#!/bin/bash
######################################################################
#
#   tcar - The CentOS Artwork Repository automation tool.
#   Copyright © 2014 The CentOS Artwork SIG
#
#   This program is free software; you can redistribute it and/or
#   modify it under the terms of the GNU General Public License as
#   published by the Free Software Foundation; either version 2 of the
#   License, or (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
#   General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program; if not, write to the Free Software
#   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
#   Alain Reguera Delgado <al@centos.org.cu>
#   39 Street No. 4426 Cienfuegos, Cuba.
#
######################################################################

# Standardizes the way file conditional expressions are applied to
# files.  Here is where tcar.sh script answers questions like: is the
# file a regular file or a directory?  Or, is it a symbolic link? Or
# even, does it have execution rights, etc.  If the verification fails
# somehow at any point, an error message is output and tcar.sh script
# finishes its execution.
function tcar_checkFiles {

    # Reset text domain locally, in order to prevent this function
    # from using the last text domain definition. By default all
    # common functions do use the same MO file.
    local TEXTDOMAIN="${TCAR_SCRIPT_NAME}"

    # Initialize local array variables.
    local -a CONDITION_COMMAND
    local -a CONDITION_PATTERN
    local -a CONDITION_MESSAGE

    # Initialize local counter.
    local COUNTER=0

    OPTIND=1
    while getopts "i:,r,m:,n,d,e,f,h,x" OPTION "${@}"; do

        case "${OPTION}" in

            d )
                CONDITION_COMMAND[((++${#CONDITION_COMMAND[*]}))]='/usr/bin/test'
                CONDITION_PATTERN[((++${#CONDITION_PATTERN[*]}))]='-d'
                CONDITION_MESSAGE[((++${#CONDITION_MESSAGE[*]}))]="`gettext "isn't a directory."`"
                ;;

            e )
                CONDITION_COMMAND[((++${#CONDITION_COMMAND[*]}))]='/usr/bin/test'
                CONDITION_PATTERN[((++${#CONDITION_PATTERN[*]}))]='-e'
                CONDITION_MESSAGE[((++${#CONDITION_MESSAGE[*]}))]="`gettext "doesn't exist."`"
                ;;

            f )
                CONDITION_COMMAND[((++${#CONDITION_COMMAND[*]}))]='/usr/bin/test'
                CONDITION_PATTERN[((++${#CONDITION_PATTERN[*]}))]='-f'
                CONDITION_MESSAGE[((++${#CONDITION_MESSAGE[*]}))]="`gettext "isn't a regular file."`"
                ;;

            h )
                CONDITION_COMMAND[((++${#CONDITION_COMMAND[*]}))]='/usr/bin/test'
                CONDITION_PATTERN[((++${#CONDITION_PATTERN[*]}))]='-h'
                CONDITION_MESSAGE[((++${#CONDITION_MESSAGE[*]}))]="`gettext "isn't a symbolic link."`"
                ;;

            x )
                CONDITION_COMMAND[((++${#CONDITION_COMMAND[*]}))]='/usr/bin/test'
                CONDITION_PATTERN[((++${#CONDITION_PATTERN[*]}))]='-x'
                CONDITION_MESSAGE[((++${#CONDITION_MESSAGE[*]}))]="`gettext "isn't an executable file."`"
                ;;

            i )
                local MIME=${OPTARG}
                CONDITION_COMMAND[((++${#CONDITION_COMMAND[*]}))]='/usr/bin/file'
                CONDITION_PATTERN[((++${#CONDITION_PATTERN[*]}))]='-bi'
                CONDITION_MESSAGE[((++${#CONDITION_MESSAGE[*]}))]="`eval_gettext "isn't a \\\"\\\$MIME\\\" file."`"
                ;;

            m )
                CONDITION_COMMAND[((++${#CONDITION_COMMAND[*]}))]='match'
                CONDITION_PATTERN[((++${#CONDITION_PATTERN[*]}))]="${OPTARG}"
                CONDITION_MESSAGE[((++${#CONDITION_MESSAGE[*]}))]="`gettext "doesn't match its pattern."`"
                ;;

            n )
                CONDITION_COMMAND[((++${#CONDITION_COMMAND[*]}))]="/bin/rpm"
                CONDITION_PATTERN[((++${#CONDITION_PATTERN[*]}))]="-q --quiet"
                CONDITION_MESSAGE[((++${#CONDITION_MESSAGE[*]}))]="`gettext "isn't installed in the system."`"
                ;;

        esac
    done

    # Clean up positional parameters to reflect the fact that options
    # have been processed already.
    shift $(( ${OPTIND} - 1 ))

    # Define list of files we want to apply verifications to, now that
    # all option-like arguments have been removed from positional
    # parameters list so we are free to go with the verifications.
    local FILE=''
    local FILES=${@}

    # Verify existence of files to prevent tcar.sh script from
    # using the current location in cases when it shouldn't (e.g.,
    # here it is expecting a list of files to process.).
    if [[ -z ${FILES} ]];then
        tcar_printMessage "`gettext "No file for processing found."`" --as-error-line
    fi

    for FILE in ${FILES};do

        until [[ ${COUNTER} -eq ${#CONDITION_PATTERN[*]} ]];do

            case ${CONDITION_COMMAND[${COUNTER}]} in

                "/usr/bin/test" | "/bin/rpm" )
                ${CONDITION_COMMAND[${COUNTER}]} ${CONDITION_PATTERN[${COUNTER}]} ${FILE} \
                    || tcar_printMessage "${FILE} ${CONDITION_MESSAGE[${COUNTER}]}" --as-error-line
                ;;

                "/usr/bin/file" )
                if [[ ! $(${CONDITION_COMMAND[${COUNTER}]} ${CONDITION_PATTERN[${COUNTER}]} ${FILE}) =~ "^${MIME}" ]];then
                    tcar_printMessage "${FILE} ${CONDITION_MESSAGE[${COUNTER}]}" --as-error-line
                fi
                ;;

                "match" )
                if [[ ! ${FILE} =~ "${CONDITION_PATTERN[${COUNTER}]}" ]];then
                    tcar_printMessage "${FILE} ${CONDITION_MESSAGE[${COUNTER}]}" --as-error-line
                fi
                ;;

                * )
                tcar_printMessage "`gettext "The condition command provided isn't supported."`" --as-error-line
                ;;

            esac

            COUNTER=$((${COUNTER} + 1))

        done

    done

}