bridge: Add back support for x.min.js files

We removed support for `.min.` filenames because we thought that nobody
was using it anymore, but there are still external packages that make
use of it.

Add it back again, but only for the case where the non-minified version
isn't present.  The minified version can always be explicitly requested
via its full filename (minus `.gz`, if applicable).

Add a bit of debugging output and some test cases to make sure we handle
the combinations properly.

Fixes https://issues.redhat.com/browse/RHEL-18861

src/cockpit/packages.py

@@ -266,11 +266,22 @@ def ensure_scanned(self) -> None:
                 # Accept-Language is case-insensitive and uses '-' to separate variants
                 lower_locale = locale.lower().replace('_', '-')
 
+                logger.debug('Adding translation %r %r -> %r', basename, lower_locale, name)
                 self.translations[f'{basename}.js'][lower_locale] = name
             else:
-                basename = name[:-3] if name.endswith('.gz') else name
+                # strip out trailing '.gz' components
+                basename = re.sub('.gz$', '', name)
+                logger.debug('Adding content %r -> %r', basename, name)
                 self.files[basename] = name
 
+                # If we see a filename like `x.min.js` we want to also offer it
+                # at `x.js`, but only if `x.js(.gz)` itself is not present.
+                # Note: this works for both the case where we found the `x.js`
+                # first (it's already in the map) and also if we find it second
+                # (it will be replaced in the map by the line just above).
+                # See https://github.com/cockpit-project/cockpit/pull/19716
+                self.files.setdefault(basename.replace('.min.', '.'), name)
+
         # support old cockpit-po-plugin which didn't write po.manifest.??.js
         if not self.translations['po.manifest.js']:
             self.translations['po.manifest.js'] = self.translations['po.js']

test/pytest/test_packages.py

@@ -239,3 +239,49 @@ def test_translation(pkgdir):
     assert b'eins\n' in contents
     assert b'zwo\n' in contents
     assert b'zwei\n' not in contents
+
+
+def test_filename_mangling(pkgdir):
+    make_package(pkgdir, 'one')
+
+    # test various filename variations
+    (pkgdir / 'one' / 'one.js').write_text('this is one.js')
+    (pkgdir / 'one' / 'two.js.gz').write_text('this is two.js')
+    (pkgdir / 'one' / 'three.min.js.gz').write_text('this is three.js')
+    (pkgdir / 'one' / 'four.min.js').write_text('this is four.js')
+
+    packages = Packages()
+    encodings = set()
+
+    for name in ['one', 'two', 'three', 'four']:
+        document = packages.load_path(f'/one/{name}.js', {})
+        assert document.data.read().decode() == f'this is {name}.js'
+        assert '/javascript' in document.content_type
+        encodings.add(document.content_encoding)
+
+    assert encodings == {None, 'gzip'}  # make sure we saw both compressed and uncompressed
+
+
+def test_overlapping_minified(pkgdir):
+    make_package(pkgdir, 'one')
+    (pkgdir / 'one' / 'one.min.js').write_text('min')
+    (pkgdir / 'one' / 'one.js').write_text('max')
+
+    # try the other way around in hope of listing the files in reverse order
+    (pkgdir / 'one' / 'two.js').write_text('max')
+    (pkgdir / 'one' / 'two.min.js').write_text('min')
+
+    packages = Packages()
+
+    # if both files are present, we should find the original one
+    document = packages.load_path('/one/one.js', {})
+    assert document.data.read().decode() == 'max'
+    document = packages.load_path('/one/two.js', {})
+    assert document.data.read().decode() == 'max'
+
+    # but requesting .min. explicitly will load it
+    document = packages.load_path('/one/one.min.js', {})
+    assert document.data.read().decode() == 'min'
+    document = packages.load_path('/one/two.min.js', {})
+    assert document.data.read().decode() == 'min'
+