Initial commit

src/lib/whatsapp.ts

@@ -0,0 +1,86 @@
+import { appendLog, readJsonFile, writeJsonFile } from './storage'
+
+type FlowState = Record<string, { step: string; name?: string }>
+
+function normalizeNumber(number?: string | null) {
+  return (number || '').replace(/\D+/g, '')
+}
+
+export async function sendTextMessage(to: string, message: string) {
+  const apiVersion = process.env.WHATSAPP_API_VERSION || 'v23.0'
+  const phoneNumberId = process.env.WHATSAPP_PHONE_NUMBER_ID || ''
+  const accessToken = process.env.WHATSAPP_ACCESS_TOKEN || ''
+  const url = `https://graph.facebook.com/${apiVersion}/${phoneNumberId}/messages`
+
+  const response = await fetch(url, {
+    method: 'POST',
+    headers: {
+      Authorization: `Bearer ${accessToken}`,
+      'Content-Type': 'application/json',
+    },
+    body: JSON.stringify({
+      messaging_product: 'whatsapp',
+      to,
+      type: 'text',
+      text: { preview_url: false, body: message },
+    }),
+  })
+
+  const payload = await response.json().catch(async () => ({ raw: await response.text() }))
+
+  appendLog({ type: 'outgoing_message', to, message, response: payload, success: response.ok, created_at: new Date().toISOString() })
+
+  if (!response.ok) {
+    throw new Error('Gagal kirim pesan ke WhatsApp')
+  }
+
+  return payload
+}
+
+export async function handleWebhook(payload: any) {
+  appendLog({ type: 'webhook_received', payload, created_at: new Date().toISOString() })
+
+  for (const entry of payload.entry || []) {
+    for (const change of entry.changes || []) {
+      const value = change.value || {}
+
+      for (const message of value.messages || []) {
+        await handleIncomingMessage(message)
+      }
+
+      for (const status of value.statuses || []) {
+        appendLog({ type: 'message_status', status, created_at: new Date().toISOString() })
+      }
+    }
+  }
+}
+
+async function handleIncomingMessage(message: any) {
+  const from = message.from || ''
+  appendLog({ type: 'incoming_message', from, message, created_at: new Date().toISOString() })
+
+  if (normalizeNumber(from) !== normalizeNumber(process.env.WA_TEST_NUMBER)) {
+    appendLog({ type: 'ignored_message', reason: 'sender_not_test_number', from, created_at: new Date().toISOString() })
+    return
+  }
+
+  const body = (message.text?.body || '').trim()
+  const state = readJsonFile<FlowState>('flow-state.json', {})
+  const step = state[from]?.step || 'idle'
+
+  if (body.toLowerCase() === 'daftar' && step === 'idle') {
+    state[from] = { step: 'waiting_name' }
+    writeJsonFile('flow-state.json', state)
+    await sendTextMessage(from, 'Silakan kirim nama Anda.')
+    return
+  }
+
+  if (step === 'waiting_name' && body) {
+    state[from] = { step: 'completed', name: body }
+    writeJsonFile('flow-state.json', state)
+    await sendTextMessage(from, `Terima kasih ${body}, data testing diterima.`)
+    return
+  }
+
+  await sendTextMessage(from, 'Kirim "daftar" untuk mulai flow testing.')
+}