api: Add go files

I know this is a huge commit, but I can't be bothered to check
this in part by part.

api/commenter_new_test.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"testing"
+)
+
+func TestCommenterNewBasics(t *testing.T) {
+	failTestOnError(t, setupTestEnv())
+
+	if _, err := commenterNew("test@example.com", "Test", "undefined", "https://example.com/photo.jpg", "google"); err != nil {
+		t.Errorf("unexpected error creating new commenter: %v", err)
+		return
+	}
+}
+
+func TestCommenterNewEmpty(t *testing.T) {
+	failTestOnError(t, setupTestEnv())
+
+	if _, err := commenterNew("", "Test", "undefined", "https://example.com/photo.jpg", "google"); err == nil {
+		t.Errorf("expected error not found creating new commenter with empty email")
+		return
+	}
+
+	if _, err := commenterNew("", "", "", "", ""); err == nil {
+		t.Errorf("expected error not found creating new commenter with empty everything")
+		return
+	}
+}