Domainatrex

Domainatrex is a TLD parsing library for Elixir, using the Public Suffix list

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Installation

Add the following to your mix.exs

defp deps do
  [
    {:domainatrex, "~> 3.2"},
  ]

Usage

Domainatrex parses host names using the Public Suffix List and is heavily inspired by the fantastic Domainatrix library for Ruby

iex> Domainatrex.parse("someone.com")
{:ok, %{domain: "someone", subdomain: "", tld: "com"}}

iex> Domainatrex.parse("blog.someone.id.au")
{:ok, %{domain: "someone", subdomain: "blog", tld: "id.au"}}

iex> Domainatrex.tld?("com")
true

iex> Domainatrex.tld?("someone.com")
false

Configuration

For maximum performance, Domainatrex reads the list of all known top-level domains at compile time. By default, the package will attempt to fetch the latest list of TLDs from the web. If fetching fails (or is disabled), it falls back to a local copy. If the fallback file is also missing, compilation will exit with an error.

You can configure this behavior in your config.exs as follows:

:fetch_latest: Whether to fetch the latest public suffix list at compile time; default is true
:public_suffix_list_url: A charlist URL to fetch the public suffix file from; default is ~c"https://publicsuffix.org/list/public_suffix_list.dat"
:fallback_local_copy: Path to a local suffix file used when fetching fails or is disabled; default is "priv/public_suffix_list.dat" included in the package
:custom_suffixes: Additional suffixes to add beyond the public suffix file; default is []
:icann_only: When true, only include ICANN domains (excludes private domains like s3.amazonaws.com); default is false
:include_private: When false, excludes private domains (same effect as icann_only: true); default is true

Here's a complete example of how you might customize this behavior in your config.exs:

config :domainatrex,
  # Explicitly allow compile-time HTTP request to fetch the latest list of TLDs (default)
  fetch_latest: true,
  # Download the public suffix list from the official source
  public_suffix_list_url: ~c"https://publicsuffix.org/list/public_suffix_list.dat",
  fallback_local_copy: "priv/my_app_custom_suffix_list.dat",
  # Add custom suffix for com.be
  custom_suffixes: ["com.be"],
  # Include private domains (default)
  include_private: true

Limitations

Expects host names only: Pass a host name like example.co.uk, not a full URL. Use URI.parse/1 to extract the host from a URL first.
IP addresses: IPv4 addresses like 192.168.1.1 are not recognized as valid domains and will return an error.
Punycode: Internationalized domain names (IDN) must be in Unicode form, not punycode. For example, 例子.中国 works, but xn--fsq.xn--fiqs8s does not.
Trailing/multiple dots: Inputs with trailing dots (example.com.), leading dots (.example.com), or consecutive dots (example..com) are rejected as invalid.

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