SignIn with Apple

signin with apple for react native introduction in the last tutorial, you built a user login/logout feature to your app using the \<font color="#2166ae">parse user\</font> class now you will learn how to use apple sign in to retrieve user data from apple and log in, sign up or link existent users with it you will also install and configure \<font color="#2166ae">react native apple authentication\</font> lib to achieve that the \<font color="#2166ae">parse user linkwith\</font> method is responsible for signing up and logging in users using any third party authentication method, as long as you pass the right parameters requested by each different provider after linking the user data to a new or existent \<font color="#2166ae">parse user\</font> , parse will store a valid user session in your device future calls to methods like \<font color="#2166ae">currentasync\</font> will successfully retrieve your user data, just like with regular logins at any time, you can access the complete android project built with this tutorial at our github repositories kotlin example repository https //github com/templates back4app/android parse sdk kotlin java example repository https //github com/templates back4app/android parse sdk java prerequisites to complete this tutorial, you will need a react native app created and connected to back4app https //www back4app com/docs/react native/parse sdk/react native sdk complete the previous guides so you can have a better understanding of the parse user class https //www back4app com/docs/react native/parse sdk/working with users/react native login goal to build a user login feature using apple sign in on parse for a react native app 1 installing dependencies the most popular way to enable apple sign in on react native is using \<font color="#2166ae">react native apple authentication\</font> to handle it since this library configuration depends on your development environment, target platform, and preferences, set it up following the official docs https //github com/invertase/react native apple authentication if you are developing for android, you also need to install the https //github com/auth0/jwt decode library for decoding apple jwt tokens note make sure to thoroughly follow the instructions for initial setup of xcode environment, creating your app id, keys and service id on apple developer portal 2 using apple sign in with parse let’s now create a new method inside the \<font color="#2166ae">userlogin\</font> component calling apple sign in authentication modal the \<font color="#2166ae">react native apple authentication\</font> lib has two separate modules to handle this call based on your user platform, so you need to use \<font color="#2166ae">appleauth performrequest\</font> on ios and \<font color="#2166ae">appleauthandroid signin\</font> on android if the user signs in with apple, this call will retrieve the user data from apple and you need to store the \<font color="#2166ae">id\</font> , \<font color="#2166ae">token\</font> , and apple email for later javascript 1 const douserloginapple = async function () promise\<boolean> { 2 try { 3 let response = {}; 4 let appleid = ''; 5 let appletoken = ''; 6 let appleemail = ''; 7 if (platform os === 'ios') { 8 // performs login request requesting user email 9 response = await appleauth performrequest({ 10 requestedoperation appleauth operation login, 11 requestedscopes \[appleauth scope email], 12 }); 13 // on ios, user id and email are easily retrieved from request 14 appleid = response user; 15 appletoken = response identitytoken; 16 appleemail = response email; 17 } else if (platform os === 'android') { 18 // configure the request 19 appleauthandroid configure({ 20 // the service id you registered with apple 21 clientid 'your service id', 22 // return url added to your apple dev console 23 redirecturi 'your redirect url', 24 responsetype appleauthandroid responsetype all, 25 scope appleauthandroid scope all, 26 }); 27 response = await appleauthandroid signin(); 28 // decode user id and email from token returned from apple, 29 // this is a common workaround for apple sign in via web api 30 const decodedidtoken = jwt decode(response id token); 31 appleid = decodedidtoken sub; 32 appletoken = response id token; 33 appleemail = decodedidtoken email; 34 } 35 // format authdata to provide correctly for apple linkwith on parse 36 const authdata = { 37 id appleid, 38 token appletoken, 39 }; 40 } catch (error) { 41 // error can be caused by wrong parameters or lack of internet connection 42 alert alert('error!', error); 43 return false; 44 } 45 };1 const douserloginapple = async function () promise\<boolean> { 2 