Honor per-user spam settings, fixes #21

dovecot/conf/pigeonhole-sieve.dict

@@ -1,5 +1,19 @@
 connect = /data/freeposte.db
 
+map {
+  pattern = priv/spam_enabled
+  table = user
+  username_field = email
+  value_field = spam_enabled
+}
+
+map {
+  pattern = priv/spam_threshold
+  table = user
+  username_field = email
+  value_field = spam_threshold
+}
+
 map {
   pattern = priv/reply_enabled
   table = user

dovecot/sieve/after.sieve

@@ -1,6 +1,12 @@
-require ["fileinto", "envelope", "mailbox", "imap4flags"];
+require ["variables", "fileinto", "envelope", "mailbox", "imap4flags", "regex", "relational", "comparator-i;ascii-numeric", "vnd.dovecot.extdata"];
 
-if header :contains "X-Spam" "YES" {
-  setflag "\\seen";
-  fileinto :create "Junk";
+
+if string :is "${extdata.spam_enabled}" "1" {
+  if header :matches "X-Spam-Status" "* score=*" {
+    if string :value "ge" :comparator "i;ascii-numeric" "${2}" "${extdata.spam_threshold}" {
+      setflag "\\seen";
+      fileinto :create "Junk";
+      stop;
+    }
+  }
 }