Merge pull request pichillilorenzo#8 from jj-lin/iOS-Google-login

iOS Google Login

ios/Classes/InAppWebView.swift

@@ -1505,9 +1505,18 @@ public class InAppWebView: WKWebView, UIScrollViewDelegate, WKUIDelegate, WKNavi
         if let url = navigationAction.request.url {
 
             if activateShouldOverrideUrlLoading && (options?.useShouldOverrideUrlLoading)! {
-                
+
                 let isForMainFrame = navigationAction.targetFrame?.isMainFrame ?? false
-
+                let socialLogin = SocialLogin(url: url)
+                if case .google = socialLogin {
+                    decisionHandler(.cancel)
+                    _ = createSocialLoginWindow(from: webView,
+                                                createWebViewWith: configuration,
+                                                urlRequest: navigationAction.request,
+                                                socialLogin: socialLogin)
+                    return
+                }
+
                 shouldOverrideUrlLoading(url: url, method: navigationAction.request.httpMethod, headers: navigationAction.request.allHTTPHeaderFields, isForMainFrame: isForMainFrame, navigationType: navigationAction.navigationType, result: { (result) -> Void in
                     if result is FlutterError {
                         print((result as! FlutterError).message ?? "")
@@ -2068,9 +2077,44 @@ public class InAppWebView: WKWebView, UIScrollViewDelegate, WKUIDelegate, WKNavi
 
     var popupWebView : WKWebView?
 
-    // sample url: https://m.facebook.com/v2.8/dialog/oauth?app_id=1091264071008011....
-    func isFacebookLogin(url: URL) -> Bool {
-        return url.host?.contains("facebook") == true && url.path.contains("oauth")
+    enum SocialLogin {
+        case facebook
+        case google
+        case none
+
+        // sample url: https://m.facebook.com/v2.8/dialog/oauth?app_id=1091264071008011....
+        static func isFacebookLogin(url: URL) -> Bool {
+            return url.host?.contains("facebook") == true && url.path.contains("/oauth")
+        }
+
+        // sample url: https://accounts.google.com/o/oauth2/auth?redirect_uri=storagerelay%3A%2F%2Fhtt
+        static func isGoogleLogin(url: URL) -> Bool {
+            return url.host?.contains("google") == true && url.path.contains("/auth")
+        }
+
+        init(url: URL) {
+            switch url {
+            case _ where SocialLogin.isFacebookLogin(url: url): self = .facebook
+            case _ where SocialLogin.isGoogleLogin(url: url): self = .google
+            default: self = .none
+            }
+        }
+    }
+
+    func createSocialLoginWindow(from webView: WKWebView,
+                                 createWebViewWith configuration: WKWebViewConfiguration,
+                                 urlRequest: URLRequest,
+                                 socialLogin: SocialLogin) -> WKWebView {
+        let newWebView = WKWebView(frame: webView.frame, configuration: configuration)
+        if #available(iOS 9.0, *), case .google = socialLogin {
+            // Avoid google 403 disallowed_useragent issue
+            newWebView.customUserAgent = "Mozilla/5.0 (Macintosh) AppleWebKit/605.1.15 (KHTML, like Gecko)"
+        }
+        newWebView.uiDelegate = self
+        webView.superview?.addSubview(newWebView)
+        newWebView.load(urlRequest)
+        popupWebView = newWebView
+        return newWebView
     }
 
     public func webView(_ webView: WKWebView,
@@ -2079,17 +2123,22 @@ public class InAppWebView: WKWebView, UIScrollViewDelegate, WKUIDelegate, WKNavi
                   windowFeatures: WKWindowFeatures) -> WKWebView? {
         guard let url = navigationAction.request.url else { return nil }
 
-        if navigationAction.targetFrame?.isMainFrame != true && isFacebookLogin(url: url) {
-            let newWebView = WKWebView(frame: webView.frame, configuration: configuration)
-            newWebView.load(navigationAction.request)
-            newWebView.uiDelegate = self
-            webView.superview?.addSubview(newWebView)
-            popupWebView = newWebView
-            return newWebView
+        if navigationAction.targetFrame?.isMainFrame == true {
+            onCreateWindow(url: url, navigationType: navigationAction.navigationType)
+            return nil
         }
 
-        onCreateWindow(url: url, navigationType: navigationAction.navigationType)
-        return nil
+        let socialLogin = SocialLogin(url: url)
+        switch socialLogin {
+        case .none:
+            onCreateWindow(url: url, navigationType: navigationAction.navigationType)
+            return nil
+        case .facebook, .google:
+            return createSocialLoginWindow(from: webView,
+                                           createWebViewWith: configuration,
+                                           urlRequest: navigationAction.request,
+                                           socialLogin: socialLogin)
+        }
     }
 
     public func webViewDidClose(_ webView: WKWebView) {