Presidio Sample working as expected

Author: rogerbarreto

Applying-Responsible-Secure-AI/Samples/PromptFilteringPresidio/Core/Models/AnalyzerEntityType.cs

@@ -0,0 +1,6 @@
+namespace Sample;
+
+internal class PresidioAnalyzerConfig
+{
+    public double? ScoreThreshold { get; set; }
+}

Applying-Responsible-Secure-AI/Samples/PromptFilteringPresidio/Core/Models/AnonymizerType.cs

@@ -0,0 +1,17 @@
+namespace Sample;
+
+/// <summary>
+/// PII entities Presidio Text Analyzer is capable of detecting. Only some of them are defined here for demonstration purposes.
+/// Full list can be found here: https://microsoft.github.io/presidio/api-docs/api-docs.html#tag/Analyzer/paths/~1supportedentities/get.
+/// </summary>
+internal readonly struct PresidioAnalyzerEntityType(string name)
+    {
+        public string Name { get; } = name;
+
+        public static PresidioAnalyzerEntityType Person = new("PERSON");
+        public static PresidioAnalyzerEntityType PhoneNumber = new("PHONE_NUMBER");
+        public static PresidioAnalyzerEntityType EmailAddress = new("EMAIL_ADDRESS");
+        public static PresidioAnalyzerEntityType CreditCard = new("CREDIT_CARD");
+
+        public static implicit operator string(PresidioAnalyzerEntityType type) => type.Name;
+    }

Applying-Responsible-Secure-AI/Samples/PromptFilteringPresidio/Core/Models/PresidioAnalyzerConfig.cs

@@ -0,0 +1,18 @@
+namespace Sample;
+
+/// <summary>
+/// Anonymizer action type that can be performed to update the prompt.
+/// More information here: https://microsoft.github.io/presidio/api-docs/api-docs.html#tag/Anonymizer/paths/~1anonymizers/get
+/// </summary>
+internal readonly struct PresidioAnonymizerType(string name)
+{
+    public string Name { get; } = name;
+
+    public static PresidioAnonymizerType Hash = new("hash");
+    public static PresidioAnonymizerType Mask = new("mask");
+    public static PresidioAnonymizerType Redact = new("redact");
+    public static PresidioAnonymizerType Replace = new("replace");
+    public static PresidioAnonymizerType Encrypt = new("encrypt");
+
+    public static implicit operator string(PresidioAnonymizerType type) => type.Name;
+}

Applying-Responsible-Secure-AI/Samples/PromptFilteringPresidio/Core/Models/PresidioAnalyzerEntityType.cs

@@ -1,15 +1,13 @@
-using Microsoft.Extensions.Logging;
-using Microsoft.SemanticKernel;
+using Microsoft.SemanticKernel;
 
 namespace Sample;
 
 /// <summary>
     /// Filter which use Text Analyzer to detect PII in prompt and prevent sending it to LLM.
     /// </summary>
     internal sealed class PromptAnalyzerFilter(
-        ILogger logger,
         PresidioTextAnalyzerService analyzerService,
-        double scoreThreshold) : IPromptRenderFilter
+        PresidioAnalyzerConfig config) : IPromptRenderFilter
     {
         public async Task OnPromptRenderAsync(PromptRenderContext context, Func<PromptRenderContext, Task> next)
         {
@@ -18,7 +16,8 @@ public async Task OnPromptRenderAsync(PromptRenderContext context, Func<PromptRe
             // Get rendered prompt
             var prompt = context.RenderedPrompt!;
 
-            logger.LogTrace("Prompt: {Prompt}", prompt);
+            Console.ForegroundColor = ConsoleColor.Cyan;
+            Console.WriteLine($"Prompt: {prompt}");
 
             // Call analyzer to detect PII
             var analyzerResults = await analyzerService.AnalyzeAsync(new PresidioTextAnalyzerRequest { Text = prompt });
@@ -28,19 +27,21 @@ public async Task OnPromptRenderAsync(PromptRenderContext context, Func<PromptRe
             // Check analyzer results
             foreach (var result in analyzerResults)
             {
-                logger.LogInformation("Entity type: {EntityType}. Score: {Score}", result.EntityType, result.Score);
+                Console.WriteLine($"Entity type: {result.EntityType}. Score: {result.Score}");
 
-                if (result.Score > scoreThreshold)
+                if (result.Score > config.ScoreThreshold!)
                 {
                     piiDetected = true;
                 }
             }
 
+            Console.ResetColor();
+
             // If PII detected, throw an exception to prevent this prompt from being sent to LLM.
             // It's also possible to override 'context.Result' to return some default function result instead.
             if (piiDetected)
             {
-                throw new KernelException("Prompt contains PII information. Operation is canceled.");
+                throw new InvalidOperationException("Prompt contains PII information. Operation is canceled.");
             }
         }
     }

Applying-Responsible-Secure-AI/Samples/PromptFilteringPresidio/Core/Models/PresidioAnonymizerType.cs

@@ -6,11 +6,13 @@
 /// Filter which use Text Anonymizer to detect PII in prompt and update the prompt by following specified rules before sending it to LLM.
 /// </summary>
 internal sealed class PromptAnonymizerFilter(
-        ILogger logger,
+        ILoggerFactory loggerFactory,
         PresidioTextAnalyzerService analyzerService,
         PresidioTextAnonymizerService anonymizerService,
         Dictionary<string, PresidioTextAnonymizer> anonymizers) : IPromptRenderFilter
     {
+        private readonly ILogger<PromptAnonymizerFilter> logger = loggerFactory.CreateLogger<PromptAnonymizerFilter>();
+
         public async Task OnPromptRenderAsync(PromptRenderContext context, Func<PromptRenderContext, Task> next)
         {
             await next(context);

Applying-Responsible-Secure-AI/Samples/PromptFilteringPresidio/Filters/PresidioPromptAnalyzerFilter.cs

@@ -0,0 +1,8 @@
+POST http://localhost:5002/analyze HTTP/1.1
+content-type: application/json
+
+{
+    "text": "My name is Bob, I live in New York and my phone number is 212-555-5555",
+    "language": "en"
+}
+

Applying-Responsible-Secure-AI/Samples/PromptFilteringPresidio/Filters/PresidioPromptAnonymizerFilter.cs

@@ -0,0 +1 @@
+GET http://localhost:5002/recognizers?language=en HTTP/1.1

Applying-Responsible-Secure-AI/Samples/PromptFilteringPresidio/Http/analyzer-analyze.http

@@ -0,0 +1 @@
+GET http://localhost:5002/supportedentities?language=en HTTP/1.1