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node-red/red/api/auth/tokens/localfilesystem.js

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/**
* Copyright 2015 IBM Corp.
*
* 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 fs = require('fs');
var when = require('when');
var nodeFn = require('when/node/function');
var fspath = require("path");
var settings;
var sessionsFile;
var sessions = {};
/**
* Write content to a file using UTF8 encoding.
* This forces a fsync before completing to ensure
* the write hits disk.
*/
function writeFile(path,content) {
return when.promise(function(resolve,reject) {
var stream = fs.createWriteStream(path);
stream.on('open',function(fd) {
stream.end(content,'utf8',function() {
fs.fsync(fd,resolve);
});
});
stream.on('error',function(err) {
reject(err);
});
});
}
var api = module.exports = {
init: function(_settings) {
settings = _settings;
var userDir = settings.userDir || process.env.NODE_RED_HOME;
sessionsFile = fspath.join(userDir,".sessions.json");
try {
sessions = JSON.parse(fs.readFileSync(sessionsFile,'utf8'));
} catch(err) {
sessions = {};
}
return when.resolve();
},
get: function(token) {
return when.resolve(sessions[token]);
},
create: function(token,session) {
sessions[token] = session;
return writeFile(sessionsFile,JSON.stringify(sessions));
},
delete: function(token) {
delete sessions[token];
return writeFile(sessionsFile,JSON.stringify(sessions));
}
}