#!/bin/bash

set -e

cat << "EOF"
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    ______     ______     ______     __   __   __     ______   __                        
   /\  ___\   /\  == \   /\  __ \   /\ \ / /  /\ \   /\__  _\ /\ \                       
   \ \ \__ \  \ \  __<   \ \  __ \  \ \ \'/   \ \ \  \/_/\ \/ \ \ \____                  
    \ \_____\  \ \_\ \_\  \ \_\ \_\  \ \__|    \ \_\    \ \_\  \ \_____\                 
     \/_____/   \/_/ /_/   \/_/\/_/   \/_/      \/_/     \/_/   \/_____/                 
                                                                                         
 __   __     ______     ______   __    __     ______     __  __     ______     ______    
/\ "-.\ \   /\  ___\   /\__  _\ /\ "-./  \   /\  __ \   /\ \/ /    /\  ___\   /\  == \   
\ \ \-.  \  \ \  __\   \/_/\ \/ \ \ \-./\ \  \ \  __ \  \ \  _"-.  \ \  __\   \ \  __<   
 \ \_\\"\_\  \ \_____\    \ \_\  \ \_\ \ \_\  \ \_\ \_\  \ \_\ \_\  \ \_____\  \ \_\ \_\ 
  \/_/ \/_/   \/_____/     \/_/   \/_/  \/_/   \/_/\/_/   \/_/\/_/   \/_____/   \/_/ /_/ 
                                                                                                                                                                                                 
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
EOF

NETMAKER_BASE_DOMAIN=nm.$(curl -s ifconfig.me | tr . -).nip.io
COREDNS_IP=$(ip route get 1 | sed -n 's/^.*src \([0-9.]*\) .*$/\1/p')
SERVER_PUBLIC_IP=$(curl -s ifconfig.me)
MASTER_KEY=$(tr -dc A-Za-z0-9 </dev/urandom | head -c 30 ; echo '')
EMAIL="fake@email.com"

echo "Default Base Domain: $NETMAKER_BASE_DOMAIN"
echo "To Override, add a Wildcard (*.netmaker.example.com) DNS record pointing to $SERVER_PUBLIC_IP"
echo "Or, add three DNS records pointing to $SERVER_PUBLIC_IP for the following (Replacing 'netmaker.example.com' with the domain of your choice):"
echo "   dashboard.netmaker.example.com"
echo "         api.netmaker.example.com"
echo "-----------------------------------------------------"
read -p "Domain (Hit 'enter' to use $NETMAKER_BASE_DOMAIN): " domain
read -p "Contact Email: " email

if [ -n "$domain" ]; then
  NETMAKER_BASE_DOMAIN=$domain
fi
if [ -n "$email" ]; then
  EMAIL=$email
fi

while true; do
    read -p "Configure a default network automatically (y/n)? " yn
    case $yn in
        [Yy]* ) MESH_SETUP="true"; break;;
        [Nn]* ) MESH_SETUP="false"; break;;
        * ) echo "Please answer yes or no.";;
    esac
done

while true; do
    read -p "Configure a VPN gateway automatically (y/n)? " yn
    case $yn in
        [Yy]* ) VPN_SETUP="true"; break;;
        [Nn]* ) VPN_SETUP="false"; break;;
        * ) echo "Please answer yes or no.";;
    esac
done

if [ "${VPN_SETUP}" == "true" ]; then
while :; do
    read -ep '# of VPN clients to configure by default: ' num_clients
    [[ $num_clients =~ ^[[:digit:]]+$ ]] || continue
    (( ( (num_clients=(10#$num_clients)) <= 200 ) && num_clients >= 0 )) || continue
    break
done
fi

if [ -n "$num_clients" ]; then
  NUM_CLIENTS=$num_clients
fi

while true; do
    read -p "Override master key ($MASTER_KEY) (y/n)? " yn
    case $yn in
        [Yy]* ) override="true"; break;;
        [Nn]* ) override="false"; break;;
        * ) echo "Please answer yes or no.";;
    esac
done

if [ "${override}" == "true" ]; then
while :; do
    read -ep 'New Master Key: ' key
    result="$(cracklib-check <<<"$key")"
    okay="$(awk -F': ' '{ print $2}' <<<"$result")"
    if [[ "$okay" == "OK" ]]
    then
	MASTER_KEY=$key
	break
    else
	echo "Your password was rejected - $result"
        echo "Try again."
    fi
done
fi

