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import { Script, Transaction, TransactionInput } from "@bsv/sdk"
import { asBsvSdkScript, makeAtomicBeef, PendingSignAction, PendingStorageInput, ScriptTemplateSABPPP, sdk, verifyId, verifyTruthy, WalletSigner } from "../../index.client"
export async function createAction(signer: WalletSigner, auth: sdk.AuthId, vargs: sdk.ValidCreateActionArgs)
: Promise<CreateActionResult>
{
const r: CreateActionResult = {}
let prior: PendingSignAction | undefined = undefined
if (vargs.isNewTx) {
prior = await createNewTx(signer, vargs)
if (vargs.isSignAction) {
return makeSignableTransactionResult(prior, signer, vargs)
}
prior.tx = await completeSignedTransaction(prior, {}, signer)
r.txid = prior.tx.id('hex')
r.noSendChange = prior.dcr.noSendChangeOutputVouts?.map(vout => `${r.txid}.${vout}`)
if (!vargs.options.returnTXIDOnly)
r.tx = makeAtomicBeef(prior.tx, prior.dcr.inputBeef!)
}
r.sendWithResults = await processAction(prior, signer, auth, vargs)
return r
}
async function createNewTx(signer: WalletSigner, args: sdk.ValidCreateActionArgs)
: Promise<PendingSignAction>
{
const storageArgs = removeUnlockScripts(args);
const dcr = await signer.storage.createAction(storageArgs)
const reference = dcr.reference
const { tx, amount, pdi } = buildSignableTransaction(dcr, args, signer)
const prior: PendingSignAction = { reference, dcr, args, amount, tx, pdi }
return prior
}
function makeSignableTransactionResult(prior: PendingSignAction, signer: WalletSigner, args: sdk.ValidCreateActionArgs)
: CreateActionResult
{
Iif (!prior.dcr.inputBeef)
throw new sdk.WERR_INTERNAL('prior.dcr.inputBeef must be valid')
const txid = prior.tx.id('hex')
const r: CreateActionResult = {
noSendChange: args.isNoSend ? prior.dcr.noSendChangeOutputVouts?.map(vout => `${txid}.${vout}`) : undefined,
signableTransaction: {
reference: prior.dcr.reference,
tx: makeAtomicBeef(prior.tx, prior.dcr.inputBeef)
}
}
signer.pendingSignActions[r.signableTransaction!.reference] = prior
return r
}
/**
* Derive a change output locking script
*/
function makeChangeLock(
out: sdk.StorageCreateTransactionSdkOutput,
dctr: sdk.StorageCreateActionResult,
args: sdk.ValidCreateActionArgs,
changeKeys: sdk.KeyPair,
signer: WalletSigner)
: Script
{
const derivationPrefix = dctr.derivationPrefix
const derivationSuffix = verifyTruthy(out.derivationSuffix);
const sabppp = new ScriptTemplateSABPPP({ derivationPrefix, derivationSuffix, keyDeriver: signer.keyDeriver });
const lockingScript = sabppp.lock(changeKeys.privateKey, changeKeys.publicKey)
return lockingScript
}
export async function completeSignedTransaction(
prior: PendingSignAction,
spends: Record<number, SignActionSpend>,
signer: WalletSigner,
)
: Promise<Transaction>
{
/////////////////////
// Insert the user provided unlocking scripts from "spends" arg
/////////////////////
for (const [key, spend] of Object.entries(spends)) {
const vin = Number(key)
const createInput = prior.args.inputs[vin]
const input = prior.tx.inputs[vin]
Iif (!createInput || !input || createInput.unlockingScript || !Number.isInteger(createInput.unlockingScriptLength))
throw new sdk.WERR_INVALID_PARAMETER('args', `spend does not correspond to prior input with valid unlockingScriptLength.`)
Iif (spend.unlockingScript.length / 2 > createInput.unlockingScriptLength!)
throw new sdk.WERR_INVALID_PARAMETER('args', `spend unlockingScript length ${spend.unlockingScript.length} exceeds expected length ${createInput.unlockingScriptLength}`)
input.unlockingScript = asBsvSdkScript(spend.unlockingScript)
Iif (spend.sequenceNumber !== undefined)
input.sequence = spend.sequenceNumber
}
const results = {
sdk: <SignActionResult>{}
}
/////////////////////
// Insert SABPPP unlock templates for storage signed inputs
/////////////////////
for (const pdi of prior.pdi) {
const sabppp = new ScriptTemplateSABPPP({
derivationPrefix: pdi.derivationPrefix,
derivationSuffix: pdi.derivationSuffix,
keyDeriver: signer.keyDeriver
})
const keys = signer.getClientChangeKeyPair()
const lockerPrivKey = keys.privateKey
const unlockerPubKey = pdi.unlockerPubKey || keys.publicKey
const sourceSatoshis = pdi.sourceSatoshis
const lockingScript = asBsvSdkScript(pdi.lockingScript)
const unlockTemplate = sabppp.unlock(lockerPrivKey, unlockerPubKey, sourceSatoshis, lockingScript)
const input = prior.tx.inputs[pdi.vin]
input.unlockingScriptTemplate = unlockTemplate
}
/////////////////////
// Sign storage signed inputs making transaction fully valid.
