/
EncoderServiceCollectionExtensions.cs
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/
EncoderServiceCollectionExtensions.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
using System.Text.Encodings.Web;
using Microsoft.AspNetCore.Shared;
using Microsoft.Extensions.DependencyInjection.Extensions;
using Microsoft.Extensions.Options;
using Microsoft.Extensions.WebEncoders;
namespace Microsoft.Extensions.DependencyInjection;
/// <summary>
/// Extension methods for setting up web encoding services in an <see cref="IServiceCollection" />.
/// </summary>
public static class EncoderServiceCollectionExtensions
{
/// <summary>
/// Adds <see cref="HtmlEncoder"/>, <see cref="JavaScriptEncoder"/> and <see cref="UrlEncoder"/>
/// to the specified <paramref name="services" />.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection"/>.</param>
/// <returns>The <see cref="IServiceCollection"/> so that additional calls can be chained.</returns>
public static IServiceCollection AddWebEncoders(this IServiceCollection services)
{
ArgumentNullThrowHelper.ThrowIfNull(services);
services.AddOptions();
// Register the default encoders
// We want to call the 'Default' property getters lazily since they perform static caching
services.TryAddSingleton(
CreateFactory(() => HtmlEncoder.Default, HtmlEncoder.Create));
services.TryAddSingleton(
CreateFactory(() => JavaScriptEncoder.Default, JavaScriptEncoder.Create));
services.TryAddSingleton(
CreateFactory(() => UrlEncoder.Default, UrlEncoder.Create));
return services;
}
/// <summary>
/// Adds <see cref="HtmlEncoder"/>, <see cref="JavaScriptEncoder"/> and <see cref="UrlEncoder"/>
/// to the specified <paramref name="services" />.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection"/>.</param>
/// <param name="setupAction">An <see cref="Action{WebEncoderOptions}"/> to configure the provided <see cref="WebEncoderOptions"/>.</param>
/// <returns>The <see cref="IServiceCollection"/> so that additional calls can be chained.</returns>
public static IServiceCollection AddWebEncoders(this IServiceCollection services, Action<WebEncoderOptions> setupAction)
{
ArgumentNullThrowHelper.ThrowIfNull(services);
ArgumentNullThrowHelper.ThrowIfNull(setupAction);
services.AddWebEncoders();
services.Configure(setupAction);
return services;
}
private static Func<IServiceProvider, TService> CreateFactory<TService>(
Func<TService> defaultFactory,
Func<TextEncoderSettings, TService> customSettingsFactory)
{
return serviceProvider =>
{
var settings = serviceProvider
?.GetService<IOptions<WebEncoderOptions>>()
?.Value
?.TextEncoderSettings;
return (settings != null) ? customSettingsFactory(settings) : defaultFactory();
};
}
}