add license

.github/workflows/ci.yml

@@ -0,0 +1,12 @@
+name: CI
+on: [push]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: lts
+      - run: npm ci
+      - run: npm test

README.md

@@ -1,2 +1,9 @@
-# withdraw
-Withdraw funds from an IE over HTTP, with gas fees deducted
+# wallet-screening
+
+HTTP API for screening wallet addresses.
+
+## GET `/:address`
+
+Reponses:
+- `200 OK`
+- `403 Forbidden`

bin/station-wallet-screening.js

@@ -0,0 +1,10 @@
+import http from 'node:http'
+import { once } from 'node:events'
+import { handler } from '../index.js'
+
+const { PORT = 8080 } = process.env
+
+const server = http.createServer(handler)
+server.listen(PORT)
+await once(server, 'listening')
+console.log(`http://127.0.0.1:${PORT}`)

index.js

@@ -0,0 +1,11 @@
+import { STATUS_CODES } from 'node:http'
+
+const forbiddenAddresses = new Set([
+  '0xFORBIDDEN'
+])
+
+export const handler = (req, res) => {
+  const address = req.url.split('/')[1].trim()
+  res.statusCode = forbiddenAddresses.has(address) ? 403 : 200
+  res.end(STATUS_CODES[res.statusCode])
+}