feat: add Maple alerts integration

[Makisuo]

Summary

• Adds Maple (maple.dev, an OpenTelemetry observability platform) as a new webhook-based integration that posts alert triggers, resolves, renotifies, and tests into a Hazel channel as rich embeds.
• Mirrors the existing Railway / OpenStatus pattern — no new infrastructure; reuses the channel webhook + integration bot machinery.
• Accepts Maple's standard buildPayload() JSON unchanged on a new /maple route, so there's no parallel payload schema between the two systems.

Changes

Integrations package (@hazel/integrations)

• common/bot-configs.ts — register maple in WebhookProvider with the maple.dev Brandfetch icon.
• New src/maple/ module: payloads.ts (TS interfaces matching Maple's webhook payload), colors.ts (severity → color/badge mapping for trigger / resolve / renotify / test), embed-builder.ts (buildMapleEmbed), plus index.ts / browser.ts exports.
• package.json — wire ./maple and ./maple/browser exports.

Domain

• http/incoming-webhooks.ts — new MaplePayload Effect Schema and an executeMaple endpoint at POST /webhooks/incoming/:webhookId/:token/maple.
• rpc/channel-webhooks.ts — extend the integrationProvider literal on channelWebhook.create to accept "maple" so the org-scoped integration-bot reuse path applies.

Backend

• routes/incoming-webhooks.http.ts — executeMaple handler: token validation (timing-safe), IntegrationBotService.getOrCreateWebhookBotUser(\"maple\", ...), embed-only message + outbox event + lastUsedAt update. Identical shape to executeRailway.

Web

• lib/integrations/__data.ts — Maple marketplace card (developer-tools, webhook connection type).
• components/embeds/use-embed-theme.ts — register maple as an EmbedProvider.
• routes/.../integrations/$integrationId.tsx — recognize \"maple\" as a webhook integration and route to the new content component.
• New: components/integrations/maple-integration-content.tsx, configure-maple-modal.tsx, channel-settings/maple-section.tsx. Setup UX shows the generated …/maple URL with a copy button and instructions to paste it as a Hazel destination in Maple → Alerts → Destinations.

Reviewer notes

• No DB migration. The integration uses the existing channel_webhooks table; bot identity is the shared per-org integration-bot-maple user via IntegrationBotService.
• The companion Maple-side change (a dedicated \"hazel\" destination type that POSTs to /maple) is in a separate PR on the maple repo.
• Token / signing: the URL token is validated as today (SHA-256 + timingSafeEqual). HMAC verification of x-maple-signature is not implemented yet — left as a follow-up since the URL token itself is already an authenticated bearer credential. Maple sends the header when a signing secret is configured; Hazel currently ignores it.
• Idempotency: Hazel does not deduplicate by Maple's dedupeKey, so a retried delivery from Maple will produce a duplicate channel message. Acceptable for now; can be added later via a uniqueness index keyed on dedupeKey.

Test plan

• bun run typecheck passes (verified locally — 18/18 packages).
• In a running Hazel web app, navigate to /{org}/settings/integrations/maple → confirm the marketplace card renders with the Maple icon.
• Click Add Channel, pick a test channel, copy the generated …/maple webhook URL.
• On the Maple side (companion PR), create a Hazel destination with that URL and hit Test → confirm a Maple-branded test embed appears in the chosen Hazel channel with severity badge and "Open in Maple" link.
• Trigger a real rule with the Hazel destination attached → confirm both trigger (red/amber) and resolve (green) embeds render correctly.
• Disable then re-enable the webhook from the channel section → confirm webhooks toggle without data loss.
• Delete the webhook → confirm the bot user persists (org-scoped reuse) but the channel webhook is removed.

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[claude]

Claude finished @Makisuo's task —— View job

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PR Review: Maple Alerts Integration

I've completed a thorough review of this Maple alerts integration PR. Overall, this is high-quality code that follows excellent patterns and closely mirrors the existing OpenStatus/Railway integrations. Here's my detailed analysis:

Todo List:

• Review backend webhook handler implementation
• Check frontend components and integration setup
• Evaluate security considerations
• Assess adherence to project patterns
• Check for potential bugs and issues
• Review performance implications
• Evaluate test coverage

---

✅ Strengths & Best Practices

Backend Implementation

• Excellent pattern adherence: The executeMaple handler follows existing webhook patterns perfectly
• Strong security: Proper timing-safe token validation using timingSafeEqual
• Robust architecture: Transaction-wrapped message creation with outbox pattern for eventual consistency
• Good error handling: Uses structured Effect error types with proper HTTP status codes
• Performance optimized: Fire-and-forget pattern for updateLastUsed to avoid blocking

