#!/usr/bin/env node
/**
 * Secret-scanning CI gate.
 *
 * Walks `apps/`, `packages/`, `scripts/`, `prisma/`, `docs/` (recursively) and
 * the repository root (top-level files only) looking for hardcoded secrets:
 * GitHub PATs, GitLab PATs, AWS access keys, Stripe live keys, Slack tokens,
 * private-key PEM headers, JWT-shaped tokens, and high-entropy assignment
 * literals on lines that look like secret declarations.
 *
 * Findings on `.env.example` variants or test/fixture/mock/stub paths are
 * recorded as "reviewed" rather than failures. Lines that contain obvious
 * placeholder markers (`placeholder`, `example`, `your-`, `<...>`, `${...}`,
 * `xxxxx`, `dummy`, `REDACTED`, ...) are skipped entirely.
 *
 * Exit 1 on any real (non-reviewed) finding, 0 otherwise.
 */
import fs from "node:fs";
import path from "node:path";
import url from "node:url";

const RECURSIVE_ROOTS = ["apps", "packages", "scripts", "prisma", "docs"];

export const SKIP_DIR_NAMES = new Set([
  "node_modules",
  "dist",
  "build",
  "coverage",
  ".react-router",
  ".git",
  ".cache",
  "generated",
  ".next",
  ".turbo",
]);

const SKIP_FILE_SUFFIXES = [
  ".lock",
  "-lock.json",
  ".png",
  ".jpg",
  ".jpeg",
  ".svg",
  ".ico",
  ".webp",
  ".pdf",
];

const SKIP_FILE_NAMES = new Set(["pnpm-lock.yaml"]);

// Allowlisted env-example filenames whose findings are logged as reviewed.
const ALLOWLISTED_FILENAMES = new Set([
  ".env.example",
  ".env.local.example",
  ".env.production.example",
  ".env.fly.example",
  ".env.test",
]);

// Path segments (case-insensitive substring) that mark a file as a
// test/fixture/mock surface; findings inside are reviewed, not failures.
const ALLOWLISTED_PATH_SEGMENTS = ["test", "spec", "fixture", "mock", "stub"];

// Self-reference: this scanner file describes the patterns it scans for, so
// matches against its own source must be treated as reviewed.
const SELF_FILENAMES = new Set([
  "verify-secrets.mjs",
  "verify-secrets.test.mjs",
]);

// Placeholder markers that disqualify a line from being a real secret.
const PLACEHOLDER_MARKERS = [
  "placeholder",
  "example",
  "your-",
  "your_",
  "replace-with",
  "replace_with",
  "xxxxx",
  "dummy",
  "redacted",
  "changeme",
  "change-me",
  "change_me",
  "todo",
  "fixme",
];

export function lineHasPlaceholder(line) {
  const lower = line.toLowerCase();
  for (const marker of PLACEHOLDER_MARKERS) {
    if (lower.includes(marker)) return true;
  }
  if (/<[^>]+>/.test(line)) return true;
  if (/\{[^}]+\}/.test(line)) return true;
  if (line.includes("${")) return true;
  return false;
}

export const PATTERNS = [
  { id: "github-pat", regex: /\bghp_[A-Za-z0-9_]{20,}\b/g },
  { id: "github-fine-grained-pat", regex: /\bgithub_pat_[A-Za-z0-9_]{20,}\b/g },
  { id: "gitlab-pat", regex: /\bglpat-[A-Za-z0-9_-]{20,}\b/g },
  { id: "aws-access-key-id", regex: /\bAKIA[0-9A-Z]{16}\b/g },
  { id: "stripe-secret-live", regex: /\bsk_live_[A-Za-z0-9]{20,}\b/g },
  {
    id: "stripe-webhook-live",
    regex: /\bwhsec_[A-Za-z0-9]{20,}\b/g,
    requiresLineContains: "live",
  },
  { id: "slack-bot-token", regex: /\bxoxb-\d+-\d+-\d+-[A-Za-z0-9]+\b/g },
  {
    id: "private-key-header",
    regex: /-----BEGIN (?:RSA |EC |DSA |OPENSSH |PGP )?PRIVATE KEY-----/g,
  },
  {
    id: "jwt-like",
    regex:
      /\beyJ[A-Za-z0-9_-]{10,}\.eyJ[A-Za-z0-9_-]{10,}\.[A-Za-z0-9_-]{10,}\b/g,
  },
  {
    id: "generic-high-entropy-assignment",
    regex:
      /\b(?:password|secret|token|api_?key|webhook_secret)\s*[:=]\s*['"][A-Za-z0-9+/=_-]{32,}['"]/gi,
  },
];

