fix(ios): keep a protected companion route first after restart

[santhiprakash]

What changed

Connection.orderedEndpoints now leads with a protected activeEndpoint after a successful hosted/tailnet upgrade, so the trust ratchet survives process restart. A regression test encodes/decodes the saved connection and rebuilds CandidateRotation the way Session does on launch.

Fixes #479.

Why

A hand-typed LAN origin is stored at priority: 0. CandidateRotation.advance already drops that cleartext route once a protected route answers, and promote records the winner as activeEndpoint. The stored order still sorted by priority, so the next launch rebuilt the rotation from LAN-first orderedEndpoints, treated that address as the explicit local choice, and sent the long-lived bearer there again. Endpoint refresh is best-effort and does not cover this: a 404, failure, or cancel leaves the broken order on disk.

How it was verified

Deterministic reproduction of orderedEndpoints + automaticCandidates (the functions Session uses on restore). LAN at priority 0, hosted at priority 100, activeEndpoint = hosted:

before kinds ['lan', 'hosted'] auto ['lan', 'hosted']
after kinds  ['hosted', 'lan'] auto ['hosted']

• Before: restart retries the superseded LAN route with the bearer.
• After: restart starts on hosted HTTPS and drops cleartext from automatic candidates.
• promote(lan) still leaves hosted first when hosted has the better advertised priority (existing testTypedRoutesKeepHostedHTTPSAheadOfAnActiveLANFallback).
• Typing a LAN address again still leads (resetRoutePolicy); that remains the escape hatch when hosted is down.

New XCTest: testPromotingAProtectedRouteLeadsAfterRestartDespiteAPriorityZeroLocalRoute in ios/Tests/CompanionCoreTests/FailoverTests.swift. This Linux host has no Swift toolchain; CI swift test in ios/ will run it.

No server/JS change; pnpm typecheck / pnpm test are not applicable to this diff.

Screenshots (UI changes)

n/a — CompanionCore routing only.

Checklist

• pnpm typecheck and pnpm test pass locally
• Server behavior changes come with tests (see CONTRIBUTING.md → Tests)
• No dist-server/ edits (it's build output)
• macOS-only code is platform-gated; no shell: true / cmd.exe string-building
• No secrets in logs, responses, events, or argv

Problem

Hand-typed local address (priority: 0) → rotation upgrades to hosted/tailnet and prunes LAN in memory → promote(hosted) saves activeEndpoint but does not reorder → next launch CandidateRotation(endpoints: saved.orderedEndpoints) starts at LAN again and carries the device token onto cleartext.

Triage / Root cause

orderedEndpoints sorts only by priority then original offset, and appends activeEndpoint only when it is missing. promote(_: CompanionEndpoint) assigns activeEndpoint and never reprioritises. The ratchet therefore lived only inside one CandidateRotation value.

Fix

After the priority sort, if activeEndpoint already protects credentials, put it first. The superseded LAN origin stays in endpoints for display and a later manual choice. Typing a local address again sets activeEndpoint to that explicit-local route, so priority order applies once more.

Verification

Python reproduction of the sort + automaticCandidates as quoted above (before/after). New FailoverTests case round-trips the Connection through JSONEncoder/JSONDecoder and asserts the restored rotation starts on hosted and contains only protected candidates.

Notes / Risks

Does not touch ios/App/Session.swift (open #499 is on that file). Does not change invite policy, resetRoutePolicy, or the existing “don't let LAN jump ahead of a better-priority hosted route” case. Android #349 is diverging on this path by design; this PR is the Swift store only.

Summary by CodeRabbit

• Bug Fixes
  • Improved connection failover after restart by prioritizing an eligible active protected route when a cleartext route would otherwise lead.
  • Prevented automatic selection of disallowed or cleartext routes when a protected route is available.
  • Preserved route priority ordering when protected routes are already preferred.
  • Kept eligible hosted protected routes ahead of lower-priority LAN routes while retaining automatic failover options.
  • Explicit LAN route selection remains available as a fallback when needed.

