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import {
AbiProvider,
CallbackPayload,
Cancelable,
ResolvedSigningRequest,
SignedTransaction,
} from '@wharfkit/session'
import * as zlib from 'pako'
import {extractSignaturesFromCallback, isCallback} from './esr'
const TRANSACTION_HANDOFF_KEY = 'wharfkit:anchor-transaction-handoff'
interface CallbackChannel {
channel: string
service: string
}
export interface TransactionHandoff {
version: 1
returnUrl: string
callback: CallbackChannel
transactionId: string
chainId: string
actor: string
permission: string
expiresAt: string
}
function isCallbackChannel(value: unknown): value is CallbackChannel {
Iif (!value || typeof value !== 'object') return false
const candidate = value as Record<string, unknown>
return typeof candidate.channel === 'string' && typeof candidate.service === 'string'
}
function isTransactionHandoff(value: unknown): value is TransactionHandoff {
Iif (!value || typeof value !== 'object') return false
const candidate = value as Record<string, unknown>
return (
candidate.version === 1 &&
typeof candidate.returnUrl === 'string' &&
isCallbackChannel(candidate.callback) &&
typeof candidate.transactionId === 'string' &&
typeof candidate.chainId === 'string' &&
typeof candidate.actor === 'string' &&
typeof candidate.permission === 'string' &&
typeof candidate.expiresAt === 'string'
)
}
/** Check whether returnUrl differs from currentUrl only by a non-empty fragment. */
export function isSamePageReturn(returnUrl: string, currentUrl = window.location.href): boolean {
const current = new URL(currentUrl)
const target = new URL(returnUrl, current)
const targetHash = target.hash
current.hash = ''
target.hash = ''
return targetHash.length > 1 && current.href === target.href
}
/** Resolve once the page returns from an app handoff: the return hash arrives or the page is re-shown. */
export function waitForPageReturn(
returnUrl: string,
signal?: AbortSignal,
pageWindow: Window = window,
pageDocument: Document = document
): Promise<void> {
const expectedHash = new URL(returnUrl, pageWindow.location.href).hash
let departed = pageDocument.visibilityState === 'hidden'
return new Promise<void>((resolve, reject) => {
const cleanup = () => {
pageWindow.removeEventListener('hashchange', onHashChange)
pageWindow.removeEventListener('pagehide', onPageHide)
pageWindow.removeEventListener('pageshow', onPageShow)
pageDocument.removeEventListener('visibilitychange', onVisibilityChange)
signal?.removeEventListener('abort', onAbort)
}
const finish = () => {
cleanup()
resolve()
}
const onHashChange = () => {
if (expectedHash && pageWindow.location.hash === expectedHash) finish()
}
const onPageHide = () => {
departed = true
}
const onPageShow = () => {
if (departed) finish()
}
const onVisibilityChange = () => {
if (pageDocument.visibilityState === 'hidden') {
departed = true
} else if (departed) {
finish()
}
}
const onAbort = () => {
cleanup()
reject(new Error('Transaction callback wait cancelled'))
}
pageWindow.addEventListener('hashchange', onHashChange)
pageWindow.addEventListener('pagehide', onPageHide)
pageWindow.addEventListener('pageshow', onPageShow)
pageDocument.addEventListener('visibilitychange', onVisibilityChange)
signal?.addEventListener('abort', onAbort, {once: true})
Iif (signal?.aborted) onAbort()
})
}
export function storeTransactionHandoff(
handoff: TransactionHandoff,
storage: Storage = window.localStorage
): void {
storage.setItem(TRANSACTION_HANDOFF_KEY, JSON.stringify(handoff))
}
export function findReturnedTransactionHandoff(
currentUrl = window.location.href,
now = Date.now(),
storage: Storage = window.localStorage
): TransactionHandoff | null {
const encoded = storage.getItem(TRANSACTION_HANDOFF_KEY)
if (!encoded) return null
let handoff: unknown
try {
handoff = JSON.parse(encoded)
} catch {
storage.removeItem(TRANSACTION_HANDOFF_KEY)
return null
}
if (!isTransactionHandoff(handoff)) {
storage.removeItem(TRANSACTION_HANDOFF_KEY)
return null
}
const expiresAt = Date.parse(handoff.expiresAt)
if (!Number.isFinite(expiresAt) || expiresAt <= now) {
storage.removeItem(TRANSACTION_HANDOFF_KEY)
return null
}
try {
return new URL(currentUrl).href === new URL(handoff.returnUrl).href ? handoff : null
} catch {
storage.removeItem(TRANSACTION_HANDOFF_KEY)
return null
}
}
export function clearTransactionHandoff(
handoff: TransactionHandoff,
storage: Storage = window.localStorage
): void {
const current = findReturnedTransactionHandoff(handoff.returnUrl, 0, storage)
if (current?.returnUrl === handoff.returnUrl) {
storage.removeItem(TRANSACTION_HANDOFF_KEY)
}
}
/** Receive the buffered signed transaction for a stored handoff, or null when none matches the current URL. */
export function receiveReturnedTransaction(options: {
currentUrl?: string
now?: number
storage?: Storage
WebSocket?: typeof WebSocket
/** @internal */
receive?: typeof receive
abiProvider: AbiProvider
}): Cancelable<SignedTransaction> | null {
const storage = options.storage ?? window.localStorage
const now = options.now ?? Date.now()
const handoff = findReturnedTransactionHandoff(options.currentUrl, now, storage)
if (!handoff) return null
const ctx: ReceiveContext = {}
const pending = (options.receive ?? receive)(
{
...handoff.callback,
WebSocket: options.WebSocket ?? WebSocket,
timeout: Math.max(1, Date.parse(handoff.expiresAt) - now),
},
ctx
)
const transaction = pending
.then(async (response) => {
Iif (typeof response !== 'string') {
throw new Error('Anchor did not return a signed transaction')
}
const payload: CallbackPayload = JSON.parse(response)
const signatures = extractSignaturesFromCallback(payload)
Iif (!isCallback(payload) || signatures.length === 0) {
throw new Error('Anchor did not return a signed transaction')
}
const resolved = await ResolvedSigningRequest.fromPayload(payload, {
zlib,
abiProvider: options.abiProvider,
})
if (
String(resolved.transaction.id) !== handoff.transactionId ||
String(resolved.chainId) !== handoff.chainId ||
String(resolved.signer.actor) !== handoff.actor ||
String(resolved.signer.permission) !== handoff.permission
) {
throw new Error('Anchor returned a different transaction')
}
return SignedTransaction.from({
...resolved.transaction,
signatures,
})
})
.finally(() => clearTransactionHandoff(handoff, storage)) as Cancelable<SignedTransaction>
transaction.cancel = () => {
ctx.cancel?.()
return transaction
}
return transaction
}
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