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[Spec] Add private aggregation support for B&A response #1344

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@qingxinwu qingxinwu commented Nov 22, 2024

Client side support of private aggregation reports for auctions run on bidding and auction service.
Also fix a bug that non-reserved events should be ignored for seller scripts.


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@qingxinwu qingxinwu added the spec Relates to the spec label Nov 22, 2024
@qingxinwu qingxinwu requested a review from morlovich December 11, 2024 20:33
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IETF spec that handles paggResponse field: privacysandbox/draft-ietf-bidding-and-auction-services#15

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@morlovich Mind taking a look? Thanks!

get batching scope steps</a>.

Note: Each non-reserved |event| will have a different [=batching scope=]
that is created later.
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this is copied from on-device PAgg part. I don't see a place that creates the batching scope for non-reserved events, IIUC

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I think it may be because those are sent, well, on event?

@@ -6042,6 +6135,8 @@ event, PAExtendedHistogramContribution contribution)</dfn> method steps are:
reserved event types are added later.
1. If |event| is "`reserved.once`" and |function| is [=worklet function/report-result=] or
[=worklet function/report-win=], [=exception/throw=] a {{TypeError}}.
1. If |event| does not [=string/start with=] "`reserved.`", and |function| is "`scoreAd()`" or
"`report-result`", return.
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I do not understand this change.


<div algorithm>
To <dfn>commit server response private aggregation contributions</dfn> given a
[=server auction response=] |contributionsMap|, a [=reporting context=] |reportingContext|, a
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I don't think server auction response is the right type here?

1. Return the result of running [=get or create a batching scope=] given |reportingOrigin|,
|coordinator| and |reportingContext|.
: <a spec="private-aggregation-api" for="scoping details">get debug scope steps</a>
:: An algorithm that returns a new [=debug scope=].
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So technically you don't need a |scopingDetails| here since you're not integrating with contributeToHistogram[OnEvent], though it might be worthwhile for consistency?

get batching scope steps</a>.

Note: Each non-reserved |event| will have a different [=batching scope=]
that is created later.
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I think it may be because those are sent, well, on event?

1. [=list/For each=] |contribution| of |contributions|:
1. Let |entry| be a new [=on event contribution entry=] with the items:
: [=on event contribution entry/contribution=]
:: |contribution|
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It would be nice to have some sort of an assert here that it doesn't have any baseValues?

:: |reportingOrigin|
1. If |eventToContributionsMap|[|event|] does not [=map/exist=], set
|eventToContributionsMap|[|event|] to « |entry| ».
1. Otherwise, [=list/append=] |eventToContributionsMap|[|event|] with |entry|.
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....append ... with ... is kinda strange. Append |entry| to ... ?

1. If |event| does not [=string/start with=] "`reserved.`":
1. [=list/For each=] |onEventEntry| of |contributions|:
1. If |onEventEntry|'s [=on event contribution entry/server filtered=] is false and |bidId| is
not |winnerId|, then [=list/remove=] |onEventEntry| from |contributions|.
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I think I would prefer if you checked it inside the existing loop over contributions, and just used continue as everything else, rather than have a different pre-filtering loop.

1. [=list/For each=] |onEventEntry| of |contributions|:
1. If |onEventEntry|'s [=on event contribution entry/server filtered=] is false and |bidId| is
not |winnerId|, then [=list/remove=] |onEventEntry| from |contributions|.
1. If |onEventEntry|'s [=on event contribution entry/server filtered=] is false:
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...and you don't even have onEventEntry at this level? I think you probably just want to move the reserved.win/reserved.loss check into the "For each onEventEntry of contributions :" loop, since now it needs to check the server filtered bit.... except shouldn't things that are server-filtered only be using reserved.always anyway?

...I am not sure you actually need the server-filtered bid if the part about them always having reserved.always are true.

(The way losing components is supposed to be handled is by not having a winnerId be set on them).

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