From e65802007fc95613d9b2e0dbe68dd55c70f97fd1 Mon Sep 17 00:00:00 2001
From: Christian Hesse <mail@eworm.de>
Date: Wed, 3 Mar 2021 10:42:14 +0100
Subject: global-functions: introduce and use $QuotedPrintable

Some mail clients do not like unencoded utf-8 in subject... Let's
encode in quoted-printable to fix.
---
 global-functions | 43 +++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 41 insertions(+), 2 deletions(-)

diff --git a/global-functions b/global-functions
index 382722a..177cd4f 100644
--- a/global-functions
+++ b/global-functions
@@ -35,6 +35,7 @@
 :global LogPrintExit2;
 :global MkDir;
 :global ParseKeyValueStore;
+:global QuotedPrintable;
 :global RandomDelay;
 :global RequiredRouterOS;
 :global ScriptFromTerminal;
@@ -550,6 +551,42 @@
   :return $Result;
 }
 
+# convert string to quoted-printable
+:global QuotedPrintable do={
+  :local Input [ :tostr $1 ];
+
+  :if ([ :len $Input ] = 0) do={
+    :return $Input;
+  }
+
+  :local Return "";
+  :local Chars ("\80\81\82\83\84\85\86\87\88\89\8A\8B\8C\8D\8E\8F\90\91\92\93\94\95\96\97" . \
+    "\98\99\9A\9B\9C\9D\9E\9F\A0\A1\A2\A3\A4\A5\A6\A7\A8\A9\AA\AB\AC\AD\AE\AF\B0\B1\B2\B3" . \
+    "\B4\B5\B6\B7\B8\B9\BA\BB\BC\BD\BE\BF\C0\C1\C2\C3\C4\C5\C6\C7\C8\C9\CA\CB\CC\CD\CE\CF" . \
+    "\D0\D1\D2\D3\D4\D5\D6\D7\D8\D9\DA\DB\DC\DD\DE\DF\E0\E1\E2\E3\E4\E5\E6\E7\E8\E9\EA\EB" . \
+    "\EC\ED\EE\EF\F0\F1\F2\F3\F4\F5\F6\F7\F8\F9\FA\FB\FC\FD\FE\FF");
+  :local Hex { "0"; "1"; "2"; "3"; "4"; "5"; "6"; "7"; "8"; "9"; "A"; "B"; "C"; "D"; "E"; "F" };
+
+  :for I from=0 to=([ :len $Input ] - 1) do={
+    :local Char [ :pick $Input $I ];
+    :local Replace [ :find $Chars $Char ];
+
+    :if ($Char = "=") do={
+      :set Char "=3D";
+    }
+    :if ([ :typeof $Replace ] = "num") do={
+      :set Char ("=" . ($Hex->($Replace / 16 + 8)) . ($Hex->($Replace % 16)));
+    }
+    :set Return ($Return . $Char);
+  }
+
+  :if ($Input = $Return) do={
+    :return $Input;
+  }
+
+  :return ("=\?utf-8\?Q\?" . $Return . "\?=");
+}
+
 # delay a random amount of seconds
 :set RandomDelay do={
   :global GetRandomNumber;
@@ -806,8 +843,9 @@
   :global EmailGeneralCc;
   :global EmailQueue;
 
-  :global LogPrintExit2;
   :global IfThenElse;
+  :global LogPrintExit2;
+  :global QuotedPrintable;
 
   :if ([ :len $EmailGeneralTo ] = 0) do={
     :return false;
@@ -818,7 +856,8 @@
   }
   :local Signature [ / system note get note ];
   :set ($EmailQueue->[ :len $EmailQueue ]) {
-    to=$EmailGeneralTo; cc=$EmailGeneralCc; subject=("[" . $Identity . "] " . $Subject);
+    to=$EmailGeneralTo; cc=$EmailGeneralCc;
+    subject=[ $QuotedPrintable ("[" . $Identity . "] " . $Subject) ];
     body=($Message . \
       [ $IfThenElse ([ :len $Link ] > 0) ("\n\n" . $Link) "" ] . \
       [ $IfThenElse ([ :len $Signature ] > 0) ("\n-- \n" . $Signature) "" ]) };
-- 
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