164 lines
4.2 KiB
JavaScript
164 lines
4.2 KiB
JavaScript
/**
|
|
* The Pad Manager is a Factory for pad Objects
|
|
*/
|
|
|
|
/*
|
|
* 2011 Peter 'Pita' Martischka (Primary Technology Ltd)
|
|
*
|
|
* 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 ERR = require("async-stacktrace");
|
|
var customError = require("../utils/customError");
|
|
require("../db/Pad");
|
|
var db = require("./DB").db;
|
|
|
|
/**
|
|
* An Object containing all known Pads. Provides "get" and "set" functions,
|
|
* which should be used instead of indexing with brackets. These prepend a
|
|
* colon to the key, to avoid conflicting with built-in Object methods or with
|
|
* these functions themselves.
|
|
*
|
|
* If this is needed in other places, it would be wise to make this a prototype
|
|
* that's defined somewhere more sensible.
|
|
*/
|
|
var globalPads = {
|
|
get: function (name) { return this[':'+name]; },
|
|
set: function (name, value) { this[':'+name] = value; },
|
|
remove: function (name) { delete this[':'+name]; }
|
|
};
|
|
|
|
/**
|
|
* An array of padId transformations. These represent changes in pad name policy over
|
|
* time, and allow us to "play back" these changes so legacy padIds can be found.
|
|
*/
|
|
var padIdTransforms = [
|
|
[/\s+/g, '_']
|
|
];
|
|
|
|
/**
|
|
* Returns a Pad Object with the callback
|
|
* @param id A String with the id of the pad
|
|
* @param {Function} callback
|
|
*/
|
|
exports.getPad = function(id, text, callback)
|
|
{
|
|
//check if this is a valid padId
|
|
if(!exports.isValidPadId(id))
|
|
{
|
|
callback(new customError(id + " is not a valid padId","apierror"));
|
|
return;
|
|
}
|
|
|
|
//make text an optional parameter
|
|
if(typeof text == "function")
|
|
{
|
|
callback = text;
|
|
text = null;
|
|
}
|
|
|
|
//check if this is a valid text
|
|
if(text != null)
|
|
{
|
|
//check if text is a string
|
|
if(typeof text != "string")
|
|
{
|
|
callback(new customError("text is not a string","apierror"));
|
|
return;
|
|
}
|
|
|
|
//check if text is less than 100k chars
|
|
if(text.length > 100000)
|
|
{
|
|
callback(new customError("text must be less than 100k chars","apierror"));
|
|
return;
|
|
}
|
|
}
|
|
|
|
var pad = globalPads.get(id);
|
|
|
|
//return pad if its already loaded
|
|
if(pad != null)
|
|
{
|
|
callback(null, pad);
|
|
}
|
|
//try to load pad
|
|
else
|
|
{
|
|
pad = new Pad(id);
|
|
|
|
//initalize the pad
|
|
pad.init(text, function(err)
|
|
{
|
|
if(ERR(err, callback)) return;
|
|
|
|
globalPads.set(id, pad);
|
|
callback(null, pad);
|
|
});
|
|
}
|
|
}
|
|
|
|
//checks if a pad exists
|
|
exports.doesPadExists = function(padId, callback)
|
|
{
|
|
db.get("pad:"+padId, function(err, value)
|
|
{
|
|
if(ERR(err, callback)) return;
|
|
callback(null, value != null);
|
|
});
|
|
}
|
|
|
|
//returns a sanitized padId, respecting legacy pad id formats
|
|
exports.sanitizePadId = function(padId, callback) {
|
|
var transform_index = arguments[2] || 0;
|
|
//we're out of possible transformations, so just return it
|
|
if(transform_index >= padIdTransforms.length)
|
|
{
|
|
callback(padId);
|
|
}
|
|
//check if padId exists
|
|
else
|
|
{
|
|
exports.doesPadExists(padId, function(junk, exists)
|
|
{
|
|
if(exists)
|
|
{
|
|
callback(padId);
|
|
}
|
|
else
|
|
{
|
|
//get the next transformation *that's different*
|
|
var transformedPadId = padId;
|
|
while(transformedPadId == padId && transform_index < padIdTransforms.length)
|
|
{
|
|
transformedPadId = padId.replace(padIdTransforms[transform_index][0], padIdTransforms[transform_index][1]);
|
|
transform_index += 1;
|
|
}
|
|
//check the next transform
|
|
exports.sanitizePadId(transformedPadId, callback, transform_index);
|
|
}
|
|
});
|
|
}
|
|
}
|
|
|
|
exports.isValidPadId = function(padId)
|
|
{
|
|
return /^(g.[a-zA-Z0-9]{16}\$)?[^$]{1,50}$/.test(padId);
|
|
}
|
|
|
|
//removes a pad from the array
|
|
exports.unloadPad = function(padId)
|
|
{
|
|
if(globalPads.get(padId))
|
|
globalPads.remove(padId);
|
|
}
|