From 17d49005a89922e344cd6904f96b8fb1d6ebab78 Mon Sep 17 00:00:00 2001
From: Steven Baltakatei Sandoval <baltakatei@gmail.com>
Date: Mon, 29 Jun 2020 19:31:21 +0000
Subject: [PATCH] feat(bkgpslog):Add encryption option

Add encryption option via `age`. See:
https://github.com/FiloSottile/age .

Add `-e, --encrypt` option for specifying output to be encrypted.

Add `-r --recipient [ pubkey string ]` option for specifying
recipients of encrypted output.

Add code to validate recipient pubkey strings.

Not added (yet): encryption of output files.
---
 exec/bkgpslog | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/exec/bkgpslog b/exec/bkgpslog
index 8d1829a..b97f250 100755
--- a/exec/bkgpslog
+++ b/exec/bkgpslog
@@ -14,6 +14,7 @@ SCRIPT_DATE_SHORT="$(date +%Y%m%d)"          # Save current date in ISO-8601 for
 declare -Ag appRollCall # Associative array for storing app status
 declare -Ag fileRollCall # Associative array for storing file status
 declare -Ag dirRollCall # Associative array for storing dir status
+declare -a recPubKeys # for processArguments function
 
 #===BEGIN Declare local script functions===
 checkapp() {
@@ -140,8 +141,20 @@ showUsage() {
     echoerr "    -v, --verbose"
     echoerr "            Display debugging info."
     echoerr
+    echoerr "    -e, --encrypt"
+    echoerr "            Encrypt output."
+    echoerr
+    echoerr "    -r, --recipient [ pubkey string ]"
+    echoerr "            Specify recipient."
+    echoerr
     echoerr "    -o, --output [ directory ]"
     echoerr "            Specify output directory to save logs."
+    echoerr
+    echoerr "EXAMPLE: (bash script lines)"
+    echoerr "/bin/bash bkgpslog -e \\"
+    echoerr "-r age1mrmfnwhtlprn4jquex0ukmwcm7y2nxlphuzgsgv8ew2k9mewy3rs8u7su5 \\"
+    echoerr "-r age1ala848kqrvxc88rzaauc6vc5v0fqrvef9dxyk79m0vjea3hagclswu0lgq \\"
+    echoerr "-o ~/Sync/Location"
 } # Display information on how to use this script.
 showVersion() {
     echoerr "$SCRIPT_VERSION"
@@ -177,6 +190,9 @@ processArguments() {
 	    --version) showVersion; exit 1;; # Show version
 	    -v | --verbose) OPTION_VERBOSE="true"; vbm "DEBUG:Verbose mode enabled.";; # Enable verbose mode.
 	    -o | --output) if [ -d "$2" ]; then DIROUT="$2"; vbm "DEBUG:DIROUT:$DIROUT"; shift; fi ;; # Define output directory.
+	    -e | --encrypt) OPTION_ENCRYPT="true"; vbm "DEBUG:Encrypted output mode enabled.";;
+	    -r | --recipient) # Add 'age' recipient via public key string
+		recPubKeys+=("$2"); shift;;
 	    *) echoerr "ERROR: Unrecognized argument."; exit 1;; # Handle unrecognized options.
 	esac
 	shift
@@ -255,8 +271,20 @@ dateTimeShort(){
 } # Get date&time without separators
 main() {
     processArguments "$@" # Process arguments.
+    if [[ "$OPTION_ENCRYPT" = "true" ]]; then # Check if encryption option active.
+	if checkapp age; then # Check that age is available.
+	    for pubkey in "${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 ""$?"". Invalid recipient pubkey string. Exiting."; exit 1; fi
+	    done
+	else
+	    yell "ERROR:Encryption enabled but \"age\" not found. Exiting."; exit 1;
+	fi
+    fi
+    
     if checkapp gpspipe && checkdir "$DIROUT"; then
-
+	
 	# # Set script lifespan to end at start of next day
 	# if ! scriptTTL="$(timeUntilNextDay)"; then
 	#     if [[ "$scriptTTL" -eq 0 ]]; then
-- 
2.30.2