feat(miner-extension): reject oversized pasted ranked-candidates JSON before saving

[joaovictor712]

Summary

• The miner extension accepted an arbitrarily large pasted JSON blob into the options page's ranked-candidates
  textarea with no size bound at all. The extension does not request the unlimitedStorage permission, so
  chrome.storage.local is capped at its default ~10 MiB QUOTA_BYTES quota shared across every key — an
  oversized paste could silently fail to save (Chrome rejects the set() call) or leave storage in a partial
  state, with no clear feedback to the contributor about why.
• options.js's parseRankedCandidatesJson now checks the raw pasted text's length against a new
  MAX_RANKED_CANDIDATES_JSON_CHARS bound (8 MiB of UTF-16 characters) before attempting JSON.parse — so
  an oversized-but-invalid paste fails with a clear "too large" error rather than a confusing JSON syntax error,
  and a valid-but-oversized paste never reaches chrome.storage.local.set at all.
• The bound is checked against text.length (UTF-16 code units), not a TextEncoder-based byte count: this
  content script ships unbundled (no build step), and TextEncoder also isn't available in this repo's
  node:vm-based unit-test harness for these scripts, so a plain length check keeps the logic portable and
  directly testable. 8 MiB of characters stays comfortably under the 10 MiB quota even accounting for multi-byte
  UTF-8 expansion once actually persisted.

Fixes #4863

Scope

• The PR title follows type(scope): short summary Conventional Commit format, for example fix(api): restore profile access checks.
• This PR is focused and does not mix unrelated backend, UI, MCP, docs, dependency, and deploy changes.
• This follows CONTRIBUTING.md and does not reintroduce GitHub Pages, VitePress, site/, or CNAME.
• I linked a currently open issue this PR resolves (e.g. Closes #123) — a linked open issue is required for every contributor PR.

Validation

• git diff --check
• npm run actionlint
• npm run typecheck
• npm run test:coverage locally — this change lives entirely under apps/gittensory-miner-extension/** and its dedicated test file test/unit/miner-extension-content.test.ts, outside vitest's root coverage.include glob (only root src/** is Codecov-measured), so codecov/patch cannot see this diff.
• npm run test:workers
• npm run build:mcp
• npm run test:mcp-pack
• npm run ui:openapi:check
• npm run ui:lint
• npm run ui:typecheck
• npm run ui:build
• npm audit --audit-level=moderate
• New or changed behavior has unit/integration tests for new branches, fallback paths, and sanitizer boundaries

Ran the full local gate: npm run test:ci (798 test files, 0 failures) and npm audit --audit-level=moderate (0 vulnerabilities), both clean on the final rebased commit.

Test coverage added to test/unit/miner-extension-content.test.ts (now 21 tests total, up from 18): rejecting a payload one character over the bound with a clear "too large" error, and specifically asserting the size check fires before JSON.parse runs (proven with a non-JSON oversized string, checking the thrown error is not a JSON syntax error); accepting a payload of exactly the boundary length (MAX_RANKED_CANDIDATES_JSON_CHARS chars, not one over); and a regression test driving the real form-submit save flow end-to-end with an oversized paste, asserting the error surfaces through showStatus and chrome.storage.local.set is never called (zero partial writes).

Safety

• No secrets, wallet details, hotkeys, coldkeys, user PATs, private keys, raw trust scores, private rankings, or private maintainer evidence are exposed.
• Public GitHub text stays sanitized, low-noise, and does not imply compensation guarantees or optimization tactics.
• Auth, cookie, CORS, GitHub App, Cloudflare, or session changes include negative-path tests. — N/A, no auth/session/CORS surface touched (local chrome.storage only).
• API/OpenAPI/MCP behavior is updated and tested where needed. — no public API/OpenAPI/MCP surface touched; this only guards a local chrome.storage.local write path.
• UI changes use live API data or real empty/error/loading states, not production mock/demo fallbacks. — the error path is driven through the real parseRankedCandidatesJson/showStatus code, not a mock of the validation itself.
• Visible UI changes include a UI Evidence section below.
• Public docs/changelogs are updated where needed; changelogs are only edited for release-prep PRs. — updated apps/gittensory-miner-extension/README.md's "Local ranked cache" section.

