This bash script helps automate the setup of GitHub authentication using either a Personal Access Token (PAT) or SSH keys. Follow the script prompts to configure your GitHub credentials securely and efficiently.

setup_github_auth.sh

#!/bin/bash

# Function to configure Git to use a Personal Access Token (PAT)
setup_pat() {
    echo "Configuring Git to use a Personal Access Token (PAT)..."
    read -p 'Enter your GitHub username: ' github_username
    echo "Please generate a PAT from https://github.com/settings/tokens and copy it."
    read -sp 'Enter your GitHub Personal Access Token: ' github_pat
    echo

    # Store the PAT using Git credential helper
    git config --global credential.helper store
    echo "https://${github_username}:${github_pat}@github.com" > ~/.git-credentials
    echo "PAT configuration complete."
}

# Function to configure SSH keys for GitHub
setup_ssh() {
    echo "Setting up SSH keys for GitHub..."
    read -p 'Enter your GitHub username: ' github_username

    # Generate SSH key if it doesn't exist
    if [ ! -f ~/.ssh/id_ed25519 ]; then
        echo "Generating a new SSH key..."
        ssh-keygen -t ed25519 -C "$(git config user.email)"
    else
        echo "SSH key already exists."
    fi

    # Start the SSH agent and add the SSH key
    echo "Starting the SSH agent..."
    eval "$(ssh-agent -s)"
    ssh-add ~/.ssh/id_ed25519

    # Display the SSH public key
    echo "Copy the following SSH key and add it to your GitHub account at https://github.com/settings/keys"
    echo "Public SSH Key:"
    cat ~/.ssh/id_ed25519.pub
    echo "SSH key configuration complete."
}

# Function to prompt user for setup choice
prompt_user() {
    echo "Choose the authentication method you want to set up:"
    echo "1. Personal Access Token (PAT)"
    echo "2. SSH Key"
    read -p 'Enter your choice (1 or 2): ' choice

    case $choice in
        1)
            setup_pat
            ;;
        2)
            setup_ssh
            ;;
        *)
            echo "Invalid choice. Please run the script again and select 1 or 2."
            ;;
    esac
}

# Main script execution
prompt_user