ApiClient.js

/**
 * DocuSign REST API
 * The DocuSign REST API provides you with a powerful, convenient, and simple Web services API for interacting with DocuSign.
 *
 * OpenAPI spec version: v2.1
 * Contact: devcenter@docusign.com
 *
 * NOTE: This class is auto generated. Do not edit the class manually and submit a new issue instead.
 *
 */
(function(root, factory) {
  if (typeof define === 'function' && define.amd) {
    // AMD. Register as an anonymous module.
    define(['superagent'], factory);
  } else if (typeof module === 'object' && module.exports) {
    // CommonJS-like environments that support module.exports, like Node.
    module.exports = factory(require('superagent'));
  } else {
    // Browser globals (root is window)
    if (!root.Docusign) {
      root.Docusign = {};
    }
    root.Docusign.ApiClient = factory(root.superagent, opts);
  }
}(this, function(superagent, opts) {
  'use strict';

  var SCOPE_SIGNATURE = "signature";
  var SCOPE_EXTENDED = "extended";
  var SCOPE_IMPERSONATION = "impersonation";

  var removeNulls = function(obj) {
    var isArray = obj instanceof Array;
    for (var k in obj) {
      if (typeof obj[k] === "object") removeNulls(obj[k]);
      if (isArray && obj.length === k) removeNulls(obj);
      if (obj[k] instanceof Array && obj[k].length === 0) delete obj[k];
    }
    return obj;
  };

  var generateAndSignJWTAssertion = function(clientId, scopes, privateKey, oAuthBasePath, expiresIn, userId) {
    if(typeof expiresIn !== 'number' || expiresIn < 0)
      throw new Error("Invalid expires in param detected");

    var MILLESECONDS_PER_SECOND = 1000,
      JWT_SIGNING_ALGO = "RS256",
      now = Math.floor(Date.now() / MILLESECONDS_PER_SECOND),
      later = now + expiresIn,
      jwt = require('jsonwebtoken'),
      parsedScopes = Array.isArray(scopes) ? scopes.join(' ') : scopes;

    var jwtPayload = {
      iss: clientId,
      aud: oAuthBasePath,
      iat: now,
      exp: later,
      scope: parsedScopes,
    };

    /** optional parameters  **/
    if(userId) {
      jwtPayload.sub = userId;
    }
    return jwt.sign(jwtPayload, privateKey, { algorithm: JWT_SIGNING_ALGO });
  };

  var sendJWTTokenRequest = function (assertion, oAuthBasePath, callback) {
    var request = superagent.post("https://" + oAuthBasePath + "/oauth/token")
      .timeout(exports.prototype.timeout)
      .set('Content-Type', 'application/x-www-form-urlencoded')
      .set('Cache-Control', 'no-store')
      .set('Pragma', 'no-cache')
      .send({
        'assertion': assertion,
        'grant_type': 'urn:ietf:params:oauth:grant-type:jwt-bearer'
      });


    if (!callback){
      return new Promise(function(resolve, reject){
        request.end(function(err, data){
          if (err){
            reject(err);
          } else {
            resolve(data);
          }
        })
      });
    } else {
      request.end(callback);
    }
  };

  var deriveOAuthBasePathFromRestBasePath = function(basePath) {
    if (basePath == null) {
      return exports.prototype.OAuth.BasePath.PRODUCTION;
    }
    if (basePath.includes('https://stage')) {
      return exports.prototype.OAuth.BasePath.STAGE;
    }
    if (basePath.includes('https://demo')) {
      return exports.prototype.OAuth.BasePath.DEMO;
    }
    if (basePath.includes('https://www.docusign')) {
      return exports.prototype.OAuth.BasePath.PRODUCTION;
    }
    return exports.prototype.OAuth.BasePath.PRODUCTION;
  };

