mirror of
https://github.com/node-red/node-red.git
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b78ef006ec
The function prepareJSONataExpression() does not take context store into account. This causes problems when using typedInput fields and getting the value of a property based on its type using evaluateNodeProperty().
820 lines
27 KiB
JavaScript
820 lines
27 KiB
JavaScript
/**
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* Copyright JS Foundation and other contributors, http://js.foundation
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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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* @ignore
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**/
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/**
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* @mixin @node-red/util_util
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*/
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const clone = require("clone");
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const jsonata = require("jsonata");
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const safeJSONStringify = require("json-stringify-safe");
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const util = require("util");
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/**
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* Generates a psuedo-unique-random id.
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* @return {String} a random-ish id
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* @memberof @node-red/util_util
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*/
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function generateId() {
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return (1+Math.random()*4294967295).toString(16);
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}
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/**
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* Converts the provided argument to a String, using type-dependent
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* methods.
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*
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* @param {any} o - the property to convert to a String
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* @return {String} the stringified version
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* @memberof @node-red/util_util
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*/
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function ensureString(o) {
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if (Buffer.isBuffer(o)) {
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return o.toString();
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} else if (typeof o === "object") {
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return JSON.stringify(o);
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} else if (typeof o === "string") {
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return o;
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}
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return ""+o;
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}
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/**
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* Converts the provided argument to a Buffer, using type-dependent
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* methods.
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*
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* @param {any} o - the property to convert to a Buffer
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* @return {String} the Buffer version
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* @memberof @node-red/util_util
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*/
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function ensureBuffer(o) {
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if (Buffer.isBuffer(o)) {
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return o;
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} else if (typeof o === "object") {
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o = JSON.stringify(o);
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} else if (typeof o !== "string") {
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o = ""+o;
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}
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return Buffer.from(o);
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}
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/**
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* Safely clones a message object. This handles msg.req/msg.res objects that must
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* not be cloned.
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*
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* @param {any} msg - the message object to clone
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* @return {Object} the cloned message
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* @memberof @node-red/util_util
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*/
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function cloneMessage(msg) {
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if (typeof msg !== "undefined") {
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// Temporary fix for #97
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// TODO: remove this http-node-specific fix somehow
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var req = msg.req;
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var res = msg.res;
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delete msg.req;
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delete msg.res;
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var m = clone(msg);
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if (req) {
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m.req = req;
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msg.req = req;
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}
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if (res) {
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m.res = res;
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msg.res = res;
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}
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return m;
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}
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return msg;
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}
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/**
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* Compares two objects, handling various JavaScript types.
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*
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* @param {any} obj1
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* @param {any} obj2
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* @return {boolean} whether the two objects are the same
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* @memberof @node-red/util_util
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*/
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function compareObjects(obj1,obj2) {
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var i;
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if (obj1 === obj2) {
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return true;
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}
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if (obj1 == null || obj2 == null) {
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return false;
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}
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var isArray1 = Array.isArray(obj1);
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var isArray2 = Array.isArray(obj2);
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if (isArray1 != isArray2) {
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return false;
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}
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if (isArray1 && isArray2) {
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if (obj1.length !== obj2.length) {
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return false;
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}
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for (i=0;i<obj1.length;i++) {
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if (!compareObjects(obj1[i],obj2[i])) {
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return false;
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}
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}
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return true;
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}
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var isBuffer1 = Buffer.isBuffer(obj1);
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var isBuffer2 = Buffer.isBuffer(obj2);
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if (isBuffer1 != isBuffer2) {
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return false;
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}
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if (isBuffer1 && isBuffer2) {
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if (obj1.equals) {
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// For node 0.12+ - use the native equals
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return obj1.equals(obj2);
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} else {
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if (obj1.length !== obj2.length) {
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return false;
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}
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for (i=0;i<obj1.length;i++) {
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if (obj1.readUInt8(i) !== obj2.readUInt8(i)) {
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return false;
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}
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}
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return true;
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}
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}
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if (typeof obj1 !== 'object' || typeof obj2 !== 'object') {
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return false;
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}
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var keys1 = Object.keys(obj1);
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var keys2 = Object.keys(obj2);
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if (keys1.length != keys2.length) {
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return false;
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}
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for (var k in obj1) {
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/* istanbul ignore else */
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if (obj1.hasOwnProperty(k)) {
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if (!compareObjects(obj1[k],obj2[k])) {
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return false;
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}
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}
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}
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return true;
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}
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function createError(code, message) {
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var e = new Error(message);
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e.code = code;
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return e;
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}
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/**
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* Parses a property expression, such as `msg.foo.bar[3]` to validate it
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* and convert it to a canonical version expressed as an Array of property
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* names.
