node-red
Version:
A visual tool for wiring the Internet of Things
608 lines (583 loc) • 20.5 kB
JavaScript
/**
* 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 clone = require("clone");
var jsonata = require("jsonata");
var safeJSONStringify = require("json-stringify-safe");
var util = require("util");
function generateId() {
return (1+Math.random()*4294967295).toString(16);
}
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;
}
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;
}
function compareObjects(obj1,obj2) {
var i;
if (obj1 === obj2) {
return true;
}
if (obj1 == null || obj2 == null) {
return false;
}
var isArray1 = Array.isArray(obj1);
var isArray2 = Array.isArray(obj2);
if (isArray1 != isArray2) {
return false;
}
if (isArray1 && isArray2) {
if (obj1.length !== obj2.length) {
return false;
}
for (i=0;i<obj1.length;i++) {
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) {
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;
}
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 */
if (obj1.hasOwnProperty(k)) {
if (!compareObjects(obj1[k],obj2[k])) {
return false;
}
}
}
return true;
}
function createError(code, message) {
var e = new Error(message);
e.code = code;
return e;
}
function normalisePropertyExpression(str) {
// This must be kept in sync with validatePropertyExpression
// in editor/js/ui/utils.js
var length = str.length;
if (length === 0) {
throw createError("INVALID_EXPR","Invalid property expression: zero-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 (i != start) {
throw createError("INVALID_EXPR","Invalid property expression: unexpected "+c+" at position "+i);
}
inString = true;
quoteChar = c;
start = i+1;
} else if (c === '.') {
if (i===0) {
throw createError("INVALID_EXPR","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 createError("INVALID_EXPR","Invalid property expression: unterminated expression");
}
// Next char is first char of an identifier: a-z 0-9 $ _
if (!/[a-z0-9\$\_]/i.test(str[i+1])) {
throw createError("INVALID_EXPR","Invalid property expression: unexpected "+str[i+1]+" at position "+(i+1));
}
start = i+1;
} else if (c === '[') {
if (i === 0) {
throw createError("INVALID_EXPR","Invalid property expression: unexpected "+c+" at position "+i);
}
if (start != i) {
parts.push(str.substring(start,i));
}
if (i===length-1) {
throw createError("INVALID_EXPR","Invalid property expression: unterminated expression");
}
// Next char is either a quote or a number
if (!/["'\d]/.test(str[i+1])) {
throw createError("INVALID_EXPR","Invalid property expression: unexpected "+str[i+1]+" at position "+(i+1));
}
start = i+1;
inBox = true;
} else if (c === ']') {
if (!inBox) {
throw createError("INVALID_EXPR","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 createError("INVALID_EXPR","Invalid property expression: unexpected array expression at position "+start);
}
}
start = i+1;
inBox = false;
} else if (c === ' ') {
throw createError("INVALID_EXPR","Invalid property expression: unexpected ' ' at position "+i);
}
} else {
if (c === quoteChar) {
if (i-start === 0) {
throw createError("INVALID_EXPR","Invalid property expression: zero-length string at position "+start);
}
parts.push(str.substring(start,i));
// If inBox, next char must be a ]. Otherwise it may be [ or .
