/// <summary>
/// Generates meta tags for the given content.
/// </summary>
/// <param name="app">The application service</param>
/// <param name="content">The content</param>
/// <param name="meta">If meta tags should be generated</param>
/// <param name="opengraph">If open graph tags should be generated</param>
/// <param name="generator">If generator tag should be generated</param>
/// <returns>The meta tags</returns>
public static HtmlString MetaTags(this IApplicationService app, IMeta content, bool meta = true, bool opengraph = true, bool generator = true)
{
var sb = new StringBuilder();
if (meta)
{
// Generate meta tags
sb.AppendLine($"<meta name=\"robots\" content=\"{ MetaRobots(content) }\">");
if (!string.IsNullOrWhiteSpace(content.MetaKeywords))
{
sb.AppendLine($"<meta name=\"keywords\" content=\"{ content.MetaKeywords }\">");
}
if (!string.IsNullOrWhiteSpace(content.MetaDescription))
{
sb.AppendLine($"<meta name=\"description\" content=\"{ content.MetaDescription }\">");
}
}
if (generator)
{
// Generate generator tag
sb.AppendLine($"<meta name=\"generator\" content=\"Piranha CMS { Piranha.Utils.GetAssemblyVersion(typeof(Piranha.App).Assembly) }\">");
}
if (opengraph)
{
// Generate open graph tags
if (content is PageBase page && page.IsStartPage)
{
sb.AppendLine($"<meta property=\"og:type\" content=\"website\">");
}
else
{
sb.AppendLine($"<meta property=\"og:type\" content=\"article\">");
}
sb.AppendLine($"<meta property=\"og:title\" content=\"{ OgTitle(content) }\">");
if (content.OgImage != null && content.OgImage.HasValue)
{
sb.AppendLine($"<meta property=\"og:image\" content=\"{ app.AbsoluteContentUrl(content.OgImage) }\">");
}
else if (content is RoutedContentBase contentBase && contentBase.PrimaryImage != null && contentBase.PrimaryImage.HasValue)
{
// If there's no OG image specified but we have a primary image,
// default to the primary image.
sb.AppendLine($"<meta property=\"og:image\" content=\"{ app.AbsoluteContentUrl(contentBase.PrimaryImage) }\">");
}
if (!string.IsNullOrWhiteSpace(OgDescription(content)))
{
sb.AppendLine($"<meta property=\"og:description\" content=\"{ OgDescription(content) }\">");
}
}