web.py 文件源码

python
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项目:noc-orchestrator 作者: DirceuSilvaLabs 项目源码 文件源码
def _get_version(value):
    # Figures out what version value is.  Version 1 did not include an
    # explicit version field and started with arbitrary base64 data,
    # which makes this tricky.
    m = _signed_value_version_re.match(value)
    if m is None:
        version = 1
    else:
        try:
            version = int(m.group(1))
            if version > 999:
                # Certain payloads from the version-less v1 format may
                # be parsed as valid integers.  Due to base64 padding
                # restrictions, this can only happen for numbers whose
                # length is a multiple of 4, so we can treat all
                # numbers up to 999 as versions, and for the rest we
                # fall back to v1 format.
                version = 1
        except ValueError:
            version = 1
    return version
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