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/usr/share/logsparser/normalizers/UserAgent.xml is in python-logsparser 0.4-1.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<!--++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-->
<!--                                                            -->
<!-- pylogparser - Logs parsers python library                  -->
<!-- Copyright (C) 2011 Wallix Inc.                             -->
<!--                                                            -->
<!--++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-->
<!--                                                            -->
<!-- This package is free software; you can redistribute        -->
<!-- it and/or modify it under the terms of the GNU Lesser      -->
<!-- General Public License as published by the Free Software   -->
<!-- Foundation; either version 2.1 of the License, or (at      -->
<!-- your option) any later version.                            -->
<!--                                                            -->
<!-- This package is distributed in the hope that it will be    -->
<!-- useful, but WITHOUT ANY WARRANTY; without even the implied -->
<!-- warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR    -->
<!-- PURPOSE.  See the GNU Lesser General Public License for    -->
<!-- more details.                                              -->
<!--                                                            -->
<!-- You should have received a copy of the GNU Lesser General  -->
<!-- Public License along with this package; if not, write      -->
<!-- to the Free Software Foundation, Inc., 59 Temple Place,    -->
<!-- Suite 330, Boston, MA  02111-1307  USA                     -->
<!--                                                            -->
<!--++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-->
<!DOCTYPE normalizer SYSTEM "normalizer.dtd">
<normalizer name="UserAgent"
            version="0.99"
            unicode="yes"
            ignorecase="yes"
            matchtype="match"
            appliedTo="useragent">
    <description>
        <localized_desc language="en">This normalizer extracts additional info from the useragent field in a HTTP request.</localized_desc>
        <localized_desc language="fr">Ce normaliseur extrait des données supplémentaires des du champ useragent présent dans les requêtes HTTP.</localized_desc>
    </description>
    <authors>
        <author>mhu@wallix.com</author>
    </authors>
    <callbacks>
        <callback name="findBot">
m = extras.robot_regex.search(value)
if m:
    log["search_engine_bot"] = m.group().lower()
</callback>
        <callback name="guessOS">
known_os = {"Mac OS" : "Mac/Apple",
            "Windows" : "Windows",
            "Linux" : "Linux"}
guess = "unknown"
for i,j in known_os.items():
    if i in value:
        guess = j
        break
log['source_os'] = guess
</callback>
    </callbacks>
    <patterns>
        <pattern name="UseragentPattern">
            <text>USERAGENT</text>
            <tags>
                <tag name="__ua" tagType="Anything">
                    <substitute>USERAGENT</substitute>
                    <callbacks>
                        <callback>findBot</callback>
                        <callback>guessOS</callback>
                    </callbacks>
                </tag>
            </tags>
            <examples>
                <example>
                     <text>Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)</text>
                     <expectedTags>
                          <expectedTag name="search_engine_bot">baiduspider</expectedTag>
                          <expectedTag name="source_os">unknown</expectedTag>
                     </expectedTags>
                </example>
                <example>
                     <text>Mozilla/5.0 (iPad; U; CPU OS 3_2 like Mac OS X; en-us) AppleWebKit/531.21.10 (KHTML, like Gecko) Version/4.0.4 Mobile/7B334b Safari/531.21.10</text>
                     <expectedTags>
                          <expectedTag name="source_os">Mac/Apple</expectedTag>
                     </expectedTags>
                </example>
                <example>
                     <text>Nokia6680/1.0 (4.04.07) SymbianOS/8.0 Series60/2.6 Profile/MIDP-2.0 Configuration/CLDC-1.1</text>
                     <expectedTags>
                          <expectedTag name="source_os">unknown</expectedTag>
                     </expectedTags>
                </example>
            </examples>
        </pattern>
    </patterns>
</normalizer>