75 lines
1.9 KiB
JavaScript
75 lines
1.9 KiB
JavaScript
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/**
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* The ReadOnlyManager manages the database and rendering releated to read only pads
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*/
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/*
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* 2011 Peter 'Pita' Martischka
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS-IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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var db = require("./db").db;
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var async = require("async");
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/**
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* returns a read only id for a pad
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* @param {String} padId the id of the pad
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*/
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exports.getReadOnlyId = function (padId, callback)
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{
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var readOnlyId;
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async.waterfall([
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//check if there is a pad2readonly entry
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function(callback)
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{
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db.get("pad2readonly:" + padId, callback);
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},
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function(dbReadOnlyId, callback)
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{
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//there is no readOnly Entry in the database, let's create one
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if(dbReadOnlyId == null)
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{
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readOnlyId = randomString(10);
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db.set("pad2readonly:" + padId, readOnlyId);
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db.set("readonly2pad:" + readOnlyId, padId);
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}
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//there is a readOnly Entry in the database, let's take this one
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else
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{
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readOnlyId = dbReadOnlyId;
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}
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callback();
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}
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], function(err)
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{
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//return the results
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callback(err, readOnlyId);
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})
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}
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/**
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* Generates a random String with the given length. Is needed to generate the read only ids
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*/
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function randomString(len)
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{
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// use only numbers and lowercase letters
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var pieces = [];
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for(var i=0;i<len;i++) {
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pieces.push(Math.floor(Math.random()*36).toString(36).slice(-1));
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}
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return pieces.join('');
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}
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