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deprecate message truncation

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Implements #1577, but the issue should remain open until we clean up
the debugging loglines.
This commit is contained in:
Shivaram Lingamneni 2021-03-04 22:29:34 -05:00
parent 6fae02d335
commit 03185ea4a9
12 changed files with 148 additions and 29 deletions
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48
irc/handlers.go
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@ -1981,6 +1981,43 @@ func nickHandler(server *Server, client *Client, msg ircmsg.IRCMessage, rb *Resp
return false
}
// check whether a PRIVMSG or NOTICE is too long to be relayed without truncation
func validateLineLen(msgType history.ItemType, source, target, payload string) (ok bool) {
// :source PRIVMSG #target :payload\r\n
// 1: initial colon on prefix
// 1: space between prefix and command
// 1: space between command and target (first parameter)
// 1: space between target and payload (second parameter)
// 1: colon to send the payload as a trailing (we force trailing for PRIVMSG and NOTICE)
// 2: final \r\n
limit := MaxLineLen - 7
limit -= len(source)
switch msgType {
case history.Privmsg:
limit -= 7
case history.Notice:
limit -= 6
default:
return true
}
limit -= len(payload)
return limit >= 0
}
// check validateLineLen for an entire SplitMessage (which may consist of multiple lines)
func validateSplitMessageLen(msgType history.ItemType, source, target string, message utils.SplitMessage) (ok bool) {
if message.Is512() {
return validateLineLen(msgType, source, target, message.Message)
} else {
for _, messagePair := range message.Split {
if !validateLineLen(msgType, source, target, messagePair.Message) {
return false
}
}
return true
}
}
// helper to store a batched PRIVMSG in the session object
func absorbBatchedMessage(server *Server, client *Client, msg ircmsg.IRCMessage, batchTag string, histType history.ItemType, rb *ResponseBuffer) {
var errorCode, errorMessage string
@ -2033,7 +2070,6 @@ func messageHandler(server *Server, client *Client, msg ircmsg.IRCMessage, rb *R
return false
}
cnick := client.Nick()
clientOnlyTags := msg.ClientOnlyTags()
if histType == history.Tagmsg && len(clientOnlyTags) == 0 {
// nothing to do
@ -2046,7 +2082,7 @@ func messageHandler(server *Server, client *Client, msg ircmsg.IRCMessage, rb *R
message = msg.Params[1]
}
if histType != history.Tagmsg && message == "" {
rb.Add(nil, server.name, ERR_NOTEXTTOSEND, cnick, client.t("No text to send"))
rb.Add(nil, server.name, ERR_NOTEXTTOSEND, client.Nick(), client.t("No text to send"))
return false
}
@ -2147,6 +2183,14 @@ func dispatchMessageToTarget(client *Client, tags map[string]string, histType hi
rb.Add(nil, server.name, ERR_NEEDREGGEDNICK, client.Nick(), tnick, client.t("You must be registered to send a direct message to this user"))
return
}
if !client.server.Config().Server.Compatibility.allowTruncation {
if !validateSplitMessageLen(histType, client.NickMaskString(), tnick, message) {
rb.Add(nil, server.name, ERR_INPUTTOOLONG, client.Nick(), client.t("Line too long to be relayed without truncation"))
// TODO(#1577) remove this logline:
client.server.logger.Debug("internal", "rejected truncation-requiring channel message from client", details.nick)
return
}
}
nickMaskString := details.nickMask
accountName := details.accountName
var deliverySessions []*Session