pad.pub0.org/node/AuthorManager.js

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2011-03-26 13:10:41 +00:00
/**
* 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.
*/
/**
* The AuthorManager controlls all information about the Pad authors
*/
/**
* Saves all Authors as a assoative Array. The Key is the author id.
* Authors can have the following attributes:
* -name The Name of the Author as shown on the Pad
* -colorId The Id of Usercolor. A number between 0 and 31
* -timestamp The timestamp on which the user was last seen
*/
var globalAuthors = {};
/**
* A easy key value pair. The Key is the token, the value is the authorid
*/
var token2author = {};
/**
* Returns the Author Id for a token. If the token is unkown,
* it creates a author for the token
* @param token The token
*/
exports.getAuthor4Token = function (token)
{
var author;
if(token2author[token] == null)
{
author = "g." + _randomString(16);
while(globalAuthors[author] != null)
{
author = "g." + _randomString(16);
}
token2author[token]=author;
globalAuthors[author] = {};
globalAuthors[author].colorId = Math.floor(Math.random()*32);
globalAuthors[author].name = null;
}
else
{
author = token2author[token];
}
globalAuthors[author].timestamp = new Date().getTime();
return author;
}
/**
* Returns the color Id of the author
*/
exports.getAuthorColorId = function (author)
{
throwExceptionIfAuthorNotExist(author);
return globalAuthors[author].colorId;
}
/**
* Sets the color Id of the author
*/
exports.setAuthorColorId = function (author, colorId)
{
throwExceptionIfAuthorNotExist(author);
globalAuthors[author].colorId = colorId;
}
/**
* Returns the name of the author
*/
exports.getAuthorName = function (author)
{
throwExceptionIfAuthorNotExist(author);
return globalAuthors[author].name;
}
/**
* Sets the name of the author
*/
exports.setAuthorName = function (author, name)
{
throwExceptionIfAuthorNotExist(author);
globalAuthors[author].name = name;
}
/**
* A internal function that checks if the Author exist and throws a exception if not
*/
function throwExceptionIfAuthorNotExist(author)
{
if(globalAuthors[author] == null)
{
throw "Author '" + author + "' is unkown!";
}
}
/**
* 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('');
}