mirror of https://github.com/abpframework/abp.git
malik masis
4 years ago
8 changed files with 370 additions and 3 deletions
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using System.Runtime.Serialization; |
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using Volo.Abp; |
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namespace Volo.CmsKit.Public.Web.Security.Captcha; |
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public class CaptchaException : UserFriendlyException |
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{ |
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public CaptchaException(string message) : base(message) |
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{ |
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} |
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public CaptchaException(SerializationInfo serializationInfo, StreamingContext context) : base(serializationInfo, context) |
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{ |
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} |
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} |
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using SixLabors.Fonts; |
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using SixLabors.ImageSharp; |
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using SixLabors.ImageSharp.Formats; |
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namespace Volo.CmsKit.Public.Web.Security.Captcha; |
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public class CaptchaOptions |
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{ |
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/// <summary>
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/// Default fonts are "Arial", "Verdana", "Times New Roman" in Windows. These fonts must exist in the target OS.
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/// </summary>
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public string[] FontFamilies { get; set; } = new string[] { "Arial", "Verdana", "Times New Roman" }; |
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public Color[] TextColor { get; set; } = new Color[] |
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{ |
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Color.Blue, Color.Black, Color.Black, Color.Brown, Color.Gray, Color.Green |
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}; |
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public Color[] DrawLinesColor { get; set; } = new Color[] |
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{ |
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Color.Blue, Color.Black, Color.Black, Color.Brown, Color.Gray, Color.Green |
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}; |
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public float MinLineThickness { get; set; } = 0.7f; |
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public float MaxLineThickness { get; set; } = 2.0f; |
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public ushort Width { get; set; } = 180; |
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public ushort Height { get; set; } = 70; |
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public ushort NoiseRate { get; set; } = 500; |
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public Color[] NoiseRateColor { get; set; } = new Color[] { Color.Gray }; |
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public byte FontSize { get; set; } = 32; |
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public FontStyle FontStyle { get; set; } = FontStyle.Regular; |
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public EncoderTypes EncoderType { get; set; } = EncoderTypes.Png; |
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public IImageEncoder Encoder => RandomTextGenerator.GetEncoder(EncoderType); |
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public byte DrawLines { get; set; } = 2; |
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public byte MaxRotationDegrees { get; set; } = 4; |
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public int Number1MinValue { get; set; } = 1; |
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public int Number1MaxValue { get; set; } = 99; |
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public int Number2MinValue { get; set; } = 1; |
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public int Number2MaxValue { get; set; } = 99; |
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public CaptchaOptions() |
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{ |
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} |
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public CaptchaOptions(int number1MinValue, int number1MaxValue, int number2MinValue, int number2MaxValue) |
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{ |
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Number1MinValue = number1MinValue; |
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Number1MaxValue = number1MaxValue; |
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Number2MinValue = number2MinValue; |
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Number1MaxValue = number2MaxValue; |
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} |
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} |
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using System; |
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namespace Volo.CmsKit.Public.Web.Security.Captcha; |
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public class CaptchaOutput |
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{ |
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public Guid Id { get; set; } |
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public string Text { get; set; } |
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public byte[] ImageBytes { get; set; } |
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public int Result { get; set; } |
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} |
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public class CaptchaInput |
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{ |
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public int Number1 { get; set; } |
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public int Number2 { get; set; } |
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} |
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public class CaptchaRequest |
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{ |
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public CaptchaInput Input { get; set; } |
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public CaptchaOutput Output { get; set; } |
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public CaptchaRequest() |
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{ |
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Input = new CaptchaInput(); |
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Output = new CaptchaOutput |
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{ |
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Id = Guid.NewGuid() |
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}; |
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} |
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} |
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namespace Volo.CmsKit.Public.Web.Security.Captcha; |
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public enum EncoderTypes |
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{ |
