checkPassword static method
check password strong and return double value 0-1
. original source code is
here
Implementation
static double checkPassword(String password) {
// if [password] is empty return 0.0
if (password.isEmpty) {
return 0.0;
}
final double bonus;
if (RegExp(r'^[a-z]*$').hasMatch(password)) {
bonus = 1.0;
} else if (RegExp(r'^[a-z0-9]*$').hasMatch(password)) {
bonus = 1.2;
} else if (RegExp(r'^[a-zA-Z]*$').hasMatch(password)) {
bonus = 1.3;
} else if (RegExp(r'^[a-z\-_!?]*$').hasMatch(password)) {
bonus = 1.3;
} else if (RegExp(r'^[a-zA-Z0-9]*$').hasMatch(password)) {
bonus = 1.5;
} else {
bonus = 1.8;
}
// return double value [0-1]
double logistic(double x) => 1.0 / (1.0 + exp(-x));
// return double value [0-1]
double curve(double x) => logistic((x / 3.0) - 4.0);
// return double value [0-1]
return curve(password.length * bonus);
}