if (inBox && !/\]/.test(str[i+1])) {
throw createError("INVALID_EXPR","Invalid property expression: unexpected array expression at position "+start);
} else if (!inBox && i+1!==length && !/[\[\.]/.test(str[i+1])) {
throw createError("INVALID_EXPR","Invalid property expression: unexpected "+str[i+1]+" expression at position "+(i+1));
}
start = i+1;
inString = false;
}
}
}
if (inBox || inString) {
throw new createError("INVALID_EXPR","Invalid property expression: unterminated expression");
}
if (start < length) {
parts.push(str.substring(start));
}
return parts;
}
function getMessageProperty(msg,expr) {
if (expr.indexOf('msg.')===0) {
expr = expr.substring(4);
}
return getObjectProperty(msg,expr);
}
function getObjectProperty(msg,expr) {
var result = null;
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 (prop.indexOf('msg.')===0) {
prop = prop.substring(4);
}
return setObjectProperty(msg,prop,value,createMissing);
}
function setObjectProperty(msg,prop,value,createMissing) {
if (typeof createMissing === 'undefined') {
createMissing = (typeof value !== 'undefined');
}
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;
}
}
function evaluateEnvProperty(value) {
if (/^\${[^}]+}$/.test(value)) {
// ${ENV_VAR}
value = value.substring(2,value.length-1);
value = process.env.hasOwnProperty(value)?process.env[value]:""
} else if (!/\${\S+}/.test(value)) {
// ENV_VAR
value = process.env.hasOwnProperty(value)?process.env[value]:""
} else {
// FOO${ENV_VAR}BAR
value = value.replace(/\${([^}]+)}/g, function(match, v) {
return process.env.hasOwnProperty(v)?process.env[v]:""
});
}
return value;
}
var parseContextStore = function(key) {
var parts = {};
var m = /^#:\((\S+?)\)::(.*)$/.exec(key);
if (m) {
parts.store = m[1];
parts.key = m[2];
} else {
parts.key = key;
}
return parts;
}
function evaluateNodeProperty(value, type, node, msg, callback) {
var result = value;
if (type === 'str') {
result = ""+value;
} else if (type === 'num') {
result = Number(value);
} else if (type === 'json') {
result = JSON.parse(value);
} else if (type === 're') {
result = new RegExp(value);
} else if (type === 'date') {
result = Date.now();
} else if (type === 'bin') {
var data = JSON.parse(value);
result = Buffer.from(data);
} else if (type === 'msg' && msg) {
try {
result = getMessageProperty(msg,value);
} catch(err) {
if (callback) {
callback(err);
} else {
throw err;
}
return;
}
} else if ((type === 'flow' || type === 'global') && node) {
var contextKey = parseContextStore(value);
result = node.context()[type].get(contextKey.key,contextKey.store,callback);
if (callback) {
return;
}
} else if (type === 'bool') {
result = /^true$/i.test(value);
} else if (type === 'jsonata') {
var expr = prepareJSONataExpression(value,node);
result = evaluateJSONataExpression(expr,msg);
} else if (type === 'env') {
result = evaluateEnvProperty(value);
}
if (callback) {
callback(null,result);
} else {
return result;
}
}
function prepareJSONataExpression(value,node) {
var expr = jsonata(value);
expr.assign('flowContext',function(val) {
return node.context().flow.get(val);
});
expr.assign('globalContext',function(val) {
return node.context().global.get(val);
});
expr.assign('env', function(val) {
return process.env[val];
})
expr.registerFunction('clone', cloneMessage, '<(oa)-:o>');
expr._legacyMode = /(^|[^a-zA-Z0-9_'"])msg([^a-zA-Z0-9_'"]|$)/.test(value);
expr._node = node;
return expr;
}
function evaluateJSONataExpression(expr,msg,callback) {
var context = msg;
if (expr._legacyMode) {
context = {msg:msg};
}
var bindings = {};
if (callback) {
// If callback provided, need to override the pre-assigned sync
// context functions to be their async variants
bindings.flowContext = function(val, store) {
return new Promise((resolve,reject) => {
expr._node.context().flow.get(val, store, function(err,value) {
if (err) {
reject(err);
} else {
resolve(value);
}
})
});
}
bindings.globalContext = function(val, store) {
return new Promise((resolve,reject) => {
expr._node.context().global.get(val, store, function(err,value) {
if (err) {
reject(err);
} else {
resolve(value);
}
})
});
}
}
return expr.evaluate(context, bindings, callback);
