Add galaxy to user agent

lib/galaxy/app.py

@@ -133,6 +133,7 @@
     build_tours_registry,
     ToursRegistry,
 )
+from galaxy.util import user_agent  # noqa: F401
 from galaxy.util import (
     ExecutionTimer,
     heartbeat,

lib/galaxy/tools/data_fetch.py

@@ -26,6 +26,7 @@
     stream_to_file,
     stream_url_to_file,
 )
+from galaxy.util import user_agent  # noqa: F401
 from galaxy.util import (
     in_directory,
     safe_makedirs,

lib/galaxy/util/user_agent.py

@@ -0,0 +1,34 @@
+import urllib
+
+import requests
+
+from galaxy.version import VERSION
+
+
+def __append_word_to_user_agent(word):
+
+    # set requests User-Agent
+    old_default_user_agent = requests.utils.default_user_agent
+
+    def new_default_user_agent(*args):
+        return f"{old_default_user_agent(*args)} {word}"
+
+    requests.utils.default_user_agent = new_default_user_agent
+
+    # set urllib User-Agent
+    old_build_opener = urllib.request.build_opener
+
+    def modify_user_agent_header(header):
+        if header[0].lower() == "user-agent":
+            return (header[0], f"{header[1]} {word}")
+        return header
+
+    def new_build_opener(*handlers):
+        opener = old_build_opener(*handlers)
+        opener.addheaders = [modify_user_agent_header(header) for header in opener.addheaders]
+        return opener
+
+    urllib.request.build_opener = new_build_opener
+
+
+__append_word_to_user_agent(f"galaxy/{VERSION}")