micro-api-client/lib/pagination.js

Micro REST API client

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _slicedToArray = function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"]) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }; }();

exports.getPagination = getPagination;
function getPagination(response) {
  var links = response.headers.get("Link");
  var pagination = {};
  //var link, url, rel, m, page;
  if (links == null) {
    return null;
  }
  links = links.split(",");
  var total = response.headers.get("X-Total-Count");

  for (var i = 0, len = links.length; i < len; i++) {
    var link = links[i].replace(/(^\s*|\s*$)/, "");

    var _link$split = link.split(";"),
        _link$split2 = _slicedToArray(_link$split, 2),
        url = _link$split2[0],
        rel = _link$split2[1];

    var m = url.match(/page=(\d+)/);
    var page = m && parseInt(m[1], 10);
    if (rel.match(/last/)) {
      pagination.last = page;
    } else if (rel.match(/next/)) {
      pagination.next = page;
    } else if (rel.match(/prev/)) {
      pagination.prev = page;
    } else if (rel.match(/first/)) {
      pagination.first = page;
    }
  }

  pagination.last = Math.max(pagination.last || 0, pagination.prev && pagination.prev + 1 || 0);
  pagination.current = pagination.next ? pagination.next - 1 : pagination.last || 1;
  pagination.total = total ? parseInt(total, 10) : null;

  return pagination;
}