我试图用C#调用spotify API.
不幸的是,我已经陷入了获取访问令牌的困境
不幸的是,我已经陷入了获取访问令牌的困境
这就是我试图得到它的方式：
private static async Task<string> GetAccessToken()
{
SpotifyToken token = new SpotifyToken();
string postString = string.Format("grant_type=client_credentials");
byte[] byteArray = Encoding.UTF8.GetBytes(postString);
string url = "https://accounts.spotify.com/api/token";
WebRequest request = WebRequest.Create(url);
request.Method = "POST";
request.Headers.Add("Authorization","Basic {Encoded myClientIdXXX:myAppSecretYYY}");
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = byteArray.Length;
using (Stream dataStream = request.GetRequestStream())
{
dataStream.Write(byteArray,byteArray.Length);
using (WebResponse response = await request.GetResponseAsync())
{
using (Stream responseStream = response.GetResponseStream())
{
using (StreamReader reader = new StreamReader(responseStream))
{
string responseFromServer = reader.ReadToEnd();
token = JsonConvert.DeserializeObject<SpotifyToken>(responseFromServer);
}
}
}
}
return token.access_token;
}
但是我收到一个错误：
Der Remoteserver hat einen Fehler zurückgegeben: (400) Ungültige Anforderung.
这意味着：
The remote server returned an error: (400) Bad Request.
我在这做错了什么？
我在spotify上注册了我的应用程序,并在请求标题中设置了clientId和secret …
提前致谢
解决方法
您是否真的需要从头开始编写自己的客户端来构建WebRequests等？为什么不使用像
SpotifyAPI-NET这样的现有客户端？
无论如何,你可以在GitHub上看到他们是如何做到的：
using Newtonsoft.Json;
using SpotifyAPI.Web.Enums;
using SpotifyAPI.Web.Models;
using System;
using System.Collections.Specialized;
using System.Diagnostics;
using System.IO;
using System.Net;
using System.Text;
using System.Threading;
namespace SpotifyAPI.Web.Auth
{
public class AutorizationCodeAuth
{
public delegate void OnResponseReceived(AutorizationCodeAuthResponse response);
private SimpleHttpServer _httpServer;
private Thread _httpThread;
public String ClientId { get; set; }
public String RedirectUri { get; set; }
public String State { get; set; }
public Scope Scope { get; set; }
public Boolean ShowDialog { get; set; }
/// <summary>
/// Will be fired once the user authenticated
/// </summary>
public event OnResponseReceived OnResponseReceivedEvent;
/// <summary>
/// Start the auth process (Make sure the internal HTTP-Server ist started)
/// </summary>
public void DoAuth()
{
String uri = GetUri();
Process.Start(uri);
}
/// <summary>
/// Refreshes auth by providing the clientsecret (Don't use this if you're on a client)
/// </summary>
/// <param name="refreshToken">The refresh-token of the earlier gathered token</param>
/// <param name="clientSecret">Your Client-Secret,don't provide it if this is running on a client!</param>
public Token RefreshToken(string refreshToken,string clientSecret)
{
using (WebClient wc = new WebClient())
{
wc.Proxy = null;
wc.Headers.Add("Authorization","Basic " + Convert.ToBase64String(Encoding.UTF8.GetBytes(ClientId + ":" + clientSecret)));
NameValueCollection col = new NameValueCollection
{
{"grant_type","refresh_token"},{"refresh_token",refreshToken}
};
String response;
try
{
byte[] data = wc.UploadValues("https://accounts.spotify.com/api/token","POST",col);
response = Encoding.UTF8.GetString(data);
}
catch (WebException e)
{
using (StreamReader reader = new StreamReader(e.Response.GetResponseStream()))
{
response = reader.ReadToEnd();
}
}
return JsonConvert.DeserializeObject<Token>(response);
}
}
private String GetUri()
{
StringBuilder builder = new StringBuilder("https://accounts.spotify.com/authorize/?");
builder.Append("client_id=" + ClientId);
builder.Append("&response_type=code");
builder.Append("&redirect_uri=" + RedirectUri);
builder.Append("&state=" + State);
builder.Append("&scope=" + Scope.GetStringAttribute(" "));
builder.Append("&show_dialog=" + ShowDialog);
return builder.ToString();
}
/// <summary>
/// Start the internal HTTP-Server
/// </summary>
public void StartHttpServer(int port = 80)
{
_httpServer = new SimpleHttpServer(port,AuthType.Authorization);
_httpServer.OnAuth += HttpServerOnOnAuth;
_httpThread = new Thread(_httpServer.Listen);
_httpThread.Start();
}
private void HttpServerOnOnAuth(AuthEventArgs e)
{
OnResponseReceivedEvent?.Invoke(new AutorizationCodeAuthResponse()
{
Code = e.Code,State = e.State,Error = e.Error
});
}
/// <summary>
/// This will stop the internal HTTP-Server (Should be called after you got the Token)
/// </summary>
public void StopHttpServer()
{
_httpServer = null;
}
/// <summary>
/// Exchange a code for a Token (Don't use this if you're on a client)
/// </summary>
/// <param name="code">The gathered code from the response</param>
/// <param name="clientSecret">Your Client-Secret,don't provide it if this is running on a client!</param>
/// <returns></returns>
public Token ExchangeAuthCode(String code,String clientSecret)
{
using (WebClient wc = new WebClient())
{
wc.Proxy = null;
NameValueCollection col = new NameValueCollection
{
{"grant_type","authorization_code"},{"code",code},{"redirect_uri",RedirectUri},{"client_id",ClientId},{"client_secret",clientSecret}
};
String response;
try
{
byte[] data = wc.UploadValues("https://accounts.spotify.com/api/token",col);
response = Encoding.UTF8.GetString(data);
}
catch (WebException e)
{
using (StreamReader reader = new StreamReader(e.Response.GetResponseStream()))
{
response = reader.ReadToEnd();
}
}
return JsonConvert.DeserializeObject<Token>(response);
}
}
}
public struct AutorizationCodeAuthResponse
{
public String Code { get; set; }
public String State { get; set; }
public String Error { get; set; }
}
}
