#!/bin/sh

# Script purpose:
# Copy FileMaker backups to remote FTP server for backups.
# Rotate remote copies of backups on FTP server.

# Written by William Smith, 318, Inc.
# August 26, 2015

# Notes:
# This script executes when called by the com.318.FTPFileMakerBackups.plist launch daemon
# in /Library/LaunchDaemons. Log files are located in /Library/Logs



##### Definitions

scriptname=$( /usr/bin/basename -s .sh "$0" )
filemakerbackupfolder="/Library/FileMaker Server/Data/Backups"
ftpaddress="192.168.5.250"
ftpusername="ftpadmin"
ftpuserpassword="p@55w0rd"
workingfolder="/private/tmp/fmpftpfiles"
logfolder="/Library/Logs/$scriptname"
logfile="$logfolder/$scriptname - $( /bin/date '+%Y-%m-%d' ).log"



###### Functions


function logresult()	{
	if [ $? = 0 ] ; then
	  /bin/date "+%Y-%m-%d %H:%M:%S	$1" >> "$logfile"
	else
	  /bin/date "+%Y-%m-%d %H:%M:%S	$2" >> "$logfile"
	fi
}



###### Logging


# start the log
mkdir -p "$logfolder"

logresult "--------------------- Begin Script ---------------------"

# rotate logs -- delete all but the 14 most recent log files
deleteoldlogs=$( /bin/ls -1t "$logfolder/$scriptname"*.log | /usr/bin/tail -n +15 )

while IFS= read -r afile
do
	logfilename=$( /usr/bin/basename "$afile" )
	/bin/rm "$afile"
	logresult "Deleting old log file: $logfilename." "No old logs to delete."
done <<< "$deleteoldlogs"



##### Create list of local FileMaker Server backup folders.

locallist=$( ls "$filemakerbackupfolder" )



##### Create list of remote backup files.

remotelist=$( curl -l ftp://$ftpaddress/ --user "$ftpusername:$ftpuserpassword" )

# create temporary working directory
mkdir -p "$workingfolder"
logresult "SUCCESS: Created temporary working directory: $workingfolder" "ERROR: Unable to create temporary working directory: $workingfolder"



##### Compare local list with remote list and
##### create archive of each local FileMaker backup not in the FTP server list.

echo "$locallist" | while IFS= read -r afile
do
	if [[ $remotelist != *"$afile"* ]] ; then
		zip -r "$workingfolder/$afile.zip" "$filemakerbackupfolder/$afile"
		logresult "SUCCESS: Created archive \"$afile.zip\"" "ERROR: Unable to create archive \"$afile.zip\""
	fi
done



##### Copy archives to FTP server.

ftp -inv $ftpaddress << End-Of-Session
user $ftpusername $ftpuserpassword
binary
lcd $workingfolder
mput *
bye
End-Of-Session

logresult "SUCCESS: Transferred new archive files to FTP server $ftpaddress" "ERROR: Unable to transfer new archive files to FTP server $ftpaddress"



##### Remove remote backups not on local server.

echo "$remotelist" | while IFS= read -r afile
do
	afilename=$( echo ${afile%.*} )
	if [[ "$locallist" != *"$afilename"* ]] ; then
		curl -v -u "$ftpusername:$ftpuserpassword" "ftp://$ftpaddress" -Q "DELE $afile"
		logresult "SUCCESS: Deleted remote file \"$afile\"" "ERROR: Unable to delete remote file \"$afile\""
	fi
done



##### Clean up

# delete temporary working directory and contents
rm -R "$workingfolder"
logresult "SUCCESS: Deleted temporary working directory: $workingfolder" "ERROR: Unable to delete temporary working directory: $workingfolder"
echo "" >> $logfile

exit 0