Vincular vários provedores de autenticação a uma conta no Unity
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Ao vincular as credenciais de provedores de autenticação
a contas de usuário existentes, você permite que esses usuários façam login no seu app usando diferentes provedores.
O ID do Firebase identifica usuários de qualquer provedor de
autenticação. Por exemplo, um usuário que fez login
com uma senha pode vincular uma Conta do Google e usar um desses métodos. Ou um usuário anônimo pode vincular uma conta do Facebook
para acessar o app.
Antes de começar
No app, adicione suporte a dois ou mais provedores de autenticação, incluindo
autenticação anônima.
A classe FirebaseAuth é o gateway para todas as chamadas de API.
Ela pode ser acessada por meio de FirebaseAuth.DefaultInstance.
Transmita o objeto Firebase.Auth.Credential ao método LinkWithCredentialAsync do usuário conectado:
auth.CurrentUser.LinkWithCredentialAsync(credential).ContinueWith(task=>{if(task.IsCanceled){Debug.LogError("LinkWithCredentialAsync was canceled.");return;}if(task.IsFaulted){Debug.LogError("LinkWithCredentialAsync encountered an error: "+task.Exception);return;}Firebase.Auth.AuthResultresult=task.Result;Debug.LogFormat("Credentials successfully linked to Firebase user: {0} ({1})",result.User.DisplayName,result.User.UserId);});
A chamada para LinkWithCredentialAsync falhará se as credenciais já estiverem vinculadas a outra conta de usuário. Nesse caso, você precisará mesclar as contas e os dados associados da maneira apropriada para o app:
// Gather data for the currently signed in User.stringcurrentUserId=auth.CurrentUser.UserId;stringcurrentEmail=auth.CurrentUser.Email;stringcurrentDisplayName=auth.CurrentUser.DisplayName;System.UricurrentPhotoUrl=auth.CurrentUser.PhotoUrl;// Sign in with the new credentials.auth.SignInAndRetrieveDataWithCredentialAsync(credential).ContinueWith(task=>{if(task.IsCanceled){Debug.LogError("SignInAndRetrieveDataWithCredentialAsync was canceled.");return;}if(task.IsFaulted){Debug.LogError("SignInAndRetrieveDataWithCredentialAsync encountered an error: "+task.Exception);return;}Firebase.Auth.AuthResultresult=task.Result;Debug.LogFormat("User signed in successfully: {0} ({1})",result.User.DisplayName,result.User.UserId);// TODO: Merge app specific details using the newUser and values from the// previous user, saved above.});
Se a chamada para LinkWithCredentialAsync for concluída, o usuário poderá fazer login com um dos provedores de autenticação vinculados e acessar os dados do Firebase.
Desvincular um provedor de autenticação de uma conta de usuário
É possível desvincular um provedor de autenticação de uma conta para que o usuário não
faça mais login com ele.
Para desvincular um provedor de autenticação de uma conta de usuário, transmita o ID dele ao método
UnlinkAsync. Para receber os códigos dos provedores de autenticação vinculados a um usuário, chame ProviderData.
// Unlink the sign-in provider from the currently active user.// providerIdString is a string identifying a provider,// retrieved via FirebaseAuth.FetchProvidersForEmail().auth.CurrentUser.UnlinkAsync(providerIdString).ContinueWith(task=>{if(task.IsCanceled){Debug.LogError("UnlinkAsync was canceled.");return;}if(task.IsFaulted){Debug.LogError("UnlinkAsync encountered an error: "+task.Exception);return;}// The user has been unlinked from the provider.Firebase.Auth.AuthResultresult=task.Result;Debug.LogFormat("Credentials successfully unlinked from user: {0} ({1})",result.User.DisplayName,result.User.UserId);});
[[["Fácil de entender","easyToUnderstand","thumb-up"],["Meu problema foi resolvido","solvedMyProblem","thumb-up"],["Outro","otherUp","thumb-up"]],[["Não contém as informações de que eu preciso","missingTheInformationINeed","thumb-down"],["Muito complicado / etapas demais","tooComplicatedTooManySteps","thumb-down"],["Desatualizado","outOfDate","thumb-down"],["Problema na tradução","translationIssue","thumb-down"],["Problema com as amostras / o código","samplesCodeIssue","thumb-down"],["Outro","otherDown","thumb-down"]],["Última atualização 2025-09-04 UTC."],[],[],null,["| **Important** : There is a [known issue](https://github.com/firebase/firebase-js-sdk/issues/7675) that prevents `linkWithCredentials()` from working correctly in some projects. See the issue report for a workaround and the status of a fix.\n\nYou can allow users to sign in to your app using multiple authentication\nproviders by linking auth provider credentials to an existing user account.\nUsers are identifiable by the same Firebase user ID regardless of the\nauthentication provider they used to sign in. For example, a user who signed in\nwith a password can link a Google account and sign in with either method in the\nfuture. Or, an anonymous user can link a Facebook account and then, later, sign\nin with Facebook to continue using your app.