change {username}{servername} to {userid} to avoid volume length rest…

…rictions of 63 characters (kubeflow#1200)

* shorten pvc, pod names

* change {username}{servername} to {userid} to avoid volume length restrictions

* remove extraneous changes

* avoid identifier length limitations for pvc and pod by removing prefix accounts.google: for iap and truncating escaped self.user.name to 63 characters

* add comment about overriding KubeSpawner method

* fix _parse_user_name error

* add TODO unit test for _parse_user_name

kubeflow/core/kubeform_spawner.py

@@ -1,5 +1,7 @@
 import json
 import os
+import string
+import escapism
 from kubespawner.spawner import KubeSpawner
 from jhub_remote_user_authenticator.remote_user_auth import RemoteUserAuthenticator
 from oauthenticator.github import GitHubOAuthenticator
@@ -111,6 +113,34 @@ def get_env(self):
             env['GOOGLE_APPLICATION_CREDENTIALS'] = '{}/{}.json'.format(SERVICE_ACCOUNT_SECRET_MOUNT, gcp_secret_name)
         return env
 
+    # TODO(kkasravi): add unit test
+    def _parse_user_name(self, username): 
+        safe_chars = set(string.ascii_lowercase + string.digits)
+        name = username.split(':')[-1]
+        legacy = ''.join([s if s in safe_chars else '-' for s in name.lower()])
+        safe = escapism.escape(name, safe=safe_chars, escape_char='-').lower()
+        return legacy, safe, name
+
+    def _expand_user_properties(self, template):
+        # override KubeSpawner method to remove prefix accounts.google: for iap
+        # and truncate to 63 characters 
+
+        # Set servername based on whether named-server initialised
+        if self.name:
+            servername = '-{}'.format(self.name)
+        else:
+            servername = ''
+
+        legacy, safe, name = self._parse_user_name(self.user.name)
+        rname = template.format(
+            userid=self.user.id,
+            username=safe,
+            unescaped_username=name,
+            legacy_escape_username=legacy,
+            servername=servername
+            )[:63]
+        return rname
+
 
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