Microsoft 标识平台和 OAuth 2.0 代理流

参考：Microsoft 标识平台和 OAuth 2.0 代理流 https://learn.microsoft.com/ZH-CN/entra/identity-platform/v2-oauth2-on-behalf-of-flow
  /// <summary>
        /// 获取B数据
        /// </summary>
        /// <returns></returns>
        public async Task<RestResponse> GetEmdData()
        {

            var tokenResponse = await GetToEMDToken();

            string url = MaintenanceConsts.GETEMDDATAURL;
            string token = tokenResponse.AccessToken;
            var client = new RestClient(_emdBaseUrl);
            var request = new RestRequest(url);
            request.AddHeader("Authorization", "Bearer " + token);
            var response = await client.GetAsync(request);
            return response;
        }

        /// <summary>
        /// 获取访问B的token
        /// </summary>
        /// <returns></returns> 
        private async Task<TokenResponse> GetToEMDToken()
        {
            try
            {
                var authorization = _httpContextAccessor.HttpContext.Request.Headers["Authorization"];
                var accessToken = authorization.Any() ? authorization.ToString() : "";
                string baseUrl = _instance + _tenantId + "/";


                string assertion = accessToken?.Replace("Bearer ", "");

                var options = new RestClientOptions(baseUrl);
                using var client = new RestClient(options);
                var request = new RestRequest(MaintenanceConsts.GETEMDTOKENURL)
                .AddHeader("Content-Type", MaintenanceConsts.CONTENTTYPE)
                .AddParameter("grant_type", MaintenanceConsts.GRANTTYPE)
                .AddParameter("client_id", _clientId)
                .AddParameter("client_secret", _clientSecret)
                .AddParameter("assertion", assertion)
                .AddParameter("scope", _emdScope)
                .AddParameter("requested_token_use", MaintenanceConsts.REQUESTEDTOKENUSE);
                var response = await client.PostAsync<TokenResponse>(request);

                return response;
            }
            catch (Exception ex)
            {
                _logger.LogError(ex.Message);
                _logger.LogError(ex.ToString());
                throw;
            }



        }