256 % characters.length);
var numBytes = length * 2;
var randomBytes = secureRandom.randomArray( numBytes );
// until we have a long enough result string...
var s = '';
var byteIndex = -1;
while ( s.length < length ) {
++ byteIndex;
// ensure random byte is available
if ( byteIndex >= randomBytes.length ) {
randomBytes = secureRandom.randomArray( numBytes );
byteIndex = 0;
}
// select a random byte with flat probability distribution
// (skip byte values that cause some characters to appear more than others)
var randomByte = randomBytes[ byteIndex ];
if ( randomByte < endByteWithEqualProbability ) {
var c = characters[ randomByte % characters.length ];
s += c;
}
}
return s;
}
function createTokenForSession() {
return secureRandom.randomArray(100).map(code => code.toString(36)).join('');
}
function createSessionToken() {
return secureRandom.randomArray(40).map(code => code.toString(16)).join('');
}
createSessionToken: function(userId, callback) {
// new function declaration
return secureRandom.randomArray(100).map(code => code.toString(36)).join('')
// return secureRandom.randomArray(100).map(function(code) {return code.toString(36)}).join('');
},