#!/bin/bash

DAV_SERV="https://webdav.yandex.ru/backup/" # with path and trailing /
DAV_USER="юзер"
DAV_PASS="пароль"

DB_HOST="localhost"
DB_USER="root"
DB_PASS="пароль_бд"

STORE_PASS="пароль_архивов"                # Pass to encrypt file before uploading

# get list of backups
curl --user ${DAV_USER}:${DAV_PASS} -o backup-log.txt ${DAV_SERV}backup-log.txt &> /dev/null

# get list of existing databases
DBLIST="$(echo "show databases;" | /usr/bin/mysql -s -h ${DB_HOST} -u ${DB_USER} -p${DB_PASS} | /bin/grep -vE "^(information_schema)$")"    #"

# dump, compress and encrypt them
FILES_LIST=""
for DB in ${DBLIST}; do
    echo "Dumping ${DB}."
    FILENAME="$(date +%Y-%m-%d)-DB-${DB}.sql.lzma.gpg"
    /usr/bin/mysqldump -c -h ${DB_HOST} -u ${DB_USER} -p${DB_PASS} --databases ${DB} | \
    /usr/bin/xz -z -9 -q -F lzma --memlimit=150MiB | \
    /usr/bin/gpg --batch -q --no-tty --compress-algo none --cipher-algo AES --passphrase "${STORE_PASS}" -c > ${FILENAME}
    FILES_LIST="${FILES_LIST},${FILENAME}"
done

# upload compressed files
FILES_LIST="$(echo "${FILES_LIST}" | sed -r 's/^,(.+)$/\1/')"   # remove unneeded leading ','
#echo "${FILES_LIST}"
echo "Uploading to cloud."
if ! curl --user ${DAV_USER}:${DAV_PASS} -T {${FILES_LIST}} ${DAV_SERV}; then
    echo "Upload failed. removing files and exiting."
    FILES_LIST="$(echo "${FILES_LIST}" | tr ',' ' ')"   # convert ',' to spaces
    rm -f ${FILES_LIST}
    exit
fi

# remove compressed files
FILES_LIST="$(echo "${FILES_LIST}" | tr ',' ' ')"   # convert ',' to spaces
echo "Removing ${FILES_LIST}."
rm -f ${FILES_LIST}

# parse log and remove old backups
if [ -e backup-log.txt1 ]; then
    rm -f backup-log.txt1
    touch backup-log.txt1
fi

echo "Cleaning old backups."
NOW="$(date +%s)"
while read line; do
    FIRSTPART="$(echo "${line}" | cut -f1 -d ' ')"
    TIMESTAMP="$(echo "${line}" | sed -r 's/^([0-9]+) .*/\1/' )"
    if [ ! -z "${TIMESTAMP}" ] && [ "${FIRSTPART}" == "${TIMESTAMP}" ]; then
    let DDIF="NOW - TIMESTAMP"
    if [ "${DDIF}" -gt "2678400" ]; then        # 60 seconds *60*24*31 = 2678400 = month
        # remove file from cloud and skip line
        FILENAME="$(echo "${line}" | cut -f2- -d ' ')"
        if curl --user ${DAV_USER}:${DAV_PASS} --request DELETE "${DAV_SERV}${FILENAME}" &> /dev/null; then
        echo "${FILENAME} removed."
        else
        echo "Can't remove ${FILENAME}."
        echo "${line}" >> backup-log.txt1
        fi
    else
        echo "${line}" >> backup-log.txt1
    fi
    fi
done < backup-log.txt

echo "Fixing log."
for FILENAME in ${FILES_LIST}; do
    echo "${NOW} ${FILENAME}" >> backup-log.txt1
done
cat backup-log.txt1 > backup-log.txt
curl --user ${DAV_USER}:${DAV_PASS} -T backup-log.txt ${DAV_SERV}
rm -f backup-log.txt backup-log.txt1