From c2954db659b3989ac13056d5527970510ea647c7 Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Fri, 22 Mar 2024 20:08:00 +0200
Subject: [PATCH] gh-117084: Fix ZIP file extraction for directory entry names
 with backslashes on Windows (GH-117129)

---
 Lib/test/archivetestdata/zipdir_backslash.zip   | Bin 0 -> 192 bytes
 Lib/test/test_zipfile/test_core.py              |  16 ++++++++++++++++
 Lib/zipfile/__init__.py                         |  10 +++++++++-
 ...24-03-21-17-07-38.gh-issue-117084.w1mTpT.rst |   2 ++
 4 files changed, 27 insertions(+), 1 deletion(-)
 create mode 100644 Lib/test/archivetestdata/zipdir_backslash.zip
 create mode 100644 Misc/NEWS.d/next/Library/2024-03-21-17-07-38.gh-issue-117084.w1mTpT.rst

diff --git a/Lib/test/archivetestdata/zipdir_backslash.zip b/Lib/test/archivetestdata/zipdir_backslash.zip
new file mode 100644
index 0000000000000000000000000000000000000000..979126ef5e37ebd46762c76439e9b4e77431103c
GIT binary patch
literal 192
zcmWIWW@Zs#0D<Gpr4e8TlwbwYi7`nr$pLUBLM^CDSb$1WVp3xQycwB97;qZ{F;M|R
f!3;%c!DcK%i!zW2v4oWkB+3MYsX*El#9;sc%<2+!

literal 0
HcmV?d00001

diff --git a/Lib/test/test_zipfile/test_core.py b/Lib/test/test_zipfile/test_core.py
index 368e60a37b05557..a605aa1f14fe3f6 100644
--- a/Lib/test/test_zipfile/test_core.py
+++ b/Lib/test/test_zipfile/test_core.py
@@ -2937,6 +2937,22 @@ def test_bug_6050(self):
         os.mkdir(os.path.join(TESTFN2, "a"))
         self.test_extract_dir()
 
+    def test_extract_dir_backslash(self):
+        zfname = findfile("zipdir_backslash.zip", subdir="archivetestdata")
+        with zipfile.ZipFile(zfname) as zipf:
+            zipf.extractall(TESTFN2)
+        if os.name == 'nt':
+            self.assertTrue(os.path.isdir(os.path.join(TESTFN2, "a")))
+            self.assertTrue(os.path.isdir(os.path.join(TESTFN2, "a", "b")))
+            self.assertTrue(os.path.isfile(os.path.join(TESTFN2, "a", "b", "c")))
+            self.assertTrue(os.path.isdir(os.path.join(TESTFN2, "d")))
+            self.assertTrue(os.path.isdir(os.path.join(TESTFN2, "d", "e")))
+        else:
+            self.assertTrue(os.path.isfile(os.path.join(TESTFN2, "a\\b\\c")))
+            self.assertTrue(os.path.isfile(os.path.join(TESTFN2, "d\\e\\")))
+            self.assertFalse(os.path.exists(os.path.join(TESTFN2, "a")))
+            self.assertFalse(os.path.exists(os.path.join(TESTFN2, "d")))
+
     def test_write_dir(self):
         dirpath = os.path.join(TESTFN2, "x")
         os.mkdir(dirpath)
diff --git a/Lib/zipfile/__init__.py b/Lib/zipfile/__init__.py
index cc08f602fe44e05..b330ece4b276ad7 100644
--- a/Lib/zipfile/__init__.py
+++ b/Lib/zipfile/__init__.py
@@ -605,7 +605,15 @@ def from_file(cls, filename, arcname=None, *, strict_timestamps=True):
 
     def is_dir(self):
         """Return True if this archive member is a directory."""
-        return self.filename.endswith('/')
+        if self.filename.endswith('/'):
+            return True
+        # The ZIP format specification requires to use forward slashes
+        # as the directory separator, but in practice some ZIP files
+        # created on Windows can use backward slashes.  For compatibility
+        # with the extraction code which already handles this:
+        if os.path.altsep:
+            return self.filename.endswith((os.path.sep, os.path.altsep))
+        return False
 
 
 # ZIP encryption uses the CRC32 one-byte primitive for scrambling some
diff --git a/Misc/NEWS.d/next/Library/2024-03-21-17-07-38.gh-issue-117084.w1mTpT.rst b/Misc/NEWS.d/next/Library/2024-03-21-17-07-38.gh-issue-117084.w1mTpT.rst
new file mode 100644
index 000000000000000..6e7790e926b9d2b
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2024-03-21-17-07-38.gh-issue-117084.w1mTpT.rst
@@ -0,0 +1,2 @@
+Fix :mod:`zipfile` extraction for directory entries with the name containing
+backslashes on Windows.