Objective-C example

[andreieuganox]

Is there any pure Objective-C example anywhere? We use React Native, so to bridge it we need to be able to init the SDK from Obj-C...

[kasper-lahti]

We don't have any Objective-C example at the moment but we'll take a look at what we can do to support using Tink Link with React Native.

[MartinInAction]

Hi! I made a simple bridge to open the tinkLinkSDK in react-native... Might be helpful!

//  TinkLinkManager.m
#import <Foundation/Foundation.h>
#import <React/RCTBridgeModule.h>

@interface RCT_EXTERN_MODULE(TinkLinkSDK, NSObject)

RCT_EXTERN_METHOD(startSDK: (NSString *)clientID
                  market:(NSString *)market
                  urlScheme:(NSString *)urlScheme
                  resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject
                )


@end

//  TinkLinkManager.swift
import Foundation
import UIKit
import TinkLink
import TinkLinkUI

@objc(TinkLinkSDK)
class TinkLinkSDK: UIViewController {

  override func viewDidLoad() {
      super.viewDidLoad()
  }

  
  @objc
  private func startSDK(_ clientID: String, market: String, urlScheme: String, resolver resolve: @escaping RCTPromiseResolveBlock, rejecter reject: @escaping RCTPromiseRejectBlock) {
    DispatchQueue.main.async {

      let scopes: [Scope] = [
          // .statistics(.read),
          .transactions(.read),
          .categories(.read),
          .accounts(.read)
      ]
      
      let redirectURI = NSURL(string: "\(urlScheme)://tink-redirect")

      let configuration = try! Tink.Configuration(clientID: clientID, redirectURI: redirectURI! as URL)
      Tink.configure(with: configuration)

      let tinkLinkViewController = TinkLinkViewController(market: Market(rawValue: market)!, scopes: scopes, providerPredicate: .kinds(.all)) { (result) in
        // (Result<(code: AuthorizationCode, credentials: Credentials), TinkLinkError>)
        switch (result) {
        case .success(let data):
          return resolve(["code": data.code.rawValue])
        case .failure(let error):
          return reject("tink_failed", error.localizedDescription, nil)
        }

      }
      UIApplication.shared.windows.first?.rootViewController?.present(tinkLinkViewController, animated: true)
      }
    }
  }

then you can open it with NativeModules.TinkLinkSDK.startSDK

[maxencehenneron]

@SuperDuperMartin Thank you for the sample code.

Did you get the following error while installing the tink link sdk on a react native project?

Undefined symbols for architecture x86_64:
  "protocol descriptor for Swift.Identifiable", referenced from:
      protocol conformance descriptor for TinkLink.AddCredentialsTask : Swift.Identifiable in TinkLink in libTinkLink.a(AddCredentialsTask.o)
      protocol conformance descriptor for TinkLink.ProviderTree.FinancialInstitutionGroupNode : Swift.Identifiable in TinkLink in libTinkLink.a(ProviderTree.o)
      protocol conformance descriptor for TinkLink.RefreshCredentialsTask : Swift.Identifiable in TinkLink in libTinkLink.a(RefreshCredentialsTask.o)
      protocol conformance descriptor for TinkLink.SupplementInformationTask : Swift.Identifiable in TinkLink in libTinkLink.a(SupplementInformationTask.o)
      protocol conformance descriptor for TinkLink.ThirdPartyAppAuthenticationTask : Swift.Identifiable in TinkLink in libTinkLink.a(ThirdPartyAppAuthenticationTask.o)
  "associated conformance descriptor for Swift.Identifiable.Swift.Identifiable.ID: Swift.Hashable", referenced from:
      protocol conformance descriptor for TinkLink.AddCredentialsTask : Swift.Identifiable in TinkLink in libTinkLink.a(AddCredentialsTask.o)

If so, were you able to resolve it?

EDIT: Found the issue: I fixed it by removing ""$(TOOLCHAIN_DIR)/usr/lib/swift-5.0/$(PLATFORM_NAME)"", line from LIBRARY_SEARCH_PATHS in project.pbxproj file.

