Get a public suffix for a domain name using the Public Suffix List.
This module allows you to get the public suffix of a domain name using the Public Suffix List from http://publicsuffix.org
A public suffix is one under which Internet users can directly register names. Some examples of public suffixes are .com, .co.uk and pvt.k12.wy.us. Accurately knowing the public suffix of a domain is useful when handling web browser cookies, highlighting the most important part of a domain name in a user interface or sorting URLs by web site.
It’s up the user to provide this module with an appropriate version of the Public Suffix List. A convenience function is provided that downloads the most recent version available on http://publicsuffix.org
The fetch() function downloads the most recent version of the list and returns a file object. You should cache the data as appropriate for your application:
>>> from publicsuffix import fetch >>> psl_file = fetch()
Alternatively, if you have the list already downloaded by other means:
>>> import codecs >>> psl_file = codecs.open('publicsuffix/public_suffix_list.dat', encoding='utf8')
The PublicSuffixList class parses the Public Suffix List and allows queries for individual domain names:
>>> from publicsuffix import PublicSuffixList >>> psl = PublicSuffixList(psl_file) >>> psl.get_public_suffix("www.example.com") 'example.com'
Please note that the host part of an URL can contain strings that are not plain DNS domain names (IP addresses, Punycode-encoded names, name in combination with a port number or an username, etc.). It is up to the caller to ensure only domain names are passed to the get_public_suffix() method.
To install from the source distribution and run unit tests, use these commands:
$ python setup.py install $ python setup.py test
You can get a local copy of the development repository with:
git clone http://www.tablix.org/~avian/git/publicsuffix.git
Notes on backwards compatibility
This module ships with an out-dated copy of the Public Suffix List for compatiblity with older versions. Use of this list is deprecated since it encouraged applications that never updated the Public Suffix List data. The built-in list will be removed in a future version.
If you are using the PublicSuffixList constructor without any arguments, please use the fetch() function and implement an appropriate cache, as shown above.
Questions, bug reports, useful code bits, and suggestions should be sent to firstname.lastname@example.org
Copyright (c) 2015 Tomaž Šolc <email@example.com>
Python module included in this distribution is based on the code downloaded from http://code.google.com/p/python-public-suffix-list/, which is available under the following license:
Copyright (c) 2009 David Wilson
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
The Public Suffix List included in this distribution has been downloaded from http://publicsuffix.org/ and is covered by a separate license. Please see the license block at the top of the file itself.
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