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EshwariBalraj
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991842- Digital signature sample is committed
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‎How to/Secure Document Signing with PDF Digital Signature Support/client-side/app.js‎

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‎How to/Secure Document Signing with PDF Digital Signature Support/client-side/index.html‎

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‎How to/Secure Document Signing with PDF Digital Signature Support/server-side/DigitalSignServer/Controllers/PdfViewerController.cs‎

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using Microsoft.AspNetCore.Cors;
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using Microsoft.AspNetCore.Hosting;
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using Microsoft.AspNetCore.Mvc;
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using Syncfusion.Drawing;
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using Syncfusion.Pdf;
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using Syncfusion.Pdf.Graphics;
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using Syncfusion.Pdf.Parsing;
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using Syncfusion.Pdf.Security;
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.IO;
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using System.Text.Json;
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namespace DigitalSignServer.Controllers
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{
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[ApiController]
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[Route("api/[controller]")]
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public class PdfViewerController : ControllerBase
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{
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private readonly IWebHostEnvironment _env;
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private IConfiguration _configuration;
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public PdfViewerController(IWebHostEnvironment env, IConfiguration configuration)
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{
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_env = env;
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_configuration = configuration;
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path = _configuration["DOCUMENT_PATH"];
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path = string.IsNullOrEmpty(path) ? Path.Combine(env.ContentRootPath, "Data") : Path.Combine(env.ContentRootPath, path);
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}
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string path;
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private class Bounds
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{
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public int X { get; set; }
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public int Y { get; set; }
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public int Height { get; set; }
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public int Width { get; set; }
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}
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// POST: /api/PdfViewer/AddVisibleSignature
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[HttpPost]
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[EnableCors("AllowAllOrigins")]
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[Route("AddVisibleSignature")]
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public IActionResult AddVisibleSignature([FromBody] Dictionary<string, object> jsonObject)
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{
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if (jsonObject != null && jsonObject.ContainsKey("pdfdata"))
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{
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string pdfdata = jsonObject["pdfdata"]?.ToString() ?? string.Empty;
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string[] split = pdfdata.Split(new string[] { "data:application/pdf;base64," }, StringSplitOptions.None);
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if (split.Length > 1)
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{
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string pdfdataString = split[1];
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if (!string.IsNullOrEmpty(pdfdataString))
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{
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// Load the PDF
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byte[] documentBytes = Convert.FromBase64String(pdfdataString);
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using PdfLoadedDocument loadedDocument = new PdfLoadedDocument(documentBytes);
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// Existing field (first field) if user chose an existing field
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PdfLoadedSignatureField formField = null;
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if (loadedDocument.Form?.Fields?.Count > 0)
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{
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formField = loadedDocument.Form.Fields[0] as PdfLoadedSignatureField;
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}
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// First page
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PdfPageBase loadedPage = loadedDocument.Pages[0];
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// Certificate (update file name/password as needed)
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PdfCertificate pdfCertificate = new PdfCertificate(GetDocumentPath("localhost.pfx"), "Syncfusion@123");
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// Optional signature image
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PdfImage image = null;
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if (jsonObject.ContainsKey("imagedata"))
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{
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string imageData = jsonObject["imagedata"]?.ToString() ?? string.Empty;
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string[] imgSplit = imageData.Split(new string[] {
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"data:image/png;base64,", "data:image/jpeg;base64,", "data:image/jpg;base64,"
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}, StringSplitOptions.None);
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if (imgSplit.Length > 1 && !string.IsNullOrEmpty(imgSplit[1]))
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{
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byte[] imageBytes = Convert.FromBase64String(imgSplit[1]);
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MemoryStream imageStream = new MemoryStream(imageBytes);
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image = new PdfBitmap(imageStream);
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}
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}
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// Signature text
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PdfStandardFont font = new PdfStandardFont(PdfFontFamily.Helvetica, 8);
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PdfSignature signature;
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string descriptionText = "";
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string signerName = "";
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string reason = "";
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string locationInfo = "";
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DateTime signingDate = DateTime.Now;
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if (jsonObject.ContainsKey("signerName"))
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{
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signerName = jsonObject["signerName"]?.ToString() ?? "";
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if (!string.IsNullOrEmpty(signerName))
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descriptionText += "Digitally signed by " + signerName + "\n";
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}
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if (jsonObject.ContainsKey("reason"))
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{
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reason = jsonObject["reason"]?.ToString() ?? "";
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if (!string.IsNullOrEmpty(reason))
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descriptionText += "Reason: " + reason + "\n";
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}
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if (jsonObject.ContainsKey("location"))
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{
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locationInfo = jsonObject["location"]?.ToString() ?? "";
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if (!string.IsNullOrEmpty(locationInfo))
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descriptionText += "Location: " + locationInfo + "\n";
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}
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if (jsonObject.ContainsKey("date"))
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{
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string dateStr = jsonObject["date"]?.ToString() ?? "";
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if (!string.IsNullOrWhiteSpace(dateStr))
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{
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descriptionText += "Date: " + dateStr;
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var formats = new[] { "MM-dd-yyyy", "MM-dd-yy" }; // support both if needed
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if (!DateTime.TryParseExact(dateStr, formats, CultureInfo.InvariantCulture,
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DateTimeStyles.None, out var givenDate))
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{
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return BadRequest($"Invalid date format: {dateStr}. Expected MM-dd-yyyy.");
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}
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signingDate = new DateTime(
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givenDate.Year, givenDate.Month, givenDate.Day,
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signingDate.Hour, signingDate.Minute, signingDate.Second);
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}
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}
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string displayMode = jsonObject.ContainsKey("displayMode")
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? jsonObject["displayMode"]?.ToString() ?? ""
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: "";
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bool isSignatureField = jsonObject.ContainsKey("isSignatureField")
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&& bool.TryParse(jsonObject["isSignatureField"]?.ToString(), out bool v) && v;
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if (isSignatureField)
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{
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// Sign existing field
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loadedDocument.FlattenAnnotations();
