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These flows model local drafts and previews only. They never create a seller
account, public registry, gift-card balance, payment, or video entitlement.
"""
from __future__ import annotations
import hashlib
import hmac
import re
import secrets
import unicodedata
from datetime import date
from decimal import Decimal, InvalidOperation
from typing import Any
GIFT_CARDS_PATH = "/gift-cards/b/"
GIFT_CARD_PREVIEW_PATH = "/gift-cards/purchase-preview"
GIFT_CARD_BALANCE_PATH = "/gc/balance/"
GIFT_CARD_REDEEM_PATH = "/gc/redeem/"
SELL_PATH = "/b/"
SELL_DRAFT_PATH = "/b/sell/draft"
REGISTRY_PATH = "/gp/browse.html"
REGISTRY_SEARCH_PATH = "/registry/search"
REGISTRY_CREATE_PATH = "/registry/create"
REGISTRY_DETAIL_PATH = "/registry/detail"
PRIME_VIDEO_PATH = "/Amazon-Video/b/"
GIFT_DESIGNS = {
"classic": "Classic smile",
"birthday": "Birthday confetti",
"thanks": "A little thanks",
}
GIFT_AMOUNTS_MINOR = (2500, 5000, 10000, 20000)
SELL_CATEGORIES = {
"books": "Books",
"electronics": "Electronics",
"home": "Home & Kitchen",
"toys": "Toys & Games",
"beauty": "Beauty & Personal Care",
}
SELL_CONDITIONS = {
"new": "New",
"like-new": "Used - Like New",
"good": "Used - Good",
}
REGISTRY_TYPES = {
"wedding": "Wedding Registry",
"baby": "Baby Registry",
"gift": "Gift List",
}
_REDEMPTION_PEPPER = secrets.token_bytes(32)
_SAFE_CODE = re.compile(r"[A-Z0-9][A-Z0-9-]{7,31}")
_PRICE = re.compile(r"(?:[1-9][0-9]{0,3}|5000)(?:\.[0-9]{2})?")
class SpecialtyValidationError(ValueError):
"""A public specialty form did not satisfy its strict contract."""
def ensure_specialty_schema(store: Any) -> None:
"""Install isolated additive tables without changing the core schema."""
with store.connect() as connection:
connection.executescript(
"""
CREATE TABLE IF NOT EXISTS specialty_gift_card_previews (
preview_id INTEGER PRIMARY KEY AUTOINCREMENT,
session_digest TEXT NOT NULL
REFERENCES browser_sessions(session_digest) ON DELETE CASCADE,
design TEXT NOT NULL CHECK (design IN ('classic','birthday','thanks')),
amount_minor INTEGER NOT NULL CHECK (amount_minor IN (2500,5000,10000,20000)),
recipient_kind TEXT NOT NULL CHECK (recipient_kind IN ('self','gift')),
status TEXT NOT NULL CHECK (status='LOCAL_PREVIEW'),
created_at TEXT NOT NULL
);
CREATE INDEX IF NOT EXISTS specialty_gift_preview_session_idx
ON specialty_gift_card_previews(session_digest,preview_id DESC);
CREATE TABLE IF NOT EXISTS specialty_gift_redemption_attempts (
redemption_id INTEGER PRIMARY KEY AUTOINCREMENT,
session_digest TEXT NOT NULL
REFERENCES browser_sessions(session_digest) ON DELETE CASCADE,
code_fingerprint TEXT NOT NULL CHECK (length(code_fingerprint)=64),
status TEXT NOT NULL CHECK (status='NOT_APPLIED'),
created_at TEXT NOT NULL
);
CREATE INDEX IF NOT EXISTS specialty_gift_redemption_session_idx
ON specialty_gift_redemption_attempts(session_digest,redemption_id DESC);
CREATE TABLE IF NOT EXISTS specialty_seller_drafts (
draft_id INTEGER PRIMARY KEY AUTOINCREMENT,
session_digest TEXT NOT NULL
REFERENCES browser_sessions(session_digest) ON DELETE CASCADE,
title TEXT NOT NULL CHECK (length(title) BETWEEN 5 AND 100),
category TEXT NOT NULL CHECK (category IN ('books','electronics','home','toys','beauty')),
item_condition TEXT NOT NULL CHECK (item_condition IN ('new','like-new','good')),
price_minor INTEGER NOT NULL CHECK (price_minor BETWEEN 100 AND 500000),
