Script("Name") = "DiscordHook"
Script("Author") = "Pyro"
Script("Major") = 0
Script("Minor") = 2
Script("Revision") = 20180106
Script("Description") = "Sends chat events to a Discord webhook."

Public HookUrl              ' The URL of the webhook
Public ShowJoins            ' "True" if join/leave messages should be sent.
Public ChannelFilter        ' If set, only shows events from the specified channel.
Public UseDiscordNameField  ' "True" to use the discord username field for messages (unreliable)

Sub Event_Load()
    HookUrl = GetSettingsEntry("Hook")
    ShowJoins = CBool(LCase(GetSettingsEntry("ShowJoins")) = "true")
    ChannelFilter = GetSettingsEntry("Channel")
    UseDiscordNameField = CBool(LCase(GetSettingsEntry("UseDiscordNameField")) = "true")
End Sub

Sub Event_UserTalk(Username, Flags, Message, Ping)
    If Len(ChannelFilter) = 0 Or StrComp(Channel.Name, ChannelFilter, vbTextCompare) = 0 Then
        Send Username, Message
    End If
End Sub

Sub Event_MessageSent(MessageID, Message, Tag)
    If Len(ChannelFilter) = 0 Or StrComp(Channel.Name, ChannelFilter, vbTextCompare) = 0 Then
        If Left(Message, 1) <> "/" Then
            Send Channel.Self.Name, Message
        End If
    End If
End Sub

Sub Event_UserJoins(Username, Flags, Message, Ping, Product, Level, StatString, Banned)
    If ShowJoins And (Len(ChannelFilter) = 0 Or StrComp(Channel.Name, ChannelFilter, vbTextCompare) = 0) Then
        Send "", StringFormat("{0} [{1}ms] has joined the channel using {2}.", Username, Ping, Product)
    End If
End Sub

Sub Event_UserLeaves(Username, Flags)
    If ShowJoins And (Len(ChannelFilter) = 0 Or StrComp(Channel.Name, ChannelFilter, vbTextCompare) = 0) Then
        Send "", StringFormat("{0} has left the channel.", Username)
    End If
End Sub

Sub Send(user, msg)
    user = DoReplace(user)
    msg = DoReplace(msg)
    
    data = "{"
    If Len(user) > 0 Then
        If UseDiscordNameField Then
            data = data & Chr(34) & "username" & Chr(34) & ":" & Chr(34) & user & Chr(34) & ","
        Else
            msg = "<" & user & "> " & msg
        End If
    End If
    data = data & Chr(34) & "content" & Chr(34) & ":" & Chr(34) & msg & Chr(34) & "}"
    
    With CreateObject("MSXML2.XMLHTTP")
        .Open "POST", HookUrl
        .SetRequestHeader "Content-Type", "application/json"
        .Send data 
    End With
End Sub

Function DoReplace(msg)
    DoReplace = Replace(msg, "\", "\\")
    DoReplace = Replace(DoReplace, Chr(8), "\b")
    DoReplace = Replace(DoReplace, Chr(9), "\t")
    DoReplace = Replace(DoReplace, Chr(10), "\n")
    DoReplace = Replace(DoReplace, Chr(12), "\f")
    DoReplace = Replace(DoReplace, Chr(13), "\r")
    DoReplace = Replace(DoReplace, Chr(34), "\" & Chr(34))
End Function