fix notebook helpers

rwth_nb/misc/notebook.py

 import os
 import requests
 from IPython.lib import kernel
-from notebook import notebookapp
 
-def get_contents():
-    servers = list(notebookapp.list_running_servers())
+base_url = 'https://jupyter.rwth-aachen.de'
+hub_api_url = f'{base_url}/hub/api'
 
-    token = servers[0]['token']
-    api_url = servers[0]['url'] + 'api'
+def get_current_path():
+    token = os.environ['JUPYTERHUB_API_TOKEN']
+    user = os.environ['JUPYTERHUB_USER']
 
     connection_file_path = kernel.get_connection_file()
     connection_file = os.path.basename(connection_file_path)
     kernel_id = connection_file.split('-', 1)[1].split('.')[0]
 
-    headers = {
-        'Authorization': f'token {token}'
-    }
-
-    r = requests.request('GET', f'{api_url}/sessions', headers=headers)
+    r = requests.request('GET', f'{base_url}/user/{user}/api/sessions', headers={
+        'Authorization': f'Bearer {token}'
+    })
+    r.raise_for_status()
      
     for session in r.json():
         if session['kernel']['id'] == kernel_id:
-            path = session['notebook']['path']
+            return session['notebook']['path']
+
+def get_contents(path=None, user=None, token=None):
+    if path is None:
+        path = get_current_path()
+
+    if user is None:
+        user = os.environ['JUPYTERHUB_USER']
+    
+    if token is None:
+        token = os.environ['JUPYTERHUB_API_TOKEN']
 
-    r = requests.request('GET', f'{api_url}/contents/{path}', headers=headers)
+    r = requests.request('GET', f'{base_url}/user/{user}/api/contents/{path}', headers={
+        'Authorization': 'Bearer ' + token
+    })
+    r.raise_for_status()
 
     return r.json()

tests/notebook.py

+
+import rwth_nb.misc.notebook as nb
+
+from pprint import pprint
+
+# Works only inside a notebook!
+path = get_current_path()
+
+content = get_contents(path)
+
+pprint(content)