Login

Authentication with the PIXO Platform is as simple as calling the Login function. If you read the Apex API documentation you can get a better understanding of what is happening under the hood, but the SDK automates nearly everything and makes authentication a breeze.

 

To authenticate, you must pass a username and password to UApexAPI::Login(). You can also bundle an Assisted Login code, generated on the PIXO Platform, as the username and any length string into the password into a FApexLoginInfo object and pass it to UApexAPI::Login().

 

Features of this function are that it:

• Sends the user's information to the Apex Server to login. Return TRUE.
• Returns FALSE if the password or login are of zero length.

Authenticated Launches

More and more users are adopting the PiXO Hub App. Alongside the many features of the Hub App, one feature, Authenticated Launches, are something you'll want to integrate with your application. Authenticated Launch takes a user who is already logged and passes their user token into another application.

 

1. You can check if your application has been passed a user token by calling UApexAPI::HasLaunchAuthToken(), which will return true if there is a token waiting for you to use.
2. Now that you know there is a token, you'll want to call UApexAPI::LoginWithAuthToken(). This function takes the token and calls a login flow.
3. After this function is called, you can follow the login event flow to know when the users token has been verified and the users information is available to your application.

Return to Hub

When your application exits, it's important to return the user to the Hub App. You can do this with a call to UPixoLauncherSubsystem::LaunchApplication, which takes in 3 parameters:

• ApplicationName:FString — com.PixoVR.PixoHub
• ExtraKey:FString — This value should always be pixotoken
• ExtraValue:FString — This should be the currently logged in user's token

Handling Authentication API Responses

The Apex SDK provides a way to receive the data from the API calls. The approach in the Unreal Apex SDK is done through both a generalized Success and Fail Delegate.

 

In Blueprint:

Bind a function or event to the following Delegates:

UApexAPI::OnRequestComplete(EApexRequestType, RequestType, const class UVaRestRequestJSON*, Request)

Called when the users information is valid and has access to the module.

• RequestType for Authentication will be EApexRequestType::Login
• Request will contain the Json values for the successful response, but all of the information that will be needed is also apart of UApexAPI::CurrentActiveLogin

UApexAPI::OnRequestFail(EApexRequestType, RequestType, const class UVaRestRequestJSON*, Request, FAPEXRequestFailed, FailedRequestResponse)

Called when the users information is invalid, does not have access to the module or the server is not able to be reached.

• RequestType for Authentication will be EApexRequestType::Login
• Request will contain the Json values for the failed response
• FailedRequestResponse will contain the error message and HTTP response code

In C++:

UApexAPI::OnStaticRequestComplete(EApexRequestType, RequestType, const class UVaRestRequestJSON*, Request)

Called when the users information is valid and has access to the module.

UApexAPI::OnRequestFail(EApexRequestType, RequestType, const class UVaRestRequestJSON*, Request, FAPEXRequestFailed, FailedRequestResponse)

Called when the users information is invalid, does not have access to the module or the server is not able to be reached.

 

In the Example Code section, you'll see both Blueprint and C++ examples on how to bind to the event delegates.

 

Accessing the Apex API in Unreal

To authenticate, you need to reach the UApexAPI Game Instance Subsystem. We've provided examples of how to reach it below.

Using Blueprint:

Using C++:

UApexAPI* ApexAPI = GetGameInstance()->GetSubsystem<UApexAPI>();

You will also need to add the ApexSDK as a dependency module name in the project's Build.cs file in order to make this call in C++.

PublicDependencyModuleNames.AddRange(new string[] { "ApexSDK" });

If you're handling a response in C++, you will also want to add "VaRest" to the project's dependency module list.

PublicDependencyModuleNames.AddRange(new string[] { "VaRest" });

 

Calling Login

Below is an example of how to call the authentication function UApexAPI::Login().

Using C++:

UApexAPI* ApexAPI = GetGameInstance()->GetSubsystem<UApexAPI>();
ApexAPI->Login("[email protected]", "123abc");

Using Blueprint:

 

Example Code

Binding to API Response Delegates

Using C++:

void SetupApexResponse()
{
    UApexAPI* ApexAPI = GetGameInstance()->GetSubsystem<UApexAPI>();
    ApexAPI->OnStaticRequestComplete.AddLambda([&](EApexRequestType RequestType, const UVaRestRequestJSON* Request) -> void { OnRequestComplete(RequestType, Request); });
    ApexAPI->OnStaticRequestFail.AddLambda([&](EApexRequestType RequestType, const UVaRestRequestJSON* Request, FAPEXRequestFailed FailedRequestResponse) -> void { OnRequestFail(RequestType, Request, FailedRequestResponse); });
}
 
void OnRequestComplete(EApexRequestType RequestType, const UVaRestRequestJSON* Request)
{
    if(RequestType == EApexRequestType::Login)
    {
        // Handle Successful Login here!
    }
}
 
void OnRequestFail(EApexRequestType RequestType, const UVaRestRequestJSON* Request, FAPEXRequestFailed FailedRequestResponse)
{
    if(RequestType == EApexRequestType::Login)
    {
        // Handle Failed Login here!
    }
}

Using Blueprint:

Successful Request Response

Failed Request Response

 

Q&A On Authentication

We've decided to provide some notes on questions we've been asked about authentication.

Q: Is the user's information encrypted?
A: Yes, but not by anything internal to the Apex SDK or API calls. Instead, we use TLS over HTTPS.

 

Q: Does the Login call do anything besides log-in the user?
A. Yes, Login goes beyond and checks the user against the module to see if they have access to module. During this, we also pass back some module and user specific information which will be seen a successful login response.

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