FaceLiveness

FaceLiveness for iOS brings cutting-edge live facial verification and fingerprint authentication technology into your iOS applications. By leveraging the iProov Biometrics iOS SDK and FingerprintPro S

Current Version

Name	Version
FaceLiveness	7.0.0

Requirements

Deployment Info	Version
iOS Target	13.0+
Xcode	15.4+
Swift	5.5+

• A valid Caf mobileToken.

• Cocoapods installed

SDK Dependencies

FaceLiveness utilizes two key external SDKs, managed through CocoaPods for straightforward integration:

SDK	Version
iProov	12.2.2
FingerprintPro	2.6.0

• iProov Biometrics iOS: Facilitates the integration of live facial verification technology.

• FingerprintPro iOS: Adds fingerprint authentication capabilities, enhancing your app's security features.

Runtime permissions

In the info.plist file, add the permissions below:

Permission	Reason	Required
Privacy - Camera Usage Description	Capturing the selfie in live facial verification policies	Yes

Installation

CocoaPods

In your Podfile, specify the reference to our framework. Replacing <version> with the current version:

target 'your-project' do
  use_frameworks!

  pod 'FaceLiveness', '<version>'

For versions prior to FaceLiveness 4.0.0, you must also include these additional sources in the Podfile:

source 'https://github.com/combateafraude/iOS.git'
source 'https://cdn.cocoapods.org/'

SPM

1. Open your Xcode project.

2. Navigate to File > Add Packages.

3. In the search bar, paste the URL of this repository:

https://github.com/combateafraude/FaceLiveness.git

Instantiating the SDK

First, instantiate an object of type FaceLivenessSDK. This object is for you to configure all your business rules:

class FaceLivenessViewController: UIViewController {
    var faceLiveness: FaceLivenessSDK?

    func setupFaceLiveness() {
        faceLiveness = FaceLivenessSDK.Build()
        // the table below shows all the SDK configuration options
        .build()
        faceLiveness?.delegate = self
    }

    func startFaceLiveness() {
        faceLiveness?.startSDK(viewController: self, mobileToken:"yourMobileToken", personId: "personId")
    }
}

FaceLiveness Options

Parameter	Required	Default Value
.startSDK(viewController: UIViewController, mobileToken: String, personId: String) token: Usage token associated with your CAF account personId: Identifier of the user who will perform the face liveness verification. It's recommended to use the user's identification document in this field, such as their CPF (Brazilian document ID), but it could be any other value.
.setStage(stage: CAFStage) Used to redirect the SDK to the desired environment in caf api. It has the following options: .beta or .prod.	No	.prod
.setFilter(filter: Filter) Set the camera filter applied to the camera preview. It has the following options: .natural or .lineDrawing	No	.lineDrawing
.setLoadingScreen(withLoading: Bool) This boolean parameter determines whether the loading screen will be implemented via a delegate or if you will use the default screen. If set to 'true,' the loading screen will be a standard SDK screen. In the case of 'false,' you should use the 'LoadingScreen' session and implement the delegates.	No	false
.setImageUrlExpirationTime(time: Time) Use to change the default image URL expiration time to retrieve the scan capture. It has the following options: .threeHours, .thirtyDays or .thirtyMin.	No	30 min
.setAuthenticationBaseUrl(authBaseUrl: String) Enables the use of a reverse proxy to execute SDK's authentications. Sets the base URL for authentication; protocol must be HTTPS. Adds a trailing slash if missing.	No	Default Caf URL
.setFaceLivenessBaseUrl(livenessBaseUrl: String) Enables the use of a reverse proxy to execute face liveness checks. Sets the base URL; protocol must be WSS. Adds a trailing slash if missing. Requires certificates set via .setCertificates for security.	No	Default IProov URL
.setCertificates(certificates: [String]) Sets the SHA256 Base64-encoded protocols for secure communication in reverse proxy implementations. Required when using custom URLs for authentication or face liveness checks.	No	Empty list

Reverse Proxy

To configure reverse proxy settings, please follow these instructions:

FaceLiveness Reverse Proxy

• Set your proxy to communicate with the URL that corresponds to the CAFStage you are using:

  • CAFStage.PROD -> https://api.public.caf.io/v1/sdks/faces/

  • CAFStage.BETA -> https://api.public.beta.caf.io/v1/sdks/faces/

  • CAFStage.DEV -> https://api.public.dev.caf.io/v1/sdks/faces/

• Use the method .setFaceLivenessBaseUrl to set the URL on which FaceLiveness should run.

  • The URL's protocol must be WSS.

• Use the .setCertificates method to set the certificates, which should be the base64-encoded SHA-256 hash of the certificate's Subject Public Key Info.

  • Certificates are required for the FaceLiveness reverse proxy to work properly.

    faceLiveness = FaceLivenessSDK.Build()
    .setFaceLivenessBaseUrl("wss://my.proxy.io/ws/")
    .setCertificates(certificates: [
        "4d69f16113bed7d62ca56feb68d32a0fcb7293d3960=",
        "50f71c5dda30741ee4be1ac378e12539b0d1d511f99=",
        "9f85e26c1ae41f7ac97adc4099be7f2a40759510ab9="
    ])
    .build()

Authentication reverse proxy

• Set your proxy to communicate with `wss://us.rp.secure.iproov.me/ws´.

• Use the method .setAuthenticationBaseUrl to set the URL on which the authorization requests must run.

