lookup_plugins/bitwarden: ignore stderr

Otherwise we get weird JSON parsing errors:
```
An unhandled exception occurred while running the lookup plugin 'bitwarden'.
Error was a <class 'json.decoder.JSONDecodeError'>, original message:
Extra data: line 1 column 843 (char 842). Extra data: line 1 column 843 (char 842)
```

Signed-off-by: Jakub Sokołowski <jakub@status.im>

ansible/lookup_plugins/bitwarden.py

@@ -7,9 +7,11 @@
 # This plugin can be run directly by specifying the field followed by a list of
 # entries, e.g.  bitwarden.py password google.com wufoo.com
 #
-# This version includes fixes that can be found in this fork:
-# https://github.com/status-im/ansible-modules-bitwarden
-#
+# CHANGES:
+# - Dropped custom_field argument
+# - Started checking sources in order
+# - Refactored Bitwarden class, added get_item()
+# - Split LookupModule.run into two functions
 from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type
 
@@ -17,7 +19,6 @@ import json
 import os
 import sys
 
-from shutil import which
 from subprocess import Popen, PIPE, STDOUT, check_output
 
 from ansible.errors import AnsibleError
@@ -69,7 +70,9 @@ class Bitwarden(object):
     def __init__(self, path):
         self._cli_path = path
         self._bw_session = ""
-        if which("bw") is None:
+        try:
+            check_output([self._cli_path, "--version"])
+        except OSError:
             raise AnsibleError("Command not found: {0}".format(self._cli_path))
 
     @property
@@ -84,12 +87,20 @@ class Bitwarden(object):
     def cli_path(self):
         return self._cli_path
 
+    @property
+    def logged_in(self):
+        # Parse Bitwarden status to check if logged in
+        if self.status() == 'unlocked':
+            return True
+        else:
+            return False
+
     def _run(self, args):
         my_env = os.environ.copy()
         if self.session != "":
             my_env["BW_SESSION"] = self.session
         p = Popen([self.cli_path] + args, stdin=PIPE,
-                  stdout=PIPE, stderr=STDOUT, env=my_env)
+                  stdout=PIPE, stderr=PIPE, env=my_env)
         out, _ = p.communicate()
         out = out.decode()
         rc = p.wait()
@@ -118,6 +129,13 @@ class Bitwarden(object):
     def sync(self):
         self._run(['sync'])
 
+    def status(self):
+        try:
+            data = json.loads(self._run(['status']))
+        except json.decoder.JSONDecodeError as e:
+            raise AnsibleError("Error decoding Bitwarden status: %s" % e)
+        return data['status']
+
     def get_entry(self, key, field):
         return self._run(["get", field, key])
 
@@ -149,12 +167,18 @@ class LookupModule(LookupBase):
     def run(self, terms, variables=None, **kwargs):
         self.bw = Bitwarden(path=kwargs.get('path', 'bw'))
 
+        if not self.bw.logged_in:
+            raise AnsibleError("Not logged into Bitwarden: please run "
+                               "'bw login', or 'bw unlock' and set the "
+                               "BW_SESSION environment variable first")
+
+        values = []
+
         if kwargs.get('sync'):
             self.bw.sync()
         if kwargs.get('session'):
             self.bw.session = kwargs.get('session')
 
-        values = []
         for term in terms:
             rval = self.lookup(term, kwargs)
             if rval is None:
@@ -191,7 +215,7 @@ def main():
         print("Usage: %s <field> <name> [name name ...]" % os.path.basename(__file__))
         return -1
 
-    print(LookupModule().run(sys.argv[2:], variables=None, field=sys.argv[1]))
+    print(LookupModule().run(sys.argv[2:], variables=None, field=sys.argv[1], file='origin.crt'))
 
     return 0