/
arc12.algo.ts
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/
arc12.algo.ts
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/* eslint-disable no-undef */
/* eslint-disable max-classes-per-file */
// eslint-disable-next-line import/no-unresolved, import/extensions
import { Contract } from '@algorandfoundation/tealscript';
class ControlledAddress extends Contract {
@allow.create('DeleteApplication')
new(): Address {
sendPayment({
rekeyTo: this.txn.sender,
});
return this.app.address;
}
}
export class ARC12 extends Contract {
vaults = BoxMap<Address, Address>();
/**
* Opt the ARC12 router into the ASA. This is required before this app can be used to send the ASA to anyone.
*
* @param asa The ASA to opt into
*/
optRouterIn(asa: AssetID): void {
sendAssetTransfer({
assetReceiver: this.app.address,
assetAmount: 0,
xferAsset: asa,
});
}
/**
* Gets an existing or create a vault for the given address
*/
private getOrCreateVault(addr: Address): Address {
if (this.vaults(addr).exists) return this.vaults(addr).value;
const vault = sendMethodCall<typeof ControlledAddress.prototype.new>({
onCompletion: OnCompletion.DeleteApplication,
approvalProgram: ControlledAddress.approvalProgram(),
clearStateProgram: ControlledAddress.clearProgram(),
});
this.vaults(addr).value = vault;
return vault;
}
/**
*
* @param receiver The address to send the asset to
* @param asset The asset to send
*
* @returns The number of itxns sent and the MBR required to send the asset to the receiver
*/
getAssetSendInfo(receiver: Address, asset: AssetID): { itxns: uint64; mbr: uint64 } {
const info: { itxns: uint64; mbr: uint64 } = { itxns: 1, mbr: 0 };
if (receiver.isOptedInToAsset(asset)) return info;
if (!this.vaults(receiver).exists) {
// Two itxns to create vault (create + rekey)
// One itxns to send MBR
// One itxn to opt in
info.itxns += 4;
// Calculate the MBR for the vault box
const preMBR = globals.currentApplicationAddress.minBalance;
this.vaults(receiver).value = globals.zeroAddress;
const boxMbrDelta = globals.currentApplicationAddress.minBalance - preMBR;
this.vaults(receiver).delete();
// MBR = MBR for the box + min balance for the vault + ASA MBR
info.mbr = boxMbrDelta + globals.minBalance + globals.assetOptInMinBalance;
return info;
}
const vault = this.vaults(receiver).value;
if (!vault.isOptedInToAsset(asset)) {
// One itxn to opt in
info.itxns += 1;
if (!(vault.balance >= vault.minBalance + globals.assetOptInMinBalance)) {
// One itxn to send MBR
info.itxns += 1;
// MBR = ASA MBR
info.mbr = globals.assetOptInMinBalance;
}
}
return info;
}
/**
* Send an asset to the receiver
*
* @param receiver The address to send the asset to
* @param axfer The asset transfer to this app
*
* @returns The address that the asset was sent to (either the receiver or their vault)
*/
sendAsset(axfer: AssetTransferTxn, receiver: Address): Address {
verifyAssetTransferTxn(axfer, {
assetReceiver: this.app.address,
});
// If the receiver is opted in, send directly to their account
if (receiver.isOptedInToAsset(axfer.xferAsset)) {
sendAssetTransfer({
assetReceiver: receiver,
assetAmount: axfer.assetAmount,
xferAsset: axfer.xferAsset,
});
return receiver;
}
const vaultExisted = this.vaults(receiver).exists;
const vault = this.getOrCreateVault(receiver);
if (!vault.isOptedInToAsset(axfer.xferAsset)) {
let vaultMbrDelta = globals.assetOptInMinBalance;
if (!vaultExisted) vaultMbrDelta += globals.minBalance;
// Ensure the vault has enough balance to opt in
if (vault.balance < vault.minBalance + vaultMbrDelta) {
sendPayment({
receiver: vault,
amount: vaultMbrDelta,
});
}
// Opt the vault in
sendAssetTransfer({
sender: vault,
assetReceiver: vault,
assetAmount: 0,
xferAsset: axfer.xferAsset,
});
}
// Transfer the asset to the vault
sendAssetTransfer({
assetReceiver: vault,
assetAmount: axfer.assetAmount,
xferAsset: axfer.xferAsset,
});
return vault;
}
/**
* Claim an ASA from the vault
*
* @param asa The ASA to claim
*/
claim(asa: AssetID): void {
const vault = this.vaults(this.txn.sender).value;
const preMBR = vault.minBalance;
sendAssetTransfer({
sender: vault,
assetReceiver: this.txn.sender,
assetAmount: vault.assetBalance(asa),
xferAsset: asa,
assetCloseTo: this.txn.sender,
});
sendPayment({
sender: vault,
receiver: this.txn.sender,
amount: preMBR - vault.minBalance,
});
}
/**
* Burn the ASA from the vault with ARC54
*
* @param asa The ASA to burn
* @param arc54App The ARC54 app to burn the ASA to
*/
burn(asa: AssetID, arc54App: AppID) {
const vault = this.vaults(this.txn.sender).value;
// opt the arc54 app into the ASA if not already opted in
if (!arc54App.address.isOptedInToAsset(asa)) {
sendPayment({
receiver: arc54App.address,
amount: globals.assetOptInMinBalance,
});
sendMethodCall<[AssetReference], void>({
sender: vault,
name: 'arc54_optIntoASA',
methodArgs: [asa],
applicationID: arc54App,
});
}
const preMBR = vault.minBalance;
sendAssetTransfer({
sender: vault,
assetReceiver: arc54App.address,
assetAmount: vault.assetBalance(asa),
xferAsset: asa,
assetCloseTo: arc54App.address,
});
sendPayment({
sender: vault,
receiver: this.txn.sender,
amount: preMBR - vault.minBalance,
});
}
}