Added callAsyncJavaScript WebView method, fix #642, fix #614

CHANGELOG.md

@@ -7,7 +7,8 @@
 - Added `IOSCookieManager` class and `CookieManager.instance().ios.getAllCookies` iOS-specific method
 - Added `UserScript`, `UserScriptInjectionTime`, `ContentWorld`, `AndroidWebViewFeature`, `AndroidServiceWorkerController`, `AndroidServiceWorkerClient` classes
 - Added `initialUserScripts` WebView option
-- Added `addUserScript`, `addUserScripts`, `removeUserScript`, `removeUserScripts`, `removeAllUserScripts` WebView methods
+- Added `addUserScript`, `addUserScripts`, `removeUserScript`, `removeUserScripts`, `removeAllUserScripts`, `callAsyncJavaScript` WebView methods
+- Added `contentWorld` argument to `evaluateJavascript` WebView method
 - Added `isDirectionalLockEnabled`, `mediaType`, `pageZoom`, `limitsNavigationsToAppBoundDomains` iOS-specific webview options
 - Added `handlesURLScheme` iOS-specific webview method
 - Updated integration tests
@@ -29,13 +30,16 @@
 - Fixed missing `clearHistory` webview method implementation on Android
 - Fixed iOS crash when using CookieManager getCookies for an URL and the host URL is `null`
 - Fixed "IOS does not support allowUniversalAccessFromFileURLs" [#654](https://github.com/pichillilorenzo/flutter_inappwebview/issues/654)
+- Fixed "Failed to load WebView provider: No WebView installed" [#642](https://github.com/pichillilorenzo/flutter_inappwebview/issues/642)
+- Fixed "java.net.MalformedURLException: unknown protocol: wss - Error using library sipml5 in flutter_inappwebview" [#614](https://github.com/pichillilorenzo/flutter_inappwebview/issues/614)
 
 ### BREAKING CHANGES
 
 - Minimum Flutter version required is `1.22.0` and Dart SDK `>=2.12.0-0 <3.0.0`
 - iOS Xcode version `>= 12`
 - Removed `debuggingEnabled` WebView option; on Android you should use now the `AndroidInAppWebViewController.setWebContentsDebuggingEnabled(bool debuggingEnabled)` static method; on iOS, debugging is always enabled
-- `allowUniversalAccessFromFileURLs` and `allowFileAccessFromFileURLs` WebView options moved from Android-specific options to cross-platform options.
+- `allowUniversalAccessFromFileURLs` and `allowFileAccessFromFileURLs` WebView options moved from Android-specific options to cross-platform options
+- Added `callAsyncJavaScript` name to the list of javaScriptHandlerForbiddenNames
 
 ## 4.0.0+4
 

android/src/main/java/com/pichillilorenzo/flutter_inappwebview/InAppWebView/InAppWebView.java

@@ -16,6 +16,7 @@ import android.os.Message;
 import android.print.PrintAttributes;
 import android.print.PrintDocumentAdapter;
 import android.print.PrintManager;
+import android.text.TextUtils;
 import android.util.AttributeSet;
 import android.util.Log;
 import android.view.ActionMode;
@@ -42,6 +43,7 @@ import android.widget.HorizontalScrollView;
 import android.widget.LinearLayout;
 import android.widget.TextView;
 
+import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.RequiresApi;
 import androidx.webkit.WebViewCompat;
@@ -67,9 +69,11 @@ import java.security.cert.X509Certificate;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.HashSet;
+import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.UUID;
 import java.util.regex.Pattern;
 
 import io.flutter.plugin.common.MethodChannel;
@@ -116,6 +120,8 @@ final public class InAppWebView extends InputAwareWebView {
     add("page");
   }};
 
+  public Map<String, MethodChannel.Result> callAsyncJavaScriptResults = new HashMap<>();
+
   static final String pluginScriptsWrapperJS = "(function(){" +
           "  if (window." + JavaScriptBridgeInterface.name + " == null || window." + JavaScriptBridgeInterface.name + "._pluginScriptsLoaded == null || !window." + JavaScriptBridgeInterface.name + "._pluginScriptsLoaded) {" +
           "    $PLACEHOLDER_VALUE" +
@@ -659,11 +665,22 @@ final public class InAppWebView extends InputAwareWebView {
           "  });" +
           "})();";
 
-    static final String onWindowBlurEventJS = "(function(){" +
+  static final String onWindowBlurEventJS = "(function(){" +
-          "  window.addEventListener('blur', function(e) {" +
+        "  window.addEventListener('blur', function(e) {" +
-          "    window." + JavaScriptBridgeInterface.name + ".callHandler('onWindowBlur');" +
+        "    window." + JavaScriptBridgeInterface.name + ".callHandler('onWindowBlur');" +
-          "  });" +
+        "  });" +
-          "})();";
+        "})();";
+
+  static final String callAsyncJavaScriptWrapperJS = "(function(obj) {" +
+        "  (async function($FUNCTION_ARGUMENT_NAMES) {" +
+        "    $FUNCTION_BODY" +
+        "  })($FUNCTION_ARGUMENT_VALUES).then(function(value) {" +
+        "    window." + JavaScriptBridgeInterface.name + ".callHandler('callAsyncJavaScript', {'value': value, 'error': null, 'resultUuid': '$RESULT_UUID'});" +
+        "  }).catch(function(error) {" +
+        "    window." + JavaScriptBridgeInterface.name + ".callHandler('callAsyncJavaScript', {'value': null, 'error': error, 'resultUuid': '$RESULT_UUID'});" +
+        "  });" +
+        "  return null;" +
+        "})($FUNCTION_ARGUMENTS_OBJ);";
 
   public InAppWebView(Context context) {
     super(context);
@@ -1521,7 +1538,7 @@ final public class InAppWebView extends InputAwareWebView {
     });
   }
 