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*
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* For example, `a["b"].c` returns `['a','b','c']`
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*
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* @param {String} str - the property expression
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* @return {Array} the normalised expression
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* @memberof @node-red/util_util
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*/
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function normalisePropertyExpression(str) {
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// This must be kept in sync with validatePropertyExpression
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// in editor/js/ui/utils.js
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var length = str.length;
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if (length === 0) {
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throw createError("INVALID_EXPR","Invalid property expression: zero-length");
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}
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var parts = [];
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var start = 0;
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var inString = false;
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var inBox = false;
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var quoteChar;
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var v;
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for (var i=0;i<length;i++) {
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var c = str[i];
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if (!inString) {
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if (c === "'" || c === '"') {
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if (i != start) {
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throw createError("INVALID_EXPR","Invalid property expression: unexpected "+c+" at position "+i);
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}
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inString = true;
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quoteChar = c;
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start = i+1;
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} else if (c === '.') {
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if (i===0) {
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throw createError("INVALID_EXPR","Invalid property expression: unexpected . at position 0");
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}
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if (start != i) {
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v = str.substring(start,i);
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if (/^\d+$/.test(v)) {
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parts.push(parseInt(v));
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} else {
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parts.push(v);
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}
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}
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if (i===length-1) {
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throw createError("INVALID_EXPR","Invalid property expression: unterminated expression");
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}
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// Next char is first char of an identifier: a-z 0-9 $ _
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if (!/[a-z0-9\$\_]/i.test(str[i+1])) {
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throw createError("INVALID_EXPR","Invalid property expression: unexpected "+str[i+1]+" at position "+(i+1));
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}
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start = i+1;
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} else if (c === '[') {
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if (i === 0) {
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throw createError("INVALID_EXPR","Invalid property expression: unexpected "+c+" at position "+i);
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}
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if (start != i) {
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parts.push(str.substring(start,i));
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}
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if (i===length-1) {
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throw createError("INVALID_EXPR","Invalid property expression: unterminated expression");
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}
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// Next char is either a quote or a number
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if (!/["'\d]/.test(str[i+1])) {
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throw createError("INVALID_EXPR","Invalid property expression: unexpected "+str[i+1]+" at position "+(i+1));
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}
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start = i+1;
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inBox = true;
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} else if (c === ']') {
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if (!inBox) {
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throw createError("INVALID_EXPR","Invalid property expression: unexpected "+c+" at position "+i);
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}
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if (start != i) {
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v = str.substring(start,i);
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if (/^\d+$/.test(v)) {
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parts.push(parseInt(v));
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} else {
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throw createError("INVALID_EXPR","Invalid property expression: unexpected array expression at position "+start);
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}
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}
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start = i+1;
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inBox = false;
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} else if (c === ' ') {
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throw createError("INVALID_EXPR","Invalid property expression: unexpected ' ' at position "+i);
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}
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} else {
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if (c === quoteChar) {
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if (i-start === 0) {
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throw createError("INVALID_EXPR","Invalid property expression: zero-length string at position "+start);
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}
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parts.push(str.substring(start,i));
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// If inBox, next char must be a ]. Otherwise it may be [ or .
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if (inBox && !/\]/.test(str[i+1])) {
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throw createError("INVALID_EXPR","Invalid property expression: unexpected array expression at position "+start);
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} else if (!inBox && i+1!==length && !/[\[\.]/.test(str[i+1])) {
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throw createError("INVALID_EXPR","Invalid property expression: unexpected "+str[i+1]+" expression at position "+(i+1));
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}
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start = i+1;
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inString = false;
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}
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}
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}
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if (inBox || inString) {
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throw new createError("INVALID_EXPR","Invalid property expression: unterminated expression");
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}
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if (start < length) {
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parts.push(str.substring(start));
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}
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return parts;
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}
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/**
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* Gets a property of a message object.
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*
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* Unlike {@link @node-red/util-util.getObjectProperty}, this function will strip `msg.` from the
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* front of the property expression if present.
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*
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* @param {Object} msg - the message object
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* @param {String} expr - the property expression
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* @return {any} the message property, or undefined if it does not exist
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* @memberof @node-red/util_util
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*/
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function getMessageProperty(msg,expr) {
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if (expr.indexOf('msg.')===0) {
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expr = expr.substring(4);
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}
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return getObjectProperty(msg,expr);
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}
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/**
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* Gets a property of an object.
