Configure script based on remote config

app/src/main/java/com/duckduckgo/app/browser/BrowserTabFragment.kt

@@ -329,7 +329,7 @@ import com.duckduckgo.savedsites.api.models.SavedSitesNames
 import com.duckduckgo.savedsites.impl.bookmarks.BookmarksBottomSheetDialog
 import com.duckduckgo.savedsites.impl.bookmarks.FaviconPromptSheet
 import com.duckduckgo.savedsites.impl.dialogs.EditSavedSiteDialogFragment
-import com.duckduckgo.serp.logos.api.SerpLogoScreens.*
+import com.duckduckgo.serp.logos.api.SerpLogoScreens.EasterEggLogoScreen
 import com.duckduckgo.serp.logos.api.SerpLogos
 import com.duckduckgo.site.permissions.api.SitePermissionsDialogLauncher
 import com.duckduckgo.site.permissions.api.SitePermissionsGrantedListener
@@ -599,6 +599,9 @@ class BrowserTabFragment :
     @Inject
     lateinit var omnibarFeatureRepository: OmnibarFeatureRepository
 
+    @Inject
+    lateinit var webViewCompatTestHelper: WebViewCompatTestHelper
+
     /**
      * We use this to monitor whether the user was seeing the in-context Email Protection signup prompt
      * This is needed because the activity stack will be cleared if an external link is opened in our browser
@@ -3246,6 +3249,9 @@ class BrowserTabFragment :
                 onInContextEmailProtectionSignupPromptShown = { showNativeInContextEmailProtectionSignupPrompt() },
             )
             configureWebViewForBlobDownload(it)
+            lifecycleScope.launch {
+                webViewCompatTestHelper.configureWebViewForWebViewCompatTest(it)
+            }
             configureWebViewForAutofill(it)
             printInjector.addJsInterface(it) { viewModel.printFromWebView() }
             autoconsent.addJsInterface(it, autoconsentCallback)

app/src/main/java/com/duckduckgo/app/browser/WebViewCompatTestHelper.kt

@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2025 DuckDuckGo
+ *
+ * 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
+ *
+ *     http://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.duckduckgo.app.browser
+
+import com.duckduckgo.app.browser.webview.WebViewCompatFeature
+import com.duckduckgo.app.browser.webview.WebViewCompatFeatureSettings
+import com.duckduckgo.browser.api.webviewcompat.WebViewCompatWrapper
+import com.duckduckgo.common.utils.DispatcherProvider
+import com.duckduckgo.di.scopes.FragmentScope
+import com.squareup.anvil.annotations.ContributesBinding
+import com.squareup.moshi.Moshi
+import dagger.SingleInstanceIn
+import kotlinx.coroutines.withContext
+import javax.inject.Inject
+
+private const val delay = "\$DELAY$"
+private const val postInitialPing = "\$POST_INITIAL_PING$"
+private const val replyToNativeMessages = "\$REPLY_TO_NATIVE_MESSAGES$"
+
+interface WebViewCompatTestHelper {
+    suspend fun configureWebViewForWebViewCompatTest(webView: DuckDuckGoWebView)
+}
+
+@ContributesBinding(FragmentScope::class)
+@SingleInstanceIn(FragmentScope::class)
+class RealWebViewCompatTestHelper @Inject constructor(
+    private val dispatchers: DispatcherProvider,
+    private val webViewCompatFeature: WebViewCompatFeature,
+    private val webViewCompatWrapper: WebViewCompatWrapper,
+    moshi: Moshi,
+) : WebViewCompatTestHelper {
+
+    private val adapter = moshi.adapter(WebViewCompatFeatureSettings::class.java)
+
+    override suspend fun configureWebViewForWebViewCompatTest(webView: DuckDuckGoWebView) {
+        val script = withContext(dispatchers.io()) {
+            if (!webViewCompatFeature.self().isEnabled()) return@withContext null
+
+            val webViewCompatSettings = webViewCompatFeature.self().getSettings()?.let {
+                adapter.fromJson(it)
+            }
+            webView.resources?.openRawResource(R.raw.webviewcompat_test_script)?.bufferedReader().use { it?.readText() }.orEmpty()
+                .replace(delay, webViewCompatSettings?.jsInitialPingDelay?.toString() ?: "0")
+                .replace(postInitialPing, webViewCompatFeature.jsSendsInitialPing().isEnabled().toString())
+                .replace(replyToNativeMessages, webViewCompatFeature.jsRepliesToNativeMessages().isEnabled().toString())
+        } ?: return
+
+        withContext(dispatchers.main()) {
+            webViewCompatWrapper.addDocumentStartJavaScript(webView, script, setOf("*"))
+        }
+    }
+}

app/src/main/java/com/duckduckgo/app/browser/webview/WebViewCompatFeature.kt

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2024 DuckDuckGo
+ *
+ * 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
+ *
+ *     http://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.duckduckgo.app.browser.webview
+
+import com.duckduckgo.anvil.annotations.ContributesRemoteFeature
+import com.duckduckgo.di.scopes.AppScope
+import com.duckduckgo.feature.toggles.api.Toggle
+import com.duckduckgo.feature.toggles.api.Toggle.DefaultFeatureValue
+
+@ContributesRemoteFeature(
+    scope = AppScope::class,
+    featureName = "webViewCompat",
+)
+interface WebViewCompatFeature {
+
+    @Toggle.DefaultValue(DefaultFeatureValue.FALSE)
+    fun self(): Toggle
+
+    @Toggle.DefaultValue(DefaultFeatureValue.FALSE)
+    fun jsSendsInitialPing(): Toggle
+
+    @Toggle.DefaultValue(DefaultFeatureValue.FALSE)
+    fun jsRepliesToNativeMessages(): Toggle
+}
+
+data class WebViewCompatFeatureSettings(
+    val jsInitialPingDelay: Long = 0,
+)