Admin sends a messagae on account creation

server/app/views.py

@@ -7,16 +7,32 @@ import sys
 sys.path.insert(0, "..")
 from encryption import PrivateKey, PublicKey
 
+def get_or_create_admin():
+    if not User.objects.filter(name='subrosa_admin').exists():
+        private_key = PrivateKey.generate()
+        public_key = private_key.get_public_key()
+        admin = User(name='subrosa_admin', public_key=str(public_key))
+        admin.save()
+    return User.objects.get(name='subrosa_admin')
+
 @route_post("users/new", args={'name': str, 'public_key': str})
 def create_user(params):
     "Creates a new user"
+    admin = get_or_create_admin()
     try:
-        PublicKey.load(params['public_key'])
+        public_key = PublicKey.load(params['public_key'])
     except (ValueError, FileNotFoundError):
         raise NotAllowed("Invalid public key")
     try:
         new_user = User.from_dict(params)
         new_user.save()
+        welcome = "Welcome to SubRosa! Please be a good community member."
+        message = Message(
+            sender=admin, 
+            recipient=new_user,
+            ciphertext=public_key.encrypt(welcome)
+        )
+        message.save()
         return new_user.to_dict()
     except:
         raise NotAllowed(f"Username {params['name']} is already in use.")