[pmg-devel] [PATCH pmg-api v2 2/4] config: make smtputf8 configurable through the API

[Stoiko Ivanov <s.ivanov@proxmox.com>]

the flag is simply a boolean which is used to:
* add smtputf8_enable = no to postfix' main.cf if it is disabled
  (the default is to enable it, and not adding it unconditionally,
  should cause the fewest surprises for users with modified templates)
* decide if locally generated mail should be scanned for utf8 headers
  and addresses (to set the parameter to the MAIL command)

This should match postfix own implementation w.r.t. smtputf8 behavior.

Additionally, since quite a few users need to disable it because
their downstream servers do not support it (Zimbra, OpenXchange,
MS Exchange), this should make for a better user experience.

Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
---
best viewed with `git diff -w`
 src/PMG/Config.pm        |  7 +++++++
 src/PMG/Utils.pm         | 29 +++++++++++++++++------------
 src/templates/main.cf.in |  4 ++++
 3 files changed, 28 insertions(+), 12 deletions(-)

diff --git a/src/PMG/Config.pm b/src/PMG/Config.pm
index a0b1866..3ae68c1 100755
--- a/src/PMG/Config.pm
+++ b/src/PMG/Config.pm
@@ -676,6 +676,11 @@ sub properties {
 	    type => 'boolean',
 	    default => 0
 	},
+	smtputf8 => {
+	    description => "Enable SMTPUTF8 support in Postfix and detection for locally generated mail",
+	    type => 'boolean',
+	    default => 1
+	},
     };
 }
 
@@ -716,6 +721,7 @@ sub options {
 	dnsbl_threshold => { optional => 1 },
 	before_queue_filtering => { optional => 1 },
 	ndr_on_block => { optional => 1 },
+	smtputf8 => { optional => 1 },
     };
 }
 
@@ -1698,6 +1704,7 @@ my $pmg_service_params = {
     mail => {
 	hide_received => 1,
 	ndr_on_block => 1,
+	smtputf8 => 1,
     },
     admin => {
 	dkim_selector => 1,
diff --git a/src/PMG/Utils.pm b/src/PMG/Utils.pm
index 49939c4..37e76aa 100644
--- a/src/PMG/Utils.pm
+++ b/src/PMG/Utils.pm
@@ -221,27 +221,32 @@ sub subst_values_for_header {
     return $res;
 }
 
-# detects the need for setting smtputf8 based on addresses and headers
+# detects the need for setting smtputf8 based on pmg.conf, addresses and headers
 sub reinject_local_mail {
-    my ($entity, $sender, $targets, $xforward, $me, $params) = @_;
+    my ($entity, $sender, $targets, $xforward, $me) = @_;
+
+    my $cfg = PMG::Config->new();
 
-    my $needs_smtputf8 = 0;
+    my $params;
+    if ( $cfg->get('mail', 'smtputf8' )) {
+	my $needs_smtputf8 = 0;
 
-    $needs_smtputf8 = 1 if ($sender =~ /[^\p{PosixPrint}]/);
+	$needs_smtputf8 = 1 if ($sender =~ /[^\p{PosixPrint}]/);
+
+	foreach my $target (@$targets) {
+	    if ($target =~ /[^\p{PosixPrint}]/) {
+		$needs_smtputf8 = 1;
+		last;
+	    }
+	}
 
-    foreach my $target (@$targets) {
-	if ($target =~ /[^\p{PosixPrint}]/) {
+	if (!$needs_smtputf8 && $entity->head()->as_string() =~ /([^\p{PosixPrint}\n\r\t])/) {
 	    $needs_smtputf8 = 1;
-	    last;
 	}
-    }
 
-    if (!$needs_smtputf8 && $entity->head()->as_string() =~ /([^\p{PosixPrint}\n\r\t])/) {
-	$needs_smtputf8 = 1;
+	$params->{mail}->{smtputf8} = $needs_smtputf8;
     }
 
-    $params->{mail}->{smtputf8} = $needs_smtputf8;
-
     return reinject_mail($entity, $sender, $targets, $xforward, $me, $params);
 }
 
diff --git a/src/templates/main.cf.in b/src/templates/main.cf.in
index 190c913..46a5b6e 100644
--- a/src/templates/main.cf.in
+++ b/src/templates/main.cf.in
@@ -131,6 +131,10 @@ lmtp_tls_session_cache_database = btree:/var/lib/postfix/lmtp_tls_session_cache
 unverified_recipient_reject_reason = Recipient address lookup failed
 [% END %]
 
+[% IF ! pmg.mail.smtputf8 %]
+smtputf8_enable = no
+[% END %]
+
 
 default_destination_concurrency_limit = 40
 lmtp_destination_concurrency_limit = 20
-- 
2.30.2