Spotify.NET/SpotifyAPI.Web/Http/Authenticators/CredentialsAuthenticator.cs

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using System.Threading.Tasks;
namespace SpotifyAPI.Web.Http
{
/// <summary>
/// This Authenticator requests new credentials token on demand and stores them into memory.
/// It is unable to query user specifc details.
/// </summary>
public class CredentialsAuthenticator : IAuthenticator
{
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private CredentialsTokenResponse? _token;
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/// <summary>
/// Initiate a new instance. The first token will be fetched when the first API call occurs
/// </summary>
/// <param name="clientId">
/// The ClientID, defined in a spotify application in your Spotify Developer Dashboard
/// </param>
/// <param name="clientSecret">
/// The ClientID, defined in a spotify application in your Spotify Developer Dashboard
/// </param>
public CredentialsAuthenticator(string clientId, string clientSecret)
{
Ensure.ArgumentNotNullOrEmptyString(clientId, nameof(clientId));
Ensure.ArgumentNotNullOrEmptyString(clientSecret, nameof(clientSecret));
ClientId = clientId;
ClientSecret = clientSecret;
}
/// <summary>
/// The ClientID, defined in a spotify application in your Spotify Developer Dashboard
/// </summary>
public string ClientId { get; }
/// <summary>
/// The ClientID, defined in a spotify application in your Spotify Developer Dashboard
/// </summary>
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public string ClientSecret { get; }
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public async Task Apply(IRequest request, IAPIConnector apiConnector)
{
Ensure.ArgumentNotNull(request, nameof(request));
if (_token == null || _token.IsExpired)
{
var tokenRequest = new ClientCredentialsRequest(ClientId, ClientSecret);
_token = await OAuthClient.RequestToken(tokenRequest, apiConnector).ConfigureAwait(false);
}
request.Headers["Authorization"] = $"{_token.TokenType} {_token.AccessToken}";
}
}
}