78 lines
1.8 KiB
JavaScript
78 lines
1.8 KiB
JavaScript
const cds = require("@sap/cds");
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const { VM, VMScript } = require("vm2");
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const fs = require("fs");
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const path = require("path");
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class AdminService extends cds.ApplicationService {
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init() {
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const { Books, Authors } = cds.entities("sap.capire.bookshop");
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this.after("READ", async (result, req) => {
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const code = getCode(req, "READ");
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if (code) {
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await executeCode(code, req, result);
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}
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});
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this.after("READ", "ListOfBooks", (each) => {
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if (each.stock > 111) each.title += ` -- 11% discount!`;
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});
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this.before("CREATE", async (req) => {
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const code = getCode(req, "CREATE");
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if (code) {
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await executeCode(code, req);
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//console.log(req.data)
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}
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});
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//this.before("NEW", "Authors", genid);
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//this.before("NEW", "Books", genid);
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return super.init();
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}
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}
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function getCode(req, operation) {
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const filename = req.target.name + "." + operation + ".js";
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const file = path.join(__dirname, "..", "handlers", filename);
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try {
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const code = fs.readFileSync(file, "utf8");
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return code;
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} catch (error) {
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return "";
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}
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}
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function scanCode(code) {
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//ESLINT
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}
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async function executeCode(code, req, result) {
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let output = {};
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console.time("vm2");
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const vm = new VM({
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console: "inherit",
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timeout: 1000,
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allowAsync: true,
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sandbox: { req, result, output, cds, SELECT, INSERT, UPDATE, CREATE, JSON },
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});
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try {
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await vm.run(code)
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} catch (error) {
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req.reject('409','Error in VM')
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console.log(error)
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}
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// console.log(req.data)
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console.timeEnd("vm2");
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}
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/** Generate primary keys for target entity in request */
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async function genid(req) {
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const { ID } = await cds
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.tx(req)
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.run(SELECT.one.from(req.target).columns("max(ID) as ID"));
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req.data.ID = ID - (ID % 100) + 100 + 1;
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}
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module.exports = { AdminService };
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