# All files / src/tx/applyTx checkExit.js

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     /**
     * Copyright (c) 2018-present, Leap DAO (leapdao.org)
     *
     * This source code is licensed under the Mozilla Public License Version 2.0
     * found in the LICENSE file in the root directory of this source tree.
     */

    const { Type } = require('leap-core');
    const { BigInt, equal } = require('jsbi-utils');
    const { addrCmp } = require('../../utils');

    module.exports = (state, tx, bridgeState) => {
      if (tx.type !== Type.EXIT) {
        throw new Error('Exit tx expected');
      }

      if (tx.inputs.length !== 1) {
        throw new Error('Exit tx should have one input');
      }

      const [{ prevout }] = tx.inputs;
      const unspent = state.unspent[prevout.hex()];
      const exit = bridgeState.exits[prevout.getUtxoId()];
      if (
        !unspent ||
        !exit ||
        !addrCmp(exit.exitor, unspent.address) ||
        !equal(BigInt(exit.amount), BigInt(unspent.value)) ||
        Number(exit.color) !== unspent.color
      ) {
        throw new Error('Trying to submit incorrect exit');
      }
    };