var (
    // ErrUnauthorized is the error returned by Login when the request credentials
    // are invalid.
    ErrUnauthorized error = chattersvc.Unauthorized("invalid username and password combination")

    // ErrInvalidToken is the error returned when the JWT token is invalid.
    ErrInvalidToken error = chattersvc.Unauthorized("invalid token")

    // ErrInvalidScopes is the error returned when the scopes provided in
    // the JWT token claims are invalid.
    ErrInvalidTokenScopes error = chattersvc.InvalidScopes("invalid scopes in token")

    // Key is the key used in JWT authentication
    Key = []byte("secret")
)

func ChatterBasicAuth(ctx context.Context, user, pass string, s *security.BasicScheme) (context.Context, error)

func ChatterJWTAuth(ctx context.Context, token string, s *security.JWTScheme) (context.Context, error)

func NewChatter(logger *log.Logger) chattersvc.Service