src/snek/static/push.js

@@ -31,9 +31,6 @@ export const registerServiceWorker = async () => {
                         /* other app-specific data, such as user identity */
                     };
                     console.log(pushSubscription.endpoint, pushSubscription, pushSubscription.toJSON(), subscriptionObject);
-                    // The push subscription details needed by the application
-                    // server are now available, and can be sent to it using,
-                    // for example, the fetch() API.
 
                     fetch('/push.json', {
                         method: 'POST',

src/snek/static/service-worker.js

@@ -33,16 +33,18 @@ async function subscribeUser() {
 
 
 self.addEventListener("push",  (event) => {
-  if (!(self.Notification && self.Notification.permission === "granted")) {
+  if (!self.Notification || self.Notification.permission !== "granted") {
+    console.log("Notification permission not granted");
     return;
   }
-  console.log("Received a push message", event);
 
   const data = event.data?.json() ?? {};
+  console.log("Received a push message", event, data);
+
   const title = data.title || "Something Has Happened";
   const message =
     data.message || "Here's something you might want to check out.";
-  const icon = "images/new-notification.png";
+  const icon = data.icon || "images/new-notification.png";
   console.log("showing message", title, message, icon);
 
   const reg = self.registration.showNotification(title, {

src/snek/system/notification.py

@@ -10,10 +10,14 @@ from cryptography.hazmat.backends import default_backend
 from urllib.parse import urlparse
 import os.path
 
+from cryptography.hazmat.primitives.ciphers.aead import AESGCM
+from cryptography.hazmat.primitives.hashes import SHA256
+from cryptography.hazmat.primitives.kdf.hkdf import HKDF
+
+PRIVATE_KEY_FILE = "./notification-private.pem"
+PRIVATE_KEY_PKCS8_FILE = "./notification-private.pkcs8.pem"
+PUBLIC_KEY_FILE = "./notification-public.pem"
 
-PRIVATE_KEY_FILE = './notification-private.pem'
-PRIVATE_KEY_PKCS8_FILE = './notification-private.pkcs8.pem'
-PUBLIC_KEY_FILE = './notification-public.pem'
 
 def generate_private_key():
     if not os.path.isfile(PRIVATE_KEY_FILE):
@@ -23,34 +27,40 @@ def generate_private_key():
         pem = private_key.private_bytes(
             encoding=serialization.Encoding.PEM,
             format=serialization.PrivateFormat.TraditionalOpenSSL,
-            encryption_algorithm=serialization.NoEncryption()
+            encryption_algorithm=serialization.NoEncryption(),
         )
 
         # Write the private key to a file
-        with open(PRIVATE_KEY_FILE, 'wb') as pem_out:
+        with open(PRIVATE_KEY_FILE, "wb") as pem_out:
             pem_out.write(pem)
 
+
 def generate_pcks8_private_key():
     # openssl pkcs8 -topk8 -nocrypt -in private.pem -out private.pkcs8.pem
     if not os.path.isfile(PRIVATE_KEY_PKCS8_FILE):
-        with open(PRIVATE_KEY_FILE, 'rb') as pem_in:
-            private_key = serialization.load_pem_private_key(pem_in.read(), password=None, backend=default_backend())
+        with open(PRIVATE_KEY_FILE, "rb") as pem_in:
+            private_key = serialization.load_pem_private_key(
+                pem_in.read(), password=None, backend=default_backend()
+            )
 
         # Serialize the private key to PKCS8 format
         pem = private_key.private_bytes(
             encoding=serialization.Encoding.PEM,
             format=serialization.PrivateFormat.PKCS8,
-            encryption_algorithm=serialization.NoEncryption()
+            encryption_algorithm=serialization.NoEncryption(),
         )
 
         # Write the private key to a file
-        with open(PRIVATE_KEY_PKCS8_FILE, 'wb') as pem_out:
+        with open(PRIVATE_KEY_PKCS8_FILE, "wb") as pem_out:
             pem_out.write(pem)
 
+
 def generate_public_key():
     if not os.path.isfile(PUBLIC_KEY_FILE):
-        with open(PRIVATE_KEY_FILE, 'rb') as pem_in:
-            private_key = serialization.load_pem_private_key(pem_in.read(), password=None, backend=default_backend())
+        with open(PRIVATE_KEY_FILE, "rb") as pem_in:
+            private_key = serialization.load_pem_private_key(
+                pem_in.read(), password=None, backend=default_backend()
+            )
 
         # Get the public key from the private key
         public_key = private_key.public_key()
@@ -58,18 +68,30 @@ def generate_public_key():
         # Serialize the public key to PEM format
         pem = public_key.public_bytes(
             encoding=serialization.Encoding.PEM,
-            format=serialization.PublicFormat.SubjectPublicKeyInfo
+            format=serialization.PublicFormat.SubjectPublicKeyInfo,
         )
 
