#!/bin/bash
#
# Author: Georg Voell - georg.voell@standby.cloud
# Version: @(#)filecheck 3.2.0 11.09.2024 (c)2024 Standby.cloud
# Licensed under the Universal Permissive License v 1.0 as shown at https://oss.oracle.com/licenses/upl/
#
# This script can be used free of charge. Use it as is or customize as needed. It is not guaranteed to be
# error free and you will not be reimbursed for any damage it may cause.
#
#@  Do some actions with files.
#@
#@Usage: filecheck [options] filename
#@  Options:
#@    -h, --help   : Displays helptext.
#@    -v, --version: Displays the version of the script.
#@    -x           : Test if filename is executable. If filename can't be found, try to find it in path.
#@    -b           : Test if filename is a binary file.
#@    -f           : Test if filename exists and is a regulary file.
#@    -l           : Test if filename exists and is a symbolic link.
#@    -w           : Test if filename is writable.
#@    -d           : Test if filename is a directory.
#@    -z           : Test if filename is a zip file and not corrupt.
#@    -s           : Test if filename exists and is not empty.
#@    -sl          : Test if filename exists and has more than 1 line.
#@    -rm          : Test if filename exists and then remove it.
#@    -fc          : Test if filename was accessed no longer than 179 minutes ago (ca. 3 hours).
#@    -fy          : Test if filename was created no longer than 1339 minutes ago (ca. 1 day).
#@    -fw          : Test if filename was created no longer than 10079 minutes ago (ca. 1 week).
#@    -fmax        : Test if filename was modified no longer than 29 minutes ago.
#@    -fmin        : Test if filename was modified no longer than 15 minutes ago.
#@    -html        : Test if filename is valid html.
#@    -json        : Test if filename is valid json.
#@  Filename: Name of file to test.
#
# Update history:
#
# V 1.0.0 26.10.2017 New version
# V 1.0.1 15.07.2018 More options
# V 2.0.0 09.07.2019 Also look for executable files in $HOME/bin
# V 3.0.0 27.04.2020 Renamed script from filetest to filecheck (filetest is a build in cmd)
# V 3.0.1 19.05.2020 Return "./$file" if $file is in local dir
# V 3.0.2 11.06.2020 Using library
# V 3.1.0 05.06.2023 New copyright
# V 3.1.1 07.09.2023 Check if alias exists with option -x
# V 3.1.2 27.07.2024 Additional options
# V 3.2.0 11.09.2024 New minor version
# V 3.2.1 10.10.2024 More options
#

# Find executable bash library and source it
lib=`which lib.bash 2>/dev/null | sed 's|^no 'lib.bash' in .*||'`
if [ "$lib" != "" ]; then
	source "$lib"
else
	progdir=`dirname "$0"`
	if [ -r "${progdir}/lib.bash" ]; then
		source "${progdir}/lib.bash"
	else
		echo "Unexpected error: Unable to locate bash library 'lib.bash'."
		exit 1
	fi
fi

# Returns true if file is regular file and not empty
# We have to test this with 'wc' because -s option won't work on Solaris
function FileNotEmpty() {
	local filename=${1}
	local bytes=0
	
	if [ -f "$filename" ]; then
		bytes=`cat "$filename" | wc -c`
	fi
	
	if [ $bytes -gt 0 ]; then
		echo true
	else
		echo false
	fi
}

# Return number of lines in file
function CountLines() {
	local filename=${1}
	local lines=0
	
	if [ -f "$filename" ]; then
		lines=`cat "$filename" | wc -l`
	fi

	echo $lines
}

# Preset
filnam=""
option=""

# Check parameters: Loop until all parameters are used up
while [ $# -gt 0 ]; do
	pname=${1}
	case "$pname" in
		-v | --version)
			shift
			showversion=true
			;;
		-h | --help)
			shift
			showhelp=true
			;;
		*)
			shift
			paramck=`echo "$pname" | grep '^-'` # Types don't begin with '-'
			if [ "$paramck" != "" ]; then
				if [ "$option" = "" ]; then
					option=`echo "$pname" | tolower`
				else
					errstr="Option '$option' already specified. Unknown additional option '$pname'."
				fi
			else
				if [ "$filnam" = "" ]; then
					filnam="$pname"
				else
					errstr="Filename '$filnam' already specified. Unknown additional parameter: '$pname'."
				fi
			fi
	esac
done

# Plausibility check
if [ "$option" = "" -o "$filnam" = "" ]; then
	errstr="Please specify an option and a filename e.g. '$progstr -x yum'"
fi

