Add CacheControl to MainActivity and OkhttpTest

- Add CacheControl.FORCE_NETWORK to MainActivity
- Update CustomCertManager to return emptyArray
- Create new OkhttpTest with CacheControl

Author: rfc2822

lib/src/androidTest/java/at/bitfire/cert4android/OkhttpTest.kt

@@ -0,0 +1,61 @@
+package at.bitfire.cert4android
+
+import androidx.test.platform.app.InstrumentationRegistry
+import okhttp3.Cache
+import okhttp3.CacheControl
+import okhttp3.OkHttpClient
+import okhttp3.Request
+import okhttp3.internal.tls.OkHostnameVerifier
+import org.junit.Assert.assertEquals
+import org.junit.Test
+import javax.net.ssl.SSLContext
+
+class OkhttpTest {
+
+    private val context by lazy { InstrumentationRegistry.getInstrumentation().targetContext }
+
+    @Test
+    fun testAccessICloudComWithCache() {
+        val client = buildClient()
+
+        // access sample URL
+        val call = client.newCall(
+            Request.Builder()
+                .get()
+                .cacheControl(CacheControl.FORCE_NETWORK)   // don't retrieve from cache, the problem is storing to cache
+                .url("https://icloud.com")
+                .build()
+        )
+        call.execute().use { response ->
+            assertEquals(200, response.code)
+        }
+    }
+
+
+    fun buildClient(): OkHttpClient {
+        val builder = OkHttpClient.Builder()
+
+        // set cert4android TrustManager and HostnameVerifier
+        val certManager = CustomCertManager(
+            context,
+            trustSystemCerts = true,
+            appInForeground = null
+        )
+
+        val sslContext = SSLContext.getInstance("TLS")
+        sslContext.init(
+            /* km = */ null,
+            /* tm = */ arrayOf(certManager),
+            /* random = */ null
+        )
+        builder
+            .sslSocketFactory(sslContext.socketFactory, certManager)
+            .hostnameVerifier(certManager.HostnameVerifier(OkHostnameVerifier))
+
+        // add cache
+        builder.cache(Cache(context.cacheDir, 10 * 1024 * 1024))
+
+        return builder.build()
+    }
+
+}

lib/src/main/java/at/bitfire/cert4android/CustomCertManager.kt

@@ -55,7 +55,7 @@ class CustomCertManager @JvmOverloads constructor(
             throw CertificateException("Certificate chain not trusted")
     }
 
-    override fun getAcceptedIssuers() = arrayOf<X509Certificate>()
+    override fun getAcceptedIssuers() = emptyArray<X509Certificate>()
 
 
     /**

sample-app/src/main/java/at/bitfire/cert4android/demo/MainActivity.kt

@@ -37,6 +37,7 @@ import at.bitfire.cert4android.ThemeManager
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.launch
+import okhttp3.CacheControl
 import okhttp3.OkHttpClient
 import okhttp3.Request
 import okhttp3.internal.tls.OkHostnameVerifier
@@ -155,6 +156,7 @@ class MainActivity : ComponentActivity() {
                 val call = client.newCall(
                     Request.Builder()
                         .get()
+                        .cacheControl(CacheControl.FORCE_NETWORK)
                         .url(url)
                         .build()
                 )