feat: implement delete async method on json storage provider

src/StevanFreeborn.Extensions.Configuration.Secure/Storage/JsonFileStorageProvider.cs

@@ -30,19 +30,17 @@ public sealed class JsonFileStorageProvider(JsonStorageOptions options)
 
   public async Task WriteAsync(string key, string encryptedData, CancellationToken ct = default)
   {
-    Directory.CreateDirectory(_options.DirectoryPath);
-
     var data = await LoadAsync(ct);
     data[key] = encryptedData;
+    await SaveAsync(data, ct);
+  }
 
-    using var stream = new FileStream(
-      _options.FullPath,
-      FileMode.Create,
-      FileAccess.Write,
-      FileShare.None
-    );
-
-    await JsonSerializer.SerializeAsync(stream, data, JsonOptions, ct);
+  public async Task<bool> DeleteAsync(string key, CancellationToken ct = default)
+  {
+    var data = await LoadAsync(ct);
+    var result = data.Remove(key);
+    await SaveAsync(data, ct);
+    return result;
   }
 
   private async Task<Dictionary<string, string>> LoadAsync(CancellationToken ct)
@@ -63,4 +61,18 @@ public sealed class JsonFileStorageProvider(JsonStorageOptions options)
 
     return data ?? [];
   }
+
+  private async Task SaveAsync(Dictionary<string, string> data, CancellationToken ct)
+  {
+    Directory.CreateDirectory(_options.DirectoryPath);
+
+    using var stream = new FileStream(
+      _options.FullPath,
+      FileMode.Create,
+      FileAccess.Write,
+      FileShare.None
+    );
+
+    await JsonSerializer.SerializeAsync(stream, data, JsonOptions, ct);
+  }
 }

tests/StevanFreeborn.Extensions.Configuration.Secure.Tests/Unit/Storage/JsonFileStorageProviderTests.cs

@@ -58,6 +58,18 @@ public class JsonFileStorageProviderTests : IDisposable
     });
   }
 
+  [Fact]
+  public async Task DeleteAsync_WhenCalled_ItShouldRemoveKey()
+  {
+    await _sut.WriteAsync("KeyToDelete", "SomeValue");
+
+    var deleteResult = await _sut.DeleteAsync("KeyToDelete");
+    var readResult = await _sut.ReadAsync("KeyToDelete");
+
+    deleteResult.Should().BeTrue();
+    readResult.Should().BeEmpty();
+  }
+
   public void Dispose()
   {
     if (Directory.Exists(_tmpDirectory))
@@ -67,4 +79,4 @@ public class JsonFileStorageProviderTests : IDisposable
 
     GC.SuppressFinalize(this);
   }
-}
+}