GSON Object (RESTful api)

Question

I have a client (java) that send some json data to my server (c++). After this my server respond with some informations depending the operation made my java client. For now its works.

Example body request:
{
   "userEmail": "email@email.com",
   "userPassword": "12345678"
}

And the server, receive the email and password and do the operations and send back a response.

But now i need to change my java client to send the request like this:

{
  "userInformation":{
        "userEmail": "email@email.com",
        "userPassword": "12345678"
  }

}

This request can be use to do the login. This is a very complex architecture so i cannot copy all code, but in login class i used the gson (Note i only work in c++ server, i dont work in client and its impossible to contact the guy that made the java client to ask him about this doubts)

Java client - login class

public final String userEmail;
public final String userPassword;


public LoginRequestArgs( String userEmail, String userPassword)
{
    this.userEmail = userEmail;
    this.userPassword = userPassword;       
}

public static LoginRequestArgs fromStringJson(String data)
{
    try
    {
        Gson gson = new Gson();
        return gson.fromJson(data, LoginRequestArgs.class);
    }
    catch(Exception e)
    {
        return null;
    }
}

public static LoginRequestArgs fromBytesJson(byte[] data)
{
    if (data == null) return null;
    try 
    {
        String str = new String(data, "utf-8");
        return fromStringJson(str); 
    }
    catch (Exception e) 
    {
        return null;
    }
}


@Override
public String toJsonString()
{
    try
    {
        Gson gson = new Gson();
        return gson.toJson(this);
    }
    catch(Exception e)
    {
        return null;
    }
}

@Override
public byte[] toJsonBytes()
{
    try 
    {
        return this.toJsonString().getBytes("utf-8");
    }
    catch (Exception e)
    {
        return null;
    }
}

I have other class that connect to my server and send the request. This class call the login function (the request is a SerializableJSON variable) and place this request to my server request = LoginRequestArgs.fromStringJson(args.httpEntity);

(for tests i use one rest client chrome extension)

I know that can be some hard to understand but its not easy to explain all things. I try to explain the essencial.

real problem: i cannot adapt the java client to send the email and password that are inside "userInformation". Someone can help me please? Thanks

EDIT (OTHER BODY REQUEST EXAMPLE):

{
    "userInformation": {
        "otherSection": {
            "key1": "value1",
            "key2": "value2"
        }
    }
}

EDIT 2 (authentication method):

{
    "authenticationMethod": {
        "sessionId": {
            "email": "email@email.com",
            "password": "pass123"
        }
    },
    "userInformation": {
        "userId": "user",
        "userPassword": "user123"
    }
}

EDIT 3 (TOKEN):

{
    "authenticationMethod": {
        "token": {
            "token": "HDI393UDDNDMAY4758SAD"
        }
    },
    "userInformation": {
        "userId": "user",
        "userPassword": "user123"
    }
}

EDIT 4:

{
  "sessionId":{
    "email":"email@email.com",
    "password":"dasdas"

  },
  "userInformation":{
        "userId": "userId1",
        "userPassword": "12345678"
  }

}

I already send this json to my c++ server and its work and my decode session id working too, its not problem for me work on c++. But i need to send sessionId (or token) but inside "AuthenticationMethod", its only the thing i need to implement now. Note the "userInformation" its like and example it can be for example "bookInformation", "carInformation" , depending the request type, i send different data with different keys/values inside.. but the authentication method (session id or token) it is always mandatory to use in all request.