         # Write the public key to a file
-        with open(PUBLIC_KEY_FILE, 'wb') as pem_out:
+        with open(PUBLIC_KEY_FILE, "wb") as pem_out:
             pem_out.write(pem)
 
+
 def ensure_certificates():
     generate_private_key()
     generate_pcks8_private_key()
     generate_public_key()
 
+
+def hkdf(input_key, salt, info, length):
+    return HKDF(
+        algorithm=SHA256(),
+        length=length,
+        salt=salt,
+        info=info,
+        backend=default_backend(),
+    ).derive(input_key)
+
+
 class Notifications:
     private_key_pem = None
     public_key = None
@@ -77,30 +99,35 @@ class Notifications:
 
     def __init__(self):
         ensure_certificates()
-        with open(PRIVATE_KEY_FILE, 'rb') as pem_in:
-            private_key = serialization.load_pem_private_key(pem_in.read(), password=None, backend=default_backend())
+        with open(PRIVATE_KEY_FILE, "rb") as pem_in:
+            private_key = serialization.load_pem_private_key(
+                pem_in.read(), password=None, backend=default_backend()
+            )
             self.private_key_pem = private_key.private_bytes(
                 encoding=serialization.Encoding.PEM,
                 format=serialization.PrivateFormat.TraditionalOpenSSL,
-                encryption_algorithm=serialization.NoEncryption()
+                encryption_algorithm=serialization.NoEncryption(),
             )
 
-        with open(PUBLIC_KEY_FILE, 'rb') as pem_in:
-            self.public_key = serialization.load_pem_public_key(pem_in.read(), backend=default_backend())
+        with open(PUBLIC_KEY_FILE, "rb") as pem_in:
+            self.public_key = serialization.load_pem_public_key(
+                pem_in.read(), backend=default_backend()
+            )
             public_numbers = self.public_key.public_numbers()
 
             self.public_key_jwk = {
                 "kty": "EC",
                 "crv": "P-256",
-                "x": base64.urlsafe_b64encode(public_numbers.x.to_bytes(32, byteorder='big')).decode('utf-8'),
-                "y": base64.urlsafe_b64encode(public_numbers.y.to_bytes(32, byteorder='big')).decode('utf-8')
+                "x": base64.urlsafe_b64encode(
+                    public_numbers.x.to_bytes(32, byteorder="big")
+                ).decode("utf-8"),
+                "y": base64.urlsafe_b64encode(
+                    public_numbers.y.to_bytes(32, byteorder="big")
+                ).decode("utf-8"),
             }
 
         print(f"Public key JWK: {self.public_key_jwk}")
 
-
-
-
     def create_notification_authorization(self, push_url):
         target = urlparse(push_url)
         aud = f"{target.scheme}://{target.netloc}"
@@ -108,17 +135,91 @@ class Notifications:
 
         identifier = str(uuid.uuid4())
 
-        print(f"Creating notification authorization for {aud} with identifier {identifier}")
+        print(
+            f"Creating notification authorization for {aud} with identifier {identifier}"
+        )
 
-        return jwt.encode({
+        return jwt.encode(
+            {
                 "sub": sub,
                 "aud": aud,
                 "exp": int(time.time()) + 60 * 60,
                 "nbf": int(time.time()),
                 "iat": int(time.time()),
                 "jti": identifier,
-        }, self.private_key_pem, algorithm='ES256')
+            },
+            self.private_key_pem,
+            algorithm="ES256",
+        )
 
+    def create_encrypted_payload(self, auth: str, p256dh:str, payload:str):
+        # 1. Generate private key
+        private_key = ec.generate_private_key(ec.SECP256R1(), default_backend())
+
+        # 2. Get public key
+        public_key = private_key.public_key()
+
+        salt = os.urandom(16)
+
+        subscription_pub_key_bytes = base64.urlsafe_b64decode(p256dh+ '==')
+        subscription_public_key = ec.EllipticCurvePublicKey.from_encoded_point(
+            ec.SECP256R1(), subscription_pub_key_bytes
+        )
+        shared_secret = private_key.exchange(ec.ECDH(), subscription_public_key)
+
+        auth_dec = base64.b64decode(auth+ '==')
+        auth_enc = b"Content-Encoding: auth\x00"
+        prk = hkdf(shared_secret, auth_dec, auth_enc, 32)
+
+        # 5. Build context
+        key_label = b"P-256\x00"
+        subscription_len = len(subscription_pub_key_bytes).to_bytes(2, "big")
+        local_pub_bytes = public_key.public_bytes(
+            encoding=serialization.Encoding.X962, format=serialization.PublicFormat.UncompressedPoint
+        )
+        local_len = len(local_pub_bytes).to_bytes(2, "big")
+        context = (
+            key_label
+            + subscription_len
+            + subscription_pub_key_bytes
+            + local_len
+            + local_pub_bytes
+        )
+
+        # 6. Generate nonce and CEK
+        nonce_enc = b"Content-Encoding: nonce\x00"
+        nonce_info = nonce_enc + context
+        cek_enc = b"Content-Encoding: aesgcm\x00"
+        cek_info = cek_enc + context
+
+        nonce = hkdf(prk, salt, nonce_info, 12)
+        content_encryption_key = hkdf(prk, salt, cek_info, 16)
+
+        # 7. Encrypt payload with AES-GCM
+        aesgcm = AESGCM(content_encryption_key)
+        padding_length = 0  # adjust if needed
+        padding = padding_length.to_bytes(2, "big") + b"\x00" * padding_length
+        combined = padding + payload.encode("utf-8")
+        encrypted = aesgcm.encrypt(nonce, combined, None)
+
+        return {
+            'payload': encrypted,
+            'salt': salt,
+            'public_key': local_pub_bytes
+        }
+
+    @property
+    def public_key_base64(self):
+        return (
+            base64.urlsafe_b64encode(
+                self.public_key.public_bytes(
+                    encoding=serialization.Encoding.X962,
+                    format=serialization.PublicFormat.UncompressedPoint,
+                )
+            )
+            .decode("utf-8")
+            .rstrip("=")
+        )
 
