fledge/tentative/resources/bidding-logic.sub.py

from pathlib import Path

from fledge.tentative.resources import fledge_http_server_util

# General bidding logic script. Depending on query parameters, it can
# simulate a variety of network errors, and its generateBid(), reportWin(),
# and reportAdditionalBidWin() functions can have arbitrary Javascript code
# injected in them. generateBid() will by default return a bid of 9 for the
# first ad.
def main(request, response):
  if fledge_http_server_util.handle_cors_headers_and_preflight(request, response):
    return

  error = request.GET.first(b"error", None)

  if error == b"close-connection":
      # Close connection without writing anything, to simulate a network
      # error. The write call is needed to avoid writing the default headers.
      response.writer.write("")
      response.close_connection = True
      return

  if error == b"http-error":
      response.status = (404, b"OK")
  else:
      response.status = (200, b"OK")

  if error == b"wrong-content-type":
      response.headers.set(b"Content-Type", b"application/json")
  elif error != b"no-content-type":
      response.headers.set(b"Content-Type", b"application/javascript")

  if error == b"bad-allow-fledge":
      response.headers.set(b"Ad-Auction-Allowed", b"sometimes")
  elif error == b"fledge-not-allowed":
      response.headers.set(b"Ad-Auction-Allowed", b"false")
  elif error != b"no-allow-fledge":
      response.headers.set(b"Ad-Auction-Allowed", b"true")

  if error == b"no-body":
      return b''

  body = (Path(__file__).parent.resolve() / 'worklet-helpers.js').read_text().encode("ASCII")
  if error != b"no-generateBid":
      # Use bid query param if present. Otherwise, use a bid of 9.
      bid = (request.GET.first(b"bid", None) or b"9").decode("ASCII")

      bidCurrency = ""
      bidCurrencyParam = request.GET.first(b"bidCurrency", None)
      if bidCurrencyParam != None:
          bidCurrency = "bidCurrency: '" + bidCurrencyParam.decode("ASCII") + "',"

      allowComponentAuction = ""
      allowComponentAuctionParam = request.GET.first(b"allowComponentAuction", None)
      if allowComponentAuctionParam != None:
          allowComponentAuction = f"allowComponentAuction: {allowComponentAuctionParam.decode('ASCII')},"

      body += f"""
          function generateBid(interestGroup, auctionSignals, perBuyerSignals,
                              trustedBiddingSignals, browserSignals,
                              directFromSellerSignals,
                              crossOriginTrustedBiddingSignals) {{
            {{{{GET[generateBid]}}}};
            return {{
              bid: {bid},
              {bidCurrency}
              {allowComponentAuction}
              render: interestGroup.ads[0].renderURL
            }};
          }}""".encode()
  if error != b"no-reportWin":
      body += b"""
          function reportWin(auctionSignals, perBuyerSignals, sellerSignals,
                            browserSignals, directFromSellerSignals) {
            {{GET[reportWin]}};
          }"""
  if error != b"no-reportAdditionalBidWin":
    body += b"""
        function reportAdditionalBidWin(auctionSignals, perBuyerSignals,
                                        sellerSignals, browserSignals,
                                        directFromSellerSignals) {
          {{GET[reportAdditionalBidWin]}};
        }"""
  return body