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| """Multi-user basic-auth list for the HF Space deployment. | |
| Four fixed login strings. Each password comes from a Space secret. The | |
| 'students' login keeps using the long-standing ME_CHAT_PASSWORD secret | |
| so the password already shared with the class continues to work. | |
| Used by deploy/hf-space/app.py. Importable from anywhere in scripts/lib | |
| so unit tests can exercise it without loading the Space's hyphen-pathed | |
| app.py. | |
| """ | |
| from __future__ import annotations | |
| import os | |
| from typing import List, Tuple | |
| # Fixed login order. The order is the order Gradio displays internally | |
| # but is otherwise irrelevant to behavior. | |
| _LOGIN_TO_ENV: List[Tuple[str, str]] = [ | |
| ("robert", "ME_CHAT_PASSWORD_ROBERT"), | |
| ("pino", "ME_CHAT_PASSWORD_PINO"), | |
| ("udayan", "ME_CHAT_PASSWORD_UDAYAN"), | |
| ("students", "ME_CHAT_PASSWORD"), | |
| ] | |
| class MissingPasswordError(RuntimeError): | |
| """Raised when a required ME_CHAT_PASSWORD_* secret is unset.""" | |
| def build_auth() -> List[Tuple[str, str]]: | |
| """Return the four (login, password) tuples for Gradio's auth=. Raises | |
| MissingPasswordError naming the first unset env var.""" | |
| pairs: List[Tuple[str, str]] = [] | |
| for login, env_var in _LOGIN_TO_ENV: | |
| password = os.environ.get(env_var) | |
| # Treat both unset and empty-string as missing — HF Space UI can | |
| # silently save a blank value, and Gradio basic auth with an empty | |
| # password is worse than a clear startup error. | |
| if not password: | |
| raise MissingPasswordError( | |
| f"required env var {env_var} (for login '{login}') is unset" | |
| ) | |
| pairs.append((login, password)) | |
| return pairs | |