echo "-----------------------------------------------------------------"
echo "                SETUP ARGUMENTS"
echo "-----------------------------------------------------------------"
echo "        domain: $NETMAKER_BASE_DOMAIN"
echo "         email: $EMAIL"
echo "    coredns ip: $COREDNS_IP"
echo "     public ip: $SERVER_PUBLIC_IP"
echo "    master key: $MASTER_KEY"
echo "   setup mesh?: $MESH_SETUP"
echo "    setup vpn?: $VPN_SETUP"
if [ "${VPN_SETUP}" == "true" ]; then
echo "     # clients: $NUM_CLIENTS"
fi

while true; do
    read -p "Does everything look right (y/n)? " yn
    case $yn in
        [Yy]* ) override="true"; break;;
        [Nn]* ) echo "exiting..."; exit;;
        * ) echo "Please answer yes or no.";;
    esac
done


echo "Beginning installation in 5 seconds..."

sleep 5


echo "Setting Caddyfile..."

sed -i "s/NETMAKER_BASE_DOMAIN/$NETMAKER_BASE_DOMAIN/g" /root/Caddyfile
sed -i "s/YOUR_EMAIL/$EMAIL/g" /root/Caddyfile

echo "Setting docker-compose..."

sed -i "s/NETMAKER_BASE_DOMAIN/$NETMAKER_BASE_DOMAIN/g" /root/docker-compose.yml
sed -i "s/SERVER_PUBLIC_IP/$SERVER_PUBLIC_IP/g" /root/docker-compose.yml
sed -i "s/COREDNS_IP/$COREDNS_IP/g" /root/docker-compose.yml
sed -i "s/REPLACE_MASTER_KEY/$MASTER_KEY/g" /root/docker-compose.yml

echo "Starting containers..."

docker-compose -f /root/docker-compose.yml up -d

sleep 2

setup_mesh() {
echo "Creating default network (10.101.0.0/16)..."

curl -s -o /dev/null -d '{"addressrange":"10.101.0.0/16","netid":"default"}' -H "Authorization: Bearer $MASTER_KEY" -H 'Content-Type: application/json' localhost:8081/api/networks

sleep 2

echo "Creating default key..."

curlresponse=$(curl -s -d '{"uses":99999,"name":"defaultkey"}' -H "Authorization: Bearer $MASTER_KEY" -H 'Content-Type: application/json' localhost:8081/api/networks/default/keys)
ACCESS_TOKEN=$(jq -r '.accessstring' <<< ${curlresponse})

sleep 2

echo "Configuring Netmaker server as ingress gateway..."

curlresponse=$(curl -s -H "Authorization: Bearer $MASTER_KEY" -H 'Content-Type: application/json' localhost:8081/api/nodes/default)
SERVER_ID=$(jq -r '.[0].macaddress' <<< ${curlresponse})

curl -o /dev/null -s -X POST -H "Authorization: Bearer $MASTER_KEY" -H 'Content-Type: application/json' localhost:8081/api/nodes/default/$SERVER_ID/createingress

VPN_ACCESS_TOKEN=$ACCESS_TOKEN

}

mesh_connect_logs() {
sleep 5
echo "-----------------------------------------------------------------"
echo "-----------------------------------------------------------------"
echo "DEFAULT NETWORK CLIENT INSTALL INSTRUCTIONS:"
echo "-----------------------------------------------------------------"
echo "-----------------------------------------------------------------"
sleep 5
echo "For Linux and Mac clients, install with the following command:"
echo "- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -"
echo "curl -sfL https://raw.githubusercontent.com/gravitl/netmaker/develop/scripts/netclient-install.sh | sudo KEY=$VPN_ACCESS_TOKEN sh -"
sleep 5
echo "-----------------------------------------------------------------"
echo "-----------------------------------------------------------------"
echo "For Windows clients, perform the following from powershell, as administrator:"
echo "- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -"
echo "1. Make sure WireGuardNT is installed - https://download.wireguard.com/windows-client/wireguard-installer.exe"
echo "2. Download netclient.exe - wget https://github.com/gravitl/netmaker/releases/download/latest/netclient.exe"
echo "3. Install Netclient - powershell.exe .\\netclient.exe join -t $VPN_ACCESS_TOKEN"
echo "4. Whitelist C:\ProgramData\Netclient in Windows Defender"
sleep 5
echo "-----------------------------------------------------------------"
echo "-----------------------------------------------------------------"
echo "For Android and iOS clients, perform the following steps:"
echo "- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -"
echo "1. Log into UI at dashboard.$NETMAKER_BASE_DOMAIN"
echo "2. Navigate to \"EXTERNAL CLIENTS\" tab"
echo "3. Select the gateway and create clients"
echo "4. Scan the QR Code from WireGuard app in iOS or Android"
echo "-----------------------------------------------------------------"
echo "-----------------------------------------------------------------"
sleep 5
}

