@uniswap/v4-sdk/dist/esm/src/utils/hook.js

⚒️ An SDK for building applications on top of Uniswap V4

import invariant from 'tiny-invariant';
import { isAddress } from 'ethers/lib/utils';
export var HookOptions;
(function (HookOptions) {
    HookOptions["AfterRemoveLiquidityReturnsDelta"] = "afterRemoveLiquidityReturnsDelta";
    HookOptions["AfterAddLiquidityReturnsDelta"] = "afterAddLiquidityReturnsDelta";
    HookOptions["AfterSwapReturnsDelta"] = "afterSwapReturnsDelta";
    HookOptions["BeforeSwapReturnsDelta"] = "beforeSwapReturnsDelta";
    HookOptions["AfterDonate"] = "afterDonate";
    HookOptions["BeforeDonate"] = "beforeDonate";
    HookOptions["AfterSwap"] = "afterSwap";
    HookOptions["BeforeSwap"] = "beforeSwap";
    HookOptions["AfterRemoveLiquidity"] = "afterRemoveLiquidity";
    HookOptions["BeforeRemoveLiquidity"] = "beforeRemoveLiquidity";
    HookOptions["AfterAddLiquidity"] = "afterAddLiquidity";
    HookOptions["BeforeAddLiquidity"] = "beforeAddLiquidity";
    HookOptions["AfterInitialize"] = "afterInitialize";
    HookOptions["BeforeInitialize"] = "beforeInitialize";
})(HookOptions || (HookOptions = {}));
export const hookFlagIndex = {
    [HookOptions.AfterRemoveLiquidityReturnsDelta]: 0,
    [HookOptions.AfterAddLiquidityReturnsDelta]: 1,
    [HookOptions.AfterSwapReturnsDelta]: 2,
    [HookOptions.BeforeSwapReturnsDelta]: 3,
    [HookOptions.AfterDonate]: 4,
    [HookOptions.BeforeDonate]: 5,
    [HookOptions.AfterSwap]: 6,
    [HookOptions.BeforeSwap]: 7,
    [HookOptions.AfterRemoveLiquidity]: 8,
    [HookOptions.BeforeRemoveLiquidity]: 9,
    [HookOptions.AfterAddLiquidity]: 10,
    [HookOptions.BeforeAddLiquidity]: 11,
    [HookOptions.AfterInitialize]: 12,
    [HookOptions.BeforeInitialize]: 13,
};
export class Hook {
    static permissions(address) {
        this._checkAddress(address);
        return {
            beforeInitialize: this._hasPermission(address, HookOptions.BeforeInitialize),
            afterInitialize: this._hasPermission(address, HookOptions.AfterInitialize),
            beforeAddLiquidity: this._hasPermission(address, HookOptions.BeforeAddLiquidity),
            afterAddLiquidity: this._hasPermission(address, HookOptions.AfterAddLiquidity),
            beforeRemoveLiquidity: this._hasPermission(address, HookOptions.BeforeRemoveLiquidity),
            afterRemoveLiquidity: this._hasPermission(address, HookOptions.AfterRemoveLiquidity),
            beforeSwap: this._hasPermission(address, HookOptions.BeforeSwap),
            afterSwap: this._hasPermission(address, HookOptions.AfterSwap),
            beforeDonate: this._hasPermission(address, HookOptions.BeforeDonate),
            afterDonate: this._hasPermission(address, HookOptions.AfterDonate),
            beforeSwapReturnsDelta: this._hasPermission(address, HookOptions.BeforeSwapReturnsDelta),
            afterSwapReturnsDelta: this._hasPermission(address, HookOptions.AfterSwapReturnsDelta),
            afterAddLiquidityReturnsDelta: this._hasPermission(address, HookOptions.AfterAddLiquidityReturnsDelta),
            afterRemoveLiquidityReturnsDelta: this._hasPermission(address, HookOptions.AfterRemoveLiquidityReturnsDelta),
        };
    }
    static hasPermission(address, hookOption) {
        this._checkAddress(address);
        return this._hasPermission(address, hookOption);
    }
    static hasInitializePermissions(address) {
        this._checkAddress(address);
        return (this._hasPermission(address, HookOptions.BeforeInitialize) ||
            Hook._hasPermission(address, HookOptions.AfterInitialize));
    }
    static hasLiquidityPermissions(address) {
        this._checkAddress(address);
        // this implicitly encapsulates liquidity delta permissions
        return (this._hasPermission(address, HookOptions.BeforeAddLiquidity) ||
            Hook._hasPermission(address, HookOptions.AfterAddLiquidity) ||
            Hook._hasPermission(address, HookOptions.BeforeRemoveLiquidity) ||
            Hook._hasPermission(address, HookOptions.AfterRemoveLiquidity));
    }
    static hasSwapPermissions(address) {
        this._checkAddress(address);
        // this implicitly encapsulates swap delta permissions
        return this._hasPermission(address, HookOptions.BeforeSwap) || Hook._hasPermission(address, HookOptions.AfterSwap);
    }
    static hasDonatePermissions(address) {
        this._checkAddress(address);
        return (this._hasPermission(address, HookOptions.BeforeDonate) || Hook._hasPermission(address, HookOptions.AfterDonate));
    }
    static _hasPermission(address, hookOption) {
        // Use only the last 4 bytes (32 bits) to avoid JavaScript precision issues
        // All hook flags are in bits 0-13, which fit comfortably in 32 bits
        const last4Bytes = '0x' + address.slice(-8);
        return !!(parseInt(last4Bytes, 16) & (1 << hookFlagIndex[hookOption]));
    }
    static _checkAddress(address) {
        invariant(isAddress(address), 'invalid address');
    }
}
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