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Integrate slackbot with baml client and sage backend #2308
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163 changes: 163 additions & 0 deletions
163
typescript/apps/sage-backend/app/api/slack/events/route.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,163 @@ | ||
| import type { NextRequest } from 'next/server'; | ||
| import { NextResponse, after } from 'next/server'; | ||
| import crypto from 'crypto'; | ||
| import { WebClient } from '@slack/web-api'; | ||
| import { submitQuery } from '@/app/actions/query'; | ||
| import type { Message, QueryRequest } from '@baml/sage-interface'; | ||
|
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| export const runtime = 'nodejs'; | ||
|
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| function timingSafeEqual(a: string, b: string): boolean { | ||
| const aBuf = Buffer.from(a, 'utf8'); | ||
| const bBuf = Buffer.from(b, 'utf8'); | ||
| if (aBuf.length !== bBuf.length) return false; | ||
| return crypto.timingSafeEqual(aBuf, bBuf); | ||
| } | ||
|
|
||
| function verifySlackSignature({ | ||
| rawBody, | ||
| timestamp, | ||
| signature, | ||
| secret, | ||
| }: { | ||
| rawBody: string; | ||
| timestamp: string | null; | ||
| signature: string | null; | ||
| secret: string; | ||
| }): boolean { | ||
| if (!timestamp || !signature) return false; | ||
| // Reject old timestamps (> 5 minutes) | ||
| const fiveMinutes = 60 * 5; | ||
| const tsNum = Number(timestamp); | ||
| if (!Number.isFinite(tsNum)) return false; | ||
| const now = Math.floor(Date.now() / 1000); | ||
| if (Math.abs(now - tsNum) > fiveMinutes) return false; | ||
|
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| const sigBase = `v0:${timestamp}:${rawBody}`; | ||
| const hmac = crypto.createHmac('sha256', secret).update(sigBase).digest('hex'); | ||
| const expected = `v0=${hmac}`; | ||
| return timingSafeEqual(expected, signature); | ||
| } | ||
|
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||
| function stripMentionsAndFormatting(text: string): string { | ||
| return text | ||
| .replace(/<@[^>]+>/g, '') // remove mentions | ||
| .replace(/<([^|>]+)\|[^>]+>/g, '$1') // <url|text> -> url | ||
| .replace(/\s+/g, ' ') | ||
| .trim(); | ||
| } | ||
|
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| export async function POST(req: NextRequest) { | ||
| const signingSecret = process.env.SLACK_SIGNING_SECRET; | ||
| const botToken = process.env.SLACK_BOUNDARY_BOT_TOKEN; | ||
| if (!signingSecret || !botToken) { | ||
| return NextResponse.json({ error: 'Slack environment not configured' }, { status: 500 }); | ||
| } | ||
|
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| const rawBody = await req.text(); | ||
| const timestamp = req.headers.get('x-slack-request-timestamp'); | ||
| const signature = req.headers.get('x-slack-signature'); | ||
|
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| if (!verifySlackSignature({ rawBody, timestamp, signature, secret: signingSecret })) { | ||
| return NextResponse.json({ error: 'Invalid signature' }, { status: 401 }); | ||
| } | ||
|
|
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| let payload: any; | ||
| try { | ||
| payload = JSON.parse(rawBody); | ||
| } catch (e) { | ||
| return NextResponse.json({ error: 'Invalid JSON' }, { status: 400 }); | ||
| } | ||
|
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| // URL verification challenge | ||
| if (payload.type === 'url_verification' && payload.challenge) { | ||
| return new NextResponse(payload.challenge, { | ||
| headers: { 'content-type': 'text/plain' }, | ||
| }); | ||
| } | ||
|
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| // Acknowledge immediately; process asynchronously | ||
| after(async () => { | ||
| try { | ||
| const event = payload.event; | ||
| if (!event) return; | ||
|
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| // Only handle app mentions and direct messages for now | ||
| if (event.type !== 'app_mention' && !(event.type === 'message' && event.channel_type === 'im')) { | ||
| return; | ||
| } | ||
|
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| const slack = new WebClient(botToken); | ||
| const channel: string = event.channel; | ||
| const thread_ts: string = event.thread_ts || event.ts; | ||
| const text: string = typeof event.text === 'string' ? event.text : ''; | ||
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| const cleaned = stripMentionsAndFormatting(text); | ||
| if (!cleaned) return; | ||
|
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| // Build prev_messages from thread history (last 10 messages) | ||
| let prev_messages: Message[] = []; | ||
| try { | ||
| const auth = await slack.auth.test(); | ||
| const botUserId = auth.user_id; | ||
| const replies = await slack.conversations.replies({ channel, ts: thread_ts, inclusive: true, limit: 10 }); | ||
| const msgs = (replies.messages || []) as Array<{ user?: string; bot_id?: string; text?: string; subtype?: string; ts: string }>; | ||
| prev_messages = msgs | ||
| .filter((m) => !m.subtype || m.subtype === 'bot_message') | ||
| .map((m) => { | ||
| const mText = stripMentionsAndFormatting(m.text || ''); | ||
| const isAssistant = (m.user && m.user === botUserId) || Boolean(m.bot_id); | ||
| if (isAssistant) { | ||
| return { | ||
| role: 'assistant', | ||
| message_id: `slack-${m.ts}`, | ||
| text: mText, | ||
| ranked_docs: [], | ||
| } as Message; | ||
| } | ||
| return { | ||
| role: 'user', | ||
| text: mText, | ||
| } as Message; | ||
| }) | ||
| .slice(0, -1); // exclude current event message | ||
| } catch {} | ||
|
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| const sessionId = `${channel}:${thread_ts}`; | ||
| const request: QueryRequest = { | ||
| session_id: sessionId, | ||
| prev_messages, | ||
| message: { | ||
| role: 'user', | ||
| text: cleaned, | ||
| language_preference: 'en', | ||
| }, | ||
| }; | ||
|
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| // Optional: send typing indicator (ephemeral) | ||
| try { | ||
| await slack.chat.postEphemeral({ channel, user: event.user, text: 'Thinking…' }); | ||
| } catch {} | ||
|
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| const result = await submitQuery(request); | ||
|
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| const answer = result.message.text || 'I could not find an answer.'; | ||
| const links = (result.message.ranked_docs || []) | ||
| .slice(0, 3) | ||
| .map((d) => `<${d.url}|${d.title}>`) | ||
| .join(' • '); | ||
|
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| const finalText = links ? `${answer}\n\nSources: ${links}` : answer; | ||
|
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| await slack.chat.postMessage({ | ||
| channel, | ||
| text: finalText, | ||
| thread_ts, | ||
| }); | ||
| } catch (err) { | ||
| console.error('Slack event handling failed:', err); | ||
| } | ||
| }); | ||
|
|
||
| return NextResponse.json({ ok: true }); | ||
| } | ||
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