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.
This commit is contained in:
OlgunR
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DXApp.TemplateKitProject/Pages/TestSignature.cshtml
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DXApp.TemplateKitProject/Pages/TestSignature.cshtml
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@page
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@model DXApp.TemplateKitProject.Pages.TestSignatureModel
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@{
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ViewData["Title"] = "PDF-Signatur testen";
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}
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<div class="content-block">
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<h2><i class="dx-icon-key"></i> PDF-Signatur Test</h2>
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<p class="text-muted">Einfacher Test zum Signieren einer PDF mit dem DevExpress PdfDocumentSigner.</p>
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<form method="post" enctype="multipart/form-data" class="mt-4">
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<div class="mb-3">
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<label for="pdfFile" class="form-label">PDF-Datei auswählen</label>
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<input type="file" class="form-control" id="pdfFile" name="PdfFile" accept=".pdf" required />
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<span asp-validation-for="PdfFile" class="text-danger"></span>
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</div>
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<button type="submit" class="btn btn-primary">
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<i class="dx-icon-key"></i> PDF signieren
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</button>
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</form>
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@if (Model.Success)
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{
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<div class="alert alert-success mt-4">
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<h5><i class="dx-icon-check"></i> ? PDF erfolgreich signiert!</h5>
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<p class="mb-2">
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<strong>Original:</strong> @Model.OriginalFileName (@Model.OriginalSizeKb KB)<br />
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<strong>Signiert:</strong> @Model.SignedFileName (@Model.SignedSizeKb KB)<br />
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<strong>Gespeichert:</strong> <code>@Model.OutputPath</code>
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</p>
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</div>
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@if (Model.SignatureInfo != null && Model.SignatureInfo.Count > 0)
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{
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<div class="alert alert-info mt-3">
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<h6><i class="dx-icon-info"></i> Signatur-Details:</h6>
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@foreach (var sig in Model.SignatureInfo)
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{
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<div class="mb-3 p-2 border-start border-3 border-primary">
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<strong>Signatur:</strong> @sig.FieldName<br />
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<strong>Unterzeichner:</strong> @sig.SignerName<br />
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<strong>Ort:</strong> @sig.Location<br />
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<strong>Grund:</strong> @sig.Reason<br />
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<strong>Datum:</strong> @sig.Date.ToString("dd.MM.yyyy HH:mm:ss")<br />
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<strong>Signatur gültig:</strong>
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@if (sig.IsSignatureValid)
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{
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<span class="badge bg-success">? Ja</span>
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}
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else
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{
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<span class="badge bg-danger">? Nein</span>
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}
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<br />
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<strong>Zertifikat gültig:</strong>
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@if (sig.IsCertificateValid)
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{
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<span class="badge bg-success">? Ja</span>
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}
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else
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{
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<span class="badge bg-danger">? Nein</span>
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}
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<br />
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<strong>Zertifikat gültig bis:</strong> @sig.CertificateValidUntil.ToString("dd.MM.yyyy")<br />
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<small class="text-muted">Issuer: @sig.CertificateIssuer</small>
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</div>
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}
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</div>
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}
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}
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@if (!string.IsNullOrEmpty(Model.ErrorMessage))
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{
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<div class="alert alert-danger mt-4">
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<i class="dx-icon-warning"></i> <strong>Fehler:</strong> @Model.ErrorMessage
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</div>
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}
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<div class="alert alert-light mt-4">
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<h6>?? Test-Schritte:</h6>
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<ol class="mb-0">
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<li>PDF-Datei auswählen (z.B. eine ZUGFeRD-Rechnung aus <code>/Invoices</code>)</li>
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<li>Auf "PDF signieren" klicken</li>
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<li>Signierte PDF wird in <code>C:\PdfResults</code> gespeichert</li>
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<li>Mit Adobe Acrobat Reader öffnen und Signatur prüfen</li>
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</ol>
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</div>
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</div>
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82
DXApp.TemplateKitProject/Pages/TestSignature.cshtml.cs
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DXApp.TemplateKitProject/Pages/TestSignature.cshtml.cs
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using DXApp.TemplateKitProject.Services;
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using Microsoft.AspNetCore.Mvc;
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using Microsoft.AspNetCore.Mvc.RazorPages;
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namespace DXApp.TemplateKitProject.Pages;
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public class TestSignatureModel(
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PdfSigningService signingService,
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IConfiguration configuration,
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ILogger<TestSignatureModel> logger) : PageModel
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{
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[BindProperty]
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public IFormFile? PdfFile { get; set; }
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public bool Success { get; private set; }
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public string? ErrorMessage { get; private set; }
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public string? OriginalFileName { get; private set; }
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public long OriginalSizeKb { get; private set; }
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public string? SignedFileName { get; private set; }
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public long SignedSizeKb { get; private set; }
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public string? OutputPath { get; private set; }
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public List<SignatureInformation>? SignatureInfo { get; private set; }
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public void OnGet()
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{
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}
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public async Task<IActionResult> OnPostAsync()
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{
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if (PdfFile is null || PdfFile.Length == 0)
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{
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ModelState.AddModelError(nameof(PdfFile), "Bitte eine PDF-Datei auswählen.");
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return Page();
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}
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if (!PdfFile.FileName.EndsWith(".pdf", StringComparison.OrdinalIgnoreCase))
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{
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ModelState.AddModelError(nameof(PdfFile), "Nur PDF-Dateien sind erlaubt.");
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return Page();
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}
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try
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{
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OriginalFileName = PdfFile.FileName;
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// PDF in Byte-Array laden
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using var memStream = new MemoryStream();
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await PdfFile.CopyToAsync(memStream);
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var originalBytes = memStream.ToArray();
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OriginalSizeKb = originalBytes.Length / 1024;
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logger.LogInformation("Signiere PDF: {FileName} ({Size} KB)", OriginalFileName, OriginalSizeKb);
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// PDF signieren
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var signedBytes = await signingService.SignPdfAsync(originalBytes);
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SignedSizeKb = signedBytes.Length / 1024;
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// Speichern
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var outputDir = configuration["PdfResults:OutputDirectory"] ?? Path.GetTempPath();
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Directory.CreateDirectory(outputDir);
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SignedFileName = Path.GetFileNameWithoutExtension(PdfFile.FileName) + "_signed.pdf";
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OutputPath = Path.Combine(outputDir, SignedFileName);
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await System.IO.File.WriteAllBytesAsync(OutputPath, signedBytes);
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logger.LogInformation("Signierte PDF gespeichert: {Path}", OutputPath);
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// Signatur-Informationen auslesen
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SignatureInfo = await signingService.GetSignatureInfoAsync(signedBytes);
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Success = true;
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}
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catch (Exception ex)
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{
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logger.LogError(ex, "Fehler beim Signieren der PDF: {FileName}", PdfFile.FileName);
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ErrorMessage = ex.Message;
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}
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return Page();
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}
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}
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