feat(ng-dev): validate all licenses as being allowed for our Angular projects

bazel/esbuild/index.bzl

@@ -28,7 +28,7 @@ def esbuild_esm_bundle(name, **kwargs):
     """
 
     args = dict(
-        resolveExtensions = [".mjs", ".js"],
+        resolveExtensions = [".mjs", ".js", ".json"],
         outExtension = {".js": ".mjs"},
         # Workaround for: https://github.com/evanw/esbuild/issues/1921.
         banner = {

ng-dev/misc/BUILD.bazel

@@ -5,6 +5,7 @@ ts_library(
     srcs = glob(["**/*.ts"]),
     visibility = ["//ng-dev:__subpackages__"],
     deps = [
+        "//ng-dev/misc/validate-licenses",
         "//ng-dev/release/build",
         "//ng-dev/release/config",
         "//ng-dev/utils",

ng-dev/misc/cli.ts

@@ -10,6 +10,7 @@ import {Argv} from 'yargs';
 import {BuildAndLinkCommandModule} from './build-and-link/cli.js';
 import {NewMainBranchCommandModule} from './new-main-branch/cli.js';
 import {UpdateYarnCommandModule} from './update-yarn/cli.js';
+import {ValidateLicensesModule} from './validate-licenses/cli.js';
 
 /** Build the parser for the misc commands. */
 export function buildMiscParser(localYargs: Argv) {
@@ -18,5 +19,6 @@ export function buildMiscParser(localYargs: Argv) {
     .strict()
     .command(BuildAndLinkCommandModule)
     .command(NewMainBranchCommandModule)
-    .command(UpdateYarnCommandModule);
+    .command(UpdateYarnCommandModule)
+    .command(ValidateLicensesModule);
 }

ng-dev/misc/validate-licenses/BUILD.bazel

@@ -0,0 +1,16 @@
+load("//tools:defaults.bzl", "ts_library")
+
+ts_library(
+    name = "validate-licenses",
+    srcs = glob(["*.ts"]),
+    visibility = ["//ng-dev/misc:__pkg__"],
+    deps = [
+        "//ng-dev/utils",
+        "@npm//@types/license-checker",
+        "@npm//@types/node",
+        "@npm//@types/spdx-satisfies",
+        "@npm//@types/yargs",
+        "@npm//license-checker",
+        "@npm//spdx-satisfies",
+    ],
+)

ng-dev/misc/validate-licenses/cli.ts

@@ -0,0 +1,59 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {Argv, Arguments, CommandModule} from 'yargs';
+import {Log, green, red} from '../../utils/logging.js';
+import {determineRepoBaseDirFromCwd} from '../../utils/repo-directory.js';
+
+import {checkAllLicenses} from './validate.js';
+
+/** Command line options. */
+export interface Options {}
+
+/** Yargs command builder for the command. */
+function builder(argv: Argv): Argv<Options> {
+  return argv;
+}
+
+/** Yargs command handler for the command. */
+async function handler({}: Arguments<Options>) {
+  try {
+    const {valid, maxPkgNameLength, packages} = await checkAllLicenses(
+      determineRepoBaseDirFromCwd(),
+    );
+    if (valid) {
+      Log.info(
+        `  ${green('✓')}  All discovered licenses comply with our restrictions (${
+          packages.length
+        } packages)`,
+      );
+      return;
+    }
+
+    Log.info(red(' ✘ The following packages were found to have disallowed licenses:\n'));
+    Log.info(`${'     Package Name'.padEnd(maxPkgNameLength)}     |      LICENSE`);
+    packages
+      .filter((pkg) => !pkg.allowed)
+      .forEach((pkg) => {
+        Log.info(`  - ${pkg.name.padEnd(maxPkgNameLength)} | ${pkg.licenses}`);
+      });
+    process.exitCode = 1;
+  } catch (err) {
+    Log.info(red(' ✘ An error occured while processing package licenses:'));
+    Log.error(err);
+    process.exitCode = 1;
+  }
+}
+
+/** CLI command module. */
+export const ValidateLicensesModule: CommandModule<{}, Options> = {
+  builder,
+  handler,
+  command: 'validate-licenses',
+  describe: 'Validate the licenses for all dependencies in the project',
+};

