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feat(ur-sdk): add command parser (#127)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| import { ethers } from 'ethers' | ||
| import { abi } from '@uniswap/universal-router/artifacts/contracts/UniversalRouter.sol/UniversalRouter.json' | ||
| import { Interface } from '@ethersproject/abi' | ||
| import { CommandType, COMMAND_ABI_DEFINITION, Subparser } from '../utils/routerCommands' | ||
|
|
||
| export type Param = { | ||
| readonly name: string | ||
| readonly value: any | ||
| } | ||
|
|
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| export type UniversalRouterCommand = { | ||
| readonly commandName: string | ||
| readonly commandType: CommandType | ||
| readonly params: readonly Param[] | ||
| } | ||
|
|
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| export type UniversalRouterCall = { | ||
| readonly commands: readonly UniversalRouterCommand[] | ||
| } | ||
|
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| export type V3PathItem = { | ||
| readonly tokenIn: string | ||
| readonly tokenOut: string | ||
| readonly fee: number | ||
| } | ||
|
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| // Parses UniversalRouter commands | ||
| export abstract class CommandParser { | ||
| public static INTERFACE: Interface = new Interface(abi) | ||
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| public static parseCalldata(calldata: string): UniversalRouterCall { | ||
| const txDescription = CommandParser.INTERFACE.parseTransaction({ data: calldata }) | ||
| const { commands, inputs } = txDescription.args | ||
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| const commandTypes = CommandParser.getCommands(commands) | ||
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| return { | ||
| commands: commandTypes.map((commandType: CommandType, i: number) => { | ||
| const abiDef = COMMAND_ABI_DEFINITION[commandType] | ||
| const rawParams = ethers.utils.defaultAbiCoder.decode( | ||
| abiDef.map((command) => command.type), | ||
| inputs[i] | ||
| ) | ||
| const params = rawParams.map((param: any, j: number) => { | ||
| switch (abiDef[j].subparser) { | ||
| case Subparser.V3PathExactIn: | ||
| return { | ||
| name: abiDef[j].name, | ||
| value: parseV3PathExactIn(param), | ||
| } | ||
| case Subparser.V3PathExactOut: | ||
| return { | ||
| name: abiDef[j].name, | ||
| value: parseV3PathExactOut(param), | ||
| } | ||
| default: | ||
| return { | ||
| name: abiDef[j].name, | ||
| value: param, | ||
| } | ||
| } | ||
| }) | ||
|
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||
| return { | ||
| commandName: CommandType[commandType], | ||
| commandType, | ||
| params, | ||
| } | ||
| }), | ||
| } | ||
| } | ||
|
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| // parse command types from bytes string | ||
| private static getCommands(commands: string): CommandType[] { | ||
| const commandTypes = [] | ||
|
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| for (let i = 2; i < commands.length; i += 2) { | ||
| const byte = commands.substring(i, i + 2) | ||
| commandTypes.push(parseInt(byte, 16) as CommandType) | ||
| } | ||
|
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| return commandTypes | ||
| } | ||
| } | ||
|
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| export function parseV3PathExactIn(path: string): readonly V3PathItem[] { | ||
| const strippedPath = path.replace('0x', '') | ||
| let tokenIn = ethers.utils.getAddress(strippedPath.substring(0, 40)) | ||
| let loc = 40 | ||
| const res = [] | ||
| while (loc < strippedPath.length) { | ||
| const feeAndTokenOut = strippedPath.substring(loc, loc + 46) | ||
| const fee = parseInt(feeAndTokenOut.substring(0, 6), 16) | ||
| const tokenOut = ethers.utils.getAddress(feeAndTokenOut.substring(6, 46)) | ||
|
|
||
| res.push({ | ||
| tokenIn, | ||
| tokenOut, | ||
| fee, | ||
| }) | ||
| tokenIn = tokenOut | ||
| loc += 46 | ||
| } | ||
|
|
||
| return res | ||
| } | ||
|
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| export function parseV3PathExactOut(path: string): readonly V3PathItem[] { | ||
| const strippedPath = path.replace('0x', '') | ||
| let tokenIn = ethers.utils.getAddress(strippedPath.substring(strippedPath.length - 40)) | ||
| let loc = strippedPath.length - 86 // 86 = (20 addr + 3 fee + 20 addr) * 2 (for hex characters) | ||
| const res = [] | ||
| while (loc >= 0) { | ||
| const feeAndTokenOut = strippedPath.substring(loc, loc + 46) | ||
| const tokenOut = ethers.utils.getAddress(feeAndTokenOut.substring(0, 40)) | ||
| const fee = parseInt(feeAndTokenOut.substring(40, 46), 16) | ||
|
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| res.push({ | ||
| tokenIn, | ||
| tokenOut, | ||
| fee, | ||
| }) | ||
| tokenIn = tokenOut | ||
|
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| loc -= 46 | ||
| } | ||
|
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||
| return res | ||
| } |
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