quantity INTEGER NOT NULL CHECK (quantity BETWEEN 1 AND 30),
description TEXT NOT NULL CHECK (length(description)<=500),
status TEXT NOT NULL CHECK (status='LOCAL_DRAFT'),
created_at TEXT NOT NULL,
updated_at TEXT NOT NULL
);
CREATE INDEX IF NOT EXISTS specialty_seller_draft_session_idx
ON specialty_seller_drafts(session_digest,draft_id DESC);
CREATE TABLE IF NOT EXISTS specialty_registries (
registry_id INTEGER PRIMARY KEY AUTOINCREMENT,
session_digest TEXT NOT NULL
REFERENCES browser_sessions(session_digest) ON DELETE CASCADE,
registry_type TEXT NOT NULL CHECK (registry_type IN ('wedding','baby','gift')),
owner_name TEXT NOT NULL CHECK (length(owner_name) BETWEEN 2 AND 80),
registry_name TEXT NOT NULL CHECK (length(registry_name) BETWEEN 3 AND 100),
event_date TEXT NOT NULL CHECK (length(event_date) IN (0,10)),
status TEXT NOT NULL CHECK (status='LOCAL_PRIVATE_DRAFT'),
created_at TEXT NOT NULL
);
CREATE INDEX IF NOT EXISTS specialty_registry_session_idx
ON specialty_registries(session_digest,registry_id DESC);
"""
)
def _plain_text(value: str, *, field: str, minimum: int, maximum: int) -> str:
if not isinstance(value, str):
raise SpecialtyValidationError(f"{field} must be text")
normalized = " ".join(unicodedata.normalize("NFKC", value).split())
if not minimum <= len(normalized) <= maximum or any(
ord(character) < 32 or ord(character) == 127 for character in normalized
):
raise SpecialtyValidationError(f"{field} is invalid")
return normalized
def _optional_text(value: str, *, field: str, maximum: int) -> str:
if not isinstance(value, str):
raise SpecialtyValidationError(f"{field} must be text")
normalized = " ".join(unicodedata.normalize("NFKC", value).split())
if len(normalized) > maximum or any(
ord(character) < 32 or ord(character) == 127 for character in normalized
):
raise SpecialtyValidationError(f"{field} is invalid")
return normalized
def _positive_id(value: int | str) -> int | None:
if isinstance(value, bool):
return None
raw = str(value)
if re.fullmatch(r"[1-9][0-9]{0,18}", raw) is None:
return None
parsed = int(raw)
return parsed if parsed <= (1 << 63) - 1 else None
def create_gift_card_preview(
store: Any, session_digest: str, design: str, amount: str, recipient_kind: str
) -> dict[str, Any]:
if design not in GIFT_DESIGNS or recipient_kind not in {"self", "gift"}:
raise SpecialtyValidationError("gift card selection is invalid")
if re.fullmatch(r"(?:25|50|100|200)", amount or "") is None:
raise SpecialtyValidationError("gift card amount is invalid")
ensure_specialty_schema(store)
store.ensure_session(session_digest)
with store.connect() as connection:
cursor = connection.execute(
"""
INSERT INTO specialty_gift_card_previews(
session_digest,design,amount_minor,recipient_kind,status,created_at
) VALUES (?,?,?,?,'LOCAL_PREVIEW',?)
""",
(
session_digest,
design,
int(amount) * 100,
recipient_kind,
store.now(connection),
),
)
preview_id = int(cursor.lastrowid)
connection.commit()
return gift_card_preview(store, session_digest, preview_id) or {}
def gift_card_preview(
store: Any, session_digest: str, preview_id: int | str
) -> dict[str, Any] | None:
normalized = _positive_id(preview_id)
if normalized is None:
return None
ensure_specialty_schema(store)
store.ensure_session(session_digest)
with store.connect() as connection:
row = connection.execute(
"""
SELECT preview_id,design,amount_minor,recipient_kind,status,created_at
FROM specialty_gift_card_previews
WHERE preview_id=? AND session_digest=?
