.NET: Update AIContextProviders to use Microsoft.Extensions.Compliance.Redaction (#4854)

* Update providers to use Microsoft.Extensions.Compliance.Redaction

* Fix formatting.

* Fix readme

dotnet/src/Microsoft.Agents.AI/Memory/ChatHistoryMemoryProvider.cs

@@ -7,6 +7,7 @@ using System.Linq.Expressions;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.Extensions.AI;
+using Microsoft.Extensions.Compliance.Redaction;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.VectorData;
 using Microsoft.Shared.Diagnostics;
@@ -80,7 +81,7 @@ public sealed class ChatHistoryMemoryProvider : MessageAIContextProvider, IDispo
     private readonly VectorStoreCollection<object, Dictionary<string, object?>> _collection;
     private readonly int _maxResults;
     private readonly string _contextPrompt;
-    private readonly bool _enableSensitiveTelemetryData;
+    private readonly Redactor _redactor;
     private readonly ChatHistoryMemoryProviderOptions.SearchBehavior _searchTime;
     private readonly string _toolName;
     private readonly string _toolDescription;
@@ -118,7 +119,7 @@ public sealed class ChatHistoryMemoryProvider : MessageAIContextProvider, IDispo
         options ??= new ChatHistoryMemoryProviderOptions();
         this._maxResults = options.MaxResults.HasValue ? Throw.IfLessThanOrEqual(options.MaxResults.Value, 0) : DefaultMaxResults;
         this._contextPrompt = options.ContextPrompt ?? DefaultContextPrompt;
-        this._enableSensitiveTelemetryData = options.EnableSensitiveTelemetryData;
+        this._redactor = options.EnableSensitiveTelemetryData ? NullRedactor.Instance : (options.Redactor ?? new ReplacingRedactor("<redacted>"));
         this._searchTime = options.SearchTime;
         this._logger = loggerFactory?.CreateLogger<ChatHistoryMemoryProvider>();
         this._toolName = options.FunctionToolName ?? DefaultFunctionToolName;
@@ -485,7 +486,7 @@ public sealed class ChatHistoryMemoryProvider : MessageAIContextProvider, IDispo
         GC.SuppressFinalize(this);
     }
 
-    private string? SanitizeLogData(string? data) => this._enableSensitiveTelemetryData ? data : "<redacted>";
+    private string SanitizeLogData(string? data) => this._redactor.Redact(data);
 
     /// <summary>
     /// Rebinds a filter expression's body to use the specified shared parameter,

dotnet/src/Microsoft.Agents.AI/Memory/ChatHistoryMemoryProviderOptions.cs

@@ -3,6 +3,7 @@
 using System;
 using System.Collections.Generic;
 using Microsoft.Extensions.AI;
+using Microsoft.Extensions.Compliance.Redaction;
 
 namespace Microsoft.Agents.AI;
 
@@ -46,8 +47,22 @@ public sealed class ChatHistoryMemoryProviderOptions
     /// Gets or sets a value indicating whether sensitive data such as user ids and user messages may appear in logs.
     /// </summary>
     /// <value>Defaults to <see langword="false"/>.</value>
+    /// <remarks>
+    /// When set to <see langword="true"/>, sensitive data is passed through to logs unchanged and any
+    /// configured <see cref="Redactor"/> is ignored. This property takes precedence over <see cref="Redactor"/>.
+    /// </remarks>
     public bool EnableSensitiveTelemetryData { get; set; }
 
+    /// <summary>
+    /// Gets or sets a custom <see cref="Redactor"/> used to redact sensitive data in log output.
+    /// </summary>
+    /// <value>
+    /// When <see langword="null"/> (the default), sensitive data is replaced with a placeholder.
+    /// When set, this redactor is used to transform sensitive values before they are logged.
+    /// Ignored when <see cref="EnableSensitiveTelemetryData"/> is <see langword="true"/>.
+    /// </value>
+    public Redactor? Redactor { get; set; }
+
     /// <summary>
     /// Gets or sets the key used to store provider state in the <see cref="AgentSession.StateBag"/>.
     /// </summary>