updated onLoadResource method, InAppBrowser.open url parameter has the default value: 'about:blank'

android/src/main/java/com/pichillilorenzo/flutter_inappbrowser/InAppBrowserWebViewClient.java

 package com.pichillilorenzo.flutter_inappbrowser;
 
-import android.content.ContentResolver;
-import android.content.Context;
 import android.content.Intent;
 import android.graphics.Bitmap;
 import android.net.Uri;
 import android.net.http.SslError;
 import android.os.Build;
-import android.os.Handler;
-import android.support.annotation.NonNull;
-import android.support.annotation.Nullable;
 import android.support.annotation.RequiresApi;
-import android.text.TextUtils;
 import android.util.Log;
 import android.webkit.CookieManager;
 import android.webkit.CookieSyncManager;
 import android.webkit.HttpAuthHandler;
-import android.webkit.MimeTypeMap;
 import android.webkit.SslErrorHandler;
 import android.webkit.WebResourceRequest;
 import android.webkit.WebResourceResponse;
 import android.webkit.WebView;
 import android.webkit.WebViewClient;
 
+import java.io.ByteArrayInputStream;
 import java.io.IOException;
-import java.util.Arrays;
+import java.io.InputStream;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.stream.Collectors;
 
-import okhttp3.Headers;
-import okhttp3.OkHttpClient;
 import okhttp3.Request;
 import okhttp3.Response;
 
@@ -278,28 +269,55 @@ public class InAppBrowserWebViewClient extends WebViewClient {
         Request mRequest = new Request.Builder().url(url).build();
 
         try {
+            long loadingTime = System.currentTimeMillis();
             Response response = activity.httpClient.newCall(mRequest).execute();
+            loadingTime = System.currentTimeMillis() - loadingTime;
+
             String reasonPhrase = response.message();
             if (reasonPhrase.equals("")) {
                 reasonPhrase = statusCodeMapping.get(response.code());
-                Log.d(LOG_TAG, reasonPhrase);
             }
             reasonPhrase = (reasonPhrase.equals("") || reasonPhrase == null) ? "OK" : reasonPhrase;
 
-            Map<String, String> headers = new HashMap<String, String>();
+            Map<String, String> headersResponse = new HashMap<String, String>();
             for (Map.Entry<String, List<String>> entry : response.headers().toMultimap().entrySet()) {
                 String value = "";
                 for (String val: entry.getValue()) {
                     value += (value == "") ? val : "; " + val;
                 }
-                headers.put(entry.getKey().toLowerCase(), value);
+                headersResponse.put(entry.getKey().toLowerCase(), value);
+            }
+
+            Map<String, String> headersRequest = new HashMap<String, String>();
+            for (Map.Entry<String, List<String>> entry : mRequest.headers().toMultimap().entrySet()) {
+                String value = "";
+                for (String val: entry.getValue()) {
+                    value += (value == "") ? val : "; " + val;
+                }
+                headersRequest.put(entry.getKey().toLowerCase(), value);
             }
 
             Map<String, Object> obj = new HashMap<>();
+            Map<String, Object> res = new HashMap<>();
+            Map<String, Object> req = new HashMap<>();
+
             obj.put("uuid", activity.uuid);
-            obj.put("url", url);
-            obj.put("statusCode", response.code());
-            obj.put("headers", headers);
+
+            byte[] dataBytes = response.body().bytes();
+            InputStream dataStream = new ByteArrayInputStream(dataBytes);
+
+            res.put("url", url);
+            res.put("statusCode", response.code());
+            res.put("headers", headersResponse);
+            res.put("loadingTime", loadingTime);
+            res.put("data", dataBytes);
+
+            req.put("url", url);
+            req.put("headers", headersRequest);
+            req.put("method", mRequest.method());
+
+            obj.put("response", res);
+            obj.put("request", req);
 
             InAppBrowserFlutterPlugin.channel.invokeMethod("onLoadResource", obj);
 
