Repository: yt-dlp/yt-dlp
Pull request #2023 (2021-12-17 09:37:03)

Update headers to resist fingerprinting
Update our Chrome version and drop the nearly-obsolete Accept-Charset header that no browser emits any more.

Related: ytdl-org/youtube-dl#30394

<details> <summary> Boilerplate (improvement, mixed origin) </summary>

### In order to be accepted and merged into yt-dlp each piece of code must be in public domain or released under [Unlicense](http://unlicense.org/). Check one of the following options:
- I am the original author of this code and I am willing to release it under [Unlicense](http://unlicense.org/)
- I am not the original author of this code but it is in public domain or released under [Unlicense](http://unlicense.org/) (provide reliable evidence)

### What is the purpose of your *pull request*?
- Improvement

</details>

pukkandan: Is there any particular website where this is currently useful? or just a precautionary measure?

As for the useragents, we would ideally want it to be auto-generated at release. I believe @nao20010128nao has an implementation in ytdl-patched
fstirlitz: Precautionary; the problem with fingerprinting is that it can be very hard to establish definitively. But I think those two headers are particularly easy tells.
pukkandan: > Is there any particular website where this is currently useful?

I should have been more clear. What I meant to ask was if there is any supported site that we know to throttle/block based on these headers.

Since that seems to not be the case, I think we can wait on merging this till we implement the auto-generation of UA as well. Or, would you prefer I merge this first and we work on that in a separate PR? I don't mind either way
fstirlitz: Since we have not come to an agreement how to generate those version number lists automatically, I think this PR can be merged in the meantime, since it’s already written. Who knows how long that better solution will take.
dirkf: Apparently some sites (fronted by Cloudflare, I think) fail with the encyclopaedic UA generated in yt-dl, and presumably yt-dlp also. It might be considered to send a Safari or FF UA instead (or in the long term, a generic `Mozilla/5.0 ({platform}) (like Gecko)`, since detailed UA strings are to be deprecated).

Patch:
diff --git a/README.md b/README.md
index da0d9be9f..452ad9b22 100644
--- a/README.md
+++ b/README.md
@@ -1076,6 +1076,8 @@ # OUTPUT TEMPLATE
 
 1. **Alternatives**: Alternate fields can be specified seperated with a `,`. Eg: `%(release_date>%Y,upload_date>%Y|Unknown)s`
 
+1. **Replacement**: A replacement value can specified using a `&` separator. If the field is *not* empty, this replacement value will be used instead of the actual field content. This is done after alternate fields are considered; thus the replacement is used if *any* of the alternative fields is *not* empty.
+
 1. **Default**: A literal default value can be specified for when the field is empty using a `|` seperator. This overrides `--output-na-template`. Eg: `%(uploader|Unknown)s`
 
 1. **More Conversions**: In addition to the normal format types `diouxXeEfFgGcrs`, `B`, `j`, `l`, `q` can be used for converting to **B**ytes, **j**son (flag `#` for pretty-printing), a comma seperated **l**ist (flag `#` for `\n` newline-seperated) and a string **q**uoted for the terminal (flag `#` to split a list into different arguments), respectively
@@ -1084,7 +1086,7 @@ # OUTPUT TEMPLATE
 
 To summarize, the general syntax for a field is:
 ```
-%(name[.keys][addition][>strf][,alternate][|default])[flags][width][.precision][length]type
+%(name[.keys][addition][>strf][,alternate][&replacement][|default])[flags][width][.precision][length]type
 ```
 
 Additionally, you can set different output templates for the various metadata files separately from the general output template by specifying the type of file followed by the template separated by a colon `:`. The different file types supported are `subtitle`, `thumbnail`, `description`, `annotation` (deprecated), `infojson`, `link`, `pl_thumbnail`, `pl_description`, `pl_infojson`, `chapter`. For example, `-o '%(title)s.%(ext)s' -o 'thumbnail:%(title)s\%(title)s.%(ext)s'`  will put the thumbnails in a folder with the same name as the video. If any of the templates (except default) is empty, that type of file will not be written. Eg: `--write-thumbnail -o "thumbnail:"` will write thumbnails only for playlists and not for video.
@@ -1252,6 +1254,9 @@ # Download YouTube playlist videos in separate directory indexed by video order
 # Download YouTube playlist videos in separate directories according to their uploaded year
 $ yt-dlp -o '%(upload_date>%Y)s/%(title)s.%(ext)s' https://www.youtube.com/playlist?list=PLwiyx1dc3P2JR9N8gQaQN_BCvlSlap7re
 
