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node-red/red/runtime/settings.js

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/**
* Copyright JS Foundation and other contributors, http://js.foundation
*
* 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 when = require("when");
var clone = require("clone");
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var assert = require("assert");
var log = require("../util").log; // TODO: separate module
var util = require("./util");
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// localSettings are those provided in the runtime settings.js file
var localSettings = null;
// globalSettings are provided by storage - .config.json on localfilesystem
var globalSettings = null;
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// nodeSettings are those settings that a node module defines as being available
var nodeSettings = null;
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// A subset of globalSettings that deal with per-user settings
var userSettings = null;
var disableNodeSettings = null;
var storage = null;
var persistentSettings = {
init: function(settings) {
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localSettings = settings;
for (var i in settings) {
/* istanbul ignore else */
if (settings.hasOwnProperty(i) && i !== 'load' && i !== 'get' && i !== 'set' && i !== 'available' && i !== 'reset') {
// Don't allow any of the core functions get replaced via settings
(function() {
var j = i;
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persistentSettings.__defineGetter__(j,function() { return localSettings[j]; });
persistentSettings.__defineSetter__(j,function() { throw new Error("Property '"+j+"' is read-only"); });
})();
}
}
globalSettings = null;
nodeSettings = {};
disableNodeSettings = {};
},
load: function(_storage) {
storage = _storage;
return storage.getSettings().then(function(_settings) {
globalSettings = _settings;
if (globalSettings) {
userSettings = globalSettings.users || {};
}
else {
userSettings = {};
}
});
},
get: function(prop) {
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if (prop === 'users') {
throw new Error("Do not access user settings directly. Use settings.getUserSettings");
}
if (localSettings.hasOwnProperty(prop)) {
return clone(localSettings[prop]);
}
if (globalSettings === null) {
throw new Error(log._("settings.not-available"));
}
return clone(globalSettings[prop]);
},
set: function(prop,value) {
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if (prop === 'users') {
throw new Error("Do not access user settings directly. Use settings.setUserSettings");
}
if (localSettings.hasOwnProperty(prop)) {
throw new Error(log._("settings.property-read-only", {prop:prop}));
}
if (globalSettings === null) {
throw new Error(log._("settings.not-available"));
}
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var current = globalSettings[prop];
globalSettings[prop] = value;
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try {
assert.deepEqual(current,value);
return when.resolve();
} catch(err) {
return storage.saveSettings(globalSettings);
}
},
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delete: function(prop) {
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if (localSettings.hasOwnProperty(prop)) {
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throw new Error(log._("settings.property-read-only", {prop:prop}));
}
if (globalSettings === null) {
throw new Error(log._("settings.not-available"));
}
if (globalSettings.hasOwnProperty(prop)) {
delete globalSettings[prop];
return storage.saveSettings(globalSettings);
}
return when.resolve();
},
available: function() {
return (globalSettings !== null);
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},
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reset: function() {
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for (var i in localSettings) {
/* istanbul ignore else */
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if (localSettings.hasOwnProperty(i)) {
delete persistentSettings[i];
}
}
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localSettings = null;
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globalSettings = null;
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userSettings = null;
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storage = null;
},
registerNodeSettings: function(type, opts) {
var normalisedType = util.normaliseNodeTypeName(type);
for (var property in opts) {
if (opts.hasOwnProperty(property)) {
if (!property.startsWith(normalisedType)) {
throw new Error("Registered invalid property name '"+property+"'. Properties for this node must start with '"+normalisedType+"'");
}
}
}
nodeSettings[type] = opts;
},
exportNodeSettings: function(safeSettings) {
for (var type in nodeSettings) {
if (nodeSettings.hasOwnProperty(type) && !disableNodeSettings[type]) {
var nodeTypeSettings = nodeSettings[type];
for (var property in nodeTypeSettings) {
if (nodeTypeSettings.hasOwnProperty(property)) {
var setting = nodeTypeSettings[property];
if (setting.exportable) {
if (safeSettings.hasOwnProperty(property)) {
// Cannot overwrite existing setting
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} else if (localSettings.hasOwnProperty(property)) {
safeSettings[property] = localSettings[property];
} else if (setting.hasOwnProperty('value')) {
safeSettings[property] = setting.value;
}
}
}
}
}
}
return safeSettings;
},
enableNodeSettings: function(types) {
types.forEach(function(type) {
disableNodeSettings[type] = false;
});
},
disableNodeSettings: function(types) {
types.forEach(function(type) {
disableNodeSettings[type] = true;
});
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},
getUserSettings: function(username) {
return clone(userSettings[username]);
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},
setUserSettings: function(username,settings) {
if (globalSettings === null) {
throw new Error(log._("settings.not-available"));
}
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var current = userSettings[username];
userSettings[username] = settings;
try {
assert.deepEqual(current,settings);
return when.resolve();
} catch(err) {
globalSettings.users = userSettings;
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return storage.saveSettings(globalSettings);
}
}
}
module.exports = persistentSettings;