Aws signature postman tutorial11/23/2023 ![]() That brings us to the next point - the canonical string. The signature that was created by signing the hashed canonical string ![]() Not all headers need to be included, so you need to specify if any optional headers were included - otherwise the signature calculation will fail on the AWS end. This indicates the headers that were in the canonical string, which is used to calculate the signature. It consists of the principal ID (AKIA****************), the date the request was sent (20200320), the scoped region (ap-southeast-2), the service being called (execute-api), and the request type (aws4_request). This indicates the particular signature type and signing algorithm used. This is in contrast to a JWT, which only signs claims that are asserted by the authorization server and does not contain any information about the particular request that is being sent. The signature contains information about the request itself, and is signed with an access key and secret of the user making the request. It is a special signature that is applied to a request in the Authorization header. IAM Authorization uses a different method to validate that requests are authorized, and it is called AWS Signature V4. It may help to go over the client tool generation section that I wrote previously. Can we do the same when using IAM Authorization? Of course we can! Let's see how!Īll code for this tutorial is available here. This allowed us to write tests in javascript that could be used for end-to-end testing of the API. In previous installments though, I showed how to set up generate client code from our OpenAPI definition, and then apply the JWT to the header. We used Postman to test our API because it is easy way to set up Authorization headers that are compatible with IAM authorization. We also used IAM authorization instead of using JWTs. In doing so, we switched out the persistence layer to DynamoDB, and moved to VTL-based service integrations over lambdas. In a previous installment, we investigated converting over the HTTP API we had built to a REST API. ![]() Please reach out to me on Twitter if you have any questions!
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