wx/lib/wx_client.js

W(ei)X(in) -- (minimalist) WeChat Middleware for Express.js

// Generated by CoffeeScript 1.10.0
(function() {
  var $,
    slice = [].slice;

  $ = jQuery;

  $.fn.scan = function(handler, options) {
    if (!arguments.length) {
      return this.trigger('scan');
    }
    return this.each(function() {
      var continuous, error, expires, img, load, msg_ids, new_src, src;
      msg_ids = {};
      if (!(src = $(this).attr('src'))) {
        return;
      }
      continuous = $(this).attr('continuous') != null;
      img = this;
      expires = 1800 * 1000;
      $(this).on('scan', null, null, function() {
        var args, event;
        event = arguments[0], args = 2 <= arguments.length ? slice.call(arguments, 1) : [];
        return handler != null ? handler.apply(img, args) : void 0;
      });
      new_src = function() {
        var w_query;
        w_query = src.indexOf('?') !== -1;
        return "" + src + (w_query ? '&' : '?') + "t=" + (Date.now());
      };
      load = function() {
        var permanent, polling, refresh;
        $(img).show();
        (polling = (function(_this) {
          return function() {
            var timeout;
            if (!$(img).is(':visible')) {
              return;
            }
            timeout = setTimeout(polling, 25000);
            return (function() {
              var scan_url, start;
              start = Date.now();
              scan_url = encodeURI(decodeURI(src.replace(/(.*)(\/qrcode)($|((\?|\/).*))/i, '$1/scan$3')));
              scan_url = scan_url.indexOf('?') !== -1 ? scan_url + ("&t=" + (Date.now())) : scan_url + ("?t=" + (Date.now()));
              return $.ajax({
                url: scan_url,
                xhrFields: {
                  withCredentials: true
                }
              }).success(function(params) {
                var msg_id, ref;
                clearTimeout(timeout);
                $(img).addClass('scanned');
                ref = params, msg_id = ref[0], params = 2 <= ref.length ? slice.call(ref, 1) : [];
                if (msg_ids[msg_id]) {
                  return;
                }
                msg_ids[msg_id] = 1;
                if (handler != null) {
                  handler.apply(img, params);
                }
                if (continuous) {
                  return polling();
                }
              }).fail(function(xhr, status) {
                if (xhr.status === 404) {
                  return;
                }
                clearTimeout(timeout);
                return polling();
              });
            })();
          };
        })(this))();
        if (permanent = src.match(/\/qrcode\/\d+(\?|$)/)) {
          return;
        }
        return setTimeout(refresh = (function(_this) {
          return function() {
            if (!$(img).is(':visible')) {
              return;
            }
            return $(img).clone().attr('src', new_src()).hide().appendTo(document.body).load(function() {
              if (!$(img).is(':visible')) {
                return;
              }
              img = $(this).replaceAll(img).show().get(0);
              return setTimeout(refresh, expires);
            }).error(function() {
              $(this).remove();
              return refresh();
            });
          };
        })(this), expires);
      };
      error = function() {
        return $(this).attr('src', new_src());
      };
      $(this).load(load).error(error);
      if (this.complete) {
        return $(this).load();
      }
    });
  };

}).call(this);