Frontend Implementation

• Clean component structure: Well-organized React components with proper separation of concerns
• Good UX patterns: Follows existing integration setup flows with clear success states
• Proper state management: Uses Effect Atom patterns consistently
• Accessible UI: Proper ARIA labels and keyboard navigation

Integration Package

• Well-designed schemas: TypeScript interfaces cleanly mirror Maple's payload structure
• Smart color mapping: Severity-aware styling with proper color codes
• Rich embeds: Comprehensive embed builder with proper field formatting
• Clean exports: Proper browser/server separation with index/browser entry points

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⚠️ Areas for Improvement

1. Code Duplication (Medium Priority)

The three webhook handlers (executeOpenStatus, executeRailway, executeMaple) share ~90% identical code. Consider extracting shared logic:

Location: apps/backend/src/routes/incoming-webhooks.http.ts:371-463

Suggestion: Extract a shared handler function:

const executeWebhookHandler = <T>(
  provider: WebhookProvider,
  buildEmbed: (payload: T) => MessageEmbed
) => ({ params, payload }: { params: { webhookId: string; token: string }; payload: T }) =>
  Effect.gen(function* () {
    // Common validation logic...
    const botUser = yield* botService.getOrCreateWebhookBotUser(provider, webhook.organizationId)
    const embed = buildEmbed(payload)
    // Common message creation logic...
  })

This would reduce maintenance burden and ensure consistency across webhook handlers.

2. Missing HMAC Verification (Low Priority)

Location: Backend webhook handler

The PR description notes that HMAC verification via x-maple-signature is not implemented yet. While the URL token provides authentication, HMAC verification is a security best practice for webhooks:

// Future enhancement suggestion:
const verifyMapleSignature = (payload: string, signature: string, secret: string) => {
  const expectedSignature = createHmac('sha256', secret).update(payload).digest('hex')
  return timingSafeEqual(Buffer.from(signature), Buffer.from(expectedSignature))
}

3. No Idempotency Handling (Low Priority)

Location: Backend webhook handler

The PR description mentions that Maple sends a dedupeKey, but Hazel doesn't deduplicate. While acceptable for now, consider adding a unique index on dedupeKey for the future to prevent duplicate messages on retry.

4. Minor: Missing Null Safety

Location: packages/integrations/src/maple/embed-builder.ts:58

// Current - potential null issue:
const observedValue = `${formatNumber(observed.value)} (threshold ${COMPARATOR_LABEL[rule.comparator]} ${formatNumber(rule.threshold)})`

// Suggestion - add null check:
if (observed.value !== null && observed.value !== undefined) {
  const observedValue = `${formatNumber(observed.value)} (threshold ${COMPARATOR_LABEL[rule.comparator]} ${formatNumber(rule.threshold)})`
  // ...
}

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🔒 Security Assessment

✅ Strong Security Posture:

• Timing-safe token comparison prevents timing attacks
• URL tokens are properly hashed with SHA-256
• No direct SQL injection vectors (using Drizzle ORM)
• Proper input validation via Effect schemas
• No credential leakage in logs

Future considerations:

• Add HMAC signature verification for defense-in-depth
• Consider rate limiting for webhook endpoints

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🚀 Performance & Scalability

✅ Well Optimized:

• Minimal database queries (single transaction)
• Fire-and-forget updates don't block responses
• Proper Effect error handling avoids unnecessary computation
• Clean embed building with minimal string operations

No performance concerns identified.

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🧪 Test Coverage

⚠️ Missing Tests:
The PR doesn't include tests for the new Maple integration. Consider adding:

1. Unit tests for buildMapleEmbed function with different event types
2. Integration tests for the webhook endpoint
3. Frontend component tests for the Maple integration setup flow

Example test structure:

// packages/integrations/src/maple/__tests__/embed-builder.test.ts
describe('buildMapleEmbed', () => {
  it('should build trigger embed with critical severity', () => {
    // Test critical trigger event
  })
  
  it('should build resolve embed with success styling', () => {
    // Test resolve event
  })
})

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📋 Final Recommendations

Required Before Merge

• Run typecheck: Verify bun run typecheck passes (mentioned as verified locally)
• Add basic tests: At minimum, unit tests for embed builder

Nice to Have

• Extract shared webhook handler: Reduce code duplication
• Add integration tests: Test the full webhook flow
• Document HMAC verification: Plan for future security enhancement

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🎯 Overall Assessment

This is excellent work that demonstrates strong engineering practices:

• ✅ Follows established patterns perfectly
• ✅ Strong security implementation
• ✅ Clean, maintainable code structure
• ✅ Comprehensive feature implementation
• ✅ Good documentation in PR description

The integration is production-ready with only minor improvements suggested. The code quality is consistent with the rest of the Hazel codebase and properly implements all the expected functionality.

Recommendation: APPROVE with the minor suggestions addressed in follow-up PRs.

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