[ZiggerZZ]

@maxencehenneron @MartinInAction would you have a code snippet in Java/Kotlin for tink-link-android by any chance?

[MartinInAction]

Hi @ZiggerZZ, sorry for late replay, but yes i do!
something like this:

class TinkLinkManager(reactContext: ReactApplicationContext) : ReactContextBaseJavaModule(reactContext), ActivityEventListener {
    override fun getName(): String {
        return "TinkLinkSDK"
    }
    init {
        reactApplicationContext.addActivityEventListener(this)
    }
    private var mPromise: Promise? = null

    @ReactMethod
    fun startSDK(clientId: String, authCode: String, market: String, urlScheme: String, redirectURI: String, promise: Promise) {
        this.mPromise = promise
        val linkUser = LinkUser.UnauthenticatedUser(authCode)
        val scopes = listOf(Scope.IdentityRead, Scope.UserRead, Scope.AccountsRead, Scope.TransactionsRead)
        val intent = TinkLinkUiActivity.createIntent(
                context = reactApplicationContext,
                linkUser = linkUser,
                scopes = scopes,
                credentialsOperation = CredentialsOperation.Create()
            )
        reactApplicationContext.startActivityForResult(intent, REQUEST_CODE, Bundle.EMPTY)        
    }

    override fun onActivityResult(activity: Activity?, requestCode: Int, resultCode: Int, data: Intent?) {
        if (requestCode == REQUEST_CODE) {
            when (resultCode) {
            TinkLinkUiActivity.RESULT_SUCCESS -> {
                when (
                    val result = data?.getParcelableExtra<TinkLinkResult>(TinkLinkUiActivity.RESULT_DATA)
                ) {
                    is TinkLinkResult.TemporaryUser -> {
                        mPromise?.reject("wrong type")
                    }

                    is TinkLinkResult.PermanentUser -> {
                        mPromise?.resolve("success")
                    }

                    else -> mPromise?.reject("error")
                }
            }

            TinkLinkUiActivity.RESULT_FAILURE -> {
                when (
                    val result = data?.getParcelableExtra<TinkLinkError>(TinkLinkUiActivity.ERROR_DATA)
                ) {
                    is TinkLinkError.FailedToAddCredentials -> {
                        for ((id, error) in result.errorsByCredentialsId) {
                            mPromise?.reject("error")
                        }
                    }
                }
            }

            TinkLinkUiActivity.RESULT_CANCELLED -> {
                // Toast.makeText(reactApplicationContext, "Cancelled", Toast.LENGTH_SHORT).show()
                mPromise?.resolve("cancelled")
            }
        }

        data?.getBundleExtra(TinkLinkUiActivity.FAILED_CREDENTIALS_DATA)
            ?.takeIf { !it.isEmpty }
            ?.let { bundle ->
                for (credentialsId in bundle.keySet()) {
                    val error = bundle.getParcelable<TinkLinkErrorInfo>(credentialsId)
                    mPromise?.reject("error")
                    // Handling logic such as deleting the credentials matching the credentialsId
                }
            }

        }
    }

    override fun onNewIntent(intent: Intent?) = Unit

    companion object {
        const val REQUEST_CODE = 100

        fun initializeTink(context: Context) {
            val linkConfig = TinkConfiguration(
                environment = Environment.Production,
                oAuthClientId = BuildConfig.TINK_CLIENT_ID,
                redirectUri = Uri.Builder()
                    .scheme(BuildConfig.URL_SCHEME)
                    .encodedAuthority(BuildConfig.TINK_URL_HOST)
                    .build()
            )
            Tink.init(linkConfig, context)
        }
    }
}

[ZiggerZZ]

@MartinInAction thanks! Does it work for you? I tried the official tutorial from Tink recently and the app kept loading infinitely.

[MartinInAction]

@ZiggerZZ its working yes! hmm, i think i had a similar issue, and i forgot to install AndroidThreeTen https://github.com/tink-ab/tink-link-android
See if that works! :)