Using the password grant to connect to the Zendesk API in a Coda Pack

zendesk.ts

import * as coda from "@codahq/packs-sdk";
export const pack = coda.newPack();

const ClientId = "...";
const ClientSecret = "...";

pack.addNetworkDomain("zendesk.com");

pack.setUserAuthentication({
  type: coda.AuthenticationType.Custom,
  params: [
    {
      name: "username",
      description: "Username",
    },
    {
      name: "password",
      description: "Password",
    }
  ],
  requiresEndpointUrl: true
});

pack.addFormula({
  name: "UserName",
  description: "Gets the name of the authenticated user.",
  parameters: [],
  resultType: coda.ValueType.String,
  execute: async function (args, context) {
    // Use the Custom auth parameters to obtain an access token.
    let accessToken = await getAccessToken(context);

    // Make the API request using the access token.
    let response = await context.fetcher.fetch({
      method: "GET",
      url: "/api/v2/users/me",
      headers: {
        // Manually add the Authorization header.
        Authorization: `Bearer ${accessToken}`,
      },
      // Disable authentication, since the token was added manually.
      disableAuthentication: true,
    });
    let user = response.body.user;
    return user.name;
  },
});

async function getAccessToken(context: coda.ExecutionContext) {
  let invocationToken = context.invocationToken;
  let payload = {
    grant_type: "password",
    client_id: ClientId,
    client_secret: ClientSecret,
    scope: "read",
    // Pass the username and password using the Custom auth placeholder syntax.
    username: `{{username-${invocationToken}}}`,
    password: `{{password-${invocationToken}}}`,
  };
  let response = await context.fetcher.fetch({
    method: "POST",
    url: "/oauth/tokens",
    headers: {
      "Content-Type": "application/json",
    },
    body: JSON.stringify(payload),
  });
  let data = response.body;
  return data.access_token;
}