recover file name from DiskLRUCache

renamer.sh

#!/bin/bash

#
# recover file name from DiskLRUCache generated file (kakaotalk cache file.. etc)
#
# how to
# adb pull /sdcard/Android/data/com.kakao.talk/ kakaotalk
# renamer.sh kakaotalk output
#

display_usage() { 
    echo "renamer v1.0" 
    echo "recover unknown file name v1.0" 
    echo -e "  Usage:\n    renamer.sh [source dir] [target dir]" 
}

if [  $# -le 1 ] 
then 
    display_usage
    exit 1
fi 

SOURCE_DIR=${1}
TARGET_DIR=${2}

if [ "${SOURCE_DIR}" = "${TARGET_DIR}" ]; then
    echo "not allowed."
fi

mkdir -pv ${TARGET_DIR}

for i in $(find $SOURCE_DIR); do # Not recommended, will break on whitespace
    INPUT=${i}
    result=`file -b $INPUT`
    filedate=`date -r $INPUT "+%Y-%m-%d_%H-%M-%S"`
    #remove SOURCE_DIR
    rename=${INPUT#"$SOURCE_DIR"}
    #remove /
    rename=${rename#"/"}
    #remove =
    rename=${rename#"="}
    #remove :
    rename=${rename#":"}
    #change / from _
    rename=${rename//[\/]/_}

    DATE=${filedate}

    #echo $rename $SOURCE_DIR $TARGET_DIR
    if [[ $result =~ JPEG ]]; then
        DATE=$(exiftool -quiet -tab -dateformat "%Y:%m:%d_%H-%M-%S" -json -DateTimeOriginal "${INPUT}" | jq --raw-output '.[].DateTimeOriginal')
        if [ "$DATE" == "null" ]  # If exif extraction with DateTimeOriginal failed
        then
            DATE=$(exiftool -quiet -tab -dateformat "%Y:%m:%d_%H-%M-%S" -json -MediaCreateDate "${INPUT}" | jq --raw-output '.[].MediaCreateDate')
        fi

        if [ "$DATE" == "null" ]  # If exif extraction with MediaCreateDate failed
        then
            DATE=$(exiftool -quiet -tab -dateformat "%Y:%m:%d_%H-%M-%S" -json -CreateDate "${INPUT}" | jq --raw-output '.[].CreateDate')
        fi

        if [ "$DATE" == "null" ]  # If exif extraction with CreateDate failed
        then
            DATE=$(exiftool -quiet -tab -dateformat "%Y:%m:%d_%H:%M:%S" -json -ModifyDate "${INPUT}" | jq --raw-output '.[].ModifyDate')
        fi

        if [ -z "$DATE" ] || [ "$DATE" == "null" ] # If exif extraction failed
        then
            DATE=$filedate
        fi
        OUTPUT=${TARGET_DIR}/${DATE}_${rename}.jpg
        :
    elif [[ $result =~ PNG ]]; then 
        OUTPUT=${TARGET_DIR}/${DATE}_${rename}.png
        :
    elif [[ $result =~ GIF ]]; then 
        OUTPUT=${TARGET_DIR}/${DATE}_${rename}.gif
        :
    elif [[ $result =~ text ]]; then
        OUTPUT=${TARGET_DIR}/${DATE}_${rename}.txt
        :
    elif [[ $result =~ MP4 ]]; then 
        OUTPUT=${TARGET_DIR}/${DATE}_${rename}.mp4
        :
    elif [[ $result =~ vCard ]]; then 
        OUTPUT=${TARGET_DIR}/${DATE}_${rename}.vcard
        :
    elif [[ $result =~ M4A ]]; then 
        OUTPUT=${TARGET_DIR}/${DATE}_${rename}.m4a
        :
    elif [[ $result =~ 3GPP ]]; then 
        OUTPUT=${TARGET_DIR}/${DATE}_${rename}.3gpp
        :
    elif [[ $result =~ directory ]]; then 
        continue
        :
    elif [[ $result =~ empty ]]; then 
        continue
        :
    else
        echo ${INPUT} is unknown file : $result , date: $filedate
        continue
    fi

    #rsync -ah --progress ${INPUT} ${OUTPUT}
    cp ${INPUT} ${OUTPUT}
done