/// <summary>
/// Generates a media type attribute suitable for an <object> or <embed> tag. The media type will be included in the CSP plugin-types directive.
/// </summary>
/// <param name="helper"></param>
/// <param name="mediaType">The media type.</param>
public static IHtmlString CspMediaType(this HtmlHelper helper, string mediaType)
{
new Rfc2045MediaTypeValidator().Validate(mediaType);
var context = helper.ViewContext.HttpContext;
var cspConfigurationOverrideHelper = new CspConfigurationOverrideHelper();
var headerOverrideHelper = new HeaderOverrideHelper();
var configOverride = new CspPluginTypesOverride() { Enabled = true, InheritMediaTypes = true, MediaTypes = new[] { mediaType } };
cspConfigurationOverrideHelper.SetCspPluginTypesOverride(context, configOverride, false);
cspConfigurationOverrideHelper.SetCspPluginTypesOverride(context, configOverride, true);
headerOverrideHelper.SetCspHeaders(context, false);
headerOverrideHelper.SetCspHeaders(context, true);
var attribute = string.Format("type=\"{0}\"", helper.AttributeEncode(mediaType));
return new HtmlString(attribute);
}
/// <summary>
/// Generates a CSP nonce HTML attribute. The 120-bit random nonce will be included in the CSP style-src directive.
/// </summary>
/// <param name="helper"></param>
public static IHtmlString CspStyleNonce(this HtmlHelper helper)
{
var context = helper.ViewContext.HttpContext;
var cspConfigurationOverrideHelper = new CspConfigurationOverrideHelper();
var headerOverrideHelper = new HeaderOverrideHelper();
var nonce = cspConfigurationOverrideHelper.GetCspStyleNonce(context);
if (context.Items["NWebsecStyleNonceSet"] == null)
{
context.Items["NWebsecStyleNonceSet"] = "set";
headerOverrideHelper.SetCspHeaders(context, false);
headerOverrideHelper.SetCspHeaders(context, true);
}
return CreateNonceAttribute(helper, nonce);
}