From 78da72c29f56641b06e57fa72d9828325775832b Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Sun, 10 Feb 2019 20:50:03 +0100
Subject: ...

---
 ymir.nix | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/ymir.nix b/ymir.nix
index 2d5be241..96a3cd30 100644
--- a/ymir.nix
+++ b/ymir.nix
@@ -1111,6 +1111,61 @@ in rec {
       '';
       "dkim_signing.conf".text = "enabled = false;";
       "neural.conf".text = "enabled = false;";
+      "classifier-bayes.conf".text = ''
+        enable = true;
+        expire = 8640000;
+        new_schema = true;
+        backend = "redis";
+        autolearn = true;
+
+        per_user = <<EOD
+        return function(task)
+            local rcpt = task:get_recipients(1)
+
+        if rcpt then
+            one_rcpt = rcpt[1]
+            if one_rcpt['domain'] then
+                return one_rcpt['domain']
+            end
+        end
+
+        return nil
+        end
+        EOD
+        
+        statfile {
+            symbol = "BAYES_HAM";
+            spam = false;
+        }
+        statfile {
+            symbol = "BAYES_SPAM";
+            spam = true;
+        }
+        learn_condition =<<EOD
+        return function(task, is_spam, is_unlearn)
+            local prob = task:get_mempool():get_variable('bayes_prob', 'double')
+
+            if prob then
+                local in_class = false
+                local cl
+                if is_spam then
+                    cl = 'spam'
+                    in_class = prob >= 0.95
+                else
+                    cl = 'ham'
+                    in_class = prob <= 0.05
+                end
+
+                if in_class then
+                    return false,string.format('already in class %s; probability %.2f%%',
+                    cl, math.abs((prob - 0.5) * 200.0))
+                end
+            end
+
+            return true
+        end
+        EOD
+      '';
     };
   };
 
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