""",
(normalized, session_digest),
).fetchone()
return dict(row) if row else None
def redeem_gift_card(store: Any, session_digest: str, claim_code: str) -> dict[str, Any]:
normalized = unicodedata.normalize("NFKC", claim_code).strip().upper()
if _SAFE_CODE.fullmatch(normalized) is None:
raise SpecialtyValidationError(
"claim code must use 8 to 32 letters, numbers, or hyphens"
)
fingerprint = hmac.new(
_REDEMPTION_PEPPER, normalized.encode("utf-8"), hashlib.sha256
).hexdigest()
ensure_specialty_schema(store)
store.ensure_session(session_digest)
with store.connect() as connection:
cursor = connection.execute(
"""
INSERT INTO specialty_gift_redemption_attempts(
session_digest,code_fingerprint,status,created_at
) VALUES (?,?,'NOT_APPLIED',?)
""",
(session_digest, fingerprint, store.now(connection)),
)
redemption_id = int(cursor.lastrowid)
connection.commit()
return {"redemption_id": redemption_id, "status": "NOT_APPLIED"}
def gift_card_balance(store: Any, session_digest: str) -> dict[str, int]:
ensure_specialty_schema(store)
store.ensure_session(session_digest)
with store.connect() as connection:
attempts = int(
connection.execute(
"SELECT COUNT(*) FROM specialty_gift_redemption_attempts WHERE session_digest=?",
(session_digest,),
).fetchone()[0]
)
return {"balance_minor": 0, "redemption_attempts": attempts}
def save_seller_draft(
store: Any, session_digest: str, fields: dict[str, str]
) -> dict[str, Any]:
title = _plain_text(
fields.get("title", ""), field="title", minimum=5, maximum=100
)
category = fields.get("category", "")
condition = fields.get("condition", "")
if category not in SELL_CATEGORIES or condition not in SELL_CONDITIONS:
raise SpecialtyValidationError("listing category or condition is invalid")
raw_price = fields.get("price", "")
if _PRICE.fullmatch(raw_price) is None:
raise SpecialtyValidationError("price must be between $1.00 and $5,000.00")
try:
price_minor = int(Decimal(raw_price) * 100)
except (InvalidOperation, ValueError):
raise SpecialtyValidationError("price is invalid") from None
if not 100 <= price_minor <= 500_000:
raise SpecialtyValidationError("price must be between $1.00 and $5,000.00")
raw_quantity = fields.get("quantity", "")
if re.fullmatch(r"(?:[1-9]|[12][0-9]|30)", raw_quantity) is None:
raise SpecialtyValidationError("quantity must be 1 through 30")
description = _optional_text(
fields.get("description", ""), field="description", maximum=500
)
ensure_specialty_schema(store)
store.ensure_session(session_digest)
with store.connect() as connection:
now = store.now(connection)
cursor = connection.execute(
"""
INSERT INTO specialty_seller_drafts(
session_digest,title,category,item_condition,price_minor,quantity,
description,status,created_at,updated_at
) VALUES (?,?,?,?,?,?,?,'LOCAL_DRAFT',?,?)
""",
(
session_digest,
title,
category,
condition,
price_minor,
int(raw_quantity),
description,
now,
now,
),
)
draft_id = int(cursor.lastrowid)
connection.commit()
return seller_draft(store, session_digest, draft_id) or {}
def seller_draft(
store: Any, session_digest: str, draft_id: int | str
) -> dict[str, Any] | None:
normalized = _positive_id(draft_id)
if normalized is None:
return None
ensure_specialty_schema(store)
store.ensure_session(session_digest)
with store.connect() as connection:
row = connection.execute(
"""
SELECT draft_id,title,category,item_condition,price_minor,quantity,
description,status,created_at,updated_at
FROM specialty_seller_drafts
WHERE draft_id=? AND session_digest=?
