def authenticate_user(self, name, password):
"""Return the tuple of the user name, description, and blob if the user
was successfully authenticated."""
users = self._readonly_copy()
try:
description, blob, pword = users[name]
except KeyError:
raise UserStorageError("The name or password is invalid.")
if password != pword:
raise UserStorageError("The name or password is invalid.")
return name, description, blob
def _readonly_copy(self):
"""Return the user database (which should not be modified)."""
try:
self._db.lock()
try:
data = self._db.read()
finally:
self._db.unlock()
except PersistentError, e:
raise UserStorageError(str(e))
def add_user(self, name, description, password):
"""Add a new user."""
self._db.lock()
try:
users = self._db.read()
if users.has_key(name):
raise UserStorageError("The user \"%s\" already exists." % name)
users[name] = (description, {}, password)
self._db.write(users)
finally:
self._db.unlock()
def delete_user(self, name):
"""Delete a user."""
self._db.lock()
try:
users = self._db.read()
try:
del users[name]
except KeyError:
raise UserStorageError("The user \"%s\" does not exist." % name)
self._db.write(users)
finally:
self._db.unlock()
def update_password(self, name, password):
"""Update the password for the given user."""
self._db.lock()
try:
users = self._db.read()
try:
description, blob, _ = users[name]
except KeyError:
raise UserStorageError("The user \"%s\" does not exist." % name)
users[name] = (description, blob, password)
self._db.write(users)
finally:
self._db.unlock()