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Merge pull request #52 from SyncfusionExamples/EJ2-973011-eSignPdf
897552: Sample on How to Create User Based eSign PDF Forms
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‎How to/Create User Based eSign PDF Forms/Controllers/HomeController.cs

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading.Tasks;
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using Microsoft.AspNetCore.Http;
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using Microsoft.AspNetCore.Mvc;
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using Microsoft.AspNetCore.Hosting;
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using Microsoft.Extensions.Caching.Memory;
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using Syncfusion.EJ2.PdfViewer;
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using System.IO;
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using Newtonsoft.Json;
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using Syncfusion.Pdf.Parsing;
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using System.Security.Cryptography.X509Certificates;
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using Syncfusion.Pdf.Security;
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using Syncfusion.Pdf;
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using System.Net;
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#if REDIS
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using Microsoft.Extensions.Caching.Distributed;
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#endif
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namespace ESigningSimpleSample.Controllers
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{
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public partial class HomeController : Controller
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{
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private IMemoryCache _cache;
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private readonly IWebHostEnvironment _hostingEnvironment;
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#if REDIS
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private IDistributedCache _distributedCache;
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public PdfViewerController(IMemoryCache memoryCache, IDistributedCache distributedCache, IWebHostEnvironment hostingEnvironment)
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#else
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public HomeController(IMemoryCache memoryCache, IWebHostEnvironment hostingEnvironment)
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#endif
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{
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_cache = memoryCache;
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#if REDIS
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_distributedCache = distributedCache;
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#endif
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_hostingEnvironment = hostingEnvironment;
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}
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// GET: Default
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public ActionResult Index()
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{
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return View();
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}
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public ActionResult ESigningPdfForms()
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{
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return View();
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}
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[AcceptVerbs("Post")]
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[HttpPost]
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[Route("api/[controller]/FlattenDownload")]
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public IActionResult FlattenDownload([FromBody] Dictionary<string, string> jsonObject)
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{
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try
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{
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string documentBase = "";
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// Check if the request contains base64String (from custom JavaScript call)
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if (jsonObject != null && jsonObject.ContainsKey("base64String"))
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{
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documentBase = jsonObject["base64String"];
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}
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// Handle base64 string processing safely
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string base64String = "";
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if (documentBase.Contains("data:application/pdf;base64,"))
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{
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base64String = documentBase.Split(new string[] { "data:application/pdf;base64," }, StringSplitOptions.None)[1];
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}
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else
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{
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// Assume it's already just the base64 data without the prefix
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base64String = documentBase;
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}
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byte[] byteArray = Convert.FromBase64String(base64String);
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PdfLoadedDocument loadedDocument = new PdfLoadedDocument(byteArray);
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if (loadedDocument.Form != null)
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{
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loadedDocument.FlattenAnnotations();
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loadedDocument.Form.Flatten = true;
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}
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//Save the PDF document.
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MemoryStream stream = new MemoryStream();
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//Save the PDF document
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loadedDocument.Save(stream);
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stream.Position = 0;
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//Close the document
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loadedDocument.Close(true);
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string updatedDocumentBase = Convert.ToBase64String(stream.ToArray());
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documentBase = "data:application/pdf;base64," + updatedDocumentBase;
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return Content(documentBase);
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}
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catch (Exception ex)
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{
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return BadRequest($"Error processing PDF: {ex.Message}");
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}
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}
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}
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}

‎How to/Create User Based eSign PDF Forms/ESigningSimpleSample.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="Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation" Version="8.0.0" />
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<PackageReference Include="Microsoft.Extensions.Caching.Redis" Version="2.2.0" Condition="$(DefineConstants.Contains('REDIS'))" />
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<PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="8.0.0" />
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<PackageReference Include="Syncfusion.EJ2.AspNet.Core" Version="27.1.57" />
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<PackageReference Include="Syncfusion.EJ2.PdfViewer.AspNet.Core.Windows" Version="27.1.57" />
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<PackageReference Include="Syncfusion.SkiaSharpHelper.Net.Core" Version="27.1.57" />
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<PackageReference Include="System.Net.Http" Version="4.3.4" />
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<PackageReference Include="System.Text.RegularExpressions" Version="4.3.1" />
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</ItemGroup>
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</Project>

