Add Firefox addon install using manifest.json

Firefox addons/extensions built with WebExtensions API have a
manifest.json instead of install.rdf. When Selenium extract the
addon/extenion id, it only looks for install.rdf. This fix adds
extracting the addon/extension id from the manifest.json in addition to
install.rdf.

Fixes SeleniumHQ#4093

Signed-off-by: Jim Evans <james.h.evans.jr@gmail.com>

dotnet/src/webdriver/Firefox/FirefoxExtension.cs

@@ -1,4 +1,4 @@
-// <copyright file="FirefoxExtension.cs" company="WebDriver Committers">
+// <copyright file="FirefoxExtension.cs" company="WebDriver Committers">
 // Licensed to the Software Freedom Conservancy (SFC) under one
 // or more contributor license agreements. See the NOTICE file
 // distributed with this work for additional information
@@ -18,11 +18,15 @@
 
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 using System.IO;
 using System.IO.Compression;
 using System.Xml;
+using Newtonsoft.Json.Linq;
 using OpenQA.Selenium.Internal;
 
+
+
 namespace OpenQA.Selenium.Firefox
 {
     /// <summary>
@@ -31,6 +35,8 @@ namespace OpenQA.Selenium.Firefox
     public class FirefoxExtension
     {
         private const string EmNamespaceUri = "http://www.mozilla.org/2004/em-rdf#";
+        private const string RdfManifestFileName = "install.rdf";
+        private const string JsonManifestFileName = "manifest.json";
 
         private string extensionFileName;
         private string extensionResourceId;
@@ -95,7 +101,7 @@ public void Install(string profileDirectory)
 
             // Then, copy the contents of the temporarly location into the
             // proper location in the Firefox profile directory.
-            string id = ReadIdFromInstallRdf(tempFileName);
+            string id = GetExtensionId(tempFileName);
             string extensionDirectory = Path.Combine(Path.Combine(profileDirectory, "extensions"), id);
             if (Directory.Exists(extensionDirectory))
             {
@@ -110,12 +116,32 @@ public void Install(string profileDirectory)
             FileUtilities.DeleteDirectory(stagingDirectoryName);
         }
 
+        private static string GetExtensionId(string root)
+        {
+            // Checks if manifest.json or install.rdf file exists and extracts
+            // the addon/extenion id from the file accordingly
+            string manifestJsonPath = Path.Combine(root, JsonManifestFileName);
+            string installRdfPath = Path.Combine(root, RdfManifestFileName);
+
+            if (File.Exists(installRdfPath))
+            {
+                return ReadIdFromInstallRdf(root);
+            }
+
+            if (File.Exists(manifestJsonPath))
+            {
+                return ReadIdFromManifestJson(root);
+            }
+
+            throw new WebDriverException("Extension should contain either install.rdf or manifest.json metadata file");
+        }
+
         private static string ReadIdFromInstallRdf(string root)
         {
             string id = null;
+            string installRdf = Path.Combine(root, "install.rdf");
             try
             {
-                string installRdf = Path.Combine(root, "install.rdf");
                 XmlDocument rdfXmlDocument = new XmlDocument();
                 rdfXmlDocument.Load(installRdf);
 
@@ -152,5 +178,33 @@ private static string ReadIdFromInstallRdf(string root)
 
             return id;
         }
+
+        private static string ReadIdFromManifestJson(string root)
+        {
+            string id = null;
+            string manifestJsonPath = Path.Combine(root, JsonManifestFileName);
+            var manifestObject = JObject.Parse(File.ReadAllText(manifestJsonPath));
+            if (manifestObject["applications"] != null)
+            {
+                var applicationObject = manifestObject["applications"];
+                if (applicationObject["gecko"] != null)
+                {
+                    var geckoObject = applicationObject["gecko"];
+                    if (geckoObject["id"] != null)
+                    {
+                        id = geckoObject["id"].ToString().Trim();
+                    }
+                }
+            }
+
+            if (string.IsNullOrEmpty(id))
+            {
+                string addInName = manifestObject["name"].ToString().Replace(" ", "");
+                string addInVersion = manifestObject["version"].ToString();
+                id = string.Format(CultureInfo.InvariantCulture, "{0}@{1}", addInName, addInVersion);
+            }
+
+            return id;
+        }
     }
 }

go.bat

@@ -1,3 +1,2 @@
 @echo off
-
 java -Xmx4096m -XX:MetaspaceSize=1024m -XX:ReservedCodeCacheSize=512m -client -jar third_party\jruby\jruby-complete.jar -X-C -S rake %*