Usage

Example of signing a quote (creating a commitment).

There is no SDK for Message Bus API yet. But intents-sdk can be used to create intents

Example of how to create response for quote for market makers using TypeScript Here params has same type as what you receive from relay in "quote" event

params: {
  defuse_asset_identifier_in: string;
  defuse_asset_identifier_out: string;
  exact_amount_in: string | undefined;
  exact_amount_out: string | undefined;
  min_deadline_ms: number;
},

You can read more about versioned nonces here

import {VersionedNonceBuilder} from "@defuse-protocol/intents-sdk";

const generateNonce = async (deadline: Date): Promise<string> => {
  const account = await getAccount(); //function that will return Account instance(from "near-api-js") of market makers' Near account

  const salt_hex = await account.viewFunction({
    contractId: "intents.near",
    methodName: "current_salt",
  });

  let salt_bytes = Uint8Array.from(Buffer.from(salt_hex, "hex"));
  let versionedNonce = VersionedNonceBuilder.encodeNonce(salt_bytes, deadline);

  if (await isNonceUsed(versionedNonce)) {
    // this step can be skipped, but if the nonce is already used the quote won't be taken into account
    return generateNonce(deadline);
  } else {
    return versionedNonce;
  }
}

const isNonceUsed = async (nonce: string) => {
    const account = await getAccount();

    return await account.viewFunction({
      contractId: defuseContract,
      methodName: 'is_nonce_used',
      args: {
        account_id: account.accountId,
        nonce,
      },
    });
}

const getIntentPayload = async (
  sdk: IntentsSDK,
  deadline: Date,
  params: {
    defuse_asset_identifier_in: string;
    defuse_asset_identifier_out: string;
    exact_amount_in: string | undefined;
    exact_amount_out: string | undefined;
    min_deadline_ms: number;
  },
  amount: string
) => {
  let nonce = await generateNonce(deadline);

  return await sdk
    .intentBuilder()
    .setDeadline(deadline)
    .setNonce(nonce)
    .addIntent({
      intent: "token_diff",
      diff: {
        [params.defuse_asset_identifier_in]: !!params.exact_amount_in
          ? params.exact_amount_in
          : amount,
        [params.defuse_asset_identifier_out]: `-${
          !!params.exact_amount_out ? params.exact_amount_out : amount
        }`,
      },
    })
    .build();
};

import bs58 from 'bs58';

const amount = "1000" //calculated amount market maker want to propose
const deadline = new Date(Date.now() + 5 * 60 * 1000)

const intentSigner = createIntentSignerNearKeyPair({
  signer,
  accountId,
});

const sdk = new IntentsSDK({
  env: "production",
  referral: "your_referral",
  intentSigner: intentSigner,
});

const payload = await getIntentPayload(
  sdk,
  deadline,
  params
);

let signedPayload = await intentSigner.signIntent(payload);

const resp: IQuoteObject = {
  quote_id,
  quote_output: {},
  signed_data: signedPayload
};
if (!params.exact_amount_in) {
  resp.quote_output.amount_in = amount;
} else {
  resp.quote_output.amount_out = amount;
}