@aikidosec/firewall/helpers/cleanupStackTrace.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.cleanupStackTrace = cleanupStackTrace;
const escapeStringRegexp_1 = require("./escapeStringRegexp");
function cleanupStackTrace(stack, libraryRoot) {
    try {
        const newStackLines = stack
            .split("\n")
            .filter(createLineFilter(libraryRoot))
            .map(createLineMapper(libraryRoot));
        // If the stack only has one line (the error message), we return the original stack trace.
        // This could happen if the detected library root is wrong
        if (newStackLines.length <= 1) {
            return stack;
        }
        return newStackLines.join("\n").trim();
    }
    catch {
        // Safer to return the original stack trace in case of an error
        // than to crash the application
        return stack;
    }
}
function createLineFilter(libraryRoot) {
    const justACarrot = /^\^$/;
    const pathRegexWithLineNumbers = new RegExp("^" + (0, escapeStringRegexp_1.escapeStringRegexp)(libraryRoot) + "\\S*(:\\d+){1,2}$");
    return function lineFilter(line) {
        if (line.includes("cleanupStackTrace") && line.includes("new Error")) {
            return false;
        }
        // /Users/hansott/Code/my-project/server/node_modules/@aikidosec/firewall/agent/applyHooks.js:152
        if (pathRegexWithLineNumbers.test(line.trimStart())) {
            return false;
        }
        // Cleanup carrot under new Error().stack!
        // stack: cleanupStackTrace(new Error().stack!, libraryRoot),
        //                           ^
        if (justACarrot.test(line.trimStart())) {
            return false;
        }
        // Cleanup our own stack traces
        // Examples:
        // at Collection.wrap (/Code/runtime-node/build/agent/applyHooks.js:154:75)
        // at /Code/runtime-node/build/sources/express/wrapRequestHandler.js:22:20
        const parts = line.trimStart().split(" ");
        if (parts.length > 1 && line.trimStart().startsWith("at ")) {
            const lastPart = parts[parts.length - 1];
            if (lastPart.startsWith("(") &&
                lastPart.endsWith(")") &&
                pathRegexWithLineNumbers.test(lastPart.slice(1, -1))) {
                return false;
            }
            if (pathRegexWithLineNumbers.test(lastPart)) {
                return false;
            }
        }
        return true;
    };
}
function createLineMapper(libraryRoot) {
    const pathRegex = new RegExp((0, escapeStringRegexp_1.escapeStringRegexp)(libraryRoot) + "\\S*");
    return function lineMapper(line) {
        if (line.trimStart().startsWith("at ")) {
            const parts = line.trimStart().split(" ");
            if (parts.length === 4) {
                // Cleanup our own stack traces
                // Examples
                // at Object.unifiedUsers (/Users/hansott/Code/my-project/server/src/GraphQL/Mutation.ts:4491:31) /Users/hansott/Code/my-project/server/node_modules/@aikidosec/firewall
                return line.replace(pathRegex, "");
            }
        }
        return line;
    };
}