feat(CodeGenerator): Die Methoden GenerateTotpSecretKey, GenerateTotpQrCode und GenerateTotpQrCode wurden als Schnittstellenimplementierung hinzugefügt.

EnvelopeGenerator.Application/Configurations/CodeGeneratorConfig.cs

@@ -1,7 +0,0 @@
-namespace EnvelopeGenerator.Application.Configurations
-{
-    public class CodeGeneratorConfig
-    {
-        public string CharPool { get; init; } = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567890123456789012345678901234567890123456789";
-    }
-}

EnvelopeGenerator.Application/Configurations/CodeGeneratorParams.cs

@@ -0,0 +1,18 @@
+namespace EnvelopeGenerator.Application.Configurations
+{
+    public class CodeGeneratorParams
+    {
+        public string CharPool { get; init; } = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567890123456789012345678901234567890123456789";
+
+        public int DefaultTotpSecretKeyLength { get; init; } = 32;
+
+        public string TotpIssuer { get; init; } = "signFlow";
+
+        /// <summary>
+        /// 0 is user email, 1 is secret key and 2 is issuer.
+        /// </summary>
+        public string TotpUrlFormat { get; init; } = "otpauth://totp/{0}?secret={1}&issuer={2}";
+
+        public int TotpQRPixelsPerModule { get; init; } = 20;
+    }
+}

EnvelopeGenerator.Application/Contracts/ICodeGenerator.cs

@@ -3,5 +3,11 @@
     public interface ICodeGenerator
     {
         string GenerateCode(int length);
+
+        public string GenerateTotpSecretKey(int? length = null);
+
+        public byte[] GenerateTotpQrCode(string userEmail, string secretKey, string? issuer = null, string? totpUrlFormat = null, int? pixelsPerModule = null);
+
+        public byte[] GenerateTotpQrCode(string userEmail, int? length = null, string? issuer = null, string? totpUrlFormat = null, int? pixelsPerModule = null);
     }
 }

EnvelopeGenerator.Application/Extensions/DIExtensions.cs

@@ -10,6 +10,7 @@ using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.DependencyInjection.Extensions;
 using DigitalData.Core.Client;
 using EnvelopeGenerator.Application.Configurations.GtxMessaging;
+using QRCoder;
 
 namespace EnvelopeGenerator.Application.Extensions
 {
@@ -55,13 +56,14 @@ namespace EnvelopeGenerator.Application.Extensions
 
             services.Configure<DispatcherConfig>(dispatcherConfigSection);
             services.Configure<MailConfig>(mailConfigSection);
-            services.Configure<CodeGeneratorConfig>(codeGeneratorConfigSection);
+            services.Configure<CodeGeneratorParams>(codeGeneratorConfigSection);
             services.Configure<EnvelopeReceiverCacheParams>(envelopeReceiverCacheParamsSection);
 
             services.AddHttpClientService<SmsParams>(smsConfigSection);
             services.TryAddSingleton<IMessagingService, GtxMessagingService>();
             services.TryAddSingleton<ICodeGenerator, CodeGenerator>();
             services.TryAddSingleton<IEnvelopeReceiverCache, EnvelopeReceiverCache>();
+            services.TryAddSingleton<QRCodeGenerator>();
 
             return services;
         }
@@ -70,7 +72,7 @@ namespace EnvelopeGenerator.Application.Extensions
             dispatcherConfigSection: config.GetSection("DispatcherConfig"),
             mailConfigSection: config.GetSection("MailConfig"),
             smsConfigSection: config.GetSection("SmsConfig"),
-            codeGeneratorConfigSection: config.GetSection("CodeGeneratorConfig"),
+            codeGeneratorConfigSection: config.GetSection("CodeGeneratorParams"),
             envelopeReceiverCacheParamsSection: config.GetSection("EnvelopeReceiverCacheParams"));
     }
 }

EnvelopeGenerator.Application/Extensions/MappingExtensions.cs

@@ -7,5 +7,8 @@ namespace EnvelopeGenerator.Application.Extensions
         public static bool Ok(this GtxMessagingResponse gtxMessagingResponse)
             => gtxMessagingResponse.TryGetValue("message-status", out var status)
             && status?.ToString()?.ToLower() == "ok";
+
+        public static string ToBase64String(this byte[] bytes)
+            => Convert.ToBase64String(bytes);
     }
 }

EnvelopeGenerator.Application/Services/CodeGenerator.cs

@@ -1,21 +1,26 @@
 using EnvelopeGenerator.Application.Configurations;
 using EnvelopeGenerator.Application.Contracts;
 using Microsoft.Extensions.Options;
+using OtpNet;
+using QRCoder;
 using System.Text;
 
 namespace EnvelopeGenerator.Application.Services
 {
     public class CodeGenerator : ICodeGenerator
     {
-        public static Lazy<CodeGenerator> LazyStatic => new(() => new CodeGenerator(Options.Create<CodeGeneratorConfig>(new())));
+        public static Lazy<CodeGenerator> LazyStatic => new(() => new CodeGenerator(Options.Create<CodeGeneratorParams>(new()), new QRCodeGenerator()));
 
         public static CodeGenerator Static => LazyStatic.Value;
 
-        private readonly string _charPool;
+        private readonly CodeGeneratorParams _params;
 
-        public CodeGenerator(IOptions<CodeGeneratorConfig> options)
+        private readonly QRCodeGenerator _qrCodeGenerator;
+
+        public CodeGenerator(IOptions<CodeGeneratorParams> options, QRCodeGenerator qrCodeGenerator)
         {
-            _charPool = options.Value.CharPool;
+            _params = options.Value;
+            _qrCodeGenerator = qrCodeGenerator;
         }
 
         public string GenerateCode(int length)
@@ -29,9 +34,33 @@ namespace EnvelopeGenerator.Application.Services
             var passwordBuilder = new StringBuilder(length);
 
             for (int i = 0; i < length; i++)
-                passwordBuilder.Append(_charPool[random.Next(_charPool.Length)]);
+                passwordBuilder.Append(_params.CharPool[random.Next(_params.CharPool.Length)]);
 
             return passwordBuilder.ToString();
         }
+
+        public string GenerateTotpSecretKey(int? length = null)
+            => Base32Encoding.ToString(KeyGeneration.GenerateRandomKey(length ?? _params.DefaultTotpSecretKeyLength));
+
+        public byte[] GenerateTotpQrCode(string userEmail, string secretKey, string? issuer = null, string? totpUrlFormat = null, int? pixelsPerModule = null)
+        {
+            var url = string.Format(totpUrlFormat ?? _params.TotpUrlFormat,
+                Uri.EscapeDataString(userEmail),
+                Uri.EscapeDataString(secretKey),
+                Uri.EscapeDataString(issuer ?? _params.TotpIssuer));
+            using var qrCodeData = _qrCodeGenerator.CreateQrCode(url, QRCodeGenerator.ECCLevel.Q);
+            using var qrCode = new BitmapByteQRCode(qrCodeData);
+            return qrCode.GetGraphic(pixelsPerModule ?? _params.TotpQRPixelsPerModule);
+        }
+
+        public byte[] GenerateTotpQrCode(string userEmail, int? length = null, string? issuer = null, string? totpUrlFormat = null, int? pixelsPerModule = null)
+        {
+            return GenerateTotpQrCode(
+                userEmail: userEmail,
+                secretKey: GenerateTotpSecretKey(length: length),
+                issuer: issuer,
+                totpUrlFormat: totpUrlFormat,
+                pixelsPerModule: pixelsPerModule);
+        }
     }
 }