  /**
   * @module ApiClient
   */

  /**
   * Manages low level client-server communications, parameter marshalling, etc. There should not be any need for an
   * application to use this class directly - the *Api and model classes provide the public API for the service. The
   * contents of this file should be regarded as internal but are documented for completeness.
   * @alias module:ApiClient
   * @class
   */
  var exports = function(opts) {
    var defaults = {
      basePath: 'https://www.docusign.net/restapi'.replace(/\/+$/, ''),
      oAuthBasePath: require('./OAuth').BasePath.PRODUCTION,
    };

    opts = Object.assign({},defaults, opts);
    opts.oAuthBasePath = deriveOAuthBasePathFromRestBasePath(opts.basePath);

    /**
     * The base URL against which to resolve every API call's (relative) path.
     * @type {String}
     * @default https://www.docusign.net/restapi
     */
    this.basePath = opts.basePath;

    /**
     * The base URL against which to resolve every authentication API call's (relative) path.
     * @type {String}
     * @default https://www.docusign.net/restapi
     */
    this.oAuthBasePath = opts.oAuthBasePath;

    /**
     * The authentication methods to be included for all API calls.
     * @type {Array.<String>}
     */
    this.authentications = {
      'docusignAccessCode': {type: 'oauth2'}
    };
    /**
     * The default HTTP headers to be included for all API calls.
     * @type {Array.<String>}
     * @default {}
     */
    this.defaultHeaders = { "X-DocuSign-SDK": "Node", "Node-Ver": process.version };

    /**
     * The default HTTP timeout for all API calls.
     * @type {Number}
     * @default 60000
     */
    this.timeout = 60000;

    /**
     * If set to false an additional timestamp parameter is added to all API GET calls to
     * prevent browser caching
     * @type {Boolean}
     * @default true
     */
    this.cache = true;
  };

    /**
   * Gets the API endpoint base URL.
   */
    exports.prototype.getBasePath = function getBasePath() {
    return this.basePath;
  };

  /**
   * Sets the API endpoint base URL.
   */
  exports.prototype.setBasePath = function setBasePath(basePath) {
    this.basePath = basePath;
    this.oAuthBasePath = deriveOAuthBasePathFromRestBasePath(basePath);
  };

    /**
   * Gets the authentication server endpoint base URL.
   */
    exports.prototype.getOAuthBasePath = function getOAuthBasePath() {
    return this.oAuthBasePath;
  };

  /**
   * Sets the authentication server endpoint base URL.
   */
  exports.prototype.setOAuthBasePath = function setOAuthBasePath(oAuthBasePath) {
    this.oAuthBasePath = oAuthBasePath;
  };

  /**
   * Adds request headers to the API client. Useful for Authentication.
   */
  exports.prototype.addDefaultHeader = function addDefaultHeader(header, value) {
    this.defaultHeaders[header] = value;
  };

  /**
   * Returns a string representation for an actual parameter.
   * @param param The actual parameter.
   * @returns {String} The string representation of <code>param</code>.
   */
  exports.prototype.paramToString = function(param) {
    if (param == undefined || param == null) {
      return '';
    }
    if (param instanceof Date) {
      return param.toJSON();
    }
    return param.toString();
  };

  /**
   * Builds full URL by appending the given path to the base URL and replacing path parameter place-holders with parameter values.
   * NOTE: query parameters are not handled here.
   * @param {String} path The path to append to the base URL.
   * @param {Object} pathParams The parameter values to append.
   * @returns {String} The encoded path with parameter values substituted.
   */
  exports.prototype.buildUrl = function(path, pathParams) {
    if (!path.match(/^\//)) {
      path = '/' + path;
    }
    var url = this.basePath + path;
    var _this = this;
    url = url.replace(/\{([\w-]+)\}/g, function(fullMatch, key) {
      var value;
      if (pathParams.hasOwnProperty(key)) {
        value = _this.paramToString(pathParams[key]);
      } else {
        value = fullMatch;
      }
      return encodeURIComponent(value);
    });
    return url;
  };