/////////////////////
await prior.tx.sign()
return prior.tx
}
function removeUnlockScripts(args: sdk.ValidCreateActionArgs) {
let storageArgs = args
Iif (!storageArgs.inputs.every(i => i.unlockingScript === undefined)) {
// Never send unlocking scripts to storage, all it needs is the script length.
storageArgs = { ...args, inputs: [] };
for (const i of args.inputs) {
const di: sdk.ValidCreateActionInput = {
...i,
unlockingScriptLength: i.unlockingScript !== undefined ? i.unlockingScript.length : i.unlockingScriptLength
};
delete di.unlockingScript;
storageArgs.inputs.push(di);
}
}
return storageArgs;
}
export async function processAction(prior: PendingSignAction | undefined, signer: WalletSigner, auth: sdk.AuthId, vargs: sdk.ValidProcessActionArgs)
: Promise<SendWithResult[] | undefined>
{
const args: sdk.StorageProcessActionArgs = {
isNewTx: vargs.isNewTx,
isSendWith: vargs.isSendWith,
isNoSend: vargs.isNoSend,
isDelayed: vargs.isDelayed,
reference: prior ? prior.reference : undefined,
txid: prior ? prior.tx.id('hex') : undefined,
rawTx: prior ? prior.tx.toBinary() : undefined,
sendWith: vargs.isSendWith ? vargs.options.sendWith : [],
}
const r: sdk.StorageProcessActionResults = await signer.storage.processAction(args)
return r.sendWithResults
}
function buildSignableTransaction(
dctr: sdk.StorageCreateActionResult,
args: sdk.ValidCreateActionArgs,
signer: WalletSigner
)
: { tx: Transaction, amount: number, pdi: PendingStorageInput[], log: string }
{
const changeKeys = signer.getClientChangeKeyPair()
const {
inputs: storageInputs,
outputs: storageOutputs,
} = dctr;
const tx = new Transaction(args.version, [], [], args.lockTime);
// The order of outputs in storageOutputs is always:
// CreateActionArgs.outputs in the original order
// Commission output
// Change outputs
// The Vout values will be randomized if args.options.randomizeOutputs is true. Default is true.
const voutToIndex = Array<number>(storageOutputs.length)
for (let vout = 0; vout < storageOutputs.length; vout++) {
const i = storageOutputs.findIndex(o => o.vout === vout)
Iif (i < 0)
throw new sdk.WERR_INVALID_PARAMETER('output.vout', `sequential. ${vout} is missing`)
voutToIndex[vout] = i
}
//////////////
// Add OUTPUTS
/////////////
for (let vout = 0; vout < storageOutputs.length; vout++) {
const i = voutToIndex[vout]
const out = storageOutputs[i]
Iif (vout !== out.vout)
throw new sdk.WERR_INVALID_PARAMETER('output.vout', `equal to array index. ${out.vout} !== ${vout}`)
const change = out.providedBy === 'storage' && out.purpose === 'change'
const lockingScript = change ? makeChangeLock(out, dctr, args, changeKeys, signer) : asBsvSdkScript(out.lockingScript)
const output = {
satoshis: out.satoshis,
lockingScript,
change
}
tx.addOutput(output);
}
//////////////
// Merge and sort INPUTS info by vin order.
/////////////
const inputs: {
argsInput: sdk.ValidCreateActionInput | undefined,
storageInput: sdk.StorageCreateTransactionSdkInput,
}[] = []
for (const storageInput of storageInputs) {
const argsInput = (storageInput.vin !== undefined && storageInput.vin < args.inputs.length) ? args.inputs[storageInput.vin] : undefined
inputs.push({ argsInput, storageInput })
}
inputs.sort((a, b) => a.storageInput.vin! < b.storageInput.vin! ? -1 : a.storageInput.vin! === b.storageInput.vin! ? 0 : 1)
const pendingStorageInputs: PendingStorageInput[] = []
//////////////
// Add INPUTS
/////////////
let totalChangeInputs = 0
for (const { storageInput, argsInput } of inputs) {
// Two types of inputs are handled: user specified wth/without unlockingScript and storage specified using SABPPP template.
if (argsInput) {
// Type 1: User supplied input, with or without an explicit unlockingScript.
// If without, signAction must be used to provide the actual unlockScript.
const hasUnlock = typeof argsInput.unlockingScript === 'string'
const unlock = hasUnlock ? asBsvSdkScript(argsInput.unlockingScript!) : new Script()
const inputToAdd: TransactionInput = {
sourceTXID: argsInput.outpoint.txid,
sourceOutputIndex: argsInput.outpoint.vout,
unlockingScript: unlock,
sequence: argsInput.sequenceNumber
};
tx.addInput(inputToAdd);
} else {
// Type2: SABPPP protocol inputs which are signed using ScriptTemplateSABPPP.
Iif (storageInput.type !== 'P2PKH')
throw new sdk.WERR_INVALID_PARAMETER('type', `vin ${storageInput.vin}, "${storageInput.type}" is not a supported unlocking script type.`);
pendingStorageInputs.push({
vin: tx.inputs.length,
derivationPrefix: verifyTruthy(storageInput.derivationPrefix),
derivationSuffix: verifyTruthy(storageInput.derivationSuffix),
unlockerPubKey: storageInput.senderIdentityKey,
sourceSatoshis: storageInput.sourceSatoshis,
lockingScript: storageInput.sourceLockingScript
})
const inputToAdd: TransactionInput = {
sourceTXID: storageInput.sourceTxid,
sourceOutputIndex: storageInput.sourceVout,
unlockingScript: new Script(),
sequence: 0xffffffff
};
tx.addInput(inputToAdd);
totalChangeInputs += verifyTruthy(storageInput.sourceSatoshis);
}
}
// The amount is the total of non-foreign inputs minus change outputs
// Note that the amount can be negative when we are redeeming more inputs than we are spending
const totalChangeOutputs = storageOutputs.filter(x => x.purpose === 'change').reduce((acc, el) => acc + el.satoshis, 0);
const amount = totalChangeInputs - totalChangeOutputs;
return {
tx,
amount,
pdi: pendingStorageInputs,
log: ''
};
}
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