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from __future__ import annotations
import sqlite3
import secrets
from typing import Any
from websitebench.site_backend import PaymentConflict, PaymentRejected
TRIAL_PLAN = {
"course_id": "deep-learning-specialization",
"currency": "CNY",
"fingerprint": "a8f095ae0d249f93a5c6adfeb1729f4580139a88046ee210560b71e4a2f83f7e",
"plan_id": "deep-learning-specialization-trial",
"plan_label": "Deep Learning Specialization 7-day trial",
"pricing_evidence": "observed-authenticated-checkout-display",
"renewal_currency": "CNY",
"renewal_interval": "month",
"renewal_minor": 19600,
"subtotal_minor": 0,
"tax_minor": 0,
"total_minor": 0,
"trial_days": 7,
}
COURSE_ID = str(TRIAL_PLAN["course_id"])
PLAN_ID = str(TRIAL_PLAN["plan_id"])
PLAN_FINGERPRINT = str(TRIAL_PLAN["fingerprint"])
FROZEN_TIME = "2026-08-16T00:00:00Z"
_SCHEMA = (
"""CREATE TABLE IF NOT EXISTS coursera_checkout_drafts (
draft_id TEXT PRIMARY KEY,
owner_subject_id TEXT NOT NULL,
course_id TEXT NOT NULL,
plan_id TEXT NOT NULL,
plan_label TEXT NOT NULL,
subtotal_minor INTEGER NOT NULL,
tax_minor INTEGER NOT NULL,
total_minor INTEGER NOT NULL,
currency TEXT NOT NULL,
trial_days INTEGER NOT NULL,
renewal_minor INTEGER NOT NULL,
renewal_currency TEXT NOT NULL,
renewal_interval TEXT NOT NULL,
fingerprint TEXT NOT NULL,
payment_flow_id TEXT NOT NULL UNIQUE,
status TEXT NOT NULL CHECK(status IN ('OPEN','COMPLETED','CANCELED')),
created_at TEXT NOT NULL,
updated_at TEXT NOT NULL
)""",
"""CREATE TABLE IF NOT EXISTS coursera_orders (
order_id TEXT PRIMARY KEY,
owner_subject_id TEXT NOT NULL,
draft_id TEXT NOT NULL UNIQUE REFERENCES coursera_checkout_drafts(draft_id),
payment_flow_id TEXT NOT NULL UNIQUE,
enrollment_id INTEGER NOT NULL REFERENCES coursera_enrollments(enrollment_id),
course_id TEXT NOT NULL,
plan_id TEXT NOT NULL,
plan_label TEXT NOT NULL,
subtotal_minor INTEGER NOT NULL,
tax_minor INTEGER NOT NULL,
total_minor INTEGER NOT NULL,
currency TEXT NOT NULL,
trial_days INTEGER NOT NULL,
renewal_minor INTEGER NOT NULL,
renewal_currency TEXT NOT NULL,
renewal_interval TEXT NOT NULL,
fingerprint TEXT NOT NULL,
status TEXT NOT NULL CHECK(status IN ('PAID','CANCELED')),
created_at TEXT NOT NULL,
canceled_at TEXT
)""",
"""CREATE UNIQUE INDEX IF NOT EXISTS coursera_one_active_paid_order
ON coursera_orders(owner_subject_id,course_id)
WHERE status='PAID'""",
)
def migrate(connection: sqlite3.Connection) -> None:
"""Install checkout tables in the caller's site migration transaction."""
for statement in _SCHEMA:
connection.execute(statement)
_add_trial_columns(connection, "coursera_checkout_drafts")
_add_trial_columns(connection, "coursera_orders")
def _add_trial_columns(connection: sqlite3.Connection, table: str) -> None:
"""Preserve legacy snapshots while making new trial facts durable."""
columns = {row[1] for row in connection.execute(f"PRAGMA table_info({table})")}
additions = {
"trial_days": "INTEGER NOT NULL DEFAULT 0",
"renewal_minor": "INTEGER NOT NULL DEFAULT 0",
"renewal_currency": "TEXT NOT NULL DEFAULT 'USD'",
"renewal_interval": "TEXT NOT NULL DEFAULT 'none'",
}
for name, definition in additions.items():
if name not in columns:
connection.execute(f"ALTER TABLE {table} ADD COLUMN {name} {definition}")
def plan() -> dict[str, Any]:
"""Return a copy of the one current server-owned plan."""
