103 lines
3.2 KiB
TypeScript
103 lines
3.2 KiB
TypeScript
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import * as functions from 'firebase-functions'
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import * as admin from 'firebase-admin'
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import { User } from 'common/user'
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import { Manalink } from 'common/manalink'
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import { runTxn, TxnData } from './transact'
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export const claimManalink = functions
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.runWith({ minInstances: 1 })
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.https.onCall(async (slug: string, context) => {
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const userId = context?.auth?.uid
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if (!userId) return { status: 'error', message: 'Not authorized' }
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// Run as transaction to prevent race conditions.
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return await firestore.runTransaction(async (transaction) => {
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// Look up the manalink
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const manalinkDoc = firestore.doc(`manalinks/${slug}`)
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const manalinkSnap = await transaction.get(manalinkDoc)
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if (!manalinkSnap.exists) {
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return { status: 'error', message: 'Manalink not found' }
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}
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const manalink = manalinkSnap.data() as Manalink
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const { amount, fromId, claimedUserIds } = manalink
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if (amount <= 0 || isNaN(amount) || !isFinite(amount))
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return { status: 'error', message: 'Invalid amount' }
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const fromDoc = firestore.doc(`users/${fromId}`)
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const fromSnap = await transaction.get(fromDoc)
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if (!fromSnap.exists) {
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return { status: 'error', message: `User ${fromId} not found` }
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}
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const fromUser = fromSnap.data() as User
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// Only permit one redemption per user per link
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if (claimedUserIds.includes(userId)) {
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return {
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status: 'error',
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message: `${fromUser.name} already redeemed manalink ${slug}`,
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}
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}
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// Disallow expired or maxed out links
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if (manalink.expiresTime != null && manalink.expiresTime < Date.now()) {
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return {
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status: 'error',
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message: `Manalink ${slug} expired on ${new Date(
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manalink.expiresTime
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).toLocaleString()}`,
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}
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}
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if (
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manalink.maxUses != null &&
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manalink.maxUses <= manalink.claims.length
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) {
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return {
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status: 'error',
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message: `Manalink ${slug} has reached its max uses of ${manalink.maxUses}`,
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}
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}
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if (fromUser.balance < amount) {
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return {
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status: 'error',
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message: `Insufficient balance: ${fromUser.name} needed ${amount} for this manalink but only had ${fromUser.balance} `,
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}
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}
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// Actually execute the txn
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const data: TxnData = {
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fromId,
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fromType: 'USER',
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toId: userId,
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toType: 'USER',
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amount,
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token: 'M$',
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category: 'MANALINK',
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description: `Manalink ${slug} claimed: ${amount} from ${fromUser.username} to ${userId}`,
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}
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const result = await runTxn(transaction, data)
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const txnId = result.txn?.id
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if (!txnId) {
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return { status: 'error', message: result.message }
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}
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// Update the manalink object with this info
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const claim = {
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toId: userId,
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txnId,
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claimedTime: Date.now(),
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}
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transaction.update(manalinkDoc, {
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claimedUserIds: [...claimedUserIds, userId],
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claims: [...manalink.claims, claim],
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})
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return { status: 'success', message: 'Manalink claimed' }
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})
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})
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const firestore = admin.firestore()
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