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refactor(domain): consolidate Feed aggregate invariants in domain/feed.ts

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Gather the feed's scattered business rules — expiry, sender allow/block policy,
and the email byte-size budget — into one framework-agnostic module. Expiry was
duplicated across feed-service, email-processor and the rss/atom/entries routes;
the sender policy and trim loop lived inline in email-processor. Each now calls
a single function (isExpired, applySenderPolicy, trimToByteBudget,
resolveExpiresAt). Drops the now-unused MAX_METADATA_EMAILS constant.

Behaviour-preserving; adds feed.test.ts covering every invariant.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
Julien Herr
2026-05-23 23:59:15 +02:00
parent 2b3f00f7e3
commit 6b51173722
8 changed files with 250 additions and 114 deletions
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src/config/constants.ts
-3
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@@ -16,9 +16,6 @@ export const ADMIN_COOKIE_MAX_AGE = 60 * 60 * 24 * 7; // 1 week
/** Maximum number of feed items exposed in RSS/Atom responses. */
export const MAX_FEED_ITEMS = 20;
/** Maximum number of email entries kept in feed metadata. */
export const MAX_METADATA_EMAILS = 50;
/** Default WebSub lease duration (seconds). */
export const DEFAULT_LEASE_SECONDS = 86400; // 24 hours