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rss-nostr-lambda

An AWS Lambda function that posts content found in an RSS feed to Nostr.

Running Locally

Local environment

A nix-shell development environment is configured in this repo. You can use it by running nix-shell from within the project directory. This is the easiest way to get started working with this application.

If you are not running nix you will need to configure your environment manually. You will need the following dependencies:

awscliv2 is used for creating and updating resources in AWS.
LocalStack is a service that mocks AWS services locally on your machine.
Docker is used by LocalStack under the hood. You'll need the Docker daemon up and running to use LocalStack.
awscli-local is a thin wrapper around the awscli which provides the awslocal command and allows you to call awscli commands without needing to provide the --endpoint=http://localhost:xxxx for LocalStack on each call.

Makefile

A Makefile has been set up to bundle some of the commands used to set up and use this Lambda.

Running in AWS

This function runs in AWS Lambda and uses SSM to store state like the last-run-time. The function will read and write parameters in Parameter Store under the paths provided in the event spec below; be sure to grant the proper permissions or this function will fail.

The function requires the AWS_REGION environment variable to be set. This should already be set for you by AWS Lambda.

Event Specification

This Lambda function expects the following event to be passed in:

{
    "feedUrl": String - The url of the RSS feed,
    "nostrNsecParam": String - The path of the SSM parameter holding the nsec,
    "lastRunTimeParam": String - The path of the SSM parameter holding the last run time
}

Things to be awre of

The following are not ideal and may be changed in the future:

This function uses a checkpointing algorithm based on the last run time. If the last run time is set to too long of a timeframe this function will timeout and misbehave. It's recommended to set the last run time to something recent -- like the last day or two.
This function does not generalize a way to provide the path to the needed data in the RSS feed.
This function hard-codes in the https://nostr.build URL. This is tightly coupled to using that service and provides no alternatives.
- Further, if the function fails to upload the image to https://nostr.build it will simply remove the image entirely. There's room to improve this.

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