@@ -308,8 +326,8 @@ public class InAppBrowserWebViewClient extends WebViewClient {
                 response.header("content-encoding"),
                 response.code(),
                 reasonPhrase,
-                headers,
-                response.body().byteStream()
+                headersResponse,
+                dataStream
             );
         } catch (IOException e) {
             e.printStackTrace();

example/lib/main.dart

@@ -72,10 +72,10 @@ class MyInAppBrowser extends InAppBrowser {
   }
 
   @override
-  void onLoadResource(String url, int statusCode, Map<String, String> headers) {
-    print("\n\n resource: $url\n\n");
-    print(statusCode);
-    print(headers);
+  void onLoadResource(WebResourceResponse response, WebResourceRequest request) {
+    print(response.loadingTime.toString() + "ms " + response.url);
+    if (response.headers["content-length"] != null)
+      print(response.headers["content-length"] + " length");
   }
 
   @override
@@ -138,7 +138,7 @@ class _MyAppState extends State<MyApp> {
         body: new Center(
           child: new RaisedButton(onPressed: () {
             //chromeSafariBrowser.open("https://flutter.io/");
-            inAppBrowserFallback.open("https://flutter.io/", options: {
+            inAppBrowserFallback.open(url: "https://flutter.io/", options: {
               //"hidden": true,
               //"toolbarTopFixedTitle": "Fixed title",
               //"useShouldOverrideUrlLoading": true

ios/Classes/InAppBrowserWebViewController.swift

@@ -132,12 +132,7 @@ class InAppBrowserWebViewController: UIViewController, WKUIDelegate, WKNavigatio
     override func viewDidLoad() {
         super.viewDidLoad()
 
-        URLProtocol.wk_registerScheme("http")
-        URLProtocol.wk_registerScheme("https")
-        
-        MyURLProtocol.URLProtocolDelegate = self
-        
-        URLProtocol.registerClass(MyURLProtocol.self)
+        MyURLProtocol.wkWebViewDelegateMap[uuid] = self
         
         webView.uiDelegate = self
         webView.navigationDelegate = self
@@ -303,8 +298,21 @@ class InAppBrowserWebViewController: UIViewController, WKUIDelegate, WKNavigatio
         if ((browserOptions?.userAgent)! != "") {
             if #available(iOS 9.0, *) {
                 self.webView.customUserAgent = (browserOptions?.userAgent)!
-            } else {
-                // Fallback on earlier versions
+            }
+        }
+        
+        // set uuid in the User-Agent in order to know which webview is making internal requests and
+        // to send the onLoadResource event to the correct webview
+        if #available(iOS 9.0, *) {
+            if (self.webView.customUserAgent != nil) {
+                self.webView.customUserAgent = self.webView.customUserAgent! + " WKWebView/" + self.uuid
+            }
+            else {
+                self.webView.evaluateJavaScript("navigator.userAgent") { [weak webView] (result, error) in
+                    if let webView = self.webView, let userAgent = result as? String {
+                        webView.customUserAgent = userAgent + " WKWebView/" + self.uuid
+                    }
+                }
             }
         }
         
@@ -491,7 +499,6 @@ class InAppBrowserWebViewController: UIViewController, WKUIDelegate, WKNavigatio
     func webView(_ webView: WKWebView,
                  decidePolicyFor navigationResponse: WKNavigationResponse,
                  decisionHandler: @escaping (WKNavigationResponsePolicy) -> Void) {
-        
         //dump((navigationResponse.response as! HTTPURLResponse))
         //print(navigationResponse.response.mimeType)
         //print(navigationResponse.response.url)
@@ -569,8 +576,8 @@ class InAppBrowserWebViewController: UIViewController, WKUIDelegate, WKNavigatio
         navigationDelegate?.onLoadError(uuid: self.uuid, webView: webView, error: error)
     }
     
