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* - Redirection code implemented
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106 changes: 106 additions & 0 deletions
106
app/src/main/java/com/kickstarter/viewmodels/OAuthViewModel.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| package com.kickstarter.viewmodels | ||
|
|
||
| import android.content.Intent | ||
| import android.net.Uri | ||
| import androidx.lifecycle.ViewModel | ||
| import androidx.lifecycle.ViewModelProvider | ||
| import androidx.lifecycle.viewModelScope | ||
| import com.kickstarter.libs.ApiEndpoint | ||
| import com.kickstarter.libs.Environment | ||
| import com.kickstarter.libs.utils.CodeVerifier | ||
| import com.kickstarter.libs.utils.PKCE | ||
| import com.kickstarter.libs.utils.Secrets | ||
| import kotlinx.coroutines.flow.MutableStateFlow | ||
| import kotlinx.coroutines.flow.SharingStarted | ||
| import kotlinx.coroutines.flow.StateFlow | ||
| import kotlinx.coroutines.flow.asStateFlow | ||
| import kotlinx.coroutines.flow.stateIn | ||
| import kotlinx.coroutines.launch | ||
| import timber.log.Timber | ||
|
|
||
| /** | ||
| * UiState for the OAuthScreen. | ||
| * @param authorizationUrl = Url to be loaded withing the ChromeTabs with all PKCE params | ||
| * @param code = code retrieved from the redirect deeplink, once the user has logged in successfully on ChromeTabs | ||
| */ | ||
| data class OAuthUiState( | ||
| val authorizationUrl: String = "", | ||
| val code: String = "", | ||
| val isAuthorizationStep: Boolean = false, | ||
| val isTokenRetrieveStep: Boolean = false | ||
| ) | ||
| class OAuthViewModel( | ||
| private val environment: Environment, | ||
| private val verifier: PKCE | ||
| ) : ViewModel() { | ||
|
|
||
| private val hostEndpoint = environment.webEndpoint() | ||
| private val clientID = if (hostEndpoint == ApiEndpoint.PRODUCTION.name) Secrets.Api.Client.PRODUCTION else Secrets.Api.Client.STAGING | ||
| private val codeVerifier = verifier.generateRandomCodeVerifier(entropy = CodeVerifier.MAX_CODE_VERIFIER_ENTROPY) | ||
|
|
||
| private var mutableUIState = MutableStateFlow(OAuthUiState()) | ||
| val uiState: StateFlow<OAuthUiState> | ||
| get() = mutableUIState.asStateFlow() | ||
| .stateIn( | ||
| scope = viewModelScope, | ||
| started = SharingStarted.WhileSubscribed(), | ||
| initialValue = OAuthUiState() | ||
| ) | ||
| fun produceState(intent: Intent) { | ||
| viewModelScope.launch { | ||
| val uri = Uri.parse(intent.data.toString()) | ||
| val scheme = uri.scheme | ||
| val host = uri.host | ||
| val code = uri.getQueryParameter("code") | ||
|
|
||
| if (scheme == REDIRECT_URI_SCHEMA && host == REDIRECT_URI_HOST && code != null) { | ||
| Timber.d("isTokenRetrieveStep after redirectionDeeplink: $code") | ||
| mutableUIState.emit( | ||
| OAuthUiState( | ||
| code = code, | ||
| isTokenRetrieveStep = true, | ||
| isAuthorizationStep = false | ||
| ) | ||
| ) | ||
| // TODO: will call with code and code_challenge once the backend is ready to call the tokenEndpoint | ||
| } | ||
|
|
||
| if (intent.data == null) { | ||
| val url = generateAuthorizationUrlWithParams() | ||
| Timber.d("isAuthorizationStep $url") | ||
| mutableUIState.emit( | ||
| OAuthUiState( | ||
| authorizationUrl = url, | ||
| isAuthorizationStep = true, | ||
| isTokenRetrieveStep = false | ||
| ) | ||
| ) | ||
| } | ||
| } | ||
| } | ||
| private fun generateAuthorizationUrlWithParams(): String { | ||
| val authParams = mapOf( | ||
| "redirect_uri" to REDIRECT_URI_SCHEMA, | ||
| "scope" to "1", // profile/email | ||
| "client_id" to clientID, | ||
| "response_type" to "1", // code | ||
| "code_challenge" to verifier.generateCodeChallenge(codeVerifier), | ||
| "code_challenge_method" to "S256" | ||
| ).map { (k, v) -> "${(k)}=$v" }.joinToString("&") | ||
| return "$hostEndpoint/oauth/authorizations/new?$authParams" | ||
| } | ||
|
|
||
| private companion object { | ||
| const val REDIRECT_URI_SCHEMA = "ksrauth2" | ||
| const val REDIRECT_URI_HOST = "authenticate" | ||
| } | ||
| } | ||
|
|
||
| class OAuthViewModelFactory( | ||
| private val environment: Environment, | ||
| private val verifier: PKCE = CodeVerifier() | ||
| ) : ViewModelProvider.Factory { | ||
| override fun <T : ViewModel> create(modelClass: Class<T>): T { | ||
| return OAuthViewModel(environment, verifier = verifier) as T | ||
| } | ||
| } |
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