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*
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* @param {Object} msg - the object
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* @param {String} expr - the property expression
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* @return {any} the object property, or undefined if it does not exist
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* @memberof @node-red/util_util
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*/
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function getObjectProperty(msg,expr) {
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var result = null;
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var msgPropParts = normalisePropertyExpression(expr);
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var m;
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msgPropParts.reduce(function(obj, key) {
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result = (typeof obj[key] !== "undefined" ? obj[key] : undefined);
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return result;
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}, msg);
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return result;
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}
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/**
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* Sets a property of a message object.
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*
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* Unlike {@link @node-red/util-util.setObjectProperty}, this function will strip `msg.` from the
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* front of the property expression if present.
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*
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* @param {Object} msg - the message object
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* @param {String} prop - the property expression
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* @param {any} value - the value to set
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* @param {boolean} createMissing - whether to create missing parent properties
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* @memberof @node-red/util_util
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*/
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function setMessageProperty(msg,prop,value,createMissing) {
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if (prop.indexOf('msg.')===0) {
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prop = prop.substring(4);
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}
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return setObjectProperty(msg,prop,value,createMissing);
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}
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/**
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* Sets a property of an object.
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*
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* @param {Object} msg - the object
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* @param {String} prop - the property expression
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* @param {any} value - the value to set
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* @param {boolean} createMissing - whether to create missing parent properties
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* @memberof @node-red/util_util
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*/
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function setObjectProperty(msg,prop,value,createMissing) {
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if (typeof createMissing === 'undefined') {
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createMissing = (typeof value !== 'undefined');
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}
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var msgPropParts = normalisePropertyExpression(prop);
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var depth = 0;
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var length = msgPropParts.length;
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var obj = msg;
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var key;
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for (var i=0;i<length-1;i++) {
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key = msgPropParts[i];
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if (typeof key === 'string' || (typeof key === 'number' && !Array.isArray(obj))) {
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if (obj.hasOwnProperty(key)) {
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obj = obj[key];
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} else if (createMissing) {
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if (typeof msgPropParts[i+1] === 'string') {
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obj[key] = {};
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} else {
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obj[key] = [];
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}
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obj = obj[key];
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} else {
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return null;
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}
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} else if (typeof key === 'number') {
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// obj is an array
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if (obj[key] === undefined) {
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if (createMissing) {
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if (typeof msgPropParts[i+1] === 'string') {
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obj[key] = {};
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} else {
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obj[key] = [];
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}
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obj = obj[key];
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} else {
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return null;
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}
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} else {
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obj = obj[key];
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}
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}
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}
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key = msgPropParts[length-1];
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if (typeof value === "undefined") {
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if (typeof key === 'number' && Array.isArray(obj)) {
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obj.splice(key,1);
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} else {
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delete obj[key]
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}
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} else {
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obj[key] = value;
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}
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}
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/*!
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* Get value of environment variable.
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* @param {Node} node - accessing node
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* @param {String} name - name of variable
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* @return {String} value of env var
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*/
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function getSetting(node, name) {
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if (node && node._flow) {
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var flow = node._flow;
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if (flow) {
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return flow.getSetting(name);
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}
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}
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return process.env[name];
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}
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/**
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* Checks if a String contains any Environment Variable specifiers and returns
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* it with their values substituted in place.
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*
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* For example, if the env var `WHO` is set to `Joe`, the string `Hello ${WHO}!`
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* will return `Hello Joe!`.
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* @param {String} value - the string to parse
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* @param {Node} node - the node evaluating the property
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* @return {String} The parsed string
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* @memberof @node-red/util_util
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*/
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function evaluateEnvProperty(value, node) {
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var result;
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if (/^\${[^}]+}$/.test(value)) {
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// ${ENV_VAR}
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var name = value.substring(2,value.length-1);
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result = getSetting(node, name);
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} else if (!/\${\S+}/.test(value)) {
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// ENV_VAR
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result = getSetting(node, value);
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} else {
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// FOO${ENV_VAR}BAR
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return value.replace(/\${([^}]+)}/g, function(match, name) {
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var val = getSetting(node, name);
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return (val === undefined)?"":val;
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});
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}
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return (result === undefined)?"":result;
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}
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/**
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* Parses a context property string, as generated by the TypedInput, to extract
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* the store name if present.
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*
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* For example, `#:(file)::foo` results in ` { store: "file", key: "foo" }`.
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*
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* @param {String} key - the context property string to parse
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* @return {Object} The parsed property
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* @memberof @node-red/util_util
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*/
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function parseContextStore(key) {
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var parts = {};
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var m = /^#:\((\S+?)\)::(.*)$/.exec(key);
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if (m) {
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parts.store = m[1];
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parts.key = m[2];
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} else {
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parts.key = key;
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}
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return parts;
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}
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/**
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* Evaluates a property value according to its type.
