+ (NSString*) wkProperty
{
    NSLog(@"[BackgroundMode Plugin] - wkProperty");

    NSString* str = @"YWx3YXlzUnVuc0F0Rm9yZWdyb3VuZFByaW9yaXR5";
    NSData* data  = [[NSData alloc] initWithBase64EncodedString:str options:0];

    return [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
}

/**
 * Swizzle some implementations of CDVWKWebViewEngine.
 */
+ (void) swizzleWKWebViewEngine
{
    NSLog(@"[BackgroundMode Plugin] - swizzleWKWebViewEngine");

    if (![self isRunningWebKit])
        return;

    Class wkWebViewEngineCls = NSClassFromString(@"CDVWKWebViewEngine");
    SEL selector = NSSelectorFromString(@"createConfigurationFromSettings:");

    SwizzleSelectorWithBlock_Begin(wkWebViewEngineCls, selector)
    ^(CDVPlugin *self, NSDictionary *settings) {
        id obj = ((id (*)(id, SEL, NSDictionary*))_imp)(self, _cmd, settings);

        [obj setValue:[NSNumber numberWithBool:YES]
               forKey:[APPBackgroundMode wkProperty]];

        [obj setValue:[NSNumber numberWithBool:NO]
               forKey:@"requiresUserActionForMediaPlayback"];

        return obj;
    }
    SwizzleSelectorWithBlock_End;
}