GoToSocial/internal/processing/polls/vote.go

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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 polls
import (
"context"
"errors"
"github.com/superseriousbusiness/gotosocial/internal/ap"
apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/gtserror"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/id"
"github.com/superseriousbusiness/gotosocial/internal/messages"
)
func (p *Processor) PollVote(ctx context.Context, requester *gtsmodel.Account, pollID string, choices []int) (*apimodel.Poll, gtserror.WithCode) {
// Get (+ check visibility of) requested poll with ID.
poll, errWithCode := p.getTargetPoll(ctx, requester, pollID)
if errWithCode != nil {
return nil, errWithCode
}
switch {
// Poll author isn't allowed to vote in their own poll.
case requester.ID == poll.Status.AccountID:
const text = "you can't vote in your own poll"
return nil, gtserror.NewErrorUnprocessableEntity(errors.New(text), text)
// Poll has already closed, no more voting!
case poll.Closed():
const text = "poll already closed"
return nil, gtserror.NewErrorUnprocessableEntity(errors.New(text), text)
// No choices given, or multiple given for single-choice poll.
case len(choices) == 0 || (!*poll.Multiple && len(choices) > 1):
const text = "invalid number of choices for poll"
return nil, gtserror.NewErrorBadRequest(errors.New(text), text)
}
for _, choice := range choices {
if choice < 0 || choice >= len(poll.Options) {
// This is an invalid choice (index out of range).
const text = "invalid option index for poll"
return nil, gtserror.NewErrorBadRequest(errors.New(text), text)
}
}
// Wrap the choices in a PollVote model.
vote := &gtsmodel.PollVote{
ID: id.NewULID(),
Choices: choices,
AccountID: requester.ID,
Account: requester,
PollID: pollID,
Poll: poll,
}
// Insert the new poll votes into the database.
err := p.state.DB.PutPollVote(ctx, vote)
switch {
case err == nil:
// no issue.
case errors.Is(err, db.ErrAlreadyExists):
// Users cannot vote multiple *times* (not choices).
const text = "you have already voted in poll"
return nil, gtserror.NewErrorUnprocessableEntity(err, text)
default:
// Any other irrecoverable database error.
err := gtserror.Newf("error inserting poll vote: %w", err)
return nil, gtserror.NewErrorInternalError(err)
}
// Before enqueuing it, increment the poll
// vote counts on the copy attached to the
// PollVote (that we also later return).
poll.IncrementVotes(choices)
// Enqueue worker task to handle side-effects of user poll vote(s).
p.state.Workers.EnqueueClientAPI(ctx, messages.FromClientAPI{
APActivityType: ap.ActivityCreate,
APObjectType: ap.ActivityQuestion,
GTSModel: vote, // the vote choices
OriginAccount: requester,
})
// Return converted API model poll.
return p.toAPIPoll(ctx, requester, poll)
}