File size: 6,946 Bytes
584ed90 | 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 | from __future__ import annotations
import json
from pathlib import Path
from typing import Any, Mapping
from urllib.parse import urlparse
HOME_COMMERCE_FIXTURE = "home-commerce-complete-2026-07-25.json"
HOME_COMMERCE_EVIDENCE_CLASSES = frozenset(
{
"direct-home-commerce",
"regional-converted-home-commerce",
"local-simulation-home-commerce",
}
)
class HomeCommerceError(ValueError):
pass
def load_home_commerce_offers(
fixture_root: Path,
home_catalog: Mapping[str, Mapping[str, Any]],
) -> tuple[dict[str, Any], ...]:
"""Load dated default offers without widening their evidence boundary."""
fixture_root = fixture_root.resolve()
candidate = (fixture_root / HOME_COMMERCE_FIXTURE).resolve()
if fixture_root not in candidate.parents or not candidate.is_file():
raise HomeCommerceError("home commerce fixture does not exist")
try:
payload = json.loads(candidate.read_text(encoding="utf-8"))
except (OSError, json.JSONDecodeError) as exc:
raise HomeCommerceError("home commerce fixture is invalid") from exc
if payload.get("schema") != "amazon-clone.home-commerce-offers.v2":
raise HomeCommerceError("unsupported home commerce fixture schema")
offers = payload.get("offers")
if not isinstance(offers, list) or not offers:
raise HomeCommerceError("home commerce offers must be a non-empty array")
if payload.get("sourceHomepageProducts") != 157:
raise HomeCommerceError("home commerce fixture has an invalid source denominator")
if payload.get("sourceOfferCount") != len(offers):
raise HomeCommerceError("home commerce fixture offer count is inconsistent")
if len(offers) != 157:
raise HomeCommerceError("home commerce fixture must cover all homepage products")
expected_counts = payload.get("evidenceClassCounts")
if not isinstance(expected_counts, dict):
raise HomeCommerceError("home commerce evidence counts are missing")
normalized: list[dict[str, Any]] = []
seen: set[str] = set()
for offer in offers:
if not isinstance(offer, dict):
raise HomeCommerceError("home commerce offers must be objects")
asin = offer.get("asin")
home_product = home_catalog.get(str(asin))
title = offer.get("title")
price_minor = offer.get("price_minor")
currency = offer.get("currency")
source_url = offer.get("source_url")
evidence_class = offer.get("evidence_class")
if (
not isinstance(asin, str)
or len(asin) != 10
or asin in seen
or home_product is None
):
raise HomeCommerceError("home commerce offer has an invalid ASIN")
if not isinstance(title, str) or not title.strip():
raise HomeCommerceError(f"home commerce offer {asin} has no title")
if (
isinstance(price_minor, bool)
or not isinstance(price_minor, int)
or price_minor <= 0
or currency != "USD"
):
raise HomeCommerceError(f"home commerce offer {asin} has an invalid price")
if evidence_class not in HOME_COMMERCE_EVIDENCE_CLASSES:
raise HomeCommerceError(
f"home commerce offer {asin} has an invalid evidence class"
)
if not isinstance(source_url, str):
raise HomeCommerceError(f"home commerce offer {asin} has an invalid source URL")
parsed_source = urlparse(source_url)
if (
parsed_source.scheme != "https"
or parsed_source.hostname not in {"www.amazon.com", "www.amazon.sg"}
or asin not in parsed_source.path
):
raise HomeCommerceError(f"home commerce offer {asin} has an invalid source URL")
if evidence_class == "regional-converted-home-commerce":
source_price_minor = offer.get("source_price_minor")
if (
parsed_source.hostname != "www.amazon.sg"
or isinstance(source_price_minor, bool)
or not isinstance(source_price_minor, int)
or source_price_minor <= 0
or offer.get("source_currency") != "SGD"
or not offer.get("conversion_rate_source")
):
raise HomeCommerceError(
f"regional home commerce offer {asin} is incomplete"
)
if evidence_class == "local-simulation-home-commerce" and not offer.get(
"simulation_disclosure"
):
raise HomeCommerceError(
f"local simulation home commerce offer {asin} is undisclosed"
)
if not (
offer.get("local_add_to_cart_enabled")
and offer.get("local_buy_now_enabled")
):
raise HomeCommerceError(
f"home commerce offer {asin} has incomplete local purchase controls"
)
image_path = home_product.get("image_path")
if not isinstance(image_path, str) or not image_path.startswith("/static/"):
raise HomeCommerceError(f"home commerce offer {asin} has no local image")
seen.add(asin)
normalized.append(
{
"asin": asin,
"slug": "home-offer",
"canonical_path": f"/dp/{asin}",
"title": title,
"brand": "",
"capacity": "",
"color": "",
"price_minor": price_minor,
"list_price_minor": None,
"currency": "USD",
"rating": "",
"reviews": 0,
"image_path": image_path,
"badge": "",
"evidence_class": evidence_class,
"offer_observation_source": str(
offer.get("price_observation_source") or ""
),
"purchase_state": str(offer.get("purchase_state") or ""),
"source_capture": str(offer.get("source_capture") or ""),
"source_url": source_url,
"offer_disclosure": (
"Direct USD offer captured from the product's Amazon purchase surface."
if evidence_class == "direct-home-commerce"
else "USD quote converted from a dated Amazon regional offer."
if evidence_class == "regional-converted-home-commerce"
else "Offline-only local simulation quote."
),
}
)
observed_counts = {
evidence_class: sum(
offer["evidence_class"] == evidence_class for offer in normalized
)
for evidence_class in HOME_COMMERCE_EVIDENCE_CLASSES
}
if observed_counts != expected_counts:
raise HomeCommerceError("home commerce evidence counts are inconsistent")
return tuple(normalized)
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