src/wp/InAppBrowser.cs

using System;
using System.Diagnostics;
using System.IO;
using System.Runtime.Serialization;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;

#if WP8
using System.Threading.Tasks;
using Windows.ApplicationModel;
using Windows.Storage;
using Windows.System;

//Use alias in case Cordova File Plugin is enabled. Then the File class will be declared in both and error will occur.
using IOFile = System.IO.File;
#else
using Microsoft.Phone.Tasks;
#endif

namespace WPCordovaClassLib.Cordova.Commands
{
    [DataContract]
    public class BrowserOptions
    {
        [DataMember]
        public string url;

        [DataMember]
        public bool isGeolocationEnabled;
    }

    public class InAppBrowser : BaseCommand
    {

        private static WebBrowser browser;
        private static ApplicationBarIconButton backButton;
        private static ApplicationBarIconButton fwdButton;

        protected ApplicationBar AppBar;

        protected bool ShowLocation {get;set;}
        protected bool StartHidden  {get;set;}

        public void open(string options)
        {
            // reset defaults on ShowLocation + StartHidden features 
            ShowLocation = true;
            StartHidden = false;

            string[] args = JSON.JsonHelper.Deserialize<string[]>(options);
            //BrowserOptions opts = JSON.JsonHelper.Deserialize<BrowserOptions>(options);
            string urlLoc = args[0];
            string target = args[1];
            string featString = args[2];

            if (!string.IsNullOrEmpty(featString))
            {
                string[] features = featString.Split(',');
                foreach (string str in features)
                {
                    try
                    {
                        string[] split = str.Split('=');
                        switch (split[0])
                        {
                            case "location":
                                ShowLocation = split[1].StartsWith("yes", StringComparison.OrdinalIgnoreCase);
                                break;
                            case "hidden":
                                StartHidden = split[1].StartsWith("yes", StringComparison.OrdinalIgnoreCase);
                                break;
                        }
                    }
                    catch (Exception)
                    {
                        // some sort of invalid param was passed, moving on ...
                    }
                }
            }
            /*
                _self - opens in the Cordova WebView if url is in the white-list, else it opens in the InAppBrowser 
                _blank - always open in the InAppBrowser 
                _system - always open in the system web browser 
            */
            switch (target)
            {
                case "_blank":
                    ShowInAppBrowser(urlLoc);
                    break;
                case "_self":
                    ShowCordovaBrowser(urlLoc);
                    break;
                case "_system":
                    ShowSystemBrowser(urlLoc);
                    break;
            }
        }

        public void show(string options)
        {
            string[] args = JSON.JsonHelper.Deserialize<string[]>(options);


            if (browser != null)
            {
                Deployment.Current.Dispatcher.BeginInvoke(() =>
                {
                    browser.Visibility = Visibility.Visible;
                    AppBar.IsVisible = true;
                });
            }
        }

        public void injectScriptCode(string options)
        {
            string[] args = JSON.JsonHelper.Deserialize<string[]>(options);

            bool bCallback = false;
            if (bool.TryParse(args[1], out bCallback)) { };

            string callbackId = args[2];

            if (browser != null)
            {
                Deployment.Current.Dispatcher.BeginInvoke(() =>
                {
                    var res = browser.InvokeScript("eval", new string[] { args[0] });

                    if (bCallback)
                    {
                        PluginResult result = new PluginResult(PluginResult.Status.OK, res.ToString());
                        result.KeepCallback = false;
                        this.DispatchCommandResult(result);
                    }

                });
            }
        }

        public void injectScriptFile(string options)
        {
            Debug.WriteLine("Error : Windows Phone org.apache.cordova.inappbrowser does not currently support executeScript");
            string[] args = JSON.JsonHelper.Deserialize<string[]>(options);
            // throw new NotImplementedException("Windows Phone does not currently support 'executeScript'");
        }

        public void injectStyleCode(string options)
        {
            Debug.WriteLine("Error : Windows Phone org.apache.cordova.inappbrowser does not currently support insertCSS");
            return;

            //string[] args = JSON.JsonHelper.Deserialize<string[]>(options);
            //bool bCallback = false;
            //if (bool.TryParse(args[1], out bCallback)) { };

            //string callbackId = args[2];

