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node-red/red/runtime/util.js

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/**
* Copyright 2014, 2016 IBM Corp.
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*
* 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 clone = require("clone");
var jsonata = require("jsonata");
function generateId() {
return (1+Math.random()*4294967295).toString(16);
}
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function ensureString(o) {
if (Buffer.isBuffer(o)) {
return o.toString();
} else if (typeof o === "object") {
return JSON.stringify(o);
} else if (typeof o === "string") {
return o;
}
return ""+o;
}
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function ensureBuffer(o) {
if (Buffer.isBuffer(o)) {
return o;
} else if (typeof o === "object") {
o = JSON.stringify(o);
} else if (typeof o !== "string") {
o = ""+o;
}
return new Buffer(o);
}
function cloneMessage(msg) {
// Temporary fix for #97
// TODO: remove this http-node-specific fix somehow
var req = msg.req;
var res = msg.res;
delete msg.req;
delete msg.res;
var m = clone(msg);
if (req) {
m.req = req;
msg.req = req;
}
if (res) {
m.res = res;
msg.res = res;
}
return m;
}
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function compareObjects(obj1,obj2) {
var i;
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if (obj1 === obj2) {
return true;
}
if (obj1 == null || obj2 == null) {
return false;
}
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var isArray1 = Array.isArray(obj1);
var isArray2 = Array.isArray(obj2);
if (isArray1 != isArray2) {
return false;
}
if (isArray1 && isArray2) {
if (obj1.length !== obj2.length) {
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return false;
}
for (i=0;i<obj1.length;i++) {
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if (!compareObjects(obj1[i],obj2[i])) {
return false;
}
}
return true;
}
var isBuffer1 = Buffer.isBuffer(obj1);
var isBuffer2 = Buffer.isBuffer(obj2);
if (isBuffer1 != isBuffer2) {
return false;
}
if (isBuffer1 && isBuffer2) {
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if (obj1.equals) {
// For node 0.12+ - use the native equals
return obj1.equals(obj2);
} else {
if (obj1.length !== obj2.length) {
return false;
}
for (i=0;i<obj1.length;i++) {
if (obj1.readUInt8(i) !== obj2.readUInt8(i)) {
return false;
}
}
return true;
}
}
if (typeof obj1 !== 'object' || typeof obj2 !== 'object') {
return false;
}
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var keys1 = Object.keys(obj1);
var keys2 = Object.keys(obj2);
if (keys1.length != keys2.length) {
return false;
}
for (var k in obj1) {
/* istanbul ignore else */
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if (obj1.hasOwnProperty(k)) {
if (!compareObjects(obj1[k],obj2[k])) {
return false;
}
}
}
return true;
}
function normalisePropertyExpression(str) {
var length = str.length;
var parts = [];
var start = 0;
var inString = false;
var inBox = false;
var quoteChar;
var v;
for (var i=0;i<length;i++) {
var c = str[i];
if (!inString) {
if (c === "'" || c === '"') {
if (!inBox) {
throw new Error("Invalid property expression: unexpected "+c+" at position "+i);
}
inString = true;
quoteChar = c;
start = i+1;
} else if (c === '.') {
if (i===0) {
throw new Error("Invalid property expression: unexpected . at position 0");
}
if (start != i) {
v = str.substring(start,i);
if (/^\d+$/.test(v)) {
parts.push(parseInt(v));
} else {
parts.push(v);
}
}
if (i===length-1) {
throw new Error("Invalid property expression: unterminated expression");
}
// Next char is a-z
if (!/[a-z0-9]/i.test(str[i+1])) {
throw new Error("Invalid property expression: unexpected "+str[i+1]+" at position "+(i+1));
}
start = i+1;
} else if (c === '[') {
if (i === 0) {
throw new Error("Invalid property expression: unexpected "+c+" at position "+i);
}
if (start != i) {
parts.push(str.substring(start,i));
}
if (i===length-1) {
throw new Error("Invalid property expression: unterminated expression");
}
// Next char is either a quote or a number