return dict(TRIAL_PLAN)
def _persisted_plan_facts() -> dict[str, Any]:
"""Return the server-owned trial fields persisted on drafts and orders."""
return {
key: value
for key, value in TRIAL_PLAN.items()
if key != "pricing_evidence"
}
def _draft_dict(row: sqlite3.Row) -> dict[str, Any]:
return dict(row)
def create_draft(
owner: str,
*,
course_id: str,
plan_id: str,
) -> dict[str, Any]:
"""Create one owner-bound draft and generated sandbox payment flow."""
if course_id != COURSE_ID or plan_id != PLAN_ID:
raise ValueError("plan is unavailable")
from backend import learning_db
backend, _auth = learning_db.services()
draft_id = f"checkout_{secrets.token_urlsafe(18)}"
with learning_db.connection(transaction=True) as opened:
owner_exists = opened.execute(
"SELECT 1 FROM coursera_profiles WHERE subject_id=?", (owner,)
).fetchone()
if owner_exists is None:
raise LookupError("Learner not found")
flow = backend.payments.create_intent(
owner=owner,
amount_minor=int(TRIAL_PLAN["total_minor"]),
currency=str(TRIAL_PLAN["currency"]),
fingerprint=PLAN_FINGERPRINT,
idempotency_key=f"draft-create:{draft_id}",
adapter="local-sandbox",
connection=opened,
)
opened.execute(
"""INSERT INTO coursera_checkout_drafts(
draft_id,owner_subject_id,course_id,plan_id,plan_label,
subtotal_minor,tax_minor,total_minor,currency,fingerprint,
trial_days,renewal_minor,renewal_currency,renewal_interval,
payment_flow_id,status,created_at,updated_at)
VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,'OPEN',?,?)""",
(
draft_id,
owner,
TRIAL_PLAN["course_id"],
TRIAL_PLAN["plan_id"],
TRIAL_PLAN["plan_label"],
TRIAL_PLAN["subtotal_minor"],
TRIAL_PLAN["tax_minor"],
TRIAL_PLAN["total_minor"],
TRIAL_PLAN["currency"],
PLAN_FINGERPRINT,
TRIAL_PLAN["trial_days"],
TRIAL_PLAN["renewal_minor"],
TRIAL_PLAN["renewal_currency"],
TRIAL_PLAN["renewal_interval"],
flow["flow_id"],
FROZEN_TIME,
FROZEN_TIME,
),
)
row = opened.execute(
"SELECT * FROM coursera_checkout_drafts WHERE draft_id=?",
(draft_id,),
).fetchone()
if row is None: # pragma: no cover - insert invariant
raise RuntimeError("checkout draft insert returned no row")
return _draft_dict(row)
def get_draft(owner: str, draft_id: str) -> dict[str, Any]:
"""Read one checkout draft without revealing foreign records."""
from backend import learning_db
with learning_db.connection() as opened:
row = opened.execute(
"""SELECT * FROM coursera_checkout_drafts
WHERE draft_id=? AND owner_subject_id=?""",
(draft_id, owner),
).fetchone()
if row is None:
raise LookupError("Checkout not found")
return _draft_dict(row)
def _order_dict(row: sqlite3.Row) -> dict[str, Any]:
return dict(row)
def _payment_attempt_dict(
row: sqlite3.Row, *, replay_approved: bool = False
) -> dict[str, Any]:
return {
"attempt_id": row["attempt_id"],
"site_id": row["site_id"],
"flow_id": row["flow_id"],
"owner": row["owner"],
"scenario_id": row["scenario_id"],
"amount_minor": int(row["amount_minor"]),
"currency": row["currency"],
"fingerprint": row["fingerprint"],
"status": "APPROVED" if replay_approved else row["status"],
"is_simulation": bool(row["is_simulation"]),
}
def list_orders(owner: str) -> list[dict[str, Any]]:
"""List durable order snapshots for one owner."""
from backend import learning_db
with learning_db.connection() as opened:
return [
_order_dict(row)
for row in opened.execute(
"""SELECT * FROM coursera_orders WHERE owner_subject_id=?