  /**
   * Checks whether the given content type represents JSON.<br>
   * JSON content type examples:<br>
   * <ul>
   * <li>application/json</li>
   * <li>application/json; charset=UTF8</li>
   * <li>APPLICATION/JSON</li>
   * </ul>
   * @param {String} contentType The MIME content type to check.
   * @returns {Boolean} <code>true</code> if <code>contentType</code> represents JSON, otherwise <code>false</code>.
   */
  exports.prototype.isJsonMime = function(contentType) {
    return Boolean(contentType != null && contentType.match(/^application\/json(;.*)?$/i));
  };

  /**
   * Chooses a content type from the given array, with JSON preferred; i.e. return JSON if included, otherwise return the first.
   * @param {Array.<String>} contentTypes
   * @returns {String} The chosen content type, preferring JSON.
   */
  exports.prototype.jsonPreferredMime = function(contentTypes) {
    for (var i = 0; i < contentTypes.length; i++) {
      if (this.isJsonMime(contentTypes[i])) {
        return contentTypes[i];
      }
    }
    return contentTypes[0];
  };

  /**
   * Checks whether the given parameter value represents file-like content.
   * @param param The parameter to check.
   * @returns {Boolean} <code>true</code> if <code>param</code> represents a file.
   */
  exports.prototype.isFileParam = function(param) {
    // fs.ReadStream in Node.js (but not in runtime like browserify)
    if (typeof window === 'undefined' &&
        typeof require === 'function' &&
        require('fs') &&
        param instanceof require('fs').ReadStream) {
      return true;
    }
    // Buffer in Node.js
    if (typeof Buffer === 'function' && param instanceof Buffer) {
      return true;
    }
    // Blob in browser
    if (typeof Blob === 'function' && param instanceof Blob) {
      return true;
    }
    // File in browser (it seems File object is also instance of Blob, but keep this for safe)
    if (typeof File === 'function' && param instanceof File) {
      return true;
    }
    return false;
  };

  /**
   * Normalizes parameter values:
   * <ul>
   * <li>remove nils</li>
   * <li>keep files and arrays</li>
   * <li>format to string with `paramToString` for other cases</li>
   * </ul>
   * @param {Object.<String, Object>} params The parameters as object properties.
   * @returns {Object.<String, Object>} normalized parameters.
   */
  exports.prototype.normalizeParams = function(params) {
    var newParams = {};
    for (var key in params) {
      if (params.hasOwnProperty(key) && params[key] != undefined && params[key] != null) {
        var value = params[key];
        if (this.isFileParam(value) || Array.isArray(value)) {
          newParams[key] = value;
        } else {
          newParams[key] = this.paramToString(value);
        }
      }
    }
    return newParams;
  };

  /**
   * Enumeration of collection format separator strategies.
   * @enum {String}
   * @readonly
   */
  exports.CollectionFormatEnum = {
    /**
     * Comma-separated values. Value: <code>csv</code>
     * @const
     */
    CSV: ',',
    /**
     * Space-separated values. Value: <code>ssv</code>
     * @const
     */
    SSV: ' ',
    /**
     * Tab-separated values. Value: <code>tsv</code>
     * @const
     */
    TSV: '\t',
    /**
     * Pipe(|)-separated values. Value: <code>pipes</code>
     * @const
     */
    PIPES: '|',
    /**
     * Native array. Value: <code>multi</code>
     * @const
     */
    MULTI: 'multi'
  };

