fix(utils): dirname and basename should handle Windows paths (#8737)

The Electron SDK uses `basename` to get the file name without path but
this returned the full path on Windows.

This PR adds Windows support to the regex and adds some tests.

packages/utils/src/path.ts

@@ -51,10 +51,13 @@ function normalizeArray(parts: string[], allowAboveRoot?: boolean): string[] {
 
 // Split a filename into [root, dir, basename, ext], unix version
 // 'root' is just a slash, or nothing.
-const splitPathRe = /^(\/?|)([\s\S]*?)((?:\.{1,2}|[^/]+?|)(\.[^./]*|))(?:[/]*)$/;
+const splitPathRe = /^(\S+:\\|\/?)([\s\S]*?)((?:\.{1,2}|[^/\\]+?|)(\.[^./\\]*|))(?:[/\\]*)$/;
 /** JSDoc */
 function splitPath(filename: string): string[] {
-  const parts = splitPathRe.exec(filename);
+  // Truncate files names greater than 1024 characters to avoid regex dos
+  // https://github.com/getsentry/sentry-javascript/pull/8737#discussion_r1285719172
+  const truncated = filename.length > 1024 ? `<truncated>${filename.slice(-1024)}` : filename;
+  const parts = splitPathRe.exec(truncated);
   return parts ? parts.slice(1) : [];
 }
 

packages/utils/test/path.test.ts

@@ -0,0 +1,33 @@
+import { basename, dirname } from '../src/path';
+
+describe('path', () => {
+  describe('basename', () => {
+    test('unix', () => {
+      expect(basename('/foo/bar/baz/asdf/quux.html')).toEqual('quux.html');
+      expect(basename('foo/bar/baz/asdf/quux.html')).toEqual('quux.html');
+      expect(basename('../baz/asdf/quux.html')).toEqual('quux.html');
+      expect(basename('quux.html')).toEqual('quux.html');
+    });
+    test('windows', () => {
+      expect(basename('c:\\foo\\bar\\baz\\asdf\\quux.html')).toEqual('quux.html');
+      expect(basename('\\foo\\bar\\baz\\asdf\\quux.html')).toEqual('quux.html');
+      expect(basename('..\\bar\\baz\\asdf\\quux.html')).toEqual('quux.html');
+      expect(basename('quux.html')).toEqual('quux.html');
+    });
+  });
+
+  describe('dirname', () => {
+    test('unix', () => {
+      expect(dirname('/foo/bar/baz/asdf/quux.html')).toEqual('/foo/bar/baz/asdf');
+      expect(dirname('foo/bar/baz/asdf/quux.html')).toEqual('foo/bar/baz/asdf');
+      expect(dirname('../baz/asdf/quux.html')).toEqual('../baz/asdf');
+      expect(dirname('/quux.html')).toEqual('/');
+    });
+    test('windows', () => {
+      expect(dirname('C:\\foo\\bar\\baz\\asdf\\quux.html')).toEqual('C:\\foo\\bar\\baz\\asdf');
+      expect(dirname('\\foo\\bar\\baz\\asdf\\quux.html')).toEqual('\\foo\\bar\\baz\\asdf');
+      expect(dirname('..\\bar\\baz\\asdf\\quux.html')).toEqual('..\\bar\\baz\\asdf');
+      expect(dirname('quux.html')).toEqual('.');
+    });
+  });
+});