ssh_key

#!/bin/sh

# Usage: ssh_key without GH_TOKEN creates ssh key and shows public key
#        ssh_key with GH_TOKEN creates ssh key and sets directly into Github
# Refer: https://unix.stackexchange.com/a/136898

# Main entry point
main() {
  if [[ -e ~/.ssh ]] && [[ -d ~/.ssh ]]; then
    echo ''
  else
    rm -rf ~/.ssh
    ssh-keygen -t rsa -b 4096 -P '' -f ~/.ssh/id_rsa
    ssh-keyscan -t rsa github.com >> ~/.ssh/known_hosts
  fi

  if ! ssh -T git@github.com; then
    echo 'Add the public key to your git'
    [[ -z $GH_TOKEN ]] && cat ~/.ssh/id_rsa.pub || add_ssh_gh
    exit 1
  fi
}

# function to configure SSH key in GitHub thru API
add_ssh_gh() {
  set +e
  curl --fail -H "Authorization: token $GH_TOKEN" https://api.github.com/user >/dev/null 2>&1
  [[ $? -gt 0 ]] && echo 'Invalid TOKEN!' && exit 1
  set -e
  echo 'GitHub API works!'
  title="$(cat /etc/hostname)_ssh"
  ssh_pub_key=$(cat ~/.ssh/id_rsa.pub)
  set +e
  curl -H "Authorization: token $GH_TOKEN" --data "{\"title\":\"$title\",\"key\":\"$ssh_pub_key\"}" https://api.github.com/user/keys
  [[ $? -gt 0 ]] && echo 'Provide Public Key write key access' && exit 1
  set -e
  echo 'Successfully added the key to GitHub'
}


main