How to Integrate Server-Based Liveness into Your Mobile Application

This guide outlines the steps for integrating the Oz Liveness Mobile SDK into a customer mobile application for capturing facial videos and subsequently analyzing them on the server.

The SDK implements a ready-to-use face capture user interface that is essential for seamless customer experience and accurate liveness results. The SDK methods for liveness analysis communicate with Oz API under the hood.

Before you begin, make sure you have Oz API credentials. When using SaaS API, you get them from us:

Login: [e-mail] Password: … API: https://sandbox.ohio.ozforensics.com Web Console: https://sandbox.ohio.ozforensics.com

For the on-premise Oz API, you need to create a user yourself or ask your team that manages the API. See the guide on user creation via Web Console. Consider the proper user role (CLIENT in most cases or CLIENT ADMIN, if you are going to make SDK work with the pre-created folders from other API users). In the end, you need to obtain a similar set of credentials as you would get for the SaaS scenario.

Oz Liveness Mobile SDK requires a license. License is bound to the bundle_id of your application, e.g., com.yourcompany.yourapp. Issue the 1-month trial license on our website or email us for a long-term license.

Android

1. Add SDK to your project

In the build.gradle of your project, add:

allprojects {
    repositories {
        maven { url "https://ozforensics.jfrog.io/artifactory/main" }
    }
}

In the build.gradle of the module, add:

dependencies {
    implementation 'com.ozforensics.liveness:full:<version>'
    // You can find the version needed in the Android changelog
}

2. Initialize SDK

Rename the license file to forensics.license and place it into the project's res/raw folder.

Kotlin

OzLivenessSDK.init(
    context,
    listOf(LicenseSource.LicenseAssetId(R.raw.forensics))
)

Java

OzLivenessSDK.INSTANCE.init(
        context,
        Collections.singletonList(new LicenseSource.LicenseAssetId(R.raw.forensics)),
        null
);

3. Connect SDK to Oz API

Use API credentials (login, password, and API URL) that you’ve got from us.

Kotlin

OzLivenessSDK.setApiConnection(
    OzConnection.fromCredentials(host, username, password),
    statusListener(
        { token -> /* token */ },
        { ex -> /* error */ }
    )
)

Java

OzLivenessSDK.INSTANCE.setApiConnection(
        OzConnection.Companion.fromCredentials(host, username, password),
        new StatusListener<String>() {
            @Override
            public void onStatusChanged(@Nullable String s) {}
            @Override
            public void onSuccess(String token) { /* token */ }
            @Override
            public void onError(@NonNull OzException e) { /* error */ }
        }
);

In production, instead of hard-coding login and password in the application, it is recommended to get access token on your backend with API auth method then pass it to your application:

Kotlin

OzLivenessSDK.setApiConnection(OzConnection.fromServiceToken(host, token))

Java

OzLivenessSDK.INSTANCE.setApiConnection(
        OzConnection.Companion.fromServiceToken(host, token), 
        null
);

4. Add face recording

To start recording, use startActivityForResult:

Kotlin

val OZ_LIVENESS_REQUEST_CODE = 1
val intent = OzLivenessSDK.createStartIntent(listOf( OzAction.Blank)) startActivityForResult(intent, OZ_LIVENESS_REQUEST_CODE)

Java

int OZ_LIVENESS_REQUEST_CODE = 1;
Intent intent = OzLivenessSDK.INSTANCE.createStartIntent(Collections.singletonList(OzAction.Blank));
startActivityForResult(intent, OZ_LIVENESS_REQUEST_CODE);

To obtain the captured video, use onActivityResult:

Kotlin

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    super.onActivityResult(requestCode, resultCode, data)
        if (requestCode == OZ_LIVENESS_REQUEST_CODE) {
            val sdkMediaResult = OzLivenessSDK.getResultFromIntent(data)
            val sdkErrorString = OzLivenessSDK.getErrorFromIntent(data)
            if (!sdkMediaResult.isNullOrEmpty()) {
                analyzeMedia(sdkMediaResult)
            } else println(sdkErrorString)
        }
    }

Java

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == OZ_LIVENESS_REQUEST_CODE) {
        List<OzAbstractMedia> sdkMediaResult = OzLivenessSDK.INSTANCE.getResultFromIntent(data);
        String sdkErrorString = OzLivenessSDK.INSTANCE.getErrorFromIntent(data);
        if (sdkMediaResult != null && !sdkMediaResult.isEmpty()) {
            analyzeMedia(sdkMediaResult);
        } else System.out.println(sdkErrorString);
    }
}

The sdkMediaResult object contains the captured videos.

