CasTokenService.cs

using System.Net.Http;
using System.Threading.Tasks;
using Microsoft.Extensions.Options;
using Unity.GrantManager.Integrations;
using Unity.Modules.Shared.Integrations;
using Volo.Abp;
using Volo.Abp.Application.Services;
using Volo.Abp.Caching;
using Unity.GrantManager.Integrations.Css;

using Volo.Abp.DependencyInjection;
namespace Unity.Payments.Integrations.Cas
{
    [IntegrationService]
    [ExposeServices(typeof(CasTokenService), typeof(ICasTokenService))]

    public class CasTokenService(
        IEndpointManagementAppService endpointManagementAppService,
        IOptions<CasClientOptions> casClientOptions,
        IHttpClientFactory httpClientFactory,
        IDistributedCache<TokenValidationResponse, string> chesTokenCache
    ) : ApplicationService, ICasTokenService
    {
        private const string OAUTH_PATH = "oauth/token";
        private const string CAS_API_KEY = "CasApiKey";

        public async Task<string> GetAuthTokenAsync()
        {
            string caseBaseUrl = await endpointManagementAppService.GetUgmUrlByKeyNameAsync(DynamicUrlKeyNames.PAYMENT_API_BASE);
            ClientOptions clientOptions = new ClientOptions
            {
                Url = $"{caseBaseUrl}/{OAUTH_PATH}",
                ClientId = casClientOptions.Value.CasClientId,
                ClientSecret = casClientOptions.Value.CasClientSecret,
                ApiKey = CAS_API_KEY,
            };

            TokenService tokenService = new(httpClientFactory, chesTokenCache, Logger);
            return await tokenService.GetAuthTokenAsync(clientOptions);
        }
    }
}