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Add FirebaseAuth plumbing - show current user icon.
Major changes: I had to introduce an `ObservableUseCase` class to handle situations where a producer will continue to emit events to the LiveData. The overall design works the same as UseCase. Added Repository and data classes to interact with firebase. Added UI for login/logout. BUG: 74200462 Change-Id: If51891513163614b591a57c8b070ff21c5735841
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104 changes: 104 additions & 0 deletions
104
mobile/src/main/java/com/google/samples/apps/iosched/ui/login/LoginViewModelPlugin.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,104 @@ | ||
| /* | ||
| * Copyright 2018 Google LLC | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * https://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| package com.google.samples.apps.iosched.ui.login | ||
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|
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| import android.arch.lifecycle.LiveData | ||
| import android.arch.lifecycle.MutableLiveData | ||
| import android.net.Uri | ||
| import com.google.firebase.auth.FirebaseUser | ||
| import com.google.samples.apps.iosched.shared.domain.login.ObservableFirebaseUserUseCase | ||
| import com.google.samples.apps.iosched.shared.result.Result | ||
| import com.google.samples.apps.iosched.shared.result.Result.Success | ||
| import com.google.samples.apps.iosched.shared.util.checkAllMatched | ||
| import com.google.samples.apps.iosched.shared.util.map | ||
| import com.google.samples.apps.iosched.ui.login.LoginEvent.RequestLogin | ||
| import com.google.samples.apps.iosched.ui.login.LoginEvent.RequestLogout | ||
| import com.google.samples.apps.iosched.ui.schedule.Event | ||
| import javax.inject.Inject | ||
|
|
||
| enum class LoginEvent { | ||
| RequestLogin, RequestLogout | ||
| } | ||
|
|
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| /** | ||
| * Interface to implement login functionality in a ViewModel. | ||
| * | ||
| * You can inject a implementation of this via Dagger2, then use the implementation as an interface | ||
| * delegate to add login functionality without writing any code | ||
| * | ||
| * Example usage | ||
| * | ||
| * ``` | ||
| * class MyViewModel @Inject constructor( | ||
| * loginViewModelComponent: LoginViewModelPlugin | ||
| * ) : ViewModel(), LoginViewModelPlugin by loginViewModelComponent { | ||
| * ``` | ||
| */ | ||
| interface LoginViewModelPlugin { | ||
| /** | ||
| * Live updated value of the current firebase user | ||
| */ | ||
| val currentFirebaseUser: MutableLiveData<Result<FirebaseUser?>> | ||
|
|
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| /** | ||
| * Live updated value of the current firebase users image url | ||
| */ | ||
| val currentUserImageUri: LiveData<Uri?> | ||
|
|
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| /** | ||
| * Emits Events when a login event should be attempted | ||
| */ | ||
| val performLoginEvent: MutableLiveData<Event<LoginEvent>> | ||
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| fun isLoggedIn(): Boolean { | ||
| val currentUser = currentFirebaseUser.value | ||
| return when (currentUser) { | ||
| is Success -> currentUser.data != null | ||
| else -> false | ||
| }.checkAllMatched | ||
| } | ||
|
|
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| /** | ||
| * Emit an Event on performLoginEvent to request login | ||
| */ | ||
| fun emitLoginRequest() = performLoginEvent.postValue(Event(RequestLogin)) | ||
|
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| /** | ||
| * Emit an Event on performLoginEvent to request logout | ||
| */ | ||
| fun emitLogoutRequest() = performLoginEvent.postValue(Event(RequestLogout)) | ||
| } | ||
|
|
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| /** | ||
| * Implementation of LoginViewModel that can be used as an interface delegate. | ||
| */ | ||
| internal class LoginViewModelPluginImpl @Inject constructor( | ||
| observableFirebaseUserUseCase: ObservableFirebaseUserUseCase | ||
| ) : LoginViewModelPlugin { | ||
| override val performLoginEvent = MutableLiveData<Event<LoginEvent>>() | ||
| override val currentFirebaseUser = MutableLiveData<Result<FirebaseUser?>>() | ||
| override val currentUserImageUri: LiveData<Uri?> = currentFirebaseUser.map { result -> | ||
| when (result) { | ||
| is Success -> result.data?.photoUrl | ||
| else -> null | ||
| } | ||
| } | ||
|
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| init { | ||
| observableFirebaseUserUseCase(Unit, currentFirebaseUser) | ||
| } | ||
| } |
31 changes: 31 additions & 0 deletions
31
mobile/src/main/java/com/google/samples/apps/iosched/ui/login/LoginViewModelPluginModule.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| /* | ||
| * Copyright 2018 Google LLC | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * https://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
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| package com.google.samples.apps.iosched.ui.login | ||
|
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| import com.google.samples.apps.iosched.shared.domain.login.ObservableFirebaseUserUseCase | ||
| import dagger.Module | ||
| import dagger.Provides | ||
|
|
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| @Module | ||
| class LoginViewModelPluginModule { | ||
|
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| @Provides | ||
| fun provideLoginViewModelPlugin(observableFirebaseUserUseCase: ObservableFirebaseUserUseCase): | ||
| LoginViewModelPlugin { | ||
| return LoginViewModelPluginImpl(observableFirebaseUserUseCase) | ||
| } | ||
| } |
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