-  public void evaluateJavascript(String source, String contentWorldName, MethodChannel.Result result) {
+  public void evaluateJavascript(String source, @Nullable String contentWorldName, MethodChannel.Result result) {
     injectDeferredObject(source, contentWorldName, null, result);
   }
 
@@ -2093,6 +2110,47 @@ final public class InAppWebView extends InputAwareWebView {
     return sourceWrapped;
   }
 
+  @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
+  public void callAsyncJavaScript(String functionBody, Map<String, Object> arguments, @Nullable String contentWorldName, @NonNull MethodChannel.Result result) {
+    String resultUuid = UUID.randomUUID().toString();
+    callAsyncJavaScriptResults.put(resultUuid, result);
+
+    JSONObject functionArguments = new JSONObject(arguments);
+    Iterator<String> keys = functionArguments.keys();
+
+    List<String> functionArgumentNamesList = new ArrayList<>();
+    List<String> functionArgumentValuesList = new ArrayList<>();
+    while (keys.hasNext()) {
+      String key = keys.next();
+      functionArgumentNamesList.add(key);
+      functionArgumentValuesList.add("obj." + key);
+    }
+
+    String functionArgumentNames = TextUtils.join(", ", functionArgumentNamesList);
+    String functionArgumentValues = TextUtils.join(", ", functionArgumentValuesList);
+    String functionArgumentsObj = Util.JSONStringify(arguments);
+
+    String sourceToInject = InAppWebView.callAsyncJavaScriptWrapperJS
+            .replace("$FUNCTION_ARGUMENT_NAMES", functionArgumentNames)
+            .replace("$FUNCTION_ARGUMENT_VALUES", functionArgumentValues)
+            .replace("$FUNCTION_ARGUMENTS_OBJ", functionArgumentsObj)
+            .replace("$FUNCTION_BODY", functionBody)
+            .replace("$RESULT_UUID", resultUuid);
+
+    if (contentWorldName != null && !contentWorldName.equals("page")) {
+      if (!userScriptsContentWorlds.contains(contentWorldName)) {
+        userScriptsContentWorlds.add(contentWorldName);
+        // Add only the first time all the plugin scripts needed.
+        String jsPluginScripts = prepareAndWrapPluginUserScripts();
+        sourceToInject = jsPluginScripts + "\n" + sourceToInject;
+      }
+      sourceToInject = wrapSourceCodeInContentWorld(contentWorldName, sourceToInject);
+
+    }
+
+    evaluateJavascript(sourceToInject,  null);
+  }
+
   @Override
   public void dispose() {
     if (windowId != null && InAppWebViewChromeClient.windowWebViewMessages.containsKey(windowId)) {
@@ -2106,6 +2164,7 @@ final public class InAppWebView extends InputAwareWebView {
       removeCallbacks(checkContextMenuShouldBeClosedTask);
     if (checkScrollStoppedTask != null)
       removeCallbacks(checkScrollStoppedTask);
+    callAsyncJavaScriptResults.clear();
     super.dispose();
   }
 

android/src/main/java/com/pichillilorenzo/flutter_inappwebview/InAppWebView/InAppWebViewClient.java

@@ -29,7 +29,6 @@ import com.pichillilorenzo.flutter_inappwebview.InAppBrowser.InAppBrowserActivit
 import com.pichillilorenzo.flutter_inappwebview.Util;
 
 import java.io.ByteArrayInputStream;
-import java.net.MalformedURLException;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.net.URL;
@@ -341,10 +340,10 @@ public class InAppWebViewClient extends WebViewClient {
   @Override
   public void onReceivedHttpAuthRequest(final WebView view, final HttpAuthHandler handler, final String host, final String realm) {
 
-    URL url;
+    URI uri;
     try {
-      url = new URL(view.getUrl());
+      uri = new URI(view.getUrl());
-    } catch (MalformedURLException e) {
+    } catch (URISyntaxException e) {
       e.printStackTrace();
 
       credentialsProposed = null;
@@ -354,8 +353,8 @@ public class InAppWebViewClient extends WebViewClient {
       return;
     }
 
-    final String protocol = url.getProtocol();
+    final String protocol = uri.getScheme();
-    final int port = url.getPort();
+    final int port = uri.getPort();
 
     previousAuthRequestFailureCount++;
 
@@ -422,19 +421,19 @@ public class InAppWebViewClient extends WebViewClient {
 
   @Override
   public void onReceivedSslError(final WebView view, final SslErrorHandler handler, final SslError error) {
-    URL url;
+    URI uri;
     try {
-      url = new URL(error.getUrl());
+      uri = new URI(view.getUrl());
-    } catch (MalformedURLException e) {
+    } catch (URISyntaxException e) {
       e.printStackTrace();
       handler.cancel();
       return;
     }
 
-    final String host = url.getHost();
+    final String host = uri.getHost();
-    final String protocol = url.getProtocol();
+    final String protocol = uri.getScheme();
     final String realm = null;
-    final int port = url.getPort();
+    final int port = uri.getPort();
 
