From 0e0513e640bef5790631e3c043caadfa58d089e8 Mon Sep 17 00:00:00 2001
From: Developer 02 <developer02@didaloghe.onmicrosoft.com>
Date: Wed, 20 Nov 2024 10:32:25 +0100
Subject: [PATCH] feat(RSAExtensions): Methoden zum Speichern von
 IRSACryptographer.Pem erstellt.

---
 .../RSAExtensions.cs                          | 51 +++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/DigitalData.Core.Security.Extensions/RSAExtensions.cs b/DigitalData.Core.Security.Extensions/RSAExtensions.cs
index 2e70062..ccb0102 100644
--- a/DigitalData.Core.Security.Extensions/RSAExtensions.cs
+++ b/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);
     }
 }
\ No newline at end of file