[feature] add support for polls + receiving federated status edits (#2330)

internal/processing/polls/poll.go

@@ -0,0 +1,91 @@
+// 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"
+
+	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtscontext"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/processing/common"
+	"github.com/superseriousbusiness/gotosocial/internal/state"
+	"github.com/superseriousbusiness/gotosocial/internal/typeutils"
+)
+
+type Processor struct {
+	// common processor logic
+	c *common.Processor
+
+	state     *state.State
+	converter *typeutils.Converter
+}
+
+func New(common *common.Processor, state *state.State, converter *typeutils.Converter) Processor {
+	return Processor{
+		c:         common,
+		state:     state,
+		converter: converter,
+	}
+}
+
+// getTargetPoll fetches a target poll ID for requesting account, taking visibility of the poll's originating status into account.
+func (p *Processor) getTargetPoll(ctx context.Context, requestingAccount *gtsmodel.Account, targetID string) (*gtsmodel.Poll, gtserror.WithCode) {
+	// Load the requested poll with ID.
+	// (barebones as we fetch status below)
+	poll, err := p.state.DB.GetPollByID(
+		gtscontext.SetBarebones(ctx),
+		targetID,
+	)
+	if err != nil && !errors.Is(err, db.ErrNoEntries) {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	if poll == nil {
+		// No poll could be found for given ID.
+		const text = "target poll not found"
+		return nil, gtserror.NewErrorNotFound(
+			errors.New(text),
+			text,
+		)
+	}
+
+	// Check that we can see + fetch the originating status for requesting account.
+	status, errWithCode := p.c.GetVisibleTargetStatus(ctx, requestingAccount, poll.StatusID)
+	if errWithCode != nil {
+		return nil, errWithCode
+	}
+
+	// Update poll status.
+	poll.Status = status
+
+	return poll, nil
+}
+
+// toAPIPoll converrts a given Poll to frontend API model, returning an appropriate error with HTTP code on failure.
+func (p *Processor) toAPIPoll(ctx context.Context, requester *gtsmodel.Account, poll *gtsmodel.Poll) (*apimodel.Poll, gtserror.WithCode) {
+	apiPoll, err := p.converter.PollToAPIPoll(ctx, requester, poll)
+	if err != nil {
+		err := gtserror.Newf("error converting to api model: %w", err)
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+	return apiPoll, nil
+}