Read the page param in product listing loaders

[theluckystrike]

Fixes #62.

The pagination links on /products, /categories/:handle and /collections/:handle point to ?page=N, but none of the three loaders read that param. Every page asked Medusa for the default first 50 products, so page 2 and later showed the same products as page 1, and the pagination control stayed on page 1 because it derives the current page from offset / limit.

Changes

• libs/util/server/products.server.ts gets a small getProductsPaginationParams(request) helper. It reads page from the request URL and returns { limit, offset }. The limit is 50, the store API default, so the page size doesn't change.
• Missing, zero, negative or non-numeric page values fall back to the first page.
• The products, category and collection loaders pass those params to fetchProducts. The cache key already includes the query, so each page gets its own cache entry.

Testing

• yarn typecheck in apps/storefront passes. biome check on the 4 changed files is clean.
• I ran the helper against sample URLs. /products and ?page=1 give offset 0, ?page=2 gives offset 50, ?page=3&sort=x gives offset 100, and ?page=0, ?page=-4 and ?page=abc give offset 0. In each case Math.floor(offset / limit) + 1, the formula Pagination.tsx uses, gives back the requested page.
• I didn't click through a seeded store with more than 50 products, so a quick look on a real catalog is still worth it.

Summary by CodeRabbit

• New Features
  • Product listings now support page-based browsing across category, collection, and all-products pages, showing up to 50 products per page.

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Walkthrough

Storefront product, category, and collection loaders now derive pagination parameters from the request and pass them to fetchProducts. A shared helper parses the page query parameter and defaults the page size to 50.

Changes

Storefront pagination

Layer / File(s)	Summary
Pagination parameter helper apps/storefront/libs/util/server/products.server.ts	Adds a default page size of 50. The helper parses the page parameter and calculates an offset for integer page values greater than 1.
Route pagination wiring apps/storefront/app/routes/products._index.tsx, apps/storefront/app/routes/categories.$categoryHandle.tsx, apps/storefront/app/routes/collections.$collectionHandle.tsx	Each loader passes request-derived pagination parameters to fetchProducts.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: 🔵 Low · up to a2688

A malformed page URL can show a later product page, but the issue is limited to invalid page values. The change is otherwise ready with this bounded follow-up.

Security Architecture Review

Security architecture risk: 🔵 Low · up to a2688

Pagination preserves the existing category, collection, and region selection behavior without adding privileges. Arbitrary page values can create cache misses and eviction pressure, but cached entries are bounded. Backend resource limits and concurrent cache-fill behavior remain unverified.

Retained concerns

• Low · security · inferred: Public page values now select arbitrarily many distinct product-cache keys, allowing repeated cold fills and eviction pressure on the shared SDK cache. The 1,000-entry capacity bounds retention; backend exhaustion and deployment-wide availability impact remain unverified.

Security review details

Security Blast Radius

• inferred — The supported exposure is request-driven product fetching and pressure on the storefront's shared SDK cache. Evidence does not establish exposure across tenants, environments, or deployed instances.

Security Findings and Attack Paths

• inferred — A caller can vary positive page values to select distinct cache keys and trigger fresh product-list requests. This supports cache-pressure risk, not a verified backend denial of service.

Trust Boundaries and Controls

• observed — Pagination does not replace route-resolved category or collection IDs, and the fetcher continues supplying the selected region. The changed flow adds query selection rather than a new privileged operation.

Resilience and Maintainability Implications

• observed — The shared cache has a 1,000-entry capacity, and product fetching configures a ten-second TTL with one-hour stale-while-revalidate. Concurrent fill, failed-fill cleanup, and exact expiry semantics depend on unavailable dependency implementation evidence.

Hardening Proposals

• proposed — Consider validating safe page and offset arithmetic and aligning accepted pagination ranges with verified backend limits. Evaluate admission controls for out-of-catalogue cache entries without restricting legitimate catalogue navigation.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: reading the page parameter in product listing loaders.
Linked Issues check	✅ Passed	Issue #62 requires the /products loader to pass a limit of 50 and an offset based on the page query parameter. getProductsPaginationParams supplies a limit of 50 and computes the offset for inte…
Out of Scope Changes check	✅ Passed	The category and collection loader changes apply the same pagination fix to routes whose pagination links also use the page parameter. The shared helper and these route updates support the paginatio…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 4…

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Inline comments:
Review comments at @apps/storefront/libs/util/server/products.server.ts:
- Around line 12-13: Update the page parsing and offset calculation to reject
query values that are not complete base-10 integers, so values such as “2abc”
use the first-page offset. Anchor the change in the page and offset logic,
preserving the existing fallback to offset zero and guarding against unsafe
values when calculating the offset.

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📥 Commits

Reviewing files that changed from the base of the PR and between 8d1fdf9 and a26881c.

📒 Files selected for processing (4)

• apps/storefront/app/routes/categories.$categoryHandle.tsx
• apps/storefront/app/routes/collections.$collectionHandle.tsx
• apps/storefront/app/routes/products._index.tsx
• apps/storefront/libs/util/server/products.server.ts

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