\n\nBefore you begin\n\nAdd support for two or more authentication providers (possibly including\nanonymous authentication) to your app.\nThe `FirebaseAuth` class is the gateway for all API calls. It is accessible through [FirebaseAuth.DefaultInstance](/docs/reference/unity/class/firebase/auth/firebase-auth#defaultinstance). \n\n```c#\nFirebase.Auth.FirebaseAuth auth = Firebase.Auth.FirebaseAuth.DefaultInstance;\n```\n\nLink auth provider credentials to a user account\n\nTo link auth provider credentials to an existing user account:\n\n1. Sign in the user using any authentication provider or method.\n2. Complete the sign-in flow for the new authentication provider up to, but not including, calling one of the [`Firebase.Auth.FirebaseAuth.SignInAndRetrieveDataWithCredentialAsync`](/docs/reference/unity/class/firebase/auth/firebase-auth#signinandretrievedatawithcredentialasync) methods. For example, get the user's Google ID token, Facebook access token, or email and password.\n3. Get a `Firebase.Auth.Credential` for the new authentication provider:\n\n **Google Sign-In** \n\n ```c#\n Firebase.Auth.Credential credential =\n Firebase.Auth.GoogleAuthProvider.GetCredential(googleIdToken, googleAccessToken);\n ```\n **Facebook Login** \n\n ```c#\n Firebase.Auth.Credential credential =\n Firebase.Auth.FacebookAuthProvider.GetCredential(accessToken);\n ```\n **Email-password sign-in** \n\n ```c#\n Firebase.Auth.Credential credential =\n Firebase.Auth.EmailAuthProvider.GetCredential(email, password);\n ```\n4. Pass the `Firebase.Auth.Credential` object to the signed-in user's\n `LinkWithCredentialAsync` method:\n\n ```c#\n auth.CurrentUser.LinkWithCredentialAsync(credential).ContinueWith(task =\u003e {\n if (task.IsCanceled) {\n Debug.LogError(\"LinkWithCredentialAsync was canceled.\");\n return;\n }\n if (task.IsFaulted) {\n Debug.LogError(\"LinkWithCredentialAsync encountered an error: \" + task.Exception);\n return;\n }\n\n Firebase.Auth.AuthResult result = task.Result;\n Debug.LogFormat(\"Credentials successfully linked to Firebase user: {0} ({1})\",\n result.User.DisplayName, result.User.UserId);\n });\n ```\n\n The call to `LinkWithCredentialAsync` will fail if the credentials are\n already linked to another user account. In this situation, you must handle\n merging the accounts and associated data as appropriate for your app: \n\n ```c#\n // Gather data for the currently signed in User.\n string currentUserId = auth.CurrentUser.UserId;\n string currentEmail = auth.CurrentUser.Email;\n string currentDisplayName = auth.CurrentUser.DisplayName;\n System.Uri currentPhotoUrl = auth.CurrentUser.PhotoUrl;\n\n // Sign in with the new credentials.\n auth.SignInAndRetrieveDataWithCredentialAsync(credential).ContinueWith(task =\u003e {\n if (task.IsCanceled) {\n Debug.LogError(\"SignInAndRetrieveDataWithCredentialAsync was canceled.\");\n return;\n }\n if (task.IsFaulted) {\n Debug.LogError(\"SignInAndRetrieveDataWithCredentialAsync encountered an error: \" + task.Exception);\n return;\n }\n\n Firebase.Auth.AuthResult result = task.Result;\n Debug.LogFormat(\"User signed in successfully: {0} ({1})\",\n result.User.DisplayName, result.User.UserId);\n\n // TODO: Merge app specific details using the newUser and values from the\n // previous user, saved above.\n });\n ```\n\nIf the call to `LinkWithCredentialAsync` succeeds, the user can now sign in using\nany linked authentication provider and access the same Firebase data.\n\nUnlink an auth provider from a user account\n\nYou can unlink an auth provider from an account, so that the user can no\nlonger sign in with that provider.\n\nTo unlink an auth provider from a user account, pass the provider ID to the\n`UnlinkAsync` method. You can get the provider IDs of the auth\nproviders linked to a user by calling\n[`ProviderData`](/docs/reference/unity/class/firebase/auth/firebase-user#providerdata). \n\n```c#\n// Unlink the sign-in provider from the currently active user.\n// providerIdString is a string identifying a provider,\n// retrieved via FirebaseAuth.FetchProvidersForEmail().\nauth.CurrentUser.UnlinkAsync(providerIdString).ContinueWith(task =\u003e {\n if (task.IsCanceled) {\n Debug.LogError(\"UnlinkAsync was canceled.\");\n return;\n }\n if (task.IsFaulted) {\n Debug.LogError(\"UnlinkAsync encountered an error: \" + task.Exception);\n return;\n }\n\n // The user has been unlinked from the provider.\n Firebase.Auth.AuthResult result = task.Result;\n Debug.LogFormat(\"Credentials successfully unlinked from user: {0} ({1})\",\n result.User.DisplayName, result.User.UserId);\n});\n```\n\nTroubleshooting\n\nIf you encounter errors when trying to link multiple accounts, see the\n[documentation on\nverified email addresses](https://firebase.google.com/docs/auth/users#verified_email_addresses)."]]