use Nullable type for form.expires_in

internal/api/client/filters/v1/validate.go

@@ -46,12 +46,11 @@ func validateNormalizeCreateUpdateFilter(form *apimodel.FilterCreateUpdateReques
 		return errors.New("irreversible aka server-side drop filters are not supported yet")
 	}
 
-	// Normalize filter expiry if necessary.
-	if form.ExpiresInI != nil {
-		// If we parsed this as JSON, expires_in
-		// may be either a float64 or a string.
+	// If `expires_in` was provided
+	// as JSON, then normalize it.
+	if form.ExpiresInI.IsSpecified() {
 		var err error
-		form.ExpiresIn, err = apiutil.ParseDuration(
+		form.ExpiresIn, err = apiutil.ParseNullableDuration(
 			form.ExpiresInI,
 			"expires_in",
 		)
@@ -60,10 +59,5 @@ func validateNormalizeCreateUpdateFilter(form *apimodel.FilterCreateUpdateReques
 		}
 	}
 
-	// Interpret zero as indefinite duration.
-	if form.ExpiresIn != nil && *form.ExpiresIn == 0 {
-		form.ExpiresIn = nil
-	}
-
 	return nil
 }

internal/api/client/filters/v2/filterpost.go

@@ -225,12 +225,11 @@ func validateNormalizeCreateFilter(form *apimodel.FilterCreateRequestV2) error {
 	// Apply defaults for missing fields.
 	form.FilterAction = util.Ptr(action)
 
-	// Normalize filter expiry if necessary.
-	if form.ExpiresInI != nil {
-		// If we parsed this as JSON, expires_in
-		// may be either a float64 or a string.
+	// If `expires_in` was provided
+	// as JSON, then normalize it.
+	if form.ExpiresInI.IsSpecified() {
 		var err error
-		form.ExpiresIn, err = apiutil.ParseDuration(
+		form.ExpiresIn, err = apiutil.ParseNullableDuration(
 			form.ExpiresInI,
 			"expires_in",
 		)
@@ -239,11 +238,6 @@ func validateNormalizeCreateFilter(form *apimodel.FilterCreateRequestV2) error {
 		}
 	}
 
-	// Interpret zero as indefinite duration.
-	if form.ExpiresIn != nil && *form.ExpiresIn == 0 {
-		form.ExpiresIn = nil
-	}
-
 	// Normalize and validate new keywords and statuses.
 	for i, formKeyword := range form.Keywords {
 		if err := validate.FilterKeyword(formKeyword.Keyword); err != nil {

internal/api/client/filters/v2/filterput.go

@@ -18,10 +18,7 @@
 package v2
 
 import (
-	"bytes"
-	"encoding/json"
 	"errors"
-	"io"
 	"net/http"
 
 	"github.com/gin-gonic/gin"
@@ -183,43 +180,12 @@ func (m *Module) FilterPUTHandler(c *gin.Context) {
 		return
 	}
 
-	// If the request is JSON:
-	// Explicitly check whether `expires_in` is a null literal (vs. not being set at all).
-	hasNullExpiresIn := false
-	if c.ContentType() == gin.MIMEJSON {
-		// To do this, we need to read the request body twice, once here and once below for the form, so we buffer it.
-		// If a filter update request is bigger than a megabyte, somebody's messing with us.
-		bodyBytes, err := io.ReadAll(io.LimitReader(c.Request.Body, 1024*1024))
-		if err != nil {
-			apiutil.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGetV1)
-			return
-		}
-		c.Request.Body = io.NopCloser(bytes.NewReader(bodyBytes))
-
-		// Partially parse the body as a JSON object.
-		requestJSONObject := map[string]json.RawMessage{}
-		if err := json.Unmarshal(bodyBytes, &requestJSONObject); err != nil {
-			apiutil.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGetV1)
-			return
-		}
-
-		// Try to parse the `expires_in` field as a literal null.
-		if raw, found := requestJSONObject["expires_in"]; found {
-			hasNullExpiresIn = string(raw) == "null"
-		}
-	}
-
 	form := &apimodel.FilterUpdateRequestV2{}
 	if err := c.ShouldBind(form); err != nil {
 		apiutil.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGetV1)
 		return
 	}
 
-	// Interpret a literal null `expires_in` as unsetting the expiration date.
-	if hasNullExpiresIn {
-		form.ExpiresIn = util.Ptr(0)
-	}
-
 	if err := validateNormalizeUpdateFilter(form); err != nil {
 		apiutil.ErrorHandler(c, gtserror.NewErrorUnprocessableEntity(err, err.Error()), m.processor.InstanceGetV1)
 		return
@@ -303,12 +269,11 @@ func validateNormalizeUpdateFilter(form *apimodel.FilterUpdateRequestV2) error {
 		}
 	}
 