‎How to/Create User Based eSign PDF Forms/ESigningSimpleSample.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/Create User Based eSign PDF Forms/ESigningSimpleSample.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 = 17.10.34818.151
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ESigningSimpleSample", "ESigningSimpleSample.csproj", "{B3F357A0-E249-4330-A8BE-C50E7248CF9F}"
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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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{B3F357A0-E249-4330-A8BE-C50E7248CF9F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{B3F357A0-E249-4330-A8BE-C50E7248CF9F}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{B3F357A0-E249-4330-A8BE-C50E7248CF9F}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{B3F357A0-E249-4330-A8BE-C50E7248CF9F}.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 = {7B65EB19-C66B-4322-ABAB-679E7F0E9DE4}
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EndGlobalSection
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EndGlobal

‎How to/Create User Based eSign PDF Forms/Models/ErrorViewModel.cs

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namespace ESigningSimpleSample.Models
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{
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public class ErrorViewModel
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{
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public string? RequestId { get; set; }
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public bool ShowRequestId => !string.IsNullOrEmpty(RequestId);
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}
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}

‎How to/Create User Based eSign PDF Forms/NuGet.config

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<?xml version="1.0" encoding="utf-8"?>
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<configuration>
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<packageSources>
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<clear />
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<add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
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</packageSources>
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<fallbackPackageFolders>
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<clear />
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</fallbackPackageFolders>
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<disabledPackageSources>
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<clear />
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</disabledPackageSources>
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</configuration>

‎How to/Create User Based eSign PDF Forms/Program.cs

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using Newtonsoft.Json.Serialization;
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var builder = WebApplication.CreateBuilder(args);
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// Add services to the container.
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builder.Services.AddControllersWithViews();
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builder.Services.AddControllers().AddNewtonsoftJson(options =>
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{
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// Use the default property (Pascal) casing
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options.SerializerSettings.ContractResolver = new DefaultContractResolver();
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});
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var app = builder.Build();
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// Configure the HTTP request pipeline.
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if (!app.Environment.IsDevelopment())
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{
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app.UseExceptionHandler("/Home/Error");
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// The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
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app.UseHsts();
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}
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app.UseHttpsRedirection();
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app.UseStaticFiles();
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app.UseRouting();
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app.UseAuthorization();
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app.MapControllerRoute(
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name: "default",
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pattern: "{controller=Home}/{action=Index}/{id?}");
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app.Run();

‎How to/Create User Based eSign PDF Forms/Properties/launchSettings.json

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{
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"$schema": "http://json.schemastore.org/launchsettings.json",
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"iisSettings": {
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"windowsAuthentication": false,
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"anonymousAuthentication": true,
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"iisExpress": {
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"applicationUrl": "http://localhost:59435",
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"sslPort": 44320
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}
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},
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"profiles": {
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"http": {
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"commandName": "Project",
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"dotnetRunMessages": true,
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"launchBrowser": true,
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"applicationUrl": "http://localhost:5229",
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"environmentVariables": {
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"ASPNETCORE_ENVIRONMENT": "Development"
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}
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},
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"https": {
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"commandName": "Project",
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"dotnetRunMessages": true,
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"launchBrowser": true,
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"applicationUrl": "https://localhost:7252;http://localhost:5229",
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"environmentVariables": {
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"ASPNETCORE_ENVIRONMENT": "Development"
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}
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},
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"IIS Express": {
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"commandName": "IISExpress",
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"launchBrowser": true,
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"environmentVariables": {
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"ASPNETCORE_ENVIRONMENT": "Development"
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}
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}
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}
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}

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