Drop messages with text longer than 4096 characters (#2029)

VERSION

@@ -1 +1 @@
-0.58.0
+0.59.0

protocol/message_validator.go

@@ -2,6 +2,7 @@ package protocol
 
 import (
 	"errors"
+	"fmt"
 	"strconv"
 	"strings"
 
@@ -9,6 +10,8 @@ import (
 	"github.com/status-im/status-go/protocol/v1"
 )
 
+const maxChatMessageTextLength = 4096
+
 // maxWhisperDrift is how many milliseconds we allow the clock value to differ
 // from whisperTimestamp
 const maxWhisperFutureDriftMs uint64 = 120000
@@ -163,6 +166,10 @@ func ValidateReceivedChatMessage(message *protobuf.ChatMessage, whisperTimestamp
 		return errors.New("text can't be empty")
 	}
 
+	if len(message.Text) > maxChatMessageTextLength {
+		return fmt.Errorf("text shouldn't be longer than %d", maxChatMessageTextLength)
+	}
+
 	if len(message.ChatId) == 0 {
 		return errors.New("chatId can't be empty")
 	}

protocol/message_validator_test.go

@@ -1,6 +1,7 @@
 package protocol
 
 import (
+	"fmt"
 	"testing"
 
 	"github.com/stretchr/testify/suite"
@@ -193,6 +194,21 @@ func (s *MessageValidatorSuite) TestValidatePlainTextMessage() {
 				ContentType: protobuf.ChatMessage_TEXT_PLAIN,
 			},
 		},
+		{
+			Name:             "Too long text",
+			WhisperTimestamp: 2,
+			Valid:            false,
+			Message: protobuf.ChatMessage{
+				ChatId:      "a",
+				Clock:       1,
+				Timestamp:   2,
+				Text:        fmt.Sprintf("%x", make([]byte, maxChatMessageTextLength/2+1)),
+				ResponseTo:  "",
+				EnsName:     "",
+				MessageType: protobuf.MessageType_ONE_TO_ONE,
+				ContentType: protobuf.ChatMessage_TEXT_PLAIN,
+			},
+		},
 		{
 			Name:             "Unknown MessageType",
 			WhisperTimestamp: 2,