78 lines
2.2 KiB
JavaScript
78 lines
2.2 KiB
JavaScript
/**
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* @author Jon K (jon@ajarsoftware.com)
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* @copyright Crown Copyright 2016
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* @license Apache-2.0
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*/
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import jsonata from "jsonata";
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import Operation from "../Operation.mjs";
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import OperationError from "../errors/OperationError.mjs";
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/**
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* Jsonata Query operation
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*/
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class JsonataQuery extends Operation {
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/**
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* JsonataQuery constructor
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*/
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constructor() {
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super();
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this.name = "Jsonata Query";
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this.module = "Code";
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this.description =
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"Query and transform JSON data with a jsonata query.";
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this.infoURL = "https://docs.jsonata.org/overview.html";
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this.inputType = "string";
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this.outputType = "string";
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this.args = [
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{
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name: "Query",
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type: "text",
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value: "string",
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},
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];
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}
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/**
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* @param {string} input
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* @param {Object[]} args
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* @returns {string}
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*/
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async run(input, args) {
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const [query] = args;
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let result, jsonObj;
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try {
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jsonObj = JSON.parse(input);
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} catch (err) {
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throw new OperationError(`Invalid input JSON: ${err.message}`);
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}
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try {
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const expression = jsonata(query);
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// Override built-in base64 functions which fail in Web Worker
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// context where `window` is undefined. The jsonata library falls
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// back to `global.Buffer` which also does not exist in workers.
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// `atob`/`btoa` are available in both browser and worker scopes.
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expression.registerFunction("base64decode", (str) => {
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if (typeof str === "undefined") return undefined;
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return atob(str);
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}, "<s-:s>");
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expression.registerFunction("base64encode", (str) => {
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if (typeof str === "undefined") return undefined;
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return btoa(str);
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}, "<s-:s>");
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result = await expression.evaluate(jsonObj);
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} catch (err) {
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throw new OperationError(
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`Invalid Jsonata Expression: ${err.message}`
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);
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}
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return JSON.stringify(result === undefined ? "" : result);
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}
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}
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export default JsonataQuery;
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