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JSON node: add JSON schema validation via msg.schema

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This commit is contained in:
Nathanaël Lécaudé
2018-06-28 23:16:43 -07:00
parent 9d219c163d
commit c39e2ffd56
2 changed files with 51 additions and 3 deletions
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53
nodes/core/parsers/70-JSON.js
View File

@@ -16,21 +16,57 @@
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'));
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;
var node = this;
this.on("input", function(msg) {
var validate = false;
if (msg.schema) {
if (typeof msg.schema === "object") {
// If input schema is different, re-compile it
if (JSON.stringify(this.schema) != JSON.stringify(msg.schema)) {
node.warn('Schema different, compiling');
try {
this.compiledSchema = ajv.compile(msg.schema);
this.schema = msg.schema;
} catch(e) {
this.schema = null;
this.compiledSchema = null;
node.error("JSON Schema error: failed to compile schema", msg);
return;
}
}
validate = true;
} else {
node.warn("Schema present but not an object, ignoring schema");
}
}
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));
node.send(msg);
if (validate) {
if (this.compiledSchema(msg[node.property])) {
node.send(msg);
} else {
msg.schemaError = this.compiledSchema.errors;
node.error(`JSON Schema error: ${ajv.errorsText(this.compiledSchema.errors)}`, msg);
}
} else {
node.send(msg);
}
}
catch(e) { node.error(e.message,msg); }
} else {
@@ -41,8 +77,19 @@ module.exports = function(RED) {
if (node.action === "" || node.action === "str") {
if (!Buffer.isBuffer(value)) {
try {
RED.util.setMessageProperty(msg,node.property,JSON.stringify(value,null,node.indent));
node.send(msg);
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(`JSON 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")); }
}

1
package.json
View File

@@ -33,6 +33,7 @@
"flow"
],
"dependencies": {
"ajv": "6.5.1",
"basic-auth": "2.0.0",
"bcryptjs": "2.4.3",
"body-parser": "1.18.3",