try { 3 let response object = {}; 4 let appleid string = ''; 5 let appletoken string = ''; 6 let appleemail string = ''; 7 if (platform os === 'ios') { 8 // performs login request requesting user email 9 response = await appleauth performrequest({ 10 requestedoperation appleauth operation login, 11 requestedscopes \[appleauth scope email], 12 }); 13 // on ios, user id and email are easily retrieved from request 14 appleid = response user; 15 appletoken = response identitytoken; 16 appleemail = response email; 17 } else if (platform os === 'android') { 18 // configure the request 19 appleauthandroid configure({ 20 // the service id you registered with apple 21 clientid 'your service id', 22 // return url added to your apple dev console 23 redirecturi 'your service url', 24 responsetype appleauthandroid responsetype all, 25 scope appleauthandroid scope all, 26 }); 27 response = await appleauthandroid signin(); 28 // decode user id and email from token returned from apple, 29 // this is a common workaround for apple sign in via web api 30 const decodedidtoken object = jwt decode(response id token); 31 appleid = decodedidtoken sub; 32 appletoken = response id token; 33 appleemail = decodedidtoken email; 34 } 35 // format authdata to provide correctly for apple linkwith on parse 36 const authdata object = { 37 id appleid, 38 token appletoken, 39 }; 40 } catch (error any) { 41 // error can be caused by wrong parameters or lack of internet connection 42 alert alert('error!', error); 43 return false; 44 } 45 }; note that for android you need to decode the returning token from apple because the lib \<font color="#2166ae">react native apple authentication\</font> uses apple sign in web api for authentication there are restrictions for data access when using this method, so a common workaround for retrieving your user id and email is through this decoding process, as stated here https //docs parseplatform org/parse server/guide/#apple authdata in the official parse guides after that, you can use \<font color="#2166ae">parse user linkwith\</font> on a new \<font color="#2166ae">parse user\</font> object to register a new user and log in note that if your user had already signed up using this apple authentication, \<font color="#2166ae">linkwith\</font> will log him in using the existent account javascript 1 const douserloginapple = async function () promise\<boolean> { 2 try { 3 let response = {}; 4 let appleid = ''; 5 let appletoken = ''; 6 let appleemail = ''; 7 if (platform os === 'ios') { 8 // performs login request requesting user email 9 response = await appleauth performrequest({ 10 requestedoperation appleauth operation login, 11 requestedscopes \[appleauth scope email], 12 }); 13 // on ios, user id and email are easily retrieved from request 14 appleid = response user; 15 appletoken = response identitytoken; 16 appleemail = response email; 17 } else if (platform os === 'android') { 18 // configure the request 19 appleauthandroid configure({ 20 // the service id you registered with apple 21 clientid 'your service io', 22 // return url added to your apple dev console 23 redirecturi 'your service url', 24 responsetype appleauthandroid responsetype all, 25 scope appleauthandroid scope all, 26 }); 27 response = await appleauthandroid signin(); 28 // decode user id and email from token returned from apple, 29 // this is a common workaround for apple sign in via web api 30 const decodedidtoken = jwt decode(response id token); 31 appleid = decodedidtoken sub; 32 appletoken = response id token; 33 appleemail = decodedidtoken email; 34 } 35 // format authdata to provide correctly for apple linkwith on parse 36 const authdata = { 37 id appleid, 38 token appletoken, 39 }; 40 // log in or sign up on parse using this apple credentials 41 let usertologin = new parse user(); 42 // set username and email to match provider email 43 usertologin set('username', appleemail); 44 usertologin set('email', appleemail); 45 return await usertologin 46 linkwith('apple', { 47 authdata authdata, 48 }) 49 then(async (loggedinuser) => { 50 // login returns the corresponding parseuser object 51 alert alert( 52 'success!', 53 `user ${loggedinuser get('username')} has successfully signed in!