     Map<String, Object> obj = new HashMap<>();
     obj.put("host", host);
@@ -507,16 +506,16 @@ public class InAppWebViewClient extends WebViewClient {
   @Override
   public void onReceivedClientCertRequest(final WebView view, final ClientCertRequest request) {
 
-    URL url;
+    URI uri;
     try {
-      url = new URL(view.getUrl());
+      uri = new URI(view.getUrl());
-    } catch (MalformedURLException e) {
+    } catch (URISyntaxException e) {
       e.printStackTrace();
       request.cancel();
       return;
     }
 
-    final String protocol = url.getProtocol();
+    final String protocol = uri.getScheme();
     final String realm = null;
 
     Map<String, Object> obj = new HashMap<>();

android/src/main/java/com/pichillilorenzo/flutter_inappwebview/InAppWebViewMethodHandler.java

@@ -438,6 +438,17 @@ public class InAppWebViewMethodHandler implements MethodChannel.MethodCallHandle
         }
         result.success(true);
         break;
+      case "callAsyncJavaScript":
+        if (webView != null && Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+          String functionBody = (String) call.argument("functionBody");
+          Map<String, Object> functionArguments = (Map<String, Object>) call.argument("arguments");
+          String contentWorldName = (String) call.argument("contentWorld");
+          webView.callAsyncJavaScript(functionBody, functionArguments, contentWorldName, result);
+        }
+        else {
+          result.success(null);
+        }
+        break;
       default:
         result.notImplemented();
     }

android/src/main/java/com/pichillilorenzo/flutter_inappwebview/JavaScriptBridgeInterface.java

@@ -11,6 +11,10 @@ import com.pichillilorenzo.flutter_inappwebview.InAppBrowser.InAppBrowserActivit
 import com.pichillilorenzo.flutter_inappwebview.InAppWebView.FlutterWebView;
 import com.pichillilorenzo.flutter_inappwebview.InAppWebView.InAppWebView;
 
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
 import java.util.HashMap;
 import java.util.Map;
 
@@ -96,6 +100,21 @@ public class JavaScriptBridgeInterface {
 
         if (handlerName.equals("onPrint") && Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
           webView.printCurrentPage();
+        } else if (handlerName.equals("callAsyncJavaScript")) {
+          try {
+            JSONArray arguments = new JSONArray(args);
+            JSONObject jsonObject = arguments.getJSONObject(0);
+            String resultUuid = jsonObject.getString("resultUuid");
+            if (webView.callAsyncJavaScriptResults.containsKey(resultUuid)) {
+              MethodChannel.Result callAsyncJavaScriptResult = webView.callAsyncJavaScriptResults.get(resultUuid);
+              callAsyncJavaScriptResult.success(jsonObject.toString());
+
+              webView.callAsyncJavaScriptResults.remove(resultUuid);
+            }
+          } catch (JSONException e) {
+            e.printStackTrace();
+          }
+          return;
         }
 
         channel.invokeMethod("onCallJsHandler", obj, new MethodChannel.Result() {

android/src/main/java/com/pichillilorenzo/flutter_inappwebview/MyCookieManager.java

@@ -1,11 +1,19 @@
 package com.pichillilorenzo.flutter_inappwebview;
 
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.os.AsyncTask;
 import android.os.Build;
+import android.os.Handler;
+import android.os.Looper;
+import android.os.Message;
 import android.util.Log;
 import android.webkit.CookieManager;
 import android.webkit.CookieSyncManager;
 import android.webkit.ValueCallback;
 
+import androidx.annotation.Nullable;
+
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.text.SimpleDateFormat;
@@ -16,6 +24,7 @@ import java.util.List;
 import java.util.Locale;
 import java.util.Map;
 import java.util.TimeZone;
+import java.util.concurrent.Executors;
 
 import io.flutter.plugin.common.BinaryMessenger;
 import io.flutter.plugin.common.MethodCall;
@@ -29,10 +38,13 @@ public class MyCookieManager implements MethodChannel.MethodCallHandler {
   public static MethodChannel channel;
   public static CookieManager cookieManager;
 
+  // As CookieManager was synchronous before API 21 this class emulates the async behavior on <21.
+  private static final boolean USES_LEGACY_STORE = Build.VERSION.SDK_INT < 21;
+
   public MyCookieManager(BinaryMessenger messenger) {
     channel = new MethodChannel(messenger, "com.pichillilorenzo/flutter_inappwebview_cookiemanager");
     channel.setMethodCallHandler(this);
-    cookieManager = CookieManager.getInstance();
+    cookieManager = getCookieManager();
   }
 
   @Override
@@ -92,6 +104,40 @@ public class MyCookieManager implements MethodChannel.MethodCallHandler {
     }
   }
 