ng-dev/misc/validate-licenses/validate.ts

@@ -0,0 +1,122 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+import licenseChecker, {ModuleInfo, ModuleInfos} from 'license-checker';
+import spdx from 'spdx-satisfies';
+
+// A general note on some disallowed licenses:
+// - CC0
+//    This is not a valid license. It does not grant copyright of the code/asset, and does not
+//    resolve patents or other licensed work. The different claims also have no standing in court
+//    and do not provide protection to or from Google and/or third parties.
+//    We cannot use nor contribute to CC0 licenses.
+// - Public Domain
+//    Same as CC0, it is not a valid license.
+
+/** List of established allowed licenses for depdenencies. */
+const allowedLicenses = [
+  // Notice licenses
+  'MIT',
+  'ISC',
+  'Apache-2.0',
+  'Python-2.0',
+  'Artistic-2.0',
+  'BSD-2-Clause',
+  'BSD-3-Clause',
+  'BSD-4-Clause',
+  'Zlib',
+  'AFL-2.1',
+  'CC-BY-3.0',
+  'CC-BY-4.0',
+
+  // Unencumbered
+  'Unlicense',
+  'CC0-1.0',
+  '0BSD',
+];
+
+/** Known name variations of SPDX licenses. */
+const licenseReplacements = new Map<string, string>([
+  // Just a longer string that our script catches. SPDX official name is the shorter one.
+  ['Apache License, Version 2.0', 'Apache-2.0'],
+  ['Apache2', 'Apache-2.0'],
+  ['Apache 2.0', 'Apache-2.0'],
+  ['Apache v2', 'Apache-2.0'],
+
+  // Alternate syntax
+  ['AFLv2.1', 'AFL-2.1'],
+
+  // BSD is BSD-2-clause by default.
+  ['BSD', 'BSD-2-Clause'],
+]);
+
+interface ExpandedModuleInfo extends ModuleInfo {
+  name: string;
+  allowed: boolean;
+}
+
+export interface LicenseCheckResult {
+  valid: boolean;
+  packages: ExpandedModuleInfo[];
+  maxPkgNameLength: number;
+}
+
+export async function checkAllLicenses(start: string): Promise<LicenseCheckResult> {
+  return new Promise((resolve, reject) => {
+    let maxPkgNameLength = 0;
+    licenseChecker.init({start}, (err: Error, pkgInfoObject: ModuleInfos) => {
+      // If the license processor fails, reject the process with the error.
+      if (err) {
+        console.log('thats an error');
+        return reject(err);
+      }
+
+      // Check each package to ensure its license(s) are allowed.
+      const packages = Object.entries(pkgInfoObject).map<ExpandedModuleInfo>(
+        ([name, pkg]: [string, ModuleInfo]) => {
+          maxPkgNameLength = Math.max(maxPkgNameLength, name.length);
+          /**
+           * Array of licenses for the package.
+           *
+           * Note: Typically a package will only have one license, but support for multiple license
+           *       is necessary for full support.
+           */
+          const licenses = Array.isArray(pkg.licenses) ? pkg.licenses : [pkg.licenses!];
+
+          return {
+            ...pkg,
+            name,
+            allowed: licenses.some(assertAllowedLicense),
+          };
+        },
+      );
+
+      resolve({
+        valid: packages.every((pkg) => pkg.allowed),
+        packages,
+        maxPkgNameLength,
+      });
+    });
+  });
+}
+
+const allowedLicensesSpdxExpression = allowedLicenses.join(' OR ');
+// Check if a license is accepted by an array of accepted licenses
+function assertAllowedLicense(license: string) {
+  // Licenses which are determined based on a file other than LICENSE are have an * appended.
+  // See https://www.npmjs.com/package/license-checker#how-licenses-are-found
+  const strippedLicense = license.endsWith('*') ? license.slice(0, -1) : license;
+  try {
+    // If the license is included in the known replacements, use the replacement instead.
+    return spdx(
+      licenseReplacements.get(strippedLicense) ?? strippedLicense,
+      allowedLicensesSpdxExpression,
+    );
+  } catch {
+    return false;
+  }
+}

package.json

@@ -92,8 +92,10 @@
     "@types/inquirer": "9.0.1",
     "@types/jasmine": "^4.0.0",
     "@types/jsdom": "^20.0.0",
+    "@types/license-checker": "^25.0.3",
     "@types/opener": "^1.4.0",
     "@types/semver": "^7.3.6",
+    "@types/spdx-satisfies": "^0.1.0",
     "@types/supports-color": "^8.1.1",
     "@types/wait-on": "^5.3.1",
     "@types/which": "^2.0.1",
@@ -125,6 +127,7 @@
     "karma-jasmine-html-reporter": "~2.0.0",
     "karma-requirejs": "^1.1.0",
     "karma-sourcemap-loader": "^0.3.8",
+    "license-checker": "^25.0.1",
     "minimatch": "^5.0.0",
     "multimatch": "^6.0.0",
     "nock": "^13.0.3",
@@ -134,6 +137,7 @@
     "requirejs": "^2.3.6",
     "rxjs": "^7.4.0",
     "semver": "^7.3.5",
+    "spdx-satisfies": "^5.0.1",
     "supports-color": "9.2.2",
     "terser": "^5.14.1",
     "ts-node": "^10.8.1",