Add PDF signing feature with UI and backend support

Introduced a new `PdfSigningService` for digitally signing PDFs using a PFX certificate and DevExpress's `PdfDocumentSigner`. Updated `Program.cs` to register the service and added a new configuration section `PdfSigning` in `appsettings.json` for certificate management. Added a Razor Page `TestSignature.cshtml` and its page model `TestSignature.cshtml.cs` to provide a user interface for testing PDF signing. The page includes file upload, signature validation, and result display functionality. Implemented supporting classes `PdfSigningOptions` for signature customization and `SignatureInformation` for extracting and displaying signature details, including signer name, location, and certificate validity.
2026-06-23 15:32:33 +02:00
parent de4e9421af
commit 1ed873fc84
5 changed files with 362 additions and 0 deletions
--- a/DXApp.TemplateKitProject/Pages/TestSignature.cshtml.cs
+++ b/DXApp.TemplateKitProject/Pages/TestSignature.cshtml.cs
@@ -0,0 +1,82 @@
+using DXApp.TemplateKitProject.Services;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+
+namespace DXApp.TemplateKitProject.Pages;
+
+public class TestSignatureModel(
+    PdfSigningService signingService,
+    IConfiguration configuration,
+    ILogger<TestSignatureModel> logger) : PageModel
+{
+    [BindProperty]
+    public IFormFile? PdfFile { get; set; }
+
+    public bool Success { get; private set; }
+    public string? ErrorMessage { get; private set; }
+    public string? OriginalFileName { get; private set; }
+    public long OriginalSizeKb { get; private set; }
+    public string? SignedFileName { get; private set; }
+    public long SignedSizeKb { get; private set; }
+    public string? OutputPath { get; private set; }
+    public List<SignatureInformation>? SignatureInfo { get; private set; }
+
+    public void OnGet()
+    {
+    }
+
+    public async Task<IActionResult> OnPostAsync()
+    {
+        if (PdfFile is null || PdfFile.Length == 0)
+        {
+            ModelState.AddModelError(nameof(PdfFile), "Bitte eine PDF-Datei auswählen.");
+            return Page();
+        }
+
+        if (!PdfFile.FileName.EndsWith(".pdf", StringComparison.OrdinalIgnoreCase))
+        {
+            ModelState.AddModelError(nameof(PdfFile), "Nur PDF-Dateien sind erlaubt.");
+            return Page();
+        }
+
+        try
+        {
+            OriginalFileName = PdfFile.FileName;
+
+            // PDF in Byte-Array laden
+            using var memStream = new MemoryStream();
+            await PdfFile.CopyToAsync(memStream);
+            var originalBytes = memStream.ToArray();
+            OriginalSizeKb = originalBytes.Length / 1024;
+
+            logger.LogInformation("Signiere PDF: {FileName} ({Size} KB)", OriginalFileName, OriginalSizeKb);
+
+            // PDF signieren
+            var signedBytes = await signingService.SignPdfAsync(originalBytes);
+            SignedSizeKb = signedBytes.Length / 1024;
+
+            // Speichern
+            var outputDir = configuration["PdfResults:OutputDirectory"] ?? Path.GetTempPath();
+            Directory.CreateDirectory(outputDir);
+
+            SignedFileName = Path.GetFileNameWithoutExtension(PdfFile.FileName) + "_signed.pdf";
+            OutputPath = Path.Combine(outputDir, SignedFileName);
+
+            await System.IO.File.WriteAllBytesAsync(OutputPath, signedBytes);
+
+            logger.LogInformation("Signierte PDF gespeichert: {Path}", OutputPath);
+
+            // Signatur-Informationen auslesen
+            SignatureInfo = await signingService.GetSignatureInfoAsync(signedBytes);
+
+            Success = true;
+        }
+        catch (Exception ex)
+        {
+            logger.LogError(ex, "Fehler beim Signieren der PDF: {FileName}", PdfFile.FileName);
+            ErrorMessage = ex.Message;
+        }
+
+        return Page();
+    }
+}