first pass for #1518

this only handles postTools privileges, topic and category will follow

src/privileges/helpers.js

@@ -0,0 +1,66 @@
+
+'use strict';
+
+var async = require('async'),
+
+	meta = require('../meta'),
+	user = require('../user'),
+	groups = require('../groups'),
+	categories = require('../categories');
+
+var helpers = {};
+
+helpers.allowedTo = function(privilege, uid, cid, callback) {
+	categories.getCategoryField(cid, 'disabled', function(err, disabled) {
+		if (err) {
+			return callback(err);
+		}
+
+		if (parseInt(disabled, 10) === 1) {
+			return callback(null, false);
+		}
+
+		async.parallel({
+			hasUserPrivilege: function(next) {
+				hasPrivilege(groups.isMember, 'cid:' + cid + ':privileges:' + privilege, uid, next);
+			},
+			hasGroupPrivilege: function(next) {
+				hasPrivilege(groups.isMemberOfGroupList, 'cid:' + cid + ':privileges:groups:' + privilege, uid, next);
+			},
+		}, function(err, results) {
+			if (err) {
+				return callback(err);
+			}
+			callback(null,  results.hasUserPrivilege && results.hasGroupPrivilege);
+		});
+	});
+};
+
+function hasPrivilege(method, group, uid, callback) {
+	groups.exists(group, function(err, exists) {
+		if (err) {
+			return callback(err);
+		}
+
+		if (!exists) {
+			return callback(null, true);
+		}
+
+		method(group, uid, callback);
+	});
+}
+
+helpers.hasEnoughReputationFor = function(privilege, uid, callback) {
+	if (parseInt(meta.config['privileges:disabled'], 10)) {
+		return callback(null, false);
+	}
+
+	user.getUserField(uid, 'reputation', function(err, reputation) {
+		if (err) {
+			return callback(null, false);
+		}
+		callback(null, parseInt(reputation, 10) >= parseInt(meta.config[privilege], 10));
+	});
+};
+
+module.exports = helpers;