initial

.gitignore

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+node_modules
+package-lock.json

README.md

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+# Nostr Playgraound to SC24
+  
+ Prepare the environment by installing a docker container with the Nostr relay server.
+ 
+ ```shell
+ docker pull scsibug/nostr-rs-relay
+ docker run -p 7000:8080 scsibug/nostr-rs-relay
+```
+ 
+ Install the necessary dependencies by running the following commands:
+
+ ```shell
+git clone https://git.rpi-virtuell.de/Comenius-Institut/nostr-oer-client
+cd nostr-oer-client
+npm install
+```
+
+ Run the script on your shell with the following command: `node listen.js`
+ This script listens for new messages on the Nostr network.
+ It connects to a Nostr relay server and subscribes to text notes/messages.
+ When a new message is received, it prints the message content, sender's public key, and timestamp.
+ 
+ Test with the send.js script to send a message.
+ run the send.js script with the following command: `node send.js`
+ 

createEventTextNote.js

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+import { finalizeEvent, getEventHash, getPublicKey } from 'nostr-tools'
+
+const skHex = 'e8913a0b983c8678e3cce83a45ace14f6656bd06ff98803a38d72a5567e7e105'
+
+const event = {
+    kind: 1,
+    created_at: Math.floor(Date.now() / 1000),
+    tags: [],
+    content: 'Hello world! Welcome to SC24!',
+    pubkey: getPublicKey(skHex)
+}
+
+event.id = getEventHash(event)
+event.sig = finalizeEvent(event, skHex)
+
+const signedEvent = ['EVENT', event]
+
+function getCircularReplacer() {
+    const seen = new WeakSet();
+    return (key, value) => {
+        if (typeof value === "object" && value !== null) {
+            if (seen.has(value)) {
+                return; //zyklische Referenzen lassen sich nicht anzeigen
+            }
+            seen.add(value);
+        }
+        return value;
+    };
+}
+
+console.log(
+    JSON.stringify(signedEvent, getCircularReplacer(), 2) // 2 für schönere Einrückung
+)

generateKeys.js

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+/**
+ * This script generates a secret key and a public key.
+ * to run this script, use the following command: node generateKeys.js
+ */
+import { bytesToHex, hexToBytes } from '@noble/hashes/utils'
+import { generateSecretKey, getPublicKey } from 'nostr-tools/pure'
+
+const secretKey = generateSecretKey();
+const publicKey = getPublicKey(secretKey);
+
+
+let skHex = bytesToHex(secretKey)
+let backToBytes = hexToBytes(skHex)
+
+console.log('your sekret key:', skHex)
+console.log('your public key = ', publicKey); 

listen.js

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+/**
+ * Prepare the environment by installing a docker container with the Nostr relay server.
+ * docker pull scsibug/nostr-rs-relay
+ * docker run -p 7000:8080 scsibug/nostr-rs-relay
+ * 
+ * Install the necessary dependencies by running the following command:
+ * npm install
+ * 
+ * Run the script with the following command: node listen.js
+ * This script listens for new messages on the Nostr network.
+ * It connects to a Nostr relay server and subscribes to text notes/messages.
+ * When a new message is received, it prints the message content, sender's public key, and timestamp.
+ * 
+ * Test with the send.js script to send a message.
+ * run the send.js script with the following command: node send.js
+ */
+
+
+import { Relay } from 'nostr-tools/relay'
+import { verifyEvent } from 'nostr-tools/pure'
+
+// If not running in Node.js, comment the following 3 lines:
+import WebSocket from 'ws'
+import { useWebSocketImplementation } from 'nostr-tools/relay'
+useWebSocketImplementation(WebSocket)
+
+const RELAY_URL = 'ws://localhost:7000' // Replace with your preferred relay
+
+async function listenForMessages() {
+  try {
+    const relay = await Relay.connect(RELAY_URL)
+    console.log(`Connected to ${relay.url}`)
+
+    const sub = relay.subscribe(
+      [
+        {
+          kinds: [1], // Listen for text notes/messages
+          since: Math.floor(Date.now() / 1000) // Only get new messages from now on
+        }
+      ],
+      {
+        onevent(event) {
+          if (verifyEvent(event)) {
+            console.log('New message received:')
+            console.log(`From: ${event.pubkey}`)
+            console.log(`Content: ${event.content}`)
+            console.log(`Timestamp: ${new Date(event.created_at * 1000).toLocaleString()}`)
+            console.log('---')
+          } else {
+            console.log('Received an invalid event')
+          }
+        },
+        oneose() {
+          console.log('Subscription stream ended')
+        },
+        onerror(error) {
+          console.error('Subscription error:', error)
+        }
+      }
+    )
+
+    // Keep the script running
+    process.on('SIGINT', () => {
+      console.log('Closing subscription and relay connection')
+      sub.close()
+      relay.close()
+      process.exit()
+    })
+
+  } catch (error) {
+    console.error('Error connecting to relay:', error)
+  }
+}
+
+listenForMessages()