""",
(normalized, session_digest),
).fetchone()
return dict(row) if row else None
def seller_drafts(store: Any, session_digest: str) -> list[dict[str, Any]]:
ensure_specialty_schema(store)
store.ensure_session(session_digest)
with store.connect() as connection:
rows = connection.execute(
"""
SELECT draft_id,title,category,item_condition,price_minor,quantity,
description,status,created_at,updated_at
FROM specialty_seller_drafts WHERE session_digest=?
ORDER BY draft_id DESC LIMIT 12
""",
(session_digest,),
).fetchall()
return [dict(row) for row in rows]
def _validated_event_date(value: str) -> str:
raw = value.strip()
if not raw:
return ""
if re.fullmatch(r"[0-9]{4}-[0-9]{2}-[0-9]{2}", raw) is None:
raise SpecialtyValidationError("event date is invalid")
try:
parsed = date.fromisoformat(raw)
except ValueError:
raise SpecialtyValidationError("event date is invalid") from None
if not 2000 <= parsed.year <= 2100:
raise SpecialtyValidationError("event date is invalid")
return raw
def create_registry(
store: Any, session_digest: str, fields: dict[str, str]
) -> dict[str, Any]:
registry_type = fields.get("registryType", "")
if registry_type not in REGISTRY_TYPES:
raise SpecialtyValidationError("registry type is invalid")
owner_name = _plain_text(
fields.get("ownerName", ""), field="owner name", minimum=2, maximum=80
)
registry_name = _plain_text(
fields.get("registryName", ""),
field="registry name",
minimum=3,
maximum=100,
)
event_date = _validated_event_date(fields.get("eventDate", ""))
ensure_specialty_schema(store)
store.ensure_session(session_digest)
with store.connect() as connection:
cursor = connection.execute(
"""
INSERT INTO specialty_registries(
session_digest,registry_type,owner_name,registry_name,event_date,
status,created_at
) VALUES (?,?,?,?,?,'LOCAL_PRIVATE_DRAFT',?)
""",
(
session_digest,
registry_type,
owner_name,
registry_name,
event_date,
store.now(connection),
),
)
registry_id = int(cursor.lastrowid)
connection.commit()
return registry(store, session_digest, registry_id) or {}
def registry(
store: Any, session_digest: str, registry_id: int | str
) -> dict[str, Any] | None:
normalized = _positive_id(registry_id)
if normalized is None:
return None
ensure_specialty_schema(store)
store.ensure_session(session_digest)
with store.connect() as connection:
row = connection.execute(
"""
SELECT registry_id,registry_type,owner_name,registry_name,event_date,
status,created_at
FROM specialty_registries
WHERE registry_id=? AND session_digest=?
""",
(normalized, session_digest),
).fetchone()
return dict(row) if row else None
def registries(store: Any, session_digest: str) -> list[dict[str, Any]]:
ensure_specialty_schema(store)
store.ensure_session(session_digest)
with store.connect() as connection:
rows = connection.execute(
"""
SELECT registry_id,registry_type,owner_name,registry_name,event_date,
status,created_at
FROM specialty_registries WHERE session_digest=?
ORDER BY registry_id DESC LIMIT 12
""",
(session_digest,),
).fetchall()
return [dict(row) for row in rows]
_DEMO_REGISTRIES = (
{
"demo_id": "demo-welcome",
"registry_type": "gift",
"owner_name": "Amazon Clone Demo",
"registry_name": "Welcome Home Picks",
"event_date": "",
"status": "LOCAL_DEMO",
},
{
"demo_id": "demo-reading",
"registry_type": "gift",
"owner_name": "Amazon Clone Demo",
"registry_name": "A Reader's Shelf",
"event_date": "",
"status": "LOCAL_DEMO",
},
)
def search_registries(
store: Any, session_digest: str, query: str
) -> tuple[str, list[dict[str, Any]]]:
normalized = _plain_text(
query, field="registry search", minimum=2, maximum=60
)
needle = normalized.casefold()
own = [
{**item, "is_own": True}
for item in registries(store, session_digest)
if needle in f"{item['owner_name']} {item['registry_name']}".casefold()
]
demos = [
{**item, "is_own": False}
for item in _DEMO_REGISTRIES
if needle in f"{item['owner_name']} {item['registry_name']}".casefold()
]
return normalized, own + demos
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