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38 changes: 38 additions & 0 deletions
38
app/src/main/java/de/westnordost/streetcomplete/screens/user/login/LoginViewModel.kt
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| package de.westnordost.streetcomplete.screens.user.login | ||
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| import androidx.lifecycle.ViewModel | ||
| import kotlinx.coroutines.flow.StateFlow | ||
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| abstract class LoginViewModel : ViewModel() { | ||
| abstract val unsyncedChangesCount: StateFlow<Int> | ||
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| abstract val loginState: StateFlow<LoginState> | ||
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| abstract val authorizationRequestUrl: String | ||
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| /** Starts the OAuth2 based login flow. */ | ||
| abstract fun startLogin() | ||
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| /** Call when the web view / browser received an error when loading the (authorization) page */ | ||
| abstract fun failAuthorization(url: String, errorCode: Int, description: String?) | ||
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| /** Returns whether the url is a redirect url destined for this OAuth authorization flow */ | ||
| abstract fun isAuthorizationResponseUrl(url: String): Boolean | ||
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| /** Continues OAuth authorization flow with given redirect url */ | ||
| abstract fun finishAuthorization(authorizationResponseUrl: String) | ||
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| /** Resets the login state to LoggedOut. Only works if current state is LoginError */ | ||
| abstract fun resetLogin() | ||
| } | ||
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| sealed interface LoginState | ||
| data object LoggedOut : LoginState | ||
| data object RequestingAuthorization : LoginState | ||
| data object RetrievingAccessToken : LoginState | ||
| enum class LoginError : LoginState { | ||
| RequiredPermissionsNotGranted, | ||
| CommunicationError | ||
| } | ||
| data object LoggedIn : LoginState | ||
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105 changes: 105 additions & 0 deletions
105
app/src/main/java/de/westnordost/streetcomplete/screens/user/login/LoginViewModelImpl.kt
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,105 @@ | ||
| package de.westnordost.streetcomplete.screens.user.login | ||
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| import de.westnordost.streetcomplete.data.UnsyncedChangesCountSource | ||
| import de.westnordost.streetcomplete.data.user.OAUTH2_AUTHORIZATION_URL | ||
| import de.westnordost.streetcomplete.data.user.OAUTH2_CLIENT_ID | ||
| import de.westnordost.streetcomplete.data.user.OAUTH2_REDIRECT_URI | ||
| import de.westnordost.streetcomplete.data.user.OAUTH2_REQUESTED_SCOPES | ||
| import de.westnordost.streetcomplete.data.user.OAUTH2_REQUIRED_SCOPES | ||
| import de.westnordost.streetcomplete.data.user.OAUTH2_TOKEN_URL | ||
| import de.westnordost.streetcomplete.data.user.UserLoginStatusController | ||
| import de.westnordost.streetcomplete.data.user.UserUpdater | ||
| import de.westnordost.streetcomplete.data.user.oauth.OAuthAuthorizationParams | ||
| import de.westnordost.streetcomplete.data.user.oauth.OAuthException | ||
| import de.westnordost.streetcomplete.data.user.oauth.OAuthService | ||
| import de.westnordost.streetcomplete.data.user.oauth.extractAuthorizationCode | ||
| import de.westnordost.streetcomplete.util.ktx.launch | ||
| import de.westnordost.streetcomplete.util.logs.Log | ||
| import kotlinx.coroutines.Dispatchers.IO | ||
| import kotlinx.coroutines.flow.MutableStateFlow | ||
| import kotlinx.coroutines.flow.update | ||
| import kotlinx.coroutines.withContext | ||
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| class LoginViewModelImpl( | ||
| private val unsyncedChangesCountSource: UnsyncedChangesCountSource, | ||
| private val userLoginStatusController: UserLoginStatusController, | ||
| private val oAuthService: OAuthService, | ||
| private val userUpdater: UserUpdater | ||
| ) : LoginViewModel() { | ||
| override val loginState = MutableStateFlow<LoginState>(LoggedOut) | ||
| override val unsyncedChangesCount = MutableStateFlow(0) | ||
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| override val authorizationRequestUrl: String get() = oAuth.authorizationRequestUrl | ||
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| private val oAuth = OAuthAuthorizationParams( | ||
| OAUTH2_AUTHORIZATION_URL, | ||
| OAUTH2_TOKEN_URL, | ||
| OAUTH2_CLIENT_ID, | ||
| OAUTH2_REQUESTED_SCOPES, | ||
| OAUTH2_REDIRECT_URI | ||
| ) | ||
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| init { | ||
| launch(IO) { | ||
| unsyncedChangesCount.update { unsyncedChangesCountSource.getCount() } | ||
| } | ||
| } | ||
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| override fun startLogin() { | ||
| loginState.compareAndSet(LoggedOut, RequestingAuthorization) | ||
| } | ||
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| override fun failAuthorization(url: String, errorCode: Int, description: String?) { | ||
| Log.e(TAG, "Error for URL " + url + if (description != null) ": $description" else "") | ||
| loginState.compareAndSet(RequestingAuthorization, LoginError.CommunicationError) | ||
| } | ||
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| override fun isAuthorizationResponseUrl(url: String): Boolean = | ||
| oAuth.itsForMe(url) | ||
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| override fun finishAuthorization(authorizationResponseUrl: String) { | ||
| launch { | ||
| val accessToken = retrieveAccessToken(authorizationResponseUrl) | ||
| if (accessToken != null) { | ||
| login(accessToken) | ||
| } | ||
| } | ||
| } | ||
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| private suspend fun retrieveAccessToken(authorizationResponseUrl: String): String? { | ||
| try { | ||
| loginState.value = RetrievingAccessToken | ||
| val authorizationCode = extractAuthorizationCode(authorizationResponseUrl) | ||
| val accessTokenResponse = withContext(IO) { | ||
| oAuthService.retrieveAccessToken(oAuth, authorizationCode) | ||
| } | ||
| if (accessTokenResponse.grantedScopes?.containsAll(OAUTH2_REQUIRED_SCOPES) == false) { | ||
| loginState.value = LoginError.RequiredPermissionsNotGranted | ||
| return null | ||
| } | ||
| return accessTokenResponse.accessToken | ||
| } catch (e: Exception) { | ||
| if (e is OAuthException && e.error == "access_denied") { | ||
| loginState.value = LoginError.RequiredPermissionsNotGranted | ||
| } else { | ||
| Log.e(TAG, "Error during authorization", e) | ||
| loginState.value = LoginError.CommunicationError | ||
| } | ||
| return null | ||
| } | ||
| } | ||
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| private suspend fun login(accessToken: String) { | ||
| loginState.value = LoggedIn | ||
| userLoginStatusController.logIn(accessToken) | ||
| userUpdater.update() | ||
| } | ||
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| override fun resetLogin() { | ||
| if (loginState.value is LoginError) loginState.value = LoggedOut | ||
| } | ||
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| companion object { | ||
| private const val TAG = "Login" | ||
| } | ||
| } |
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