Public Suffix List
The Public Suffix List (publicsuffix.org/) is “a cross-vendor initiative to provide an accurate list of domain name suffixes”. Such a list is necessary because “there was and remains no algorithmic method of finding the highest level at which a domain may be registered for a particular top-level domain (the policies differ with each registry)…”. Public Suffix List is also a small Ruby library designed to make the Public Suffix List (publicsuffix.org/) easier to use. Public Suffix List will transparently download the latest list of top-level domains, parse the list, and optionally cache the parsed data.
The public API is as simple as I could make it. Instantiating the PublicSuffixList class downloads, parses, and caches the data. There are three instance methods:
return the top-level domain name
return the canonical domain name
split the domain name into parts
Transparent download of the TLD data file
Optional caching of optimized, parsed TLD data
require "public_suffix_list" # Downloads and parses the latest data file and returns "com". PublicSuffixList.new.tld("foobar.com") # Downloads and parses the latest data file and returns "foobar.com". PublicSuffixList.new.cdn("foobar.com") # Downloads and parses the latest data file, caches it in /tmp, # and returns ["abc", "xyz", "co.uk"]. PublicSuffixList.new(:cache_dir => "/tmp").split("abc.xyz.co.uk") # Loads the cached data in /tmp if it is less than 100 seconds old, # downloads, parses, and caches it if it is older, and returns # ["test", "parliament", "uk"]. PublicSuffixList.new(:cache_dir => "/tmp", :cache_expiry_period => 100).split("test.parliament.uk") # You don't have to instantiate PublicSuffixList every time you # use it, of course... p = PublicSuffixList.new p.split("fee.fi.fo.com") # => ["fee.fi", "fo", "com"] p.cdn("fee.fi.fo.com") # => "fo.com", "cdn" is "canonical domain name" p.tld("fee.fi.fo.com") # => "com", "tld" is "top-level domain" # You can even use other data files, both local and remote # (as long as they conform to the Public Suffix List file format). PublicSuffixList.new(:url => "spec/test.dat")
None that I am aware of.
sudo gem install public-suffix-list
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