build

#!/usr/bin/env bash

set -eu

layers_dir="$1"
env_dir="$2/env"
plan_path="$3"

if compgen -G "${env_dir}/*" > /dev/null; then
  for var in ${env_dir}/*; do
    declare "$(basename ${var})=$(<${var})"
  done
fi

echo "[wetty]"
wetty_layer=$layers_dir/wetty
wetty_version="2.0.2"

if [ -f ${wetty_layer}.toml ] && [ "$(cat "${wetty_layer}.toml" | yj -t | jq .metadata.version -r)" == "${wetty_version}" ]; then
  echo "Using cached version: ${wetty_version}"
  touch ${wetty_layer}.toml
else
  echo "Installing version: ${wetty_version}"
  mkdir -p $wetty_layer/env
  npm install --prefix $wetty_layer wetty@${wetty_version}

  echo -n "$wetty_layer/node_modules" > $wetty_layer/env/NODE_PATH

  echo "Generate OpenSSL certificates"
  mkdir -p $wetty_layer/.ssl
  openssl req -x509 -nodes -days 1095 -newkey ec:<(openssl ecparam -name secp384r1) -subj "/C=GB/ST=None/L=None/O=None/OU=None/CN=None" -out $wetty_layer/.ssl/wetty.crt -keyout $wetty_layer/.ssl/wetty.key
  chmod 700 $wetty_layer/.ssl
  chmod 644 $wetty_layer/.ssl/wetty.crt
  chmod 600 $wetty_layer/.ssl/wetty.key

  echo "Generate the ssh key file"
  mkdir -p $wetty_layer/.ssh
  ssh-keygen -q -C "wetty-keyfile" -t ed25519 -N '' -f $wetty_layer/.ssh/wetty 2>/dev/null <<< y >/dev/null
  cat $wetty_layer/.ssh/wetty.pub >> $wetty_layer/.ssh/authorized_keys
  chmod 700 $wetty_layer/.ssh
  chmod 644 $wetty_layer/.ssh/authorized_keys
  chmod 600 $wetty_layer/.ssh/wetty
fi

force_command="${WEB_TTY_CMD:-"bash"}"

cat << EOF > $wetty_layer/.ssh/sshd_config
HostKey $wetty_layer/.ssh/wetty
AuthorizedKeysFile $wetty_layer/.ssh/authorized_keys
ForceCommand bash -c "HOME=/workspace /cnb/lifecycle/launcher $force_command"
EOF

npm install "$wetty_layer/node_modules/wetty"

cat <<BASH > wetty.sh
#!/bin/bash

/usr/sbin/sshd -f $wetty_layer/.ssh/sshd_config -o "Port 2222"

port=\${WEB_TTY_PORT:-\$PORT}

npx wetty --host 0.0.0.0 -port \${port:-3000} --title wetty -base / \
  --ssh-key $wetty_layer/.ssh/wetty \
  --ssh-host localhost \
  --ssh-user \$(whoami) \
  --ssh-port 2222 \
  --ssh-auth publickey
BASH
chmod +x wetty.sh

cat <<TOML > ${wetty_layer}.toml
launch = true
cache = true
[metadata]
version = "${wetty_version}"
TOML

cat <<TOML > ${layers_dir}/launch.toml
[[processes]]
type = "web"
command = "./wetty.sh"

[[processes]]
type = "bash"
command = "/bin/bash"
TOML