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node-red/nodes/core/parsers/70-JSON.js

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