feat(imapx): message dedup key (Message-ID + header fallback)

2026-07-01 17:03:18 +07:00
parent 67a2367baa
commit 37cb8ba076
4 changed files with 75 additions and 1 deletions
@@ -0,0 +1,32 @@
+package imapx
+
+import (
+	"testing"
+	"time"
+
+	"github.com/emersion/go-imap/v2"
+)
+
+func TestMessageKeyPrefersMessageID(t *testing.T) {
+	env := &imap.Envelope{MessageID: "<abc@host>"}
+	if got := MessageKey(env, 100); got != "<abc@host>" {
+		t.Fatalf("got %q, want <abc@host>", got)
+	}
+}
+
+func TestMessageKeyFallbackStable(t *testing.T) {
+	env := &imap.Envelope{
+		Subject: "Hi",
+		Date:    time.Unix(1700000000, 0).UTC(),
+		From:    []imap.Address{{Mailbox: "a", Host: "x.com"}},
+		To:      []imap.Address{{Mailbox: "b", Host: "y.com"}},
+	}
+	k1 := MessageKey(env, 42)
+	k2 := MessageKey(env, 42)
+	if k1 != k2 {
+		t.Fatal("fallback key must be deterministic")
+	}
+	if MessageKey(env, 43) == k1 {
+		t.Fatal("different size must change key")
+	}
+}