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Merge pull request #550 from matrix-org/daniel/guestnames

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Allocate guest user IDs numericcally

The current random IDs are ugly and confusing when presented in UIs.
This makes them prettier and easier to read.

Also, disable non-automated registration of numeric IDs so that we don't
need to worry so much about people carving out our automated address
space and us needing to keep retrying ID registration.
This commit is contained in:
Daniel Wagner-Hall 2016-02-05 11:22:42 +00:00
commit 8f1031586f
2 changed files with 72 additions and 19 deletions
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55
synapse/handlers/register.py
View file

@ -21,7 +21,6 @@ from synapse.api.errors import (
AuthError, Codes, SynapseError, RegistrationError, InvalidCaptchaError
)
from ._base import BaseHandler
import synapse.util.stringutils as stringutils
from synapse.util.async import run_on_reactor
from synapse.http.client import CaptchaServerHttpClient
@ -45,6 +44,8 @@ class RegistrationHandler(BaseHandler):
self.distributor.declare("registered_user")
self.captcha_client = CaptchaServerHttpClient(hs)
self._next_generated_user_id = None
@defer.inlineCallbacks
def check_username(self, localpart, guest_access_token=None):
yield run_on_reactor()
@ -91,7 +92,7 @@ class RegistrationHandler(BaseHandler):
Args:
localpart : The local part of the user ID to register. If None,
one will be randomly generated.
one will be generated.
password (str) : The password to assign to this user so they can
login again. This can be None which means they cannot login again
via a password (e.g. the user is an application service user).
@ -108,6 +109,18 @@ class RegistrationHandler(BaseHandler):
if localpart:
yield self.check_username(localpart, guest_access_token=guest_access_token)
was_guest = guest_access_token is not None
if not was_guest:
try:
int(localpart)
raise RegistrationError(
400,
"Numeric user IDs are reserved for guest users."
)
except ValueError:
pass
user = UserID(localpart, self.hs.hostname)
user_id = user.to_string()
@ -118,40 +131,36 @@ class RegistrationHandler(BaseHandler):
user_id=user_id,
token=token,
password_hash=password_hash,
was_guest=guest_access_token is not None,
was_guest=was_guest,
make_guest=make_guest,
)
yield registered_user(self.distributor, user)
else:
# autogen a random user ID
# autogen a sequential user ID
attempts = 0
user_id = None
token = None
while not user_id:
user = None
while not user:
localpart = yield self._generate_user_id(attempts > 0)
user = UserID(localpart, self.hs.hostname)
user_id = user.to_string()
yield self.check_user_id_is_valid(user_id)
if generate_token:
token = self.auth_handler().generate_access_token(user_id)
try:
localpart = self._generate_user_id()
user = UserID(localpart, self.hs.hostname)
user_id = user.to_string()
yield self.check_user_id_is_valid(user_id)
if generate_token:
token = self.auth_handler().generate_access_token(user_id)
yield self.store.register(
user_id=user_id,
token=token,
password_hash=password_hash,
make_guest=make_guest
)
yield registered_user(self.distributor, user)
except SynapseError:
# if user id is taken, just generate another
user_id = None
token = None
attempts += 1
if attempts > 5:
raise RegistrationError(
500, "Cannot generate user ID.")
yield registered_user(self.distributor, user)
# We used to generate default identicons here, but nowadays
# we want clients to generate their own as part of their branding
@ -283,8 +292,16 @@ class RegistrationHandler(BaseHandler):
errcode=Codes.EXCLUSIVE
)
def _generate_user_id(self):
return "-" + stringutils.random_string(18)
@defer.inlineCallbacks
def _generate_user_id(self, reseed=False):
if reseed or self._next_generated_user_id is None:
self._next_generated_user_id = (
yield self.store.find_next_generated_user_id_localpart()
)
id = self._next_generated_user_id
self._next_generated_user_id += 1
defer.returnValue(str(id))
@defer.inlineCallbacks
def _validate_captcha(self, ip_addr, private_key, challenge, response):

36
synapse/storage/registration.py
View file

@ -13,6 +13,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
import re
from twisted.internet import defer
from synapse.api.errors import StoreError, Codes
@ -351,3 +353,37 @@ class RegistrationStore(SQLBaseStore):
ret = yield self.runInteraction("count_users", _count_users)
defer.returnValue(ret)
@defer.inlineCallbacks
def find_next_generated_user_id_localpart(self):
"""
Gets the localpart of the next generated user ID.
Generated user IDs are integers, and we aim for them to be as small as
we can. Unfortunately, it's possible some of them are already taken by
existing users, and there may be gaps in the already taken range. This
function returns the start of the first allocatable gap. This is to
avoid the case of ID 10000000 being pre-allocated, so us wasting the
first (and shortest) many generated user IDs.
"""
def _find_next_generated_user_id(txn):
txn.execute("SELECT name FROM users")
rows = self.cursor_to_dict(txn)
regex = re.compile("^@(\d+):")
found = set()
for r in rows:
user_id = r["name"]
match = regex.search(user_id)
if match:
found.add(int(match.group(1)))
for i in xrange(len(found) + 1):
if i not in found:
return i
defer.returnValue((yield self.runInteraction(
"find_next_generated_user_id",
_find_next_generated_user_id
)))