fix(diff-scope): a token that starts or ends with auth is an auth path; author* is not (review fix, GST-1065)

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

bin/gstack-diff-scope

@@ -128,16 +128,21 @@ _session_data() {
   return "$r"
 }
 
-# An auth path names auth as a word or path segment (GST-1065), split the way
-# lib/review-risk.ts tokens() splits it: camelCase, then every non-alphanumeric
-# run. auth, authn, authz, oauth, oauth2 and authenticat*/authoriz* match;
-# author-spec.md, AUTHORS and authority.ts do not.
+# An auth path holds a token, split the way lib/review-risk.ts tokens() splits
+# paths (camelCase, then every non-alphanumeric run), that starts or ends with
+# auth (GST-1065): auth.ts, /auth/, authn, authz, auth0, authguard, oauth,
+# basicauth, nextauth, oauth2 and authorize match; a token starting with author
+# (author-spec.md, AUTHORS, authority.ts) does not unless it is authoriz*.
 _auth_path() {
   local s="$1" t r=1
   while [[ "$s" =~ ^(.*[a-z0-9])([A-Z].*)$ ]]; do s="${BASH_REMATCH[1]} ${BASH_REMATCH[2]}"; done
   shopt -s nocasematch
   for t in ${s//[^a-zA-Z0-9]/ }; do
-    case "$t" in auth|authn|authz|oauth|oauth2|authenticat*|authoriz*) r=0; break ;; esac
+    case "$t" in
+      authoriz*|oauth2) r=0; break ;;
+      author*) ;;
+      auth*|*auth) r=0; break ;;
+    esac
   done
   shopt -u nocasematch
   return "$r"

test/diff-scope.test.ts

@@ -233,9 +233,11 @@ describe('gstack-diff-scope', () => {
   }
 
   // Value: protects=real auth paths still raise SCOPE_AUTH after the word-boundary fix (negative controls for GST-1065);
-  //   fails_when=the boundary drops a segment, a separator, a camelCase name or an authn/authz/oauth spelling; why_new=GST-1065; seam=bin/gstack-diff-scope
+  //   fails_when=the boundary drops a segment, a separator, a camelCase name, an authn/authz/oauth spelling or a glued token (auth0, basicauth, nextauth);
+  //   why_new=GST-1065 and its review (the first word-only matcher dropped glued tokens the old glob caught); seam=bin/gstack-diff-scope
   for (const file of ['src/auth.ts', 'app/auth/login.rb', 'lib/oauth.ts', 'src/oauth2/token.ts', 'lib/authn/check.go', 'src/authz.py', 'src/authService.ts',
-    'src/useAuth.ts', 'lib/OAuthClient.ts', 'lib/authentication.rb', 'lib/authorization_policy.rb', 'src/Authorize.tsx', 'config/AUTH_KEYS.md', 'pkg/auth-middleware.go']) {
+    'src/useAuth.ts', 'lib/OAuthClient.ts', 'lib/authentication.rb', 'lib/authorization_policy.rb', 'src/Authorize.tsx', 'config/AUTH_KEYS.md', 'pkg/auth-middleware.go',
+    'lib/auth0.ts', 'src/basicauth.go', 'src/authguard.ts', 'lib/reauth.ts', 'pages/api/nextauth.ts', 'src/authtoken.ts', 'lib/preauth.rb', 'src/HTTPAuth.ts']) {
     test(`${file} is an auth path`, () => {
       expect(runScope(createRepo([file])).SCOPE_AUTH).toBe('true');
     });