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ClientParametersTagHelper.cs
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ClientParametersTagHelper.cs
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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
using Microsoft.AspNetCore.Razor.TagHelpers;
using System;
namespace Microsoft.AspNetCore.ApiAuthorization.IdentityServer
{
/// <summary>
/// A tag helper for generating client parameters for a given oauth/openid client as data attributes.
/// </summary>
[HtmlTargetElement("*", Attributes = "[asp-apiauth-parameters]")]
public class ClientParametersTagHelper : TagHelper
{
private readonly IClientRequestParametersProvider _clientRequestParametersProvider;
/// <summary>
/// Initializes a new instance of <see cref="ClientParametersTagHelper"/>.
/// </summary>
/// <param name="clientRequestParametersProvider">The <see cref="IClientRequestParametersProvider"/>.</param>
public ClientParametersTagHelper(IClientRequestParametersProvider clientRequestParametersProvider)
{
_clientRequestParametersProvider = clientRequestParametersProvider;
}
/// <summary>
/// Gets or sets the client id.
/// </summary>
[HtmlAttributeName("asp-apiauth-parameters")]
public string ClientId { get; set; }
/// <summary>
/// Gets or sets the ViewContext.
/// </summary>
[ViewContext]
public ViewContext ViewContext { get; set; }
/// <inheritdoc />
public override void Process(TagHelperContext context, TagHelperOutput output)
{
var parameters = _clientRequestParametersProvider.GetClientParameters(ViewContext.HttpContext, ClientId);
if (parameters == null)
{
throw new InvalidOperationException($"Parameters for client '{ClientId}' not found.");
}
foreach (var parameter in parameters)
{
output.Attributes.Add("data-" + parameter.Key, parameter.Value);
}
}
}
}