mirror of https://github.com/node-red/node-red.git
124 lines
5.7 KiB
JavaScript
124 lines
5.7 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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module.exports = function(RED) {
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"use strict";
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const Ajv = require('ajv');
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const ajv = new Ajv({allErrors: true, schemaId: 'auto'});
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ajv.addMetaSchema(require('ajv/lib/refs/json-schema-draft-04.json'));
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ajv.addMetaSchema(require('ajv/lib/refs/json-schema-draft-06.json'));
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function JSONNode(n) {
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RED.nodes.createNode(this,n);
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this.indent = n.pretty ? 4 : 0;
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this.action = n.action||"";
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this.property = n.property||"payload";
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this.schema = null;
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this.compiledSchema = null;
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var node = this;
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this.on("input", function(msg) {
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var validate = false;
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if (msg.schema) {
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// If input schema is different, re-compile it
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if (JSON.stringify(this.schema) != JSON.stringify(msg.schema)) {
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try {
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this.compiledSchema = ajv.compile(msg.schema);
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this.schema = msg.schema;
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} catch(e) {
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this.schema = null;
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this.compiledSchema = null;
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node.error(RED._("json.errors.schema-error-compile"), msg);
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return;
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}
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}
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validate = true;
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}
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var value = RED.util.getMessageProperty(msg,node.property);
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if (value !== undefined) {
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if (typeof value === "string") {
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if (node.action === "" || node.action === "obj") {
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try {
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RED.util.setMessageProperty(msg,node.property,JSON.parse(value));
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if (validate) {
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if (this.compiledSchema(msg[node.property])) {
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node.send(msg);
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} else {
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msg.schemaError = this.compiledSchema.errors;
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node.error(`${RED._("json.errors.schema-error")}: ${ajv.errorsText(this.compiledSchema.errors)}`, msg);
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}
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} else {
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node.send(msg);
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}
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}
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catch(e) { node.error(e.message,msg); }
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} else {
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// If node.action is str and value is str
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if (validate) {
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if (this.compiledSchema(JSON.parse(msg[node.property]))) {
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node.send(msg);
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} else {
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msg.schemaError = this.compiledSchema.errors;
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node.error(`${RED._("json.errors.schema-error")}: ${ajv.errorsText(this.compiledSchema.errors)}`, msg);
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}
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} else {
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node.send(msg);
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}
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}
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}
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else if (typeof value === "object") {
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if (node.action === "" || node.action === "str") {
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if (!Buffer.isBuffer(value)) {
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try {
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if (validate) {
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if (this.compiledSchema(value)) {
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RED.util.setMessageProperty(msg,node.property,JSON.stringify(value,null,node.indent));
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node.send(msg);
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} else {
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msg.schemaError = this.compiledSchema.errors;
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node.error(`${RED._("json.errors.schema-error")}: ${ajv.errorsText(this.compiledSchema.errors)}`, msg);
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}
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} else {
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RED.util.setMessageProperty(msg,node.property,JSON.stringify(value,null,node.indent));
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node.send(msg);
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}
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}
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catch(e) { node.error(RED._("json.errors.dropped-error")); }
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}
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else { node.warn(RED._("json.errors.dropped-object")); }
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} else {
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// If node.action is obj and value is object
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if (validate) {
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if (this.compiledSchema(value)) {
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node.send(msg);
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} else {
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msg.schemaError = this.compiledSchema.errors;
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node.error(`${RED._("json.errors.schema-error")}: ${ajv.errorsText(this.compiledSchema.errors)}`, msg);
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}
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} else {
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node.send(msg);
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}
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}
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}
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else { node.warn(RED._("json.errors.dropped")); }
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}
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else { node.send(msg); } // If no property - just pass it on.
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});
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}
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RED.nodes.registerType("json",JSONNode);
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}
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