Make an expired window require re-approval instead of resetting to the global policy

[kwsantiago]

Expiry currently loosens. When an app's settings window lapses, the sweep deletes every permission row for that caller, which takes the user's explicit DENY with it, leaves the per-package auto-signing opt-in intact, and removes the settings row, so isAppExpired then reports false and the app resolves to the global policy. Under a global of Auto or Basic that is silent auto-approval for an app whose window had just closed, and for one the user had explicitly refused. A time box must not end in broader access than it granted.

Expiry now means the app has to be approved again.

• The unfiltered per-caller delete is gone. Permission rows already carry their own expiresAt and durationMs, and deleteExpired in the same transaction already honors them, so each grant and each refusal lives exactly as long as the user asked rather than being tied to the app-settings window. A standing DENY is the user's instruction about that app, not part of the time-boxed grant, so expiry no longer touches it.
• The opt-in is cleared for each expired package, which is what makes re-approval necessary rather than optional. Without it the app keeps its opt-in and the next request is auto-approved by whatever the global happens to be.

The per-app override and the window itself are still retired, as before.

This matters more after the move to keep v0.11.0 (keep-android-td8b). Today an opted-in app under an Auto or Basic policy is auto-approved at the core's sign-policy gate before the expiry gate runs, so it never receives deny_expired and never triggers the sweep. v0.11.0 evaluates expiry, the permission lookup and a standing DENY ahead of the policy, so deny_expired becomes reachable for exactly that population and Nip55ContentProvider fires the sweep for them. The re-pin is blocked on this change for that reason.

cleanupExpired takes the safeguards alongside the sign-policy store, and all three call sites pass it.

Test plan

Added an instrumented test covering the case the old behavior got wrong: an app with a no-expiry DENY and an opted-in auto-signing flag, whose settings window has lapsed, keeps its DENY and loses its opt-in across the sweep.

Checked that nothing pinned the old behavior first. The only existing test of the sweep inserts a permission row with its own past expiresAt and asserts it is removed, which deleteExpired still does independently, so per-row expiry is unaffected.

Summary by CodeRabbit

• Bug Fixes
  • Expired app permissions are now cleaned up without removing explicit deny or ask decisions.
  • Expired app settings are removed only after any sign-policy override is cleared and automatic signing is disabled. If automatic-signing safeguards are unavailable or clearing opt-in fails, the settings are retained.
  • Expired permissions that grant access and associated automatic-signing opt-ins are cleared during cleanup.

Note on the keep pin

At the current pin (keep v0.10.0) the spared DENY is not yet load-bearing: the core evaluates the sign policy before app expiry and before the standing permission, so for an opted-in app under a global of Auto or Basic the DENY is never read, and the in-session sweep trigger in Nip55ContentProvider is dead for that configuration because only the expiry gate emits deny_expired. The cleared opt-in is what carries the fix there. Both resolve on the move to keep v0.11.0, which evaluates expiry, the permission lookup and a standing DENY ahead of the policy, so the pin bump and this change are two halves of the same fix rather than unrelated work.

[coderabbitai]

Walkthrough

Expiry cleanup now preserves DENY and ASK permissions while removing grants. It also clears auto-signing opt-in before deleting expired app settings. App initialization, settings cleanup, and expired-deny rejection handling pass the safeguards to the cleanup method.

Changes

Permission Expiry Cleanup

Layer / File(s)	Summary
Grant and opt-in cleanup primitives app/src/main/kotlin/io/privkey/keep/nip55/PermissionDaos.kt, app/src/main/kotlin/io/privkey/keep/nip55/AutoSigningSafeguards.kt	Adds a DAO operation that removes grants while retaining DENY and ASK rows. Adds clearOptIn, which removes a package's opt-in preference and reports whether the change committed to disk.
Expiry sweep behavior app/src/main/kotlin/io/privkey/keep/nip55/PermissionStore.kt, app/src/androidTest/kotlin/io/privkey/keep/nip55/AppSignPolicyOverridesInstrumentedTest.kt	Expiry cleanup removes grants and preserves DENY and ASK rows. It removes an expired settings row only after the sign-policy override is cleared and the opt-in is cleared when needed. The instrumented test checks these outcomes.
Cleanup call-site wiring app/src/main/kotlin/io/privkey/keep/KeepMobileApp.kt, app/src/main/kotlin/io/privkey/keep/MainActivity.kt, app/src/main/kotlin/io/privkey/keep/nip55/Nip55ContentProvider.kt	Passes auto-signing safeguards to cleanup during app initialization, settings cleanup, and handling of expired-deny rejections.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Suggested reviewers: wksantiago

Merge Risk: 🟡 Moderate · up to 35da6

An app whose settings window expires should now have to be approved again. Three issues may undermine that. Existing expiry tests probably fail against the new cleanup rules. A window refreshed during cleanup could be deleted. If the opt-in preference cannot be read, an expired app could later regain auto-signing. Resolve or confirm these before merging.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 53.85% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 13 functions across 7 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: expired settings windows require re-approval instead of reverting to the global policy.

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_{A rabbit checks the grants at dawn
DENY and ASK stay firmly drawn
Expired settings wait their turn
Opt-in clears before they burn
Then hops away beneath the fern}

_{Comment @coderabbitai help to get the list of available commands.}

[coderabbitai]

Actionable comments posted: 3

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at
@app/src/main/kotlin/io/privkey/keep/nip55/PermissionStore.kt:
- Around line 124-125: Update the expiry handling around isOptedIn and
clearOptIn to call clearOptIn for every expired package, regardless of the read
result, and require a successful commit before deleting the expired settings
row.
- Line 75: Update the expiry-sweep tests around cleanupExpired to pass
safeguards where they expect expired rows to be deleted. Add or adjust a test
for unavailable safeguards to assert that the row remains when autoSigning is
omitted; cover both the core-override and no-core-store cases described.
- Line 108: Update the cleanup flow in PermissionStore so it coordinates with
settings refreshes and deletes only if the same expired window is still present;
do not let the package-only delete remove a row refreshed after isExpired() ran.

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📥 Commits

Reviewing files that changed from the base of the PR and between ab5b0c7 and 35da652.

📒 Files selected for processing (7)

• app/src/androidTest/kotlin/io/privkey/keep/nip55/AppSignPolicyOverridesInstrumentedTest.kt
• app/src/main/kotlin/io/privkey/keep/KeepMobileApp.kt
• app/src/main/kotlin/io/privkey/keep/MainActivity.kt
• app/src/main/kotlin/io/privkey/keep/nip55/AutoSigningSafeguards.kt
• app/src/main/kotlin/io/privkey/keep/nip55/Nip55ContentProvider.kt
• app/src/main/kotlin/io/privkey/keep/nip55/PermissionDaos.kt
• app/src/main/kotlin/io/privkey/keep/nip55/PermissionStore.kt

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