# Display help or error message
DisplayHelp

case "$option" in
	-x) result=`alias | grep "alias ${filnam}=" | cut -d"'" -f2 | cut -d" " -f1`
		if [ "$result" != "" ]; then
			filnam="$result"
		fi
		if [ -f "$filnam" -a -x "$filnam" ]; then
			# We have to check if it is a file first - otherwise it may is a directory
			dname=`dirname "$filnam"`
			if [ "$dname" = "." ]; then
				dname=`pwd`
				bname=`basename "$filnam"`
				echo "${dname}/$bname"
			else
				echo "$filnam"
			fi
		else
			# '2>/dev/null' needed for Linux, sed needed for Solaris 10
			resstr=`which "$filnam" 2>/dev/null | sed 's|^no '$filnam' in .*||'`
			if [ "$resstr" != "" ]; then
				echo "$resstr"
			fi
		fi ;;

	-f) if [ -f "$filnam" ]; then
			echo "$filnam"
		fi ;;
		
	-l) if [ -L "$filnam" ]; then
			echo "$filnam"
		fi ;;
		
	-w) if [ -w "$filnam" ]; then
			echo "$filnam"
		fi ;;
		
	-b) if [ `FileNotEmpty "$filnam"` = true ]; then
			file=`which file 2>/dev/null | sed 's|^no '$filnam' in .*||'`
			if [ "$file" != "" ]; then
				resstr=`"$file" -b --mime-encoding "$filnam"`
			else
				resstr=`grep '' "$filnam" | cut -d' ' -f 1 | tolower`
			fi
			
			if [ "$resstr" = "binary" ]; then
				echo "$filnam"
			fi
		fi ;;
		
	-d) if [ -d "$filnam" ]; then
			echo "$filnam"
		fi ;;

	-z) if [ `FileNotEmpty "$filnam"` = true ]; then
			unzip=`which unzip 2>/dev/null | sed 's|^no '$filnam' in .*||'`
			if [ "$unzip" != "" ]; then
				$unzip -t "$filnam" >/dev/null 2>&1
				stat=$?
				
				if [ $stat -eq 0 ]; then
					echo "$filnam"
				fi
			fi
		fi ;;

	-s) if [ `FileNotEmpty "$filnam"` = true ]; then
			echo "$filnam"
		fi ;;
		
	-sl) if [ `CountLines "$filnam"` -gt 1 ]; then
			echo "$filnam"
		fi ;;

	-rm) if [ -f "$filnam" ]; then
			rm -f "$filnam" 2>/dev/null
			exitcode=$?
		fi ;;

	# amin = access tine, mmin = modification time, cmin = change time, Bmin = Creation time (inode creation)
	# Get infos about the file with: stat $filnam

	-fc)
		minutes=179
		
		if [ "$OS" = "Darwin" ]; then
			resstr=`find "$filnam" -type f -Bmin -$minutes 2> /dev/null`
		else
			# assuming that noatime is set for disk -> then we get creation date in atime
			resstr=`find "$filnam" -type f -amin -$minutes 2> /dev/null`
		fi
		
		if [ "$resstr" != "" ]; then
			echo "$filnam"
		fi
		;;
	-fy | -fw)
		if [ "$option" = "-fy" ]; then
			minutes=1339
		else
			minutes=10079
		fi
		
		resstr=`find "$filnam" -type f -cmin -$minutes 2> /dev/null`
		if [ "$resstr" != "" ]; then
			echo "$filnam"
		fi
		;;
	-fmin | -fmax)
		if [ "$option" = "-fmin" ]; then
			minutes=15
		else
			minutes=29
		fi
		
		resstr=`find "$filnam" -type f -mmin -$minutes 2> /dev/null`
		if [ "$resstr" != "" ]; then
			echo "$filnam"
		fi
		;;

	-html) if [ `FileNotEmpty "$filnam"` = true ]; then
			file=`which file 2>/dev/null | sed 's|^no '$filnam' in .*||'`
			if [ "$file" != "" ]; then
				resstr=`"$file" -b --mime-type "$filnam"`
				if [ "$resstr" = "text/html" ]; then
					echo "$filnam"
				fi
			fi
		fi ;;
		
	-json) if [ `FileNotEmpty "$filnam"` = true ]; then
			jq=`which jq 2>/dev/null | sed 's|^no '$filnam' in .*||'`
			if [ "$jq" != "" ]; then
				cat "$filnam" | "$jq" >/dev/null 2>&1
				stat=$?
				
				if [ $stat -eq 0 ]; then
					echo "$filnam"
				fi
			fi
		fi ;;
		
	*) errormsg 1 "($progstr) Invalid option '$option'."
		exitcode=1
esac

exit $exitcode