setup_vpn() {
echo "Creating vpn network (10.201.0.0/16)..."

curl -s -o /dev/null -d '{"addressrange":"10.201.0.0/16","netid":"vpn","defaultextclientdns":"8.8.8.8"}' -H "Authorization: Bearer $MASTER_KEY" -H 'Content-Type: application/json' localhost:8081/api/networks

sleep 2

echo "Configuring Netmaker server as vpn inlet..."

curlresponse=$(curl -s -H "Authorization: Bearer $MASTER_KEY" -H 'Content-Type: application/json' localhost:8081/api/nodes/vpn)
SERVER_ID=$(jq -r '.[0].macaddress' <<< ${curlresponse})

curl -s -o /dev/null -X POST -H "Authorization: Bearer $MASTER_KEY" -H 'Content-Type: application/json' localhost:8081/api/nodes/vpn/$SERVER_ID/createingress

echo "Waiting 10 seconds for server to apply configuration..."

sleep 10

echo "Configuring Netmaker server VPN gateway..."

[ -z "$GATEWAY_IFACE" ] && GATEWAY_IFACE=$(ip -4 route ls | grep default | grep -Po '(?<=dev )(\S+)' | grep -v default)

curlresponse=$(curl -s -H "Authorization: Bearer $MASTER_KEY" -H 'Content-Type: application/json' localhost:8081/api/nodes/vpn)
SERVER_ID=$(jq -r '.[0].macaddress' <<< ${curlresponse})

EGRESS_JSON=$( jq -n \
                  --arg gw "$GATEWAY_IFACE" \
                  '{ranges: ["0.0.0.0/0"], interface: $gw}' )

curl -s -o /dev/null -X POST -d "$EGRESS_JSON" -H "Authorization: Bearer $MASTER_KEY" -H 'Content-Type: application/json' localhost:8081/api/nodes/vpn/$SERVER_ID/creategateway

echo "Creating client configs..."

for ((a=1; a <= $NUM_CLIENTS; a++))
do
        CLIENT_JSON=$( jq -n \
                  --arg clientid "vpnclient-$a" \
                  '{clientid: $clientid}' )

        curl -s -o /dev/null -d "$CLIENT_JSON" -H "Authorization: Bearer $MASTER_KEY" -H 'Content-Type: application/json' localhost:8081/api/extclients/vpn/$SERVER_ID
done

}

vpn_connect_logs() {
sleep 5
echo "-----------------------------------------------------------------"
echo "-----------------------------------------------------------------"
echo "VPN GATEWAY CLIENT INSTALL INSTRUCTIONS:"
echo "- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -"
echo "1. log into dashboard.$NETMAKER_BASE_DOMAIN"
echo "2. Navigate to \"EXTERNAL CLIENTS\" tab"
echo "3. Download or scan a client config (vpnclient-x) to the appropriate device"
echo "4. Follow the steps for your system to configure WireGuard on the appropriate device"
echo "5. Create and delete clients as necessary. Changes to netmaker server settings require regenerating ext clients."
echo "-----------------------------------------------------------------"
echo "-----------------------------------------------------------------"
sleep 5
}

if [ "${MESH_SETUP}" != "false" ]; then
        setup_mesh
fi

if [ "${VPN_SETUP}" == "true" ]; then
        setup_vpn
fi

if [ "${MESH_SETUP}" != "false" ]; then
        mesh_connect_logs
fi

if [ "${VPN_SETUP}" == "true" ]; then
        vpn_connect_logs
fi

echo "Netmaker setup is now complete. You are ready to begin using Netmaker."
echo "Visit dashboard.$NETMAKER_BASE_DOMAIN to log in"

cp -f /etc/skel/.bashrc /root/.bashrc