 @cache
 def get_notifications():

src/snek/view/push.py

@@ -25,6 +25,7 @@
 
 
 import base64
+import json
 
 import requests
 from cryptography.hazmat.primitives import serialization
@@ -35,19 +36,22 @@ from snek.system.view import BaseFormView
 
 class PushView(BaseFormView):
     async def get(self):
-        notifications =get_notifications()
+        notifications = get_notifications()
 
-        return await self.json_response({
+        return await self.json_response(
+            {
                 "publicKey": base64.b64encode(
                     notifications.public_key.public_bytes(
                         encoding=serialization.Encoding.X962,
-                    format=serialization.PublicFormat.UncompressedPoint
+                        format=serialization.PublicFormat.UncompressedPoint,
+                    )
+                )
+                .decode("utf-8")
+                .rstrip("="),
+            }
         )
-            ).decode('utf-8').rstrip("="),
-        })
 
     async def post(self):
-
         memberships = []
         user = {}
 
@@ -59,34 +63,57 @@ class PushView(BaseFormView):
 
             body = await self.request.json()
 
-            if not ("encoding" in body and "endpoint" in body and "keys" in body and "p256dh" in body["keys"] and "auth"  in body["keys"]):
-                return await self.json_response({"error": "Invalid request"}, status=400)
+            if not (
+                "encoding" in body
+                and "endpoint" in body
+                and "keys" in body
+                and "p256dh" in body["keys"]
+                and "auth" in body["keys"]
+            ):
+                return await self.json_response(
+                    {"error": "Invalid request"}, status=400
+                )
 
             print(body)
-            notifications =get_notifications()
+            notifications = get_notifications()
 
-            cert = base64.urlsafe_b64encode(
-                notifications.public_key.public_bytes(
-                    encoding=serialization.Encoding.X962,
-                    format=serialization.PublicFormat.UncompressedPoint
+            cert = notifications.public_key_base64
+
+            test_payload = {
+                "title": "Hey retoor",
+                "message": "Guess what? ;P",
+                "icon": "https://molodetz.online/image/snek192.png",
+                "url": "https://localhost:8081",
+            }
+
+            encryped = notifications.create_encrypted_payload(
+                body["keys"]["auth"],
+                body["keys"]["p256dh"],
+                json.dumps(test_payload),
             )
-            ).decode('utf-8').rstrip("=")
+
+            payload = encryped["payload"]
+            salt = encryped["salt"]
+            public_key = encryped["public_key"]
 
             headers = {
                 "TTL": "60",
                 "Authorization": f"WebPush {notifications.create_notification_authorization(body['endpoint'])}",
-                    "Crypto-Key": f"p256ecdsa={cert}",
+                "Crypto-Key": f"dh={base64.urlsafe_b64encode(public_key).decode('utf-8').rstrip('=')}; p256ecdsa={cert}",
+                "Encryption": f"salt={base64.urlsafe_b64encode(salt).decode('utf-8').rstrip('=')}",
+
+                "Content-Encoding": "aesgcm",
+                "Content-Length": str(len(payload)),
+                "Content-Type": "application/octet-stream",
             }
 
             print(headers)
 
-            post_notification = requests.post(
-                body["endpoint"],
-                headers=headers)
+            post_notification = requests.post(body["endpoint"], headers=headers, data=payload)
 
             print(post_notification.status_code)
             print(post_notification.text)
-
+            print(post_notification.headers)
 
             async for model in self.app.services.channel_member.find(
                 user_uid=user_id, deleted_at=None, is_banned=False