Open and save PDF document in AWS Lambda

20 Jan 20256 minutes to read

The Syncfusion® .NET Core PDF library is used to create, read, and edit PDF documents programatically without the dependency of Adobe Acrobat. Using this library, open and save PDF document in AWS Lambda.

Steps to open and save PDF document in AWS Lambda

Step 1: Create a new AWS Lambda project as follows.
AWS Lambda project

Step 2: Select the Blueprint as Empty Function and click Finish.
Select Blueprint as Empty Function

Step 3: Install the Syncfusion.Pdf.Net.Core NuGet package as a reference to your project from NuGet.org.
Install NuGet package

NOTE

Starting with v16.2.0.x, if you reference Syncfusion® assemblies from the trial setup or NuGet feed, you also have to add the “Syncfusion.Licensing” assembly reference and include a license key in your projects. Please refer to this link to registering the Syncfusion® license key in your application to use our components.

Step 4: Create a folder and copy the required data files, and include the files in the project.
Create a folder

Step 5: Set the copy to the output directory to Copy if newer to all the data files.
Property change for data files

Step 6: Include the following namespaces in Function.cs file.

using Syncfusion.Pdf.Parsing;
using Syncfusion.Pdf;
using Syncfusion.Pdf.Graphics;
using Syncfusion.Pdf.Grid;
using Syncfusion.Drawing;

step 7: Add the following code sample in Function.cs to open a PDF document in AWS Lambda.

//Open an existing PDF document.
FileStream document = new FileStream("Input.pdf", FileMode.Open, FileAccess.Read);
PdfLoadedDocument document = new PdfLoadedDocument(stream);

Step 8: Add the below code example to add a table in the PDF document.

//Load the existing page.
PdfLoadedPage loadedPage = document.Pages[0] as PdfLoadedPage;
//Create PDF graphics for the page.
PdfGraphics graphics = loadedPage.Graphics;

//Create a PdfGrid.
PdfGrid pdfGrid = new PdfGrid();
//Add values to the list.
List<object> data = new List<object>();
Object row1 = new { Product_ID = "1001", Product_Name = "Bicycle", Price = "10,000" };
Object row2 = new { Product_ID = "1002", Product_Name = "Head Light", Price = "3,000" };
Object row3 = new { Product_ID = "1003", Product_Name = "Break wire", Price = "1,500" };
data.Add(row1);
data.Add(row2);
data.Add(row3);
//Add list to IEnumerable.
IEnumerable<object> dataTable = data;
//Assign data source.
pdfGrid.DataSource = dataTable;
//Apply built-in table style.
pdfGrid.ApplyBuiltinStyle(PdfGridBuiltinStyle.GridTable4Accent3);
//Draw the grid to the page of PDF document.
pdfGrid.Draw(graphics, new RectangleF(40, 400, loadedPage.Size.Width - 80, 0));

Step 9: Add the following code example to save the PDF document in AWS Lambda.

//Save the document into stream.
MemoryStream memoryStream = new MemoryStream();
//Save and Close the PDF Document.
document.Save(memoryStream);
document.Close(true);
return Convert.ToBase64String(memoryStream.ToArray());

Step 10: Right-click the project and select Publish to AWS Lambda.
Publish to AWS Lambda

Step 11: Create a new AWS profile in the Upload Lambda Function Window. After creating the profile, add a name for the Lambda function to publish. Then, click Next.
Upload Lambda Function

Step 12: In the Advanced Function Details window, specify the Role Name based on AWS Managed policy. After selecting the role, click Upload button to deploy your application.
Advance Function Details

Step 13:See the published Lambda function in the AWS console after deploying the application.
After deploying the application

Step 14: Edit the Memory size and Timeout as maximum in Basic settings of the AWS Lambda function.
AWS Lambda Function

Steps to post the request to AWS Lambda

Step 1: Create a new console project.
Create a console project

step 2: Install the following Nuget packages in your application from Nuget.org.

Install Nuget Package

Step 3: Include the following namespaces in Program.cs file.

using Amazon;
using Amazon.Lambda;
using Amazon.Lambda.Model;
using Newtonsoft.Json;

Step 4: Add the following code sample in Program.cs to invoke the published AWS Lambda function using the function name and access keys.

//Create a new AmazonLambdaClient
AmazonLambdaClient client = new AmazonLambdaClient("awsaccessKeyID", "awsSecreteAccessKey", RegionEndpoint.USEast2);
//Create new InvokeRequest with published function name.
InvokeRequest invoke = new InvokeRequest
{
    FunctionName = "MyNewFunction",
    InvocationType = InvocationType.RequestResponse,
    Payload = "\"Test\""
};
//Get the InvokeResponse from client InvokeRequest
InvokeResponse response = await client.InvokeAsync(invoke);
//Read the response stream
var stream = new StreamReader(response.Payload);
JsonReader reader = new JsonTextReader(stream);
var serilizer = new JsonSerializer();
var responseText = serilizer.Deserialize(reader);
//Convert Base64String into PDF document
byte[] bytes = Convert.FromBase64String(responseText.ToString());
FileStream fileStream = new FileStream("Sample.pdf", FileMode.Create);
BinaryWriter writer = new BinaryWriter(fileStream);
writer.Write(bytes, 0, bytes.Length);
writer.Close();
System.Diagnostics.Process.Start("Sample.pdf");

By executing the program, you will get the a PDF document as follows.

Open and save a PDF document in AWS Lambda

From GitHub, you can download the console application and AWS Lambda project.

Click here to explore the rich set of Syncfusion® PDF library features.