Add ssl error handling (https://github.com/react-native-community/react-native-webview/pull/1450)

android/src/main/java/com/reactnativecommunity/webview/RNCWebViewManager.java

@@ -33,6 +33,7 @@ import android.content.pm.PackageManager;
 import android.graphics.Bitmap;
 import android.graphics.Color;
 import android.Manifest;
+import android.net.http.SslError;
 import android.net.Uri;
 import android.os.Build;
 import android.os.Environment;
@@ -49,6 +50,7 @@ import android.webkit.CookieManager;
 import android.webkit.DownloadListener;
 import android.webkit.GeolocationPermissions;
 import android.webkit.JavascriptInterface;
+import android.webkit.SslErrorHandler;
 import android.webkit.PermissionRequest;
 import android.webkit.URLUtil;
 import android.webkit.ServiceWorkerController;
@@ -1130,6 +1132,50 @@ public class RNCWebViewManager extends SimpleViewManager<WebView> {
     }
 
 
+    @Override
+    public void onReceivedSslError(final WebView webView, final SslErrorHandler handler, final SslError error) {
+      handler.cancel();
+
+      int code = error.getPrimaryError();
+      String failingUrl = error.getUrl();
+      String description = "";
+      String descriptionPrefix = "SSL error: ";
+ 
+      // https://developer.android.com/reference/android/net/http/SslError.html
+      switch (code) {
+        case SslError.SSL_DATE_INVALID:
+          description = "The date of the certificate is invalid";
+          break;
+        case SslError.SSL_EXPIRED:
+          description = "The certificate has expired";
+          break;
+        case SslError.SSL_IDMISMATCH:
+          description = "Hostname mismatch";
+          break;
+        case SslError.SSL_INVALID:
+          description = "A generic error occurred";
+          break;
+        case SslError.SSL_NOTYETVALID:
+          description = "The certificate is not yet valid";
+          break;
+        case SslError.SSL_UNTRUSTED:
+          description = "The certificate authority is not trusted";
+          break;
+        default: 
+          description = "Unknown SSL Error";
+          break;
+      }
+ 
+       description = descriptionPrefix + description;
+ 
+       this.onReceivedError(
+        webView,
+        code,
+        description,
+        failingUrl
+      );
+    }
+
     @Override
     public void onReceivedError(
       WebView webView,