}
function normaliseNodeTypeName(name) {
var result = name.replace(/[^a-zA-Z0-9]/g, " ");
result = result.trim();
result = result.replace(/ +/g, " ");
result = result.replace(/ ./g,
function(s) {
return s.charAt(1).toUpperCase();
}
);
result = result.charAt(0).toLowerCase() + result.slice(1);
return result;
}
function encodeObject(msg,opts) {
var debuglength = 1000;
if (opts && opts.hasOwnProperty('maxLength')) {
debuglength = opts.maxLength;
}
var msgType = typeof msg.msg;
if (msg.msg instanceof Error) {
msg.format = "error";
var errorMsg = {};
if (msg.msg.name) {
errorMsg.name = msg.msg.name;
}
if (msg.msg.hasOwnProperty('message')) {
errorMsg.message = msg.msg.message;
} else {
errorMsg.message = msg.msg.toString();
}
msg.msg = JSON.stringify(errorMsg);
} else if (msg.msg instanceof Buffer) {
msg.format = "buffer["+msg.msg.length+"]";
msg.msg = msg.msg.toString('hex');
if (msg.msg.length > debuglength) {
msg.msg = msg.msg.substring(0,debuglength);
}
} else if (msg.msg && msgType === 'object') {
try {
msg.format = msg.msg.constructor.name || "Object";
// Handle special case of msg.req/res objects from HTTP In node
if (msg.format === "IncomingMessage" || msg.format === "ServerResponse") {
msg.format = "Object";
}
} catch(err) {
msg.format = "Object";
}
if (/error/i.test(msg.format)) {
msg.msg = JSON.stringify({
name: msg.msg.name,
message: msg.msg.message
});
} else {
var isArray = util.isArray(msg.msg);
if (isArray) {
msg.format = "array["+msg.msg.length+"]";
if (msg.msg.length > debuglength) {
// msg.msg = msg.msg.slice(0,debuglength);
msg.msg = {
__enc__: true,
type: "array",
data: msg.msg.slice(0,debuglength),
length: msg.msg.length
}
}
}
if (isArray || (msg.format === "Object")) {
msg.msg = safeJSONStringify(msg.msg, function(key, value) {
if (key === '_req' || key === '_res') {
value = {
__enc__: true,
type: "internal"
}
} else if (value instanceof Error) {
value = value.toString()
} else if (util.isArray(value) && value.length > debuglength) {
value = {
__enc__: true,
type: "array",
data: value.slice(0,debuglength),
length: value.length
}
} else if (typeof value === 'string') {
if (value.length > debuglength) {
value = value.substring(0,debuglength)+"...";
}
} else if (typeof value === 'function') {
value = {
__enc__: true,
type: "function"
}
} else if (typeof value === 'number') {
if (isNaN(value) || value === Infinity || value === -Infinity) {
value = {
__enc__: true,
type: "number",
data: value.toString()
}
}
} else if (value && value.constructor) {
if (value.type === "Buffer") {
value.__enc__ = true;
value.length = value.data.length;
if (value.length > debuglength) {
value.data = value.data.slice(0,debuglength);
}
} else if (value.constructor.name === "ServerResponse") {
value = "[internal]"
} else if (value.constructor.name === "Socket") {
value = "[internal]"
}
}
return value;
}," ");
} else {
try { msg.msg = msg.msg.toString(); }
catch(e) { msg.msg = "[Type not printable]"; }
}
}
} else if (msgType === "function") {
msg.format = "function";
msg.msg = "[function]"
} else if (msgType === "boolean") {
msg.format = "boolean";
msg.msg = msg.msg.toString();
} else if (msgType === "number") {
msg.format = "number";
msg.msg = msg.msg.toString();
} else if (msg.msg === null || msgType === "undefined") {
msg.format = (msg.msg === null)?"null":"undefined";
msg.msg = "(undefined)";
} else {
msg.format = "string["+msg.msg.length+"]";
if (msg.msg.length > debuglength) {
msg.msg = msg.msg.substring(0,debuglength)+"...";
}
}
return msg;
}
module.exports = {
encodeObject: encodeObject,
ensureString: ensureString,
ensureBuffer: ensureBuffer,
cloneMessage: cloneMessage,
compareObjects: compareObjects,
generateId: generateId,
getMessageProperty: getMessageProperty,
setMessageProperty: setMessageProperty,
getObjectProperty: getObjectProperty,
setObjectProperty: setObjectProperty,
evaluateNodeProperty: evaluateNodeProperty,
normalisePropertyExpression: normalisePropertyExpression,
normaliseNodeTypeName: normaliseNodeTypeName,
prepareJSONataExpression: prepareJSONataExpression,
evaluateJSONataExpression: evaluateJSONataExpression,
parseContextStore: parseContextStore
};