tools/pkglint/lib/packagejson.ts

import * as path from 'path';
import * as colors from 'colors/safe';
import * as fs from 'fs-extra';

// do not descend into these directories when searching for `package.json` files.
export const PKGLINT_IGNORES = ['node_modules', 'cdk.out', '.cdk.staging'];

/**
 * Return all package JSONs in the root directory
 */
export function findPackageJsons(root: string): PackageJson[] {
  const ret: PackageJson[] = [];

  function recurse(dir: string) {
    if (!fs.existsSync(dir)) {
      throw new Error('No such directory: ' + dir);
    }

    if (fs.existsSync(path.join(dir, '.no-packagejson-validator'))) {
      // Don't recurse here
      return;
    }

    for (const file of fs.readdirSync(dir)) {
      const fullPath = path.join(dir, file);
      if (file === 'package.json') {
        ret.push(new PackageJson(fullPath));
      }

      // Recurse into all dirs except ignored dirs
      if (!PKGLINT_IGNORES.includes(file) && (fs.lstatSync(fullPath)).isDirectory()) {
        recurse(fullPath);
      }
    }
  }

  recurse(root);
  return ret;
}

export type Fixer = () => void;

export interface Report {
  ruleName: string;

  message: string;

  fix?: Fixer;
}

/**
 * Class representing a package.json file and the issues we found with it
 */
export class PackageJson {
  public static fromDirectory(dir: string) {
    return new PackageJson(path.join(dir, 'package.json'));
  }

  public readonly json: { [key: string]: any };
  public readonly packageRoot: string;
  public readonly packageName: string;

  private readonly includeRules: RegExp[];
  private readonly excludeRules: RegExp[];

  private reports: Report[] = [];

  constructor(public readonly fullPath: string) {
    this.json = JSON.parse(fs.readFileSync(fullPath, { encoding: 'utf-8' }));
    this.packageRoot = path.dirname(path.resolve(fullPath));
    this.packageName = this.json.name;

    const disabled = this.json.pkglint && this.json.pkglint.ignore;
    this.includeRules = _forceArray(this.json.pkglint && this.json.pkglint.include) || [/^.*$/];
    this.excludeRules = _forceArray(this.json.pkglint && this.json.pkglint.exclude) || (disabled ? [/^.*$/] : []);

    function _forceArray(arg: string | string[] | undefined): RegExp[] | undefined {
      if (arg == null) { return arg; }
      if (Array.isArray(arg)) { return arg.map(_toRegExp); }
      return [_toRegExp(arg)];
    }

    function _toRegExp(pattern: string): RegExp {
      pattern = pattern.split('*').map(s => s.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')).join('.*');
      return new RegExp(`^${pattern}$`);
    }
  }

  public shouldApply(rule: ValidationRule): boolean {
    const included = this.includeRules.find(r => r.test(rule.name)) != null;
    const excluded = this.excludeRules.find(r => r.test(rule.name)) != null;
    return included && !excluded;
  }

  public save() {
    fs.writeJSONSync(this.fullPath, this.json, { encoding: 'utf-8', spaces: 2 });
  }

  public report(report: Report) {
    this.reports.push(report);
  }

  public get dependencies(): {[key: string]: string} {
    return this.json.dependencies || {};
  }

  public get devDependencies(): {[key: string]: string} {
    return this.json.devDependencies || {};
  }

  public get peerDependencies(): {[key: string]: string} {
    return this.json.peerDependencies || {};
  }

  public applyFixes() {
    const fixable = this.reports.filter(r => r.fix);
    const nonFixable = this.reports.filter(r => !r.fix);

    if (fixable.length > 0) {
      process.stderr.write(`${path.resolve(this.fullPath)}\n`);
    }

    for (const report of fixable) {
      process.stderr.write(`Fixing: ${report.message}\n`);
      report.fix!();
    }

    this.save();
    this.reports = nonFixable;
  }

  public displayReports(relativeTo: string) {
    if (this.hasReports) {
      process.stderr.write(`In package ${colors.blue(path.relative(relativeTo, this.fullPath))}\n`);
      this.reports.forEach(report => {
        process.stderr.write(`- [${colors.yellow(report.ruleName)}] ${report.message}${report.fix ? colors.green(' (fixable)') : ''}\n`);
      });
    }
  }

  public get hasReports() {
    return this.reports.length > 0;
  }

  /**
   * Return the NPM script with the given name
   */
  public npmScript(name: string): string {
    return (this.json.scripts || {})[name] || '';
  }

  /**
   * Apply a function the script
   *
   * If you want to change a script, use this to prevent multiple
   * fixes going { read, read, write, write } on the same script.
   */
  public changeNpmScript(name: string, fn: (script: string) => string) {
    const script = this.npmScript(name);

    if (!('scripts' in this.json)) {
      this.json.scripts = {};
    }
    this.json.scripts[name] = fn(script);
  }

