working rss feed to nostr publish

index.mjs

@@ -0,0 +1,82 @@
+import 'websocket-polyfill'
+import { extract } from '@extractus/feed-extractor'
+import NDK, { NDKEvent, NDKPrivateKeySigner, NDKRelay, NDKRelaySet } from '@nostr-dev-kit/ndk'
+import { bytesToHex, utf8ToBytes } from '@noble/hashes/utils'
+import bech32 from 'bech32-buffer'
+
+const toHexString = nsec => {
+    let buffer = bech32.decode(nsec).data
+    return buffer.reduce((s, byte) => {
+        let hex = byte.toString(16);
+        if (hex.length === 1) hex = '0' + hex;
+        return s + hex;
+    }, '');
+}
+    
+
+export const handler = async (event) => {
+    const region = process.env.AWS_REGION || "us-east-1"
+    const feed = event.feedUrl
+    const privkey = toHexString(event.nostrNsec)
+    const since = event.since
+
+    if (feed === "") {
+        console.error("feedUrl was not set.")
+        return {
+            statusCode: 400,
+            body: "feedUrl must be provided in payload."
+        }
+    }
+
+    let response = {
+        totalItems: 0,
+        successes: 0,
+        errors: []
+    }
+
+    const ndk = new NDK({
+        signer: new NDKPrivateKeySigner(privkey),
+        explicitRelayUrls: [
+            "wss://nostr.mom",
+            "wss://nostr.snort.social",
+            "wss://nostr.lol"
+        ]
+    })
+
+    await ndk.connect(6000).catch(err => {
+        console.error(err)
+        response.errors.push ("failed to connect to relay", err)
+        return response
+    })
+
+    let rss = await extract(feed)
+        .catch(err => {
+            console.error(err.error);
+            return response
+        })
+
+    let filtered = rss.entries.filter(item => Date.parse(item.published) >= Date.parse(since))
+    response.totalItems = filtered.length
+
+    for (let item of filtered) {
+        let ndkEvent = new NDKEvent(ndk, {
+            kind: 1,
+            pubkey: ndk.signer.user().hexpubkey,
+            content: item.title,
+            created_at: Math.floor(Date.now() / 1000),
+        })
+
+        try {
+            const published = await ndkEvent.publish()
+            if (published) {
+                response.successes++
+            }
+        } catch(e) {
+            console.error(e)
+            response.errors.push(e)
+        }
+    }
+
+    return response
+}
+