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