Harden callback identities and preserve split newlines

[MrBeldum]

Summary

Follow-up hardening from the CodeRabbit review of #64, tracked in #69.

• Preserve split newlines in splitMessage: stop stripping the leading \n after a cut so joined visible text round-trips exactly across chunks.
• Namespace snooze callbacks as snz:d:<key> (direct) and snz:h:<digest> (hashed) so a direct key can never be misparsed as a hash lookup.
• Stronger fingerprints: replace CRC32 with truncated SHA-256 (8 bytes / 16 hex) in snoozeCallbackData and watchIndexData, still under Telegram’s 64-byte callback_data limit.

Skips docstring-coverage noise (item 4).

Closes #69.

Test plan

• go test ./internal/telegram/ ./internal/agent/
• Manual: snooze a short-key alert (cpu) and a long-key alert; confirm both resolve
• Manual: /watching remove buttons still match fingerprints after list edits

Summary by CodeRabbit

• Bug Fixes
  • Improved callback handling for snooze and watch actions, including validation of malformed or outdated callback data.
  • Preserved newline characters when splitting long messages, maintaining the original visible text more accurately.
• Tests
  • Updated coverage for callback validation, long-key handling, stale callbacks, and message formatting at split boundaries.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 107a631 and 464b54d.

📒 Files selected for processing (4)

• internal/agent/keyboard.go
• internal/agent/snooze_test.go
• internal/agent/watch.go
• internal/agent/watching_test.go

🚧 Files skipped from review as they are similar to previous changes (4)

• internal/agent/watching_test.go
• internal/agent/snooze_test.go
• internal/agent/keyboard.go
• internal/agent/watch.go

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📝 Walkthrough

Walkthrough

The agent now emits namespaced, truncated SHA-256 callback identities for snooze and watch actions while accepting supported legacy CRC32 callbacks. Telegram message splitting preserves boundary newlines and verifies exact visible-text recovery.

Changes

Callback identity hardening

Layer / File(s)	Summary
Snooze callback encoding and compatibility internal/agent/agent.go, internal/agent/keyboard.go, internal/agent/snooze_test.go	Snooze callbacks use snz:d: for direct keys and snz:h: with truncated SHA-256 digests for long keys. Resolution also accepts legacy direct and CRC32 callbacks.
Watch callback digest compatibility internal/agent/watch.go, internal/agent/watching_test.go	Watch callbacks emit 16-character lowercase SHA-256 digests. Parsing and matching also accept 8-character lowercase CRC32 fingerprints and reject malformed values.

Telegram message splitting

Layer / File(s)	Summary
Boundary newline preservation internal/telegram/telegram.go, internal/telegram/telegram_test.go	Message splitting no longer removes a leading newline from the next chunk. Tests verify exact visible-text recovery, including boundary newlines.

Priority: ⬇️ Low

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

Change: Bug fix · Severity of issue fixed: Low

Suggested reviewers: eliau2005

Merge Risk: 🔵 Low · up to 464b5

After an upgrade restart, some previously displayed long-key snooze buttons can be reported as stale instead of snoozing the alert. The impact is limited to the compatibility window and affected callback form.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 26.32% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 19 functions across 6 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes both primary changes: callback identity hardening and preservation of split newlines. It is concise and specific.
Linked Issues check	✅ Passed	The PR meets the coding requirements in #69. splitMessage preserves boundary newlines, and tests require exact visible-text round-trip. Snooze callbacks use snz:d: and snz:h: namespaces, while d…
Out of Scope Changes check	✅ Passed	The changed files implement the objectives in #69. They update message splitting, snooze identity encoding and decoding, watch callback fingerprints, compatibility handling, lint cleanup, and related …

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Actionable comments posted: 2

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Inline comments:
In `@internal/agent/keyboard.go`:
- Around line 253-265: Update resolveSnoozeKey to retain bounded decoding for
legacy snz:<key> and snz:h<8-hex CRC32 digest> callback formats, while
preserving the existing snz:d: and snz:h: handling. Ensure valid legacy
callbacks resolve to the corresponding snooze key so handleCallback can still
call Engine.Snooze, and keep callback emission on the new namespaced SHA-256
formats only.

