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// 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 ap
import (
"context"
"encoding/json"
"errors"
"fmt"
"net/http"
"sync"
"github.com/superseriousbusiness/activity/pub"
"github.com/superseriousbusiness/activity/streams"
"github.com/superseriousbusiness/gotosocial/internal/gtserror"
)
// mapPool is a memory pool of maps for JSON decoding.
var mapPool = sync.Pool{
New: func() any {
return make(map[string]any)
},
}
// getMap acquires a map from memory pool.
func getMap() map[string]any {
m := mapPool.Get().(map[string]any) //nolint
return m
}
// putMap clears and places map back in pool.
func putMap(m map[string]any) {
if len(m) > int(^uint8(0)) {
// don't pool overly
// large maps.
return
}
for k := range m {
delete(m, k)
}
mapPool.Put(m)
}
// ResolveActivity is a util function for pulling a pub.Activity type out of an incoming request body.
func ResolveIncomingActivity(r *http.Request) (pub.Activity, gtserror.WithCode) {
// Get "raw" map
// destination.
raw := getMap()
// Tidy up when done.
defer r.Body.Close()
// Decode the JSON body stream into "raw" map.
if err := json.NewDecoder(r.Body).Decode(&raw); err != nil {
err := gtserror.Newf("error decoding json: %w", err)
return nil, gtserror.NewErrorInternalError(err)
}
// Resolve "raw" JSON to vocab.Type.
t, err := streams.ToType(r.Context(), raw)
if err != nil {
if !streams.IsUnmatchedErr(err) {
err := gtserror.Newf("error matching json to type: %w", err)
return nil, gtserror.NewErrorInternalError(err)
}
// Respond with bad request; we just couldn't
// match the type to one that we know about.
const text = "body json not resolvable as ActivityStreams type"
return nil, gtserror.NewErrorBadRequest(errors.New(text), text)
}
// Ensure this is an Activity type.
activity, ok := t.(pub.Activity)
if !ok {
text := fmt.Sprintf("cannot resolve vocab type %T as pub.Activity", t)
return nil, gtserror.NewErrorBadRequest(errors.New(text), text)
}
if activity.GetJSONLDId() == nil {
const text = "missing ActivityStreams id property"
return nil, gtserror.NewErrorBadRequest(errors.New(text), text)
}
// Normalize any Statusable, Accountable, Pollable fields found.
// (see: https://github.com/superseriousbusiness/gotosocial/issues/1661)
NormalizeIncomingActivity(activity, raw)
// Release.
putMap(raw)
return activity, nil
}
// ResolveStatusable tries to resolve the given bytes into an ActivityPub Statusable representation.
// It will then perform normalization on the Statusable.
//
// Works for: Article, Document, Image, Video, Note, Page, Event, Place, Profile, Question.
func ResolveStatusable(ctx context.Context, b []byte) (Statusable, error) {
// Get "raw" map
// destination.
raw := getMap()
// Unmarshal the raw JSON data in a "raw" JSON map.
if err := json.Unmarshal(b, &raw); err != nil {
return nil, gtserror.Newf("error unmarshalling bytes into json: %w", err)
}
// Resolve an ActivityStreams type from JSON.
t, err := streams.ToType(ctx, raw)
if err != nil {
return nil, gtserror.Newf("error resolving json into ap vocab type: %w", err)
}
// Attempt to cast as Statusable.
statusable, ok := ToStatusable(t)
if !ok {
err := gtserror.Newf("cannot resolve vocab type %T as statusable", t)
return nil, gtserror.SetWrongType(err)
}
if pollable, ok := ToPollable(statusable); ok {
// Question requires extra normalization, and
// fortunately directly implements Statusable.
NormalizeIncomingPollOptions(pollable, raw)
statusable = pollable
}
NormalizeIncomingContent(statusable, raw)
NormalizeIncomingAttachments(statusable, raw)
NormalizeIncomingSummary(statusable, raw)
NormalizeIncomingName(statusable, raw)
// Release.
putMap(raw)
return statusable, nil
}
// ResolveStatusable tries to resolve the given bytes into an ActivityPub Accountable representation.
// It will then perform normalization on the Accountable.
//
// Works for: Application, Group, Organization, Person, Service
func ResolveAccountable(ctx context.Context, b []byte) (Accountable, error) {
// Get "raw" map
// destination.
raw := getMap()
// Unmarshal the raw JSON data in a "raw" JSON map.
if err := json.Unmarshal(b, &raw); err != nil {
return nil, gtserror.Newf("error unmarshalling bytes into json: %w", err)
}
// Resolve an ActivityStreams type from JSON.
t, err := streams.ToType(ctx, raw)
if err != nil {
return nil, gtserror.Newf("error resolving json into ap vocab type: %w", err)
}
// Attempt to cast as Statusable.
accountable, ok := ToAccountable(t)
if !ok {
err := gtserror.Newf("cannot resolve vocab type %T as accountable", t)
return nil, gtserror.SetWrongType(err)
}
NormalizeIncomingSummary(accountable, raw)
// Release.
putMap(raw)
return accountable, nil
}
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