[feat] load credentials from environment variable

Look for file defined in the `BITMASK_CREDENTIALS` env variable and load
`provider`, `username` and `password` data.
Trigger login if they were loaded correctly.

The credentials file should look like this:

[Credentials]
username = my-account@my-provider.com
password = secret

- Resolves: #7419

2 files changed, 37 insertions, 0 deletions

diff --git a/changes/feature-7419_load-credentials-from-env b/changes/feature-7419_load-credentials-from-env
new file mode 100644
index 00000000..7704df01
--- /dev/null
+++ b/changes/feature-7419_load-credentials-from-env
@@ -0,0 +1 @@
+- Load credentials from environment variables and trigger login. Closes feature #7419.
diff --git a/src/leap/bitmask/gui/mainwindow.py b/src/leap/bitmask/gui/mainwindow.py
index 312048ba..b0f14aef 100644
--- a/src/leap/bitmask/gui/mainwindow.py
+++ b/src/leap/bitmask/gui/mainwindow.py
@@ -17,8 +17,11 @@
 """
 Main window for Bitmask.
 """
+import os
 import time
 
+import ConfigParser
+
 from datetime import datetime
 
 import psutil
@@ -781,6 +784,10 @@ class MainWindow(QtGui.QMainWindow, SignalTracker):
         if self._wizard:
             self._load_from_wizard()
         else:
+            if self._load_credentials_from_env():
+                self._login()
+                return
+
             domain = self._settings.get_provider()
             if domain is not None:
                 self._providers.select_provider_by_name(domain)
@@ -796,6 +803,35 @@ class MainWindow(QtGui.QMainWindow, SignalTracker):
                 if self._login_widget.load_user_from_keyring(saved_user):
                     self._login()
 
+    def _load_credentials_from_env(self):
+        """
+        Load username and password into the login widget from a file specified
+        in an environment variable. This is useful for test purposes.
+
+        :return: True if credentials were loaded, False otherwise
+        :rtype: bool
+        """
+        credentials = os.environ.get("BITMASK_CREDENTIALS")
+
+        if credentials is None:
+            return False
+
+        try:
+            config = ConfigParser.ConfigParser()
+            config.read(credentials)
+            username, domain = config.get('Credentials', 'username').split('@')
+            password = config.get('Credentials', 'password')
+        except Exception, e:
+            print "Error reading credentials file: {0}".format(e)
+            return False
+
+        self._providers.select_provider_by_name(domain)
+        self._login_widget.set_provider(domain)
+        self._login_widget.set_user(username)
+        self._login_widget.set_password(password)
+
+        return True
+
     def _show_hide_unsupported_services(self):
         """
         Given a set of configured providers, it creates a set of