Added view of trusted issuer certificates to verifier app

appverifier/src/main/java/com/android/mdl/appreader/fragment/ViewTruststoreFragment.kt

@@ -0,0 +1,73 @@
+package com.android.mdl.appreader.fragment
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedCard
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.ComposeView
+import androidx.compose.ui.unit.dp
+import androidx.fragment.app.Fragment
+import com.android.mdl.appreader.theme.ReaderAppTheme
+import com.android.mdl.appreader.util.KeysAndCertificates
+import java.security.cert.X509Certificate
+import java.time.Instant
+
+class ViewTruststoreFragment : Fragment() {
+  override fun onCreateView(
+    inflater: LayoutInflater,
+    container: ViewGroup?,
+    savedInstanceState: Bundle?,
+  ): View {
+    val trustedCertificates = KeysAndCertificates.getTrustedIssuerCertificates(requireContext())
+    return ComposeView(requireContext()).apply {
+      setContent {
+        ReaderAppTheme {
+          CertificatesList(trustedCertificates)
+        }
+      }
+    }
+  }
+}
+
+@Composable
+private fun CertificatesList(certificates: List<X509Certificate>) {
+  val now = Instant.now()
+  val padding = Modifier.padding(horizontal = 2.dp)
+  val colorRegular = MaterialTheme.colorScheme.onBackground
+  val colorError = MaterialTheme.colorScheme.error
+
+  Column(modifier = Modifier.verticalScroll(state = rememberScrollState())) {
+    certificates.forEach { certificate ->
+      OutlinedCard(modifier = Modifier.fillMaxWidth()) {
+        Text(
+          text = certificate.subjectDN.toString(),
+          style = MaterialTheme.typography.bodyMedium,
+          color = colorRegular,
+          modifier = padding
+        )
+        Text(
+          text = "Not before: " + certificate.notBefore.toString(),
+          style = MaterialTheme.typography.bodyMedium,
+          color = if (now > certificate.notBefore.toInstant()) colorRegular else colorError,
+          modifier = padding
+        )
+        Text(
+          text = "Not after: " + certificate.notAfter.toString(),
+          style = MaterialTheme.typography.bodyMedium,
+          color = if (now < certificate.notAfter.toInstant()) colorRegular else colorError,
+          modifier = padding
+        )
+      }
+    }
+  }
+}

appverifier/src/main/res/drawable/ic_truststore.xml

@@ -0,0 +1,7 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path android:fillColor="@android:color/white" android:pathData="M12.65,10C11.83,7.67 9.61,6 7,6c-3.31,0 -6,2.69 -6,6s2.69,6 6,6c2.61,0 4.83,-1.67 5.65,-4H17v4h4v-4h2v-4H12.65zM7,14c-1.1,0 -2,-0.9 -2,-2s0.9,-2 2,-2 2,0.9 2,2 -0.9,2 -2,2z"/>
+</vector>

appverifier/src/main/res/menu/side_navigation_menu.xml

@@ -14,7 +14,12 @@
         android:enabled="true"
         android:icon="@drawable/ic_present_document"
         android:title="@string/menu_reverse_engagement" />
-
+    <item
+        android:id="@+id/viewTruststore"
+        android:checkable="true"
+        android:enabled="true"
+        android:icon="@drawable/ic_truststore"
+        android:title="@string/menu_view_truststore" />
     <item
         android:id="@+id/settings"
         android:checkable="true"

appverifier/src/main/res/navigation/nav_graph.xml

@@ -135,4 +135,12 @@
             android:id="@+id/action_ShowQr_to_Transfer"
             app:destination="@id/transfer" />
     </fragment>
+    <fragment
+        android:id="@+id/viewTruststore"
+        android:name="com.android.mdl.appreader.fragment.ViewTruststoreFragment"
+        android:label="View Truststore">
+        <action
+            android:id="@+id/action_viewTruststoreFragment_to_RequestOptions"
+            app:destination="@id/requestOptions" />
+    </fragment>
 </navigation>

appverifier/src/main/res/values/strings.xml

@@ -107,5 +107,6 @@
     <string name="menu_reader_home">Home</string>
     <string name="menu_reverse_engagement">Reverse Engagement</string>
     <string name="menu_settings">Settings</string>
+    <string name="menu_view_truststore">View Truststore</string>
 
 </resources>