  /**
   * Builds a string representation of an array-type actual parameter, according to the given collection format.
   * @param {Array} param An array parameter.
   * @param {module:ApiClient.CollectionFormatEnum} collectionFormat The array element separator strategy.
   * @returns {String|Array} A string representation of the supplied collection, using the specified delimiter. Returns
   * <code>param</code> as is if <code>collectionFormat</code> is <code>multi</code>.
   */
  exports.prototype.buildCollectionParam = function buildCollectionParam(param, collectionFormat) {
    if (param == null) {
      return null;
    }
    switch (collectionFormat) {
      case 'csv':
        return param.map(this.paramToString).join(',');
      case 'ssv':
        return param.map(this.paramToString).join(' ');
      case 'tsv':
        return param.map(this.paramToString).join('\t');
      case 'pipes':
        return param.map(this.paramToString).join('|');
      case 'multi':
        // return the array directly as SuperAgent will handle it as expected
        return param.map(this.paramToString);
      default:
        throw new Error('Unknown collection format: ' + collectionFormat);
    }
  };

  /**
   * Applies authentication headers to the request.
   * @param {Object} request The request object created by a <code>superagent()</code> call.
   * @param {Array.<String>} authNames An array of authentication method names.
   */
  exports.prototype.applyAuthToRequest = function(request, authNames) {
    var _this = this;
    authNames.forEach(function(authName) {
      var auth = _this.authentications[authName];
      switch (auth.type) {
        case 'basic':
          if (auth.username || auth.password) {
            request.auth(auth.username || '', auth.password || '');
          }
          break;
        case 'apiKey':
          if (auth.apiKey) {
            var data = {};
            if (auth.apiKeyPrefix) {
              data[auth.name] = auth.apiKeyPrefix + ' ' + auth.apiKey;
            } else {
              data[auth.name] = auth.apiKey;
            }
            if (auth['in'] === 'header') {
              request.set(data);
            } else {
              request.query(data);
            }
          }
          break;
        case 'oauth2':
          if (auth.accessToken) {
            request.set({'Authorization': 'Bearer ' + auth.accessToken});
          }
          break;
        default:
          throw new Error('Unknown authentication type: ' + auth.type);
      }
    });
  };

  /**
   * Deserializes an HTTP response body into a value of the specified type.
   * @param {Object} response A SuperAgent response object.
   * @param {(String|Array.<String>|Object.<String, Object>|Function)} returnType The type to return. Pass a string for simple types
   * or the constructor function for a complex type. Pass an array containing the type name to return an array of that type. To
   * return an object, pass an object with one property whose name is the key type and whose value is the corresponding value type:
   * all properties on <code>data<code> will be converted to this type.
   * @returns A value of the specified type.
   */
  exports.prototype.deserialize = function deserialize(response, returnType) {
    if (response == null || returnType == null || response.status == 204) {
      return null;
    }
    // Rely on SuperAgent for parsing response body.
    // See http://visionmedia.github.io/superagent/#parsing-response-bodies
    var data = response.body || (response.res && response.res.data);
    if (data == null || (typeof data === 'object' && typeof data.length === 'undefined' && !Object.keys(data).length)) {
      // SuperAgent does not always produce a body; use the unparsed response as a fallback
      data = response.text;
    }
    return exports.convertToType(data, returnType);
  };

  exports.prototype.hasBufferFormParam = function(formParams) {
    if (!formParams) {
      return false;
    }
    return Object.keys(formParams).some(function(key) {
      return formParams[key] instanceof Buffer;
    });
  };

  /**
   * (Optional)Callback function to receive the result of the <operationId> operation. If none specified a Promise will be returned.
   * @callback module:ApiClient~callApiCallback
   * @param {String} error Error message, if any.
   * @param data The data returned by the service call.
   * @param {String} response The complete HTTP response.
   */

