import padEnd from 'lodash/padEnd';
import xdr from '../generated/stellar-xdr_generated';
import { Keypair } from '../keypair';
import { StrKey } from '../strkey';
/**
* Returns an XDR AllowTrustOp. An "allow trust" operation authorizes another
* account to hold your account's credit for a given asset.
* @function
* @alias Operation.allowTrust
* @param {object} opts Options object
* @param {string} opts.trustor - The trusting account (the one being authorized)
* @param {string} opts.assetCode - The asset code being authorized.
* @param {boolean} opts.authorize - True to authorize the line, false to deauthorize.
* @param {string} [opts.source] - The source account (defaults to transaction source).
* @returns {xdr.AllowTrustOp} Allow Trust operation
*/
export function allowTrust(opts) {
if (!StrKey.isValidEd25519PublicKey(opts.trustor)) {
throw new Error('trustor is invalid');
}
const attributes = {};
attributes.trustor = Keypair.fromPublicKey(opts.trustor).xdrAccountId();
if (opts.assetCode.length <= 4) {
const code = padEnd(opts.assetCode, 4, '\0');
attributes.asset = xdr.AllowTrustOpAsset.assetTypeCreditAlphanum4(code);
} else if (opts.assetCode.length <= 12) {
const code = padEnd(opts.assetCode, 12, '\0');
attributes.asset = xdr.AllowTrustOpAsset.assetTypeCreditAlphanum12(code);
} else {
throw new Error('Asset code must be 12 characters at max.');
}
attributes.authorize = opts.authorize;
const allowTrustOp = new xdr.AllowTrustOp(attributes);
const opAttributes = {};
opAttributes.body = xdr.OperationBody.allowTrust(allowTrustOp);
this.setSourceAccount(opAttributes, opts);
return new xdr.Operation(opAttributes);
}