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"""Endpoint to return additional bids in the appropriate response header.
Additional bids are returned using the "Ad-Auction-Additional-Bid" response
header, as described at
https://github.com/WICG/turtledove/blob/main/FLEDGE.md#63-http-response-headers.
This script generates one of "Ad-Auction-Additional-Bid" response header for
each additional bid provided in a url-encoded `additionalBids` query parameter.
All requests to this endpoint requires a "Sec-Ad-Auction-Fetch" request header
with a value of b"?1"; this entrypoint otherwise returns a 400 response.
"""
import json
import base64
import fledge.tentative.resources.fledge_http_server_util as fledge_http_server_util
class BadRequestError(Exception):
pass
def main(request, response):
try:
if fledge_http_server_util.handle_cors_headers_and_preflight(request, response):
return
# Verify that Sec-Ad-Auction-Fetch is present
if (request.headers.get("Sec-Ad-Auction-Fetch", default=b"").decode("utf-8") != "?1"):
raise BadRequestError("Sec-Ad-Auction-Fetch missing or unexpected value; expected '?1'")
# Return each signed additional bid in its own header
additional_bids = request.GET.get(b"additionalBids", default=b"").decode("utf-8")
if not additional_bids:
raise BadRequestError("Missing 'additionalBids' parameter")
for additional_bid in json.loads(additional_bids):
additional_bid_string = json.dumps(additional_bid)
auction_nonce = additional_bid.get("auctionNonce", None)
if not auction_nonce:
raise BadRequestError("Additional bid missing required 'auctionNonce' field")
signed_additional_bid = json.dumps({
"bid": additional_bid_string,
"signatures": []
})
additional_bid_header_value = (auction_nonce.encode("utf-8") + b":" +
base64.b64encode(signed_additional_bid.encode("utf-8")))
response.headers.append(b"Ad-Auction-Additional-Bid", additional_bid_header_value)
response.status = (200, b"OK")
response.headers.set(b"Content-Type", b"text/plain")
except BadRequestError as error:
response.status = (400, b"Bad Request")
response.headers.set(b"Content-Type", b"text/plain")
response.content = str(error)
except Exception as exception:
response.status = (500, b"Internal Server Error")
response.content = str(exception)
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