  /**
   * Invokes the REST service using the supplied settings and parameters.
   * @param {String} path The base URL to invoke.
   * @param {String} httpMethod The HTTP method to use.
   * @param {Object.<String, String>} pathParams A map of path parameters and their values.
   * @param {Object.<String, Object>} queryParams A map of query parameters and their values.
   * @param {Object.<String, Object>} headerParams A map of header parameters and their values.
   * @param {Object.<String, Object>} formParams A map of form parameters and their values.
   * @param {Object} bodyParam The value to pass as the request body.
   * @param {Array.<String>} authNames An array of authentication type names.
   * @param {Array.<String>} contentTypes An array of request MIME types.
   * @param {Array.<String>} accepts An array of acceptable response MIME types.
   * @param {(String|Array|ObjectFunction)} returnType The required type to return; can be a string for simple types or the
   * constructor for a complex type.
   * @param {module:ApiClient~callApiCallback} callback The callback function. If this is left undefined, this method will return a promise instead.
   * @returns {Object} The SuperAgent request object if a callback is specified, else {Promise} A {@link https://www.promisejs.org/|Promise} object.
   */
  exports.prototype.callApi = function callApi(path, httpMethod, pathParams,
      queryParams, headerParams, formParams, bodyParam, authNames, contentTypes, accepts,
      returnType, callback) {

    var _this = this;
    var url = this.buildUrl(path, pathParams);
    var request = superagent(httpMethod, url);
    var _formParams = this.normalizeParams(formParams);
    var body = httpMethod.toUpperCase() === 'GET' && !bodyParam ? undefined : bodyParam || {};

    // apply authentications
    this.applyAuthToRequest(request, authNames);

    // set query parameters
    if (httpMethod.toUpperCase() === 'GET' && this.cache === false) {
      queryParams['_'] = new Date().getTime();
    }
    request.query(this.normalizeParams(queryParams));

    // set header parameters
    request.set(this.defaultHeaders).set(this.normalizeParams(headerParams));

    // set request timeout
    request.timeout(this.timeout);

    var contentType = this.jsonPreferredMime(contentTypes);
    if (contentType) {
      // Issue with superagent and multipart/form-data (https://github.com/visionmedia/superagent/issues/746)
      if(contentType != 'multipart/form-data') {
        request.type(contentType);
      }
    } else if (!request.header['Content-Type']) {
      request.type('application/json');
    }

    if (contentType === 'application/x-www-form-urlencoded') {
      request.send(this.normalizeParams(formParams));
    } else if (contentType == 'multipart/form-data') {
      if (this.hasBufferFormParam(_formParams)) {
        request.set({
          'Content-Disposition': 'form-data; name="file"; filename="file.xml"'
        });
        request.set({
          'Content-Type': 'application/octet-stream'
        });
        var formAttachmentKey = Object.keys(formParams).find(function(key) {
          return _this.isFileParam(_formParams[key]);
        });
        request.send(removeNulls(formParams[formAttachmentKey]));
      } else {
        var _formParams = this.normalizeParams(formParams);
        for (var key in _formParams) {
          if (_formParams.hasOwnProperty(key)) {
            if (this.isFileParam(_formParams[key])) {
              // file field
              request.attach(key, _formParams[key]);
            } else {
              request.field(key, _formParams[key]);
            }
          }
        }
      }
    } else if (body) {
      request.send(removeNulls(body));
    }

    var accept = this.jsonPreferredMime(accepts);
    if (accept) {
      request.accept(accept);
    }

    var data;
    if (request.header['Accept'] === 'application/pdf') {
      request.buffer();
      data = '';
    } else {
      data = '';
    }

    if (request.header['Accept'] === 'application/pdf') {
      request.parse( function (res, fn) {
        res.data = '';
        res.setEncoding('binary');
        res.on( 'data', function (chunk) { res.data += chunk; } );
        res.on( 'end', function () {
          try {
            fn( null, res.data );
          } catch ( err ) {
            fn( err );
          }
        });
      })
    }


      var data = null;
      if (!callback) {
        return new Promise(function(resolve, reject){
          request.end(function(error, data) {
            if (error) {
              reject(error);
            } else {
              try {
                data = _this.deserialize(data, returnType);
                resolve(data);
              } catch(error){
                reject(error);
              }
            }
          })
        });
      } else {
        request.end(function(error, response) {
          if (!error) {
            try {
              data = _this.deserialize(response, returnType);
            } catch (err) {
              error = err;
            }
          }
          callback(error, data, response);
        });
        return request;
      }
  };

