AWS API Gateway to S3 File Upload Tutorial for Developers

API Gateway is a fully managed service that makes it easy for developers to create, publish, maintain, monitor, and secure APIs at any scale.

To upload files to S3 using API Gateway, you'll need to create an API and a resource, then attach a method to handle the file upload.

API Gateway supports multiple integration types, including HTTP, Lambda, and S3.

In this tutorial, we'll focus on integrating API Gateway with S3 to upload files directly to an S3 bucket.

This approach allows for seamless file uploads without the need for additional infrastructure or code.

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To set up IAM roles and policies, we create a new IAM role and policy that grants the API Gateway the necessary permissions to upload objects to our S3 bucket. This step emphasizes the principle of least privilege, ensuring the API Gateway has no more access than necessary.

The policy looks something like this: we need to create a policy that allows the role to perform the put object action in the specified S3 bucket.

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We proceed to create a new role specifically for this API Gateway, selecting API Gateway as the service and adding the required permissions. This ensures the API Gateway has the necessary permissions to interact with the S3 bucket.

After defining the policy, we attach it to our newly created IAM role, empowering our API Gateway to interact with the specified S3 bucket. This step ensures that the API Gateway has the necessary permissions to upload objects to our S3 bucket.

We create a policy that allows the role to perform the put object action in the specified S3 bucket, and associate the policy with the role. This is done by going back to the IAM roles section, selecting the role, and attaching the policy to it.

To ensure the API Gateway can handle JPEG images, we declare the expected binary content type as image/jpeg in the integration settings. This configuration is crucial for the seamless transfer of images through the API.

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To create a gateway and resources for your AWS upload file to S3 API, start by navigating to the API Gateway in the AWS Management Console. Choose the REST API option and provide a name for the API.

Select the regional endpoint Type and click on "Create API." This will create the API Gateway.

Next, define the S3 bucket that stores the files that will be uploaded by creating a resource and naming it {bucket}.

To create an API Gateway, navigate to the API Gateway menu in the AWS Management Console and click on "Create API." Choose the REST API option and provide a name for the API.

The API Gateway can be created using the AWS Management Console, AWS CLI, or through a framework that helps build serverless apps, such as Serverless Framework.

Select the regional endpoint type and click on "Create API" to create the API Gateway. This will allow you to create resources and methods for your API.

Curious to learn more? Check out: Serverless Aws S3 Api Gateway Upload Portal

For the selected integration type, specify the AWS region and the Simple Storage Service (S3) as the service. Provide the bucket and key (object name) parameters using the method request path and the path override feature.

To create an API Gateway with an endpoint backed by an AWS Lambda function, create a REST API and name it something. Then, create a resource and name the resource {bucket}.

Create a method within the file_upload resource, making it a GET method and adding the ARN of the previously created Lambda function. Make sure to check the Lambda Proxy Integration.

The Lambda function should appear under the GET method and in the Lambda function it should show as a trigger now. Finally, hit deploy API! and add any stage name you use “dev” usually.

You can create the API Gateway directly using the API Gateway and S3 integration method, eliminating the need for an intermediate Lambda function and reducing latency and cost.

To create the API Gateway, navigate to the API Gateway menu and click on "Create API." Choose the REST API option and provide a name for the API. Select the regional endpoint type and click on "Create API."

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Setting binary media types is a crucial step in handling file uploads, like JPEG images, through your API Gateway. To do this, you need to configure the binary media types in the API Gateway settings.

Include the "image/jpeg" media type, which corresponds to JPEG images, as an example of the type of binary data you're working with. This ensures the API Gateway can correctly identify and process the uploaded files.

In the API Gateway settings, specify the binary media types that will be handled by your API. This includes the "image/jpeg" type for JPEG images.