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signature = new PdfSignature(loadedDocument, loadedPage, pdfCertificate, "Signature", formField, signingDate);
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if (!string.Equals(displayMode, "SIGNER DETAILS ONLY", StringComparison.OrdinalIgnoreCase) && image != null && formField != null)
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{
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float boundsWidth = formField.Bounds.Width * 0.57f;
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if (string.Equals(displayMode, "IMAGE ONLY", StringComparison.OrdinalIgnoreCase) || descriptionText.Length == 0)
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boundsWidth = formField.Bounds.Width;
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float boundsHeight = formField.Bounds.Height;
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Bounds imgBounds = GetVisibleSignImageBounds(boundsHeight, boundsWidth, image.Height, image.Width);
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signature.Appearance.Normal.Graphics.DrawImage(
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image,
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imgBounds.X, imgBounds.Y,
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imgBounds.Width, imgBounds.Height
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);
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}
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}
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else
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{
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// New signature with given bounds
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signature = new PdfSignature(loadedDocument, loadedPage, pdfCertificate, "Signature", signingDate);
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Bounds signatureBounds = JsonSerializer.Deserialize<Bounds>(
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jsonObject["signatureBounds"]?.ToString() ?? "{}",
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new JsonSerializerOptions { PropertyNameCaseInsensitive = true }
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);
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signature.Bounds = new Rectangle(signatureBounds.X, signatureBounds.Y, signatureBounds.Width, signatureBounds.Height);
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if (!string.Equals(displayMode, "SIGNER DETAILS ONLY", StringComparison.OrdinalIgnoreCase) && image != null)
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{
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float boundsWidth = signatureBounds.Width * 0.57f;
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if (string.Equals(displayMode, "IMAGE ONLY", StringComparison.OrdinalIgnoreCase) || descriptionText.Length == 0)
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boundsWidth = signatureBounds.Width;
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float boundsHeight = signatureBounds.Height;
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Bounds imgBounds = GetVisibleSignImageBounds(boundsHeight, boundsWidth, image.Height, image.Width);
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signature.Appearance.Normal.Graphics.DrawImage(
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image,
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imgBounds.X, imgBounds.Y,
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imgBounds.Width, imgBounds.Height
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);
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}
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}
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// Draw signer details text (if requested)
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if (!string.Equals(displayMode, "IMAGE ONLY", StringComparison.OrdinalIgnoreCase) && descriptionText.Length > 0)
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{
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PdfStringFormat format = new PdfStringFormat
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{
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Alignment = PdfTextAlignment.Left,
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LineAlignment = PdfVerticalAlignment.Middle
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};
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if (string.Equals(displayMode, "WITH SIGNER DETAILS", StringComparison.OrdinalIgnoreCase))
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{
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signature.Appearance.Normal.Graphics.DrawString(
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descriptionText,
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font,
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PdfBrushes.Black,
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new RectangleF(signature.Bounds.Width * 0.6f, 0, signature.Bounds.Width * 0.4f, signature.Bounds.Height),
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format
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);
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}
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else
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{
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signature.Appearance.Normal.Graphics.DrawString(
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descriptionText,
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font,
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PdfBrushes.Black,
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new RectangleF(0, 0, signature.Bounds.Width, signature.Bounds.Height),
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format
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);
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}
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}
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// Signature settings
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if (jsonObject.ContainsKey("signatureType") || jsonObject.ContainsKey("digestAlgorithm"))
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{
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PdfSignatureSettings settings = signature.Settings;
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if (jsonObject.ContainsKey("signatureType"))
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{
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string sigType = jsonObject["signatureType"]?.ToString() ?? "";
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if (string.Equals(sigType, "CADES", StringComparison.OrdinalIgnoreCase))
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settings.CryptographicStandard = CryptographicStandard.CADES;
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else if (string.Equals(sigType, "CMS", StringComparison.OrdinalIgnoreCase))
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settings.CryptographicStandard = CryptographicStandard.CMS;
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}
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if (jsonObject.ContainsKey("digestAlgorithm"))
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{
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string algo = jsonObject["digestAlgorithm"]?.ToString() ?? "";
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settings.DigestAlgorithm = (DigestAlgorithm)Enum.Parse(typeof(DigestAlgorithm), algo, ignoreCase: true);
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}
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}
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signature.Certificated = true;
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// Save
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using MemoryStream str = new MemoryStream();
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loadedDocument.Save(str);
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loadedDocument.Close(true);
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byte[] docBytes = str.ToArray();
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string docBase64 = "data:application/pdf;base64," + Convert.ToBase64String(docBytes);
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return Content(docBase64);
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}
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}
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}
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return Content("data:application/pdf;base64,");
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}
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private Bounds GetVisibleSignImageBounds(float boundsHeight, float boundsWidth, float imageHeight, float imageWidth)
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{
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// calculate aspect ratios
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float imageAspect = imageWidth / imageHeight;
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float boundsAspect = boundsWidth / boundsHeight;
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float drawWidth, drawHeight, offsetX, offsetY;
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if (imageAspect > boundsAspect)
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{
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// Image is wider relative to bounds
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drawWidth = boundsWidth;
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drawHeight = boundsWidth / imageAspect;
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offsetX = 0;
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offsetY = (boundsHeight - drawHeight) / 2;
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}
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else
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{
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// Image is taller relative to bounds
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drawHeight = boundsHeight;
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drawWidth = boundsHeight * imageAspect;
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offsetX = (boundsWidth - drawWidth) / 2;
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offsetY = 0;
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}
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return new Bounds() { X = (int)offsetX, Y = (int)offsetY, Width = (int)drawWidth, Height = (int)drawHeight };
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}
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private string GetDocumentPath(string document)
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{
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if (!System.IO.File.Exists(document))
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{
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string documentPath = Path.Combine(path, document);
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if (System.IO.File.Exists(documentPath))
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return documentPath;
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else
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return string.Empty;
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}
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else
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return document;
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}
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}
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}

