and.js
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and.js
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	"use strict";
	const locreq = require("locreq")(__dirname);
	const Promise = require("bluebird");
	const AccessStrategy = locreq("lib/chip-types/access-strategy.js");
	const Query = require("../../../datastore/query.js");

	function parse_params(app, params) {
	return Object.keys(params).map(i => new AccessStrategy(app, params[i]));
	}

	module.exports = function(app) {
	const and = {
	name: "and",
	getRestrictingQuery: async function(context, params) {
	const access_strategies = parse_params(app, params);
	const queries = await Promise.map(access_strategies, strategy =>
	strategy.getRestrictingQuery(context)
	);
	if (queries.some(query => query instanceof Query.DenyAll)) {
	return new Query.DenyAll();
	}
	const aggregated_pipeline = queries.reduce(
	(acc, query) => acc.concat(query.toPipeline()),
	[]
	);
	return Query.fromCustomPipeline(aggregated_pipeline);
	},
	item_sensitive: function(params) {
	const access_strategies = parse_params(app, params);
	return Promise.map(access_strategies, function(access_strategy) {
	return access_strategy.is_item_sensitive();
	}).reduce((a, b) => a \|\| b);
	},
	checker_function: function(context, params, item) {
	return and.item_sensitive(params).then(function(item_sensitive) {
	if (item_sensitive && item === undefined) {
	return undefined;
	} else {
	const access_strategies = parse_params(app, params);
	const results = access_strategies.map(function(strategy) {
	return strategy.check(context, item);
	});
	return Promise.all(results);
	}
	});
	},
	};

	return and;
	};