mella

#!/usr/bin/env bash

# Mella - ownCloud upload via WebDAV using curl
# Copyright (c) 2016 by Florian Beer <fb@42dev.eu>

declare -r VERSION="1.1"
declare VERBOSE="--silent"
declare INSECURESSL=""

usage() {
cat <<EOM

Mella - ownCloud upload via WebDAV using curl
Copyright (c)2016 by Florian Beer <fb@42dev.eu>
Version ${VERSION}

This script comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions. See CC BY-NC-SA 4.0 for details.
https://creativecommons.org/licenses/by-nc-sa/4.0/

Usage
  $(basename ${0}) [OPTIONS] SOURCE TARGET

Options
  -c FILE  optional path to credentials file (default is ~/.mella.conf)
  -v       increase verbosity
  -k       allow curl to make "insecure" SSL connections and transfers
  -h       show this message
  -V       show version number

Example
  mella -c myconfig.conf backup.tar.gz http://demo.owncloud.org/remote.php/webdav/

Credentials file syntax
  username:password

EOM
}

parse_commandline_arguments() {
  while [[ ${1:0:1} = "-" ]] ; do
    local n=1
    local l=${#1}
    while [[ $n -lt $l ]] ; do
      case ${1:$n:1} in
        h)
          usage
          exit 0
          ;;
        c)
          if [[ $n -ne $(($l-1)) || ! -n ${2} ]]; then
            usage
            exit 1
          fi
          if [[ -f ${2} ]]; then
            CREDENTIALSFILE="${2}"
            shift
          else
            printf "Error: Credentials file '%s' not found\n" "${2}" >&2
            exit 3
          fi
          ;;
        v)
          VERBOSE="--verbose"
          ;;
        k)
          INSECURESSL="--insecure"
          ;;
        V)
          printf "Mella Version %s\n" "${VERSION}"
          exit 0
          ;;
        *)
          printf "Error: Unknown option %s\n" "${1}" >&2
          exit 4
          ;;
      esac
      n=$(($n+1))
    done
    shift
  done

  # No arguments where given
  if [[ ! -n ${1} ]]; then
    usage
    exit 0
  fi

  # Target is missing
  if [[ ! -n ${2} ]]; then
    printf "Error: Please specify target \n" >&2
    exit 5
  fi

  SOURCE="${1}"
  TARGET="${2}"
}

main() {
  parse_commandline_arguments "$@"

  # Check if curl is installed
  if ! hash "curl" &> /dev/null; then
    printf "Error: Mella requires curl but it's not installed.\n" >&2
    exit 1
  fi

  # Do we use a default configuration file?
  if [[ -f "$HOME/.mella.conf" && $CREDENTIALSFILE = "" ]]; then
    CREDENTIALSFILE="$HOME/.mella.conf"
  fi

  # Credentials file not found
  if [[ ! $CREDENTIALSFILE ]]; then
    printf "Error: No credentials file found.\n" >&2
    printf " Either create '~/.mella.conf' or specify custom path with '-c FILE'\n" >&2
    exit 1
  fi

  # # Credentials file must onyl be readable by current user
  # if [[ $(stat -c '%a' ${CREDENTIALSFILE}) != 600 ]]; then
  #   printf "Error: Credentials file is not secure. Please set 'chmod 600 %s'.\n" "${CREDENTIALSFILE}" >&2
  #   exit 1
  # fi

  credentials=$(< ${CREDENTIALSFILE})

  logger -t mella "Uploading \"$(basename ${SOURCE})\" to \"${TARGET}\""

  error=""
  # Upload with curl
  response=$(curl ${VERBOSE} ${INSECURESSL} --location --write-out %{http_code} --output /dev/null --user "${credentials}" --request PUT "${TARGET}/$(basename ${SOURCE})" --data-binary @"${SOURCE}")
  exit_code=$?

  if [[ ${exit_code} -gt 0 ]]; then
    if [[ ${VERBOSE} != "--verbose" ]]; then
      response=${response//000}
      error="curl error: Use '-v' to see error message."
    else
      response=${response//000}
      error=${response}
    fi
  fi

  if [[ ${exit_code} -eq 0 && ${response} != 000 && ${response} != 200 && ${response} != 201 && ${response} != 204 ]]; then
    error="Error uploading \"${SOURCE}\". HTTP error ${response}."
    exit_code=1
  fi

  if [[ ${exit_code} -gt 0 ]]; then
    logger -t mella "curl error ${response}"
    echo "${error}" >&2
    exit ${exit_code}
  else
    logger -t mella "Upload finished. HTTP response ${response}"
    exit 0
  fi

}

main "$@"