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Jpeg, |
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Png, |
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} |
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using System; |
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using System.Security.Cryptography; |
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using System.Text; |
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using SixLabors.ImageSharp.Formats; |
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using SixLabors.ImageSharp.Formats.Jpeg; |
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using SixLabors.ImageSharp.Formats.Png; |
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namespace Volo.CmsKit.Public.Web.Security.Captcha; |
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public static class RandomTextGenerator |
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{ |
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private static readonly char[] AllowedChars = "abcdefghijkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVXYZW23456789".ToCharArray(); |
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public static IImageEncoder GetEncoder(EncoderTypes encoderType) |
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{ |
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IImageEncoder encoder = encoderType switch |
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{ |
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EncoderTypes.Png => new PngEncoder(), |
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EncoderTypes.Jpeg => new JpegEncoder(), |
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_ => throw new ArgumentException($"Encoder '{encoderType}' not found!") |
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}; |
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return encoder; |
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} |
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public static string GetRandomText(int size) |
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{ |
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var data = new byte[4 * size]; |
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using (var crypto = new RNGCryptoServiceProvider()) |
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{ |
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crypto.GetBytes(data); |
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} |
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var result = new StringBuilder(size); |
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for (var i = 0; i < size; i++) |
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{ |
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var rnd = BitConverter.ToUInt32(data, i * 4); |
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var idx = rnd % AllowedChars.Length; |
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result.Append(AllowedChars[idx]); |
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} |
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return result.ToString(); |
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} |
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public static string GetUniqueKey(int size, char[] chars) |
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{ |
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var data = new byte[4 * size]; |
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using (var crypto = new RNGCryptoServiceProvider()) |
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{ |
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crypto.GetBytes(data); |
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} |
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var result = new StringBuilder(size); |
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for (var i = 0; i < size; i++) |
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{ |
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var rnd = BitConverter.ToUInt32(data, i * 4); |
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var idx = rnd % chars.Length; |
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result.Append(chars[idx]); |
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} |
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return result.ToString(); |
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} |
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public static float GenerateNextFloat(double min = -3.40282347E+38, double max = 3.40282347E+38) |
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{ |
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var random = new Random(); |
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var range = max - min; |
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var sample = random.NextDouble(); |
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var scaled = sample * range + min; |
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var result = (float)scaled; |
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return result; |
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} |
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} |
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using System; |
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using System.Collections.Generic; |
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using System.IO; |
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using System.Numerics; |
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using System.Threading.Tasks; |
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using SixLabors.Fonts; |
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using SixLabors.ImageSharp; |
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using SixLabors.ImageSharp.Drawing.Processing; |
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using SixLabors.ImageSharp.PixelFormats; |
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using SixLabors.ImageSharp.Processing; |
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using Volo.Abp.DependencyInjection; |
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using Color = SixLabors.ImageSharp.Color; |
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using PointF = SixLabors.ImageSharp.PointF; |
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namespace Volo.CmsKit.Public.Web.Security.Captcha; |
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public class SimpleMathsCaptchaGenerator : ISingletonDependency |
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{ |
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private static Dictionary<Guid, CaptchaRequest> Session { get; set; } = new Dictionary<Guid, CaptchaRequest>(); |
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public CaptchaOutput Generate() |
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{ |
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return Generate(options: null, number1: null, number2: null); |
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} |
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public CaptchaOutput Generate(CaptchaOptions options) |
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{ |
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return Generate(options, number1: null, number2: null); |
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} |
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/// <summary>
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/// Creates a simple captcha code.
