Provide the device's user agent

RNDeviceInfo/RNDeviceInfo.m

@@ -120,6 +120,12 @@ RCT_EXPORT_MODULE()
     return deviceName;
 }
 
+- (NSString*) userAgent
+{
+	UIWebView *webView = [[UIWebView alloc] initiWithFrame:CGRectZero];
+	return [webView stringByEvaluatingJavaScriptFromString:@"navigator.userAgent"];
+}
+
 - (NSDictionary *)constantsToExport
 {
     UIDevice *currentDevice = [UIDevice currentDevice];
@@ -138,6 +144,7 @@ RCT_EXPORT_MODULE()
              @"appVersion": [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleShortVersionString"],
              @"buildNumber": [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleVersion"],
              @"systemManufacturer": @"Apple",
+             @"userAgent": self.userAgent,
              };
 }
 

android/src/main/java/com/learnium/RNDeviceInfo/RNDeviceModule.java

@@ -67,6 +67,7 @@ public class RNDeviceModule extends ReactContextBaseJavaModule {
     constants.put("uniqueId", Secure.getString(this.reactContext.getContentResolver(), Secure.ANDROID_ID));
     constants.put("systemManufacturer", Build.MANUFACTURER);
     constants.put("bundleId", packageName);
+    constants.put("userAgent", System.getProperty("http.agent"));
     return constants;
   }
 }

deviceinfo.js

@@ -37,5 +37,8 @@ module.exports = {
   },
   getDeviceName: function() {
     return RNDeviceInfo.deviceName;
+  },
+  getUserAgent: function() {
+    return RNDeviceInfo.userAgent;
   }
 };