‎How to/Secure Document Signing with PDF Digital Signature Support/server-side/DigitalSignServer/Data/localhost.pfx‎

2.6 KB
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‎How to/Secure Document Signing with PDF Digital Signature Support/server-side/DigitalSignServer/DigitalSignServer.csproj‎

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<Project Sdk="Microsoft.NET.Sdk.Web">
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<PropertyGroup>
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<TargetFramework>net8.0</TargetFramework>
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<Nullable>enable</Nullable>
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<ImplicitUsings>enable</ImplicitUsings>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
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<PackageReference Include="Syncfusion.Pdf.Net.Core" Version="31.2.5" />
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</ItemGroup>
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</Project>

‎How to/Secure Document Signing with PDF Digital Signature Support/server-side/DigitalSignServer/DigitalSignServer.csproj.user‎

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<?xml version="1.0" encoding="utf-8"?>
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<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<PropertyGroup>
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<ActiveDebugProfile>IIS Express</ActiveDebugProfile>
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</PropertyGroup>
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<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
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<DebuggerFlavor>ProjectDebugger</DebuggerFlavor>
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</PropertyGroup>
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</Project>

‎How to/Secure Document Signing with PDF Digital Signature Support/server-side/DigitalSignServer/DigitalSignServer.sln‎

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 17
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VisualStudioVersion = 17.14.36301.6 d17.14
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DigitalSignServer", "DigitalSignServer.csproj", "{2C5CADA7-D8AA-48A3-A23F-E6A8B3756674}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{2C5CADA7-D8AA-48A3-A23F-E6A8B3756674}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{2C5CADA7-D8AA-48A3-A23F-E6A8B3756674}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{2C5CADA7-D8AA-48A3-A23F-E6A8B3756674}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{2C5CADA7-D8AA-48A3-A23F-E6A8B3756674}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {FC77C64E-CF6F-4714-8E86-7FB39B234386}
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EndGlobalSection
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EndGlobal

‎How to/Secure Document Signing with PDF Digital Signature Support/server-side/DigitalSignServer/Program.cs‎

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using Newtonsoft.Json.Serialization;
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using Syncfusion.Licensing;
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var builder = WebApplication.CreateBuilder(args);
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var MyAllowSpecificOrigins = "AllowAllOrigins";
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builder.Services.AddControllers();
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builder.Services.AddCors(options =>
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{
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options.AddPolicy(name: MyAllowSpecificOrigins,
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builder => {
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builder.AllowAnyOrigin()
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.AllowAnyMethod()
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.AllowAnyHeader();
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});
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});
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var app = builder.Build();
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app.MapGet("/", () => "Hello World!");
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app.UseHttpsRedirection();
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app.UseCors(MyAllowSpecificOrigins);
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app.MapControllers();
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app.Run();

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