Fix filepath sanitization in `--print-to-file`

yt_dlp/YoutubeDL.py

@@ -1240,18 +1240,21 @@ class YoutubeDL(object):
         outtmpl, info_dict = self.prepare_outtmpl(outtmpl, info_dict, *args, **kwargs)
         return self.escape_outtmpl(outtmpl) % info_dict
 
-    def _prepare_filename(self, info_dict, tmpl_type='default'):
+    def _prepare_filename(self, info_dict, *, outtmpl=None, tmpl_type=None):
+        assert None in (outtmpl, tmpl_type), 'outtmpl and tmpl_type are mutually exclusive'
+        if outtmpl is None:
+            outtmpl = self.outtmpl_dict.get(tmpl_type or 'default', self.outtmpl_dict['default'])
         try:
-            outtmpl = self._outtmpl_expandpath(self.outtmpl_dict.get(tmpl_type, self.outtmpl_dict['default']))
+            outtmpl = self._outtmpl_expandpath(outtmpl)
             filename = self.evaluate_outtmpl(outtmpl, info_dict, True)
             if not filename:
                 return None
 
-            if tmpl_type in ('default', 'temp'):
+            if tmpl_type in ('', 'temp'):
                 final_ext, ext = self.params.get('final_ext'), info_dict.get('ext')
                 if final_ext and ext and final_ext != ext and filename.endswith(f'.{final_ext}'):
                     filename = replace_extension(filename, ext, final_ext)
-            else:
+            elif tmpl_type:
                 force_ext = OUTTMPL_TYPES[tmpl_type]
                 if force_ext:
                     filename = replace_extension(filename, force_ext, info_dict.get('ext'))
@@ -1267,10 +1270,12 @@ class YoutubeDL(object):
             self.report_error('Error in output template: ' + str(err) + ' (encoding: ' + repr(preferredencoding()) + ')')
             return None
 
-    def prepare_filename(self, info_dict, dir_type='', warn=False):
-        """Generate the output filename."""
-
-        filename = self._prepare_filename(info_dict, dir_type or 'default')
+    def prepare_filename(self, info_dict, dir_type='', *, outtmpl=None, warn=False):
+        """Generate the output filename"""
+        if outtmpl:
+            assert not dir_type, 'outtmpl and dir_type are mutually exclusive'
+            dir_type = None
+        filename = self._prepare_filename(info_dict, tmpl_type=dir_type, outtmpl=outtmpl)
         if not filename and dir_type not in ('', 'temp'):
             return ''
 
@@ -2767,7 +2772,7 @@ class YoutubeDL(object):
             self.to_stdout(self.evaluate_outtmpl(format_tmpl(tmpl), info_copy))
 
         for tmpl, file_tmpl in self.params['print_to_file'].get(key, []):
-            filename = self.evaluate_outtmpl(file_tmpl, info_dict)
+            filename = self.prepare_filename(info_dict, outtmpl=file_tmpl)
             tmpl = format_tmpl(tmpl)
             self.to_screen(f'[info] Writing {tmpl!r} to: {filename}')
             if self._ensure_dir_exists(filename):