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'use strict';
const wrap = require('co-express');
module.exports = setup;
// // //
/**
* Translation Middleware
*
* This function checks if a res.body has been set and will
* translate all found keys.
*
* @param {Object} i18n library configured instance
* @return {Function} middleware
*/
function setup(i18n) {
/**
* Middleware
* @param {Object} req Express request
* @param {Object} res Express response
* @param {Function} next Express next handler
* @returns {void}
*/
return wrap(function* middleware(req, res, next) {
if (!i18n) {
throw new Error(
'Missing i18n dependency, i18n middleware should be initialized with a configured instance of i18n'
);
}
if (res.body) {
res.body = yield i18n.translate(res.body, req.language);
return res.json(res.body);
}
return next();
});
}
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