From fa9557ea594346ae1ab64a609869532be185f467 Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Thu, 12 Jan 2017 09:49:18 +0100
Subject: encrypt to recipients, if key available

---
 sendmailadvanced.in | 38 ++++++++++++++++++++++++++++++++++----
 1 file changed, 34 insertions(+), 4 deletions(-)

diff --git a/sendmailadvanced.in b/sendmailadvanced.in
index c1aef2e..547d9a0 100755
--- a/sendmailadvanced.in
+++ b/sendmailadvanced.in
@@ -17,7 +17,7 @@ verwendung() {
   exit 1
 }
 
-stempeln() {
+neueAdressaten() {
   oldIFS="${IFS}"
 
   IFS=','
@@ -33,7 +33,7 @@ stempeln() {
         tr -d "[:space:]"
     )"
     echo "${adressat}" | grep -q "\S" || continue
-    hashcash -b ${hashcash_bits} -Xm "${adressat}"
+    adressaten["${adressat}"]=1
   done
 
   adressatenString=""
@@ -41,6 +41,34 @@ stempeln() {
   IFS="${oldIFS}"
 }
 
+stempeln() {
+  hashcash -b ${hashcash_bits} -Xm "${!adressaten[@]}"
+}
+
+gpgAdressaten() {
+  local kenneAlle
+  for adressat in "${!adressaten[@]}"
+  do
+    if \
+      (
+        gpg --with-colons --list-public-keys "${adressat}" | \
+          grep '^uid:[mfuw]:' | \
+          cut -d: -f10 | \
+          tr '<>' '\n' | \
+          sort -u
+        echo "${adressat}"
+      ) | \
+        sort | \
+        uniq -d | \
+        grep -q '\S'
+    then
+      echo -n "-r ${adressat} "
+    else
+      echo -n "-r ${gpg_recipient} "
+    fi
+  done
+}
+
 datei=""
 encrypt=true
 stamp=true
@@ -147,6 +175,8 @@ fi
 (
   IFS=''
   adressatenString=""
+  unset adressaten
+  declare -A adressaten
   adressatenSammeln=false
   while read -r zeile
   do
@@ -159,7 +189,7 @@ fi
     fi
     if [ ! "${s:0:1}" == " " ]
     then
-      ${adressatenSammeln} && ${stamp} && stempeln
+      ${adressatenSammeln} && neueAdressaten
       adressatenSammeln=false
     fi
     ${adressatenSammeln} && adressatenString="${adressatenString}${s}"
@@ -181,7 +211,7 @@ fi
     done
   ) | \
   (
-    ${encrypt} && gpg -e -a -s -r ${gpg_recipient} || cat
+    ${encrypt} && gpg -e -a -s -r $(gpgAdressaten) || cat
   )
 ) | \
 (
-- 
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