In `@internal/agent/watch.go`:
- Around line 666-703: Update parseWatchIndexData and matchWatchItem to accept
both 16-character SHA-256 fingerprints and bounded 8-character CRC32
fingerprints from existing callbacks, while keeping watchIndexData generating
only 16-character fingerprints. Preserve validation and reject malformed or
unsupported fingerprints.

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Configuration used: Path: .coderabbit.yaml

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📥 Commits

Reviewing files that changed from the base of the PR and between 898a251 and 107a631.

📒 Files selected for processing (7)

• internal/agent/agent.go
• internal/agent/keyboard.go
• internal/agent/snooze_test.go
• internal/agent/watch.go
• internal/agent/watching_test.go
• internal/telegram/telegram.go
• internal/telegram/telegram_test.go

💤 Files with no reviewable changes (1)

• internal/telegram/telegram.go

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[eliau2005]

Approved — thanks for jumping on this so fast, @MrBeldum! 🙌 This is a clean, faithful follow-up to #69.

• Newline preservation — dropping the leading-\n strip is correct; nice touch tightening TestSplitMessageHTMLPre to assert the joined visible text matches the original exactly rather than just Contains.
• snz: namespacing — snz:d: / snz:h: removes the ambiguity cleanly, and unknown/malformed callbacks still fall through to "stale snooze".
• Truncated SHA-256 fingerprints — 64-bit digest replaces CRC32 at both encoders and the hr: path, with length/hex validation in parseWatchIndexData; payloads stay well under Telegram's 64-byte limit.

test and GitGuardian are green.

One non-blocking note for awareness: since this changes the snz: wire format, any alert buttons already on screen at the moment of the auto-update will answer "stale snooze" once (the old snz:<key> no longer matches). That's an unavoidable one-time transition and only affects in-flight alerts — new alerts after restart are fine.

Ready to merge. Thanks again for the solid contribution — and don't forget that ⭐ if you're enjoying the project! 🚀

[eliau2005]

@MrBeldum one more small thing before we merge — CodeRabbit flagged the same upgrade-transition point I noted, and it's worth handling since the old wire format shipped in #64 and is already live on main. When a running instance auto-updates, alert/watch buttons already on screen use the previous encoding and will answer "stale snooze" / "stale list" once. A bounded legacy-decode path makes the upgrade seamless:

1. resolveSnoozeKey (internal/agent/keyboard.go) — in addition to the new snz:d:/snz:h: forms, also accept the legacy snz:<key> and snz:h<8-hex CRC32> callbacks for resolution. Keep emitting only the new namespaced SHA-256 forms.
2. parseWatchIndexData / matchWatchItem (internal/agent/watch.go) — accept both the new 16-char SHA-256 fingerprint and the legacy 8-char CRC32 form when matching, while watchIndexData continues to generate only the 16-char SHA-256 form. (For CRC32 matching you'd compare against crc32.ChecksumIEEE of the item as before.)

Also a quick lint nit from golangci-lint: QF1001 (De Morgan's law) at watch.go:689 — worth simplifying while you're in there.

Everything else looks great and my approval stands — just these compat paths + the lint tidy and it's good to merge. Thanks again! 🙏

[MrBeldum]

@eliau2005 legacy compat + QF1001 are in — resolveSnoozeKey accepts snz:<key> / snz:h<8-hex CRC32> (still emits only snz:d: / snz:h:), watch parse/match accepts 8-char CRC32 alongside 16-char SHA-256, and the De Morgan tidy at watch.go is done. Tests cover the legacy decode paths.

[eliau2005]

@MrBeldum Great work, Thank u!