            //if (browser != null)
            //{
                //Deployment.Current.Dispatcher.BeginInvoke(() =>
                //{
                //    if (bCallback)
                //    {
                //        string cssInsertString = "try{(function(doc){var c = '<style>body{background-color:#ffff00;}</style>'; doc.head.innerHTML += c;})(document);}catch(ex){alert('oops : ' + ex.message);}";
                //        //cssInsertString = cssInsertString.Replace("_VALUE_", args[0]);
                //        Debug.WriteLine("cssInsertString = " + cssInsertString);
                //        var res = browser.InvokeScript("eval", new string[] { cssInsertString });
                //        if (bCallback)
                //        {
                //            PluginResult result = new PluginResult(PluginResult.Status.OK, res.ToString());
                //            result.KeepCallback = false;
                //            this.DispatchCommandResult(result);
                //        }
                //    }

                //});
            //}
        }

        public void injectStyleFile(string options)
        {
            Debug.WriteLine("Error : Windows Phone org.apache.cordova.inappbrowser does not currently support insertCSS");
            return;

            //string[] args = JSON.JsonHelper.Deserialize<string[]>(options);
            //throw new NotImplementedException("Windows Phone does not currently support 'insertCSS'");
        }

        private void ShowCordovaBrowser(string url)
        {
            Uri loc = new Uri(url, UriKind.RelativeOrAbsolute);
            Deployment.Current.Dispatcher.BeginInvoke(() =>
            {
                PhoneApplicationFrame frame = Application.Current.RootVisual as PhoneApplicationFrame;
                if (frame != null)
                {
                    PhoneApplicationPage page = frame.Content as PhoneApplicationPage;
                    if (page != null)
                    {
                        CordovaView cView = page.FindName("CordovaView") as CordovaView;
                        if (cView != null)
                        {
                            WebBrowser br = cView.Browser;
                            br.Navigate(loc);
                        }
                    }

                }
            });
        }

#if WP8
        private async void ShowSystemBrowser(string url)
        {
            var pathUri = new Uri(url, UriKind.Absolute);
            if (pathUri.Scheme == Uri.UriSchemeHttp || pathUri.Scheme == Uri.UriSchemeHttps)
            {
                await Launcher.LaunchUriAsync(pathUri);
                return;
            }

            var file = await GetFile(pathUri.AbsolutePath.Replace('/', Path.DirectorySeparatorChar));
            if (file != null)
            {
                await Launcher.LaunchFileAsync(file);
            }
            else
            {
                Debug.WriteLine("File not found.");
            }
        }

        private async Task<StorageFile> GetFile(string fileName)
        {
            //first try to get the file from the isolated storage
            var localFolder = ApplicationData.Current.LocalFolder;
            if (IOFile.Exists(Path.Combine(localFolder.Path, fileName)))
            {
                return await localFolder.GetFileAsync(fileName);
            }

            //if file is not found try to get it from the xap
            var filePath = Path.Combine(Package.Current.InstalledLocation.Path, fileName);
            if (IOFile.Exists(filePath))
            {
                return await StorageFile.GetFileFromPathAsync(filePath);
            }

            return null;
        }
#else
        private void ShowSystemBrowser(string url)
        {
            WebBrowserTask webBrowserTask = new WebBrowserTask();
            webBrowserTask.Uri = new Uri(url, UriKind.Absolute);
            webBrowserTask.Show();
        }
#endif

        private void ShowInAppBrowser(string url)
        {
            Uri loc = new Uri(url, UriKind.RelativeOrAbsolute);

            Deployment.Current.Dispatcher.BeginInvoke(() =>
            {
                if (browser != null)
                {
                    //browser.IsGeolocationEnabled = opts.isGeolocationEnabled;
                    browser.Navigate(loc);
                }
                else
                {
                    PhoneApplicationFrame frame = Application.Current.RootVisual as PhoneApplicationFrame;
                    if (frame != null)
                    {
                        PhoneApplicationPage page = frame.Content as PhoneApplicationPage;

                        string baseImageUrl = "Images/";

                        if (page != null)
                        {
                            Grid grid = page.FindName("LayoutRoot") as Grid;
                            if (grid != null)
                            {
                                browser = new WebBrowser();
                                browser.IsScriptEnabled = true;
                                browser.LoadCompleted += new System.Windows.Navigation.LoadCompletedEventHandler(browser_LoadCompleted);

                                browser.Navigating += new EventHandler<NavigatingEventArgs>(browser_Navigating);
                                browser.NavigationFailed += new System.Windows.Navigation.NavigationFailedEventHandler(browser_NavigationFailed);
                                browser.Navigated += new EventHandler<System.Windows.Navigation.NavigationEventArgs>(browser_Navigated);
                                browser.Navigate(loc);

                                if (StartHidden)
                                {
                                    browser.Visibility = Visibility.Collapsed;
                                }

                                //browser.IsGeolocationEnabled = opts.isGeolocationEnabled;
                                grid.Children.Add(browser);
                            }

