def new_message_request(data):
"""Verifies that the given dict represents a valid message."""
success = True
errors = []
dkeys = data.keys()
req_keys = ['receiver_id', 'sender_id', 'receiver_key_id', 'sender_key_id',
'message', 'signature']
# First thing is to ensure that the keys in the given data dict match the
# expected keys exactly.
if set(dkeys) != set(req_keys):
success = False
errors.append({
'type': 'FATAL',
'cause':
"Keys in request (%s) do not match required keys (%s)." % \
(str(dkeys), str(req_keys))})
else:
# Helper function to verify subset of keys are uuids.
success = merge_errors(success, errors, keys_are_uuids(data,
req_keys[:4]))
if success:
# All uuid fields are valid.
for k in req_keys[:2]:
if not model.user_exists(data[k]):
success = False
errors.append({
'type': 'FATAL',
'cause': "The user (%s) does not exist." % data[k]})
if success:
# All users are valid
for k in req_keys[2:4]:
# Check that given keys exist
user_key_id = data[k]
key = model.get_key(user_key_id)
if not key:
success = False
errors.append({
'type': 'FATAL',
'cause': "Invalid key_id (%s)." % (user_key_id)})
elif key['user_id'] != data[k[:-6] + 'id']:
success = False
errors.append({
'type': 'FATAL',
'cause': ("Key's user_id ({0}) does not match " \
"given user_id ({1}).").format(key['user_id'],
data[k[:-6] + 'id'])})
if success:
if not science.verify_message(data['message'],
data['signature'],
model.get_key(
data['sender_key_id'])['key']):
success = False
errors.append({
'type': 'FATAL',
'cause': ("Given key ({0}) could not verify " \
"signature.").format(key['key'])})
return (success, errors)
def get_key(key_id):
"""Get's the key with the given key_id."""
try:
key = model.get_key(UUID(key_id))
except ValueError:
key = model.get_key(key_id)
if key != None:
del key['_id']
if key:
result = {
'success': True,
'key': key}
else:
result = {
'success': False,
'errors': [{
'type': 'FATAL',
'cause': 'Could not find a key with the given id (%s).' %
(key_id)}],
'key': None}
return result