+# Prefix playlist index with " - " separator, but only if it is available
+$ yt-dlp -o '%(playlist_index|)s%(playlist_index& - |)s%(title)s.%(ext)s' BaW_jenozKc https://www.youtube.com/user/TheLinuxFoundation/playlists
+
 # Download all playlists of YouTube channel/user keeping each playlist in separate directory:
 $ yt-dlp -o '%(uploader)s/%(playlist)s/%(playlist_index)s - %(title)s.%(ext)s' https://www.youtube.com/user/TheLinuxFoundation/playlists
 
diff --git a/yt_dlp/YoutubeDL.py b/yt_dlp/YoutubeDL.py
index 317526d10..ec69151d7 100644
--- a/yt_dlp/YoutubeDL.py
+++ b/yt_dlp/YoutubeDL.py
@@ -1055,7 +1055,8 @@ def prepare_outtmpl(self, outtmpl, info_dict, sanitize=None):
             (?P<fields>{field})
             (?P<maths>(?:{math_op}{math_field})*)
             (?:>(?P<strf_format>.+?))?
-            (?P<alternate>(?<!\\),[^|)]+)?
+            (?P<alternate>(?<!\\),[^|&)]+)?
+            (?:&(?P<replacement>.*?))?
             (?:\|(?P<default>.*?))?
             $'''.format(field=FIELD_RE, math_op=MATH_OPERATORS_RE, math_field=MATH_FIELD_RE))
 
@@ -1114,11 +1115,12 @@ def create_key(outer_mobj):
             key = outer_mobj.group('key')
             mobj = re.match(INTERNAL_FORMAT_RE, key)
             initial_field = mobj.group('fields').split('.')[-1] if mobj else ''
-            value, default = None, na
+            value, replacement, default = None, None, na
             while mobj:
                 mobj = mobj.groupdict()
                 default = mobj['default'] if mobj['default'] is not None else default
                 value = get_value(mobj)
+                replacement = mobj['replacement']
                 if value is None and mobj['alternate']:
                     mobj = re.match(INTERNAL_FORMAT_RE, mobj['alternate'][1:])
                 else:
@@ -1128,7 +1130,7 @@ def create_key(outer_mobj):
             if fmt == 's' and value is not None and key in field_size_compat_map.keys():
                 fmt = '0{:d}d'.format(field_size_compat_map[key])
 
-            value = default if value is None else value
+            value = default if value is None else value if replacement is None else replacement
 
             flags = outer_mobj.group('conversion') or ''
             str_fmt = f'{fmt[:-1]}s'
diff --git a/yt_dlp/utils.py b/yt_dlp/utils.py
index 9d4006051..81c95f3e9 100644
--- a/yt_dlp/utils.py
+++ b/yt_dlp/utils.py
@@ -97,1589 +97,50 @@ def register_socks_protocols():
 def random_user_agent():
     _USER_AGENT_TPL = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/%s Safari/537.36'
     _CHROME_VERSIONS = (
-        '74.0.3729.129',
-        '76.0.3780.3',
-        '76.0.3780.2',
-        '74.0.3729.128',
-        '76.0.3780.1',
-        '76.0.3780.0',
-        '75.0.3770.15',
-        '74.0.3729.127',
-        '74.0.3729.126',
-        '76.0.3779.1',
-        '76.0.3779.0',
-        '75.0.3770.14',
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-        '76.0.3778.1',
-        '76.0.3778.0',
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+        '90.0.4430.93',
+        '91.0.4472.101',
+        '91.0.4472.106',
+        '91.0.4472.114',
+        '91.0.4472.124',
+        '91.0.4472.164',
+        '91.0.4472.19',
+        '91.0.4472.77',
+        '92.0.4515.107',
+        '92.0.4515.115',
+        '92.0.4515.131',
+        '92.0.4515.159',
+        '92.0.4515.43',
+        '93.0.4556.0',
+        '93.0.4577.15',
+        '93.0.4577.63',
+        '93.0.4577.82',
+        '94.0.4606.41',
+        '94.0.4606.54',
+        '94.0.4606.61',
+        '94.0.4606.71',
+        '94.0.4606.81',
+        '94.0.4606.85',
+        '95.0.4638.17',
+        '95.0.4638.50',
+        '95.0.4638.54',
+        '95.0.4638.69',
+        '95.0.4638.74',
+        '96.0.4664.18',
+        '96.0.4664.45',
+        '96.0.4664.55',
+        '96.0.4664.93',
+        '97.0.4692.20',
     )
     return _USER_AGENT_TPL % random.choice(_CHROME_VERSIONS)
 
 
 std_headers = {
     'User-Agent': random_user_agent(),
-    'Accept-Charset': 'ISO-8859-1,utf-8;q=0.7,*;q=0.7',
     'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
     'Accept-Encoding': 'gzip, deflate',
     'Accept-Language': 'en-us,en;q=0.5',


Test patch:
diff --git a/test/test_YoutubeDL.py b/test/test_YoutubeDL.py
index 63ef50e1a..6c2530046 100644
--- a/test/test_YoutubeDL.py
+++ b/test/test_YoutubeDL.py
@@ -836,6 +836,11 @@ def gen():
         test('%(title3)s', ('foo/bar\\test', 'foo_bar_test'))
         test('folder/%(title3)s', ('folder/foo/bar\\test', 'folder%sfoo_bar_test' % os.path.sep))
 
+        # Replacement
+        test('%(id&foo)s.bar', 'foo.bar')
+        test('%(title&foo)s.bar', 'NA.bar')
+        test('%(title&foo|baz)s.bar', 'baz.bar')
+
     def test_format_note(self):
         ydl = YoutubeDL()
         self.assertEqual(ydl._format_note({}), '')