SixLaborsCaptcha.Core 0.1.4

SixLaborsCaptcha

SixLaborsCaptcha is a simple cross-platform NuGet package for generating image captcha.

Features

• Simple & Cross-Platform
• Compatible with Linux and Windows
• Compatible with Docker images based on Linux 😃

What's New

Version 0.1.3 - Oct 8, 2021

Fix

• Use DrawLinesColor instead of TextColor in creating random lines (#2 by @NK201)

Version 0.1.3 - Oct 8, 2021

Add

• Add NoiseRateColor/NoiseRate options
• Add MinLineThickness/MaxLineThickness options

Change

• Improve the rendering speed
• Improve the captcha image security

Packages

SixLaborsCaptchaOptions

Install via CLI

To install SixLaborsCaptcha.Core, run the following command in the terminal:

> dotnet add package SixLaborsCaptcha.Core --version 0.1.3

Usage:

using SixLaborsCaptcha.Core;
using SixLabors.ImageSharp;
using System.IO;

namespace ConsoleAppSample
{
	class Program
	{
		static void Main(string[] args)
		{
			var slc = new SixLaborsCaptchaModule(new SixLaborsCaptchaOptions
			{
				DrawLines = 7,
				TextColor = new Color[] { Color.Blue, Color.Black },
			});

			var key = Extentions.GetUniqueKey(6);
			var result = slc.Generate(key);
			File.WriteAllBytes($"six-labors-captcha.png", result);
		}
	}
}

To install SixLaborsCaptcha.Mvc.Core for ASP.NET Core MVC, run the following command in the Terminal:

> dotnet add package SixLaborsCaptcha.Mvc.Core --version 0.1.3

Usage:

1. In the ConfigureServices method of Startup.cs, register the AddSixLabCaptcha generator

using SixLaborsCaptcha.Mvc.Core;
...
		public void ConfigureServices(IServiceCollection services)
		{
			services.AddSixLabCaptcha(x =>
			{
				x.DrawLines = 4;
			});
		}
...

2. Create an action to generate image

using SixLaborsCaptcha.Core;
...

[HttpGet]
[Route("[action]")]
public FileResult GetCaptchaImage([FromServices] ISixLaborsCaptchaModule sixLaborsCaptcha)
{
	string key = Extentions.GetUniqueKey(6);
	var imgText = sixLaborsCaptcha.Generate(key);
	return File(imgText, "Image/Png");
}

...

3. Get the image from action

<div class="text-center">
	<h1 class="display-4">Welcome to SixLaborsCaptcha</h1>
	<img src='@Url.Action("GetCaptchaImage","Home")?v1' />
	<br />
	<img src='@Url.Action("GetCaptchaImage","Home")?v2' />
	<br />
	<img src='@Url.Action("GetCaptchaImage","Home")?v3' />
	<br />
	<img src='@Url.Action("GetCaptchaImage","Home")?v4' />
</div>

Run asp.net core mvc app on Linux os:

1. Download a font (also, you can use the system fonts and don't needs to do this step)

wget -O ~/Downloads/marlboro.zip https://www.1001freefonts.com/d/3761/marlboro.zip
unzip -p ~/Downloads/marlboro.zip Marlboro.ttf > ~/Downloads/Marlboro.ttf
rm ~/Downloads/marlboro.zip
cp ~/Downloads/Marlboro.ttf ~/.fonts/
# other paths
# ~/.fonts/ - for your own fonts.
# /usr/local/share/fonts/ - system-wide, user installed fonts.
# /usr/share/fonts/ - system's font location.

2. Config the serivce

services.AddSixLabCaptcha(x => {
			   x.FontFamilies = new string[] { "Marlboro" };
		         });