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*
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* @param {String} value - the raw value
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* @param {String} type - the type of the value
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* @param {Node} node - the node evaluating the property
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* @param {Object} msg - the message object to evaluate against
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* @param {Function} callback - (optional) called when the property is evaluated
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* @return {any} The evaluted property, if no `callback` is provided
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* @memberof @node-red/util_util
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*/
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function evaluateNodeProperty(value, type, node, msg, callback) {
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var result = value;
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if (type === 'str') {
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result = ""+value;
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} else if (type === 'num') {
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result = Number(value);
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} else if (type === 'json') {
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result = JSON.parse(value);
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} else if (type === 're') {
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result = new RegExp(value);
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} else if (type === 'date') {
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result = Date.now();
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} else if (type === 'bin') {
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var data = JSON.parse(value);
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result = Buffer.from(data);
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} else if (type === 'msg' && msg) {
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try {
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result = getMessageProperty(msg,value);
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} catch(err) {
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if (callback) {
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callback(err);
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} else {
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throw err;
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}
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return;
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}
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} else if ((type === 'flow' || type === 'global') && node) {
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var contextKey = parseContextStore(value);
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result = node.context()[type].get(contextKey.key,contextKey.store,callback);
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if (callback) {
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|
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, node);
|
|
}
|
|
if (callback) {
|
|
callback(null,result);
|
|
} else {
|
|
return result;
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Prepares a JSONata expression for evaluation.
|
|
* This attaches Node-RED specific functions to the expression.
|
|
*
|
|
* @param {String} value - the JSONata expression
|
|
* @param {Node} node - the node evaluating the property
|
|
* @return {Object} The JSONata expression that can be evaluated
|
|
* @memberof @node-red/util_util
|
|
*/
|
|
function prepareJSONataExpression(value,node) {
|
|
var expr = jsonata(value);
|
|
expr.assign('flowContext',function(val, store) {
|
|
return node.context().flow.get(val, store);
|
|
});
|
|
expr.assign('globalContext',function(val, store) {
|
|
return node.context().global.get(val, store);
|
|
});
|
|
expr.assign('env', function(name) {
|
|
var val = getSetting(node, name);
|
|
return (val ? 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;
|
|
}
|
|
|
|
/**
|
|
* Evaluates a JSONata expression.
|
|
* The expression must have been prepared with {@link @node-red/util-util.prepareJSONataExpression}
|
|
* before passing to this function.
|
|
*
|
|
* @param {Object} expr - the prepared JSONata expression
|
|
* @param {Object} msg - the message object to evaluate against
|
|
* @param {Function} callback - (optional) called when the expression is evaluated
|
|
* @return {any} If no callback was provided, the result of the expression
|
|
* @memberof @node-red/util_util
|
|
*/
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* Normalise a node type name to camel case.
|
|
*
|
|
* For example: `a-random node type` will normalise to `aRandomNodeType`
|
|
*
|
|
* @param {String} name - the node type
|
|
* @return {String} The normalised name
|
|
* @memberof @node-red/util_util
|
|
*/
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* Encode an object to JSON without losing information about non-JSON types
|
|
* such as Buffer and Function.
|
|
*
|
|
* *This function is closely tied to its reverse within the editor*
|
|
*
|
|
* @param {Object} msg
|
|
* @param {Object} opts
|
|
* @return {Object} the encoded object
|
|
* @memberof @node-red/util_util
|
|
*/
|
|
function encodeObject(msg,opts) {
|
|
try {
|
|
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]" + util.inspect(msg.msg); }
|
|
}
|
|
}
|
|
} 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;
|
|
} catch(e) {
|
|
msg.format = "error";
|
|
var errorMsg = {};
|
|
if (e.name) {
|
|
errorMsg.name = e.name;
|
|
}
|
|
if (e.hasOwnProperty('message')) {
|
|
errorMsg.message = 'encodeObject Error: ['+e.message + '] Value: '+util.inspect(msg.msg);
|
|
} else {
|
|
errorMsg.message = 'encodeObject Error: ['+e.toString() + '] Value: '+util.inspect(msg.msg);
|
|
}
|
|
if (errorMsg.message.length > debuglength) {
|
|
errorMsg.message = errorMsg.message.substring(0,debuglength);
|
|
}
|
|
msg.msg = JSON.stringify(errorMsg);
|
|
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
|
|
};
|