Initial commit

source/src/MyTelegram.AuthServer/Services/RsaKeyProvider.cs

@@ -0,0 +1,33 @@
+namespace MyTelegram.AuthServer.Services;
+
+public class RsaKeyProvider(IOptions<MyTelegramAuthServerOptions> options)
+    : IRsaKeyProvider,
+        ISingletonDependency
+{
+    private string? _privateKey;
+
+    public string GetRsaPrivateKey()
+    {
+        if (!string.IsNullOrEmpty(_privateKey))
+        {
+            return _privateKey;
+        }
+
+        if (!File.Exists(options.Value.PrivateKeyFilePath))
+        {
+            throw new FileNotFoundException(
+                "Private key not exists",
+                options.Value.PrivateKeyFilePath
+            );
+        }
+
+        _privateKey = File.ReadAllText(options.Value.PrivateKeyFilePath);
+
+        if (string.IsNullOrEmpty(_privateKey))
+        {
+            throw new InvalidOperationException("Private key can not be null");
+        }
+
+        return _privateKey;
+    }
+}