Retrieve a list of roomlists from Exchange 2010 via SOAP.

retrieve_exchange_room_lists.mm

// Retrieve a list of roomlists from Exchange 2010 via SOAP.
// This method then uses SMXMLDocument to retrieve the e-mail addresses for those roomlists, 
// which can be used to query the individual rooms
// DEPENDENCIES: AFNetworking v1 (https://github.com/AFNetworking/AFNetworking)
//               SMXMLDocument (https://github.com/nfarina/xmldocument)
//
// NOTE: I used AFHTTPRequestOperation instead of AFXMLRequestOperation because I wanted the XML, not an XML parser
//       (which is what AFXMLRequestOperation returns)

- (void) readRoomLists {
    NSString *soapMessage = [NSString stringWithFormat:@""
                               @"<?xml version=\"1.0\" encoding=\"utf-8\"?>"
                               @"<soap:Envelope xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\" xmlns:t=\"http://schemas.microsoft.com/exchange/services/2006/types\" xmlns:m=\"http://schemas.microsoft.com/exchange/services/2006/messages\">"
                               @"<soap:Header>"
                               @"<t:RequestServerVersion Version =\"Exchange2010_SP2\"/>"
                               @"</soap:Header>"
                               @"<soap:Body>"
                               @"<m:GetRoomLists />"
                               @"</soap:Body>"
                               @"</soap:Envelope>"
                               @""];

    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:[self makeExchangeRequestWithMessage:soapMessage]];
    
    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
        NSError *error_ = nil;
        
        SMXMLDocument *xml = [SMXMLDocument documentWithData:responseObject error:&error_];
        
        if (!error_) {
            SMXMLElement *Body                 = [xml.root childNamed:@"Body"];
            SMXMLElement *GetRoomListsResponse = [Body childNamed:@"GetRoomListsResponse"];
            SMXMLElement *RoomLists            = [GetRoomListsResponse childNamed:@"RoomLists"];
            for (SMXMLElement *room in [RoomLists childrenNamed:@"Address"]) {
                SMXMLElement *element = [room childNamed:@"EmailAddress"];
                NSString *email = [element value];
                // do something with the roomlist e-mail address here
            }
            NSLog(@"finished reading roomLists");
        }
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"error: %@", operation.responseString);
    }];
    
    [operation setAuthenticationChallengeBlock:^(NSURLConnection *connection, NSURLAuthenticationChallenge *challenge) {
        [self handleAuthChallenge:connection :challenge];
    }];
    
    [operation start];
}

- (NSMutableURLRequest *)makeExchangeRequestWithMessage:(NSString *)soapMessage {
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"https://OutlookWebAccessServer.domain.tld/ews/exchange.asmx"]];
    [request setValue:@"text/xml" forHTTPHeaderField:@"Content-type"];
    [request setValue:@"" forHTTPHeaderField:@"SOAPAction"];
    [request setHTTPMethod:@"POST"];
    [request setHTTPBody:[soapMessage dataUsingEncoding:NSUTF8StringEncoding]];
    return request;
}

-(void) handleAuthChallenge:(NSURLConnection *) connection :(NSURLAuthenticationChallenge *) challenge {
    if( [[challenge protectionSpace] authenticationMethod] == NSURLAuthenticationMethodNTLM ) {
        NSLog(@"trying NTLM...");
        if( [challenge previousFailureCount] > 0 ) {
            // Avoid too many failed authentication attempts which could lock out the user
            NSLog(@"NTLM backing out, too many failures");
            [[challenge sender] cancelAuthenticationChallenge:challenge];
        } else {
            NSLog(@"NTLM success!");
            [[challenge sender] useCredential:[NSURLCredential credentialWithUser:self.soapUsername password:self.soapPassword persistence:NSURLCredentialPersistenceForSession] forAuthenticationChallenge:challenge];
        }
    } else {
        // Authenticate in other ways than NTLM if desired or cancel the auth like this:
        [[challenge sender] cancelAuthenticationChallenge:challenge];
    }
}