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"""Endpoint to return signed additional bids in the appropriate response header.
Additional bids are returned using the "Ad-Auction-Additional-Bid" response
header, as described at
This script generates an "Ad-Auction-Additional-Bid" response header for each of
the pre-formatted additional bid header values provided in a JSON list-valued
`additionalBidHeaderValues` 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 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_fail_if_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 additional bid in its own header
additional_bid_header_values = request.GET.get(b"additionalBidHeaderValues", default=b"").decode("utf-8")
if not additional_bid_header_values:
raise BadRequestError("Missing 'additionalBidHeaderValues' parameter")
for additional_bid_header_value in json.loads(additional_bid_header_values):
response.headers.append(
b"Ad-Auction-Additional-Bid", additional_bid_header_value.encode("utf-8"))
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)