dokku/plugins/traefik-vhosts/docker-args-process-deploy

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

trigger-traefik-vhosts-docker-args-process-deploy() {
  declare desc="nginx-vhosts core-post-deploy plugin trigger"
  declare trigger="docker-args-process-deploy"
  declare APP="$1" IMAGE_SOURCE_TYPE="$2" IMAGE_TAG="$3" PROC_TYPE="$4" CONTAINER_INDEX="$5"
  local app_domains is_app_listening output proxy_container_port proxy_host_port port_map proxy_port_map proxy_scheme proxy_schemes traefik_domains
  local proxy_container_http_port proxy_container_http_port_candidate proxy_host_http_port_candidate
  local proxy_container_https_port proxy_container_https_port_candidate proxy_host_https_port_candidate
  local app_urls_path="$DOKKU_ROOT/$APP/URLS"
  local STDIN=$(cat)

  if [[ "$PROC_TYPE" != "web" ]]; then
    return
  fi

  if [[ "$(plugn trigger proxy-type "$APP")" != "traefik" ]]; then
    return
  fi

  if [[ "$(plugn trigger proxy-is-enabled "$APP")" != "true" ]]; then
    return
  fi

  if ! plugn trigger domains-vhost-enabled "$APP" 2>/dev/null; then
    return
  fi

  # run this silently or the output will be set as a label
  plugn trigger domains-setup "$APP" >/dev/null

  # ensure we have a port mapping
  plugn trigger proxy-configure-ports "$APP"

  # gather port mapping information
  # we only support proxying a single port for http and https listeners
  # so this block parses the port mappings and tries to find the correct
  # mapping to expose
  is_app_listening="false"
  proxy_port_map="$(plugn trigger config-get "$APP" DOKKU_PROXY_PORT_MAP)"
  for port_map in $proxy_port_map; do
    proxy_scheme="$(awk -F ':' '{ print $1 }' <<<"$port_map")"
    proxy_host_port="$(awk -F ':' '{ print $2 }' <<<"$port_map")"
    proxy_container_port="$(awk -F ':' '{ print $3 }' <<<"$port_map")"

    if [[ "$proxy_scheme" == "http" ]]; then
      is_app_listening="true"
      if [[ -z "$proxy_container_http_port_candidate" ]]; then
        proxy_container_http_port_candidate="$proxy_container_port"
        proxy_host_http_port_candidate="$proxy_host_port"
      fi

      if [[ "$proxy_host_port" == "80" ]] && [[ -z "$proxy_container_http_port" ]]; then
        proxy_container_http_port="$proxy_container_port"
      fi
    fi

    if [[ "$proxy_scheme" == "https" ]]; then
      is_app_listening="true"
      if [[ -z "$proxy_container_https_port_candidate" ]]; then
        proxy_container_https_port_candidate="$proxy_container_port"
        proxy_host_https_port_candidate="$proxy_host_port"
      fi

      if [[ "$proxy_host_port" == "443" ]] && [[ -z "$proxy_container_https_port" ]]; then
        proxy_container_https_port="$proxy_container_port"
      fi
    fi
  done

  # add the labels for traefik here
  # any `http:80` port mapping is treated as a `web` traefik entrypoint
  # any `https:443` port mapping is treated as a `websecure` traefik entrypoint
  if [[ -n "$is_app_listening" ]]; then
    app_domains="$(plugn trigger domains-list "$APP")"
    if [[ -n "$app_domains" ]]; then
      traefik_domains="$(echo "$app_domains" | xargs)"
      traefik_domains="${traefik_domains// /\\\`,\\\`}"
    fi

    output="--label traefik.enable=true"
    if [[ -n "$proxy_container_http_port" ]] || [[ -n "$proxy_container_http_port_candidate" ]]; then
      if [[ -z "$proxy_container_http_port" ]]; then
        dokku_log_warn "Warning: http:80 port mapping not found"
        dokku_log_warn "Utilizing first http port mapping, http:$proxy_host_http_port_candidate:$proxy_container_http_port_candidate"
        proxy_container_http_port="$proxy_container_http_port_candidate"
      fi

      output="$output --label traefik.http.services.$APP-$PROC_TYPE.loadbalancer.server.port=$proxy_container_http_port"
      output="$output --label traefik.http.routers.$APP-$PROC_TYPE.entrypoints=web"
      if [[ -n "$traefik_domains" ]]; then
        output="$output --label \"traefik.http.routers.$APP-$PROC_TYPE.rule=Host(\\\`$traefik_domains\\\`)\""
        echo "# THIS FILE IS GENERATED BY DOKKU - DO NOT EDIT, YOUR CHANGES WILL BE OVERWRITTEN" >"$app_urls_path"
        xargs -I{} echo "http://{}" <<<"$(echo "${app_domains}" | tr ' ' '\n' | sort -u)" >>"$app_urls_path"
      fi
    fi

    if [[ -n "$proxy_container_https_port" ]] || [[ -n "$proxy_container_https_port_candidate" ]]; then
      if [[ -z "$proxy_container_https_port" ]]; then
        dokku_log_warn "Warning: https:443 port mapping not found"
        dokku_log_warn "Utilizing first https port mapping, http:$proxy_host_https_port_candidate:$proxy_container_https_port_candidate"
        proxy_container_https_port="$proxy_container_https_port_candidate"
      fi

      output="$output --label traefik.http.services.$APP-$PROC_TYPE-secure.loadbalancer.server.port=$proxy_container_https_port"
      output="$output --label traefik.http.routers.$APP-$PROC_TYPE-secure.entrypoints=websecure"
      if [[ -n "$traefik_domains" ]]; then
        output="$output --label \"traefik.http.routers.$APP-$PROC_TYPE-secure.rule=Host(\\\`$traefik_domains\\\`)\""
        echo "# THIS FILE IS GENERATED BY DOKKU - DO NOT EDIT, YOUR CHANGES WILL BE OVERWRITTEN" >"$app_urls_path"
        xargs -I{} echo "https://{}" <<<"$(echo "${app_domains}" | tr ' ' '\n' | sort -u)" >>"$app_urls_path"
      fi
    fi
  fi

  echo -n "$STDIN$output"
}

trigger-traefik-vhosts-docker-args-process-deploy "$@"