@aikidosec/firewall/agent/hooks/isMainJsFile.js

Zen by Aikido is an embedded Application Firewall that autonomously protects Node.js apps against common and critical attacks, provides rate limiting, detects malicious traffic (including bots), and more.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.isMainJsFile = isMainJsFile;
const path_1 = require("path");
const isPlainObject_1 = require("../../helpers/isPlainObject");
/**
 * This function checks if the required file is the main file of the package.
 * It does this by checking the package.json file of the package.
 */
function isMainJsFile(pathInfo, requireId, filename, packageJson) {
    // If the name of the package is the same as the requireId (the argument passed to require), then it is the main file
    if (pathInfo.name === requireId) {
        return true;
    }
    // Check package.json main field
    if (typeof packageJson.main === "string" &&
        (0, path_1.resolve)(pathInfo.base, packageJson.main) === filename) {
        return true;
    }
    // Defaults to index.js if main field is not set
    if (packageJson.main === undefined) {
        if ((0, path_1.resolve)(pathInfo.base, "index.js") === filename) {
            return true;
        }
    }
    // Check exports field
    return doesMainExportMatchFilename(packageJson.exports, pathInfo.base, filename);
}
const allowedExportConditions = [
    "default",
    "node",
    "node-addons",
    "require",
];
/**
 * This function checks if the main package exported js file is the same as the passed file.
 */
function doesMainExportMatchFilename(exportsField, base, filename) {
    if (!exportsField) {
        return false;
    }
    if (typeof exportsField === "string") {
        if ((0, path_1.resolve)(base, exportsField) === filename) {
            return true;
        }
    }
    if (Array.isArray(exportsField)) {
        for (const value of exportsField) {
            if (typeof value === "string" && (0, path_1.resolve)(base, value) === filename) {
                return true;
            }
        }
    }
    else if ((0, isPlainObject_1.isPlainObject)(exportsField)) {
        for (const [key, value] of Object.entries(exportsField)) {
            if ([".", "./", "./index.js"].includes(key)) {
                if (typeof value === "string" && (0, path_1.resolve)(base, value) === filename) {
                    return true;
                }
                if ((0, isPlainObject_1.isPlainObject)(value)) {
                    for (const condition of allowedExportConditions) {
                        if (condition in value &&
                            typeof value[condition] === "string" &&
                            (0, path_1.resolve)(base, value[condition]) === filename) {
                            return true;
                        }
                    }
                }
            }
        }
    }
    return false;
}