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# These functions are used by FLEDGE to determine the logic for the ad seller.
# For our testing purposes, we only need the minimal amount of boilerplate
# code in place to allow them to be invoked properly and move the FLEDGE
# process along. The tests do not deal with reporting results, so we leave
# `reportResult` empty. See `generateURNFromFledge` in "utils.js" to see how
# this file is used.
from wptserve.utils import isomorphic_decode
def main(request, response):
# Set up response headers.
headers = [
('Content-Type', 'Application/Javascript'),
('Ad-Auction-Allowed', 'true')
]
# Parse URL params.
requested_size = request.GET.first(b"requested-size", None)
# Use URL params to modify Javascript.
requested_size_check = ''
if requested_size is not None:
# request.GET stores URL keys and values in iso-8859-1 binary encoding. We
# have to decode the values back to a string to parse width/height. Don't
# bother sanitizing the size, because it is sanitized before auction logic
# runs already.
width, height = isomorphic_decode(requested_size).split('-')
requested_size_check = (
f'''
if (!(auctionConfig.requestedSize.width === '{width}') &&
(auctionConfig.requestedSize.height === '{height}')) {{
throw new Error('requestedSize missing/incorrect in auctionConfig');
}}
'''
)
# Generate Javascript.
# Note: Python fstrings use double-brackets ( {{, }} ) to insert bracket
# literals instead of substitution sequences.
score_ad = (
f'''function scoreAd(
adMetadata,
bid,
auctionConfig,
trustedScoringSignals,
browserSignals) {{
{requested_size_check}
return 2*bid;
}}
'''
)
report_result = (
f'''function reportResult(
auctionConfig,
browserSignals) {{
{requested_size_check}
return;
}}
'''
)
content = f'{score_ad}\n{report_result}'
return (headers, content)
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