osr-discourse-src/app/assets/javascripts/discourse/components/user_search.js

(function() {
  var cache, cacheTime, cacheTopicId, debouncedSearch, doSearch;

  cache = {};

  cacheTopicId = null;

  cacheTime = null;

  doSearch = function(term, topicId, success) {
    return jQuery.ajax({
      url: '/users/search/users',
      dataType: 'JSON',
      data: {
        term: term,
        topic_id: topicId
      },
      success: function(r) {
        cache[term] = r;
        cacheTime = new Date();
        return success(r);
      }
    });
  };

  debouncedSearch = Discourse.debounce(doSearch, 200);

  window.Discourse.UserSearch = {
    search: function(options) {
      var callback, exclude, limit, success, term, topicId;
      term = options.term || "";
      callback = options.callback;
      exclude = options.exclude || [];
      topicId = options.topicId;
      limit = options.limit || 5;
      if (!callback) {
        throw "missing callback";
      }
      /*TODO site setting for allowed regex in username ?
      */

      if (term.match(/[^a-zA-Z0-9\_\.]/)) {
        callback([]);
        return true;
      }
      if ((new Date() - cacheTime) > 30000) {
        cache = {};
      }
      if (cacheTopicId !== topicId) {
        cache = {};
      }
      cacheTopicId = topicId;
      success = function(r) {
        var result;
        result = [];
        r.users.each(function(u) {
          if (exclude.indexOf(u.username) === -1) {
            result.push(u);
          }
          if (result.length > limit) {
            return false;
          }
          return true;
        });
        return callback(result);
      };
      if (cache[term]) {
        success(cache[term]);
      } else {
        debouncedSearch(term, topicId, success);
      }
      return true;
    }
  };

}).call(this);