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tokenBridge.ts
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tokenBridge.ts
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import { BN } from "@project-serum/anchor";
import { ParsedGovernanceVaa, parseGovernanceVaa } from "./governance";
import { ParsedVaa, parseVaa, SignedVaa } from "./wormhole";
export enum TokenBridgePayload {
Transfer = 1,
AttestMeta,
TransferWithPayload,
}
export enum TokenBridgeGovernanceAction {
RegisterChain = 1,
UpgradeContract = 2,
}
export interface TokenTransfer {
payloadType:
| TokenBridgePayload.Transfer
| TokenBridgePayload.TransferWithPayload;
amount: bigint;
tokenAddress: Buffer;
tokenChain: number;
to: Buffer;
toChain: number;
fee: bigint | null;
fromAddress: Buffer | null;
tokenTransferPayload: Buffer;
}
export function parseTokenTransferPayload(payload: Buffer): TokenTransfer {
const payloadType = payload.readUInt8(0);
if (
payloadType != TokenBridgePayload.Transfer &&
payloadType != TokenBridgePayload.TransferWithPayload
) {
throw new Error("not token bridge transfer VAA");
}
const amount = BigInt(new BN(payload.subarray(1, 33)).toString());
const tokenAddress = payload.subarray(33, 65);
const tokenChain = payload.readUInt16BE(65);
const to = payload.subarray(67, 99);
const toChain = payload.readUInt16BE(99);
const fee =
payloadType == 1
? BigInt(new BN(payload.subarray(101, 133)).toString())
: null;
const fromAddress = payloadType == 3 ? payload.subarray(101, 133) : null;
const tokenTransferPayload = payload.subarray(133);
return {
payloadType,
amount,
tokenAddress,
tokenChain,
to,
toChain,
fee,
fromAddress,
tokenTransferPayload,
};
}
export interface ParsedTokenTransferVaa extends ParsedVaa, TokenTransfer {}
export function parseTokenTransferVaa(vaa: SignedVaa): ParsedTokenTransferVaa {
const parsed = parseVaa(vaa);
return {
...parsed,
...parseTokenTransferPayload(parsed.payload),
};
}
export interface AssetMeta {
payloadType: TokenBridgePayload.AttestMeta;
tokenAddress: Buffer;
tokenChain: number;
decimals: number;
symbol: string;
name: string;
}
export function parseAttestMetaPayload(payload: Buffer): AssetMeta {
const payloadType = payload.readUInt8(0);
if (payloadType != TokenBridgePayload.AttestMeta) {
throw new Error("not token bridge attest meta VAA");
}
const tokenAddress = payload.subarray(1, 33);
const tokenChain = payload.readUInt16BE(33);
const decimals = payload.readUInt8(35);
const symbol = payload.subarray(36, 68).toString().replace(/\0/g, "");
const name = payload.subarray(68, 100).toString().replace(/\0/g, "");
return {
payloadType,
tokenAddress,
tokenChain,
decimals,
symbol,
name,
};
}
export interface ParsedAssetMetaVaa extends ParsedVaa, AssetMeta {}
export type ParsedAttestMetaVaa = ParsedAssetMetaVaa;
export function parseAttestMetaVaa(vaa: SignedVaa): ParsedAssetMetaVaa {
const parsed = parseVaa(vaa);
return {
...parsed,
...parseAttestMetaPayload(parsed.payload),
};
}
export interface TokenBridgeRegisterChain {
foreignChain: number;
foreignAddress: Buffer;
}
export function parseTokenBridgeRegisterChainGovernancePayload(
payload: Buffer
): TokenBridgeRegisterChain {
const foreignChain = payload.readUInt16BE(0);
const foreignAddress = payload.subarray(2, 34);
return {
foreignChain,
foreignAddress,
};
}
export interface ParsedTokenBridgeRegisterChainVaa
extends ParsedGovernanceVaa,
TokenBridgeRegisterChain {}
export function parseTokenBridgeRegisterChainVaa(
vaa: SignedVaa
): ParsedTokenBridgeRegisterChainVaa {
const parsed = parseGovernanceVaa(vaa);
if (parsed.action != TokenBridgeGovernanceAction.RegisterChain) {
throw new Error(
"parsed.action != TokenBridgeGovernanceAction.RegisterChain"
);
}
return {
...parsed,
...parseTokenBridgeRegisterChainGovernancePayload(parsed.orderPayload),
};
}
export interface TokenBridgeUpgradeContract {
newContract: Buffer;
}
export function parseTokenBridgeUpgradeContractGovernancePayload(
payload: Buffer
): TokenBridgeUpgradeContract {
const newContract = payload.subarray(0, 32);
return {
newContract,
};
}
export interface ParsedTokenBridgeUpgradeContractVaa
extends ParsedGovernanceVaa,
TokenBridgeUpgradeContract {}
export function parseTokenBridgeUpgradeContractVaa(
vaa: SignedVaa
): ParsedTokenBridgeUpgradeContractVaa {
const parsed = parseGovernanceVaa(vaa);
if (parsed.action != TokenBridgeGovernanceAction.UpgradeContract) {
throw new Error(
"parsed.action != TokenBridgeGovernanceAction.UpgradeContract"
);
}
return {
...parsed,
...parseTokenBridgeUpgradeContractGovernancePayload(parsed.orderPayload),
};
}