Fixed #34194 -- Added django.utils.http.content_disposition_header().

django/http/response.py

@@ -8,7 +8,7 @@ import sys
 import time
 from email.header import Header
 from http.client import responses
-from urllib.parse import quote, urlparse
+from urllib.parse import urlparse
 
 from django.conf import settings
 from django.core import signals, signing
@@ -18,7 +18,7 @@ from django.http.cookie import SimpleCookie
 from django.utils import timezone
 from django.utils.datastructures import CaseInsensitiveMapping
 from django.utils.encoding import iri_to_uri
-from django.utils.http import http_date
+from django.utils.http import content_disposition_header, http_date
 from django.utils.regex_helper import _lazy_re_compile
 
 _charset_from_content_type_re = _lazy_re_compile(
@@ -569,20 +569,10 @@ class FileResponse(StreamingHttpResponse):
             else:
                 self.headers["Content-Type"] = "application/octet-stream"
 
-        if filename:
-            disposition = "attachment" if self.as_attachment else "inline"
-            try:
-                filename.encode("ascii")
-                file_expr = 'filename="{}"'.format(
-                    filename.replace("\\", "\\\\").replace('"', r"\"")
-                )
-            except UnicodeEncodeError:
-                file_expr = "filename*=utf-8''{}".format(quote(filename))
-            self.headers["Content-Disposition"] = "{}; {}".format(
-                disposition, file_expr
-            )
-        elif self.as_attachment:
-            self.headers["Content-Disposition"] = "attachment"
+        if content_disposition := content_disposition_header(
+            self.as_attachment, filename
+        ):
+            self.headers["Content-Disposition"] = content_disposition
 
 
 class HttpResponseRedirectBase(HttpResponse):

django/utils/http.py

@@ -10,6 +10,7 @@ from urllib.parse import (
     _coerce_args,
     _splitnetloc,
     _splitparams,
+    quote,
     scheme_chars,
     unquote,
 )
@@ -425,3 +426,24 @@ def parse_header_parameters(line):
                 value = unquote(value, encoding=encoding)
             pdict[name] = value
     return key, pdict
+
+
+def content_disposition_header(as_attachment, filename):
+    """
+    Construct a Content-Disposition HTTP header value from the given filename
+    as specified by RFC 6266.
+    """
+    if filename:
+        disposition = "attachment" if as_attachment else "inline"
+        try:
+            filename.encode("ascii")
+            file_expr = 'filename="{}"'.format(
+                filename.replace("\\", "\\\\").replace('"', r"\"")
+            )
+        except UnicodeEncodeError:
+            file_expr = "filename*=utf-8''{}".format(quote(filename))
+        return f"{disposition}; {file_expr}"
+    elif as_attachment:
+        return "attachment"
+    else:
+        return None