  • The URL's protocol must be HTTPS.

    faceLiveness = FaceLivenessSDK.Build()
        .setAuthenticationBaseUrl("https://my.proxy.io/v1/faces/")
        .build();

Getting the Results

You must implement the FaceLivenessDelegate class to get the SDK results. To do that, you should provide a UIViewController to your SDK instance:

faceLiveness?.delegate = self

Delegate Implementation

The delegate below must be implemented to handle the SDK results. When implementing the delegate extension, you will have access to an object depending on the return type. In each case, the object carries different information.

extension FaceLivenessViewController: FaceLivenessDelegate {
    func didFinishLiveness(with livenessResult: FaceLiveness.LivenessResult) {
        //handle success result
    }
    
    func didFinishWithError(with sdkError: FaceLiveness.SDKError) {
        //handle error result
    }

    func didFinishWithFailure(with sdkFailure: FaceLiveness.SDKFailure) {
        //handle failure result
    }
    
    func didFinishWithCancelled() {
        //handle when user closes the SDK
    }
    
    func onConnectionChanged(_ state: FaceLiveness.LivenessState) {
        //handle loading screen display
    }
}

Loading Screen

To create a loading screen during the SDK validation processes, you need to implement a view with the loading screen and display this screen in the onConnectionChanged(_ state: FaceLiveness.LivenessState) delegate function.

state	description	loading screen
closed	SDK has been closed	dismiss
connecting	SDK is connecting to liveness server	display
connected	SDK has been connected with the liveness server	dismiss

In the SDK implementation, it is necessary to add the view to the view stack using the following code. This makes the view visible.

  view.addSubview(loadingHUD)

This view should be added before the Builder of each SDK.

SDK Results

Success cases

At the end of a successful execution, you will receive an object of type LivenessResult. This object carries a signedResponse property containing a JWT token with the execution result. This token should be decrypted to obtain the execution results details.

  livenessResult.signedResponse

LivenessResult (Struct)

Property	Description
signedResponse: String?	Signed response from the CAF server confirming that the captured selfie has a real face. This parameter is used to get an extra layer of security, checking that the signature of the response is not broken, or caused by request interception. If it is broken, there is a strong indication of request interception.

SignedResponse params

Within the signedResponse, the parameter isAlive defines the execution of liveness, where true is approved and false is rejected (Failure case will be returned).

Event	Description
requestId	Request identifier.
isAlive	Validation of a living person, identifies whether the user passed successfully or not.
token	Request token.
userId	User identifier provided for the request.
imageUrl	Temporary link to the image, generated by our API.
personId	User identifier provided for the SDK.
sdkVersion	Sdk version in use.
iat	Token expiration.

The isAlive parameter is VERY IMPORTANT, as it dictates whether the validation process proceeds or halts. When isAlive: true, the user gains passage to continue their journey; conversely, if isAlive: false, the user is deemed invalid and access to further stages of the journey should be denied. This parameter plays a pivotal role in guiding the flow of operations.

Error cases

In the event of execution errors, you will receive an object of type SDKError. This object encompasses an enum containing the errorType, and a description.

SDKError (Struct)

Property	Description
errorType ErrorType?	Return the type of the error.
description String?	Error description.

ErrorType (Enum)

ErrorType	Description
unsupportedDevice	Indicates that the device hardware or software does not meet the minimum requirements for facial recognition.
cameraPermission	Indicates that the device does not have permission to access the camera, either due to user denial or missing app permissions.
networkException	Indicates a network-related error, such as no internet connection, server timeouts, or network congestion.
tokenException	Indicates an issue with the provided authentication token, such as being invalid, expired, or lacking necessary permissions.
serverException	Indicates a server-side error, which may include server misconfigurations, processing failures, or service interruptions.
certificateException	Indicates that there are no valid certificates for the proxy URL, preventing secure communication.
captureAlreadyActiveException	Indicates that a facial recognition capture is already in progress. A new capture cannot start until the current one completes.
unexpectedErrorException	Indicates an unrecoverable error occurred during the facial recognition transaction.
userTimeoutException	Indicates a server-side error, which may include server misconfigurations, processing failures, or service interruptions.
imageNotFoundException	Indicates a user has taken too long to complete the claim.
tooManyRequestsException	Indicates that the server has received more requests than it’s prepared to handle.

Failure cases

In the event of execution failures, you will receive an object of type SDKFailure. This object encompasses an enum containing the failureType, description and a signedResponse.

SDKFailure (Class)

Property	Description
signedResponse String?	Signed response from the CAF server confirming that the captured selfie has a real face. This parameter is used to get an extra layer of security, checking that the signature of the response is not broken, or caused by request interception. If it is broken, there is a strong indication of request interception.
failureType String?	In case of a specific failure, return the error type.
failureMessage String?	In case of a specific failure, return the instructions to avoid the error.

Failure Types

All failure reasons are exclusively returned in GPA liveness validation flows. In LA (Liveness Assurance) flows, any failure will consistently return the generic UNKNOWN error, regardless of the specific issue encountered.

FailureType	Description	LA	GPA
unknown	Try again.	✅	✅
tooMuchMovement	Keep still.	❌	✅
tooBright	Move somewhere darker.	❌	✅
tooDark	Move somewhere brighter.	❌	✅
misalignedFace	Keep your face in the oval.	❌	✅
eyesClosed	Keep your eyes open.	❌	✅
faceTooFar	Move your face closer to the screen.	❌	✅
faceTooClose	Move your face farther from the screen.	❌	✅
sunglasses	Remove sunglasses.	❌	✅
obscuredFace	Remove any face coverings.	❌	✅
multipleFaces	Ensure only one person is visible.	❌	✅

⚠️ Sandbox Configuration for iOS

If you encounter the error related to Sandbox: rsync.samba deny file-write-create when using this SDK in an iOS project, follow the steps below:

1. In Xcode, go to your project under the Build Settings tab.

2. In the search field, look for sandbox.

3. Locate the User Script Sandboxing option.

4. Change the value to No.