if (!/["'\d]/.test(str[i+1])) {
throw new Error("Invalid property expression: unexpected "+str[i+1]+" at position "+(i+1));
}
start = i+1;
inBox = true;
} else if (c === ']') {
if (!inBox) {
throw new Error("Invalid property expression: unexpected "+c+" at position "+i);
}
if (start != i) {
v = str.substring(start,i);
if (/^\d+$/.test(v)) {
parts.push(parseInt(v));
} else {
throw new Error("Invalid property expression: unexpected array expression at position "+start);
}
}
start = i+1;
inBox = false;
} else if (c === ' ') {
throw new Error("Invalid property expression: unexpected ' ' at position "+i);
}
} else {
if (c === quoteChar) {
parts.push(str.substring(start,i));
// Next char must be a ]
if (!/\]/.test(str[i+1])) {
throw new Error("Invalid property expression: unexpected array expression at position "+start);
}
start = i+1;
inString = false;
}
}
}
if (inBox || inString) {
throw new Error("Invalid property expression: unterminated expression");
}
if (start < length) {
parts.push(str.substring(start));
}
return parts;
}
function getMessageProperty(msg,expr) {
var result = null;
if (expr.indexOf('msg.')===0) {
expr = expr.substring(4);
}
var msgPropParts = normalisePropertyExpression(expr);
var m;
msgPropParts.reduce(function(obj, key) {
result = (typeof obj[key] !== "undefined" ? obj[key] : undefined);
return result;
}, msg);
return result;
}
function setMessageProperty(msg,prop,value,createMissing) {
if (typeof createMissing === 'undefined') {
createMissing = (typeof value !== 'undefined');
}
if (prop.indexOf('msg.')===0) {
prop = prop.substring(4);
}
var msgPropParts = normalisePropertyExpression(prop);
var depth = 0;
var length = msgPropParts.length;
var obj = msg;
var key;
for (var i=0;i<length-1;i++) {
key = msgPropParts[i];
if (typeof key === 'string' || (typeof key === 'number' && !Array.isArray(obj))) {
if (obj.hasOwnProperty(key)) {
obj = obj[key];
} else if (createMissing) {
if (typeof msgPropParts[i+1] === 'string') {
obj[key] = {};
} else {
obj[key] = [];
}
obj = obj[key];
} else {
return null;
}
} else if (typeof key === 'number') {
// obj is an array
if (obj[key] === undefined) {
if (createMissing) {
if (typeof msgPropParts[i+1] === 'string') {
obj[key] = {};
} else {
obj[key] = [];
}
obj = obj[key];
} else {
return null
}
} else {
obj = obj[key];
}
}
}
key = msgPropParts[length-1];
if (typeof value === "undefined") {
if (typeof key === 'number' && Array.isArray(obj)) {
obj.splice(key,1);
} else {
delete obj[key]
}
} else {
obj[key] = value;
}
}
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function evaluateNodeProperty(value, type, node, msg) {
if (type === 'str') {
return ""+value;
} else if (type === 'num') {
return Number(value);
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} else if (type === 'json') {
return JSON.parse(value);
} else if (type === 're') {
return new RegExp(value);
} else if (type === 'date') {
return Date.now();
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} else if (type === 'msg' && msg) {
return getMessageProperty(msg,value);
} else if (type === 'flow' && node) {
return node.context().flow.get(value);
} else if (type === 'global' && node) {
return node.context().global.get(value);
} else if (type === 'bool') {
return /^true$/i.test(value);
} else if (type === 'jsonata') {
return jsonata(value).evaluate({msg:msg});
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}
return value;
}
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module.exports = {
ensureString: ensureString,
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ensureBuffer: ensureBuffer,
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cloneMessage: cloneMessage,
compareObjects: compareObjects,
generateId: generateId,
getMessageProperty: getMessageProperty,
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setMessageProperty: setMessageProperty,
evaluateNodeProperty: evaluateNodeProperty,
normalisePropertyExpression: normalisePropertyExpression
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};