deduplicate user-agent setting code

fetch_posts.py

@@ -4,7 +4,6 @@
 import sys
 import anyio
 import aiohttp
-import platform
 import pendulum
 import operator
 import aiosqlite
@@ -14,15 +13,9 @@ from pleroma import Pleroma
 from bs4 import BeautifulSoup
 from functools import partial
 from typing import Iterable, NewType
-from utils import shield, HandleRateLimits, suppress
+from utils import shield, HandleRateLimits, suppress, http_session_factory
 from third_party.utils import extract_post_content
 
-USER_AGENT = (
-	'pleroma-ebooks; '
-	f'{aiohttp.__version__}; '
-	f'{platform.python_implementation()}/{platform.python_version()}'
-)
-
 UTC = pendulum.timezone('UTC')
 JSON_CONTENT_TYPE = 'application/json'
 ACTIVITYPUB_CONTENT_TYPE = 'application/activity+json'
@@ -40,9 +33,8 @@ class PostFetcher:
 			Pleroma(api_base_url=self.config['site'], access_token=self.config['access_token']),
 		)
 		self._http = await stack.enter_async_context(
-			aiohttp.ClientSession(
+			http_session_factory(
 				headers={
-					'User-Agent': USER_AGENT,
 					'Accept': ', '.join([JSON_CONTENT_TYPE, ACTIVITYPUB_CONTENT_TYPE]),
 				},
 				trust_env=True,

pleroma.py

@@ -6,17 +6,7 @@ import json
 import hashlib
 import aiohttp
 from http import HTTPStatus
-
-def http_session_factory(headers={}):
-	py_version = '.'.join(map(str, sys.version_info))
-	user_agent = (
-		'pleroma-ebooks (https://lab.freak.university/KayFaraday/pleroma-ebooks); '
-		'aiohttp/{aiohttp.__version__}; '
-		'python/{py_version}'
-	)
-	return aiohttp.ClientSession(
-		headers={'User-Agent': user_agent, **headers},
-	)
+from utils import http_session_factory
 
 class BadRequest(Exception):
 	pass

utils.py

@@ -1,10 +1,23 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 import anyio
+import aiohttp
+import platform
 import contextlib
 from functools import wraps
 from datetime import datetime, timezone
 
+def http_session_factory(headers={}, **kwargs):
+	user_agent = (
+		'pleroma-ebooks (https://lab.freak.university/KayFaraday/pleroma-ebooks); '
+		f'aiohttp/{aiohttp.__version__}; '
+		f'{platform.python_implementation()}/{platform.python_version()}'
+	)
+	return aiohttp.ClientSession(
+		headers={'User-Agent': user_agent, **headers},
+		**kwargs,
+	)
+
 def as_corofunc(f):
 	@wraps(f)
 	async def wrapped(*args, **kwargs):