From d1d129f6cffb909516a29f9bdb0da6f13e65dcaf Mon Sep 17 00:00:00 2001
From: Tulir Asokan <tulir@maunium.net>
Date: Sun, 16 Jun 2019 20:42:13 +0300
Subject: Add support for redactions. Fixes #19

---
 matrix/history.go | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

(limited to 'matrix/history.go')

diff --git a/matrix/history.go b/matrix/history.go
index 7275c15..af81ed2 100644
--- a/matrix/history.go
+++ b/matrix/history.go
@@ -21,6 +21,7 @@ import (
 	"compress/gzip"
 	"encoding/binary"
 	"encoding/gob"
+	"errors"
 
 	sync "github.com/sasha-s/go-deadlock"
 	bolt "go.etcd.io/bbolt"
@@ -107,6 +108,37 @@ func (hm *HistoryManager) Get(room *rooms.Room, eventID string) (event *mautrix.
 	return
 }
 
+var EventNotFoundError = errors.New("event not found")
+
+func (hm *HistoryManager) Update(room *rooms.Room, eventID string, update func(event *mautrix.Event) error) error {
+	return hm.db.Update(func (tx *bolt.Tx) error {
+		rid := []byte(room.ID)
+		eventIDs := tx.Bucket(bucketRoomEventIDs).Bucket(rid)
+		if eventIDs == nil {
+			return nil
+		}
+		streamIndex := eventIDs.Get([]byte(eventID))
+		if streamIndex == nil {
+			return nil
+		}
+		stream := tx.Bucket(bucketRoomStreams).Bucket(rid)
+		eventData := stream.Get(streamIndex)
+		if eventData == nil {
+			return EventNotFoundError
+		}
+
+		if event, err := unmarshalEvent(eventData); err != nil {
+			return err
+		} else if err = update(event); err != nil {
+			return err
+		} else if eventData, err = marshalEvent(event); err != nil {
+			return err
+		} else {
+			return stream.Put(streamIndex, eventData)
+		}
+	})
+}
+
 func (hm *HistoryManager) Append(room *rooms.Room, events []*mautrix.Event) error {
 	return hm.store(room, events, true)
 }
-- 
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