var logger = require('pelias-logger').get('api'); var _ = require('lodash'); function setup() { return dedupeResults; } function dedupeResults(req, res, next) { // do nothing if no result data set if (_.isUndefined(req.clean) || _.isUndefined(res) || _.isUndefined(res.data)) { return next(); } // loop through data items and only copy unique items to uniqueResults var uniqueResults = []; _.some(res.data, function (hit) { if (uniqueResults.length === 0 || _.every(uniqueResults, isDifferent.bind(null, hit)) ) { uniqueResults.push(hit); } else { logger.info('[dupe]', { query: req.clean.text, hit: hit.name.default }); } // stop looping when requested size has been reached in uniqueResults return req.clean.size <= uniqueResults.length; }); res.data = uniqueResults; next(); } /** * @param {object} item1 * @param {object} item2 * @returns {boolean} * @throws {Error} */ function isDifferent(item1, item2) { try { propMatch(item1, item2, 'admin1_abbr'); propMatch(item1, item2, 'alpha3'); if (item1.hasOwnProperty('name') && item2.hasOwnProperty('name')) { propMatch(item1.name, item2.name, 'default'); } else { propMatch(item1, item2, 'name'); } if (item1.hasOwnProperty('address') && item2.hasOwnProperty('address')) { propMatch(item1.address, item2.address, 'number'); propMatch(item1.address, item2.address, 'street'); propMatch(item1.address, item2.address, 'zip'); } else if (item1.address !== item2.address) { throw new Error('different'); } } catch (err) { if (err.message === 'different') { return true; } throw err; } return false; } /** * Throw exception if properties are different * * @param {object} item1 * @param {object} item2 * @param {string} prop * @throws {Error} */ function propMatch(item1, item2, prop) { if (normalizeString(item1[prop]) !== normalizeString(item2[prop])) { throw new Error('different'); } } /** * Remove punctuation and lowercase * * @param {string} str * @returns {string} */ function normalizeString(str) { if (!str) { return ''; } return _.words(str.toLowerCase()).join(' '); } module.exports = setup;