-    func didReceiveResponse(_ response: URLResponse, from request: URLRequest?) {
-        navigationDelegate?.onLoadResource(uuid: self.uuid, webView: webView, response: response)
+    func didReceiveResponse(_ response: URLResponse, fromRequest request: URLRequest?, withData data: Data, loadingTime time: Int) {
+        navigationDelegate?.onLoadResource(uuid: self.uuid, webView: webView, response: response, fromRequest: request, withData: data, loadingTime: time)
     }
     
     func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {

ios/Classes/MyURLProtocol.swift

@@ -6,29 +6,47 @@
 //
 
 import Foundation
+import WebKit
+
+
+func currentTimeInMilliSeconds() -> Int {
+    let currentDate = Date()
+    let since1970 = currentDate.timeIntervalSince1970
+    return Int(since1970 * 1000)
+}
 
 class MyURLProtocol: URLProtocol {
     
-    struct Constants {
-        static let RequestHandledKey = "URLProtocolRequestHandled"
-    }
+//    struct Constants {
+//        static let RequestHandledKey = "URLProtocolRequestHandled"
+//    }
     
+    var wkWebViewUuid: String?
     var session: URLSession?
     var sessionTask: URLSessionDataTask?
-    static var URLProtocolDelegate: MyURLProtocolDelegate?
+    var response: URLResponse?
+    var data: Data?
+    static var wkWebViewDelegateMap: [String: MyURLProtocolDelegate] = [:]
+    var loadingTime: Int = 0
     
     override init(request: URLRequest, cachedResponse: CachedURLResponse?, client: URLProtocolClient?) {
         super.init(request: request, cachedResponse: cachedResponse, client: client)
         
-        if session == nil {
+        self.wkWebViewUuid = MyURLProtocol.getUuid(request)
+        
+        if session == nil && self.wkWebViewUuid != nil {
             session = URLSession(configuration: .default, delegate: self, delegateQueue: nil)
         }
     }
     
     override class func canInit(with request: URLRequest) -> Bool {
-        if MyURLProtocol.property(forKey: Constants.RequestHandledKey, in: request) != nil {
+
+        if getUuid(request) == nil {
             return false
         }
+//        if MyURLProtocol.property(forKey: Constants.RequestHandledKey, in: request) != nil {
+//            return false
+//        }
         return true
     }
     
@@ -38,25 +56,54 @@ class MyURLProtocol: URLProtocol {
     
     override func startLoading() {
         let newRequest = ((request as NSURLRequest).mutableCopy() as? NSMutableURLRequest)!
-        MyURLProtocol.setProperty(true, forKey: Constants.RequestHandledKey, in: newRequest)
+        loadingTime = currentTimeInMilliSeconds()
+        //MyURLProtocol.setProperty(true, forKey: Constants.RequestHandledKey, in: newRequest)
         sessionTask = session?.dataTask(with: newRequest as URLRequest)
         sessionTask?.resume()
     }
     
     override func stopLoading() {
+        if let uuid = self.wkWebViewUuid {
+            if MyURLProtocol.wkWebViewDelegateMap[uuid] != nil && self.response != nil {
+                loadingTime = currentTimeInMilliSeconds() - loadingTime
+                if self.data == nil {
+                    self.data = Data()
+                }
+                MyURLProtocol.wkWebViewDelegateMap[uuid]!.didReceiveResponse(self.response!, fromRequest: request, withData: self.data!, loadingTime: loadingTime)
+            }
+        }
+        
         sessionTask?.cancel()
     }
+    
+    class func getUuid(_ request: URLRequest?) -> String? {
+        let userAgent: String? = request?.allHTTPHeaderFields?["User-Agent"]
+        var uuid: String? = nil
+        if userAgent != nil {
+            if userAgent!.contains("WKWebView/") {
+                let userAgentSplitted = userAgent!.split(separator: " ")
+                uuid = String(userAgentSplitted[userAgentSplitted.count-1]).replacingOccurrences(of: "WKWebView/", with: "")
+            }
+        }
+        return uuid
+    }
 }
 
