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fix(server): escape quotes in Content-Disposition ASCII filename

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Quotes in filenames would cause malformed Content-Disposition headers:
  filename="file"name.png"  ← Invalid header with unbalanced quotes

Now quotes are replaced with single quotes in the ASCII fallback while
the UTF-8 filename* uses proper percent-encoding (%22).
This commit is contained in:
RUiNtheExtinct 2025-12-28 14:33:54 +05:30
parent a3324e2b23
commit 99624cd2eb
2 changed files with 9 additions and 3 deletions
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2
server.py
View File

@ -200,6 +200,8 @@ def create_content_disposition_header(filename: str) -> str:
"""
# ASCII-safe filename for legacy clients (replace non-ASCII with ?)
ascii_filename = filename.encode('ascii', 'replace').decode('ascii')
# Escape quotes to prevent malformed header (e.g., filename="file"name.png")
ascii_filename = ascii_filename.replace('"', "'")
# RFC 5987 percent-encoded filename for UTF-8 support
encoded_filename = quote(filename, safe='')
return f"attachment; filename=\"{ascii_filename}\"; filename*=UTF-8''{encoded_filename}"

10
tests-unit/server_test/test_content_disposition.py
View File

@ -15,6 +15,8 @@ def create_content_disposition_header(filename: str) -> str:
"""
# ASCII-safe filename for legacy clients (replace non-ASCII with ?)
ascii_filename = filename.encode('ascii', 'replace').decode('ascii')
# Escape quotes to prevent malformed header (e.g., filename="file"name.png")
ascii_filename = ascii_filename.replace('"', "'")
# RFC 5987 percent-encoded filename for UTF-8 support
encoded_filename = quote(filename, safe='')
return f"attachment; filename=\"{ascii_filename}\"; filename*=UTF-8''{encoded_filename}"
@ -80,12 +82,14 @@ class TestContentDispositionHeader:
def test_filename_with_quotes(self):
"""Test that quotes in filename don't break the header."""
# Note: Quotes in filenames are edge cases but should not crash
# Quotes in filenames must be escaped to prevent malformed headers
result = create_content_disposition_header('file"name.png')
assert result.startswith("attachment;")
# The function should still produce valid output
assert "filename*=UTF-8''" in result
# Quotes should be replaced with single quotes in ASCII fallback
assert "filename=\"file'name.png\"" in result
# UTF-8 version should have percent-encoded quote
assert "filename*=UTF-8''file%22name.png" in result
def test_mixed_ascii_unicode(self):
"""Test filenames with both ASCII and Unicode characters."""