+  /**
+   * Instantiating CookieManager will load the Chromium task taking a 100ish ms so we do it lazily
+   * to make sure it's done on a background thread as needed.
+   *
+   * https://github.com/facebook/react-native/blob/1903f6680d9750e244d97c3cd4a9f755a9a47c61/ReactAndroid/src/main/java/com/facebook/react/modules/network/ForwardingCookieHandler.java#L132
+   */
+  static private @Nullable CookieManager getCookieManager() {
+    if (cookieManager == null) {
+      try {
+        cookieManager = CookieManager.getInstance();
+      } catch (IllegalArgumentException ex) {
+        // https://bugs.chromium.org/p/chromium/issues/detail?id=559720
+        return null;
+      } catch (Exception exception) {
+        String message = exception.getMessage();
+        // We cannot catch MissingWebViewPackageException as it is in a private / system API
+        // class. This validates the exception's message to ensure we are only handling this
+        // specific exception.
+        // https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/webkit/WebViewFactory.java#348
+        if (message != null
+                && exception
+                .getClass()
+                .getCanonicalName()
+                .equals("android.webkit.WebViewFactory.MissingWebViewPackageException")) {
+          return null;
+        } else {
+          throw exception;
+        }
+      }
+    }
+
+    return cookieManager;
+  }
+
   public static void setCookie(String url,
                                String name,
                                String value,
@@ -103,6 +149,8 @@ public class MyCookieManager implements MethodChannel.MethodCallHandler {
                                Boolean isHttpOnly,
                                String sameSite,
                                final MethodChannel.Result result) {
+    cookieManager = getCookieManager();
+    if (cookieManager == null) return;
 
     String cookieValue = name + "=" + value + "; Domain=" + domain + "; Path=" + path;
 
@@ -146,6 +194,9 @@ public class MyCookieManager implements MethodChannel.MethodCallHandler {
 
     final List<Map<String, Object>> cookieListMap = new ArrayList<>();
 
+    cookieManager = getCookieManager();
+    if (cookieManager == null) return cookieListMap;
+
     String cookiesString = cookieManager.getCookie(url);
 
     if (cookiesString != null) {
@@ -173,6 +224,8 @@ public class MyCookieManager implements MethodChannel.MethodCallHandler {
   }
 
   public static void deleteCookie(String url, String name, String domain, String path, final MethodChannel.Result result) {
+    cookieManager = getCookieManager();
+    if (cookieManager == null) return;
 
     String cookieValue = name + "=; Path=" + path + "; Domain=" + domain + "; Max-Age=-1;";
 
@@ -196,6 +249,8 @@ public class MyCookieManager implements MethodChannel.MethodCallHandler {
   }
 
   public static void deleteCookies(String url, String domain, String path, final MethodChannel.Result result) {
+    cookieManager = getCookieManager();
+    if (cookieManager == null) return;
 
     CookieSyncManager cookieSyncMngr = null;
 
@@ -228,6 +283,8 @@ public class MyCookieManager implements MethodChannel.MethodCallHandler {
   }
 
   public static void deleteAllCookies(final MethodChannel.Result result) {
+    cookieManager = getCookieManager();
+    if (cookieManager == null) return;
 
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
       cookieManager.removeAllCookies(new ValueCallback<Boolean>() {

android/src/main/java/com/pichillilorenzo/flutter_inappwebview/Util.java

@@ -2,6 +2,7 @@ package com.pichillilorenzo.flutter_inappwebview;
 
 import android.content.res.AssetManager;
 import android.net.http.SslCertificate;
+import android.os.Build;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.IBinder;
@@ -9,6 +10,12 @@ import android.os.Looper;
 import android.os.Parcelable;
 import android.util.Log;
 
+import androidx.annotation.RequiresApi;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.io.InputStream;
@@ -22,6 +29,7 @@ import java.security.cert.CertificateFactory;
 import java.security.cert.X509Certificate;
 import java.util.Enumeration;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
@@ -234,4 +242,20 @@ public class Util {
 
     return x509Certificate;
   }
+
+  @RequiresApi(api = Build.VERSION_CODES.KITKAT)
+  public static String JSONStringify(Object value) {
+    if (value == null) {
+      return "null";
+    }
+    if (value instanceof Map) {
+      return new JSONObject((Map<String, Object>) value).toString();
+    } else if (value instanceof List) {
+      return new JSONArray((List<Object>) value).toString();
+    } else if (value instanceof String) {
+      return JSONObject.quote((String) value);
+    } else {
+      return JSONObject.wrap(value).toString();
+    }
+  }
 }