  /**
   * Parses an ISO-8601 string representation of a date value.
   * @param {String} str The date value as a string.
   * @returns {Date} The parsed date object.
   */
  exports.parseDate = function(str) {
    return new Date(str.replace(/T/i, ' '));
  };

  /**
   * Converts a value to the specified type.
   * @param {(String|Object)} data The data to convert, as a string or object.
   * @param {(String|Array.<String>|Object.<String, Object>|Function)} type The type to return. Pass a string for simple types
   * or the constructor function for a complex type. Pass an array containing the type name to return an array of that type. To
   * return an object, pass an object with one property whose name is the key type and whose value is the corresponding value type:
   * all properties on <code>data<code> will be converted to this type.
   * @returns An instance of the specified type.
   */
  exports.convertToType = function(data, type) {
    switch (type) {
      case 'Boolean':
        return Boolean(data);
      case 'Integer':
        return parseInt(data, 10);
      case 'Number':
        return parseFloat(data);
      case 'String':
        return String(data);
      case 'Date':
        return this.parseDate(String(data));
      default:
        if (type === Object) {
          // generic object, return directly
          return data;
        } else if (typeof type === 'function') {
          // for model type like: User
          return type.constructFromObject(data);
        } else if (Array.isArray(type)) {
          // for array type like: ['String']
          var itemType = type[0];
          return data.map(function(item) {
            return exports.convertToType(item, itemType);
          });
        } else if (typeof type === 'object') {
          // for plain object type like: {'String': 'Integer'}
          var keyType, valueType;
          for (var k in type) {
            if (type.hasOwnProperty(k)) {
              keyType = k;
              valueType = type[k];
              break;
            }
          }
          var result = {};
          for (var k in data) {
            if (data.hasOwnProperty(k)) {
              var key = exports.convertToType(k, keyType);
              var value = exports.convertToType(data[k], valueType);
              result[key] = value;
            }
          }
          return result;
        } else {
          // for unknown type, return the data directly
          return data;
        }
    }
  };

  /**
   * Constructs a new map or array model from REST data.
   * @param data {Object|Array} The REST data.
   * @param obj {Object|Array} The target object or array.
   */
  exports.constructFromObject = function(data, obj, itemType) {
    if (Array.isArray(data)) {
      for (var i = 0; i < data.length; i++) {
        if (data.hasOwnProperty(i))
          obj[i] = exports.convertToType(data[i], itemType);
      }
    } else {
      for (var k in data) {
        if (data.hasOwnProperty(k))
          obj[k] = exports.convertToType(data[k], itemType);
      }
    }
  };

  /**
   * Helper method to configure the OAuth accessCode/implicit flow parameters
   * @param clientId OAuth2 client ID: Identifies the client making the request.
   * Client applications may be scoped to a limited set of system access.
   * @param scopes the list of requested scopes.
   * @param redirectUri this determines where to deliver the response containing the authorization code or access token.
   * @param responseType determines the response type of the authorization request.
   * <br><i>Note</i>: these response types are mutually exclusive for a client application.
   * A public/native client application may only request a response type of "token";
   * a private/trusted client application may only request a response type of "code".
   * @param state Allows for arbitrary state that may be useful to your application.
   * The value in this parameter will be round-tripped along with the response so you can make sure it didn't change.
   */
  exports.prototype.getAuthorizationUri = function(clientId, scopes, redirectUri, responseType, state) {
    if (!clientId) throw new Error('Error clientId is required');
    if (!scopes) throw new Error('Error scopes is required');
    if (!scopes) throw new Error('Error scopes is required');
    if (!this.hasNoInvalidScopes(scopes)) throw new Error('Error invalid scope detected');
    if (!redirectUri) throw new Error('Error redirectUri is required');
    if (!responseType) throw new Error('Error responseType is required');

    var formattedScopes = scopes.join(encodeURI(' '));
    return "https://" +
      this.getOAuthBasePath() +
      "/oauth/auth"+
      "?response_type=" + responseType +
      "&scope=" + formattedScopes +
      "&client_id="+ clientId +
      "&redirect_uri=" + encodeURIComponent(redirectUri) +
      (state ? "&state=" + encodeURIComponent(state) : '');
  };

