get nsec from ssm

Makefile

@@ -1,6 +1,7 @@
 setup:
 	export EAGER_SERVICE_LOADING=1 \
-		   SERVICES=lambda,ssm \
+		   SERVICES=lambda,ssm,kms \
+		   LAMBDA_EXECUTOR=docker \
 		   AWS_ACCESS_KEY_ID=test \
 		   AWS_SECRET_ACCESS_KEY=test
 	dockerd &
@@ -17,6 +18,12 @@ setup:
 	awslocal ssm put-parameter \
 		--name /rss-nostr-lambda/last-run-time \
 		--value "2023-11-23T14:46:56Z" \
+		--type "String" \
+		--overwrite
+	awslocal ssm put-parameter \
+		--name /rss-nostr-lambda/nsec \
+		--value "nsec1eg458xl7d3eywld94rpfx8daa6h2hqfqxylmk43dz6ep8q388e2sfe4thg" \
+		--type "SecureString" \
 		--overwrite
 	rm handler.zip
 
@@ -25,7 +32,7 @@ invoke:
 		--region us-east-1 \
 	   	--function-name rss-nostr-lambda \
 		--cli-binary-format raw-in-base64-out \
-		--payload '{"feedUrl":"https://nitter.1d4.us/culturaltutor/rss","nostrNsec":"nsec1eg458xl7d3eywld94rpfx8daa6h2hqfqxylmk43dz6ep8q388e2sfe4thg","lastRunTimeParam":"/rss-nostr-lambda/last-run-time"}' \
+		--payload '{"feedUrl":"https://nitter.1d4.us/culturaltutor/rss","nostrNsecParam":"/rss-nostr-lambda/nsec","lastRunTimeParam":"/rss-nostr-lambda/last-run-time"}' \
 		response.json
 
 invoke-dryrun:
@@ -33,7 +40,7 @@ invoke-dryrun:
 		--region us-east-1 \
 	   	--function-name rss-nostr-lambda \
 		--cli-binary-format raw-in-base64-out \
-		--payload '{"dryRun":true,"feedUrl":"https://nitter.1d4.us/culturaltutor/rss","nostrNsec":"nsec1eg458xl7d3eywld94rpfx8daa6h2hqfqxylmk43dz6ep8q388e2sfe4thg","lastRunTimeParam":"/rss-nostr-lambda/last-run-time"}' \
+		--payload '{"dryRun":true,"feedUrl":"https://nitter.1d4.us/culturaltutor/rss","nostrNsecParam":"/rss-nostr-lambda/nsec","lastRunTimeParam":"/rss-nostr-lambda/last-run-time"}' \
 		response.json
 
 recreate:

README.md

@@ -1,3 +1,22 @@
 # 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](https://nixos.wiki/wiki/Development_environment_with_nix-shell) 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](https://nixos.wiki/wiki/Nix_package_manager) you will need to configure your environment manually. You will need the following dependencies:
+
+- [awscliv2](https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-welcome.html) is used for creating and updating resources in AWS.
+- [LocalStack](https://docs.localstack.cloud/getting-started/) is a service that mocks AWS services locally on your machine.
+- [Docker](https://docs.docker.com/engine/install/) is used by LocalStack under the hood. You'll need the Docker daemon up and running to use LocalStack.
+- [awscli-local](https://github.com/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](https://www.gnu.org/software/make/manual/make.html) 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 under the `/rss-nostr-lambda` path in Parameter Store; be sure to [grant the proper permissions](https://docs.aws.amazon.com/systems-manager/latest/userguide/ps-integration-lambda-extensions.html) or this function will fail.

index.mjs

@@ -27,7 +27,7 @@ const htmlToAscii = html => {
 export const handler = async (event) => {
     const region = process.env.AWS_REGION || "us-east-1"
     const feed = event.feedUrl
-    const privkey = toHexString(event.nostrNsec)
+    const nostrNsecParam = event.nostrNsecParam
     const lastRunTimeParam = event.lastRunTimeParam
     const dryrun = event.dryRun
 
@@ -42,13 +42,12 @@ export const handler = async (event) => {
     }
 
     const ssmClient = new SSMClient({ region })
-    const params = {
-        Name: lastRunTimeParam 
-    }
-    const ssmGetCommand = new GetParameterCommand(params);
+    const ssmGetLastRunCommand = new GetParameterCommand({
+        Name: lastRunTimeParam
+    });
 
     let since = new Date()
-    await ssmClient.send(ssmGetCommand)
+    await ssmClient.send(ssmGetLastRunCommand)
         .then(data => {
             since = data.Parameter.Value
         }).catch(err => {
@@ -56,7 +55,21 @@ export const handler = async (event) => {
             response.errors.push(err)
             return response
         })
-    
+
+    const ssmGetNsecCommand = new GetParameterCommand({
+        Name: nostrNsecParam,
+        WithDecryption: true
+    })
+
+    let privkey = ''
+    await ssmClient.send(ssmGetNsecCommand)
+        .then(data => {
+            privkey = toHexString(data.Parameter.Value)
+        }).catch(err => {
+            console.dir(err)
+            response.errors.push(err)
+            return response
+        })
 
     if (feed === "") {
         console.dir("feedUrl was not set.")
@@ -100,7 +113,6 @@ export const handler = async (event) => {
         })
 
         if (dryrun) {
-            console.dir(ndkEvent)
             response.successes++
             continue
         }
@@ -111,12 +123,12 @@ export const handler = async (event) => {
             if (published) {
                 response.successes++
                 
-                params.Name = lastRunTimeParam
-                params.Value = new Date().toISOString()
-                params.Type = "String"
-                params.Overwrite = true
-
-                const ssmPutCommand = new PutParameterCommand(params)
+                const ssmPutCommand = new PutParameterCommand({
+                    Name: lastRunTimeParam,
+                    Value: new Date().toISOString(),
+                    Type: "String",
+                    Overwrite: true
+                })
                 await ssmClient.send(ssmPutCommand)
                     .catch(err => {
                         console.dir(err)