export function isAllowlistedPath(absPath) {
  const basename = path.basename(absPath);
  if (SELF_FILENAMES.has(basename)) return true;
  if (ALLOWLISTED_FILENAMES.has(basename)) return true;
  const lower = absPath.toLowerCase();
  for (const seg of ALLOWLISTED_PATH_SEGMENTS) {
    if (lower.includes(seg)) return true;
  }
  return false;
}

export function scanText(text, { filename = "" } = {}) {
  const findings = [];
  const lines = text.split(/\r?\n/);
  for (let i = 0; i < lines.length; i += 1) {
    const line = lines[i];
    if (lineHasPlaceholder(line)) continue;
    for (const pattern of PATTERNS) {
      pattern.regex.lastIndex = 0;
      for (const match of line.matchAll(pattern.regex)) {
        if (
          pattern.requiresLineContains &&
          !line.toLowerCase().includes(pattern.requiresLineContains)
        ) {
          continue;
        }
        findings.push({
          file: filename,
          line: i + 1,
          patternId: pattern.id,
          match: match[0],
        });
      }
    }
  }
  return findings;
}

function shouldSkipFile(absPath) {
  const basename = path.basename(absPath);
  if (SKIP_FILE_NAMES.has(basename)) return true;
  const lower = basename.toLowerCase();
  for (const suffix of SKIP_FILE_SUFFIXES) {
    if (lower.endsWith(suffix)) return true;
  }
  return false;
}

function listFilesRecursive(dir) {
  if (!fs.existsSync(dir)) return [];
  const out = [];
  const stack = [dir];
  while (stack.length > 0) {
    const current = stack.pop();
    let entries;
    try {
      entries = fs.readdirSync(current, { withFileTypes: true });
    } catch {
      continue;
    }
    for (const entry of entries) {
      if (entry.isDirectory()) {
        if (SKIP_DIR_NAMES.has(entry.name)) continue;
        stack.push(path.join(current, entry.name));
      } else if (entry.isFile()) {
        const abs = path.join(current, entry.name);
        if (shouldSkipFile(abs)) continue;
        out.push(abs);
      }
    }
  }
  return out;
}

function listRootTopLevelFiles(root) {
  if (!fs.existsSync(root)) return [];
  const out = [];
  let entries;
  try {
    entries = fs.readdirSync(root, { withFileTypes: true });
  } catch {
    return [];
  }
  for (const entry of entries) {
    if (!entry.isFile()) continue;
    const abs = path.join(root, entry.name);
    if (shouldSkipFile(abs)) continue;
    out.push(abs);
  }
  return out;
}

export function collectFiles(root) {
  const files = [];
  for (const sub of RECURSIVE_ROOTS) {
    files.push(...listFilesRecursive(path.join(root, sub)));
  }
  files.push(...listRootTopLevelFiles(root));
  return files;
}

function truncate(value, max = 80) {
  if (value.length <= max) return value;
  return `${value.slice(0, max)}...`;
}

export function evaluate(root = process.cwd()) {
  const files = collectFiles(root);
  const real = [];
  const reviewed = [];
  for (const file of files) {
    let content;
    try {
      content = fs.readFileSync(file, "utf8");
    } catch {
      continue;
    }
    const findings = scanText(content, { filename: file });
    if (findings.length === 0) continue;
    const allowlisted = isAllowlistedPath(file);
    for (const finding of findings) {
      if (allowlisted) {
        reviewed.push(finding);
      } else {
        real.push(finding);
      }
    }
  }
  return {
    scanned: files.length,
    patterns: PATTERNS.length,
    real,
    reviewed,
  };
}

function formatFinding(finding, rootRel) {
  const rel = path.relative(rootRel, finding.file) || finding.file;
  return `${rel}:${finding.line}: ${finding.patternId} matched: ${truncate(finding.match)}`;
}

const isMain =
  import.meta.url === url.pathToFileURL(process.argv[1] ?? "").href;

/* eslint-disable no-console -- CLI reporter writes to stdout/stderr. */
if (isMain) {
  const root = process.cwd();
  const result = evaluate(root);
  if (result.real.length === 0) {
    console.log("PASS no secret-shaped strings found");
  } else {
    for (const finding of result.real) {
      console.error(`FAIL ${formatFinding(finding, root)}`);
    }
  }
  if (result.reviewed.length > 0) {
    for (const finding of result.reviewed) {
      console.log(`reviewed ${formatFinding(finding, root)}`);
    }
  }
  console.log(
    `\nSummary: scanned files: ${result.scanned}, patterns: ${result.patterns}, real: ${result.real.length}, reviewed: ${result.reviewed.length}`,
  );
  if (result.real.length > 0) {
    process.exit(1);
  }
}
/* eslint-enable no-console */