/// <summary>
/// This method initialize the meta tags properties definition for current initial state of the current page.
/// </summary>
/// <param name="model"></param>
/// <param name="disableDefaultDecoratedTags">Disable default decorated meta tags for the parent controller.</param>
/// <returns></returns>
protected virtual async Task <MetaTagsModel> InitializeMetaTagsAsync(InitialStateModel <TViewModel> model, bool disableDefaultDecoratedTags = false)
{
try
{
var seoOptionsAccessor = (IOptions <DefinuxSeoOptions>) this.HttpContext.RequestServices.GetService(typeof(IOptions <DefinuxSeoOptions>));
var seoOptions = seoOptionsAccessor?.Value;
var metaTagsModel = this.ViewData.GetMetaTagsModelOrDefault();
if (metaTagsModel == null)
{
metaTagsModel = new MetaTagsModel();
}
metaTagsModel.ApplyStaticTags(seoOptions.DefaultMetaTags);
metaTagsModel.OpenGraphImage.Value = seoOptions.DefaultMetaTags.OpenGraphImage.Value;
metaTagsModel.TwitterImage.Value = seoOptions.DefaultMetaTags.TwitterImage.Value;
if (!disableDefaultDecoratedTags)
{
string pageKey = StringFunctions.ConvertToKey(this.GetType().Name);
this.AddTranslatedValueIntoViewData(EmPagesConstants.PageMetaTagTitleKey, $"{pageKey}_META_TITLE");
this.AddTranslatedValueIntoViewData(EmPagesConstants.PageMetaTagDescriptionKey, $"{pageKey}_META_DESCRIPTION");
}
return(metaTagsModel);
}
catch (Exception ex)
{
await this.Logger.LogErrorAsync(ex);
return(new MetaTagsModel());
}
}
/// <summary>
/// Gets or creates <see cref="MetaTagsModel"/> into the ViewData.
/// </summary>
/// <param name="viewData"></param>
/// <returns></returns>
public static MetaTagsModel GetOrCreateCurrentMetaTagsModel(this ViewDataDictionary viewData)
{
MetaTagsModel result = new MetaTagsModel();
try
{
if (viewData.ContainsKey(ViewDataMetaTagsModelKey) && viewData[ViewDataMetaTagsModelKey] != null)
{
result = (MetaTagsModel)viewData[ViewDataMetaTagsModelKey];
}
}
catch (Exception)
{
result = new MetaTagsModel();
}
finally
{
viewData[ViewDataMetaTagsModelKey] = result;
}
return(result);
}
protected override void InnerProcess(ref TagHelperContext context, ref TagHelperOutput output)
{
this.ValidateTagHelperAttributesExistence();
output.TagName = this.OutputTagName;
output.TagMode = TagMode.StartTagAndEndTag;
(this.HtmlHelper as IViewContextAware)?.Contextualize(this.ViewContext);
string baseUrl = $"{this.ViewContext.HttpContext.Request.Scheme}://{this.ViewContext.HttpContext.Request.Host}";
string queryString = this.ViewContext.HttpContext.Request.QueryString.HasValue ? this.ViewContext.HttpContext.Request.QueryString.Value : string.Empty;
string currentUrl = $"{baseUrl}{this.ViewContext.HttpContext.Request.Path}{queryString}";
MetaTagsModel model = new MetaTagsModel();
model.SetTitle(this.Title);
model.SetDescription(this.Description);
if (!string.IsNullOrWhiteSpace(this.Image))
{
model.SetImage($"{baseUrl}/{this.Image}");
}
model.Keywords = this.Keywords;
model.OpenGraphUrl = currentUrl;
model.Canonical = currentUrl;
model.OpenGraphSiteName = this.configuration?["MetaTags:OpenGraphSiteName"];
model.OpenGraphType = this.configuration?["MetaTags:OpenGraphType"];
model.FacebookAppId = this.configuration?["MetaTags:FacebookAppId"];
model.TwitterCard = this.configuration?["MetaTags:TwitterCard"];
model.TwitterCreator = this.configuration?["MetaTags:TwitterCreator"];
model.TwitterSite = this.configuration?["MetaTags:TwitterSite"];
Task <IHtmlContent> htmlContentTask = this.HtmlHelper.PartialAsync(this.PartialPath, model);
htmlContentTask.Wait();
output.Content.SetHtmlContent(htmlContentTask.Result);
}
/// <summary>
/// Apply specified <see cref="MetaTagsModel"/> to the ViewData.
/// </summary>
/// <param name="viewData"></param>
/// <param name="model"></param>
public static void ApplyMetaTagsModel(this ViewDataDictionary viewData, MetaTagsModel model)
{
viewData[ViewDataMetaTagsModelKey] = model;
}
/// <summary>
/// Initializes a new instance of the <see cref="SeoMetaTagsTagHelper"/> class.
/// </summary>
/// <param name="optionsAccessor"></param>
public SeoMetaTagsTagHelper(IOptions <DefinuxSeoOptions> optionsAccessor)
{
this.defaultMetaTagsModel = optionsAccessor.Value.DefaultMetaTags;
}