 extension MyURLProtocol: URLSessionDataDelegate {
     func urlSession(_ session: URLSession, dataTask: URLSessionDataTask, didReceive data: Data) {
+        if self.data == nil {
+            self.data = data
+        }
+        else {
+            self.data!.append(data)
+        }
         client?.urlProtocol(self, didLoad: data)
     }
     
     func urlSession(_ session: URLSession, dataTask: URLSessionDataTask, didReceive response: URLResponse, completionHandler: @escaping (URLSession.ResponseDisposition) -> Void) {
         let policy = URLCache.StoragePolicy(rawValue: request.cachePolicy.rawValue) ?? .notAllowed
+        self.response = response
         client?.urlProtocol(self, didReceive: response, cacheStoragePolicy: policy)
-        MyURLProtocol.URLProtocolDelegate?.didReceiveResponse(response, from: dataTask.currentRequest)
         completionHandler(.allow)
     }
     
@@ -98,5 +145,5 @@ extension MyURLProtocol: URLSessionDataDelegate {
 }
 
 protocol MyURLProtocolDelegate {
-    func didReceiveResponse(_ response: URLResponse, from request: URLRequest?)
+    func didReceiveResponse(_ response: URLResponse, fromRequest request: URLRequest?, withData data: Data, loadingTime time: Int)
 }

ios/Classes/SwiftFlutterPlugin.swift

@@ -46,6 +46,9 @@ public class SwiftFlutterPlugin: NSObject, FlutterPlugin {
     }
     
     public static func register(with registrar: FlutterPluginRegistrar) {
+        URLProtocol.wk_registerScheme("http")
+        URLProtocol.wk_registerScheme("https")
+        URLProtocol.registerClass(MyURLProtocol.self)
         let channel = FlutterMethodChannel(name: "com.pichillilorenzo/flutter_inappbrowser", binaryMessenger: registrar.messenger())
         let instance = SwiftFlutterPlugin(with: registrar)
         registrar.addMethodCallDelegate(instance, channel: channel)
@@ -489,16 +492,28 @@ public class SwiftFlutterPlugin: NSObject, FlutterPlugin {
         }
     }
     
-    func onLoadResource(uuid: String, webView: WKWebView, response: URLResponse) {
+    func onLoadResource(uuid: String, webView: WKWebView, response: URLResponse, fromRequest request: URLRequest?, withData data: Data, loadingTime time: Int) {
         if self.webViewControllers[uuid] != nil {
-            var headers = (response as! HTTPURLResponse).allHeaderFields as! [String: String]
-            headers.lowercaseKeys()
+            var headersResponse = (response as! HTTPURLResponse).allHeaderFields as! [String: String]
+            headersResponse.lowercaseKeys()
+            
+            var headersRequest = request!.allHTTPHeaderFields! as [String: String]
+            headersRequest.lowercaseKeys()
             
             let arguments: [String : Any] = [
                 "uuid": uuid,
-                "url": response.url?.absoluteString ?? "",
+                "response": [
+                    "url": response.url!.absoluteString,
                     "statusCode": (response as! HTTPURLResponse).statusCode,
-                "headers": headers
+                    "headers": headersResponse,
+                    "loadingTime": time,
+                    "data": data
+                ],
+                "request": [
+                    "url": request!.url!.absoluteString,
+                    "headers": headersRequest,
+                    "method": request!.httpMethod!
+                ]
             ]
             channel.invokeMethod("onLoadResource", arguments: arguments)
         }

lib/flutter_inappbrowser.dart

@@ -21,6 +21,7 @@
 
 import 'dart:async';
 import 'dart:collection';
+import 'dart:typed_data';
 
 import 'package:flutter/services.dart';
 import 'package:uuid/uuid.dart';
@@ -34,6 +35,28 @@ enum ConsoleMessageLevel {
   DEBUG, ERROR, LOG, TIP, WARNING
 }
 