example/.flutter-plugins-dependencies

@@ -1 +1 @@
-{"info":"This is a generated file; do not edit or check into version control.","plugins":{"ios":[{"name":"device_info","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/device_info-2.0.0-nullsafety.2/","dependencies":[]},{"name":"flutter_downloader","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_downloader-1.5.2/","dependencies":[]},{"name":"flutter_inappwebview","path":"/Users/lorenzopichilli/Desktop/flutter_inappwebview/","dependencies":["device_info"]},{"name":"integration_test","path":"/Users/lorenzopichilli/flutter/.pub-cache/git/plugins-16f3281b04b0db12e609352b1c9544901392e428/packages/integration_test/","dependencies":[]},{"name":"path_provider","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/path_provider-1.6.27/","dependencies":[]},{"name":"permission_handler","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/permission_handler-5.0.1+1/","dependencies":[]},{"name":"url_launcher","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher-6.0.0-nullsafety.4/","dependencies":[]}],"android":[{"name":"device_info","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/device_info-2.0.0-nullsafety.2/","dependencies":[]},{"name":"flutter_downloader","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_downloader-1.5.2/","dependencies":[]},{"name":"flutter_inappwebview","path":"/Users/lorenzopichilli/Desktop/flutter_inappwebview/","dependencies":["device_info"]},{"name":"integration_test","path":"/Users/lorenzopichilli/flutter/.pub-cache/git/plugins-16f3281b04b0db12e609352b1c9544901392e428/packages/integration_test/","dependencies":[]},{"name":"path_provider","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/path_provider-1.6.27/","dependencies":[]},{"name":"permission_handler","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/permission_handler-5.0.1+1/","dependencies":[]},{"name":"url_launcher","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher-6.0.0-nullsafety.4/","dependencies":[]}],"macos":[{"name":"path_provider_macos","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/path_provider_macos-0.0.4+8/","dependencies":[]},{"name":"url_launcher_macos","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher_macos-0.1.0-nullsafety.2/","dependencies":[]}],"linux":[{"name":"path_provider_linux","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/path_provider_linux-0.0.1+2/","dependencies":[]},{"name":"url_launcher_linux","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher_linux-0.1.0-nullsafety.3/","dependencies":[]}],"windows":[{"name":"path_provider_windows","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/path_provider_windows-0.0.4+3/","dependencies":[]},{"name":"url_launcher_windows","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher_windows-0.1.0-nullsafety.2/","dependencies":[]}],"web":[]},"dependencyGraph":[{"name":"device_info","dependencies":[]},{"name":"flutter_downloader","dependencies":[]},{"name":"flutter_inappwebview","dependencies":["device_info"]},{"name":"integration_test","dependencies":[]},{"name":"path_provider","dependencies":["path_provider_macos","path_provider_linux","path_provider_windows"]},{"name":"path_provider_linux","dependencies":[]},{"name":"path_provider_macos","dependencies":[]},{"name":"path_provider_windows","dependencies":[]},{"name":"permission_handler","dependencies":[]},{"name":"url_launcher","dependencies":["url_launcher_linux","url_launcher_macos","url_launcher_windows"]},{"name":"url_launcher_linux","dependencies":[]},{"name":"url_launcher_macos","dependencies":[]},{"name":"url_launcher_windows","dependencies":[]}],"date_created":"2021-02-06 02:03:14.260971","version":"1.26.0-18.0.pre.90"}
+{"info":"This is a generated file; do not edit or check into version control.","plugins":{"ios":[{"name":"device_info","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/device_info-2.0.0-nullsafety.2/","dependencies":[]},{"name":"flutter_downloader","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_downloader-1.5.2/","dependencies":[]},{"name":"flutter_inappwebview","path":"/Users/lorenzopichilli/Desktop/flutter_inappwebview/","dependencies":["device_info"]},{"name":"integration_test","path":"/Users/lorenzopichilli/flutter/.pub-cache/git/plugins-16f3281b04b0db12e609352b1c9544901392e428/packages/integration_test/","dependencies":[]},{"name":"path_provider","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/path_provider-1.6.27/","dependencies":[]},{"name":"permission_handler","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/permission_handler-5.0.1+1/","dependencies":[]},{"name":"url_launcher","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher-6.0.0-nullsafety.4/","dependencies":[]}],"android":[{"name":"device_info","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/device_info-2.0.0-nullsafety.2/","dependencies":[]},{"name":"flutter_downloader","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_downloader-1.5.2/","dependencies":[]},{"name":"flutter_inappwebview","path":"/Users/lorenzopichilli/Desktop/flutter_inappwebview/","dependencies":["device_info"]},{"name":"integration_test","path":"/Users/lorenzopichilli/flutter/.pub-cache/git/plugins-16f3281b04b0db12e609352b1c9544901392e428/packages/integration_test/","dependencies":[]},{"name":"path_provider","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/path_provider-1.6.27/","dependencies":[]},{"name":"permission_handler","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/permission_handler-5.0.1+1/","dependencies":[]},{"name":"url_launcher","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher-6.0.0-nullsafety.4/","dependencies":[]}],"macos":[{"name":"path_provider_macos","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/path_provider_macos-0.0.4+8/","dependencies":[]},{"name":"url_launcher_macos","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher_macos-0.1.0-nullsafety.2/","dependencies":[]}],"linux":[{"name":"path_provider_linux","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/path_provider_linux-0.0.1+2/","dependencies":[]},{"name":"url_launcher_linux","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher_linux-0.1.0-nullsafety.3/","dependencies":[]}],"windows":[{"name":"path_provider_windows","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/path_provider_windows-0.0.4+3/","dependencies":[]},{"name":"url_launcher_windows","path":"/Users/lorenzopichilli/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher_windows-0.1.0-nullsafety.2/","dependencies":[]}],"web":[]},"dependencyGraph":[{"name":"device_info","dependencies":[]},{"name":"flutter_downloader","dependencies":[]},{"name":"flutter_inappwebview","dependencies":["device_info"]},{"name":"integration_test","dependencies":[]},{"name":"path_provider","dependencies":["path_provider_macos","path_provider_linux","path_provider_windows"]},{"name":"path_provider_linux","dependencies":[]},{"name":"path_provider_macos","dependencies":[]},{"name":"path_provider_windows","dependencies":[]},{"name":"permission_handler","dependencies":[]},{"name":"url_launcher","dependencies":["url_launcher_linux","url_launcher_macos","url_launcher_windows"]},{"name":"url_launcher_linux","dependencies":[]},{"name":"url_launcher_macos","dependencies":[]},{"name":"url_launcher_windows","dependencies":[]}],"date_created":"2021-02-07 16:00:15.712688","version":"1.26.0-18.0.pre.90"}

example/ios/Runner.xcodeproj/project.pbxproj

@@ -18,10 +18,22 @@
 		EDC1147F21735BC200D2247A /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FA1CF9000F007C117D /* Main.storyboard */; };
 /* End PBXBuildFile section */
 
