Configure the Function

Now, we will begin coding the authorization portal application by configuring the function component.

The function’s directory, (functions/authorization_portal_function), contains:

• The CustomUserValidationFunc.java main function file
• The catalyst-config.json configuration file
• Java library files in the lib directory
• .classpath and .project dependency files

You will be adding code in the CustomUserValidationFunc.java file.

The Basic I/O function contains the following functionalities:

• The end-user’s details will provided as a JSON input to the Custom User Validation function.
• The function is coded to implement a custom logic based upon which the end-user will either be authenticated or denied.

Now, let’s begin coding the Basic I/O function.

Copy the code given below and paste it in the CustomUserValidationFunc.java file in the functions/authorization_portal_function directory of your project, and save the file. You can use any IDE of your choice to work with the application’s files.

    

        
CustomUserValidationFunc.java
        

            
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import com.catalyst.Context;
import com.catalyst.basic.BasicIO;
import com.catalyst.basic.ZCFunction;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.util.logging.Logger;
import java.util.logging.Level;
import com.zc.api.APIConstants.ZCSignupValidationStatus;
import com.zc.common.ZCProject;
import com.zc.component.auth.ZCSignupResponseUserDetails;
import com.zc.component.auth.ZCSignupUserValidationRequest;
import com.zc.component.auth.ZCSignupUserValidationResponse;
import com.zc.component.users.ZCSignupUserService;
 
public class Custom_User_Validation_Java implements ZCFunction {
private static final Logger LOGGER = Logger.getLogger(Custom_User_Validation_Java.class.getName());
 
@Override
public void runner(Context context, BasicIO basicIO) throws Exception {
try {
ZCProject.initProject();
ZCSignupUserValidationRequest requestDetails = ZCSignupUserService.getSignupValidationRequest(basicIO);
if(requestDetails != null) {
ZCSignupUserValidationResponse validationResponse = ZCSignupUserValidationResponse.getInstance();
if(requestDetails.getUserDetails().getEmailId().contains("@zylker.com")) {
validationResponse.setStatus(ZCSignupValidationStatus.FAILURE); // The user has failed authentication
}
else { 
// The actions that occur in the event of a successful authentication can be customized
validationResponse.setStatus(ZCSignupValidationStatus.SUCCESS); 
ZCSignupResponseUserDetails respUserDetails = ZCSignupResponseUserDetails.getInstance();
respUserDetails.setRoleIdentifier("App User"); // If you want to override the default role, you can specify the role id/name here.
validationResponse.setUserDetails(respUserDetails);
}
basicIO.setStatus(200);
basicIO.write(new ObjectMapper().writeValueAsString(validationResponse));
}
}
catch(Exception e) {
LOGGER.log(Level.SEVERE,"Exception in Custom_User_Validation_Java",e);
basicIO.setStatus(500);
basicIO.write("An error has occured. Please try again after sometime.");
}   
}
}
         
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The function directory is now configured. We can now proceed to configuring the client directory.