Files
LLeMbas/src/lembas/security/passwords.py
T
Jaroslav Beneš 0f44e8d24c Working chat: auth, connections, streaming, folders
LLeMbas now runs end to end. Register, add an OpenAI-compatible
connection, and hold a real streaming conversation organised into
folders. Verified against the local llama-swap instance.

Streaming is the one genuinely tricky part. Sending a message returns
two HTML fragments -- the user bubble and an empty assistant bubble
carrying an sse-connect -- and that attribute is the ONLY thing that
starts a generation. Rendering an incomplete assistant message as a
streaming shell falls out of the same template, which means loading a
page whose last reply never finished simply picks it up again.

Details worth knowing about, each commented where it matters:

- SSE payloads are split across several data: lines. A raw newline in
  one data: line truncates the event, which shows up the first time a
  model emits a code block.
- Markdown is rendered server-side by the same helper for both the page
  and the final streamed frame, so the two cannot disagree. The fence
  renderer is replaced outright rather than using markdown-it's
  highlight option, which re-wraps output in a second <pre>.
- escape_text is html.escape, not nh3.clean_text: it escapes character
  by character, so escaping stream chunks separately equals escaping
  the whole string.
- The stream opens its own session via session_scope(); it outlives the
  request handler and the dependency-scoped session may be closed.
- Deleting a folder keeps the chats inside it (FK is SET NULL). Losing
  a conversation to a mis-clicked folder delete is unforgivable.
- Login failures use one message for "no such account" and "wrong
  password" so the form cannot enumerate registered addresses.

Also adds deploy/ for the gamebox install at https://chat.lan: system
unit, nginx vhost with buffering off (buffering on turns streaming into
one lump at the end), and install/update scripts following the same
service-user and /srv bind-mount conventions as llama-swap and comfyui.

70 tests, ruff clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-21 11:04:13 +02:00

41 lines
1.1 KiB
Python

"""Password hashing.
Argon2id via argon2-cffi, using the library's current recommended parameters.
``needs_rehash`` lets stored hashes be upgraded transparently when those
defaults tighten in a future release.
"""
from __future__ import annotations
from argon2 import PasswordHasher
from argon2.exceptions import InvalidHashError, VerificationError, VerifyMismatchError
_hasher = PasswordHasher()
MIN_PASSWORD_LENGTH = 8
def hash_password(password: str) -> str:
return _hasher.hash(password)
def verify_password(password: str, password_hash: str) -> bool:
try:
return _hasher.verify(password_hash, password)
except (VerifyMismatchError, VerificationError, InvalidHashError):
return False
def needs_rehash(password_hash: str) -> bool:
try:
return _hasher.check_needs_rehash(password_hash)
except InvalidHashError:
return True
def validate_password(password: str) -> str | None:
"""Return a human-readable problem with the password, or None if it is fine."""
if len(password) < MIN_PASSWORD_LENGTH:
return f"Password must be at least {MIN_PASSWORD_LENGTH} characters."
return None