UI Evidence

This is a browser extension options page — there is no hosted/public deployment to screenshot from this
environment (no browser screenshot tooling available here). Verified functionally instead: npm run test:ci
includes the full test/unit/miner-extension-content.test.ts suite (21/21 passing), including a regression test
that drives the real options-page save flow with an oversized paste and asserts the visible status message
matches /too large/i while chrome.storage.local.set is never invoked.

Notes

• Chose a plain UTF-16 text.length check over TextEncoder-based byte counting to keep this portable across
  the unbundled content-script runtime and the repo's node:vm test harness for these files, at the cost of
  being an approximation rather than an exact byte count — the 8 MiB bound leaves comfortable headroom under the
  10 MiB chrome.storage.local quota to absorb that approximation.
• Did not request the unlimitedStorage permission as an alternative fix; the issue's proposal was a bounded,
  validated paste path with a clear error, not expanding the extension's storage footprint.

[superagent-security]

Superagent didn't find any vulnerabilities or security issues in this PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.79%. Comparing base (05d1fb0) to head (510d361).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5525   +/-   ##
=======================================
  Coverage   94.79%   94.79%           
=======================================
  Files         566      566           
  Lines       45065    45065           
  Branches    14675    14675           
=======================================
  Hits        42718    42718           
  Misses       1613     1613           
  Partials      734      734           

Flag	Coverage Δ
shard-1	43.65% <ø> (-0.56%)	⬇️
shard-2	35.53% <ø> (+0.06%)	⬆️
shard-3	32.11% <ø> (+0.16%)	⬆️
shard-4	31.35% <ø> (-0.58%)	⬇️
shard-5	33.32% <ø> (+0.45%)	⬆️
shard-6	43.72% <ø> (+0.20%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

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[loopover-orb]

Caution

🟥🟥🟥🟥🟥🟥🟥🟥🟥🟥🟥🟥

🛑 Gittensory review result - reject/close recommended

_{Review updated: 2026-07-13 01:22:34 UTC}

3 files · 2 AI reviewers · 1 blocker · readiness 100/100 · CI green · clean

🛑 Suggested Action - Reject/Close

Review summary
This PR adds a straightforward pre-parse size guard (`trimmed.length > MAX_RANKED_CANDIDATES_JSON_CHARS`, 8 MiB of UTF-16 chars) in `parseRankedCandidatesJson` in options.js:12-16, throwing a clear error before `JSON.parse` and before `chrome.storage.local.set` is ever reached. The change is correctly scoped, closes #4863, and is well-tested: an over-limit non-JSON payload, an at-limit valid payload, and a full submit-flow regression test confirming `chrome.storage.local.set` is never called on an oversized paste. The UTF-16-length-vs-byte-size tradeoff is explicitly documented and justified (no build step, no TextEncoder in the node:vm test harness), which is a reasonable engineering call for this unbundled content script.

Blockers

• apps/gittensory-miner-extension/options.js:17 accepts any JSON whose trimmed UTF-16 length is <= 8 MiB, so a valid array containing multibyte characters can pass `parseRankedCandidatesJson()` and still exceed `chrome.storage.local` quota at `chrome.storage.local.set`, recreating the silent/partial save failure this PR is meant to close; change the guard to measure the serialized byte size with a portable fallback or lower the bound to account for worst-case UTF-8 expansion and add a real-path test for non-ASCII input.

Nits — 5 non-blocking

• The 8 MiB UTF-16-character bound is a proxy for byte size, not an exact one — once JSON-stringified with escaping/serialization overhead plus the `rankedCandidatesSavedAt` key, a payload right at the 8 MiB boundary could still occasionally exceed the 10 MiB quota depending on multi-byte content; worth a comment confirming this was considered acceptable headroom (already partially done in the code comment).
• Consider surfacing the character count of a rejected paste truncated in the UI (already done via toLocaleString in the error message) so contributors know how far over they are — this is already handled well.
• No other changes needed; the diff is narrow and directly maps to the linked issue.
• test/unit/miner-extension-content.test.ts:158 calls `parseRankedCandidatesJson(oversized)` twice in the same test; nit: capture the thrown error once so the invariant is clearer and the test does not duplicate the expensive oversized parse path.
• apps/gittensory-miner-extension/options.js:17 either use a small local UTF-8 byte counter instead of raw `trimmed.length`, or set the character bound low enough that worst-case persisted JSON remains below Chrome's quota.

