Added two document connectors to SemanticKernel.Connectors.Document: …

…`DocDocumentConnector` for ´.doc´ files and `HtmlDocumentConnector` for `.html` files.

CHANGELOG.md

@@ -30,6 +30,9 @@ Previous classification is not required if changes are simple or all belong to t
 - Added the `AtLeastOneRequiredAttribute` Data Annotation to validate that at least one of the specified properties has a value.
 - Enchanced `JsonUtils` with new methods: `FastCheckIsJson` and `IsAnAdaptiveCard`.
 - Added new `AtLeastOneRequiredSchemaFilter` to ensure OpenAPI schemas enforce that at least one of the specified properties is required, by modifying the schema to use the `anyOf` rule in Swagger documentation generation.
+- Added two new connectors to `Encamina.Enmarcha.SemanticKernel.Connectors.Document`:
+    - Document connector for reading `.doc` files: `DocDocumentConnector`.
+    - Document connector for reading `.html` files: `HtmlDocumentConnector`.
 
 ## [8.1.8]
 

src/Encamina.Enmarcha.SemanticKernel.Connectors.Document/Connectors/DocDocumentConnector.cs

@@ -0,0 +1,44 @@
+using System.Text;
+
+using CommunityToolkit.Diagnostics;
+
+using NPOI.HWPF;
+using NPOI.HWPF.Extractor;
+
+namespace Encamina.Enmarcha.SemanticKernel.Connectors.Document.Connectors;
+
+/// <summary>
+/// Extracts text from a document in the <c>.doc</c> format.
+/// </summary>
+public class DocDocumentConnector : IEnmarchaDocumentConnector
+{
+    /// <inheritdoc/>
+    public IReadOnlyList<string> CompatibleFileFormats => [".DOC"];
+
+    /// <inheritdoc/>
+    public virtual string ReadText(Stream stream)
+    {
+        Guard.IsNotNull(stream);
+
+        // Register the code pages encoding provider for the .doc files
+        Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
+
+        var document = new HWPFDocument(stream);
+
+        var extractor = new WordExtractor(document);
+
+        return extractor.Text.Trim();
+    }
+
+    /// <inheritdoc/>
+    public virtual void Initialize(Stream stream)
+    {
+        // Intentionally not implemented to comply with the Liskov Substitution Principle...
+    }
+
+    /// <inheritdoc/>
+    public virtual void AppendText(Stream stream, string text)
+    {
+        // Intentionally not implemented to comply with the Liskov Substitution Principle...
+    }
+}

src/Encamina.Enmarcha.SemanticKernel.Connectors.Document/Connectors/HtmlDocumentConnector.cs

@@ -0,0 +1,42 @@
+using CommunityToolkit.Diagnostics;
+
+using HtmlAgilityPack;
+
+namespace Encamina.Enmarcha.SemanticKernel.Connectors.Document.Connectors;
+
+/// <summary>
+/// Extracts text from a document in the <c>.html</c> format.
+/// </summary>
+public class HtmlDocumentConnector : IEnmarchaDocumentConnector
+{
+    /// <inheritdoc/>
+    public IReadOnlyList<string> CompatibleFileFormats => [".HTML"];
+
+    /// <inheritdoc/>
+    public virtual string ReadText(Stream stream)
+    {
+        Guard.IsNotNull(stream);
+
+        var htmlDoc = new HtmlDocument();
+        htmlDoc.Load(stream);
+
+        var text = htmlDoc.DocumentNode.InnerText.Trim();
+
+        // Remove all html tags from the text
+        var cleanedText = HtmlEntity.DeEntitize(text);
+
+        return cleanedText;
+    }
+
+    /// <inheritdoc/>
+    public virtual void Initialize(Stream stream)
+    {
+        // Intentionally not implemented to comply with the Liskov Substitution Principle...
+    }
+
+    /// <inheritdoc/>
+    public virtual void AppendText(Stream stream, string text)
+    {
+        // Intentionally not implemented to comply with the Liskov Substitution Principle...
+    }
+}

src/Encamina.Enmarcha.SemanticKernel.Connectors.Document/Encamina.Enmarcha.SemanticKernel.Connectors.Document.csproj

@@ -20,10 +20,12 @@
 
   <ItemGroup>
     <PackageReference Include="ExcelNumberFormat" Version="1.1.0" />
+    <PackageReference Include="HtmlAgilityPack" Version="1.11.71" />
     <PackageReference Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.Options.DataAnnotations" Version="8.0.0" />
     <PackageReference Include="Microsoft.SemanticKernel.Plugins.Document" Version="1.17.2-alpha" />
     <PackageReference Include="PdfPig" Version="0.1.8" />
+    <PackageReference Include="ScratchPad.NPOI.HWPF" Version="2.5.7" />
     <PackageReference Include="SixLabors.ImageSharp" Version="3.1.5" />
     <PackageReference Include="System.Memory.Data" Version="8.0.0" />
   </ItemGroup>

src/Encamina.Enmarcha.SemanticKernel.Connectors.Document/Extensions/IServiceCollectionExtensions.cs

@@ -88,6 +88,26 @@ public static IServiceCollection AddWordDocumentConnector(this IServiceCollectio
         return services.AddSingleton<IEnmarchaDocumentConnector, WordDocumentConnector>();
     }
 
+    /// <summary>
+    /// Adds the <see cref="DocDocumentConnector"/> implementation of <see cref="IEnmarchaDocumentConnector"/> to the specified <see cref="IServiceCollection"/> as a singleton service.
+    /// </summary>
+    /// <param name="services">The <see cref="IServiceCollection"/> to add services to.</param>
+    /// <returns>The <see cref="IServiceCollection"/> so that additional calls can be chained.</returns>
+    public static IServiceCollection AddDocDocumentConnector(this IServiceCollection services)
+    {
+        return services.AddSingleton<IEnmarchaDocumentConnector, DocDocumentConnector>();
+    }
+
+    /// <summary>
+    /// Adds the <see cref="HtmlDocumentConnector"/> implementation of <see cref="IEnmarchaDocumentConnector"/> to the specified <see cref="IServiceCollection"/> as a singleton service.
+    /// </summary>
+    /// <param name="services">The <see cref="IServiceCollection"/> to add services to.</param>
+    /// <returns>The <see cref="IServiceCollection"/> so that additional calls can be chained.</returns>
+    public static IServiceCollection AddHtmlDocumentConnector(this IServiceCollection services)
+    {
+        return services.AddSingleton<IEnmarchaDocumentConnector, HtmlDocumentConnector>();
+    }
+
     /// <summary>
     /// Adds the <see cref="CleanPdfDocumentConnector"/> implementation of <see cref="IEnmarchaDocumentConnector"/> to the specified <see cref="IServiceCollection"/> as a singleton service.
     /// </summary>