  /**
   * @param clientId OAuth2 client ID: Identifies the client making the request.
   * Client applications may be scoped to a limited set of system access.
   * @param clientSecret the secret key you generated when you set up the integration in DocuSign Admin console.
   * @param code The authorization code that you received from the <i>getAuthorizationUri</i> callback.
   * @return OAuthToken object.xx
   */
  exports.prototype.generateAccessToken = function(clientId, clientSecret, code, callback) {
    if (!clientId) throw new Error('Error clientId is required', null);
    if (!clientSecret) throw new Error('Error clientSecret is required', null);
    if (!code) throw new Error('Error code is required', null);

    var clientString = clientId + ":" + clientSecret,
      postData = {
        "grant_type": "authorization_code",
        code: code,
      },
      headers = {
        "Authorization": "Basic " + (new Buffer(clientString).toString('base64')),
        "Cache-Control": "no-store",
        "Pragma": "no-cache"
      },
      OAuthToken = require('./OAuth').OAuthToken,
      request = superagent.post("https://" + this.getOAuthBasePath() + "/oauth/token")
        .send(postData)
        .set(headers)
        .type("application/x-www-form-urlencoded");

    if (!callback) {
      return new Promise(function (resolve, reject) {
        request.end(function (err, res) {
          if (err) {
            reject(err);
          } else {
            resolve(OAuthToken.constructFromObject(res.body))
          }
        });
      });
    } else {
      request.end(function (err, res) {
        var OAuthToken;
        if (err) {
          return callback(err, res);
        } else {
          OAuthToken = require('./OAuth').OAuthToken;
          return callback(err, OAuthToken.constructFromObject(res.body))
        }
      });
    }
  };

  /**
   * @param accessToken the bearer token to use to authenticate for this call.
   * @return OAuth UserInfo model
   */
  exports.prototype.getUserInfo = function(accessToken, callback) {
    if(!accessToken) throw new Error('Error accessToken is required',null);

    var headers = {
      "Authorization": "Bearer " + accessToken,
      "Cache-Control": "no-store",
      "Pragma": "no-cache"
    }

    var request = superagent.get("https://" + this.getOAuthBasePath() + "/oauth/userinfo").set(headers);
    var UserInfo = require('./OAuth').UserInfo;


    if(!callback) {
      try {
        return new Promise(function (resolve, reject) {
          request.end(function (err, res) {
            if (err) {
              reject(err);
            } else {
              try {
                return resolve(UserInfo.constructFromObject(res.body));
              } catch (error) {
                reject(error);
              }
            }
          });
        });
      } catch (err) {
        throw(err);
      }
    } else {
      request.end(function (err, res) {
        if (err) {
          return callback(err, res);
        } else {
          return callback(err, UserInfo.constructFromObject(res.body));
        }
      });
    }
  };

  /**
   * Helper method to build the OAuth JWT grant uri (used once to get a user consent for impersonation)
   * @param clientId OAuth2 client ID
   * @param redirectURI OAuth2 redirect uri
   * @param oAuthBasePath DocuSign OAuth base path (account-d.docusign.com for the developer sandbox
   * 			  and account.docusign.com for the production platform)
   * @returns {string} the OAuth JWT grant uri as a String
   */
  exports.prototype.getJWTUri = function(clientId, redirectURI, oAuthBasePath) {
    return "https://" + oAuthBasePath + "/oauth/auth" + "?" +
      "response_type=code&" +
      "client_id=" + encodeURIComponent(clientId) + "&" +
      "scope=" + encodeURIComponent(`${SCOPE_SIGNATURE} ${SCOPE_IMPERSONATION}`) + "&" +
      "redirect_uri=" + encodeURIComponent(redirectURI);
  };

