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Deliver Join and Leave to the app's inbox instead of an unaddressed outbox post

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A participation activity is now addressed to the Festipod app actor alone and
handled on reception in the app's inbox, the way the ActivityPods developer
advised: use the ActivityPub protocol rather than a side channel. Any
compatible sender may deliver; the inbox accepts only the activity's own
signer, and the backend still requires the activity to lie in that actor's pod
and acts on the stored copy.

The meeting point is read again in its creator's pod before anything is
written: read through the participant's pod, a foreign server's proxy chose
the attendee list and the notification's name.

Confidentiality is unchanged: the Join stays readable by its author and the
app only. Recorded in decision_2026-11-03_participation-delivered-to-the-app,
a named exception to festipod-only-reference-app-patterns.
This commit is contained in:
Sylvain Duchesne
2026-11-03 18:31:24 +01:00
parent ea359488b6
commit 9e2df2478b
20 changed files with 407 additions and 127 deletions
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.project/concepts/data-layer/activitypods-providers/usage_festipod.md
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@@ -8,7 +8,7 @@ against: 66616484b96fb2227cd8cdf02321aacfb4811365
Festipod is a mobile-first web application: users create **meeting points** grafted onto public events, and sign up to them. Its entire persistence goes through Refine, behind a **backend seam** that exists so the app can support several Refine backends and let the user switch between them at runtime. This package is one of the two backends targeted; the other is a Refine provider over NextGraph plus its polyfill. The seam's own contract — what a backend must answer before it can be added — lives in code, in `src/shared/refine/providers/types.ts`.
The seam is wired since 2026-10-09 (T04.e): this backend is the registered default, and Festipod reads and writes through it — `useList` over the shared `as:Event` container (split into events and meeting points by the bindings' `isInstance`), creates and updates through the data provider, and the embedded `apods:attendees` collection through the participation binding's `membersOf`. Joins/leaves are the one write beside Refine (the package implements no `custom`): an `as:Join`/`as:Leave` posted to the user's own outbox by `src/shared/data/outbox.ts`, naming the meeting point with no addressee, so that only its author and the app can read it. What the list below declares is therefore measured where a runtime check exists and declared elsewhere; `against:` names the observation's commit, and the package publishes no engagement, so there is nothing to pull and nothing that can drift — what is recorded here is read against our own reconstruction, and re-read when it is re-stamped.
The seam is wired since 2026-10-09 (T04.e): this backend is the registered default, and Festipod reads and writes through it — `useList` over the shared `as:Event` container (split into events and meeting points by the bindings' `isInstance`), creates and updates through the data provider, and the embedded `apods:attendees` collection through the participation binding's `membersOf`. Joins/leaves are the one write beside Refine (the package implements no `custom`): an `as:Join`/`as:Leave` posted to the user's own outbox by `src/shared/data/outbox.ts`, naming the meeting point and addressed to the Festipod app actor alone, so that only its author and the app can read it; the pod delivers it to the app's inbox. What the list below declares is therefore measured where a runtime check exists and declared elsewhere; `against:` names the observation's commit, and the package publishes no engagement, so there is nothing to pull and nothing that can drift — what is recorded here is read against our own reconstruction, and re-read when it is re-stamped.
## Consumed surface