`, 54 ); 55 // to verify that this is in fact the current user, currentasync can be used 56 const currentuser = await parse user currentasync(); 57 console log(loggedinuser === currentuser); 58 // navigation navigate takes the user to the screen named after the one 59 // passed as parameter 60 navigation navigate('home'); 61 return true; 62 }) 63 catch(async (error) => { 64 // error can be caused by wrong parameters or lack of internet connection 65 alert alert('error!', error message); 66 return false; 67 }); 68 } catch (error) { 69 // error can be caused by wrong parameters or lack of internet connection 70 alert alert('error!', error); 71 return false; 72 } 73 };1 const douserloginapple = async function () promise\<boolean> { 2 try { 3 let response object = {}; 4 let appleid string = ''; 5 let appletoken string = ''; 6 let appleemail string = ''; 7 if (platform os === 'ios') { 8 // performs login request requesting user email 9 response = await appleauth performrequest({ 10 requestedoperation appleauth operation login, 11 requestedscopes \[appleauth scope email], 12 }); 13 // on ios, user id and email are easily retrieved from request 14 appleid = response user; 15 appletoken = response identitytoken; 16 appleemail = response email; 17 } else if (platform os === 'android') { 18 // configure the request 19 appleauthandroid configure({ 20 // the service id you registered with apple 21 clientid 'com back4app userguide', 22 // return url added to your apple dev console 23 redirecturi 'https //tuhl software/back4appuserguide/', 24 responsetype appleauthandroid responsetype all, 25 scope appleauthandroid scope all, 26 }); 27 response = await appleauthandroid signin(); 28 // decode user id and email from token returned from apple, 29 // this is a common workaround for apple sign in via web api 30 const decodedidtoken object = jwt decode(response id token); 31 appleid = decodedidtoken sub; 32 appletoken = response id token; 33 appleemail = decodedidtoken email; 34 } 35 // format authdata to provide correctly for apple linkwith on parse 36 const authdata object = { 37 id appleid, 38 token appletoken, 39 }; 40 // log in or sign up on parse using this apple credentials 41 let usertologin parse user = new parse user(); 42 // set username and email to match provider email 43 usertologin set('username', appleemail); 44 usertologin set('email', appleemail); 45 return await usertologin 46 linkwith('apple', { 47 authdata authdata, 48 }) 49 then(async (loggedinuser parse user) => { 50 // login returns the corresponding parseuser object 51 alert alert( 52 'success!', 53 `user ${loggedinuser get('username')} has successfully signed in!`, 54 ); 55 // to verify that this is in fact the current user, currentasync can be used 56 const currentuser parse user = await parse user currentasync(); 57 console log(loggedinuser === currentuser); 58 // navigation navigate takes the user to the screen named after the one 59 // passed as parameter 60 navigation navigate('home'); 61 return true; 62 }) 63 catch(async (error object) => { 64 // error can be caused by wrong parameters or lack of internet connection 65 alert alert('error!', error message); 66 return false; 67 }); 68 } catch (error any) { 69 // error can be caused by wrong parameters or lack of internet connection 70 alert alert('error!', error); 71 return false; 72 } 73 }; add this function to your \<font color="#2166ae">usersignin\</font> component and assign it to your apple button \<font color="#2166ae">onpress\</font> parameter go ahead and test your new function note that the user will be redirected to your home screen after successfully registering and/or signing in 3 verifying user sign in and session creation to make sure that the apple sign in worked, you can look at your parse dashboard and see your new \<font color="#2166ae">user\</font> (if your apple authentication data didn’t belong to another user), containing the apple \<font color="#2166ae">authdata\</font> parameters you can also verify that a valid session was created in the dashboard, containing a pointer to that \<font color="#2166ae">user\</font> object 4 linking an existing user to apple sign in another \<font color="#2166ae">linkwith\</font> possible use is to link an existing user with another auth provider, in this case, apple add this function that calls \<font color="#2166ae">linkwith\</font> the same way you did in \<font color="#2166ae">userlogin\</font> to your \<font color="#2166ae">hellouser\</font> component or directly to your home screen the only difference here is that instead of calling the method from an empty \<font color="#2166ae">parse user\</font> , you will use it from the logged in user object javascript 1 const douserlinkapple = async function (){ 2 try { 3 let response = {}; 4 let appleid = ''; 5 let appletoken = ''; 6 if (platform os === 'ios') { 7 // performs login request requesting user email 8 response = await appleauth performrequest({ 9 requestedoperation appleauth operation login, 10 requestedscopes \[appleauth scope email], 11 }); 12 // on ios, user id and email are easily retrieved from request 13 appleid = response