Why this is blocked

• apps/gittensory-miner-extension/options.js:17 accepts any JSON whose trimmed UTF-16 length is <= 8 MiB, so a valid array containing multibyte characters can pass `parseRankedCandidatesJson()` and still exceed `chrome.storage.local` quota at `chrome.storage.local.set`, recreating the silent/partial save failure this PR is meant to close; change the guard to measure the serialized byte size with a portable fallback or lower the bound to account for worst-case UTF-8 expansion and add a real-path test for non-ASCII input.

📋 Copy for AI agents — paste into your coding agent

Fix the following blocker(s) from this PR review:

1. apps/gittensory-miner-extension/options.js:17 accepts any JSON whose trimmed UTF-16 length is <= 8 MiB, so a valid array containing multibyte characters can pass \`parseRankedCandidatesJson\(\)\` and still exceed \`chrome.storage.local\` quota at \`chrome.storage.local.set\`, recreating the silent/partial save failure this PR is meant to close; change the guard to measure the serialized byte size with a portable fallback or lower the bound to account for worst-case UTF-8 expansion and add a real-path test for non-ASCII input.

Signal	Result	Evidence
Code review	❌ 1 blocker	2 reviewers, synthesized
Linked issue	✅ Linked	#4863
Related work	✅ No active overlap found	No same-issue or scoped active PR overlap found.
Change scope	✅ 20/20	Low review scope from cached public metadata (1 linked issue).
Validation posture	✅ 25/25	PR body includes validation/test evidence.
Contributor workload	✅ 10/10	Author activity: 1874 registered-repo PR(s), 1235 merged, 49 issue(s).
Contributor context	✅ Confirmed Gittensor contributor	galuis116; Gittensor profile; 1874 PR(s), 49 issue(s).
Gate result	❌ Blocking	Repo-configured hard blocker found.
Improvement	✅ Minor	risk: clean · value: minor — Code changes are accompanied by test evidence. LLM value judgment: minor — This is a small, well-targeted defensive fix closing a real storage-quota footgun for a niche extension feature, not a major functional improvement.

Linked issue satisfaction

Addressed
The PR adds a size check on the pasted ranked-candidates JSON before parsing/saving, throwing a clear 'too large' error and preventing storage.set from being called on oversized input, directly matching the issue's ask for bounded paste validation with a clear error message.

Review context

• Author: galuis116
• Role context: outside_contributor
• Public audience mode: oss maintainer
• Lane context: Repository is configured for direct PR review.
• Public profile languages: JavaScript, Python, Dart, TypeScript, HTML, MDX, Rust, C++
• Official Gittensor activity: 1874 PR(s), 49 issue(s).
• PR-specific overlap: none found.

Contributor next steps

• Keep the PR focused and include validation evidence before maintainer review.

Signal definitions

• Related work = same linked issue, overlapping active PRs, or title/path similarity.
• Change scope = cached public metadata such as size labels, draft state, and review-burden hints.
• Validation posture = whether the PR provides enough public validation/test evidence for maintainer review.
• Contributor workload = public contributor activity and cleanup pressure, not a repo-wide quality failure.
• Contributor context = public GitHub/Gittensor identity context; non-Gittensor status is not a blocker.

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Visual preview

Route	Viewport	Before (production)	After (this PR's preview)	Diff
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_{🟩 Safe / merged · 🟦 Advisory · 🟨 Held for review · 🟥 Blocked / closed}

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[loopover-orb]

Gittensory is closing this pull request on the maintainer's behalf (AI reviewers agree on a likely critical defect: apps/gittensory-miner-extension/options.js:17 accepts any JSON whose trimmed UTF-16 length is <= 8 MiB, so a valid array containing multibyte characters can pass `parseRankedCandidatesJson()` and still exceed `chrome.storage.local` quota at `chrome.storage.local.set`, recreating the silent/partial save failure this PR is meant to close; change the guard to measure the serialized byte size with a portable fallback or lower the bound to account for worst-case UTF-8 expansion and add a real-path test for non-ASCII input.). This is an automated maintenance action — to pursue this change, please open a new pull request with the issues resolved. Closed PRs may be analyzed later to improve review accuracy, but they are not automatically reopened or re-reviewed.