const NotificationProvider = require("./notification-provider"); const { relayInit, getPublicKey, getEventHash, getSignature, nip04, nip19 } = require("nostr-tools"); // polyfills for node versions const semver = require("semver"); const nodeVersion = process.version; if (semver.lt(nodeVersion, "20.0.0")) { // polyfills for node 18 global.crypto = require("crypto"); global.WebSocket = require("isomorphic-ws"); } else { // polyfills for node 20 global.WebSocket = require("isomorphic-ws"); } class Nostr extends NotificationProvider { name = "nostr"; /** * @inheritdoc */ async send(notification, msg, monitorJSON = null, heartbeatJSON = null) { // All DMs should have same timestamp const createdAt = Math.floor(Date.now() / 1000); const senderPrivateKey = await this.getPrivateKey(notification.sender); const senderPublicKey = getPublicKey(senderPrivateKey); const recipientsPublicKeys = await this.getPublicKeys(notification.recipients); // Create NIP-04 encrypted direct message event for each recipient const events = []; for (const recipientPublicKey of recipientsPublicKeys) { const ciphertext = await nip04.encrypt(senderPrivateKey, recipientPublicKey, msg); let event = { kind: 4, pubkey: senderPublicKey, created_at: createdAt, tags: [[ "p", recipientPublicKey ]], content: ciphertext, }; event.id = getEventHash(event); event.sig = getSignature(event, senderPrivateKey); events.push(event); } // Publish events to each relay const relays = notification.relays.split("\n"); let successfulRelays = 0; // Connect to each relay for (const relayUrl of relays) { const relay = relayInit(relayUrl); try { await relay.connect(); successfulRelays++; // Publish events for (const event of events) { relay.publish(event); } } catch (error) { continue; } finally { relay.close(); } } // Report success or failure if (successfulRelays === 0) { throw Error("Failed to connect to any relays."); } return `${successfulRelays}/${relays.length} relays connected.`; } /** * Get the private key for the sender * @param {string} sender Sender to retrieve key for * @returns {nip19.DecodeResult} Private key */ async getPrivateKey(sender) { try { const senderDecodeResult = await nip19.decode(sender); const { data } = senderDecodeResult; return data; } catch (error) { throw new Error(`Failed to get private key: ${error.message}`); } } /** * Get public keys for recipients * @param {string} recipients Newline delimited list of recipients * @returns {Promise} Public keys */ async getPublicKeys(recipients) { const recipientsList = recipients.split("\n"); const publicKeys = []; for (const recipient of recipientsList) { try { const recipientDecodeResult = await nip19.decode(recipient); const { type, data } = recipientDecodeResult; if (type === "npub") { publicKeys.push(data); } else { throw new Error("not an npub"); } } catch (error) { throw new Error(`Error decoding recipient: ${error}`); } } return publicKeys; } } module.exports = Nostr;