87 lines
2.2 KiB
TypeScript
87 lines
2.2 KiB
TypeScript
import type { Event } from 'nostr-tools'
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import { SimplePool } from 'nostr-tools'
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import { createSubscription } from '@/types/nostr-tools-extended'
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import { getPrimaryRelaySync } from './config'
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function createZapFilters(targetPubkey: string, targetEventId: string, userPubkey: string) {
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return [
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{
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kinds: [9735], // Zap receipt
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'#p': [targetPubkey],
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'#e': [targetEventId],
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authors: [userPubkey], // Filter by the payer's pubkey
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},
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]
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}
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async function isValidZapReceipt(
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event: Event,
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targetEventId: string,
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targetPubkey: string,
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userPubkey: string,
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amount: number
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): Promise<boolean> {
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// Import verification service dynamically to avoid circular dependencies
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const { zapVerificationService } = await import('./zapVerification')
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return zapVerificationService.verifyZapReceiptForArticle(event, targetEventId, targetPubkey, userPubkey, amount)
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}
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/**
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* Check if user has paid for an article by looking for zap receipts
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*/
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function handleZapReceiptEvent(
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event: Event,
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targetEventId: string,
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targetPubkey: string,
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userPubkey: string,
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amount: number,
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finalize: (value: boolean) => void,
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resolved: { current: boolean }
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): void {
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if (resolved.current) {
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return
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}
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void isValidZapReceipt(event, targetEventId, targetPubkey, userPubkey, amount).then((isValid) => {
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if (isValid) {
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finalize(true)
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}
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})
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}
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export function checkZapReceipt(
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pool: SimplePool,
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targetPubkey: string,
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targetEventId: string,
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amount: number,
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userPubkey: string
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): Promise<boolean> {
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if (!pool) {
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return Promise.resolve(false)
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}
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return new Promise((resolve) => {
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let resolved = false
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const relayUrl = getPrimaryRelaySync()
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const sub = createSubscription(pool, [relayUrl], createZapFilters(targetPubkey, targetEventId, userPubkey))
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const finalize = (value: boolean) => {
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if (resolved) {
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return
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}
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resolved = true
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sub.unsub()
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resolve(value)
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}
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const resolvedRef = { current: resolved }
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sub.on('event', (event: Event) => {
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handleZapReceiptEvent(event, targetEventId, targetPubkey, userPubkey, amount, finalize, resolvedRef)
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})
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const end = () => finalize(false)
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sub.on('eose', end)
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setTimeout(end, 3000)
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})
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}
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