From 408a342bec95f2aa18e183e8bfa772dfb62defde Mon Sep 17 00:00:00 2001
From: Steven Baltakatei Sandoval <baltakatei@gmail.com>
Date: Mon, 29 Jun 2020 20:30:50 +0000
Subject: [PATCH] feat(bkgpslog):Implement compression and encryption

Add compression option.

Implement compression of output files.

Implement encryption of output files.
---
 exec/bkgpslog | 46 +++++++++++++++++++++++++++++++++++-----------
 1 file changed, 35 insertions(+), 11 deletions(-)

diff --git a/exec/bkgpslog b/exec/bkgpslog
index 21c5fc0..f7d1b18 100755
--- a/exec/bkgpslog
+++ b/exec/bkgpslog
@@ -151,8 +151,11 @@ showUsage() {
     echoerr "    -o, --output [ directory ]"
     echoerr "            Specify output directory to save logs."
     echoerr
+    echoerr "    -c, --compress"
+    echoerr "            Compress output with gzip (before encryption if enabled)."
+    echoerr
     echoerr "EXAMPLE: (bash script lines)"
-    echoerr "/bin/bash bkgpslog -e \\"
+    echoerr "/bin/bash bkgpslog -e -c \\"
     echoerr "-r age1mrmfnwhtlprn4jquex0ukmwcm7y2nxlphuzgsgv8ew2k9mewy3rs8u7su5 \\"
     echoerr "-r age1ala848kqrvxc88rzaauc6vc5v0fqrvef9dxyk79m0vjea3hagclswu0lgq \\"
     echoerr "-o ~/Sync/Location"
@@ -194,6 +197,7 @@ processArguments() {
 	    -e | --encrypt) OPTION_ENCRYPT="true"; vbm "DEBUG:Encrypted output mode enabled.";;
 	    -r | --recipient) # Add 'age' recipient via public key string
 		recPubKeys+=("$2"); vbm "pubkey added:""$2"; shift;;
+	    -c | --compress) OPTION_COMPRESS="true"; vbm "DEBUG:Compressed output mode enabled.";;
 	    *) echoerr "ERROR: Unrecognized argument."; exit 1;; # Handle unrecognized options.
 	esac
 	shift
@@ -276,20 +280,40 @@ main() {
 	if checkapp age; then # Check that age is available.
 	    for pubkey in "${recPubKeys[@]}"; do # Validate recipient pubkey strings by forming test message
 		vbm "DEBUG:Testing pubkey string:$pubkey"
-		if ! echo "butts" | age -a -r "$pubkey" 1>/dev/null; then
-		    yell "ERROR:Exit code ""$?"". Invalid recipient pubkey string. Exiting."; exit 1;
-		else
+		if echo "butts" | age -a -r "$pubkey" 1>/dev/null; then
 		    # Form age recipient string
 		    recipients="$recipients""-r $pubkey ";
-		    vbm "Added pubkey:""$pubkey";
+		    vbm "Added pubkey for forming age recipient string:""$pubkey";
 		    vbm "DEBUG:recipients:""$recipients";
+		else
+		    yell "ERROR:Exit code ""$?"". Invalid recipient pubkey string. Exiting."; exit 1;
 		fi
 	    done
 	    vbm "DEBUG:Finished processing recPubKeys array";
+	    # Form age command string
+	    CMD_ENCRYPT=" | age ""$recipients ";
+	    CMD_ENCRYPT_SUFFIX=".age";
 	else
 	    yell "ERROR:Encryption enabled but \"age\" not found. Exiting."; exit 1;
 	fi
+    else
+	CMD_ENCRYPT="";
+	CMD_ENCRYPT_SUFFIX="";
+	vbm "DEBUG:Encryption not enabled."
     fi
+
+    if [[ "$OPTION_COMPRESS" = "true" ]]; then # Check if compression option active
+	if checkapp gzip; then # Check if gzip available
+	    CMD_COMPRESS=" | gzip ";
+	    CMD_COMPRESS_SUFFIX=".gz";
+	else
+	    yell "ERROR:Compression enabled but \"gzip\" not found. Exiting."; exit 1;
+    else
+	CMD_COMPRESS="";
+	CMD_COMPRESS_SUFFIX="";
+	vbm "DEBUG:Compression not enabled."
+    fi
+    
     
     if checkapp gpspipe && checkdir "$DIROUT"; then
 	
@@ -320,15 +344,15 @@ main() {
 	    ((debugCounter++))
       	    # Determine output file paths (time is start of buffer period)
 	    FILEOUT_BASENAME="$(dateTimeShort)""--P""$bufferTTL""S..""$SCRIPT_HOSTNAME""_location" ; # ISO-8601 YYYYmmddTHHMMSS+zzP[$bufferTTL]S
-	    FILEOUT_NMEA="$FILEOUT_BASENAME".nmea ;
-	    FILEOUT_GPX="$FILEOUT_BASENAME".gpx ;
-	    FILEOUT_KML="$FILEOUT_BASENAME".kml ;
+	    FILEOUT_NMEA="$FILEOUT_BASENAME".nmea"$CMD_COMPRESS_SUFFIX""$CMD_ENCRYPT_SUFFIX" ;
+	    FILEOUT_GPX="$FILEOUT_BASENAME".gpx"$CMD_COMPRESS_SUFFIX""$CMD_ENCRYPT_SUFFIX" ;
+	    FILEOUT_KML="$FILEOUT_BASENAME".kml"$CMD_COMPRESS_SUFFIX""$CMD_ENCRYPT_SUFFIX" ;
 	    # Fill buffer
 	    buffer="$(timeout "$bufferTTL""s" gpspipe -r)"; # Record gpspipe nmea data to buffer for bufferTTL seconds
 	    # Process and save buffers
-	    echo "$buffer"                                     > "$DIROUT"/"$FILEOUT_NMEA" & # Save NMEA format
-	    echo "$buffer" | gpsbabel -i nmea -f - -o gpx -F - > "$DIROUT"/"$FILEOUT_GPX"  & # Save GPX format
-	    echo "$buffer" | gpsbabel -i nmea -f - -o kml -F - > "$DIROUT"/"$FILEOUT_KML"  & # Save KML format
+	    echo "$buffer"                                     "$CMD_COMPRESS" "$CMD_ENCRYPT" > "$DIROUT"/"$FILEOUT_NMEA" & # Save NMEA format
+	    echo "$buffer" | gpsbabel -i nmea -f - -o gpx -F - "$CMD_COMPRESS" "$CMD_ENCRYPT" > "$DIROUT"/"$FILEOUT_GPX" & # Save GPX format
+	    echo "$buffer" | gpsbabel -i nmea -f - -o kml -F - "$CMD_COMPRESS" "$CMD_ENCRYPT" > "$DIROUT"/"$FILEOUT_KML" & # Save KML format
 	    vbm "DEBUG:Completed buffer session $debugCounter ." 1>&2;
 	    # Reset buffer and filenames
 	    unset buffer FILEOUT_BASENAME FILEOUT_NMEA FILEOUT_GPX FILEOUT_KML;
-- 
2.30.2