To work like i show to you i implement this:

public class SessionId {

    public String email;
    public String password;

    public SessionId(String email, String password)
    {
        this.email = email;
        this.password = password;
    }

}

And inside the construct of my class (can be for example one class like LoginRequestArgs, the login cass) i call the super:

public UserInfo userInformation;
public SessionId sessionId;

public LoginRequestArgs(String email, String password,String userEmail, String userPassword)
    {   
        super(email,password);
        userInformation = new UserInfo(userEmail, userPassword);
    }


static class UserInfo {
        public String userId;
        public String userPassword;

        public UserInfo(String userEmail, String userPassword) {
            this.userId = userEmail;
            this.userPassword = userPassword;
        }
    }

So for now, i only need to add "authenticationMethod" before session id or token (i believe the way to do this its the same for both)

**** EDIT 5 ********

login.java

public class LoginRequestArgs implements SerializableJSON  {

    public UserInfo userInformation;
    public AuthenticationMethod authenticationMethod;

    public LoginRequestArgs(String email, String password,String userId, String userPassword)
    {   
        AuthenticationMethod auth = new SessionId(email, password);
        setAuth(auth);
        userInformation = new UserInfo(userId, userPassword);
    }

    public void setAuth(AuthenticationMethod authenticationMethod){
            this.authenticationMethod = authenticationMethod;
    }

    static class UserInfo {
        public String userId;
        public String userPassword;

        public UserInfo(String userEmail, String userPassword) {
            this.userId = userEmail;
            this.userPassword = userPassword;
        }
    }

SessionId.java

public class SessionId extends AuthenticationMethod {

    Session sessionId;

     public SessionId(String email, String password)
     {
         this.sessionId = new Session(email,password);

     }

     static class Session{
         String email;
         String password;

         public Session(String email, String password)
         {
             this.email = email;
             this.password = password;
         }

     }
}

AuthenticationMethod.java

public class AuthenticationMethod {


}

Answer 1

You'll need to change the LoginRequestArgs class to look something like this:

public class LoginRequestArgs {

    public UserInfo userInformation;

    public LoginRequestArgs(String userEmail, String userPassword) {
        userInformation = new UserInfo(userEmail, userPassword);
    }

    static class UserInfo {
        public String userEmail;
        public String userPassword;

        public UserInfo(String userEmail, String userPassword) {
            this.userEmail = userEmail;
            this.userPassword = userPassword;
        }
    }

    public static LoginRequestArgs fromStringJson(String data) {
        try {
            Gson gson = new Gson();
            return gson.fromJson(data, LoginRequestArgs.class);
        } catch (Exception e) {
            return null;
        }
    }

    public static LoginRequestArgs fromBytesJson(byte[] data) {
        if (data == null)
            return null;
        try {
            String str = new String(data, "utf-8");
            return fromStringJson(str);
        } catch (Exception e) {
            return null;
        }
    }

}

and here is how you can access the email and password:

loginRequestArgsInstance.userInformation.userEmail;
loginRequestArgsInstance.userInformation.userPassword;

You should probably add some getters and setters to this class or at least make sure that userInformation is not null.

There are multiple ways of including the session details into the JSON. One way will be to modify your java classes. Something like this:

Req.java

public class Req{
    String data1;
    String data2;
    Auth authenticationMethod;
    ....
    public void setAuth(Auth authenticationMethod){
        this.authenticationMethod = authenticationMethod;
    }
}

Auth.java

public class Auth{
   ....
}

AuthToken.java

public class AuthToken extends Auth {

    Token token;

    public AuthToken(String token) {
        this.token = new Token(token);
    }

    static class Token {
        String token;

        public Token(String token) {
            this.token = token;
        }

    }
}

AuthUserInfo.java

public class AuthUserInfo extends Auth {

    UserInfo sessionId;

    public AuthUserInfo(String email, String password) {
        this.sessionId = new UserInfo(email, password);
    }

    static class UserInfo {
        String email;
        String password;

        public UserInfo(String email, String password) {
            this.email = email;
            this.password = password;
        }
    }
}

And here is how you can use these class':

Req req = new Req(...);
Auth auth = new AuthToken(...);// OR: new AuthUserInfo(...);
req.setAuth(auth);
String json = new Gson().toJson(req);

Another way will be to add new properties to the JSON after you create it. You can see an example of how you could do that here