+/* Begin PBXCopyFilesBuildPhase section */
+		6174FE1725CEB74E00A5020C /* Embed App Extensions */ = {
+			isa = PBXCopyFilesBuildPhase;
+			buildActionMask = 2147483647;
+			dstPath = "";
+			dstSubfolderSpec = 13;
+			files = (
+			);
+			name = "Embed App Extensions";
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXCopyFilesBuildPhase section */
+
 /* Begin PBXFileReference section */
 		1498D2321E8E86230040F4C2 /* GeneratedPluginRegistrant.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = GeneratedPluginRegistrant.h; sourceTree = "<group>"; };
 		1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GeneratedPluginRegistrant.m; sourceTree = "<group>"; };
-		26ADC1E5EAF404A509D528C5 /* Pods_Runner_copy.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = Pods_Runner_copy.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; name = AppFrameworkInfo.plist; path = Flutter/AppFrameworkInfo.plist; sourceTree = "<group>"; };
 		61FF72FF23634CA10069C557 /* libsqlite3.tbd */ = {isa = PBXFileReference; lastKnownFileType = "sourcecode.text-based-dylib-definition"; name = libsqlite3.tbd; path = usr/lib/libsqlite3.tbd; sourceTree = SDKROOT; };
 		61FF730123634DD10069C557 /* flutter_downloader.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = flutter_downloader.framework; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -59,7 +71,6 @@
 			children = (
 				61FF730123634DD10069C557 /* flutter_downloader.framework */,
 				61FF72FF23634CA10069C557 /* libsqlite3.tbd */,
-				26ADC1E5EAF404A509D528C5 /* Pods_Runner_copy.framework */,
 				B0FC2CF7A6002799890B3102 /* Pods_Runner.framework */,
 			);
 			name = Frameworks;
@@ -141,6 +152,7 @@
 				97C146EC1CF9000F007C117D /* Resources */,
 				3B06AD1E1E4923F5004D2608 /* Thin Binary */,
 				903A9F2558754FA70D0A7EA8 /* [CP] Embed Pods Frameworks */,
+				6174FE1725CEB74E00A5020C /* Embed App Extensions */,
 			);
 			buildRules = (
 			);
@@ -157,6 +169,7 @@
 		97C146E61CF9000F007C117D /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
+				LastSwiftUpdateCheck = 1240;
 				LastUpgradeCheck = 1110;
 				ORGANIZATIONNAME = "The Chromium Authors";
 				TargetAttributes = {

example/ios/Runner/Info.plist

@@ -59,7 +59,7 @@
 	</array>
 	<key>NSBonjourServices</key>
 	<array>
-		<string></string>
+		<string>_dartobservatory._tcp</string>
 	</array>
 	<key>UIViewControllerBasedStatusBarAppearance</key>
 	<false/>

ios/Classes/InAppWebView.swift

@@ -827,6 +827,19 @@ let onWindowBlurEventJS = """
 })();
 """
 
+let callAsyncJavaScriptBelowIOS14WrapperJS = """
+(function(obj) {
+    (async function($FUNCTION_ARGUMENT_NAMES) {
+        $FUNCTION_BODY
+    })($FUNCTION_ARGUMENT_VALUES).then(function(value) {
+        window.webkit.messageHandlers['onCallAsyncJavaScriptResultBelowIOS14Received'].postMessage({'value': value, 'error': null, 'resultUuid': '$RESULT_UUID'});
+    }).catch(function(error) {
+        window.webkit.messageHandlers['onCallAsyncJavaScriptResultBelowIOS14Received'].postMessage({'value': null, 'error': error, 'resultUuid': '$RESULT_UUID'});
+    });
+    return null;
+})($FUNCTION_ARGUMENTS_OBJ);
+"""
+
 var SharedLastTouchPointTimestamp: [InAppWebView: Int64] = [:]
 
 public class WebViewTransport: NSObject {
@@ -879,6 +892,8 @@ public class InAppWebView: WKWebView, UIScrollViewDelegate, WKUIDelegate, WKNavi
     
     var userScriptsContentWorlds: [String] = ["page"]
     
+    var callAsyncJavaScriptBelowIOS14Results: [String:FlutterResult] = [:]
+    
     init(frame: CGRect, configuration: WKWebViewConfiguration, IABController: InAppBrowserWebViewController?, contextMenu: [String: Any]?, channel: FlutterMethodChannel?) {
         super.init(frame: frame, configuration: configuration)
         self.channel = channel
@@ -1333,6 +1348,9 @@ public class InAppWebView: WKWebView, UIScrollViewDelegate, WKUIDelegate, WKNavi
             
             let printJSScript = WKUserScript(source: printJS, injectionTime: .atDocumentStart, forMainFrameOnly: false)
             configuration.userContentController.addUserScript(printJSScript)
+            
+            configuration.userContentController.removeScriptMessageHandler(forName: "onCallAsyncJavaScriptResultBelowIOS14Received")
+            configuration.userContentController.add(self, name: "onCallAsyncJavaScriptResultBelowIOS14Received")
         }
     }
     
@@ -2113,10 +2131,79 @@ public class InAppWebView: WKWebView, UIScrollViewDelegate, WKUIDelegate, WKNavi
         }
     }
     
