Prevent (restrict) PDF file from download and print in ASP.Net MVC

tanws8

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User: tanws8
Posted: on Jan 30, 2021 04:44 AM
Forum: ASP.Net MVC
Replies: 3
Views: 9858
Sample Code: Download

I am using FileResult to return a PDF.

My code works but is there a way to disallow users to download/print and click (copy the words) from the PDF?

This is my code that i am using. I am using a javascript code to call the code below.

const GetArticleTab = (obj) => {
    window.open("@Url.Action("ReturnFile", "Product")?fileName=" + obj, '_blank', 'toolbar = 0, location = 0, menubar = 0');
};

public FileResult ReturnFile(string fileName) {
    string str_URL = //location of the file
    byte[] _byte = System.IO.File.ReadAllBytes(str_URL);

    return File(_byte, "application/pdf");
}

What I want is display the PDF document for users to view but they are not allow to download/print/or copy the text as it is a sensitive document that is only available for paid users.

Download FREE API for Word, Excel and PDF in ASP.Net

dharmend...

0 1

Reply
User: dharmendr
Replied: on Jan 30, 2021 04:49 AM
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Hi tanws8,

Change the return type of your method to ActionResult.

based on the use

public ActionResult GetReport(string id)
{    
    // Check condition.
    if (Role == "User")
    {
        byte[] fileBytes = GetBytes(id);
        return File(fileBytes, MediaTypeNames.Application.Octet, "test.pdf");
    }
    else 
    {
        // Redirect to index or do wat you want.
        return RedirectToAction("Index");
    }
}

tanws8

0 2

Reply
User: tanws8
Replied: on Jan 31, 2021 06:11 PM
Modified: on Jan 31, 2021 06:15 PM
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Hi dharmendr,

The code you provided downloads the PDF document directly.

This is my code that i am using. I am using a javascript code to call the code below.

const GetArticleTab = (obj) => { window.open("@Url.Action("ReturnFile", "Product")?fileName=" + obj, '_blank', 'toolbar = 0, location = 0, menubar = 0'); };

public FileResult ReturnFile(string fileName) { string str_URL = //location of the file byte[] _byte = System.IO.File.ReadAllBytes(str_URL);

return File(_byte, "application/pdf"); }

What I want is display the PDF document for users to view but they are not allow to download/print/or copy the text as it is a sensitive document that is only available for paid users.

dharmend...

0 3

Reply
User: dharmendr
Replied: on Feb 01, 2021 06:35 AM
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Hi tanws8,

You can secure the PDF by setting the password and have to share the password to paid user, so that they can open it.

Non paid user can download the PDF but without the password they can't view the content.

For password you may apply any logic to share the password to paid user by email of sms.

Refer below code to download password protected pdf. For this example i have set default password. You can change your logic.

Model

public class FileModel
{
    public string FileName { get; set; }
}

Namespaces

using System.IO;
using iTextSharp.text.pdf;

Controller

public class HomeController : Controller
{
    // GET: Home
    public ActionResult Index()
    {
        string[] filePaths = Directory.GetFiles(Server.MapPath("~/Files/"));
        List<FileModel> files = new List<FileModel>();
        foreach (string filePath in filePaths)
        {
            files.Add(new FileModel { FileName = Path.GetFileName(filePath) });
        }

        return View(files);
    }

    public FileResult DownloadFile(string fileName)
    {
        string path = Server.MapPath("~/Files/") + fileName;
        byte[] bytes = System.IO.File.ReadAllBytes(path);

        using (MemoryStream input = new MemoryStream(bytes))
        {
            using (MemoryStream output = new MemoryStream())
            {
                string password = "pass@123";
                PdfReader reader = new PdfReader(input);
                PdfEncryptor.Encrypt(reader, output, true, password, password, PdfWriter.ALLOW_SCREENREADERS);
                bytes = output.ToArray();

                return File(bytes, "application/pdf");
            }
        }
    }
}

View

@using File_Folder_Download_MVC.Models
@model List<FileModel>

@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
</head>
<body>
    <table>
        <tr>
            <th>File Name</th>
            <th></th>
        </tr>
        @foreach (FileModel file in Model)
        {
            <tr>
                <td>@file.FileName</td>
                <td>@Html.ActionLink("Download", "DownloadFile", new { fileName = file.FileName }, new { target = "_blank" })</td>
            </tr>
        }
    </table>
</body>
</html>

Screenshot

I agree, here is the link: https://www.e-iceblue.com/Introduce/spire-office-for-net-free.html

Prevent (restrict) PDF file from download and print in ASP.Net MVC

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