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37 lines
1.4 KiB
Python
37 lines
1.4 KiB
Python
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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"""
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Extract the Docker version from the user agent, taking special care to handle the case of a 1.5
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client requesting an auth token, which sends a broken user agent.
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If we can not positively identify a version, return 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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