#!/usr/bin/env bash
# Deploys the cleanup job to the shell server and installs it there.
#
#   server/scripts/deploy.sh [-i KEYFILE] [-h HOST] [--uninstall]
#
# The job runs on the box as SYSTEM, never as the root user. The Administrator account sets it up; its shell is a
# Windows one, so the commands we run there are Windows commands.
#
# The Administrator logs in with the personal key of the deployer, from the agent or from -i. The key of the website
# never gets administrator rights: it only logs in as the root user.
set -euo pipefail

HOST=nowhere.wirs.ing
USER=Administrator
KEYFILE=''
UNINSTALL=0

while [ $# -gt 0 ]; do
    case $1 in
        -i) KEYFILE=$2; shift 2 ;;
        -h) HOST=$2; shift 2 ;;
        --uninstall) UNINSTALL=1; shift ;;
        *) echo "usage: $(basename "$0") [-i KEYFILE] [-h HOST] [--uninstall]" >&2; exit 2 ;;
    esac
done

repo=$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)
server="$repo/server"
remote='C:\Users\Administrator\kik'   # where the installer is put, in the home of the Administrator
remotePath='/c/Users\Administrator\kik'   # the same place, as the file transfer sees it
temporary=()

# The host key is the one the website pins, so that the deployment cannot be intercepted.
expected=$(sed -n "s/.*const HOST_KEY = '\([^']*\)'.*/\1/p" "$repo/src/scripts/terminal.ts")
known=$(mktemp)
temporary+=("$known")
trap 'rm -f "${temporary[@]}"' EXIT
ssh-keyscan -t ed25519 "$HOST" > "$known" 2>/dev/null
actual=$(ssh-keygen -lf "$known" | awk '{print $2}')
if [ "$actual" != "$expected" ]; then
    echo "the host key of $HOST is $actual, but $expected is expected" >&2
    exit 1
fi

# The site logs in with the first key in the authorized_keys of the user on the box, so it has to be the right one.
sitekey=$(ssh-keygen -lf "$server/resources/home/.ssh/authorized_keys" | awk 'NR==1 {print $2}')
if [ "$sitekey" != 'SHA256:KUEv4d4+75h41l0OGTWCA2FbtEOQZ047ujkeh+kkFW0' ]; then
    echo "the key of the website is not the first one in server/resources/home/.ssh/authorized_keys" >&2
    exit 1
fi

options=(-o "UserKnownHostsFile=$known" -o StrictHostKeyChecking=yes)
if [ -n "$KEYFILE" ]; then options+=(-i "$KEYFILE"); fi
ssh=(ssh "${options[@]}" "$USER@$HOST")
scp=(scp "${options[@]}")

if [ "$UNINSTALL" = 1 ]; then
    "${ssh[@]}" "if exist $remote\\scripts\\install_restore_task.ps1 (powershell -NoProfile -ExecutionPolicy Bypass -File $remote\\scripts\\install_restore_task.ps1 -Uninstall) else (echo Nothing is installed.)"
    exit
fi

# The installer looks for the resources next to itself, so both directories go to the server. What was there
# before is removed, so that files that are gone from the repository do not stay on the box.
"${ssh[@]}" "if exist $remote rmdir /s /q $remote"
"${ssh[@]}" "mkdir $remote"
"${scp[@]}" -r "$server/scripts" "$server/resources" "$USER@$HOST:$remotePath/"
"${ssh[@]}" "powershell -NoProfile -ExecutionPolicy Bypass -File $remote\\scripts\\install_restore_task.ps1"