+class WebResourceRequest {
+
+  String url;
+  Map<String, String> headers;
+  String method;
+
+  WebResourceRequest(this.url, this.headers, this.method);
+
+}
+
+class WebResourceResponse {
+
+  String url;
+  Map<String, String> headers;
+  int statusCode;
+  int loadingTime;
+  Uint8List data;
+
+  WebResourceResponse(this.url, this.headers, this.statusCode, this.loadingTime, this.data);
+
+}
+
 ///Public class representing a JavaScript console message from WebCore.
 ///This could be a issued by a call to one of the console logging functions (e.g. console.log('...')) or a JavaScript error on the page.
 ///
@@ -107,10 +130,27 @@ class InAppBrowser {
         shouldOverrideUrlLoading(url);
         break;
       case "onLoadResource":
-        String url = call.arguments["url"];
-        int statusCode = call.arguments["statusCode"];
-        Map<dynamic, dynamic> headers = call.arguments["headers"];
-        onLoadResource(url, statusCode, headers.cast<String, String>());
+        Map<dynamic, dynamic> rawResponse = call.arguments["response"];
+        rawResponse = rawResponse.cast<String, dynamic>();
+        Map<dynamic, dynamic> rawRequest = call.arguments["request"];
+        rawRequest = rawRequest.cast<String, dynamic>();
+
+        String urlResponse = rawResponse["url"];
+        Map<dynamic, dynamic> headersResponse = rawResponse["headers"];
+        headersResponse = headersResponse.cast<String, String>();
+        int statusCode = rawResponse["statusCode"];
+        int loadingTime = rawResponse["loadingTime"];
+        Uint8List data = rawResponse["data"];
+
+        String urlRequest = rawRequest["url"];
+        Map<dynamic, dynamic> headersRequest = rawRequest["headers"];
+        headersRequest = headersResponse.cast<String, String>();
+        String method = rawRequest["method"];
+
+        var response = new WebResourceResponse(urlResponse, headersResponse, statusCode, loadingTime, data);
+        var request = new WebResourceRequest(urlRequest, headersRequest, method);
+
+        onLoadResource(response, request);
         break;
       case "onConsoleMessage":
         String sourceURL = call.arguments["sourceURL"];
@@ -187,7 +227,7 @@ class InAppBrowser {
   ///  - __allowsInlineMediaPlayback__: Set to `true` to allow HTML5 media playback to appear inline within the screen layout, using browser-supplied controls rather than native controls. For this to work, add the `webkit-playsinline` attribute to any `<video>` elements. The default value is `false`.
   ///  - __allowsPictureInPictureMediaPlayback__: Set to `true` to allow HTML5 videos play picture-in-picture. The default value is `true`.
   ///  - __spinner__: Set to `false` to hide the spinner when the WebView is loading a page. The default value is `true`.
-  Future<void> open(String url, {Map<String, String> headers = const {}, String target = "_self", Map<String, dynamic> options = const {}}) async {
+  Future<void> open({String url = "about:blank", Map<String, String> headers = const {}, String target = "_self", Map<String, dynamic> options = const {}}) async {
     Map<String, dynamic> args = <String, dynamic>{};
     args.putIfAbsent('uuid', () => uuid);
     args.putIfAbsent('url', () => url);
@@ -328,8 +368,8 @@ class InAppBrowser {
 
   }
 
-  ///Event fires when the [InAppBrowser] webview will load the resource specified by the given [url].
-  void onLoadResource(String url, int statusCode, Map<String, String> headers) {
+  ///Event fires when the [InAppBrowser] webview will load the resource specified by the given [WebResourceRequest].
+  void onLoadResource(WebResourceResponse response, WebResourceRequest request) {
 
   }
 

pubspec.yaml

 name: flutter_inappbrowser
 description: A Flutter plugin that allows you to open an in-app browser window. (inspired by the popular cordova-plugin-inappbrowser).
-version: 0.2.1
+version: 0.3.0
 author: Lorenzo Pichilli <pichillilorenzo@gmail.com>
 homepage: https://github.com/pichillilorenzo/flutter_inappbrowser