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• ios/Sources/CompanionCore/Failover.swift
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📝 Walkthrough

Walkthrough

Failover ordering now filters routes through policy before sorting. It promotes an active protected endpoint only when a cleartext route leads. Tests cover persistence, restart rotation, automatic filtering, and explicit LAN selection.

Changes

Failover protection

Layer / File(s)	Summary
Protected route ordering and persistence ios/Sources/CompanionCore/Failover.swift, ios/Tests/CompanionCoreTests/FailoverTests.swift	orderedEndpoints filters disallowed routes before priority sorting and promotes an active protected endpoint over a cleartext lead. Tests cover hosted-route ordering, persistence, restart rotation, automatic filtering, and explicit LAN selection.

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

Merge Risk: ⚪ Minimal · up to 7e1ea

This localized iOS routing change keeps the protected endpoint first after restart and includes regression coverage; no actionable merge-blocking risk remains beyond normal validation.

Suggested reviewers: milind-soni

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the primary change: keeping a protected companion route first after restart.
Description check	✅ Passed	The description includes the required What changed, Why, How it was verified, Screenshots, and Checklist sections. It explains the root cause, fix, scope, tests, and verification status. The unchecked…
Linked Issues check	✅ Passed	The implementation meets issue #479. It preserves the protected active route across restart, filters disallowed cleartext routes from automatic candidates, retains the LAN route for display and explic…
Out of Scope Changes check	✅ Passed	The changes are limited to iOS failover ordering and related regression tests. They do not include unrelated server, JavaScript, session, invite-policy, or Android changes.

Full details: Description check

Explanation

The description includes the required What changed, Why, How it was verified, Screenshots, and Checklist sections. It explains the root cause, fix, scope, tests, and verification status. The unchecked pnpm items are explicitly marked not applicable because this is an iOS-only change.

Full details: Linked Issues check

Explanation

The implementation meets issue #479. It preserves the protected active route across restart, filters disallowed cleartext routes from automatic candidates, retains the LAN route for display and explicit manual selection, and adds regression coverage for persistence and ordering.

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[lightcloud00]

Contributor follow-up published

The protected-route ordering repair is now available as santhiprakash/OpenMausBot#2, targeting the exact contributor branch behind upstream PR #500.

• exact head: 18e9eefdcce0b7d20ca19b338e36d85079b6764b
• remote SHA readback matches
• full Node 24 fleet gate passed
• CodeRabbit is green and the contributor PR is mergeable
• 8 focused ordering regressions and all 183 Swift tests passed before publication

This keeps every credential-protecting route ahead of cleartext after restart while retaining intentional alternatives. The merge attempt was made once and GitHub correctly denied it because lightcloud00 has read-only access to the contributor fork. The remaining action is for santhiprakash to merge the one-commit follow-up so upstream PR #500 receives the fix without rewriting contributor history.

[santhiprakash]

The Swift job failure was real and is fixed in e5fcd8b: my hoist promoted any protected activeEndpoint above the priority sort, so a tailnet invite whose desktop also advertises hosted HTTPS (better priority) ordered [tailnet, hosted] after refresh — testExplicitTailscaleInviteAllowsTailnetAndHostedAfterRefresh caught it. The hoist now applies only when the priority-sorted head is cleartext; when the head is itself protected the advertised priority stands. Added testAPriorityPreferredProtectedHeadOutranksTheActiveProtectedRoute mirroring that scenario, and re-traced every orderedEndpoints/automaticEndpoints assertion in both test suites against the new condition.

[coderabbitai]

Actionable comments posted: 1

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Inline comments:
In `@ios/Sources/CompanionCore/Failover.swift`:
- Around line 336-339: The failover promotion logic around activeEndpoint and
sortedHead must evaluate only route-policy-allowed candidates. Apply
endpointsAllowedByRoutePolicy before selecting sortedHead, or recompute
sortedHead from the filtered candidates, so disallowed cleartext endpoints
cannot trigger promotion and the resulting protected candidate order is
preserved.

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