-	// Normalize filter expiry if necessary.
-	if form.ExpiresInI != nil {
-		// If we parsed this as JSON, expires_in
-		// may be either a float64 or a string.
+	// If `expires_in` was provided
+	// as JSON, then normalize it.
+	if form.ExpiresInI.IsSpecified() {
 		var err error
-		form.ExpiresIn, err = apiutil.ParseDuration(
+		form.ExpiresIn, err = apiutil.ParseNullableDuration(
 			form.ExpiresInI,
 			"expires_in",
 		)

internal/api/model/filterv1.go

@@ -95,5 +95,5 @@ type FilterCreateUpdateRequestV1 struct {
 	// Number of seconds from now that the filter should expire. If omitted, filter never expires.
 	//
 	// Example: 86400
-	ExpiresInI interface{} `json:"expires_in"`
+	ExpiresInI Nullable[any] `json:"expires_in"`
 }

internal/api/model/filterv2.go

@@ -134,7 +134,7 @@ type FilterCreateRequestV2 struct {
 	// Number of seconds from now that the filter should expire. If omitted, filter never expires.
 	//
 	// Example: 86400
-	ExpiresInI interface{} `json:"expires_in"`
+	ExpiresInI Nullable[any] `json:"expires_in"`
 
 	// Keywords to be added to the newly created filter.
 	Keywords []FilterKeywordCreateUpdateRequest `form:"-" json:"keywords_attributes" xml:"keywords_attributes"`
@@ -199,7 +199,7 @@ type FilterUpdateRequestV2 struct {
 	// Number of seconds from now that the filter should expire. If omitted, filter never expires.
 	//
 	// Example: 86400
-	ExpiresInI interface{} `json:"expires_in"`
+	ExpiresInI Nullable[any] `json:"expires_in"`
 
 	// Keywords to be added to the filter, modified, or removed.
 	Keywords []FilterKeywordCreateUpdateDeleteRequest `form:"-" json:"keywords_attributes" xml:"keywords_attributes"`

internal/api/model/nullable.go

@@ -0,0 +1,107 @@
+// 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                      = 1
+	nullableStateSet                       = 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,
+	}
+}

internal/api/util/parseform.go

@@ -20,12 +20,13 @@ package util
 import (
 	"fmt"
 	"strconv"
+
+	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/internal/util"
 )
 
-// ParseDuration parses the given raw interface belonging to
+// ParseDuration parses the given raw interface belonging
 // the given fieldName as an integer duration.
-//
-// Will return nil, nil if rawI is the zero value of its type.
 func ParseDuration(rawI any, fieldName string) (*int, error) {
 	var (
 		asInteger int
@@ -60,11 +61,28 @@ func ParseDuration(rawI any, fieldName string) (*int, error) {
 		return nil, err
 	}
 
-	// Someone submitted 0,
-	// don't point to this.
-	if asInteger == 0 {
-		return nil, nil
-	}
-
 	return &asInteger, nil
 }
+
+// ParseNullableDuration is like ParseDuration, but
+// for JSON values that may have been sent as `null`.
+//
+// IsSpecified should be checked and "true" on the
+// given nullable before calling this function.
+func ParseNullableDuration(
+	nullable apimodel.Nullable[any],
+	fieldName string,
+) (*int, error) {
+	if nullable.IsNull() {
+		// Was specified as `null`,
+		// return pointer to zero value.
+		return util.Ptr(0), nil
+	}
+
+	rawI, err := nullable.Get()
+	if err != nil {
+		return nil, err
+	}
+
+	return ParseDuration(rawI, fieldName)
+}

internal/processing/filters/v1/create.go

@@ -43,7 +43,7 @@ func (p *Processor) Create(ctx context.Context, account *gtsmodel.Account, form
 	if *form.Irreversible {
 		filter.Action = gtsmodel.FilterActionHide
 	}
-	if form.ExpiresIn != nil {
+	if form.ExpiresIn != nil && *form.ExpiresIn != 0 {
 		filter.ExpiresAt = time.Now().Add(time.Second * time.Duration(*form.ExpiresIn))
 	}
 	for _, context := range form.Context {

internal/processing/filters/v1/update.go

@@ -67,7 +67,7 @@ func (p *Processor) Update(
 		action = gtsmodel.FilterActionHide
 	}
 	expiresAt := time.Time{}
-	if form.ExpiresIn != nil {
+	if form.ExpiresIn != nil && *form.ExpiresIn != 0 {
 		expiresAt = time.Now().Add(time.Second * time.Duration(*form.ExpiresIn))
 	}
 	contextHome := false

internal/processing/filters/v2/create.go

@@ -41,7 +41,7 @@ func (p *Processor) Create(ctx context.Context, account *gtsmodel.Account, form
 		Title:     form.Title,
 		Action:    typeutils.APIFilterActionToFilterAction(*form.FilterAction),
 	}
-	if form.ExpiresIn != nil {
+	if form.ExpiresIn != nil && *form.ExpiresIn != 0 {
 		filter.ExpiresAt = time.Now().Add(time.Second * time.Duration(*form.ExpiresIn))
 	}
 	for _, context := range form.Context {