index.js

const AWS = require("aws-sdk");
const os = require("os");
const fs = require("fs");
const path = require("path");
const sha1 = require("sha1");

var iniLoader = AWS.util.iniLoader;

exports.SingleSignOnCredentials = AWS.SingleSignOnCredentials = AWS.util.inherit(
  AWS.Credentials,
  {
    /**
     * Creates a new SingleSignOnCredentials object.
     *
     * @param options [map] a set of options
     * @option options profile [String] (AWS_PROFILE env var or 'default')
     *   the name of the profile to load.
     * @option options filename [String] ('~/.aws/credentials' or defined by
     *   AWS_SHARED_CREDENTIALS_FILE process env var)
     *   the filename to use when loading credentials.
     * @option options callback [Function] (err) Credentials are eagerly loaded
     *   by the constructor. When the callback is called with no error, the
     *   credentials have been loaded successfully.
     */
    constructor: function SingleSignOnCredentials(options) {
      AWS.Credentials.call(this);

      options = options || {};
      this.errorCode = "SingleSignOnCredentialsProviderFailure";
      this.expired = true;

      this.filename = options.filename;
      this.profile =
        options.profile || process.env.AWS_PROFILE || AWS.util.defaultProfile;
      this.service = new AWS.SSO();
      this.get(options.callback || AWS.util.fn.noop);
    },

    /**
     * @api private
     */
    load: function load(callback) {
      var self = this;
      try {
        var profiles = AWS.util.getProfilesFromSharedConfig(
          iniLoader,
          this.filename
        );
        var profile = profiles[this.profile] || {};

        if (Object.keys(profile).length === 0) {
          callback(
            AWS.util.error(Error(`Profile ${this.profile} not found`), {
              code: self.errorCode,
            }),
            null
          );
          throw Error(`Profile ${this.profile} not found`);
        }
        if (!profile.sso_start_url) {
          callback(
            AWS.util.error(
              new Error(`No sso_start_url set for profile ${this.profile}`),
              { code: "SingleSignOnCredentialsProviderFailure" }
            ),
            null
          );
          return;
        }

        const fileName = `${sha1(profile.sso_start_url)}.json`;

        const cachePath = path.join(
          os.homedir(),
          ".aws",
          "sso",
          "cache",
          fileName
        );
        let cacheObj = null;
        if (fs.existsSync(cachePath)) {
          const cachedFile = fs.readFileSync(cachePath);
          cacheObj = JSON.parse(cachedFile.toString());
        }

        if (!cacheObj) {
          callback(
            AWS.util.error(
              new Error(`Cached credentials not found under ${cachePath}. Please make sure you log in with 'aws sso login' first`),
              { code: "SingleSignOnCredentialsProviderFailure" }
            ),
            null
          );
          return;
        }

        const region = profile.sso_region;
        const endpoint = `portal.sso.${region}.amazonaws.com`;
        // The endpoint configuration is not automatically updated as per issue:
        // https://github.com/aws/aws-sdk-js/issues/3558
        self.service.config.update({ region, endpoint });
        self.service.endpoint = new AWS.Endpoint(endpoint, self.service.config);

        const request = {
          accessToken: cacheObj.accessToken,
          accountId: profile.sso_account_id,
          roleName: profile.sso_role_name,
        };
        self.service.getRoleCredentials(request, (err, c) => {
          if (err || !c) {
            console.log(err, {
              accountId: request.accountId,
              roleName: request.roleName,
            });
            callback(
              AWS.util.error(
                Error(
                  err ? err.message : 'Please log in using "aws sso login"'
                ),
                { code: self.errorCode }
              ),
              null
            );
            return;
          }
          self.expired = false;
          AWS.util.update(self, {
            accessKeyId: c.roleCredentials.accessKeyId,
            secretAccessKey: c.roleCredentials.secretAccessKey,
            sessionToken: c.roleCredentials.sessionToken,
            expireTime: new Date(c.roleCredentials.expiration),
          });
          callback(null);
        });
      } catch (err) {
        console.log(err);
        callback(AWS.util.error(err, { code: self.errorCode }), null);
      }
    },

    /**
     * Loads the credentials from the AWS SSO process
     *
     * @callback callback function(err)
     *   Called after the AWS SSO process has been executed. When this
     *   callback is called with no error, it means that the credentials
     *   information has been loaded into the object (as the `accessKeyId`,
     *   `secretAccessKey`, and `sessionToken` properties).
     *   @param err [Error] if an error occurred, this value will be filled
     * @see get
     */
    refresh: function refresh(callback) {
      iniLoader.clearCachedFiles();
      this.coalesceRefresh(callback || AWS.util.fn.callback);
    },
  }
);