带有 RestSharp 的 Paypal Rest Api 在 xamarin android 中不起作用

Posted 2023-02-22

【中文标题】带有 RestSharp 的 Paypal Rest Api 在 xamarin android 中不起作用

【英文标题】：Paypal Rest Api With RestSharp not working in xamarin android

【发布时间】：2017-01-26 19:52:21

【问题描述】：

当我调用 Paypal Rest API 时，RestSharp 组件出现错误。

我有以下代码使用 Xamarin for android。

    public async Task<PayPalGetTokenResponse> GetAccessToken()
    
        var restRequest = new RestRequest("/oauth2/token", Method.POST);
        // Add headers
        restRequest.AddHeader("Accept", "application/json");
        restRequest.AddHeader("Accept-Language", "en_US");

        // Make Authorization header
        restClient.Authenticator = new HttpBasicAuthenticator(Config.ApiClientId, Config.ApiSecret);

        // add data to send
        restRequest.AddParameter("grant_type", "client_credentials");

        var response = restClient.Execute<PayPalGetTokenResponse>(restRequest);

        response.Data.DisplayError = CheckResponseStatus(response, HttpStatusCode.OK);

        return response.Data;
    

但报错：“Error: SecureChannelFailure (验证或解密失败。)”

我也使用了 ModernHttpClient 但遇到了同样的错误

 public async Task<PayPalGetTokenResponse> GetAccessToken()
          
        string clientId = Config.ApiClientId;
        string secret = Config.ApiSecret;
        string oAuthCredentials =      Convert.ToBase64String(Encoding.Default.GetBytes(clientId + ":" + secret));
        string uriString = Config.ApiUrl+"/oauth2/token";
        PayPalGetTokenResponse result;

        HttpClient client = new HttpClient(new NativeMessageHandler());
        var h_request = new HttpRequestMessage(HttpMethod.Post, uriString);
        h_request.Headers.Authorization = new AuthenticationHeaderValue("Basic", oAuthCredentials);
        h_request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
        h_request.Headers.AcceptLanguage.Add(new StringWithQualityHeaderValue("en_US"));
        h_request.Content = new StringContent("grant_type=client_credentials", UTF8Encoding.UTF8);
        try
        

            HttpResponseMessage response = await client.SendAsync(h_request);
            //if call failed ErrorResponse created...simple class with response properties
            if (!response.IsSuccessStatusCode)
            
                var error = await response.Content.ReadAsStringAsync();
                var errResp = JsonConvert.DeserializeObject<string>(error);
                //throw new PayPalException  error_name = errResp.name, details = errResp.details, message = errResp.message ;
            
            var success = await response.Content.ReadAsStringAsync();
            result = JsonConvert.DeserializeObject<PayPalGetTokenResponse>(success);
        
        catch (Exception)
        
            throw new HttpRequestException("Request to PayPal Service failed.");
        
        return result;
    

【问题讨论】：

RestSharp 使用的 HttpClient 换成 ModernHttpClient 了吗？

是的，但遇到同样的错误

你试过这里的例子吗：***.com/a/17234955/1398425

但是，这会抑制存在潜在风险的 SSL 问题。

感谢您的回复，我也提出了：ServicePointManager.ServerCertificateValidationCallback += (sender, certificate, chain, sslPolicyErrors) => true;在主要活动中但遇到相同的错误

【参考方案1】：

您是否尝试强制使用现代 SSL 协议？

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

这对我有用：

if (ServicePointManager.SecurityProtocol != SecurityProtocolType.Tls12)
    ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12; 

var client = new RestClient(payPalURL)  
    Encoding = Encoding.UTF8 
;
var authRequest = new RestRequest("oauth2/token", Method.POST) 
    RequestFormat = DataFormat.Json
;
client.Authenticator = new HttpBasicAuthenticator(clientId, secret);
authRequest.AddParameter("grant_type","client_credentials");
var authResponse = client.Execute(authRequest);