Domain Processing Utility

This Go program processes domain names to extract their effective top-level domain plus one (eTLD+1) using the publicsuffix library.

Prerequisites

• Go 1.21 or later

Installation

1. Clone this repository:

   git clone https://github.com/yourusername/domain-processing-utility.git
   cd domain-processing-utility
   

2. Initialize the Go module:

   go mod init domain-processing-utility
   

3. Create a go.mod file with the following content:

   module domain-processing-utility
   
   go 1.21
   
   require github.com/globalsign/publicsuffix v0.0.0-20180223084127-7115ee24d247
   

4. Install dependencies:

   go mod tidy
   

Building the Program

To build the program, run:

go build -o apexparser

This will create an executable named apexparser in your current directory.

Usage

The program reads domain names from standard input (stdin), processes them, and prints the results to standard output (stdout).

Interactive Mode

Run the program and type domain names, one per line:

./apexparser
example.com
www.example.co.uk

Press Ctrl+D (Unix/Linux/Mac) or Ctrl+Z (Windows) to exit.

Using echo

Process a single domain:

echo "www.example.com" | ./apexparser

Process multiple domains:

echo -e "www.example.com\nexample.co.uk" | ./apexparser

Reading from a File

Process domains stored in a file:

cat domains.txt | ./apexparser

Or:

./apexparser < domains.txt

Saving Output to a File

To save the processed results to a file:

./apexparser < domains.txt > results.txt

Error Handling

• The program will print warnings for invalid inputs or processing errors to stderr.
• It will continue processing subsequent inputs even if an error occurs.
• Fatal errors will cause the program to exit with a non-zero status code.

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

This project is licensed under the MIT License - see the LICENSE file for details.