56 lines
1.5 KiB
JavaScript
56 lines
1.5 KiB
JavaScript
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let _ = require('lodash');
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module.exports = function (default_sort, default_offset, default_limit, max_limit) {
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/**
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* This will setup the req query params with filtered data and defaults
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*
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* sort will be an array of fields and their direction
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* offset will be an int, defaulting to zero if no other default supplied
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* limit will be an int, defaulting to 50 if no other default supplied, and limited to the max if that was supplied
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*
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*/
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return function (req, res, next) {
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req.query.offset = typeof req.query.limit === 'undefined' ? default_offset || 0 : parseInt(req.query.offset, 10);
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req.query.limit = typeof req.query.limit === 'undefined' ? default_limit || 50 : parseInt(req.query.limit, 10);
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if (max_limit && req.query.limit > max_limit) {
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req.query.limit = max_limit;
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}
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// Sorting
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let sort = typeof req.query.sort === 'undefined' ? default_sort : req.query.sort;
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let myRegexp = /.*\.(asc|desc)$/ig;
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let sort_array = [];
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sort = sort.split(',');
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_.map(sort, function (val) {
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let matches = myRegexp.exec(val);
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if (matches !== null) {
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let dir = matches[1];
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sort_array.push({
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field: val.substr(0, val.length - (dir.length + 1)),
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dir: dir.toLowerCase()
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});
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} else {
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sort_array.push({
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field: val,
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dir: 'asc'
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});
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}
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});
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// Sort will now be in this format:
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// [
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// { field: 'field1', dir: 'asc' },
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// { field: 'field2', dir: 'desc' }
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// ]
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req.query.sort = sort_array;
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next();
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};
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};
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