5. Run analyses

To run the analyses, execute the code below. Mind that mediaList is an array of objects that were captured (sdkMediaResult) or otherwise created (media you captured on your own).

Kotlin

private fun analyzeMedia(mediaList: List<OzAbstractMedia>) {
    AnalysisRequest.Builder()
        .addAnalysis(Analysis(Analysis.Type.QUALITY, Analysis.Mode.SERVER_BASED, mediaList))
        .build()
        .run(object : AnalysisRequest.AnalysisListener {
            override fun onSuccess(result: List<OzAnalysisResult>) {
                result.forEach { 
                    println(it.resolution.name)
                    println(it.folderId)
                }
            }
            override fun onError(error: OzException) {
                error.printStackTrace()
            }
        })
} 

Java

private void analyzeMedia(List<OzAbstractMedia> mediaList) {
    new AnalysisRequest.Builder()
            .addAnalysis(new Analysis(Analysis.Type.QUALITY, Analysis.Mode.SERVER_BASED, mediaList, Collections.emptyMap()))
            .build()
            .run(new AnalysisRequest.AnalysisListener() {
                @Override public void onStatusChange(@NonNull AnalysisRequest.AnalysisStatus analysisStatus) {}
                @Override
                public void onSuccess(@NonNull List<OzAnalysisResult> list) {
                    for (OzAnalysisResult result: list) {
                        System.out.println(result.getResolution().name());
                        System.out.println(result.getFolderId());
                    }
                }
                @Override
                public void onError(@NonNull OzException e) { e.printStackTrace(); }
    });
}

iOS

1. Add our SDK to your project

Install OZLivenessSDK via CocoaPods. To integrate OZLivenessSDK into an Xcode project, add to Podfile:

pod 'OZLivenessSDK', :git => 'https://gitlab.com/oz-forensics/oz-liveness-ios', :tag => '<version>' // You can find the version needed in  iOS changelog

2. Initialize SDK

Rename the license file to forensics.license and put it into the project.

OZSDK(licenseSources: [.licenseFileName("forensics.license")]) { licenseData, error in
    if let error = error {
        print(error.errorDescription)
    }
}

3. Connect SDK to Oz API

Use API credentials (login, password, and API URL) that you’ve got from us.

OZSDK.setApiConnection(Connection.fromCredentials(host: “https://sandbox.ohio.ozforensics.com”, login: login, password: p)) { (token, error) in
    // Your code to handle error or token
}

In production, instead of hard-coding the login and password in the application, it is recommended to get an access token on your back end using the API auth method, then pass it to your application:

OZSDK.setApiConnection(Connection.fromServiceToken(host: "https://sandbox.ohio.ozforensics.com", token: token)) { (token, error) in
}

4. Add face recording

Create a controller that will capture videos as follows:

let actions: [OZVerificationMovement] = [.selfie]
let ozLivenessVC: UIViewController = OZSDK.createVerificationVCWithDelegate(delegate, actions: actions) 
self.present(ozLivenessVC, animated: true)

The delegate object must implement OZLivenessDelegate protocol:

let actions: [OZVerificationMovement] = [.selfie]
let ozLivenessVC: UIViewController = OZSDK.createVerificationVCWithDelegate(delegate, actions: actions) 
self.present(ozLivenessVC, animated: true)

5. Run analyses

Use AnalysisRequestBuilder to initiate the Liveness analysis. The communication with Oz API is under the hood of the run method.

let analysisRequest = AnalysisRequestBuilder()
let analysis = Analysis.init(
media: mediaToAnalyze, 
type: .quality, 
mode: .serverBased)
analysisRequest.uploadMedia(mediaToAnalyze)
analysisRequest.addAnalysis(analysis)
analysisRequest.run(
scenarioStateHandler: { state in }, // scenario steps progress handler
uploadProgressHandler: { (progress) in } // file upload progress handler 
) { (analysisResults : [OzAnalysisResult], error) in 
    // receive and handle analyses results here 
    for result in analysisResults {
        print(result.resolution)
        print(result.folderID)
    }
}

With these steps, you are done with basic integration of Mobile SDKs. You will be able to access recorded media and analysis results in Web Console via browser or programmatically via API.

In developer guides, you can also find instructions for customizing the SDK look-and-feel and access the full list of our Mobile SDK methods. Check out the table below:

Android sample app source codes	iOS sample app source codes
Android OzLiveness SDK Developer Guide	iOS OzLiveness SDK Developer Guide
Demo app in PlayMarket	Demo app in TestFlight