/// <summary>
/// Renders the recaptcha HTML in an MVC view. It is an extension method to the <see cref="System.Web.Mvc.HtmlHelper"/> class.
/// </summary>
/// <param name="htmlHelper">The <see cref="System.Web.Mvc.HtmlHelper"/> object to which the extension is added.</param>
/// <param name="siteKey">Sets the site key of recaptcha.</param>
/// <param name="renderApiScript">Determines if the API script call is to be rendered.</param>
/// <param name="theme">Sets the theme of recaptcha.</param>
/// <param name="language">Sets the language of recaptcha. If no language is specified, the language of the current UI culture will be used.</param>
/// <param name="tabIndex">Sets the tab index of recaptcha.</param>
/// <param name="size">Sets the size of recaptcha.</param>
/// <param name="useSsl">Sets the value to the UseSsl property.</param>
/// <param name="apiVersion">Determines the version of the reCAPTCHA API.</param>
/// <returns>Returns an instance of the IHtmlString type.</returns>
public static IHtmlContent RecaptchaWidget(
this IHtmlHelper htmlHelper,
string siteKey = null,
bool renderApiScript = true,
RecaptchaTheme?theme = null,
string language = null,
int?tabIndex = null,
RecaptchaSize?size = null,
RecaptchaSslBehavior?useSsl = null,
string apiVersion = null)
{
var config = RecaptchaConfigurationManager.GetConfiguration();
string ver;
if (!string.IsNullOrEmpty(apiVersion))
{
ver = apiVersion;
}
else
{
ver = config.ApiVersion;
}
if (ver == null || ver == "2")
{
var rHtmlHelper = new Recaptcha2HtmlHelper(siteKey ?? config.SiteKey);
return(new HtmlString(rHtmlHelper.CreateWidgetHtml(renderApiScript, theme != null ? (RecaptchaTheme)theme : config.Theme, language ?? config.Language, tabIndex != null ? (int)tabIndex : 0, size != null ? (RecaptchaSize)size : config.Size, useSsl != null ? (RecaptchaSslBehavior)useSsl : config.UseSsl)));
}
else
{
throw new InvalidOperationException("The API version is either invalid or not supported.");
}
}
/// <summary>
/// Redners the HTML output. This method is automatically called by ASP.NET during the rendering process.
/// </summary>
/// <param name="output">The output object to which the method will write HTML to.</param>
/// <exception cref="InvalidOperationException">The exception is thrown if the public key is not set.</exception>
protected override void RenderContents(HtmlTextWriter output)
{
if (this.DesignMode)
{
output.Write("<p>Recaptcha Control</p>");
}
else
{
if (ApiVersion == null || ApiVersion == "2")
{
var htmlHelper = new Recaptcha2HtmlHelper(this.SiteKey);
output.Write(htmlHelper.CreateWidgetHtml(RenderApiScript, Theme, Language, TabIndex, Size, UseSsl));
}
else
{
throw new InvalidOperationException("The API version is either invalid or not supported.");
}
}
}