etherpad-lite/node/AuthorManager.js

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/**
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* The AuthorManager controlls all information about the Pad authors
*/
/*
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* 2011 Peter 'Pita' Martischka
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS-IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
var db = require("./db").db;
var async = require("async");
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/**
* Returns the Author Id for a token. If the token is unkown,
* it creates a author for the token
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* @param {String} token The token
* @param {Function} callback callback (err, author)
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* The callback function that is called when the result is here
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*/
exports.getAuthor4Token = function (token, callback)
{
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var author;
async.waterfall([
//try to get the author for this token
function(callback)
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{
db.get("token2author:" + token, callback);
},
function(value, callback)
{
//there is no author with this token, so create one
if(value == null)
{
//create the new author name
author = "g." + _randomString(16);
//set the token2author db entry
db.set("token2author:" + token, author);
//set the globalAuthors db entry
var authorObj = {colorId : Math.floor(Math.random()*32), name: null, timestamp: new Date().getTime()};
db.set("globalAuthor:" + author, authorObj);
callback(null);
}
//there is a author with this token
else
{
author = value;
//update the author time
db.setSub("globalAuthor:" + author, ["timestamp"], new Date().getTime());
callback(null);
}
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}
], function(err)
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{
callback(err, author);
});
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}
/**
* Returns the Author Obj of the author
* @param {String} author The id of the author
* @param {Function} callback callback(err, authorObj)
*/
exports.getAuthor = function (author, callback)
{
db.get("globalAuthor:" + author, callback);
}
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/**
* Returns the color Id of the author
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* @param {String} author The id of the author
* @param {Function} callback callback(err, colorId)
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*/
exports.getAuthorColorId = function (author, callback)
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{
db.getSub("globalAuthor:" + author, ["colorId"], callback);
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}
/**
* Sets the color Id of the author
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* @param {String} author The id of the author
* @param {Function} callback (optional)
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*/
exports.setAuthorColorId = function (author, colorId, callback)
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{
db.setSub("globalAuthor:" + author, ["colorId"], colorId, callback);
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}
/**
* Returns the name of the author
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* @param {String} author The id of the author
* @param {Function} callback callback(err, name)
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*/
exports.getAuthorName = function (author, callback)
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{
db.getSub("globalAuthor:" + author, ["name"], callback);
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}
/**
* Sets the name of the author
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* @param {String} author The id of the author
* @param {Function} callback (optional)
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*/
exports.setAuthorName = function (author, name, callback)
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{
db.setSub("globalAuthor:" + author, ["name"], name, callback);
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}
/**
* Generates a random String with the given length. Is needed to generate the Author Ids
*/
function _randomString(len) {
// use only numbers and lowercase letters
var pieces = [];
for(var i=0;i<len;i++) {
pieces.push(Math.floor(Math.random()*36).toString(36).slice(-1));
}
return pieces.join('');
}