Adds anonymous users (#863)

* Adds anonymous users

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* removes unused import

* Removes random colors

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Zachary Sailer <zsailer@apple.com>

jupyter_server/auth/identity.py

@@ -9,6 +9,7 @@
 
 import binascii
 import datetime
+import json
 import os
 import re
 import sys
@@ -24,6 +25,7 @@
 from jupyter_server.transutils import _i18n
 
 from .security import passwd_check, set_password
+from .utils import get_anonymous_username
 
 # circular imports for type checking
 if TYPE_CHECKING:
@@ -290,11 +292,28 @@ def user_to_cookie(self, user: User) -> str:
         Default is just the user's username.
         """
         # default: username is enough
-        return user.username
+        cookie = json.dumps(
+            {
+                "username": user.username,
+                "name": user.name,
+                "display_name": user.display_name,
+                "initials": user.initials,
+                "color": user.color,
+            }
+        )
+        return cookie
 
     def user_from_cookie(self, cookie_value: str) -> User | None:
         """Inverse of user_to_cookie"""
-        return User(username=cookie_value)
+        user = json.loads(cookie_value)
+        return User(
+            user["username"],
+            user["name"],
+            user["display_name"],
+            user["initials"],
+            None,
+            user["color"],
+        )
 
     def get_cookie_name(self, handler: JupyterHandler) -> str:
         """Return the login cookie name
@@ -396,7 +415,6 @@ def get_token(self, handler: JupyterHandler) -> str | None:
         - in URL parameters: ?token=<token>
         - in header: Authorization: token <token>
         """
-
         user_token = handler.get_argument("token", "")
         if not user_token:
             # get it from Authorization header
@@ -447,8 +465,12 @@ def generate_anonymous_user(self, handler: JupyterHandler) -> User:
         but does not identify a user.
         """
         user_id = uuid.uuid4().hex
+        moon = get_anonymous_username()
+        name = display_name = f"Anonymous {moon}"
+        initials = f"A{moon[0]}"
+        color = None
         handler.log.info(f"Generating new user for token-authenticated request: {user_id}")
-        return User(user_id)
+        return User(user_id, name, display_name, initials, None, color)
 
     def should_check_origin(self, handler: JupyterHandler) -> bool:
         """Should the Handler check for CORS origin validation?

jupyter_server/auth/utils.py

@@ -3,6 +3,7 @@
 # Copyright (c) Jupyter Development Team.
 # Distributed under the terms of the Modified BSD License.
 import importlib
+import random
 import re
 import warnings
 
@@ -74,3 +75,95 @@ def match_url_to_resource(url, regex_mapping=None):
         pattern = re.compile(regex)
         if pattern.fullmatch(url):
             return auth_resource
+
+
+# From https://en.wikipedia.org/wiki/Moons_of_Jupiter
+moons_of_jupyter = [
+    "Metis",
+    "Adrastea",
+    "Amalthea",
+    "Thebe",
+    "Io",
+    "Europa",
+    "Ganymede",
+    "Callisto",
+    "Themisto",
+    "Leda",
+    "Ersa",
+    "Pandia",
+    "Himalia",
+    "Lysithea",
+    "Elara",
+    "Dia",
+    "Carpo",
+    "Valetudo",
+    "Euporie",
+    "Eupheme",
+    # 'S/2003 J 18',
+    # 'S/2010 J 2',
+    "Helike",
+    # 'S/2003 J 16',
+    # 'S/2003 J 2',
+    "Euanthe",
+    # 'S/2017 J 7',
+    "Hermippe",
+    "Praxidike",
+    "Thyone",
+    "Thelxinoe",
+    # 'S/2017 J 3',
+    "Ananke",
+    "Mneme",
+    # 'S/2016 J 1',
+    "Orthosie",
+    "Harpalyke",
+    "Iocaste",
+    # 'S/2017 J 9',
+    # 'S/2003 J 12',
+    # 'S/2003 J 4',
+    "Erinome",
+    "Aitne",
+    "Herse",
+    "Taygete",
+    # 'S/2017 J 2',
+    # 'S/2017 J 6',
+    "Eukelade",
+    "Carme",
+    # 'S/2003 J 19',
+    "Isonoe",
+    # 'S/2003 J 10',
+    "Autonoe",
+    "Philophrosyne",
+    "Cyllene",
+    "Pasithee",
+    # 'S/2010 J 1',
+    "Pasiphae",
+    "Sponde",
+    # 'S/2017 J 8',
+    "Eurydome",
+    # 'S/2017 J 5',
+    "Kalyke",
+    "Hegemone",
+    "Kale",
+    "Kallichore",
+    # 'S/2011 J 1',
+    # 'S/2017 J 1',
+    "Chaldene",
+    "Arche",
+    "Eirene",
+    "Kore",
+    # 'S/2011 J 2',
+    # 'S/2003 J 9',
+    "Megaclite",
+    "Aoede",
+    # 'S/2003 J 23',
+    "Callirrhoe",
+    "Sinope",
+]
+
+
+def get_anonymous_username() -> str:
+    """
+    Get a random user-name based on the moons of Jupyter.
+    This function returns names like "Anonymous Io" or "Anonymous Metis".
+    """
+    return moons_of_jupyter[random.randint(0, len(moons_of_jupyter) - 1)]