35 lines
1.3 KiB
Python
35 lines
1.3 KiB
Python
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import re
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from semantic_version import Version
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_USER_AGENT_SEARCH_REGEX = re.compile(r'docker\/([0-9]+(?:\.[0-9]+){1,2})')
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_EXACT_1_5_USER_AGENT = re.compile(r'^Go 1\.1 package http$')
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_ONE_FIVE_ZERO = '1.5.0'
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def docker_version(user_agent_string):
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""" Extract the Docker version from the user agent, taking special care to
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handle the case of a 1.5 client requesting an auth token, which sends
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a broken user agent. If we can not positively identify a version, return
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None.
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"""
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# First search for a well defined semver portion in the UA header.
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found_semver = _USER_AGENT_SEARCH_REGEX.search(user_agent_string)
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if found_semver:
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# Docker changed their versioning scheme on Feb 17, 2017 to use date-based versioning:
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# https://github.com/docker/docker/pull/31075
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# This scheme allows for 0s to appear as prefixes in the major or minor portions of the version,
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# which violates semver. Strip them out.
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portions = found_semver.group(1).split('.')
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updated_portions = [(p[:-1].lstrip('0') + p[-1]) for p in portions]
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return Version('.'.join(updated_portions), partial=True)
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# Check if we received the very specific header which represents a 1.5 request
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# to the auth endpoints.
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elif _EXACT_1_5_USER_AGENT.match(user_agent_string):
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return Version(_ONE_FIVE_ZERO)
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else:
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return None
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