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.NET Core

File Upload

The following sections describe how to handle file uploads on your server using .Net Core as a server-side language. For information on the upload workflow refer to the file upload documentation.

Frontend

Setting up the index page.

  1. On the head section include the Editor style.

  2. <!DOCTYPE html>
    <html>
    <head>
    <meta charset="utf-8">
    
    <link href="https://cdn.jsdelivr.net/npm/froala-editor@latest/css/froala_editor.pkgd.min.css" rel="stylesheet" type="text/css" />
    </head>
  3. On the body section include the Editor JS files and define the area for the editor.

  4. <body>  
    <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/froala-editor@latest/js/froala_editor.pkgd.min.js"></script>
    
    <div class="sample">
    <h2>File upload example.</h2>
    <form>
    <textarea id="edit" name="content"></textarea>
    </form>
    </div>
    
  5. Initialize the editor and set the file upload URL

  6. <script>
    new FroalaEditor('#edit', {
    // Set the file upload URL.
    fileUploadURL: '/UploadFiles',
    
    fileUploadParams: {
    id: 'my_editor'
    }
    })
    </script>
    </body>
    </html>

The full code should look like this:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link href="https://cdn.jsdelivr.net/npm/froala-editor@latest/css/froala_editor.pkgd.min.css" rel="stylesheet" type="text/css" />
</head>

<body>
<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/froala-editor@latest/js/froala_editor.pkgd.min.js"></script>

<div class="sample">
<h2>File upload example.</h2>
<form>
<textarea id="edit" name="content"></textarea>
</form>
</div>


<script>
new FroalaEditor('#edit', {

fileUploadURL: '/UploadFiles',

fileUploadParams: {
id: 'my_editor'
}
})
</script>
</body>
</html>

Backend

In this example HomeController.cs is the default controller used to define the upload action. The uploads directory is created automatically if it does not exist under wwwroot/upload/. The root directory must be writable, otherwise the upload directory will not be created.

HomeController manages the request and the upload action. If the uploaded file passes the validation step, the server responds with a JSON object containing a link to the uploaded file.

e.g.: {"link":"http://server_address/upload/name_of_file"}.

The following example shows the functions you should define in this file:

public class HomeController : Controller
{
private readonly IHostingEnvironment _hostingEnvironment;

public HomeController(IHostingEnvironment hostingEnvironment)
{
_hostingEnvironment = hostingEnvironment;
}

HttpPost("UploadFiles")]
[Produces("application/json")]
public async Task<IActionResult> Post(List<IFormFile> files)
{
// Get the file from the POST request
var theFile = HttpContext.Request.Form.Files.GetFile("file");

// Get the server path, wwwroot
string webRootPath = _hostingEnvironment.WebRootPath;

// Building the path to the uploads directory
var fileRoute = Path.Combine(webRootPath, "uploads");

// Get the mime type
var mimeType = HttpContext.Request.Form.Files.GetFile("file").ContentType;

// Get File Extension
string extension = System.IO.Path.GetExtension(theFile.FileName);

// Generate Random name.
string name = Guid.NewGuid().ToString().Substring(0, 8) + extension;

// Build the full path inclunding the file name
string link = Path.Combine(fileRoute, name);

// Create directory if it does not exist.
FileInfo dir = new FileInfo(fileRoute);
dir.Directory.Create();

// Basic validation on mime types and file extension
string[] fileMimetypes = { "text/plain", "application/msword", "application/x-pdf", "application/pdf", "application/json","text/html" };
string[] fileExt = { ".txt", ".pdf", ".doc",".json",".html" };

try
{
if (Array.IndexOf(fileMimetypes, mimeType) >= 0 && (Array.IndexOf(fileExt, extension) >= 0))
{
// Copy contents to memory stream.
Stream stream;
stream = new MemoryStream();
theFile.CopyTo(stream);
stream.Position = 0;
String serverPath = link;

// Save the file
using (FileStream writerFileStream = System.IO.File.Create(serverPath))
{
await stream.CopyToAsync(writerFileStream);
writerFileStream.Dispose();
}

// Return the file path as json
Hashtable fileUrl = new Hashtable();
fileUrl.Add("link", "/uploads/" + name);

return Json(fileUrl);
}
throw new ArgumentException("The file did not pass the validation");
}

catch (ArgumentException ex)
{
return Json(ex.Message);
}
}
}

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