entrypoint

#!/usr/bin/env sh

if [ -n "$SERVICE_TYPE" ] && [ -n "$SERVICE_NAME" ]; then
  service_type=$(echo "$SERVICE_TYPE" | tr '[:lower:]' '[:upper:]')
  service_name=$(echo "$SERVICE_NAME" | tr .- _ | tr '[:lower:]' '[:upper:]')
  host_prefix="DOKKU_${service_type}_${service_name}_PORT_"
  if [ -z "$SERVICE_HOST" ] && [ -z "$SERVICE_HOST_ENV_VAR" ]; then
    SERVICE_HOST="$(echo "dokku-${service_type}-${service_name}" | tr '[:upper:]' '[:lower:]' | tr _ -)"
  fi
  if [ -z "$SERVICE_PORT" ] && [ -z "$SERVICE_PORT_ENV_VAR" ]; then
    SERVICE_PORT=$(env | sort | grep "$host_prefix" | grep PORT= | head -n1 | cut -d= -f2)
  fi
fi

proxy_to=""
if [ -n "${PROXY_TO}" ]; then
  proxy_to="$PROXY_TO"
else
  proxy_host=""
  if [ -n "$SERVICE_HOST" ]; then
    proxy_host="$SERVICE_HOST"
  elif [ -n "$SERVICE_HOST_ENV_VAR" ]; then
    proxy_host="$$SERVICE_HOST_ENV_VAR"
  fi

  proxy_port=""
  if [ -n "$SERVICE_PORT" ]; then
    proxy_port="$SERVICE_PORT"
  elif [ -n "$SERVICE_PORT_ENV_VAR" ]; then
    proxy_port="$$SERVICE_PORT_ENV_VAR"
  fi

  if [ -z "$proxy_host" ]; then
    echo "No SERVICE_HOST specified" >&2
    exit 1
  fi

  if [ -z "$proxy_port" ]; then
    echo "No SERVICE_PORT specified, using port 80"
    proxy_port="80"
  fi

  proxy_to="${proxy_host}:${proxy_port}"
fi

if [ -z "$proxy_to" ]; then
  echo "No PROXY_TO variable (or SERVICE_HOST:SERVICE_PORT combination) detected" >&2
  exit 1
fi

if [ -z "$PORT" ]; then
  echo "No PORT variable specified" >&2
  exit 1
fi

/usr/local/bin/tcp-proxy -l "0.0.0.0:$PORT" -r "$proxy_to"