109 lines
3.5 KiB
TypeScript
109 lines
3.5 KiB
TypeScript
import * as functions from 'firebase-functions'
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import * as admin from 'firebase-admin'
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/**
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* Firestore trigger that sends an FCM notification to the other partner when
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* one partner writes an answer under
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* couples/{coupleId}/daily_question/{date}/answers/{userId}.
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*
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* The notification payload is a data message so the client can route directly to
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* the answer reveal screen. It also contains a `notification` block for
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* system-tray display when the app is in the background.
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*/
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export const onAnswerWritten = functions.firestore
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.document('couples/{coupleId}/daily_question/{date}/answers/{userId}')
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.onCreate(async (snap, context) => {
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const { coupleId, date, userId } = context.params as {
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coupleId: string
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date: string
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userId: string
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}
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const db = admin.firestore()
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const coupleDoc = await db.collection('couples').doc(coupleId).get()
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if (!coupleDoc.exists) {
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console.warn(`[onAnswerWritten] couple ${coupleId} not found`)
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return
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}
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const userIds = (coupleDoc.data()?.userIds ?? []) as string[]
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const partnerId = userIds.find((uid) => uid !== userId)
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if (!partnerId) {
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console.warn(`[onAnswerWritten] no partner found for couple ${coupleId}`)
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return
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}
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// Look up the partner's FCM tokens. We support a legacy `fcmToken` field
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// on the user doc and a dedicated `fcmTokens` subcollection for multiple devices.
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const tokens: string[] = []
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const partnerUserDoc = await db.collection('users').doc(partnerId).get()
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if (partnerUserDoc.exists) {
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const legacyToken = partnerUserDoc.data()?.fcmToken
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if (typeof legacyToken === 'string' && legacyToken.length > 0) {
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tokens.push(legacyToken)
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}
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}
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const tokenSnapshot = await db
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.collection('users')
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.doc(partnerId)
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.collection('fcmTokens')
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.get()
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tokenSnapshot.docs.forEach((doc) => {
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const t = doc.data()?.token
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if (typeof t === 'string' && t.length > 0 && !tokens.includes(t)) {
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tokens.push(t)
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}
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})
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if (tokens.length === 0) {
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console.log(`[onAnswerWritten] no FCM tokens for partner ${partnerId}`)
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return
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}
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// Respect the partner's notification preference (opt-out; default is enabled).
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const notifEnabled = partnerUserDoc.data()?.notifPartnerAnswered
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if (notifEnabled === false) {
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console.log(`[onAnswerWritten] partner ${partnerId} has partner-answered notifications off`)
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return
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}
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const answerData = snap.data() as Partial<Record<string, unknown>>
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const questionId = typeof answerData.questionId === 'string' ? answerData.questionId : ''
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const payload: admin.messaging.MessagingPayload = {
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notification: {
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title: 'Your partner just answered!',
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body: "See what they shared for tonight's prompt.",
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},
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data: {
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type: 'partner_answered',
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coupleId,
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questionId,
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date,
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},
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}
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const sendResults = await Promise.allSettled(
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tokens.map((token) =>
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admin.messaging().send({ ...payload, token } as admin.messaging.Message)
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)
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)
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const failures: string[] = []
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sendResults.forEach((result, index) => {
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if (result.status === 'rejected') {
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failures.push(`${tokens[index]}: ${String(result.reason)}`)
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}
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})
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if (failures.length > 0) {
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console.error(`[onAnswerWritten] some notifications failed:`, failures)
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}
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console.log(
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`[onAnswerWritten] notified partner ${partnerId} for couple ${coupleId} question ${questionId}`
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)
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})
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