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/owner_get_test.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"testing"
+)
+
+func TestOwnerGetByEmailBasics(t *testing.T) {
+	failTestOnError(t, setupTestEnv())
+
+	ownerHex, _ := ownerNew("test@example.com", "Test", "hunter2")
+
+	o, err := ownerGetByEmail("test@example.com")
+	if err != nil {
+		t.Errorf("unexpected error on ownerGetByEmail: %v", err)
+		return
+	}
+
+	if o.OwnerHex != ownerHex {
+		t.Errorf("expected ownerHex=%s got ownerHex=%s", ownerHex, o.OwnerHex)
+		return
+	}
+}
+
+func TestOwnerGetByEmailDNE(t *testing.T) {
+	failTestOnError(t, setupTestEnv())
+
+	if _, err := ownerGetByEmail("invalid@example.com"); err == nil {
+		t.Errorf("expected error not found on ownerGetByEmail before creating an account")
+		return
+	}
+}
+
+func TestOwnerGetBySessionBasics(t *testing.T) {
+	failTestOnError(t, setupTestEnv())
+
+	ownerHex, _ := ownerNew("test@example.com", "Test", "hunter2")
+
+	session, _ := ownerLogin("test@example.com", "hunter2")
+
+	o, err := ownerGetBySession(session)
+	if err != nil {
+		t.Errorf("unexpected error on ownerGetBySession: %v", err)
+		return
+	}
+
+	if o.OwnerHex != ownerHex {
+		t.Errorf("expected ownerHex=%s got ownerHex=%s", ownerHex, o.OwnerHex)
+		return
+	}
+}
+
+func TestOwnerGetBySessionDNE(t *testing.T) {
+	failTestOnError(t, setupTestEnv())
+
+	if _, err := ownerGetBySession("does-not-exist"); err == nil {
+		t.Errorf("expected error not found on ownerGetBySession before creating an account")
+		return
+	}
+}