feat(slack): add HTTP webhook mode #1143
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Implements Slack URL verification for webhook setup: - isUrlVerification type guard - handleUrlVerification returns challenge string - SlackChallengeEvent interface Part of: slack-http-webhook-mode feature
Implements HMAC-SHA256 signature verification per Slack spec: - Replay protection (5-minute timestamp window) - Constant-time comparison via timingSafeEqual - JSDoc documentation Part of: slack-http-webhook-mode feature
Adds new config fields to SlackConfigSchema: - mode: 'socket' | 'http' (default: socket) - signingSecret: string for HTTP webhook verification - webhookPath: string for webhook endpoint (default: /slack/events) Includes validation: mode='http' requires signingSecret. Part of: slack-http-webhook-mode feature
Implements main HTTP request handler for Slack webhooks: - createSlackHttpHandler factory function - Raw body reading for signature verification - Header extraction for x-slack-signature/x-slack-request-timestamp - URL verification challenge handling - Immediate 200 acknowledgment (Slack <3s requirement) - Async event dispatch via queueMicrotask - Barrel export in index.ts Part of: slack-http-webhook-mode feature
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Hey J! Did you test this, does this work well? |
steipete
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Co-authored-by: Jonathan Rhyne <[email protected]>
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steipete
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Co-authored-by: Jonathan Rhyne <[email protected]>
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Jan 21, 2026
…jdrhyne Co-authored-by: Jonathan Rhyne <[email protected]>
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Summary
Adds HTTP webhook mode for Slack integration, enabling serverless deployments without Socket Mode.
Changes
src/slack/http/signature.ts) — HMAC-SHA256 with replay protectionsrc/slack/http/challenge.ts) — Slack URL verificationsrc/slack/http/events.ts) — Request processing with immediate 200 ACKsrc/slack/http/dispatch.ts) — Routes HTTP events to handlersmode,signingSecret,webhookPathfieldsTests
signature.test.ts— 117 lines, covers valid/invalid signatures, replay, edge caseschallenge.test.ts— 36 lines, covers type guard and challenge echoevents.test.ts— 155 lines, integration tests with mocked req/resUsage
Checklist