/// <summary>
/// Requests a refresh token from the spotify web api.
/// </summary>
/// <param name="parameters">The authentication parameters.</param>
/// <param name="oldToken">The old token.</param>
/// <returns>A new refreshed token.</returns>
public static Token RefreshToken(AuthParameters parameters, Token oldToken)
{
if (string.IsNullOrEmpty(oldToken.RefreshToken))
{
throw new ValidationException("Refresh token was null or empty!");
}
var req = ApiHelper.CreateRequest(new Uri("https://accounts.spotify.com/api/token"));
var headers = new NameValueCollection
{
["Authorization"] = "Basic " + ApiHelper.Base64Encode($"{parameters.ClientId}:{parameters.ClientSecret}"),
};
req.Headers = new WebHeaderCollection
{
headers
};
var postData = "grant_type=refresh_token" +
$"&refresh_token={oldToken.RefreshToken}";
var data = Encoding.ASCII.GetBytes(postData);
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
req.ContentLength = data.Length;
using (var stream = req.GetRequestStream())
{
stream.Write(data, 0, data.Length);
}
var response = (HttpWebResponse)req.GetResponse();
// Get the stream containing content returned by the server.
var dataStream = response.GetResponseStream();
// Open the stream using a StreamReader for easy access.
var reader = new StreamReader(dataStream ?? throw new InvalidOperationException());
// Read the content.
var json = reader.ReadToEnd();
var newToken = JsonConvert.DeserializeObject <Token>(json);
newToken.RefreshToken = oldToken.RefreshToken;
newToken.AuthenticationType = TokenAuthenticationType.AuthorizationCode;
return(newToken);
}
/// <summary>
/// Processes the callback and returns the <see cref="Token"/>.
/// </summary>
/// <param name="parameters">The parameters used in <see cref="GetUrl"/>.</param>
/// <param name="code">The retrieved code.</param>
/// <param name="error">The retrieved error.</param>
/// <returns>The new token.</returns>
public static Token ProcessCallback(AuthParameters parameters, string code, string error = "")
{
var req = ApiHelper.CreateRequest(new Uri("https://accounts.spotify.com/api/token"));
var headers = new NameValueCollection
{
["Authorization"] = "Basic " + ApiHelper.Base64Encode($"{parameters.ClientId}:{parameters.ClientSecret}"),
};
req.Headers = new WebHeaderCollection
{
headers
};
var postData = "grant_type=authorization_code" +
$"&code={code}" +
$"&redirect_uri={parameters.RedirectUri}";
var data = Encoding.ASCII.GetBytes(postData);
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
req.ContentLength = data.Length;
using (var stream = req.GetRequestStream())
{
stream.Write(data, 0, data.Length);
}
using var response = (HttpWebResponse)req.GetResponse();
// Get the stream containing content returned by the server.
var dataStream = response.GetResponseStream();
// Open the stream using a StreamReader for easy access.
var reader = new StreamReader(dataStream ?? throw new InvalidOperationException());
// Read the content.
var json = reader.ReadToEnd();
var result = JsonConvert.DeserializeObject <Token>(json);
result.AuthenticationType = TokenAuthenticationType.AuthorizationCode;
return(result);
}
/// <summary>
/// Retrieves the authentication url for authenticating with the spotify web api.
/// </summary>
/// <param name="parameters">The <see cref="AuthParameters"/> to use while creating the url.</param>
/// <param name="state">The state to use while creating the url.
/// For more info see 'https://developer.spotify.com/web-api/authorization-guide/#implicit_grant_flow'</param>
/// <returns>The url that the user can use to authenticate this application.</returns>
public static string GetUrl(AuthParameters parameters, string state)
{
var scopes = string.Join(
" ",
parameters.Scopes.ToString()
.Split(new[] { ", " }, StringSplitOptions.None)
.Select(i => (int)Enum.Parse(parameters.Scopes.GetType(), i))
.Cast <Scope>()
.Select(x => x.AsString())
.ToList());
return($"https://accounts.spotify.com/authorize/?" +
$"client_id={parameters.ClientId}" +
$"&response_type=token" +
$"&redirect_uri={parameters.RedirectUri}" +
$"&scope={scopes}" +
$"&state={state}" +
$"&show_dialog={(parameters.ShowDialog ? "true" : "false")}");
}
/// <summary>
/// Retrieves a valid token from the Spotify web api.
/// </summary>
/// <param name="parameters">The <see cref="AuthParameters"/> used for this token.</param>
/// <returns>A valid <see cref="Token"/>.</returns>
public static Token GetToken(AuthParameters parameters)
{
var req = ApiHelper.CreateRequest(new Uri("https://accounts.spotify.com/api/token"));
var headers = new NameValueCollection
{
["Authorization"] = "Basic " + ApiHelper.Base64Encode($"{parameters.ClientId}:{parameters.ClientSecret}"),
};
req.Headers = new WebHeaderCollection
{
headers
};
var data = Encoding.ASCII.GetBytes("grant_type=client_credentials");
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
req.ContentLength = data.Length;
using (var stream = req.GetRequestStream())
{
stream.Write(data, 0, data.Length);
}
var response = (HttpWebResponse)req.GetResponse();
// Get the stream containing content returned by the server.
var dataStream = response.GetResponseStream();
// Open the stream using a StreamReader for easy access.
var reader = new StreamReader(dataStream ?? throw new InvalidOperationException());
// Read the content.
var json = reader.ReadToEnd();
var token = JsonConvert.DeserializeObject <Token>(json);
token.CanAccessPersonalData = false;
token.AuthenticationType = TokenAuthenticationType.ClientCredentials;
return(token);
}
