Appears fixed Crypto-Key header

crypto_playpen/message.txt

@@ -0,0 +1 @@
+hello!

crypto_playpen/privatekey.pem

@@ -0,0 +1,5 @@
+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEIOjRzTX6T5FkhmOscZZdGp1b1PuOgk2p/YoJ7abFaJPPoAoGCCqGSM49
+AwEHoUQDQgAEQazvs+7/4y9drkN8RZCB3ZCFVhMZQLtcJmgeY5x9+RXqYE18VHJs
+qagywecu9JLckZFFcraOX2hsifyEPQgCYw==
+-----END EC PRIVATE KEY-----

crypto_playpen/public_key.bin

@@ -0,0 +1 @@
+A¬ï³îÿã/]®C|E��Ý�…V@»\&hcœ}ùê`M|Trl©¨2Áç.ô’Ü‘‘Er¶Ž_hl‰ü„=c

crypto_playpen/publickey.pem

@@ -0,0 +1,4 @@
+-----BEGIN PUBLIC KEY-----                                         
+MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEQazvs+7/4y9drkN8RZCB3ZCFVhMZ
+QLtcJmgeY5x9+RXqYE18VHJsqagywecu9JLckZFFcraOX2hsifyEPQgCYw==
+-----END PUBLIC KEY-----

keys.md

@@ -0,0 +1,67 @@
+
+# NOTES on working with Cryptographic Keys
+
+Since the VAPID key pair was created using cyprto.createECDH we could reconstitute our public key
+using only the private key:
+```
+    const curveName = 'prime256v1';
+    const ecdh = crypto.createECDH(curveName);
+    const privateKeyBuffer = Buffer.from(privateKey, 'base64');
+    ecdh.setPrivateKey(privateKeyBuffer);
+    const rawPublicKeyBuffer = ecdh.getPublicKey();
+    
+```
+
+Unfortunately, crypto module creates only "raw" keys.  And when working with jsonwebtoken.sign method
+we must have a PEM or something with ASN metadata.  So, we create PEMs using eckeys-util module:
+
+```
+    const pems = ecKeyUtils.generatePem({curveName, privateKey: ecdh.getPrivateKey(), publicKey: rawPublicKeyBuffer });
+
+    console.log("privateKey: ", pems.privateKey);
+    console.log();
+    console.log("publicKey: ", pems.publicKey);
+
+    const jwtToken = jwt.sign(jwtInfo, pems.privateKey, { algorithm: 'ES256' });
+```
+
+
+I trie here to create my own ASN1 metadata but this seems doomed due to ignorance of what were the required
+components:
+```
+    const asn1Header = Buffer.from('3059301306072a8648ce3d020106082a8648ce3d030107034200', 'hex');
+    const derPublicKeyBuffer = Buffer.concat([asn1Header, rawPublicKeyBuffer]);
+    const base64DerPublicKey = derPublicKeyBuffer.toString('base64');
+    console.log("base64DerPublicKey: ", base64DerPublicKey)
+```
+Such an approach creates a DER key pair. An alternative to that method is:
+```
+    const ders = ecKeyUtils.generateDer({curveName, privateKey: ecdh.getPrivateKey(), publicKey: rawPublicKeyBuffer });
+    console.log("privateKey: ", ders.privateKey);
+    console.log("publicKey: ", ders.publicKey);
+```
+
+... using eckeys-util again ... but I'm not 100% sure if these have all the necessary ASN1 metadata AND
+the DER key will produce this error ...
+
+```
+Error: secretOrPrivateKey must be an asymmetric key when using ES256
+    at module.exports [as sign] (/usr/src/app/node_modules/jsonwebtoken/sign.js:124:22)
+
+```
+... when used in the sign method.  So, apparently, sign does not like the DER binary format but it is
+fine with PEM.
+
+## When sending a notification request to the Mozilla endpoint it does not like the Crypto-Key header:
+
+```
+{
+  "code":400,
+  "errno":110,
+  "error":"Bad Request",
+  "message":"Invalid aes128gcm Crypto-Key header",
+  "more_info":"http://autopush.readthedocs.io/en/latest/http.html#error-codes"
+}
+
+```
+

src/notificationService.ts

@@ -1,5 +1,6 @@
 import VapidService from './vapidService.js';
 import { VapidKeys } from './VapidKeys.js';
+import { IncomingMessage } from 'http';
 import * as https from 'https';
 import * as http_ece from 'http_ece';
 import crypto from 'crypto';
@@ -19,6 +20,9 @@ export interface BrowserSubscription {
   };
 }
 
+interface MyIncomingMessage extends IncomingMessage {
+  errno?: number;
+}
 
 export class NotificationService {
     private static instance: NotificationService;
@@ -39,6 +43,7 @@ export class NotificationService {
         await this.pushToEndpoint(subscription, message);
     }
 
