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fb2916f | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 | """Account, session and recovery flows for the LeetCode offline clone.
Every credential, challenge and session fact is owned by the vendored
``websitebench.local_clone_auth`` store opened through
``backend/site_backend_integration.py``. This module only adds the site's own
vocabulary on top of it: a username, the human-verification widget, and the
copy the pages show.
"""
from __future__ import annotations
import hmac
import hashlib
import re
import sqlite3
from typing import Any
from websitebench.local_clone_auth import (
AuthConflict,
AuthError,
AuthExpired,
AuthLocked,
AuthRateLimited,
AuthRejected,
AuthValidationError,
)
from . import store
USERNAME_RE = re.compile(r"^[A-Za-z0-9_-]{3,30}$")
VERIFICATION_FIELD = "human_verification"
VERIFICATION_CHECKBOX = "human_check"
RESET_PUBLIC_MESSAGE = (
"If that address belongs to a LeetCode account, a verification code is on "
"its way."
)
class FormError(Exception):
"""A field-level validation failure to render back into the form."""
def __init__(self, errors: dict[str, str]) -> None:
self.errors = errors
super().__init__("; ".join(f"{key}: {value}" for key, value in errors.items()))
def services() -> tuple[Any, Any]:
return store.services()
def session_cookie_settings() -> dict[str, Any]:
backend, _ = services()
return dict(backend.session_cookie)
def mail_template(purpose: str) -> dict[str, Any]:
backend, _ = services()
return dict(backend.config.mail["purposes"][purpose])
def sender_display_name() -> str:
backend, _ = services()
return str(backend.config.mail["sender"]["display_name"])
# ---------------------------------------------------------------------------
# human verification widget (local only)
# ---------------------------------------------------------------------------
def verification_token(session_token: str) -> str:
"""A per-session token for the local human-verification widget.
The widget reproduces the source page's challenge slot and its local
semantics only: the server issues a token bound to this session and
refuses a submission that does not carry it back. Nothing is fetched from,
or validated against, any third-party challenge service.
"""
_, auth = services()
digest = auth.session_owner_digest(session_token)
return hashlib.sha256(f"leetcode-verification\0{digest}".encode()).hexdigest()[:32]
def verification_ok(session_token: str, form: dict[str, str]) -> bool:
supplied = str(form.get(VERIFICATION_FIELD, ""))
checked = str(form.get(VERIFICATION_CHECKBOX, "")).strip().casefold()
if checked not in {"on", "true", "1", "yes"}:
return False
try:
expected = verification_token(session_token)
except AuthError:
return False
return hmac.compare_digest(expected, supplied)
# ---------------------------------------------------------------------------
# sessions
# ---------------------------------------------------------------------------
def ensure_session(token: str | None) -> tuple[str, dict[str, Any]]:
_, auth = services()
return auth.ensure_session(token)
def current_member(session_info: dict[str, Any]) -> dict[str, Any] | None:
account = session_info.get("account")
if not account:
return None
profile = store.profile_for_subject(str(account["subject_id"]))
if profile is None:
return None
return {
"subject_id": profile["subject_id"],
"username": profile["username"],
"email": profile["email_normalized"],
}
# ---------------------------------------------------------------------------
# registration
# ---------------------------------------------------------------------------
def validate_signup(form: dict[str, str]) -> dict[str, str]:
username = str(form.get("username", "")).strip()
password = str(form.get("password", ""))
confirm = str(form.get("confirm_password", ""))
email = str(form.get("email", "")).strip()
errors: dict[str, str] = {}
if not username:
errors["username"] = "Username is required."
elif USERNAME_RE.fullmatch(username) is None:
errors["username"] = (
"Use 3 to 30 letters, digits, hyphens or underscores."
)
elif store.username_taken(username):
errors["username"] = "That username is already taken."
if not password:
errors["password"] = "Password is required."
elif len(password) < 8:
errors["password"] = "Password must contain at least 8 characters."
if confirm != password:
errors["confirm_password"] = "The two passwords do not match."
if not email:
errors["email"] = "E-mail address is required."
if errors:
raise FormError(errors)
return {"username": username, "password": password, "email": email}
def start_signup(session_token: str, form: dict[str, str]) -> dict[str, Any]:
values = validate_signup(form)
_, auth = services()
try:
result = auth.start_registration(
session_token,
email=values["email"],
display_name=values["username"],
password=values["password"],
restart_invalid_flow=True,
)
except AuthValidationError as error:
raise FormError({"email": _readable(error)}) from error
except AuthConflict:
raise FormError(
{"email": "An account already exists for that e-mail address."}
) from None
except AuthRateLimited as error:
raise FormError(
{
"email": (
"Please wait "
f"{error.retry_after} seconds before requesting another code."
)
}
) from None
return {"pending_id": result["pending_id"], "email": values["email"]}
def confirm_signup(session_token: str, code: str) -> str:
"""Verify the emailed code and create the account plus its member row.
The username the visitor chose is carried by the auth store's own pending
registration record (its ``display_name``), so nothing about a half-finished
sign-up has to live in a second cookie or table.
