check-code-style.js

#!/usr/bin/env node

// eslint-disable-next-line @typescript-eslint/no-var-requires
const fs = require('fs');
// eslint-disable-next-line @typescript-eslint/no-var-requires
const path = require('path');
// eslint-disable-next-line @typescript-eslint/no-var-requires
const exec = require('child_process').execSync;

let exitCode = 0;

const ignoreMemo = {};
const isIgnored = (file) => {
  if (file in ignoreMemo) {
    return ignoreMemo[file];
  }
  try {
    // If this returns zero, it means the file is ignored by git; skip it.
    exec(`git check-ignore -q '${file}'`);
    ignoreMemo[file] = true;
    return true;
  } catch (e) {
    // It's tracked by git.
    ignoreMemo[file] = false;
    return false;
  }
};

const walk = (dir) => {
  let results = [];
  if (dir.includes('.DS_Store')) {
    return results;
  }

  const list = fs.readdirSync(dir);
  list.forEach(function (file) {
    file = dir + '/' + file;
    let stat = fs.statSync(file);
    if (stat && stat.isDirectory()) {
      results = results.concat(walk(file));
    } else {
      results.push(file);
    }
  });
  return results;
};

const failed = (file, reason, description) => {
  console.error('Failed:', file, reason);
  if (description) {
    console.error(description);
  }
  exitCode = 1;
};

const dirs = () => {
  return fs
    .readdirSync('src')
    .filter(
      dir =>
        path.basename(dir) !== 'tsconfig.json' &&
        path.basename(dir) !== 'index.ts' &&
        !path.basename(dir).startsWith('.') &&
        !path.basename(dir).includes('signalingprotocol') &&
        !path.basename(dir).includes('screensignalingprotocol') &&
        !path.basename(dir).includes('utils') &&
        !path.basename(dir).includes('cspmonitor')
    );
};

const tests = () => {
  return walk('test')
    .filter(file => file.endsWith('.test.ts'))
    .sort();
};

const allFiles = () => {
  const srcFiles = walk('src').filter(
    file => file.endsWith('.ts') && path.basename(file) !== 'index.ts'
  );
  const testFiles = walk('test').filter(file => file.endsWith('.ts'));
  const demosFiles = walk('demos/browser/app').filter(
    file => file.endsWith('.ts') || file.endsWith('.js')
  );
  return srcFiles.concat(testFiles).concat(demosFiles);
};

tests().forEach(file => {
  if (file === 'test/global/Global.test.ts') {
    return;
  }

  if (isIgnored(file)) {
    return;
  }

  const fileText = fs.readFileSync(file, 'utf-8').toString();
  if (fileText.includes('not.equal.null')) {
    failed(
      file,
      'contains not.equal.null',
      'Avoid using not.equal.null and convert it to assert.exists'
    );
  }

  const basename = path.basename(file, '.test.ts');
  let describeCount = 0;

  const lines = fileText.split('\n');
  for (let i = 0; i < lines.length; i++) {
    if (lines[i].match(/^describe\(/)) {
      ++describeCount;
    }
  }
  if (describeCount !== 1) {
    const errorString = 'Ensure that each test file has one top-level describe';
    failed(file, 'has more than one top-level describe', errorString);
  }
});

const isDirIgnoredForInterfaceCheck = (dir) => {
  return ['applicationmetadata'].includes(dir);
};

const isFileIgnoredForInterfaceCheck = (file) => {
  return ['SDP.ts', 'StatsCollector.ts', 'ClientMetricReport.ts'].includes(file);
};

dirs().forEach(dir => {
  if (isIgnored(dir)) {
    return;
  }

  if (isDirIgnoredForInterfaceCheck(dir)) {
    return;
  }

  const dirPath = path.join('src', dir);
  fs.readdirSync(dirPath).forEach(file => {
    if (isFileIgnoredForInterfaceCheck(file)) {
      return;
    }

    let filePath = path.join(dirPath, file);
    if (path.basename(filePath, '.ts').toLowerCase() !== path.basename(dirPath)) {
      // not a interface
      return;
    }
    let fileText = fs.readFileSync(filePath, 'utf-8').toString();

    // Ignore comment lines, so you can have a block comment followed by ts-ignore.
    let lines = fileText.split('\n').filter(s => !(s.match(/^\s*\/\//)));
    for (let i = 0; i < lines.length; i++) {
      if (lines[i].trim()[0] !== '*') {
        let commentStartRegex = new RegExp(/\s+\w+\(.*[:]/);
        if (commentStartRegex.test(lines[i])) {
          if (lines[i - 1].trim() !== '*/') {
            failed(
              dir,
              `interface ${file} method ${lines[i].trim()} is missing comment`,
              'Ensure that each interface method has a comment explaining what it does and information about the possible inputs and expected outputs.'
            );
          }
        }
      }
    }
  });
});

const spdx = '// SPDX-License-Identifier: Apache-2.0';

let allYears = [];

allFiles().forEach(file => {
  if (file.endsWith('.d.ts') || isIgnored(file)) {
    return;
  }

  const copyright = `// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.`;
  const fileLines = fs
    .readFileSync(file)
    .toString()
    .split('\n');

  if (fileLines[0].trim() !== copyright) {
    failed(
      `${file}:1`,
      'header does not include correct copyright',
      `Ensure that header contains the following copyright: ${copyright}`
    );
  }

  if (fileLines[1].trim() !== spdx) {
    failed(
      `${file}:1`,
      'header does not include correct SPDX license code',
      `Ensure that header contains the following copyright: ${spdx}`
    );
  }

  if (fileLines[2].trim() !== '') {
    failed(
      `${file}:3`,
      'copyright file header is not followed by blank line',
      'Ensure that header is followed by a blank line'
    );
  }

  for (let i = 0; i < fileLines.length; i++) {
    const pos = `${file}:${i + 1}`;

    // Exclude demos and comment lines. Some of our block comments
    // include code examples that refer to console.log.
    if (fileLines[i].includes('console.log') &&
      !fileLines[i].match(/^\s+(?:\*|\/[\*\/])/) &&
      !file.includes('demos/')) {
      failed(pos, 'contains console.log: ' + fileLines[i], 'Ensure that source does not contain console.log');
    }
  }
});

const footerCopyright = `\nCopyright Amazon.com, Inc. or its affiliates. All Rights Reserved.\n`;

for (const file of ['README.md', 'NOTICE']) {
  if (
    !fs
      .readFileSync(file)
      .toString()
      .endsWith(footerCopyright)
  ) {
    failed(file, `Ensure that ${file} ends with the following copyright: ${footerCopyright}`);
  }
}

process.exit(exitCode);