mirror of
https://github.com/node-red/node-red.git
synced 2023-10-10 13:36:53 +02:00
406 lines
13 KiB
JavaScript
406 lines
13 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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**/
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var clone = require("clone");
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var jsonata = require("jsonata");
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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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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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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 new Buffer(o);
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}
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function cloneMessage(msg) {
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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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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 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 new Error("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 new Error("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 new Error("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 new Error("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 new Error("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 new Error("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 new Error("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 new Error("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 new Error("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 new Error("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 new Error("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 new Error("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 new Error("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 new Error("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 Error("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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function getMessageProperty(msg,expr) {
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var result = null;
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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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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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function setMessageProperty(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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if (prop.indexOf('msg.')===0) {
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prop = prop.substring(4);
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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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function evaluteEnvProperty(value) {
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if (/^\${[^}]+}$/.test(value)) {
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// ${ENV_VAR}
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value = value.substring(2,value.length-1);
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value = process.env.hasOwnProperty(value)?process.env[value]:""
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} else if (!/\${\S+}/.test(value)) {
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// ENV_VAR
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value = process.env.hasOwnProperty(value)?process.env[value]:""
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} else {
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// FOO${ENV_VAR}BAR
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value = value.replace(/\${([^}]+)}/g, function(match, v) {
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return process.env.hasOwnProperty(v)?process.env[v]:""
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});
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}
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return value;
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}
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function evaluateNodeProperty(value, type, node, msg) {
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if (type === 'str') {
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return ""+value;
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} else if (type === 'num') {
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return Number(value);
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} else if (type === 'json') {
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return JSON.parse(value);
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} else if (type === 're') {
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return new RegExp(value);
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} else if (type === 'date') {
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return Date.now();
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} else if (type === 'bin') {
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var data = JSON.parse(value);
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return Buffer.from(data);
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} else if (type === 'msg' && msg) {
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return getMessageProperty(msg,value);
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} else if (type === 'flow' && node) {
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return node.context().flow.get(value);
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} else if (type === 'global' && node) {
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return node.context().global.get(value);
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} else if (type === 'bool') {
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return /^true$/i.test(value);
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} else if (type === 'jsonata') {
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var expr = prepareJSONataExpression(value,node);
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return evaluateJSONataExpression(expr,msg);
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} else if (type === 'env') {
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return evaluteEnvProperty(value);
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}
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return value;
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}
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function prepareJSONataExpression(value,node) {
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var expr = jsonata(value);
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expr.assign('flowContext',function(val) {
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return node.context().flow.get(val);
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});
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expr.assign('globalContext',function(val) {
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return node.context().global.get(val);
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});
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expr.assign('env', function(val) {
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return process.env[val];
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})
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expr.registerFunction('clone', cloneMessage, '<(oa)-:o>');
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expr._legacyMode = /(^|[^a-zA-Z0-9_'"])msg([^a-zA-Z0-9_'"]|$)/.test(value);
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return expr;
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}
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function evaluateJSONataExpression(expr,msg) {
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var context = msg;
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if (expr._legacyMode) {
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context = {msg:msg};
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}
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return expr.evaluate(context);
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}
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function normaliseNodeTypeName(name) {
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var result = name.replace(/[^a-zA-Z0-9]/g, " ");
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result = result.trim();
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result = result.replace(/ +/g, " ");
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result = result.replace(/ ./g,
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function(s) {
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return s.charAt(1).toUpperCase();
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}
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);
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result = result.charAt(0).toLowerCase() + result.slice(1);
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return result;
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}
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module.exports = {
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ensureString: ensureString,
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ensureBuffer: ensureBuffer,
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cloneMessage: cloneMessage,
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compareObjects: compareObjects,
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generateId: generateId,
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getMessageProperty: getMessageProperty,
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setMessageProperty: setMessageProperty,
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evaluateNodeProperty: evaluateNodeProperty,
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normalisePropertyExpression: normalisePropertyExpression,
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normaliseNodeTypeName: normaliseNodeTypeName,
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prepareJSONataExpression: prepareJSONataExpression,
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evaluateJSONataExpression: evaluateJSONataExpression
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};
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