const querystring = require('querystring')
const escape = require('escape-html')
// const deepAssign = require('deep-assign')
const path = require('path')
const paramsList = ['sort', 'page', 'search', 'subwindow', 'action', 'entryIds', 'backurl']
function extendParams(req, extraParams, unsetParams) {
let oldParams = paramsList.reduce((acc, curr) => {
if (req.SA.params[curr]) acc[curr] = req.SA.params[curr]
return acc
}, {})
// Object.assign({}, req.SA.params)
if (unsetParams instanceof Array)
unsetParams.map(param => delete oldParams[param])
else if (unsetParams instanceof String) delete oldParams[unsetParams]
else if (unsetParams === false) oldParams = {}
return Object.assign({}, oldParams, extraParams)
}
function queryExtender(req) {
/**
* @method req.SA.queryExtender
* @param {Array} pathParts url parts
* @param {Object} extraParams new url params
* @param {Array|String} unsetParams params to unset, false means unset all
* @returns {String} url
*/
return function (pathParts = [], extraParams = {}, unsetParams = []) {
const newParams = extendParams(req, extraParams, unsetParams)
return (
path.join(req.baseUrl, ...pathParts.map(p => String(p))) +
(Object.keys(newParams).length
? '?' +
querystring.stringify({
params: JSON.stringify(newParams)
})
: '')
)
}
}
function formExtender(req) {
/**
* @method req.SA.formExtender
* @param {Object} extraParams new form params
* @param {Array|String} unsetParams params to unset, false means unset all
* @returns {String} html, set of hidden form inputs with params
*/
return function (extraParams = {}, unsetParams = []) {
const newParams = extendParams(req, extraParams, unsetParams)
return (
'<input type="hidden" name="params" value="' +
escape(JSON.stringify(newParams)) +
'"/>'
)
}
}
module.exports = (req, res, next) => {
req.SA = Object.assign(req.SA || {}, {
params: Object.assign({}, JSON.parse(
(req.body || {}).params || (req.query || {}).params || '{}'
), req.query || {}, req.body || {}),
queryExtender: queryExtender(req),
formExtender: formExtender(req)
})
delete req.SA.params.params
next()
}