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/domain_ownership_verify_test.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"testing"
+)
+
+func TestDomainVerifyOwnershipBasics(t *testing.T) {
+	failTestOnError(t, setupTestEnv())
+
+	ownerHex, _ := ownerNew("test@example.com", "Test", "hunter2")
+	ownerLogin("test@example.com", "hunter2")
+
+	domainNew(ownerHex, "Example", "example.com")
+
+	isOwner, err := domainOwnershipVerify(ownerHex, "example.com")
+	if err != nil {
+		t.Errorf("error checking ownership: %v", err)
+		return
+	}
+
+	if !isOwner {
+		t.Errorf("expected isOwner=true got isOwner=false")
+		return
+	}
+
+	otherOwnerHex, _ := ownerNew("test2@example.com", "Test2", "hunter2")
+	ownerLogin("test2@example.com", "hunter2")
+
+	isOwner, err = domainOwnershipVerify(otherOwnerHex, "example.com")
+	if err != nil {
+		t.Errorf("error checking ownership: %v", err)
+		return
+	}
+
+	if isOwner {
+		t.Errorf("expected isOwner=false got isOwner=true")
+		return
+	}
+}