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Installation

Prove provides the iOS SDK in Swift. It has a download size of 2.5 MB and an install size of 1.5 MB for the minimum required components. It relies on iOS native APIs. Prove’s iOS SDK supports the earlier three major versions. Prove has seen successful transactions with iOS v11.

Prove manages a repository with the libraries to enable integration.

Execute the following to import CocoaPod from the Prove pod repository:

shell
# Run this command to install the cocoapods-art plugin (authored by Artifactory)
gem install cocoapods-art

# Run this command to add the Prove pod repository
pod repo-art add prove.jfrog.io https://prove.jfrog.io/artifactory/api/pods/libs-public-cocoapods

# In your Podfile, paste in the Prove pod repository as a source
plugin 'cocoapods-art', :sources => [
    'prove.jfrog.io'
]

# In your Podfile, paste in the SDK pods
pod 'ProveAuth', '6.4.0'

# Run this command to install the SDK pods
pod install

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Send the Type of Flow: Mobile

Unlike the Web SDK, when using the iOS SDK, use the mobile flow. Pass mobile to the Unify() function on the server. In a mobile flow, one-time password (OTP) validation is performed on the mobile phone.

In the mobile flow, once OTP validation is complete, the AuthFinishStep function executes.

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Authenticate()

The SDK requires an authToken as a parameter for the Authenticate() function. This token returns from the Unify() call of the server-side SDK. The token is session specific so it’s used for a single flow. It also expires after 15 minutes.

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Retrieve authToken

To start the flow, you’ll need to send a request to your back end server with the possession type, and an phone number if you are using Prove’s possession check.

Swift
// The below example uses native iOS URLSession, but any other
// alternative networking approaches should also work
func initialize(phoneNumber: String, possessionType: String, completion: @escaping (Result\<String, Error>) -> Void) {
    guard let url = URL(string: "\(backendUrl)/initialize") else {
        completion(.failure(URLError(.badURL)))
        return
    }
    var request = URLRequest(url: url)
    request.httpMethod = "POST"
    request.addValue("application/json", forHTTPHeaderField: "Accept")
    request.addValue("application/json", forHTTPHeaderField: "Content-Type")
    // Set up the request body
    let body: [String: Any] = [
        "phoneNumber": phoneNumber,
        "possessionType": possessionType
    ]
    do {
        request.httpBody = try JSONSerialization.data(withJSONObject: body, options: \[])
    } catch {
        completion(.failure(error))
        return
    }
    // Perform the request
    let task = URLSession.shared.dataTask(with: request) { \_, response, error in
        // Handle network or connection errors
        if let error = error {
            completion(.failure(error))
            return
        }
        do {
            if let json = try JSONSerialization.jsonObject(with: data, options: \[]) as? [String: Any],
               let authToken = json["authToken"] as? String {
                completion(.success(authToken))
            } else {
                let parsingError = NSError(domain: "", code: 0, userInfo: [NSLocalizedDescriptionKey : "Failed to parse JSON or authToken is missing"])
                completion(.failure(parsingError))
            }
        } catch {
            completion(.failure(error))
        }
    }
    // Start the network call
    task.resume()
}

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Setup Authenticator

Once you have the authToken, build the authenticator for the mobile flow.

Swift
// Object implementing ProveAuthFinishStep protocols
let finishStep = FinishAuthStep()

// Objects implementing OtpStartStep/OtpFinishStep protocols
let otpStartStep = MobileOtpStartStep()
let otpFinishStep = MobileOtpFinishStep()

let proveAuthSdk: ProveAuth
proveAuthSdk = ProveAuth.builder(authFinish: finishStep)
    .withOtpFallback(otpStart: otpStartStep, otpFinish: otpFinishStep)
    .build()

In the event a cellular data connection is unavailable during testing, use the Builder class. It permits simulated successful session results while connected to a Wi-Fi network. Testing using a Wi-Fi connection is useful in the Sandbox environment.

Swift
proveAuthSdk = ProveAuth.builder(authFinish: finishStep)
  .withMobileAuthTestMode() // Test mode flag
  .build()

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Performing the Authentication

The Prove Auth object is thread safe and used as a singleton. Most Prove Auth methods are blocking and therefore can’t execute in the main application thread. The application employs an executor service with a minimum of two threads to manage threads due to the SDK’s ability to process concurrent blocking requests.

Swift
// authToken retrieved from your server via StartAuthRequest
proveAuthSdk.authenticate(authToken) { error in
  DispatchQueue.main.async {
    self.messages.finalResultMessage = "ProveAuth.authenticate returned error: \(error.localizedDescription)"
    print(self.messages.finalResultMessage)
  }
}

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Validate the Mobile Phone

In the AuthFinishStep, you’ll specify a function to call once the possession checks complete on the mobile phone. In the following code, you’ll notice an endpoint called /verify. This endpoint on your back end server calls the UnifyStatus() function to validate the phone number.