ORDER BY created_at DESC,order_id DESC""",
(owner,),
)
]
def get_order(owner: str, order_id: str) -> dict[str, Any]:
"""Read one order snapshot without revealing foreign records."""
from backend import learning_db
with learning_db.connection() as opened:
row = opened.execute(
"""SELECT * FROM coursera_orders
WHERE order_id=? AND owner_subject_id=?""",
(order_id, owner),
).fetchone()
if row is None:
raise LookupError("Order not found")
return _order_dict(row)
def get_order_for_enrollment(owner: str, enrollment_id: int) -> dict[str, Any]:
"""Resolve the current paid order for an owner-scoped enrollment."""
from backend import learning_db
with learning_db.connection() as opened:
row = opened.execute(
"""SELECT * FROM coursera_orders
WHERE enrollment_id=? AND owner_subject_id=?
ORDER BY CASE status WHEN 'PAID' THEN 0 ELSE 1 END,rowid DESC
LIMIT 1""",
(enrollment_id, owner),
).fetchone()
if row is None:
raise LookupError("Order not found")
return _order_dict(row)
def attempt(
owner: str,
draft_id: str,
*,
scenario_id: str,
idempotency_key: str,
) -> dict[str, Any]:
"""Attempt sandbox payment and atomically materialize approved business state."""
from backend import learning_db
backend, _auth = learning_db.services()
with learning_db.connection(transaction=True) as opened:
draft = opened.execute(
"""SELECT * FROM coursera_checkout_drafts
WHERE draft_id=? AND owner_subject_id=?""",
(draft_id, owner),
).fetchone()
if draft is None:
raise LookupError("Checkout not found")
current_facts = _persisted_plan_facts()
if any(draft[key] != value for key, value in current_facts.items()):
raise PaymentRejected("checkout facts are stale")
if draft["status"] == "COMPLETED":
order = opened.execute(
"""SELECT * FROM coursera_orders
WHERE draft_id=? AND owner_subject_id=? AND payment_flow_id=?""",
(draft_id, owner, draft["payment_flow_id"]),
).fetchone()
prior_attempt = opened.execute(
"""SELECT * FROM websitebench_payment_attempts
WHERE flow_id=? AND owner=? AND scenario_id=?
AND idempotency_key=? AND status='CONSUMED'""",
(
draft["payment_flow_id"],
owner,
scenario_id,
idempotency_key,
),
).fetchone()
order_facts = _persisted_plan_facts()
if (
order is not None
and prior_attempt is not None
and all(order[key] == value for key, value in order_facts.items())
):
return {
"attempt": _payment_attempt_dict(
prior_attempt, replay_approved=True
),
"order": _order_dict(order),
"outcome": "approved",
}
raise PaymentRejected("checkout is no longer open")
if draft["status"] != "OPEN":
raise PaymentRejected("checkout is no longer open")
existing_paid_order = opened.execute(
"""SELECT order_id FROM coursera_orders
WHERE owner_subject_id=? AND course_id=? AND status='PAID'""",
(owner, COURSE_ID),
).fetchone()
if existing_paid_order is not None:
raise PaymentConflict("active paid order already exists")
payment_attempt = backend.payments.attempt(
flow_id=str(draft["payment_flow_id"]),
owner=owner,
amount_minor=int(TRIAL_PLAN["total_minor"]),
currency=str(TRIAL_PLAN["currency"]),
fingerprint=PLAN_FINGERPRINT,
scenario_id=scenario_id,
idempotency_key=idempotency_key,
connection=opened,
)
outcome = {
"APPROVED": "approved",
"DECLINED": "declined",
"RETRYABLE": "retryable",
}[str(payment_attempt["status"])]
if outcome != "approved":
return {
"attempt": payment_attempt,
"order": None,
"outcome": outcome,
}
backend.payments.consume_approval(
opened,
flow_id=str(draft["payment_flow_id"]),
owner=owner,
amount_minor=int(TRIAL_PLAN["total_minor"]),
currency=str(TRIAL_PLAN["currency"]),
