#!/bin/bash
#
# "THE BEER-WARE LICENSE" (Revision 42):
# Matěj Cepl, <mcepl@cepl.eu> wrote this file.  As long as you retain
# this notice you can do whatever you want with this stuff. If we meet
# some day, and you think this stuff is worth it, you can buy me a beer
# in return.   Matěj Cepl
#
# Instructions for setting up appropriate folders on
# file.rdu.redhat.com see https://mojo.redhat.com/docs/DOC-14590
# See also variable URL_VARIANTS below for necessary configuration.
set -eu

DEBUG=1

debug() {
    if [ $DEBUG -eq 1 ] ; then
        printf "%s\n" "$@"
    fi
}

error() {
    printf "%s\n" "$@"
    exit 1
}

COMPRESSED_EXTENSIONS=('jpg' 'webm' 'ogg' 'gz' 'bz2' 'zip' \
                       'xz' 'odp' 'odt' 'ods' 'mp4' 'mp3' \
                       'png' 'pdf' 'apk' 'rpm' 'epub' 'mkv' \
                       'avi' 'jar' 'opus' 'ogv' 'flac' 'msi' \
                       'm4a')

# THE VARIABLE URL_VARIANTS IS MEANT TO BE EDITED. Change various
# attributes to correspond to your situation.
# If new section is added (as here I have also 'tmp' for fedorapeople.org)
# and the script has a symlink named as the section (so I have tmp as
# a symlink to this script) it saves the file to the location defined in
# such section when called under the other name.
# So, `tmp filename` saves file filename to fedorapeople for me.

export URL_VARIANTS="{
  'barstool': {
    'base_url': 'mcepl@shell.eng.rdu.redhat.com:public_html/',
    'target_url': 'http://file.rdu.redhat.com/~mcepl/',
    'shorten_api': 'https://url.corp.redhat.com/new?'
  },
  'wotan': {
    'base_url': 'wotan:Export/',
    'target_url': 'https://w3.suse.de/~mcepl/'
  },
  'tmp': {
    'base_url': 'fedorapeople.org:public_html/tmp/',
    'target_url': 'https://mcepl.fedorapeople.org/tmp/',
    'shorten_api': 'https://da.gd/s?url='
  }
}"

# THE ALTERNATIVE WAY
# 
# barstool_base_url='mcepl@shell.eng.rdu.redhat.com:public_html'
# barstool_target_url='http://file.rdu.redhat.com/~mcepl/'
# barstool_shorten_api='https://url.corp.redhat.com/new?'
# 
# wotan_base_url='wotan:Export/'
# wotan_target_url='https://w3.suse.de/~mcepl/'
# 
# tmp_base_url='fedorapeople.org:public_html/tmp/'
# tmp_target_url='https://mcepl.fedorapeople.org/tmp/'
# # tmp_shorten_api='http://is.gd/create.php?format=simple&url='
# tmp_shorten_api='https://da.gd/s?url='
# 
# get() { local x; x="${cur_conf}_$1"; echo "${!x}"; }
# 
# Example usage:
# 
# $ cur_conf=barstool
# 
# $ get base_url
# mcepl@shell.eng.rdu.redhat.com:public_html
# 
# $ get target_url
# http://file.rdu.redhat.com/~mcepl/
# 
# $ cur_conf=wotan
# 
# $ get base_url
# wotan:Export/

# Requires GNU sed
CMDNAME="$(basename "$0"|sed 's/./\L&/g')"
CONFIG="$(echo "$URL_VARIANTS" |tr "'" '"'|jq -r ".$CMDNAME")"
BASE_URL="$(echo "$CONFIG" | jq -r ".base_url")"
TARGET_URL="$(echo "$CONFIG" | jq -r ".target_url")"

[ $# -lt 1 ] && exit 1

for processed_file in "${@:1}" ; do
    st=$(stat -c "%s" "$processed_file")
    base_name="$(basename -- "$processed_file")"
    file_ext="${base_name##*.}"
    debug "size of $processed_file is ${st} bytes"
    debug "extension is ${file_ext}"

    # shellcheck disable=SC2076
    if [ "$st" -gt 1000000 ] && [[ ! " ${COMPRESSED_EXTENSIONS[*]} " =~ " ${file_ext} " ]] ; then
        debug "file ${processed_file} should be compressed (${st} b)"
        gzip --keep --best "${processed_file}" || error 'Compressing the file failed!'
        fname="${processed_file}.gz"
        trap 'rm -f "${fname}"' EXIT
    else
        debug "file ${processed_file} should not be compressed (${st} b)"
        fname="${processed_file}"
    fi

    chmod 644 "$fname"

    # To make scp happy
    modified_fname="$(echo "${fname}"|tr ':' '_')"
    mv -n "${fname}" "${modified_fname}"

    debug "Unshorten fname=${modified_fname}"

    scp "${modified_fname}" "${BASE_URL}"

    target_URL="${TARGET_URL}$(basename "${modified_fname}")"

    # Make target_URL into a safe URL
    safe_target_URL="${target_URL// /%20}"
    echo "${safe_target_URL}"

    # curl -s 'http://is.gd/create.php?format=simple&url=www.example.com'
    # http://is.gd/MOgh5q
    SHORTEN_API="$(echo "$CONFIG" | jq -r ".shorten_api")"
    if [ "x${SHORTEN_API}" != "xnull" ] ; then
        shortened_URL="$(curl -s "${SHORTEN_API}""${safe_target_URL}")"
        echo "${shortened_URL}"
    fi
done