feat(RSAExtensions): Methoden zum Speichern von IRSACryptographer.Pem erstellt.

DigitalData.Core.Security.Extensions/RSAExtensions.cs

@@ -1,4 +1,5 @@
 using DigitalData.Core.Abstractions.Security;
+using System.Collections.Concurrent;
 using System.Security.Cryptography;
 
 namespace DigitalData.Core.Security.Extensions
@@ -40,5 +41,55 @@ namespace DigitalData.Core.Security.Extensions
                 return false;
             }
         }
+
+        private static string CreatePath(string key, string? directory = null)
+        {
+            directory ??= Environment.CurrentDirectory;
+
+            if (!Directory.Exists(directory))
+            {
+                Directory.CreateDirectory(directory);
+            }
+
+            return Path.Combine(directory, $"{key}.pem");
+        }
+
+        private static readonly ConcurrentDictionary<string, SemaphoreSlim> FileLocks = new();
+
+        public static void SavePem(this IRSACryptographer decryptor, string key, string? directory = null)
+        {
+            var filePath = CreatePath(key : key, directory : directory);
+            var fileLock = FileLocks.GetOrAdd(filePath, _ => new (1, 1));
+            fileLock.Wait();
+            try
+            {
+                File.WriteAllText(filePath, decryptor.Pem);
+            }
+            finally
+            {
+                fileLock.Release();
+            }
+        }
+
+        public static async Task SavePemAsync(this IRSACryptographer decryptor, string key, string? directory = null)
+        {
+            var filePath = CreatePath(key: key, directory: directory);
+            var fileLock = FileLocks.GetOrAdd(filePath, _ => new (1, 1));
+            await fileLock.WaitAsync();
+            try
+            {
+                await File.WriteAllTextAsync(filePath, decryptor.Pem);
+            }
+            finally
+            {
+                fileLock.Release();
+            }
+        }
+
+        public static void SavePem(this IRSACryptographer decryptor, string issuer, string audience, string? directory = null)
+            => decryptor.SavePem($"{issuer}:{audience}", directory);
+
+        public static async Task SavePemAsync(this IRSACryptographer decryptor, string issuer, string audience, string? directory = null)
+            => await decryptor.SavePemAsync($"{issuer}:{audience}", directory);
     }
 }