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