oauth3.discover = function (providerUri, opts) {
    opts = opts || {};

    console.log('DEBUG oauth3.discover', providerUri);
    console.log(opts);
    if (opts.directives) {
      return oauth3.PromiseA.resolve(opts.directives);
    }

    var promise;
    var promise2;
    var directives;
    var updatedAt;
    var fresh;

    providerUri = oauth3.normalizeUrl(providerUri);
    try {
      directives = JSON.parse(localStorage.getItem('oauth3.' + providerUri + '.directives'));
      console.log('DEBUG oauth3.discover cache', directives);
      updatedAt = localStorage.getItem('oauth3.' + providerUri + '.directives.updated_at');
      console.log('DEBUG oauth3.discover updatedAt', updatedAt);
      updatedAt = new Date(updatedAt).valueOf();
      console.log('DEBUG oauth3.discover updatedAt', updatedAt);
    } catch(e) {
      // ignore
    }

    fresh = (Date.now() - updatedAt) < (24 * 60 * 60 * 1000);

    if (directives) {
      promise = oauth3.PromiseA.resolve(directives);

      if (fresh) {
        //console.log('[local] [fresh directives]', directives);
        return promise;
      }
    }

    promise2 = oauth3._discoverHelper(providerUri, opts);

    return promise || promise2;
  };