Avoid webpage preview updates being sent as message edits (by hash matching)

1 files changed, 7 insertions, 0 deletions

diff --git a/telegram/client.go b/telegram/client.go
index 61d46aa..5b0217a 100644
--- a/telegram/client.go
+++ b/telegram/client.go
@@ -2,6 +2,7 @@ package telegram
 
 import (
 	"github.com/pkg/errors"
+	"hash/maphash"
 	"path/filepath"
 	"strconv"
 	"sync"
@@ -60,6 +61,9 @@ type Client struct {
 	DelayedStatuses     map[int64]*DelayedStatus
 	DelayedStatusesLock sync.Mutex
 
+	lastMsgHashes map[int64]uint64
+	msgHashSeed   maphash.Seed
+
 	locks           clientLocks
 	SendMessageLock sync.Mutex
 }
@@ -69,6 +73,7 @@ type clientLocks struct {
 	chatMessageLocks   map[int64]*sync.Mutex
 	resourcesLock      sync.Mutex
 	outboxLock         sync.Mutex
+	lastMsgHashesLock  sync.Mutex
 }
 
 // NewClient instantiates a Telegram App
@@ -129,6 +134,8 @@ func NewClient(conf config.TelegramConfig, jid string, component *xmpp.Component
 		cache:           cache.NewCache(),
 		options:         options,
 		DelayedStatuses: make(map[int64]*DelayedStatus),
+		lastMsgHashes:   make(map[int64]uint64),
+		msgHashSeed:     maphash.MakeSeed(),
 		locks: clientLocks{
 			chatMessageLocks: make(map[int64]*sync.Mutex),
 		},