-    public func evaluateJavascript(source: String, contentWorldName: String?, result: FlutterResult?) {
+    public func evaluateJavascript(source: String, contentWorldName: String?, result: @escaping FlutterResult) {
         injectDeferredObject(source: source, contentWorldName: contentWorldName, withWrapper: nil, result: result)
     }
     
+    @available(iOS 10.3, *)
+    public func callAsyncJavaScript(functionBody: String, arguments: [String:Any], contentWorldName: String?, result: @escaping FlutterResult) {
+        var jsToInject = functionBody
+        if #available(iOS 14.0, *) {
+            var contentWorld = WKContentWorld.page
+            if let contentWorldName = contentWorldName {
+                contentWorld = getContentWorld(name: contentWorldName)
+                if !userScriptsContentWorlds.contains(contentWorldName) {
+                    userScriptsContentWorlds.append(contentWorldName)
+                    addSharedPluginUserScriptsInContentWorld(contentWorldName: contentWorldName)
+                    // Add only the first time all the plugin user scripts needed.
+                    // In the next page load, it will use the WKUserScripts loaded
+                    jsToInject = getAllPluginUserScriptMergedJS() + "\n" + jsToInject
+                }
+            }
+            callAsyncJavaScript(jsToInject, arguments: arguments, in: nil, in: contentWorld) { (evalResult) in
+                var body: [String: Any?] = [
+                    "value": nil,
+                    "error": nil
+                ]
+                
+                switch (evalResult) {
+                case .success(let value):
+                    body["value"] = value
+                    break
+                case .failure(let error):
+                    body["error"] = error
+                    break
+                }
+                
+                result(body)
+            }
+        } else {
+            let resultUuid = NSUUID().uuidString
+            callAsyncJavaScriptBelowIOS14Results[resultUuid] = result
+            
+            var functionArgumentNamesList: [String] = []
+            var functionArgumentValuesList: [String] = []
+            let keys = arguments.keys
+            keys.forEach { (key) in
+                functionArgumentNamesList.append(key)
+                functionArgumentValuesList.append("obj.\(key)")
+            }
+            
+            let functionArgumentNames = functionArgumentNamesList.joined(separator: ", ")
+            let functionArgumentValues = functionArgumentValuesList.joined(separator: ", ")
+            
+            jsToInject = callAsyncJavaScriptBelowIOS14WrapperJS
+                .replacingOccurrences(of: "$FUNCTION_ARGUMENT_NAMES", with: functionArgumentNames)
+                .replacingOccurrences(of: "$FUNCTION_ARGUMENT_VALUES", with: functionArgumentValues)
+                .replacingOccurrences(of: "$FUNCTION_ARGUMENTS_OBJ", with: JSONStringify(value: arguments))
+                .replacingOccurrences(of: "$FUNCTION_BODY", with: jsToInject)
+                .replacingOccurrences(of: "$RESULT_UUID", with: resultUuid)
+            
+            evaluateJavaScript(jsToInject) { (value, error) in
+                if error != nil {
+                    let userInfo = (error! as NSError).userInfo
+                    self.onConsoleMessage(message:
+                                            userInfo["WKJavaScriptExceptionMessage"] as? String ??
+                                            userInfo["NSLocalizedDescription"] as? String ??
+                                            "",
+                                          messageLevel: 3)
+                    result(nil)
+                    self.callAsyncJavaScriptBelowIOS14Results.removeValue(forKey: resultUuid)
+                }
+            }
+        }
+    }
+    
     public func injectJavascriptFileFromUrl(urlFile: String) {
         let jsWrapper = "(function(d) { var c = d.createElement('script'); c.src = %@; d.body.appendChild(c); })(document);"
         injectDeferredObject(source: urlFile, contentWorldName: nil, withWrapper: jsWrapper, result: nil)
@@ -3270,6 +3357,16 @@ if(window.\(JAVASCRIPT_BRIDGE_NAME)[\(_callHandlerID)] != null) {
                 webView = webViewTransport.webView
             }
             webView.onFindResultReceived(activeMatchOrdinal: activeMatchOrdinal, numberOfMatches: numberOfMatches, isDoneCounting: isDoneCounting)
+        } else if message.name == "onCallAsyncJavaScriptResultBelowIOS14Received" {
+            let body = message.body as! [String: Any?]
+            let resultUuid = body["resultUuid"] as! String
+            if let result = callAsyncJavaScriptBelowIOS14Results[resultUuid] {
+                result([
+                        "value": body["value"],
+                        "error": body["error"]
+                ])
+                callAsyncJavaScriptBelowIOS14Results.removeValue(forKey: resultUuid)
+            }
         }
     }
     
@@ -3436,6 +3533,7 @@ if(window.\(JAVASCRIPT_BRIDGE_NAME)[\(_callHandlerID)] != null) {
             configuration.userContentController.removeScriptMessageHandler(forName: "consoleWarn")
             configuration.userContentController.removeScriptMessageHandler(forName: "callHandler")
             configuration.userContentController.removeScriptMessageHandler(forName: "onFindResultReceived")
+            configuration.userContentController.removeScriptMessageHandler(forName: "onCallAsyncJavaScriptResultBelowIOS14Received")
             if #available(iOS 14.0, *) {
                 configuration.userContentController.removeAllScriptMessageHandlers()
                 for contentWorldName in userScriptsContentWorlds {
@@ -3469,6 +3567,7 @@ if(window.\(JAVASCRIPT_BRIDGE_NAME)[\(_callHandlerID)] != null) {
         if let wId = windowId, InAppWebView.windowWebViews[wId] != nil {
             InAppWebView.windowWebViews.removeValue(forKey: wId)
         }
+        callAsyncJavaScriptBelowIOS14Results.removeAll()
         super.removeFromSuperview()
     }
     

