authorize_github.sh

#!/bin/bash

# use with caution all user accounts that have
# a github account and exists on the system
# will be able to logon to this system 

# make sure you have curl and jq installed

user=$1

for u in "root" "ubuntu" "ec2-user" "nobody"; do 
    if [ "$user" == "$u" ]; then
        # root not allowed, to prevent single users to login to several
        echo -e "# $user not allowed"
        exit
    fi
done

if [ $(id -u $user 2>/dev/null || echo "0") -lt 1000 ]; then
    echo -e "# user id not allowed"
    exit
fi

output=$(curl -s "https://api.github.com/users/$user/keys")
echo "$output" | jq -r '.[] | .key'