StructuredData.razor

@using System.Text.Json
@using System.Text.Json.Serialization

<script suppress-error="BL9992" type="application/ld+json">@StructuredDataJson</script>

@code {
	[Parameter, EditorRequired]
	public required string Headline { get; set; }

	[Parameter, EditorRequired]
	public required string PreviewImage { get; set; }

	[Parameter]
	public string? PreviewFallbackImage { get; set; }

	[Parameter, EditorRequired]
	public DateTime PublishedDate { get; set; }

	[Parameter, EditorRequired]
	public required string Author { get; set; }

	private MarkupString StructuredDataJson { get; set; }

	private readonly JsonSerializerOptions jsonOptions = new() { WriteIndented = true };

	protected override async Task OnParametersSetAsync()
	{
		var article = new NewsArticle
		{
			Context = "https://schema.org",
			Type = "NewsArticle",
			Headline = Headline,
			Author = Author,
			Image = [PreviewImage],
			DatePublished = PublishedDate.ToString("o"),
			DateModified = PublishedDate.ToString("o")
		};

		if (!string.IsNullOrWhiteSpace(PreviewFallbackImage))
		{
			article.Image.Add(PreviewFallbackImage);
		}

		StructuredDataJson = (MarkupString)JsonSerializer.Serialize(article, jsonOptions);

		await base.OnParametersSetAsync();
	}

	private sealed class NewsArticle
	{
		[JsonPropertyName("@context")]
		public required string Context { get; set; }

		[JsonPropertyName("@type")]
		public required string Type { get; set; }

		[JsonPropertyName("headline")]
		public required string Headline { get; set; }

		[JsonPropertyName("author")]
		public required string Author { get; set; }

		[JsonPropertyName("image")]
		public List<string> Image { get; set; } = [];

		[JsonPropertyName("datePublished")]
		public required string DatePublished { get; set; }

		[JsonPropertyName("dateModified")]
		public required string DateModified { get; set; }
	}
}