iD/modules/services/wikidata.js

import { jsonpRequest } from '../util/jsonp_request';
import { utilQsString } from '../util/index';


var wikidata = {},
    endpoint = 'https://www.wikidata.org/w/api.php?';


export function init() {

    // Given a Wikipedia language and article title, return an array of
    // corresponding Wikidata entities.
    wikidata.itemsByTitle = function(lang, title, callback) {
        if (!title) {
            callback('', {});
            return;
        }

        lang = lang || 'en';
        jsonpRequest(endpoint + utilQsString({
            action: 'wbgetentities',
            format: 'json',
            sites: lang.replace(/-/g, '_') + 'wiki',
            titles: title,
            languages: 'en', // shrink response by filtering to one language
            callback: '{callback}'
        }), function(data) {
            if (!data || data.error) {
                callback('', {});
            } else {
                callback(title, data.entities || {});
            }
        });
    };


    return wikidata;
}