+
     private async pushToEndpoint(subscription: BrowserSubscription, message: Message): Promise<void> {
         const payloadString = JSON.stringify(message);
 	const payloadBuffer = Buffer.from(payloadString, 'utf-8');
@@ -55,27 +60,29 @@ export class NotificationService {
             method: 'POST',
             hostname: parsedUrl.hostname,
             path: parsedUrl.pathname,
-            port: parsedUrl.port,
-            headers: {
-                ...vapidHeaders,
-                'TTL': '60',
-                'Content-Encoding': 'aes128gcm',
-                'Content-Type': 'application/octet-stream',
-                'Content-Length': encrypted.length
-            },
+            port: 443,
+            headers: { ...vapidHeaders, 'TTL': '60', 'Content-Encoding': 'aes128gcm', 'Content-Type': 'application/octet-stream', 'Content-Length': encrypted.length },
         };
 
-        console.log(parsedUrl);
-	console.log(options);
-	
         return new Promise<void>((resolve, reject) => {
-            const req = https.request(options, (res) => {
+            const req = https.request(options, (res: MyIncomingMessage) => {
+            let body = ''; 
+
+            console.log('Headers:', res.headers);
+
+            res.on('data', chunk => { body += chunk; });
+
+            res.on('end', () => {
+              console.log('Body:', body);
+	      console.log(res.statusCode);
+
               if (res.statusCode! >= 200 && res.statusCode! < 300) {
                 resolve();
               } else {
-                    reject(new Error(`Failed to send push notification. Status code: ${res.statusCode}`));
+                reject(new Error(`Failed to send push notification. Status code: ${res.statusCode}, Body: ${body}`));
               }
             });
+          });
 
           req.on('error', (error) => {
             reject(new Error(`Failed to send push notification. Error: ${error.message}`));

src/vapidService.ts

@@ -59,9 +59,23 @@ class VapidService {
   }
 
 
+  private isP256Key(publicKeyBuffer) {
+    if (publicKeyBuffer.length === 65 && publicKeyBuffer[0] === 0x04) {
+      return true;
+    }
+
+    if (publicKeyBuffer.length === 33 && (publicKeyBuffer[0] === 0x02 || publicKeyBuffer[0] === 0x03)) {
+      return true;
+    }
+    return false;
+  }
+
+
   async createVapidAuthHeader(endpoint: string, expiration: number, subject: string, appKeys: VapidKeys): Promise<{ 'Authorization': string, 'Crypto-Key': string }> {
     const { publicKey, privateKey } = appKeys;
 
+    console.log(publicKey);
+    
     const jwtInfo = {
       aud: new URL(endpoint).origin,
       exp: Math.floor((Date.now() / 1000) + expiration),
@@ -72,14 +86,58 @@ class VapidService {
     const privateKeyBuffer = Buffer.from(privateKey, 'base64');
     ecdh.setPrivateKey(privateKeyBuffer);
 
-    const pems = ecKeyUtils.generatePem({curveName, privateKey: ecdh.getPrivateKey(), publicKey: ecdh.getPublicKey() });
+    const rawPublicKeyBuffer = ecdh.getPublicKey();
+    const asn1Header = Buffer.from('3059301306072a8648ce3d020106082a8648ce3d030107034200', 'hex');
+    const derPublicKeyBuffer = Buffer.concat([asn1Header, rawPublicKeyBuffer]);
+    const base64DerPublicKey = derPublicKeyBuffer.toString('base64');
+
+    console.log("base64DerPublicKey: ", base64DerPublicKey)
+
+    const pems = ecKeyUtils.generatePem({curveName, privateKey: ecdh.getPrivateKey(), publicKey: rawPublicKeyBuffer });
+
+    console.log("privateKey: ", pems.privateKey);
+    console.log();
+    console.log("publicKey: ", pems.publicKey);
+
+    const ders = ecKeyUtils.generateDer({curveName, privateKey: ecdh.getPrivateKey(), publicKey: rawPublicKeyBuffer });
+    console.log("privateKey: ", ders.privateKey);
+    console.log("publicKey: ", ders.publicKey);
     
     const jwtToken = jwt.sign(jwtInfo, pems.privateKey, { algorithm: 'ES256' });
 
-    return {
+    try {
+      const decoded = Buffer.from(base64DerPublicKey, 'base64').toString('utf-8');
+      console.log('Valid Base64 Encoded:', decoded);
+
+      console.log('isP256Key:', this.isP256Key(Buffer.from(base64DerPublicKey, 'base64')) );
+      
+    } catch (error) {
+      console.log('Invalid Base64 Encoding');
+      
+    }
+
+    try {
+      const decodedKey = Buffer.from(base64DerPublicKey, 'base64');
+      console.log('Decoded Key Length:', decodedKey.length);
+      if (decodedKey.length !== 65) {
+        console.log('Invalid Key Length');
+	
+      } else {
+        console.log('Key Length is Valid');
+	
+      }
+      
+    } catch (err) {
+     console.log('Invalid Base64-URL Encoding');
+     
+    }
+
+    const result = {
       'Authorization': `vapid t=${jwtToken}, k=${publicKey}`,
-      'Crypto-Key': publicKey
+      'Crypto-Key': "p256ecdsa="+ders.publicKey.toString('base64')
     };
+    console.log(result);
+    return result;
   }
 }