polatengin/969

## 969
// Asp.Net Core uygulamalarında Google reCaptcha kullanımı

http://www.enginpolat.com/asp-net-core-uygulamalarinda-google-recaptcha-kullanimi

## dependencies.js
"dependencies": {
	"Microsoft.AspNetCore.Mvc": "1.0.1"
}

## HomeController-HttpPostIndex-CheckCaptcha.cs
[HttpPost]
public async Task<IActionResult> Index(string username, string password)
{
	var captchaImage = HttpContext.Request.Form["g-recaptcha-response"];
	if (string.IsNullOrEmpty(captchaImage))
	{
		ModelState.AddModelError("captcha", "Captcha doğrulanmamış");
		return View();
	}

	var verified = await CheckCaptcha();
	if (!verified)
	{
		ModelState.AddModelError("captcha", "Captcha yanlış doğrulanmış");
		return View();
	}

	if (ModelState.IsValid)
	{
		//Herşey doğru
	}

	return View();
}

private async Task<bool> CheckCaptcha()
{
	var postData = new List<KeyValuePair<string, string>>()
	{
		new KeyValuePair<string, string>("secret", "6Ld29gYUAAAAAMAOFcvyxvqKHgbHBIwhZ694wOs0"),
		new KeyValuePair<string, string>("remoteip", HttpContext.Connection.RemoteIpAddress.ToString()),
		new KeyValuePair<string, string>("response", HttpContext.Request.Form["g-recaptcha-response"])
	};

	var client = new HttpClient();
	var response = await client.PostAsync("https://www.google.com/recaptcha/api/siteverify", new FormUrlEncodedContent(postData));

	var o = (JObject)JsonConvert.DeserializeObject(await response.Content.ReadAsStringAsync());

	return (bool)o["success"];
}

## HomeController-Index.cs
using Microsoft.AspNetCore.Mvc;

public class HomeController : Controller
{
	public IActionResult Index()
	{
		return View();
	}
}

## Index.cshtml
<!doctype html>
<html lang="tr">
	<head>
		<title>AspNet Core ve Google reCaptcha</title>
		<meta charset="utf-8" />
		<script src="https://www.google.com/recaptcha/api.js"></script>
	</head>
	<body>
		<form method="POST">
			<div>
				Kullanıcı Adı : <input type="text" name="username" />
			</div>
			<div>
				Şifre : <input type="password" name="password" />
			</div>
			<div class="g-recaptcha" data-sitekey="6Ld29gYUAAAAADzK8cpOqjohFsLwxlpJLHYNbveZ"></div>
			<div>
				<input type="submit" value="Giriş" />
			</div>
		</form>
	</body>
</html>

## Startup.cs
public void ConfigureServices(IServiceCollection services)
{
	services.AddMvc();
}

public void Configure(IApplicationBuilder app)
{
	app.UseMvc(routes =>
	{
		routes.MapRoute(name: "Default", template: "{controller=Home}/{action=Index}");
	});
}

## yo.cmd
yo aspnet
// Empty Web Application seçeneğini seçiyoruz
// Projeye asp-net-core-google-recaptcha ismini veriyoruz
	// Asp.Net Core uygulamalarında Google reCaptcha kullanımı

	http://www.enginpolat.com/asp-net-core-uygulamalarinda-google-recaptcha-kullanimi
	[HttpPost]
	public async Task<IActionResult> Index(string username, string password)
	{
	var captchaImage = HttpContext.Request.Form["g-recaptcha-response"];
	if (string.IsNullOrEmpty(captchaImage))
	{
	ModelState.AddModelError("captcha", "Captcha doğrulanmamış");
	return View();
	}

	var verified = await CheckCaptcha();
	if (!verified)
	{
	ModelState.AddModelError("captcha", "Captcha yanlış doğrulanmış");
	return View();
	}

	if (ModelState.IsValid)
	{
	//Herşey doğru
	}

	return View();
	}

	private async Task<bool> CheckCaptcha()
	{
	var postData = new List<KeyValuePair<string, string>>()
	{
	new KeyValuePair<string, string>("secret", "6Ld29gYUAAAAAMAOFcvyxvqKHgbHBIwhZ694wOs0"),
	new KeyValuePair<string, string>("remoteip", HttpContext.Connection.RemoteIpAddress.ToString()),
	new KeyValuePair<string, string>("response", HttpContext.Request.Form["g-recaptcha-response"])
	};

	var client = new HttpClient();
	var response = await client.PostAsync("https://www.google.com/recaptcha/api/siteverify", new FormUrlEncodedContent(postData));

	var o = (JObject)JsonConvert.DeserializeObject(await response.Content.ReadAsStringAsync());

	return (bool)o["success"];
	}
	using Microsoft.AspNetCore.Mvc;

	public class HomeController : Controller
	{
	public IActionResult Index()
	{
	return View();
	}
	}
	<!doctype html>
	<html lang="tr">
	<head>
	<title>AspNet Core ve Google reCaptcha</title>
	<meta charset="utf-8" />
	<script src="https://www.google.com/recaptcha/api.js"></script>
	</head>
	<body>
	<form method="POST">
	<div>
	Kullanıcı Adı : <input type="text" name="username" />
	</div>
	<div>
	Şifre : <input type="password" name="password" />
	</div>
	<div class="g-recaptcha" data-sitekey="6Ld29gYUAAAAADzK8cpOqjohFsLwxlpJLHYNbveZ"></div>
	<div>
	<input type="submit" value="Giriş" />
	</div>
	</form>
	</body>
	</html>
	public void ConfigureServices(IServiceCollection services)
	{
	services.AddMvc();
	}

	public void Configure(IApplicationBuilder app)
	{
	app.UseMvc(routes =>
	{
	routes.MapRoute(name: "Default", template: "{controller=Home}/{action=Index}");
	});
	}
	yo aspnet
	// Empty Web Application seçeneğini seçiyoruz
	// Projeye asp-net-core-google-recaptcha ismini veriyoruz