feat: extract name from license file (#7530)

.changeset/rich-grapes-whisper.md

@@ -0,0 +1,6 @@
+---
+"@pnpm/license-scanner": minor
+"pnpm": minor
+---
+
+When the license field does not exist in `package.json` but a license file exists, try to match and extract the license name [#7530](https://github.com/pnpm/pnpm/pull/7530).

reviewing/license-scanner/src/getPkgInfo.ts

@@ -39,6 +39,65 @@ const LICENSE_FILES = [
   'MIT-LICENSE',
 ]
 
+/**
+ * @const
+ * List common license names
+ * Refer https://github.com/pivotal/LicenseFinder/blob/master/lib/license_finder/license/definitions.rb
+*/
+const LICENSE_NAMES = [
+  'Apache1_1',
+  'Apache-1.1',
+  'Apache 1.1',
+  'Apache2',
+  'Apache-2.0',
+  'Apache 2.0',
+  'BSD',
+  'BSD-4-Clause',
+  'CC01',
+  'CC0-1.0',
+  'CC0-1.0',
+  'CDDL1',
+  'CDDL-1.0',
+  'Common Development and Distribution License 1.0',
+  'EPL1',
+  'EPL-1.0',
+  'Eclipse Public License 1.0',
+  'GPLv2',
+  'GPL-2.0-only',
+  'GPLv3',
+  'GPL-3.0-only',
+  'ISC',
+  'LGPL',
+  'LGPL-3.0-only',
+  'LGPL2_1',
+  'LGPL-2.1-only',
+  'MIT',
+  'MPL1_1',
+  'MPL-1.1',
+  'Mozilla Public License 1.1',
+  'MPL2',
+  'MPL-2.0',
+  'Mozilla Public License 2.0',
+  'NewBSD',
+  'BSD-3-Clause',
+  'New BSD',
+  'OFL',
+  'OFL-1.1',
+  'SIL OPEN FONT LICENSE Version 1.1',
+  'Python',
+  'PSF-2.0',
+  'Python Software Foundation License',
+  'Ruby',
+  'SimplifiedBSD',
+  'BSD-2-Clause',
+  'Simplified BSD',
+  'WTFPL',
+  '0BSD',
+  'BSD Zero Clause License',
+  'Zlib',
+  'zlib/libpng license',
+]
+
 export interface LicenseInfo {
   name: string
   licenseFile?: string
@@ -126,10 +185,18 @@ async function parseLicense (
       } else {
         licenseContents = await readLicenseFileFromCafs(opts.cafsDir, licensePackageFileInfo as PackageFileInfo)
       }
+      const licenseContent = licenseContents?.toString('utf-8')
+      let name = 'Unknown'
+      if (licenseContent) {
+        const match = licenseContent.match(new RegExp(`\\b(${LICENSE_NAMES.join('|')})\\b`, 'igm'))
+        if (match) {
+          name = [...new Set(match)].join(' OR ')
+        }
+      }
 
       return {
-        name: 'Unknown',
-        licenseFile: licenseContents?.toString('utf-8'),
+        name,
+        licenseFile: licenseContent,
       }
     }
   }

reviewing/plugin-commands-licenses/test/__snapshots__/index.ts.snap

@@ -80,7 +80,7 @@ exports[`pnpm licenses: should correctly read LICENSE file with executable file
 │                              │         │ The Node.js \`util.deprecate()\` function with browser support                                           │
 │                              │         │ https://github.com/TooTallNate/util-deprecate                                                          │
 ├──────────────────────────────┼─────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────┤
-│ varstream                    │ Unknown │ Nicolas Froidure                                                                                       │
+│ varstream                    │ MIT     │ Nicolas Froidure                                                                                       │
 │                              │         │ Stream variables beetween 2 JavaScript threads (client/server, ipc, worker/main thread).               │
 │                              │         │ https://github.com/nfroidure/VarStream#readme                                                          │
 └──────────────────────────────┴─────────┴────────────────────────────────────────────────────────────────────────────────────────────────────────┘