                            ApplicationBar bar = new ApplicationBar();
                            bar.BackgroundColor = Colors.Gray;
                            bar.IsMenuEnabled = false;

                            backButton = new ApplicationBarIconButton();
                            backButton.Text = "Back";

                            backButton.IconUri = new Uri(baseImageUrl + "appbar.back.rest.png", UriKind.Relative);
                            backButton.Click += new EventHandler(backButton_Click);
                            bar.Buttons.Add(backButton);


                            fwdButton = new ApplicationBarIconButton();
                            fwdButton.Text = "Forward";
                            fwdButton.IconUri = new Uri(baseImageUrl + "appbar.next.rest.png", UriKind.Relative);
                            fwdButton.Click += new EventHandler(fwdButton_Click);
                            bar.Buttons.Add(fwdButton);

                            ApplicationBarIconButton closeBtn = new ApplicationBarIconButton();
                            closeBtn.Text = "Close";
                            closeBtn.IconUri = new Uri(baseImageUrl + "appbar.close.rest.png", UriKind.Relative);
                            closeBtn.Click += new EventHandler(closeBtn_Click);
                            bar.Buttons.Add(closeBtn);

                            page.ApplicationBar = bar;
                            bar.IsVisible = !StartHidden;
                            AppBar = bar;

                            page.BackKeyPress += page_BackKeyPress;

                        }

                    }
                }
            });
        }

        void page_BackKeyPress(object sender, System.ComponentModel.CancelEventArgs e)
        {
#if WP8
            if (browser.CanGoBack)
            {
                browser.GoBack();
            }
            else
            {
                close();
            }
            e.Cancel = true;
#else
                    browser.InvokeScript("execScript", "history.back();");
#endif
        }

        void browser_LoadCompleted(object sender, System.Windows.Navigation.NavigationEventArgs e)
        {

        }

        void fwdButton_Click(object sender, EventArgs e)
        {
            if (browser != null)
            {
                try
                {
#if WP8
                    browser.GoForward();
#else
                    browser.InvokeScript("execScript", "history.forward();");
#endif
                }
                catch (Exception)
                {

                }
            }
        }

        void backButton_Click(object sender, EventArgs e)
        {
            if (browser != null)
            {
                try
                {
#if WP8
                    browser.GoBack();
#else
                    browser.InvokeScript("execScript", "history.back();");
#endif
                }
                catch (Exception)
                {

                }
            }
        }

        void closeBtn_Click(object sender, EventArgs e)
        {
            this.close();
        }


        public void close(string options = "")
        {
            if (browser != null)
            {
                Deployment.Current.Dispatcher.BeginInvoke(() =>
                {
                    PhoneApplicationFrame frame = Application.Current.RootVisual as PhoneApplicationFrame;
                    if (frame != null)
                    {
                        PhoneApplicationPage page = frame.Content as PhoneApplicationPage;
                        if (page != null)
                        {
                            Grid grid = page.FindName("LayoutRoot") as Grid;
                            if (grid != null)
                            {
                                grid.Children.Remove(browser);
                            }
                            page.ApplicationBar = null;
                            page.BackKeyPress -= page_BackKeyPress;
                        }
                    }
                   
                    browser = null;
                    string message = "{\"type\":\"exit\"}";
                    PluginResult result = new PluginResult(PluginResult.Status.OK, message);
                    result.KeepCallback = false;
                    this.DispatchCommandResult(result);
                });
            }
        }

        void browser_Navigated(object sender, System.Windows.Navigation.NavigationEventArgs e)
        {
#if WP8
            if (browser != null)
            {
                backButton.IsEnabled = browser.CanGoBack;
                fwdButton.IsEnabled = browser.CanGoForward;

            }
#endif
            string message = "{\"type\":\"loadstop\", \"url\":\"" + e.Uri.OriginalString + "\"}";
            PluginResult result = new PluginResult(PluginResult.Status.OK, message);
            result.KeepCallback = true;
            this.DispatchCommandResult(result);
        }

        void browser_NavigationFailed(object sender, System.Windows.Navigation.NavigationFailedEventArgs e)
        {
            string message = "{\"type\":\"error\",\"url\":\"" + e.Uri.OriginalString + "\"}";
            PluginResult result = new PluginResult(PluginResult.Status.ERROR, message);
            result.KeepCallback = true;
            this.DispatchCommandResult(result);
        }

        void browser_Navigating(object sender, NavigatingEventArgs e)
        {
            string message = "{\"type\":\"loadstart\",\"url\":\"" + e.Uri.OriginalString + "\"}";
            PluginResult result = new PluginResult(PluginResult.Status.OK, message);
            result.KeepCallback = true;
            this.DispatchCommandResult(result);
        }

    }
}