fingerprint=PLAN_FINGERPRINT,
)
enrollment = opened.execute(
"""INSERT INTO coursera_enrollments(
owner_subject_id,course_id,track,status,created_at,canceled_at)
VALUES (?,?,'paid','active',?,NULL)
ON CONFLICT(owner_subject_id,course_id) DO UPDATE SET
track='paid',status='active'
RETURNING enrollment_id""",
(owner, COURSE_ID, FROZEN_TIME),
).fetchone()
if enrollment is None: # pragma: no cover - SQLite RETURNING invariant
raise RuntimeError("paid enrollment upsert returned no row")
order_id = f"order_{secrets.token_urlsafe(18)}"
opened.execute(
"""INSERT INTO coursera_orders(
order_id,owner_subject_id,draft_id,payment_flow_id,enrollment_id,
course_id,plan_id,plan_label,subtotal_minor,tax_minor,total_minor,
currency,fingerprint,trial_days,renewal_minor,renewal_currency,
renewal_interval,status,created_at,canceled_at)
VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,'PAID',?,NULL)""",
(
order_id,
owner,
draft_id,
draft["payment_flow_id"],
int(enrollment["enrollment_id"]),
TRIAL_PLAN["course_id"],
TRIAL_PLAN["plan_id"],
TRIAL_PLAN["plan_label"],
TRIAL_PLAN["subtotal_minor"],
TRIAL_PLAN["tax_minor"],
TRIAL_PLAN["total_minor"],
TRIAL_PLAN["currency"],
PLAN_FINGERPRINT,
TRIAL_PLAN["trial_days"],
TRIAL_PLAN["renewal_minor"],
TRIAL_PLAN["renewal_currency"],
TRIAL_PLAN["renewal_interval"],
FROZEN_TIME,
),
)
changed = opened.execute(
"""UPDATE coursera_checkout_drafts
SET status='COMPLETED',updated_at=?
WHERE draft_id=? AND owner_subject_id=? AND status='OPEN'""",
(FROZEN_TIME, draft_id, owner),
).rowcount
if changed != 1: # pragma: no cover - write transaction invariant
raise RuntimeError("checkout draft was concurrently completed")
order = opened.execute(
"SELECT * FROM coursera_orders WHERE order_id=?", (order_id,)
).fetchone()
if order is None: # pragma: no cover - insert invariant
raise RuntimeError("order insert returned no row")
return {
"attempt": payment_attempt,
"order": _order_dict(order),
"outcome": outcome,
}
def cancel_order(owner: str, order_id: str) -> dict[str, Any]:
"""Cancel one paid order and its enrollment in the same transaction."""
from backend import learning_db
with learning_db.connection(transaction=True) as opened:
order = opened.execute(
"""SELECT * FROM coursera_orders
WHERE order_id=? AND owner_subject_id=?""",
(order_id, owner),
).fetchone()
if order is None:
raise LookupError("Order not found")
if order["status"] == "PAID":
opened.execute(
"""UPDATE coursera_orders SET status='CANCELED',canceled_at=?
WHERE order_id=? AND owner_subject_id=? AND status='PAID'""",
(FROZEN_TIME, order_id, owner),
)
changed = opened.execute(
"""UPDATE coursera_enrollments
SET status='canceled',canceled_at=?
WHERE enrollment_id=? AND owner_subject_id=?""",
(FROZEN_TIME, int(order["enrollment_id"]), owner),
).rowcount
if changed != 1:
raise RuntimeError("paid enrollment was not found")
order = opened.execute(
"SELECT * FROM coursera_orders WHERE order_id=?", (order_id,)
).fetchone()
return _order_dict(order)
def reset(connection: sqlite3.Connection) -> None:
"""Clear mutable checkout state before learning and runtime reset."""
connection.execute("DELETE FROM coursera_orders")
connection.execute("DELETE FROM coursera_checkout_drafts")
def snapshot_queries() -> dict[str, str]:
"""Expose deterministic checkout rows to the site reset snapshot."""
return {
"checkout_drafts": ("SELECT * FROM coursera_checkout_drafts ORDER BY draft_id"),
"orders": "SELECT * FROM coursera_orders ORDER BY order_id",
}
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