Save document to AWS S3

18 Nov 20188 minutes to read

To save a document to AWS S3, you can follow the steps below

Step 1: Create a Simple Document Editor Sample in ASP.NET Core

Start by following the steps provided in this link to create a simple Document Editor sample in ASP.NET Core. This will give you a basic setup of the Document Editor component.

Step 2: Modify the DocumentEditorController.cs File in the Web Service Project

  • Open the DocumentEditorController.cs file in your web service project.

  • Import the required namespaces at the top of the file:

using System.IO;
using Amazon;
using Amazon.S3;
using Amazon.S3.Model;
  • Add the following private fields and constructor parameters to the DocumentEditorController class, In the constructor, assign the values from the configuration to the corresponding fields
private IConfiguration _configuration;
public readonly string _accessKey;
public readonly string _secretKey;
public readonly string _bucketName;

public DocumentEditorController(IWebHostEnvironment hostingEnvironment, IMemoryCache cache, IConfiguration configuration)
{
  _hostingEnvironment = hostingEnvironment;
  _cache = cache;
  _configuration = configuration;
  _accessKey = _configuration.GetValue<string>("AccessKey");
  _secretKey = _configuration.GetValue<string>("SecretKey");
  _bucketName = _configuration.GetValue<string>("BucketName");
}
  • Create the SaveToS3() method to save the document to AWS S3 bucket
[AcceptVerbs("Post")]
[HttpPost]
[EnableCors("AllowAllOrigins")]
[Route("SaveToS3")]
//Post action for save the document to AWS S3

public void SaveToS3(IFormCollection data)
{
  if (data.Files.Count == 0)
    return;
  RegionEndpoint bucketRegion = RegionEndpoint.USEast1;
  // Configure the AWS SDK with your access credentials and other settings
  var s3Client = new AmazonS3Client(_accessKey, _secretKey, bucketRegion);
  string bucketName = _bucketName;
  IFormFile file = data.Files[0];
  string documentName = this.GetValue(data, "documentName");
  string result = Path.GetFileNameWithoutExtension(documentName);
  Stream stream = new MemoryStream();
  file.CopyTo(stream);
  var request = new PutObjectRequest
  {
    BucketName = bucketName,
    Key = result + "_downloaded.docx",
    InputStream = stream,
  };
  // Upload the document to AWS S3
  var response = s3Client.PutObjectAsync(request).Result;
}

private string GetValue(IFormCollection data, string key)
{
    if (data.ContainsKey(key))
    {
        string[] values = data[key];
        if (values.Length > 0)
        {
            return values[0];
        }
    }
    return "";
}
  • Open the appsettings.json file in your web service project, Add the following lines below the existing "AllowedHosts" configuration
{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "AllowedHosts": "*",
  "AccessKey": "Your Access Key from AWS S3",
  "SecretKey": "Your Secret Key from AWS S3",
  "BucketName": "Your Bucket name from AWS S3"
}

NOTE

Replace Your Access Key from AWS S3, Your Secret Key from AWS S3, and Your Bucket name from AWS S3 with your actual AWS access key, secret key and bucket name

Step 3: Modify the Index.cshtml File in the Document Editor sample

In the client-side, to export the document into blob the document using saveAsBlob and sent to server-side for saving in AWS S3 Bucket.

<ejs-button id="export">Save to AWS S3 Bucket</ejs-button>
<ejs-documenteditorcontainer id="container"></ejs-documenteditorcontainer>
<script>
    var documenteditor;
    document.addEventListener('DOMContentLoaded', function () {
        var documenteditorElement = document.getElementById("container");        
        container = documenteditorElement.ej2_instances[0];
        document.getElementById('export').addEventListener('click', function () {
            container.documentEditor.saveAsBlob('Docx').then((blob) => {
                var exportedDocument = blob;
                //Now, save the document where ever you want.
                var formData = new FormData();
                formData.append('documentName', container.documentEditor.documentName);
                formData.append('data', exportedDocument);
                /* tslint:disable */
                var req = new XMLHttpRequest();
                // Replace your running Url here
                req.open(
                    'POST',
                    window.baseurl + 'api/documenteditor/SaveToS3',
                    true
                );
                req.onreadystatechange = () => {
                    if (req.readyState === 4) {
                        if (req.status === 200 || req.status === 304) {
                            console.log('Saved sucessfully');
                        }
                    }
                };
                req.send(formData);
            });
        });
    }); 
</script>
public ActionResult Default()
{
    return View();
}

NOTE

The AWSSDK.S3 NuGet package must be installed in your application to use the previous code example.