Swift
// Send a verify request.
// The below example uses native iOS URLSession, but any other
// alternative networking approaches should also work
func verify(String: authId, completion: @escaping (Error?) -> Void) {
    guard let url = URL(string: "\(backendUrl)/verify") else {
        completion(URLError(.badURL))
        return
    }
    // Create the request
    var request = URLRequest(url: url)
    request.httpMethod = "POST"
    request.addValue("application/json", forHTTPHeaderField: "Accept")
    request.addValue("application/json", forHTTPHeaderField: "Content-Type")
    // Set up the request body (empty JSON object) - authId is not needed so you can ignore.
    let body: [String: Any] = ["authId": authId]
    do {
        request.httpBody = try JSONSerialization.data(withJSONObject: body, options: \[])
    } catch {
        completion(error)
        return
    }
    // Perform the request
    let task = URLSession.shared.dataTask(with: request) { \_, response, error in
        if let error = error {
            completion(error)
            return
        } catch {
            completion(error)
        }
    }
    // Start the network call
    task.resume()
}

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OTP Configuration

You can implement two functions for the OTP handling - a start and a finish step.

To set the OTP handlers, implement OtpStartStep and OtpFinishStep interfaces. The Swift snippet has an example.

Retry functionality is unavailable in OTP.

OtpStartStep example:

Swift
import Foundation
import ProveAuth
import SwiftUI

// Implementation of OtpStartStep protocol
class MobileOtpStartStep: OtpStartStep {
    @ObservedObject var sheetObservable: SheetObservable
    var callback: OtpStartStepCallback?

    init(sheetObservable: SheetObservable){
        self.sheetObservable = sheetObservable
    }

    // ProveAuth SDK calls this method when it is time to collect a customer's phone number for SMS OTP and/or obtain
    // the customer's confirmation to initiate the SMS message to the phone number provided
    // 'phoneNumberNeeded' argument indicates whether mobile app needs to collect the phone number
    func execute(phoneNumberNeeded: Bool, phoneValidationError: ProveAuthError?, callback: OtpStartStepCallback) {
        // here - signal to ContentView to display OtpStartView
        DispatchQueue.main.async {
            // SDK returns phoneValidationError if the phone number provided is invalid or blocked
            if case .phoneNumberValidationError = phoneValidationError {
                self.sheetObservable.isPhoneValidationError = true
            } else {
                self.sheetObservable.isPhoneValidationError = false
            }
            self.sheetObservable.isOtpStartActive = true
            self.sheetObservable.isPhoneNumberNeeded = phoneNumberNeeded
            self.callback = callback
        }
    }

    // Here - return collected phone number string to SDK
    func handlePhoneNumber(phoneNumber: String? = nil) {
        guard let callback = self.callback else {
            print("Error: OtpStartStepCallback is not set ")
            return
        }
        if let phoneNumber = phoneNumber {
            let otpStartInput = OtpStartInput(phoneNumber: phoneNumber)
            // This is how you pass collected phone number to SDK
            callback.onSuccess(input: otpStartInput)
            return
        }
        // If phoneNumberNeeded = false (in the OtpStartStep.execute) and phone number was already provided in the initial server-to-server call to /start endpoint
        // Then return nil back to SDK, Prove Auth server already got the phone number
        // calling onSuccess here indicates that the customer's confirmation to send SMS was obtained
        callback.onSuccess(input: nil)
    }

    // Here - communicate to the SDK any issues while trying to obtain the phone number.
    // Error should be reported if the customer explicitly cancels the SMS OTP transaction or presses the back button to exit out the SMS OTP start step screen.
    func handleOtpStartError() {
        guard let callback = self.callback else {
            print("Error: OtpStartStepCallback is not set ")
            return
        }
        callback.onError()
    }
}

OtpFinishStep example:

Swift
import Foundation
import SwiftUI
import ProveAuth

// Implementation of OtpFinishStep protocol
class MobileOtpFinishStep: OtpFinishStep {
    @ObservedObject var sheetObservable: SheetObservable
    var callback: OtpFinishStepCallback?

    init(sheetObservable: SheetObservable){
        self.sheetObservable = sheetObservable
    }
    // SDK calls this method when it is time to collect OTP value delivered in the SMS message
    // otpError will be returned if OTP value was incorrect
    func execute(otpError: ProveAuthError?, callback: OtpFinishStepCallback) {
        self.callback = callback
        // here - signal to ContentView to display OtpFinishView
        DispatchQueue.main.async {
            if case .otpValidationError = otpError {
                print("found otpError: \(String(describing: otpError?.localizedDescription))")
            }
            self.sheetObservable.isOtpFinishActive = true
        }
    }

    // Here - return the OTP value to the SDK
    func handleOtp(_ otp: String) {
        guard let callback = self.callback else {
            print("Error: OtpFinishStepCallback is not set ")
            return
        }
        let otpFinishInput = OtpFinishInput(otp: otp)
        callback.onSuccess(input: otpFinishInput)
    }

    // Here - communicate to the SDK any issues while trying to obtain the OTP value.
    // Error should be reported if the customer explicitly cancels the SMS OTP transaction or presses the back button to exit out the SMS OTP finish step screen.
    func handleOtpFinishError() {
        guard let callback = self.callback else {
            print("Error: OtpFinishStepCallback is not set ")
            return
        }
        callback.onError()
    }
}