username.js
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username.js
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	"use strict";
	const locreq = require("locreq")(__dirname);
	const me_synonyms = locreq("lib/misc/me-synonyms.json");
	const SuperContext = locreq("lib/super-context.js");

	module.exports = function(app) {
	return {
	name: "username",
	extends: "text",
	is_proper_value: function(context, params, new_value, old_value) {
	if (old_value === new_value) {
	return Promise.resolve();
	} else if (me_synonyms.indexOf(new_value) !== -1) {
	return Promise.reject(
	`'${new_value}'' is a reserved keyword. Please pick another username.`
	);
	} else {
	return app
	.run_action(
	new SuperContext(context),
	["collections", "users"],
	"show",
	{ filter: { username: new_value } }
	)
	.then(function(results) {
	if (results.length === 0) {
	return Promise.resolve();
	} else {
	return Promise.reject("Username already taken");
	}
	});
	}
	},
	};
	};