dokku/plugins/proxy/functions

#!/usr/bin/env bash
set -eo pipefail
[[ $DOKKU_TRACE ]] && set -x
source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"

fn-proxy-escape-extended-sed() {
  # Escaped delimiter is '/'
  local input="$1"
  echo "$input" | sed -E 's#[][()\.^$?*+{}|/]#\\&#g'
}

fn-proxy-report-label-overwrite() {
  declare desc="overwrite proxy labels file with new labels"
  declare LABELS="$1" PROXY_LABELS_FILE_PATH="$2"

  if [[ -f "$PROXY_LABELS_FILE_PATH" ]]; then
    local DONE=false
    until $DONE; do
      local line
      read -r line || local DONE=true

      [[ -z "$line" ]] && continue

      case "$line" in
        \#*)
          continue
          ;;

        --label*)
          local label_name="$(echo "$line" | sed -E "s/^--label ['\"]([^=]+)=.*/\1/")"
          local escaped_label_name="$(fn-proxy-escape-extended-sed "$label_name")"
          local match="$(echo "$LABELS" | sed -E "s/.*--label ['\"]($escaped_label_name)=.*/\1/")"
          if [[ -n "$match" ]]; then
            dokku_log_warn "Dokku label \"$match\" will be overwritten by user-set proxy label."
          fi
          continue
          ;;

        *)
          dokku_log_warn "Invalid line '$line' in proxy label file $PROXY_FILE_PATH"
          ;;
      esac
    done <"$PROXY_LABELS_FILE_PATH"
  fi
}

fn-proxy-get-labels-file-path() {
  declare desc="return proxy labels config file path for specified proxy"
  declare PROXY="$1" APP="$2"
  local PROXY_FILE="${DOKKU_LIB_ROOT}/config/${PROXY}/${APP}/labels"

  echo "$PROXY_FILE"
}

fn-proxy-display-labels() {
  declare desc="print user-set app container labels for specified proxy"
  declare PROXY="$1" APP="$2"
  local proxy_labels_file_path="$(fn-proxy-get-labels-file-path "$PROXY" "$APP")"
  dokku_log_info2_quiet "${APP} ${PROXY} labels"
  sed -e 's/^/    /' "$proxy_labels_file_path"
}

fn-proxy-show-label() {
  declare desc="print single user-set app container label for specified proxy"
  declare PROXY="$1" APP="$2" PASSED_LABEL_NAME="$3"

  local proxy_labels_file_path="$(fn-proxy-get-labels-file-path "$PROXY" "$APP")"
  if [[ ! -s "$proxy_labels_file_path" ]]; then
    return
  fi

  local all_proxy_labels="$(<"$proxy_labels_file_path")"
  local escaped_label_name="$(fn-proxy-escape-extended-sed "$PASSED_LABEL_NAME")"
  local proxy_label_value="$(echo -e "${all_proxy_labels}" | sed -E -n "s/^--label ['\"]${escaped_label_name}=(.*)['\"] \$/\1/p")"

  echo "$proxy_label_value"
}