text: // Copyright (c) Microsoft Corporation.
  // All rights reserved.
  //
  // This code is licensed under the MIT License.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files(the "Software"), to deal
  // in the Software without restriction, including without limitation the rights
  // to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
  // copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions :
  //
  // The above copyright notice and this permission notice shall be included in
  // all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  // THE SOFTWARE.
  
  
  #import <Foundation/Foundation.h>
  #import "OIDCRequestContext.h"
  #import "OIDCAuthenticationError.h"
  /*!
   For OAUTH authority, type can be specified to be on-prems, or cloud.
    */
  typedef enum
  {
      /*! The SDK will try DRS discovery service for on-prems. */
      OIDC_OAUTH_ON_PREMS,
      
      /*! The SDK will try DRS discovery service for cloud. */
      OIDC_OAUTH_CLOUD
      
  } AdfsType;
  
  @interface OIDCDrsDiscoveryRequest : NSObject
  
  /*!
   This handles DRS discovery request to be used for OAUTH authority validation/
   
   @param domain          The domain to be used. Usually this is from the UPN suffix.
   @param type            Indicates whether the DRS is on prems or on cloud.
   @param context         Context to be used for the internal web request
   @param completionBlock Completion block for this asynchronous request.
   
   */
  + (void)requestDrsDiscoveryForDomain:(NSString *)domain
                              adfsType:(AdfsType)type
                               context:(id<OIDCRequestContext>)context
                       completionBlock:(void (^)(id result, OIDCAuthenticationError *error))completionBlock;
  
  // Fetches the corresponding URL for the request
  + (NSURL *)urlForDrsDiscoveryForDomain:(NSString *)domain adfsType:(AdfsType)type;
  
  @end
  