Implementierung von JWTService und IJWTService für JWT-Operationen

Hinzugefügt wurden die JWTService-Klasse und das IJWTService-Interface zur Unterstützung der Generierung und Validierung von JWTs basierend auf Anspruchstypen. Enthält Methoden zum Erstellen von Sicherheitsschlüsseln, Generieren von Tokens und Lesen von Tokens mit ausführlicher Dokumentation.

DigitalData.Core.Contracts/Application/IJWTService.cs

@@ -0,0 +1,41 @@
+using Microsoft.IdentityModel.Tokens;
+using System.IdentityModel.Tokens.Jwt;
+using System.Security.Cryptography;
+
+namespace DigitalData.Core.Application
+{
+    /// <summary>
+    /// Defines the operations for JWT service handling claims of type <typeparamref name="TClaimValue"/>.
+    /// </summary>
+    public interface IJWTService<TClaimValue>
+    {
+        /// <summary>
+        /// Generates a symmetric security key with the specified byte size.
+        /// </summary>
+        /// <param name="byteSize">The size of the security key in bytes. Default is 32 bytes.</param>
+        /// <returns>A new instance of <see cref="SymmetricSecurityKey"/>.</returns>
+        public static SymmetricSecurityKey GenerateSecurityKey(int byteSize = 32)
+        {
+            using var rng = RandomNumberGenerator.Create();
+            var randomBytes = new byte[byteSize];
+            rng.GetBytes(randomBytes);
+            var securityKey = new SymmetricSecurityKey(randomBytes);
+
+            return securityKey;
+        }
+
+        /// <summary>
+        /// Generates a token based on the specified claim value.
+        /// </summary>
+        /// <param name="claimValue">The claim value to encode in the token.</param>
+        /// <returns>A JWT as a string.</returns>
+        string GenerateToken(TClaimValue claimValue);
+
+        /// <summary>
+        /// Reads and validates a security token from a string representation.
+        /// </summary>
+        /// <param name="token">The JWT to read.</param>
+        /// <returns>A <see cref="JwtSecurityToken"/> if the token is valid; otherwise, null.</returns>
+        JwtSecurityToken? ReadSecurityToken(string token);
+    }
+}