mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-28 06:36:39 +00:00
6a8af42647
* Regression tests for #3497 (v1 and v2) * use Nullable type for v2 form.expires_in --------- Co-authored-by: tobi <tobi.smethurst@protonmail.com>
108 lines
2.8 KiB
Go
108 lines
2.8 KiB
Go
// GoToSocial
|
|
// Copyright (C) GoToSocial Authors admin@gotosocial.org
|
|
// SPDX-License-Identifier: AGPL-3.0-or-later
|
|
//
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Affero General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Affero General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Affero General Public License
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package model
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/json"
|
|
"errors"
|
|
)
|
|
|
|
// Nullable is a generic type, which implements a field that can be one of three states:
|
|
//
|
|
// - field is not set in the request
|
|
// - field is explicitly set to `null` in the request
|
|
// - field is explicitly set to a valid value in the request
|
|
//
|
|
// Nullable is intended to be used with JSON unmarshalling.
|
|
//
|
|
// Adapted from https://github.com/oapi-codegen/nullable/blob/main/nullable.go
|
|
type Nullable[T any] struct {
|
|
state nullableState
|
|
value T
|
|
}
|
|
|
|
type nullableState uint8
|
|
|
|
const (
|
|
nullableStateUnspecified nullableState = 0
|
|
nullableStateNull nullableState = 1
|
|
nullableStateSet nullableState = 2
|
|
)
|
|
|
|
// Get retrieves the underlying value, if present,
|
|
// and returns an error if the value was not present.
|
|
func (t Nullable[T]) Get() (T, error) {
|
|
var empty T
|
|
if t.IsNull() {
|
|
return empty, errors.New("value is null")
|
|
}
|
|
|
|
if !t.IsSpecified() {
|
|
return empty, errors.New("value is not specified")
|
|
}
|
|
|
|
return t.value, nil
|
|
}
|
|
|
|
// IsNull indicates whether the field
|
|
// was sent, and had a value of `null`
|
|
func (t Nullable[T]) IsNull() bool {
|
|
return t.state == nullableStateNull
|
|
}
|
|
|
|
// IsSpecified indicates whether the field
|
|
// was sent either as a value or as `null`.
|
|
func (t Nullable[T]) IsSpecified() bool {
|
|
return t.state != nullableStateUnspecified
|
|
}
|
|
|
|
// If field is unspecified,
|
|
// UnmarshalJSON won't be called.
|
|
func (t *Nullable[T]) UnmarshalJSON(data []byte) error {
|
|
// If field is specified as `null`.
|
|
if bytes.Equal(data, []byte("null")) {
|
|
t.setNull()
|
|
return nil
|
|
}
|
|
|
|
// Otherwise, we have an
|
|
// actual value, so parse it.
|
|
var v T
|
|
if err := json.Unmarshal(data, &v); err != nil {
|
|
return err
|
|
}
|
|
|
|
t.set(v)
|
|
return nil
|
|
}
|
|
|
|
// setNull indicates that the field
|
|
// was sent, and had a value of `null`
|
|
func (t *Nullable[T]) setNull() {
|
|
*t = Nullable[T]{state: nullableStateNull}
|
|
}
|
|
|
|
// set the underlying value to given value.
|
|
func (t *Nullable[T]) set(value T) {
|
|
*t = Nullable[T]{
|
|
state: nullableStateSet,
|
|
value: value,
|
|
}
|
|
}
|