/// <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="publicKey">Sets the public key of recaptcha.</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="dataType">Sets the data type of recaptcha.</param>
/// <param name="dataSize">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 IHtmlString Recaptcha(
this HtmlHelper htmlHelper,
string publicKey = "{recaptchaPublicKey}",
RecaptchaTheme theme = RecaptchaTheme.Red,
string language = null,
int tabIndex = 0,
RecaptchaDataType?dataType = null,
RecaptchaDataSize?dataSize = null,
SslBehavior useSsl = SslBehavior.SameAsRequestUrl,
string apiVersion = "{recaptchaApiVersion}")
{
IRecaptchaHtmlHelper rHtmlHelper = null;
string version = RecaptchaKeyHelper.ParseKey(apiVersion);
if (version != "2")
{
rHtmlHelper = new RecaptchaHtmlHelper(publicKey, theme, language, tabIndex, useSsl);
}
else
{
rHtmlHelper = new Recaptcha2HtmlHelper(publicKey, theme, language, tabIndex, dataType, dataSize, useSsl);
}
var writer = new HtmlTextWriter(new StringWriter());
writer.Write(rHtmlHelper.ToString());
return(htmlHelper.Raw(writer.InnerWriter.ToString()));
}
/// <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
{
IRecaptchaHtmlHelper htmlHelper = null;
string apiVersion = RecaptchaKeyHelper.ParseKey(ApiVersion);
if (apiVersion != "2")
{
htmlHelper = new RecaptchaHtmlHelper(this.PublicKey, this.Theme, this.Language, this.TabIndex, this.UseSsl);
}
else
{
htmlHelper = new Recaptcha2HtmlHelper(this.PublicKey, this.Theme, this.Language, this.TabIndex, this.DataType, this.DataSize, this.UseSsl);
}
output.Write(htmlHelper.ToString());
}
}
