#!/usr/bin/env bash
set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x

restart_nginx () {
  case "$DOKKU_DISTRO" in
    ubuntu)
      sudo /etc/init.d/nginx reload > /dev/null
      ;;

    opensuse)
      sudo /sbin/service nginx reload > /dev/null
      ;;
  esac
}

case "$1" in
  nginx:build-config)
    APP="$2"; PORT="$3"
    [[ -z "$PORT" ]] && PORT=$(< "$DOKKU_ROOT/$APP/PORT")
    VHOST_PATH="$DOKKU_ROOT/$APP/VHOST"
    WILDCARD_SSL="$DOKKU_ROOT/tls"
    SSL="$DOKKU_ROOT/$APP/tls"

    [[ -f "$DOKKU_ROOT/$APP/ENV" ]] && source $DOKKU_ROOT/$APP/ENV

    if [[ ! -n "$NO_VHOST" ]]; then
      NONSSL_VHOSTS=$(cat $VHOST_PATH)
      if [[ -e "$SSL/server.crt" ]] && [[ -e "$SSL/server.key" ]]; then
        SSL_INUSE="$SSL"
        SSL_DIRECTIVES=$(cat <<EOF
  ssl_certificate     $SSL_INUSE/server.crt;
  ssl_certificate_key $SSL_INUSE/server.key;
EOF
)
      elif  [[ -e "$WILDCARD_SSL/server.crt" ]] && [[ -e "$WILDCARD_SSL/server.key" ]]; then
        SSL_INUSE="$WILDCARD_SSL"
        SSL_DIRECTIVES=""
      fi

      NGINX_CONF="$PLUGIN_PATH/nginx-vhosts/templates/nginx.conf"
      SCHEME="http"
      if [[ -n "$SSL_INUSE" ]]; then
        NGINX_CONF="$PLUGIN_PATH/nginx-vhosts/templates/nginx.ssl.conf"
        SCHEME="https"

        SSL_HOSTNAME=$(openssl x509 -in $SSL_INUSE/server.crt -noout -subject | tr '/' '\n' | grep CN= | cut -c4-)
        SSL_HOSTNAME=$(echo "$SSL_HOSTNAME" | sed 's|\.|\\.|g' | sed 's/\*/\.\*/g')
        SSL_VHOSTS=$(egrep ^"$SSL_HOSTNAME"$ $VHOST_PATH)
        NONSSL_VHOSTS=$(egrep -v ^"$SSL_HOSTNAME"$ $VHOST_PATH || exit 0)

        while read line; do
          echo "-----> Configuring SSL for $line..."
          SSL_SERVER_NAME=$line
          eval "cat <<< \"$(< $NGINX_CONF)\" >> $DOKKU_ROOT/$APP/nginx.conf"
        done <<< "$SSL_VHOSTS"
      fi

      APP_NGINX_TEMPLATE="$DOKKU_ROOT/$APP/nginx.conf.template"
      if [[ -f $APP_NGINX_TEMPLATE ]]; then
        echo "-----> Overriding default nginx.conf with detected nginx.conf.template"
        NGINX_CONF=$APP_NGINX_TEMPLATE
      fi

      xargs -i echo "-----> Configuring {}..." < $VHOST_PATH
      # Include SSL_VHOSTS so we can redirect http to https on that hostname as well
      NOSSL_SERVER_NAME=$(echo $NONSSL_VHOSTS $SSL_VHOSTS| tr '\n' ' ')

      echo "-----> Creating $SCHEME nginx.conf"
      echo "upstream $APP { server 127.0.0.1:$PORT; }" > $DOKKU_ROOT/$APP/nginx.conf
      eval "cat <<< \"$(< $NGINX_CONF)\" >> $DOKKU_ROOT/$APP/nginx.conf"

      echo "-----> Running nginx-pre-reload"
      pluginhook nginx-pre-reload $APP $PORT

      echo "       Reloading nginx"
      restart_nginx
    else
      if [[ -f "$DOKKU_ROOT/$APP/VHOST" ]]; then
        echo "-----> NO_VHOST set, deleting $APP/VHOST"
        rm "$DOKKU_ROOT/$APP/VHOST"
      fi
      if [[ -f "$DOKKU_ROOT/$APP/nginx.conf" ]]; then
        echo "-----> NO_VHOST set, deleting nginx.conf"
        rm "$DOKKU_ROOT/$APP/nginx.conf"

        echo "-----> NO_VHOST set, reloading nginx after nginx.conf deletion"
        restart_nginx
      fi
    fi
    ;;

  nginx:import-ssl)
    [[ -z $2 ]] && echo "Please specify an app to run the command on" && exit 1
    [[ ! -d "$DOKKU_ROOT/$2" ]] && echo "App $2 does not exist" && exit 1
    [[ -t 0 ]] && echo "Tar archive containing server.crt and server.key expected on stdin" && exit 1
    APP="$2"

    TEMP_DIR=$(mktemp -d)
    cd $TEMP_DIR
    tar xvf - <&0
    [[ ! -f "$TEMP_DIR/server.crt" ]] && echo "Tar archive missing server.crt" && exit 1
    [[ ! -f "$TEMP_DIR/server.key" ]] && echo "Tar archive missing server.key" && exit 1

    mkdir -p "$DOKKU_ROOT/$APP/tls"
    mv "$TEMP_DIR/server.crt" "$DOKKU_ROOT/$APP/tls/server.crt"
    mv "$TEMP_DIR/server.key" "$DOKKU_ROOT/$APP/tls/server.key"
    cd $DOKKU_ROOT
    rm -rf $TEMP_DIR
    dokku nginx:build-config $APP
    ;;

  help | nginx:help)
    cat && cat<<EOF
    nginx:import-ssl <app>                          Imports a tarball from stdin; should contain server.crt and server.key
    nginx:build-config <app>                        (Re)builds nginx config for given app
EOF
    ;;

  *)
    exit $DOKKU_NOT_IMPLEMENTED_EXIT
    ;;

esac