NFC-50 Display parsed Web EID auth payload in WebEidScreen after URI handling

Author: SanderKondratjevNortal

app/src/main/kotlin/ee/ria/DigiDoc/RIADigiDocAppNavigation.kt

@@ -381,6 +381,7 @@ fun RIADigiDocAppScreen(externalFileUris: List<Uri>, webEidUri: Uri? = null) {
             WebEidFragment(
                 modifier = Modifier.safeDrawingPadding(),
                 navController = navController,
+                webEidUri = webEidUri,
             )
         }
     }

app/src/main/kotlin/ee/ria/DigiDoc/fragment/WebEidFragment.kt

@@ -3,11 +3,13 @@
 package ee.ria.DigiDoc.fragment
 
 import android.content.res.Configuration
+import android.net.Uri
 import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.ui.ExperimentalComposeUiApi
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.testTag
@@ -26,8 +28,14 @@ import ee.ria.DigiDoc.viewmodel.WebEidViewModel
 fun WebEidFragment(
     modifier: Modifier = Modifier,
     navController: NavHostController,
+    webEidUri: Uri?,
     viewModel: WebEidViewModel = hiltViewModel(),
 ) {
+    LaunchedEffect(webEidUri) {
+        println("DEBUG: WebEidFragment got URI = $webEidUri")
+        webEidUri?.let { viewModel.handleAuth(it) }
+    }
+
     Surface(
         modifier =
             modifier
@@ -52,6 +60,7 @@ fun WebEidFragmentPreview() {
     RIADigiDocTheme {
         WebEidFragment(
             navController = rememberNavController(),
+            webEidUri = null
         )
     }
 }

app/src/main/kotlin/ee/ria/DigiDoc/fragment/screen/WebEidScreen.kt

@@ -4,17 +4,22 @@ package ee.ria.DigiDoc.fragment.screen
 
 import android.content.res.Configuration
 import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.testTag
 import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.semantics.testTagsAsResourceId
 import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.dp
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.navigation.NavHostController
 import androidx.navigation.compose.rememberNavController
@@ -27,6 +32,8 @@ fun WebEidScreen(
     navController: NavHostController,
     viewModel: WebEidViewModel,
 ) {
+    val auth = viewModel.authPayload.collectAsState().value
+
     Surface(
         modifier =
             modifier
@@ -36,8 +43,16 @@ fun WebEidScreen(
                 .testTag("webEidScreen"),
         color = MaterialTheme.colorScheme.background,
     ) {
-        Box(modifier = Modifier.fillMaxSize()) {
-            Text("Web eID Screen placeholder")
+        Box(modifier = Modifier.fillMaxSize().padding(16.dp)) {
+            if (auth != null) {
+                Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
+                    Text("Challenge: ${auth.challenge}")
+                    Text("Login URI: ${auth.loginUri}")
+                    Text("Get Signing Cert: ${auth.getSigningCertificate}")
+                }
+            } else {
+                Text("No auth payload received.")
+            }
         }
     }
 }

app/src/main/kotlin/ee/ria/DigiDoc/viewmodel/WebEidViewModel.kt

@@ -2,13 +2,50 @@
 
 package ee.ria.DigiDoc.viewmodel
 
+import android.net.Uri
 import androidx.lifecycle.ViewModel
 import dagger.hilt.android.lifecycle.HiltViewModel
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import org.json.JSONObject
+import java.util.Base64
 import javax.inject.Inject
 
 @HiltViewModel
 class WebEidViewModel
 @Inject
 constructor() : ViewModel() {
 
+    private val _authPayload = MutableStateFlow<AuthRequest?>(null)
+    val authPayload: StateFlow<AuthRequest?> = _authPayload
+
+    fun handleAuth(uri: Uri) {
+        try {
+            val fragment = uri.fragment ?: return
+            val decoded = decodeBase64(fragment)
+            val json = JSONObject(decoded)
+
+            val challenge = json.getString("challenge")
+            val loginUri = json.getString("login_uri")
+            val getSigningCertificate = json.optBoolean("get_signing_certificate", false)
+
+            _authPayload.value = AuthRequest(
+                challenge = challenge,
+                loginUri = loginUri,
+                getSigningCertificate = getSigningCertificate
+            )
+        } catch (e: Exception) {
+            _authPayload.value = null
+        }
+    }
+
+    private fun decodeBase64(encoded: String): String {
+        return String(Base64.getDecoder().decode(encoded))
+    }
+
+    data class AuthRequest(
+        val challenge: String,
+        val loginUri: String,
+        val getSigningCertificate: Boolean = false
+    )
 }