"""
_, auth = services()
try:
auth.verify_registration_code(session_token, code)
except AuthValidationError:
raise FormError({"code": "Enter the six-digit verification code."}) from None
except AuthLocked:
raise FormError(
{"code": "Too many attempts. Start the sign-up again."}
) from None
except AuthExpired:
raise FormError({"code": "That code expired. Request a new one."}) from None
except AuthRejected:
raise FormError({"code": "That code is not correct."}) from None
def _subject_factory(
connection: sqlite3.Connection, registration: dict[str, Any]
) -> str:
return store.create_profile(
connection,
account_id=str(registration["account_id"]),
username=str(registration["display_name"]),
email=str(registration["email"]),
)
try:
result = auth.complete_registration(
session_token, subject_factory=_subject_factory
)
except sqlite3.IntegrityError:
raise FormError({"username": "That username is already taken."}) from None
except AuthConflict:
raise FormError(
{"email": "An account already exists for that e-mail address."}
) from None
except AuthRejected as error:
raise FormError({"code": _readable(error)}) from None
return str(result["session_token"])
# ---------------------------------------------------------------------------
# sign in / sign out
# ---------------------------------------------------------------------------
def sign_in(session_token: str, form: dict[str, str]) -> str:
identifier = str(form.get("login", "")).strip()
password = str(form.get("password", ""))
errors: dict[str, str] = {}
if not identifier:
errors["login"] = "Username or e-mail is required."
if not password:
errors["password"] = "Password is required."
if errors:
raise FormError(errors)
_, auth = services()
try:
result = auth.sign_in(
session_token,
email=store.resolve_login_email(identifier),
password=password,
)
except (AuthRejected, AuthValidationError):
raise FormError(
{"form": "The username, e-mail or password is not correct."}
) from None
return str(result["session_token"])
def sign_out(session_token: str | None) -> None:
_, auth = services()
auth.sign_out(session_token)
# ---------------------------------------------------------------------------
# password recovery
# ---------------------------------------------------------------------------
def start_password_reset(session_token: str, email: str) -> None:
_, auth = services()
if not email.strip():
raise FormError({"email": "E-mail address is required."})
try:
auth.start_password_reset(
session_token, email=email, restart_invalid_flow=True
)
except AuthValidationError:
raise FormError({"email": "Enter a valid e-mail address."}) from None
except AuthRateLimited as error:
raise FormError(
{
"email": (
"Please wait "
f"{error.retry_after} seconds before requesting another code."
)
}
) from None
def confirm_password_reset(session_token: str, code: str, new_password: str) -> str:
errors: dict[str, str] = {}
if not code.strip():
errors["code"] = "Enter the six-digit verification code."
if len(new_password) < 8:
errors["password"] = "Password must contain at least 8 characters."
if errors:
raise FormError(errors)
_, auth = services()
try:
auth.verify_password_reset_code(session_token, code)
except AuthValidationError:
raise FormError({"code": "Enter the six-digit verification code."}) from None
except AuthLocked:
raise FormError(
{"code": "Too many attempts. Start the reset again."}
) from None
except AuthExpired:
raise FormError({"code": "That code expired. Request a new one."}) from None
except AuthRejected:
raise FormError({"code": "That code is not correct."}) from None
try:
return str(
auth.complete_password_reset(session_token, new_password=new_password)
)
except AuthValidationError as error:
raise FormError({"password": _readable(error)}) from None
except AuthRejected as error:
raise FormError({"code": _readable(error)}) from None
# ---------------------------------------------------------------------------
# local message delivery
# ---------------------------------------------------------------------------
def pending_signup_stage(session_token: str) -> bool:
"""Whether this session has a registration challenge waiting for a code."""
return flow_status(session_token, "registration").get("state") in {
"challenge",
"verified",
}
def pending_message(session_token: str, purpose: str) -> dict[str, Any] | None:
"""Render the message this device would receive for the current flow."""
_, auth = services()
record = auth.local_mail_for_session(session_token, purpose=purpose)
if record is None:
return None
template = mail_template(purpose)
variables = {"code": str(record["verification_code"]), "minutes": "10"}
return {
"purpose": purpose,
"sender": sender_display_name(),
"recipient": record["recipient"],
"subject": _fill(template["subject"], variables),
"lead": _fill(template["lead"], variables),
"body": _fill(template["body"], variables),
"expiry": _fill(template["expiry"], variables),
"footer": _fill(template["footer"], variables),
"code": variables["code"],
}
def flow_status(session_token: str, purpose: str) -> dict[str, Any]:
_, auth = services()
return auth.session_flow_status(session_token, purpose=purpose)
def _fill(text: str, variables: dict[str, str]) -> str:
filled = text
for key, value in variables.items():
filled = filled.replace("${" + key + "}", value).replace("$" + key, value)
return filled
def _readable(error: Exception) -> str:
message = str(error).strip()
if not message:
return "That value is not valid."
return message[0].upper() + message[1:] + ("" if message.endswith(".") else ".")
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