Configure script based on remote config

Author: CrisBarreiro

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

@@ -180,6 +180,8 @@ import com.duckduckgo.app.browser.webshare.WebShareChooser
 import com.duckduckgo.app.browser.webshare.WebViewCompatWebShareChooser
 import com.duckduckgo.app.browser.webview.WebContentDebugging
 import com.duckduckgo.app.browser.webview.WebViewBlobDownloadFeature
+import com.duckduckgo.app.browser.webview.WebViewCompatFeature
+import com.duckduckgo.app.browser.webview.WebViewCompatFeatureSettings
 import com.duckduckgo.app.browser.webview.safewebview.SafeWebViewFeature
 import com.duckduckgo.app.cta.ui.BrokenSitePromptDialogCta
 import com.duckduckgo.app.cta.ui.Cta
@@ -343,6 +345,8 @@ import com.google.android.material.bottomsheet.BottomSheetBehavior
 import com.google.android.material.bottomsheet.BottomSheetDialogFragment
 import com.google.android.material.snackbar.BaseTransientBottomBar
 import com.google.android.material.snackbar.Snackbar
+import com.squareup.moshi.Moshi
+import com.squareup.moshi.kotlin.reflect.KotlinJsonAdapterFactory
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.SupervisorJob
@@ -596,6 +600,9 @@ class BrowserTabFragment :
     @Inject
     lateinit var webViewCompatWrapper: WebViewCompatWrapper
 
+    @Inject
+    lateinit var webViewCompatFeature: WebViewCompatFeature
+
     /**
      * 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
@@ -3224,6 +3231,7 @@ class BrowserTabFragment :
                 onInContextEmailProtectionSignupPromptShown = { showNativeInContextEmailProtectionSignupPrompt() },
             )
             configureWebViewForBlobDownload(it)
+            configureWebViewForWebViewCompatTest(it)
             configureWebViewForAutofill(it)
             printInjector.addJsInterface(it) { viewModel.printFromWebView() }
             autoconsent.addJsInterface(it, autoconsentCallback)
@@ -3369,6 +3377,32 @@ class BrowserTabFragment :
         daxDialogIntroBubble.root.gone()
     }
 
+    private var proxy: JavaScriptReplyProxy? = null
+
+    private val delay = "\$DELAY$"
+    private val postInitialPing = "\$POST_INITIAL_PING$"
+    private val replyToNativeMessages = "\$REPLY_TO_NATIVE_MESSAGES$"
+
+    private fun configureWebViewForWebViewCompatTest(webView: DuckDuckGoWebView) {
+        lifecycleScope.launch(dispatchers.main()) {
+            val script = withContext(dispatchers.io()) {
+                if (!webViewCompatFeature.self().isEnabled()) return@withContext null
+
+                val moshi = Moshi.Builder().add(KotlinJsonAdapterFactory()).build()
+                val adapter = moshi.adapter(WebViewCompatFeatureSettings::class.java)
+                val webViewCompatSettings = webViewCompatFeature.self().getSettings()?.let {
+                    adapter.fromJson(it)
+                }
+                context?.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@launch
+
+            webViewCompatWrapper.addDocumentStartJavaScript(webView, script, setOf("*"))
+        }
+    }
+
     @SuppressLint("AddDocumentStartJavaScriptUsage")
     private fun configureWebViewForBlobDownload(webView: DuckDuckGoWebView) {
         lifecycleScope.launch(dispatchers.main()) {

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,
+)