156 行
4.5 KiB
Python
156 行
4.5 KiB
Python
import time
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from math import inf
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from quart import current_app
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from anonstream.wrappers import try_except_log, with_timestamp
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from anonstream.helpers.user import is_visible
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from anonstream.helpers.captcha import check_captcha_digest, Answer
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from anonstream.helpers.tripcode import generate_tripcode
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from anonstream.utils.colour import color_to_colour, get_contrast, NotAColor
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from anonstream.utils.user import get_user_for_websocket
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CONFIG = current_app.config
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MESSAGES = current_app.messages
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USERS = current_app.users
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CAPTCHA_SIGNER = current_app.captcha_signer
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USERS_UPDATE_BUFFER = current_app.users_update_buffer
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class BadAppearance(ValueError):
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pass
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class BadCaptcha(ValueError):
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pass
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def add_state(user, **state):
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state_id = time.time_ns() // 1_000_000
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user['state'][state_id] = state
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while len(user['state']) > CONFIG['MAX_STATES']:
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user['state'].popitem(last=False)
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return state_id
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def pop_state(user, state_id):
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try:
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state = user['state'].pop(state_id)
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except KeyError:
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state = None
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return state
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def try_change_appearance(user, name, color, password,
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want_delete_tripcode, want_change_tripcode):
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errors = []
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def try_(f, *args, **kwargs):
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return try_except_log(errors, BadAppearance)(f)(*args, **kwargs)
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try_(change_name, user, name, dry_run=True)
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try_(change_color, user, color, dry_run=True)
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if want_delete_tripcode:
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pass
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elif want_change_tripcode:
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try_(change_tripcode, user, password, dry_run=True)
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if not errors:
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change_name(user, name)
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change_color(user, color)
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if want_delete_tripcode:
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delete_tripcode(user)
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elif want_change_tripcode:
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change_tripcode(user, password)
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# Add to the users update buffer
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USERS_UPDATE_BUFFER.add(user['token'])
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return errors
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def change_name(user, name, dry_run=False):
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if dry_run:
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if name is not None:
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if len(name) == 0:
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raise BadAppearance('Name was empty')
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if len(name) > 24:
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raise BadAppearance('Name exceeded 24 chars')
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else:
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user['name'] = name
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def change_color(user, color, dry_run=False):
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if dry_run:
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try:
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colour = color_to_colour(color)
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except NotAColor:
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raise BadAppearance('Invalid CSS color')
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contrast = get_contrast(
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CONFIG['CHAT_BACKGROUND_COLOUR'],
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colour,
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)
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min_contrast = CONFIG['CHAT_NAME_MIN_CONTRAST']
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if contrast < min_contrast:
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raise BadAppearance(
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'Colour had insufficient contrast:',
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(f'{contrast:.2f}', f'/{min_contrast}'),
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)
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else:
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user['color'] = color
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def change_tripcode(user, password, dry_run=False):
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if dry_run:
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if len(password) > 1024:
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raise BadAppearance('Password exceeded 1024 chars')
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else:
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user['tripcode'] = generate_tripcode(password)
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def delete_tripcode(user):
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user['tripcode'] = None
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@with_timestamp
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def see(timestamp, user):
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user['last']['seen'] = timestamp
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@with_timestamp
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def watched(timestamp, user):
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user['last']['seen'] = timestamp
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user['last']['watching'] = timestamp
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@with_timestamp
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def get_all_users_for_websocket(timestamp):
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visible_users = filter(
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lambda user: is_visible(timestamp, MESSAGES, user),
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USERS,
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)
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return {
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user['token_hash']: get_user_for_websocket(user)
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for user in visible_users
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}
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def verify(user, digest, answer):
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if user['verified']:
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verification_happened = False
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else:
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match check_captcha_digest(CAPTCHA_SIGNER, digest, answer):
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case Answer.MISSING:
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raise BadCaptcha('Captcha is required')
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case Answer.BAD:
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raise BadCaptcha('Captcha was incorrect')
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case Answer.EXPIRED:
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raise BadCaptcha('Captcha has expired')
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case Answer.OK:
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user['verified'] = True
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verification_happened = True
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return verification_happened
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@with_timestamp
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def deverify(timestamp, user):
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if not user['verified']:
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return
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n_user_messages = 0
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for message in reversed(MESSAGES):
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message_sent_ago = timestamp - message['timestamp']
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if message_sent_ago >= CONFIG['FLOOD_DURATION']:
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break
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elif message['token'] == user['token']:
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n_user_messages += 1
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if n_user_messages >= CONFIG['FLOOD_THRESHOLD']:
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user['verified'] = False
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