ios/Classes/InAppWebViewMethodHandler.swift

@@ -384,6 +384,17 @@ class InAppWebViewMethodHandler: FlutterMethodCallDelegate {
                 webView?.removeAllUserScripts()
                 result(true)
                 break
+            case "callAsyncJavaScript":
+                if webView != nil, #available(iOS 10.3, *) {
+                    let functionBody = arguments!["functionBody"] as! String
+                    let functionArguments = arguments!["arguments"] as! [String:Any]
+                    let contentWorldName = arguments!["contentWorld"] as? String
+                    webView!.callAsyncJavaScript(functionBody: functionBody, arguments: functionArguments, contentWorldName: contentWorldName, result: result)
+                }
+                else {
+                    result(nil)
+                }
+                break
             default:
                 result(FlutterMethodNotImplemented)
                 break

lib/src/in_app_webview_controller.dart

@@ -32,6 +32,7 @@ const javaScriptHandlerForbiddenNames = [
   "onPrint",
   "onWindowFocus",
   "onWindowBlur",
+  "callAsyncJavaScript"
 ];
 
 ///Controls a WebView, such as an [InAppWebView] widget instance, a [HeadlessInAppWebView] instance or [InAppBrowser] WebView instance.
@@ -2039,6 +2040,46 @@ class InAppWebViewController {
     await _channel.invokeMethod('removeAllUserScripts', args);
   }
 
+  ///Executes the specified string as an asynchronous JavaScript function.
+  ///
+  ///[functionBody] is the JavaScript string to use as the function body.
+  ///This method treats the string as an anonymous JavaScript function body and calls it with the named arguments in the arguments parameter.
+  ///
+  ///[arguments] is a dictionary of the arguments to pass to the function call.
+  ///Each key in the dictionary corresponds to the name of an argument in the [functionBody] string,
+  ///and the value of that key is the value to use during the evaluation of the code.
+  ///Supported value types can be found in the official Flutter docs:
+  ///[Platform channel data types support and codecs](https://flutter.dev/docs/development/platform-integration/platform-channels#codec),
+  ///except for [Uint8List], [Int32List], [Int64List], and [Float64List] that should be converted into a [List].
+  ///All items in an array or dictionary must also be one of the supported types.
+  ///
+  ///[contentWorld], on iOS, it represents the namespace in which to evaluate the JavaScript [source] code.
+  ///Instead, on Android, it will run the [source] code into an iframe.
+  ///This parameter doesn’t apply to changes you make to the underlying web content, such as the document’s DOM structure.
+  ///Those changes remain visible to all scripts, regardless of which content world you specify.
+  ///For more information about content worlds, see [ContentWorld].
+  ///Available on iOS 14.0+.
+  ///
+  ///**NOTE for iOS**: available only on iOS 10.3+.
+  ///
+  ///**NOTE for Android**: available only on Android 21+.
+  ///
+  ///**Official iOS API**: https://developer.apple.com/documentation/webkit/wkwebview/3656441-callasyncjavascript
+  Future<CallAsyncJavaScriptResult?> callAsyncJavaScript({required String functionBody, Map<String, dynamic> arguments = const <String, dynamic>{}, ContentWorld? contentWorld}) async {
+    Map<String, dynamic> args = <String, dynamic>{};
+    args.putIfAbsent('functionBody', () => functionBody);
+    args.putIfAbsent('arguments', () => arguments);
+    args.putIfAbsent('contentWorld', () => contentWorld?.name);
+    var data = await _channel.invokeMethod('callAsyncJavaScript', args);
+    if (data == null) {
+      return null;
+    }
+    if (defaultTargetPlatform == TargetPlatform.android) {
+      data = json.decode(data);
+    }
+    return CallAsyncJavaScriptResult(value: data["value"], error: data["error"]);
+  }
+
   ///Gets the default user agent.
   ///
   ///**Official Android API**: https://developer.android.com/reference/android/webkit/WebSettings#getDefaultUserAgent(android.content.Context)

lib/src/types.dart

@@ -4623,4 +4623,41 @@ class ContentWorld {
   ///Be careful when manipulating variables in this content world.
   ///If you modify a variable with the same name as one the webpage uses, you may unintentionally disrupt the normal operation of that page.
   static ContentWorld page = ContentWorld.world(name: "page");
+
+  Map<String, dynamic> toMap() {
+    return {"name": name};
+  }
+
+  Map<String, dynamic> toJson() {
+    return this.toMap();
+  }
+
+  @override
+  String toString() {
+    return toMap().toString();
+  }
+}
+
+///Class that represents either a success or a failure, including an associated value in each case for [InAppWebViewController.callAsyncJavaScript].
+class CallAsyncJavaScriptResult {
+  ///It contains the success value.
+  dynamic value;
+
+  ///It contains the failure value.
+  dynamic error;
+
+  CallAsyncJavaScriptResult({this.value, this.error});
+
+  Map<String, dynamic> toMap() {
+    return {"value": value, "error": error};
+  }
+
+  Map<String, dynamic> toJson() {
+    return this.toMap();
+  }
+
+  @override
+  String toString() {
+    return toMap().toString();
+  }
 }