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TokenRefresher.cs
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TokenRefresher.cs
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using System.Net.Http.Json;
using System.Text;
using Microsoft.Extensions.Options;
namespace Synk.Spotify;
public class TokenRefresher
{
private readonly HttpClient client = new();
private readonly Logger logger = new($"{nameof(TokenRefresher)}: ");
private const string TokenEndpoint = "https://accounts.spotify.com/api/token";
private readonly string clientId;
private readonly string authHeaderValue;
public TokenRefresher(IOptions<SpotifyConfiguration> options)
{
var configuration = options.Value;
clientId = configuration.ClientId;
authHeaderValue = Convert.ToBase64String(Encoding.Default.GetBytes($"{clientId}:{configuration.ClientSecret}"));
}
public async Task<Token?> RefreshTokenAsync(Token token)
{
logger.LogInfo("Refreshing token.");
var form = new Dictionary<string, string>
{
["grant_type"] = "refresh_token",
["refresh_token"] = token.RefreshToken,
["client_id"] = clientId,
};
var request = new HttpRequestMessage(HttpMethod.Post, TokenEndpoint)
{
Content = new FormUrlEncodedContent(form)
};
request.Headers.Authorization = new("Basic", authHeaderValue);
var response = await client.SendAsync(request);
if (!response.IsSuccessStatusCode)
{
logger.LogError($"Failed to refresh token. Response code was {response.StatusCode}.");
return null;
}
var newTokens = await response.Content.ReadFromJsonAsync<SpotifyTokenResponse>();
if (newTokens is null)
{
logger.LogError("Failed to refresh token. Response was empty or failed to deserialize body.");
return null;
}
logger.LogInfo("Token refreshed.");
return token with
{
AccessToken = newTokens.access_token,
RefreshToken = newTokens.refresh_token ?? token.RefreshToken
};
}
}
// Ignore naming rule violations for this public record. It makes deserializing the json simpler.
#pragma warning disable IDE1006 // Naming Styles
public record SpotifyTokenResponse(string access_token, string token_type, string scope, long expires_in, string? refresh_token);
#pragma warning restore IDE1006 // Naming Styles