@agoric/zoe/src/contracts/loan/addCollateral.js

Zoe: the Smart Contract Framework for Offer Enforcement

import {
  assertProposalShape,
  atomicTransfer,
} from '../../contractSupport/index.js';

import { scheduleLiquidation } from './scheduleLiquidation.js';

// Create an invitation to add collateral to the loan. Part of the
// facet given to the borrower.

/** @type {MakeAddCollateralInvitation} */
export const makeAddCollateralInvitation = (zcf, config) => {
  const { collateralSeat } = config;

  /** @type {OfferHandler} */
  const addCollateral = addCollateralSeat => {
    assertProposalShape(addCollateralSeat, {
      give: { Collateral: null },
      want: {},
    });

    atomicTransfer(zcf, addCollateralSeat, collateralSeat, {
      Collateral: addCollateralSeat.getAmountAllocated('Collateral'),
    });

    addCollateralSeat.exit();

    // Schedule the new liquidation trigger. The old one will have an
    // outdated quote and will be ignored
    scheduleLiquidation(zcf, config);
    return 'a warm fuzzy feeling that you are further away from default than ever before';
  };

  return zcf.makeInvitation(addCollateral, 'addCollateral');
};