package.json

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+{
+  "dependencies": {
+    "nostr-tools": "^2.7.2",
+    "ws": "^8.18.0"
+  },
+  "name": "nostr-oer-client",
+  "type": "module",
+  "version": "1.0.0",
+  "main": "createEventTextNote.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "description": ""
+}

send.js

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+import { bytesToHex, hexToBytes } from '@noble/hashes/utils' // already an installed dependency
+import { generateSecretKey, getPublicKey, finalizeEvent } from 'nostr-tools/pure'
+import { Relay } from 'nostr-tools/relay'
+import WebSocket from 'ws';
+
+// Provide WebSocket implementation to nostr-tools
+global.WebSocket = WebSocket;
+
+// Generate keys (or use existing ones)
+//let secretKey = generateSecretKey()
+//let pk = getPublicKey(secretKey)
+//let sk = bytesToHex(secretKey)
+let sk = 'e8913a0b983c8678e3cce83a45ace14f6656bd06ff98803a38d72a5567e7e105';
+
+
+
+// Create event template
+let eventTemplate = {
+  kind: 1,
+  created_at: Math.floor(Date.now() / 1000),
+  tags: [],
+  content: 'Hello world! Welcome to SC24!',
+}
+
+// Finalize and sign the event
+const signedEvent = finalizeEvent(eventTemplate, sk)
+
+// Connect to a relay and publish
+async function publishMessage() {
+  const relay = await Relay.connect('ws://localhost:7000')
+  console.log(`connected to ${relay.url}`)
+
+  await relay.publish(signedEvent)
+  console.log('Event published!')
+
+  relay.close()
+}
+
+publishMessage()

yarn.lock

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+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
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+  resolved "https://registry.npmjs.org/@noble/ciphers/-/ciphers-0.5.3.tgz"
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+
+"@noble/curves@~1.1.0":
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+  resolved "https://registry.npmjs.org/@noble/curves/-/curves-1.1.0.tgz"
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+  dependencies:
+    "@noble/hashes" "1.3.1"
+
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+  resolved "https://registry.npmjs.org/@noble/curves/-/curves-1.2.0.tgz"
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+  dependencies:
+    "@noble/hashes" "1.3.2"
+
+"@noble/hashes@~1.3.0", "@noble/hashes@~1.3.1", "@noble/hashes@1.3.1":
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+  resolved "https://registry.npmjs.org/@noble/hashes/-/hashes-1.3.1.tgz"
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+
+"@noble/hashes@1.3.2":
+  version "1.3.2"
+  resolved "https://registry.npmjs.org/@noble/hashes/-/hashes-1.3.2.tgz"
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+
+"@scure/base@~1.1.0", "@scure/base@1.1.1":
+  version "1.1.1"
+  resolved "https://registry.npmjs.org/@scure/base/-/base-1.1.1.tgz"
+  integrity sha512-ZxOhsSyxYwLJj3pLZCefNitxsj093tb2vq90mp2txoYeBqbcjDjqFhyM8eUjq/uFm6zJ+mUuqxlS2FkuSY1MTA==
+
+"@scure/bip32@1.3.1":
+  version "1.3.1"
+  resolved "https://registry.npmjs.org/@scure/bip32/-/bip32-1.3.1.tgz"
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+  dependencies:
+    "@noble/curves" "~1.1.0"
+    "@noble/hashes" "~1.3.1"
+    "@scure/base" "~1.1.0"
+
+"@scure/bip39@1.2.1":
+  version "1.2.1"
+  resolved "https://registry.npmjs.org/@scure/bip39/-/bip39-1.2.1.tgz"
+  integrity sha512-Z3/Fsz1yr904dduJD0NpiyRHhRYHdcnyh73FZWiV+/qhWi83wNJ3NWolYqCEN+ZWsUz2TWwajJggcRE9r1zUYg==
+  dependencies:
+    "@noble/hashes" "~1.3.0"
+    "@scure/base" "~1.1.0"
+
+nostr-tools@^2.7.2:
+  version "2.7.2"
+  resolved "https://registry.npmjs.org/nostr-tools/-/nostr-tools-2.7.2.tgz"
+  integrity sha512-Bq3Ug0SZFtgtL1+0wCnAe8AJtI7yx/00/a2nUug9SkhfOwlKS92Tef12iCK9FdwXw+oFZWMtRnSwcLayQso+xA==
+  dependencies:
+    "@noble/ciphers" "^0.5.1"
+    "@noble/curves" "1.2.0"
+    "@noble/hashes" "1.3.1"
+    "@scure/base" "1.1.1"
+    "@scure/bip32" "1.3.1"
+    "@scure/bip39" "1.2.1"
+  optionalDependencies:
+    nostr-wasm v0.1.0
+
+nostr-wasm@v0.1.0:
+  version "0.1.0"
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+
+ws@^8.18.0:
+  version "8.18.0"
+  resolved "https://registry.npmjs.org/ws/-/ws-8.18.0.tgz"
+  integrity sha512-8VbfWfHLbbwu3+N6OKsOMpBdT4kXPDDB9cJk2bJ6mh9ucxdlnNvH1e+roYkKmN9Nxw2yjz7VzeO9oOz2zJ04Pw==