  /**
   * Append a command to the given script, implicitly adding the '&&'
   */
  public appendToNpmScript(name: string, command: string) {
    if (!('scripts' in this.json)) {
      this.json.scripts = {};
    }

    const script = this.json.scripts[name] || '';
    if (script) {
      this.json.scripts[name] = script + ' && ' + command;
    } else {
      this.json.scripts[name] = command;
    }
  }

  /**
   * Return the version of the devDependency on `module`.
   */
  public getDevDependency(moduleOrPredicate: ((s: string) => boolean) | string): string | undefined {
    if (!('devDependencies' in this.json)) {
      return undefined;
    }

    const predicate: (s: string) => boolean = typeof(moduleOrPredicate) === 'string'
      ? x => x === moduleOrPredicate
      : moduleOrPredicate;

    const deps = this.json.devDependencies;
    const key = Object.keys(deps).find(predicate);
    return key !== undefined ? deps[key] : undefined;
  }

  /**
   * @param predicate the predicate to select dependencies to be extracted
   * @returns the list of dependencies matching a pattern.
   */
  public getDependencies(predicate: (s: string) => boolean): { name: string, version: string }[] {
    return Object.keys(this.json.dependencies || {}).filter(predicate).map(name => ({ name, version: this.json.dependencies[name] }));
  }

  /**
   * Adds a devDependency to the package.
   */
  public addDevDependency(module: string, version = '*') {
    if (!('devDependencies' in this.json)) {
      this.json.devDependencies = {};
    }

    this.json.devDependencies[module] = version;
  }

  /**
   * Adds a dependency to the package.
   */
  public addDependency(module: string, version = '*') {
    if (!('dependencies' in this.json)) {
      this.json.dependencies = {};
    }

    this.json.dependencies[module] = version;
  }

  public removeDevDependency(moduleOrPredicate: ((s: string) => boolean) | string) {
    if (!('devDependencies' in this.json)) {
      return;
    }

    const predicate: (s: string) => boolean = typeof(moduleOrPredicate) === 'string'
      ? x => x === moduleOrPredicate
      : moduleOrPredicate;

    for (const m of Object.keys(this.json.devDependencies)) {
      if (predicate(m)) {
        delete this.json.devDependencies[m];
      }
    }
  }

  public removeDependency(moduleOrPredicate: ((s: string) => boolean) | string) {
    if (!('dependencies' in this.json)) {
      return;
    }

    const predicate: (s: string) => boolean = typeof(moduleOrPredicate) === 'string'
      ? x => x === moduleOrPredicate
      : moduleOrPredicate;

    for (const m of Object.keys(this.json.dependencies)) {
      if (predicate(m)) {
        delete this.json.dependencies[m];
      }
    }
  }

  public addPeerDependency(module: string, version: string) {
    if (!('peerDependencies' in this.json)) {
      this.json.peerDependencies = {};
    }

    this.peerDependencies[module] = version;
  }

  /**
   * Whether the package-level file contains the given line
   */
  public fileContainsSync(fileName: string, line: string): boolean {
    const lines = this.readFileLinesSync(fileName);
    return lines.indexOf(line) !== -1;
  }

  /**
   * Whether the package-level file content is the given text
   */
  public fileIsSync(fileName: string, content: string): boolean {
    const data = this.readFileSync(fileName);
    return data === content;
  }

  /**
   * Add the given line to the package-level file
   */
  public addToFileSync(fileName: string, line: string) {
    const lines = this.readFileLinesSync(fileName);
    if (lines.indexOf(line) === -1) {
      lines.push(line);
      this.writeFileLinesSync(fileName, lines);
    }
  }

  public removeFromFileSync(fileName: string, line: string) {
    const lines = this.readFileLinesSync(fileName).filter(l => l.trim() !== line);
    this.writeFileLinesSync(fileName, lines);
  }

  /**
   * Writes the given content into a file.
   * @param fileName the name of the package-level file to write.
   * @param content  the desired content of the file.
   */
  public writeFileSync(fileName: string, content: string) {
    const fullPath = path.join(this.packageRoot, fileName);
    fs.writeFileSync(fullPath, content, { encoding: 'utf-8' });
  }

  private readFileSync(fileName: string): string {
    const fullPath = path.join(this.packageRoot, fileName);
    if (!fs.existsSync(fullPath)) { return ''; }
    return fs.readFileSync(fullPath, { encoding: 'utf-8' });
  }

  private readFileLinesSync(fileName: string): string[] {
    return this.readFileSync(fileName).split('\n');
  }

  private writeFileLinesSync(fileName: string, lines: string[]) {
    this.writeFileSync(fileName, lines.join('\n'));
  }
}

/**
 * Interface for validation rules
 */
export abstract class ValidationRule {
  public abstract readonly name: string;

  /**
   * Will be executed for every package definition once, used to collect statistics
   */
  public prepare(_pkg: PackageJson): void {
    // Nothing
  }

  /**
   * Will be executed for every package definition once, should mutate the package object
   */
  public abstract validate(pkg: PackageJson): void;
}