1 files changed, 126 insertions, 0 deletions
diff --git a/internal/processing/conversations/conversations.go b/internal/processing/conversations/conversations.go
new file mode 100644
index 000000000..d95740605
--- /dev/null
+++ b/internal/processing/conversations/conversations.go
@@ -0,0 +1,126 @@
+// 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 conversations
+
+import (
+	"context"
+	"errors"
+
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/filter/usermute"
+	"github.com/superseriousbusiness/gotosocial/internal/filter/visibility"
+	"github.com/superseriousbusiness/gotosocial/internal/gtscontext"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/state"
+	"github.com/superseriousbusiness/gotosocial/internal/typeutils"
+)
+
+type Processor struct {
+	state     *state.State
+	converter *typeutils.Converter
+	filter    *visibility.Filter
+}
+
+func New(
+	state *state.State,
+	converter *typeutils.Converter,
+	filter *visibility.Filter,
+) Processor {
+	return Processor{
+		state:     state,
+		converter: converter,
+		filter:    filter,
+	}
+}
+
+const conversationNotFoundHelpText = "conversation not found"
+
+// getConversationOwnedBy gets a conversation by ID and checks that it is owned by the given account.
+func (p *Processor) getConversationOwnedBy(
+	ctx context.Context,
+	id string,
+	requestingAccount *gtsmodel.Account,
+) (*gtsmodel.Conversation, gtserror.WithCode) {
+	// Get the conversation so that we can check its owning account ID.
+	conversation, err := p.state.DB.GetConversationByID(ctx, id)
+	if err != nil && !errors.Is(err, db.ErrNoEntries) {
+		return nil, gtserror.NewErrorInternalError(
+			gtserror.Newf(
+				"DB error getting conversation %s for account %s: %w",
+				id,
+				requestingAccount.ID,
+				err,
+			),
+		)
+	}
+	if conversation == nil {
+		return nil, gtserror.NewErrorNotFound(
+			gtserror.Newf(
+				"conversation %s not found: %w",
+				id,
+				err,
+			),
+			conversationNotFoundHelpText,
+		)
+	}
+	if conversation.AccountID != requestingAccount.ID {
+		return nil, gtserror.NewErrorNotFound(
+			gtserror.Newf(
+				"conversation %s not owned by account %s: %w",
+				id,
+				requestingAccount.ID,
+				err,
+			),
+			conversationNotFoundHelpText,
+		)
+	}
+
+	return conversation, nil
+}
+
+// getFiltersAndMutes gets the given account's filters and compiled mute list.
+func (p *Processor) getFiltersAndMutes(
+	ctx context.Context,
+	requestingAccount *gtsmodel.Account,
+) ([]*gtsmodel.Filter, *usermute.CompiledUserMuteList, gtserror.WithCode) {
+	filters, err := p.state.DB.GetFiltersForAccountID(ctx, requestingAccount.ID)
+	if err != nil {
+		return nil, nil, gtserror.NewErrorInternalError(
+			gtserror.Newf(
+				"DB error getting filters for account %s: %w",
+				requestingAccount.ID,
+				err,
+			),
+		)
+	}
+
+	mutes, err := p.state.DB.GetAccountMutes(gtscontext.SetBarebones(ctx), requestingAccount.ID, nil)
+	if err != nil {
+		return nil, nil, gtserror.NewErrorInternalError(
+			gtserror.Newf(
+				"DB error getting mutes for account %s: %w",
+				requestingAccount.ID,
+				err,
+			),
+		)
+	}
+	compiledMutes := usermute.NewCompiledUserMuteList(mutes)
+
+	return filters, compiledMutes, nil
+}