user; 14 appletoken = response identitytoken; 15 } else if (platform os === 'android') { 16 // configure the request 17 appleauthandroid configure({ 18 // the service id you registered with apple 19 clientid 'your service id', 20 // return url added to your apple dev console 21 redirecturi 'your redirect url', 22 responsetype appleauthandroid responsetype all, 23 scope appleauthandroid scope all, 24 }); 25 response = await appleauthandroid signin(); 26 // decode user id and email from token returned from apple, 27 // this is a common workaround for apple sign in via web api 28 const decodedidtoken = jwt decode(response id token); 29 appleid = decodedidtoken sub; 30 appletoken = response id token; 31 } 32 // format authdata to provide correctly for apple linkwith on parse 33 const authdata = { 34 id appleid, 35 token appletoken, 36 }; 37 let currentuser = await parse user currentasync(); 38 // link user with his apple credentials 39 return await currentuser 40 linkwith('apple', { 41 authdata authdata, 42 }) 43 then(async (loggedinuser) => { 44 // login returns the corresponding parseuser object 45 alert alert( 46 'success!', 47 `user ${loggedinuser get( 48 'username', 49 )} has successfully linked his apple account!`, 50 ); 51 // to verify that this is in fact the current user, currentasync can be used 52 currentuser = await parse user currentasync(); 53 console log(loggedinuser === currentuser); 54 return true; 55 }) 56 catch(async (error) => { 57 // error can be caused by wrong parameters or lack of internet connection 58 alert alert('error!', error message); 59 return false; 60 }); 61 } catch (error) { 62 // error can be caused by wrong parameters or lack of internet connection 63 alert alert('error!', error); 64 return false; 65 } 66 };1 const douserlinkapple = async function () promise\<boolean> { 2 try { 3 let response object = {}; 4 let appleid string = ''; 5 let appletoken string = ''; 6 if (platform os === 'ios') { 7 // performs login request requesting user email 8 response = await appleauth performrequest({ 9 requestedoperation appleauth operation login, 10 requestedscopes \[appleauth scope email], 11 }); 12 // on ios, user id and email are easily retrieved from request 13 appleid = response user; 14 appletoken = response identitytoken; 15 } else if (platform os === 'android') { 16 // configure the request 17 appleauthandroid configure({ 18 // the service id you registered with apple 19 clientid 'your service id', 20 // return url added to your apple dev console 21 redirecturi 'your service url', 22 responsetype appleauthandroid responsetype all, 23 scope appleauthandroid scope all, 24 }); 25 response = await appleauthandroid signin(); 26 // decode user id and email from token returned from apple, 27 // this is a common workaround for apple sign in via web api 28 const decodedidtoken object = jwt decode(response id token); 29 appleid = decodedidtoken sub; 30 appletoken = response id token; 31 } 32 // format authdata to provide correctly for apple linkwith on parse 33 const authdata object = { 34 id appleid, 35 token appletoken, 36 }; 37 let currentuser parse user = await parse user currentasync(); 38 // link user with his apple credentials 39 return await currentuser 40 linkwith('apple', { 41 authdata authdata, 42 }) 43 then(async (loggedinuser parse user) => { 44 // login returns the corresponding parseuser object 45 alert alert( 46 'success!', 47 `user ${loggedinuser get( 48 'username', 49 )} has successfully linked his apple account!`, 50 ); 51 // to verify that this is in fact the current user, currentasync can be used 52 currentuser = await parse user currentasync(); 53 console log(loggedinuser === currentuser); 54 return true; 55 }) 56 catch(async (error object) => { 57 // error can be caused by wrong parameters or lack of internet connection 58 alert alert('error!', error message); 59 return false; 60 }); 61 } catch (error any) { 62 // error can be caused by wrong parameters or lack of internet connection 63 alert alert('error!', error); 64 return false; 65 } 66 }; assign this function to a apple button \<font color="#2166ae">onpress\</font> parameter on your home screen test your new function, noting that the \<font color="#2166ae">parse user\</font> object \<font color="#2166ae">authdata\</font> value will be updated with the new auth provider data verify if the user has indeed updated in your parse server dashboard conclusion at the end of this guide, you learned how to log in, sign up or link existing parse users on react native using apple sign in with \<font color="#2166ae">react native apple authentication\</font> in the next guide, we will show you how to perform useful user queries