76 lines
2.4 KiB
C#
76 lines
2.4 KiB
C#
using System;
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using System.Collections.Generic;
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using FluentValidation;
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using Gallium;
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using HandlebarsDotNet;
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using Nitride.Contents;
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namespace Nitride.Handlebars;
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/// <summary>
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/// An operation that uses the content to create a template that is then
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/// applied against the content and metadata and then replaces the content
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/// of that entity.
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/// </summary>
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public class RenderContentTemplate<TModel> : OperationBase
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{
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private readonly HandlebarsTemplateCache cache;
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// TODO: This does not use [WithProperties] because the source generator hasn't been taught how to do generics.
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private readonly IValidator<RenderContentTemplate<TModel>> validator;
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public RenderContentTemplate(IValidator<RenderContentTemplate<TModel>> validator, HandlebarsTemplateCache cache)
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{
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this.validator = validator;
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this.cache = cache;
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}
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/// <summary>
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/// Gets or sets the callback used to create a model from a given
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/// entity. This allows for the website to customize what information is
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/// being passed to the template.
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/// </summary>
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public Func<Entity, TModel>? CreateModelCallback { get; set; }
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/// <inheritdoc />
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public override IEnumerable<Entity> Run(IEnumerable<Entity> input)
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{
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this.validator.ValidateAndThrow(this);
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return input.ForEachEntity<HasHandlebarsTemplate, ITextContent>(this.Apply);
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}
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/// <summary>
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/// Sets the callback for the template and returns the operation to
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/// chain operations.
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/// </summary>
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/// <param name="callback">The callback to set.</param>
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/// <returns>The ApplyContentHandlebarsTemplate to chain requests.</returns>
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public RenderContentTemplate<TModel> WithCreateModelCallback(Func<Entity, TModel>? callback)
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{
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this.CreateModelCallback = callback;
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return this;
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}
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private Entity Apply(Entity entity, HasHandlebarsTemplate _, ITextContent content)
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{
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// Create the model using the callback.
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TModel model = this.CreateModelCallback!(entity);
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// Create a template from the contents.
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string text = content.GetText();
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HandlebarsTemplate<object, object> template = this.cache.GetLiteralTemplate(text);
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// Render the template and create a new entity with the updated
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// text.
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string result = template(model!);
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return entity.Remove<HasHandlebarsTemplate>().SetTextContent(new StringTextContent(result));
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}
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}
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