private static void SaveCredentials(OAuth2Credentials credentials, OAuth2App app)
{
using (var writer = new StreamWriter(app.CredentialsCachePath))
{
var serializer = new JsonSerializer();
serializer.Serialize(writer, credentials);
}
}
private static OAuth2Credentials LoadCredentials(OAuth2App app)
{
if (!File.Exists(app.CredentialsCachePath))
{
return(null);
}
return(JsonConvert.DeserializeObject <OAuth2Credentials>(
File.ReadAllText(app.CredentialsCachePath)));
}
internal static async Task <OAuth2Credentials> AuthorizeAsync(OAuth2App app, OAuth2EndPoint endPoint)
{
var credentials = LoadCredentials(app);
if (credentials?.AccessToken == null)
{
var server = StartRedirectServer(app.RedirectUri).ConfigureAwait(false);
var authUri = $"{endPoint.BaseUri.TrimEnd('/')}/{endPoint.AuthResource.TrimStart('/')}?response_type=code&client_id={app.ClientId}";
Process.Start(authUri);
var code = await server;
credentials = await GetCredentialsAsync(code, app, endPoint).ConfigureAwait(false);
SaveCredentials(credentials, app);
}
else if (credentials.Expires < DateTime.Now)
{
credentials = await UpdateCredentialsAsync(credentials, app, endPoint).ConfigureAwait(false);
}
return(credentials);
}
private protected async Task AuthorizeAsync(OAuth2App app, OAuth2EndPoint endPoint)
{
_app = app;
_endPoint = endPoint;
_credentials = await OAuth2Broker.AuthorizeAsync(app, endPoint).ConfigureAwait(false);
}
public abstract Task AuthorizeAsync(OAuth2App app);
internal static async Task <OAuth2Credentials> UpdateCredentialsAsync(OAuth2Credentials credentials, OAuth2App app, OAuth2EndPoint endPoint)
{
if (credentials?.AccessToken != null && DateTime.Now < credentials.Expires)
{
return(credentials);
}
var client = new RestClient(endPoint.BaseUri.TrimEnd('/') + '/');
var tokenRequest = new RestRequest(endPoint.QueryTokenResource, Method.POST, DataFormat.FormUrlEncoded);
tokenRequest.AddParameter("grant_type", "refresh_token");
tokenRequest.AddParameter("client_id", app.ClientId);
tokenRequest.AddParameter("client_secret", app.ClientSecret);
tokenRequest.AddParameter("refresh_token", credentials.RefreshToken);
var(response, _) = await client.SendAsync(tokenRequest).ConfigureAwait(false);
var result = await response.DeserializeContentAsync <_QueryTokenResult>().ConfigureAwait(false);
credentials = new OAuth2Credentials()
{
AccessToken = result.access_token,
RefreshToken = result.refresh_token,
Expires = DateTime.Now + TimeSpan.FromSeconds(result.expires_in),
};
SaveCredentials(credentials, app);
return(credentials);
}
private static async Task <OAuth2Credentials> GetCredentialsAsync(string code, OAuth2App app, OAuth2EndPoint endPoint)
{
var client = new RestClient(endPoint.BaseUri);
var tokenRequest = new RestRequest(endPoint.QueryTokenResource, Method.POST, DataFormat.FormUrlEncoded);
tokenRequest.AddParameter("grant_type", "authorization_code");
tokenRequest.AddParameter("code", code);
tokenRequest.AddParameter("client_id", app.ClientId);
tokenRequest.AddParameter("client_secret", app.ClientSecret);
var(response, _) = await client.SendAsync(tokenRequest).ConfigureAwait(false);
var result = await response.DeserializeContentAsync <_QueryTokenResult>().ConfigureAwait(false);
return(new OAuth2Credentials()
{
AccessToken = result.access_token,
RefreshToken = result.refresh_token,
Expires = DateTime.Now + TimeSpan.FromSeconds(result.expires_in),
});
}