  /**
   * @deprecated since version 4.1.0
   * Configures the current instance of ApiClient with a fresh OAuth JWT access token from DocuSign
   * @param privateKeyFilename the filename of the RSA private key
   * @param oAuthBasePath DocuSign OAuth base path (account-d.docusign.com for the developer sandbox
   *   			and account.docusign.com for the production platform)
   * @param clientId DocuSign OAuth Client Id (AKA Integrator Key)
   * @param userId DocuSign user Id to be impersonated (This is a UUID)
   * @param expiresIn in seconds for the token time-to-live
   * @param callback the callback function.
   */
  exports.prototype.configureJWTAuthorizationFlow = function(privateKeyFilename, oAuthBasePath, clientId, userId, expiresIn, callback) {
    console.warn('configureJWTAuthorizationFlow is a deprecated function! Please use requestJWTUserToken()')
    var _this = this;
    var jwt = require('jsonwebtoken')
      , fs  = require('fs')
      , private_key = fs.readFileSync(privateKeyFilename)
      , now         = Math.floor(Date.now() / 1000)
      , later       = now + expiresIn;

    var jwt_payload = {
      iss: clientId,
      sub: userId,
      aud: oAuthBasePath,
      iat: now,
      exp: later,
      scope: SCOPE_SIGNATURE
    };

    var assertion = jwt.sign(jwt_payload, private_key, {algorithm: 'RS256'});

    superagent('post', 'https://' + this.getOAuthBasePath() + '/oauth/token')
      .timeout(this.timeout)
      .set('Content-Type', 'application/x-www-form-urlencoded')
      .set('Cache-Control', 'no-store')
      .set('Pragma', 'no-cache')
      .send({
        'assertion': assertion,
        'grant_type': 'urn:ietf:params:oauth:grant-type:jwt-bearer'
      })
      .end(function(err, res) {
        if (callback) {
          if (!err && res.body && res.body.access_token) {
            _this.addDefaultHeader('Authorization', 'Bearer ' + res.body.access_token);
          }
          callback(err, res);
        }
      });
  };

  exports.prototype.hasNoInvalidScopes = function(scopes) {
    var validScopes = require('./oauth/Scope');

    return (
      Array.isArray(scopes)
      && scopes.length > 0
      && scopes.every(function(scope) {
        return Object.keys(validScopes).some(function(key) {
          return validScopes[key] === scope;
        })
      })
    );
  };

  exports.prototype.requestJWTUserToken = function(clientId, userId, scopes, rsaPrivateKey, expiresIn, callback) {
    var privateKey = rsaPrivateKey,
      assertion = generateAndSignJWTAssertion(clientId, scopes, privateKey, this.getOAuthBasePath(), expiresIn, userId);

    return sendJWTTokenRequest(assertion, this.oAuthBasePath, callback);
  };

  exports.prototype.requestJWTApplicationToken = function(clientId, scopes, rsaPrivateKey, expiresIn, callback) {
    var privateKey = rsaPrivateKey,
      assertion = generateAndSignJWTAssertion(clientId, scopes, privateKey, this.getOAuthBasePath(), expiresIn);

    return sendJWTTokenRequest(assertion, this.oAuthBasePath, callback);
  };

  exports.prototype.OAuth = require('./OAuth');
  exports.prototype.RestApi = require('./RestApi');
  /**
   * The default API client implementation.
   * @type {module:ApiClient}
   */
  exports.instance = new exports(opts);

  return exports;
}));

module.exports.OAuth = require('./OAuth');
module.exports.RestApi = require('./RestApi');