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/// </summary>
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/// <param name="options">Options for captcha generation</param>
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/// <param name="number1">First number for maths operation</param>
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/// <param name="number2">Second number for maths operation</param>
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/// <returns></returns>
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public CaptchaOutput Generate(CaptchaOptions options, int? number1, int? number2) |
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{ |
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var random = new Random(); |
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options ??= new CaptchaOptions(); |
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number1 ??= random.Next(options.Number1MinValue, options.Number1MaxValue); |
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number2 ??= random.Next(options.Number2MinValue, options.Number2MaxValue); |
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var text = number1 + "+" + number2; |
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var request = new CaptchaRequest |
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{ |
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Input = |
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{ |
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Number1 = number1.Value, |
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Number2 = number2.Value |
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}, |
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Output = |
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{ |
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Text = text, |
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Result = Calculate(number1.Value, number2.Value), |
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ImageBytes = GenerateInternal(text, options) |
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} |
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}; |
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Session[request.Output.Id] = request; |
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return request.Output; |
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} |
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private static int Calculate(int number1, int number2) |
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{ |
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return number1 + number2; |
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} |
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public void Validate(Guid requestId, int value) |
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{ |
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var request = Session[requestId]; |
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if (request.Output.Result != value) |
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{ |
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throw new CaptchaException("The captcha code doesn't match text on the picture! Please try again."); |
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} |
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} |
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public void Validate(Guid requestId, string value) |
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{ |
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if (int.TryParse(value, out var captchaInput)) |
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{ |
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Validate(requestId, captchaInput); |
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} |
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else |
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{ |
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throw new CaptchaException("The captcha code is missing!"); |
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} |
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} |
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private byte[] GenerateInternal(string stringText, CaptchaOptions options) |
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{ |
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byte[] result; |
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using (var image = new Image<Rgba32>(options.Width, options.Height)) |
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{ |
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float position = 0; |
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var random = new Random(); |
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var startWith = (byte)random.Next(5, 10); |
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image.Mutate(ctx => ctx.BackgroundColor(Color.Transparent)); |
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var fontName = options.FontFamilies[random.Next(0, options.FontFamilies.Length)]; |
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var font = SystemFonts.CreateFont(fontName, options.FontSize, options.FontStyle); |
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foreach (var character in stringText) |
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{ |
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var text = character.ToString(); |
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var color = options.TextColor[random.Next(0, options.TextColor.Length)]; |
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var location = new PointF(startWith + position, random.Next(6, 13)); |
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image.Mutate(ctx => ctx.DrawText(text, font, color, location)); |
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position += TextMeasurer.Measure(character.ToString(), new RendererOptions(font, location)).Width; |
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} |
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//add rotation
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var rotation = GetRotation(options); |
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image.Mutate(ctx => ctx.Transform(rotation)); |
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// add the dynamic image to original image
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var size = (ushort)TextMeasurer.Measure(stringText, new RendererOptions(font)).Width; |
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var img = new Image<Rgba32>(size + 15, options.Height); |
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img.Mutate(ctx => ctx.BackgroundColor(Color.White)); |
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Parallel.For(0, options.DrawLines, i => |
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{ |
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var x0 = random.Next(0, random.Next(0, 30)); |
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var y0 = random.Next(10, img.Height); |
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var x1 = random.Next(30, img.Width); |
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var y1 = random.Next(0, img.Height); |
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img.Mutate(ctx => |
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ctx.DrawLines(options.TextColor[random.Next(0, options.TextColor.Length)], |
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RandomTextGenerator.GenerateNextFloat(options.MinLineThickness, options.MaxLineThickness), |
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new PointF[] { new PointF(x0, y0), new PointF(x1, y1) }) |
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); |
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}); |
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img.Mutate(ctx => ctx.DrawImage(image, 0.80f)); |
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Parallel.For(0, options.NoiseRate, i => |
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{ |
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var x0 = random.Next(0, img.Width); |
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var y0 = random.Next(0, img.Height); |
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img.Mutate( |
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ctx => ctx |
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.DrawLines(options.NoiseRateColor[random.Next(0, options.NoiseRateColor.Length)], |
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RandomTextGenerator.GenerateNextFloat(0.5, 1.5), new PointF[] { new Vector2(x0, y0), new Vector2(x0, y0) }) |
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); |
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}); |
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img.Mutate(x => |
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{ |
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x.Resize(options.Width, options.Height); |
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}); |
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using (var ms = new MemoryStream()) |
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{ |
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img.Save(ms, options.Encoder); |
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result = ms.ToArray(); |
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} |
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} |
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return result; |
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} |
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private static AffineTransformBuilder GetRotation(CaptchaOptions options) |
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{ |
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var random = new Random(); |
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var width = random.Next(10, options.Width); |
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var height = random.Next(10, options.Height); |
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var pointF = new PointF(width, height); |
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var rotationDegrees = random.Next(0, options.MaxRotationDegrees); |
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return new AffineTransformBuilder().PrependRotationDegrees(rotationDegrees, pointF); |
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} |
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} |
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