public string GetPasswordValue(PasswordBlueprint blueprint)
{
var path = GetPath(blueprint).ToList();
if (path.Any(z => Math.Min(z.X, z.Y) < 0 || Width <= z.X || Height <= z.Y))
{
return(null);
}
return(new string(path.Select(z => _matrix[z.Y * Width + z.X]).ToArray()));
}
public MatrixPassword CreateRandomMatrixPassword(int length)
{
var blueprint = new PasswordBlueprint
{
Length = Env.Config.MatrixPasswordLength
};
(var shape, var direction) = GetRandomShapeDirection();
blueprint.Shape = shape;
blueprint.Direction = direction;
SetRandomLocation(blueprint);
return(new MatrixPassword(GetPasswordValue(blueprint), blueprint));
}
private void SetRandomLocation(PasswordBlueprint blueprint)
{
for (int i = 0; i < 9999; i++)
{
blueprint.X = Helper.GetRandomInt(Width);
blueprint.Y = Helper.GetRandomInt(Height);
if (GetPasswordValue(blueprint) == null)
{
continue;
}
return;
}
throw new ArgumentException("Possible infinite loop detected.");
}
public IEnumerable <PasswordBlueprint> GetAllBlueprints(int length)
{
var blueprint = new PasswordBlueprint
{
Length = length
};
for (int x = 0; x < Width; x++)
{
blueprint.X = x;
for (int y = 0; y < Height; y++)
{
blueprint.Y = y;
foreach ((var shape, var direction) in ListAllShapeDirections())
{
blueprint.Shape = shape;
blueprint.Direction = direction;
yield return(blueprint);
}
}
}
}
private static IEnumerable <Vec> GetEndlessPath(PasswordBlueprint blueprint)
{
var v = new Vec(blueprint.X, blueprint.Y);
yield return(v);
var d1 = new Vec(blueprint.Direction[0]);
var d2 = 1 < blueprint.Direction.Length ? new Vec(blueprint.Direction[1]) : (Vec?)null;
if (blueprint.Shape == BlueprintShape.Straight)
{
while (true)
{
v = v.Add(d1);
if (d2.HasValue)
{
v = v.Add(d2.Value);
}
yield return(v);
}
}
if (!d2.HasValue)
{
throw new ArgumentException($"Expecting two direction for shape '{blueprint.Shape}'.");
}
var a = d1;
var b = d2.Value;
if (blueprint.Shape == BlueprintShape.Stairs)
{
while (true)
{
v = v.Add(a);
(a, b) = (b, a);
yield return(v);
}
}
if (blueprint.Shape == BlueprintShape.L)
{
v = v.Add(a);
yield return(v);
while (true)
{
v = v.Add(b);
yield return(v);
}
}
var steps = 1;
while (true)
{
for (int i = 0; i < steps; i++)
{
v = v.Add(a);
yield return(v);
}
for (int i = 0; i < steps; i++)
{
v = v.Add(b);
yield return(v);
}
(a, b) = (a.Multiply(-1), b.Multiply(-1));
steps++;
}
}
private static IEnumerable <Vec> GetPath(PasswordBlueprint blueprint)
{
return(GetEndlessPath(blueprint).Take(blueprint.Length));
}
