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Use of Bearer Token with AWS API Gateway

One kind of access token that is often used in OAuth 2.0 authentication is the bearer token. They are contained in an HTTP request’s Authorization header. To use certain AWS services, we must first obtain an AWS STS service bearer token in order to use their resources with code. These services use an authentication that requires a bearer token.

The AWS service obtains the token on the behalf when we use AWS CLI or API actions that need bearer tokens. After that, we receive the token, which we can use to continue using that service. The format of the header appears as follows:

Working

1. We must set up an authorizer in order to use Bearer tokens to secure the API Gateway endpoints.

2. Lambda functions and other techniques that confirm the accuracy of the client submitting an API request are known as authorizers.

3. To manage Bearer tokens, we set up an authorizer in the API Gateway panel.

4. Select the suitable authorizer type, such as the “Lambda Function” kind.

5. After receiving the request, the authorizer function reads the Authorization header and retrieves the Bearer token.

6. We validate the Bearer token in the Lambda function.

7. Decoding the token, checking its sign, and confirming its expiration are some examples of validation.

8. The authorizer decides whether to provide authorization based on the token validation.

9. The authorizer creates an IAM policy allowing access if the token is valid and the client has the needed authorizations.

10. The authorizer creates a deny policy if the client does not have permissions or if the token is incorrect.

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Conclusion

To sum up, our Tech team went over the details of using a bearer token with AWS API Gateway.