added IMAP, LetsEncrypt, update layout

internal/mailstore/rules.go

@@ -0,0 +1,54 @@
+package mailstore
+
+import "strings"
+
+// FilterAction is the outcome of evaluating a mailbox's filter rules against one
+// incoming message.
+type FilterAction struct {
+	Folder   string // non-empty: store here instead of INBOX
+	MarkRead bool
+	Drop     bool // don't store at all
+}
+
+// ApplyRules evaluates a mailbox's filter rules in priority order and returns the
+// first match's action (zero value if none match, meaning "store in INBOX, unread").
+// headers should have "from"/"to"/"subject" keys — rules run at delivery time, before
+// the message is encrypted and stored, so real header values are available, not just
+// the plaintext cache columns used for fast IMAP listing.
+func (s *Store) ApplyRules(mailboxID int64, headers map[string]string) (FilterAction, error) {
+	rules, err := s.DB.ListRulesForMailbox(mailboxID)
+	if err != nil {
+		return FilterAction{}, err
+	}
+	for _, r := range rules {
+		if !r.IsActive {
+			continue
+		}
+		if !matchCondition(r.ConditionOp, headers[r.ConditionField], r.ConditionValue) {
+			continue
+		}
+		switch r.Action {
+		case "move_to_folder":
+			return FilterAction{Folder: r.ActionValue}, nil
+		case "delete":
+			return FilterAction{Drop: true}, nil
+		case "mark_read":
+			return FilterAction{MarkRead: true}, nil
+		}
+	}
+	return FilterAction{}, nil
+}
+
+func matchCondition(op, value, target string) bool {
+	value = strings.ToLower(value)
+	target = strings.ToLower(target)
+	switch op {
+	case "contains":
+		return strings.Contains(value, target)
+	case "equals":
+		return value == target
+	case "starts_with":
+		return strings.HasPrefix(value, target)
+	}
+	return false
+}