core: Check for nil event origin (#7047)

* fix: crash - null check on event origin

* chore: use accessor instead of property

caddy.go

@@ -1104,9 +1104,15 @@ func (e Event) Origin() Module       { return e.origin } // Returns the module t
 // CloudEvents spec.
 func (e Event) CloudEvent() CloudEvent {
 	dataJSON, _ := json.Marshal(e.Data)
+	var source string
+	if e.Origin() == nil {
+		source = "caddy"
+	} else {
+		source = string(e.Origin().CaddyModule().ID)
+	}
 	return CloudEvent{
 		ID:              e.id.String(),
-		Source:          e.origin.CaddyModule().String(),
+		Source:          source,
 		SpecVersion:     "1.0",
 		Type:            e.name,
 		Time:            e.ts,

caddy_test.go

@@ -15,6 +15,7 @@
 package caddy
 
 import (
+	"context"
 	"testing"
 	"time"
 )
@@ -72,3 +73,21 @@ func TestParseDuration(t *testing.T) {
 		}
 	}
 }
+
+func TestEvent_CloudEvent_NilOrigin(t *testing.T) {
+	ctx, _ := NewContext(Context{Context: context.Background()}) // module will be nil by default
+	event, err := NewEvent(ctx, "started", nil)
+	if err != nil {
+		t.Fatalf("NewEvent() error = %v", err)
+	}
+
+	// This should not panic
+	ce := event.CloudEvent()
+
+	if ce.Source != "caddy" {
+		t.Errorf("Expected CloudEvent Source to be 'caddy', got '%s'", ce.Source)
+	}
+	if ce.Type != "started" {
+		t.Errorf("Expected CloudEvent Type to be 'started', got '%s'", ce.Type)
+	}
+}