Let Me Click And Send for Server

A simple Minecraft server-side mod, that replaces all non-command run_command content with a custom command,
to bypass client-side restrictions since 1.19.1-rc1

If you want a more direct solution, here's a client-side only mod that does the same thing:
LetMeClickAndSend

Example

Let's run the following command, and then click the shown text

# Minecraft [1.7, 1.21.5)
/tellraw @a {"text":"click me to send \"hi\"","clickEvent":{"action":"run_command","value":"hi"}}

In vanilla 1.19.1 ~ 1.21.4, after clicking, you are not able to say anything since hi is not a valid command (not starts with /)

With this mod, the server will automatically replace the value field in the click event above with /lmcas hi,
so the client can "send" the message without any issue after the click

On command received, the server will broadcast a message with the same format as a player message, simulating the player saying "hi" in chat

MC 1.21.5+

Since MC 1.21.5, the run_command behavior has changed a lot

First is the change in command syntax, which has little impact:

# Minecraft [1.21.5, ~)
/tellraw @a {"text":"click me to send \"hi\"","click_event":{"action":"run_command","command":"hi"}}

Next is the change in behavior, which has a greater impact:

• The command value is always valid, regardless of whether it starts with a / or not
• The client will strip the / prefix from the command value and send the remaining string as a command

It's no longer possible to correctly distinguish between "a run_command for sending chat message" and "a run_command for sending command"

As a workaround, LetMeClickAndSendForServer for MC >= 1.21.5 will only replace certain command with the /lmcas command.
By default, only command value starting with !!, which is a commonly-used command prefix
in MCDReforged plugin ecosystem, will be replaced

A config file located at ./config/letmeclickandsendforserver/config.json is added for customizing the replacing behavior

{
    "replacePattern": "!!.*"
}

The replacePattern should be a valid regex pattern. All command values that fully match the pattern will be replaced with the /lmcas command

To test with the default configuration, you can use:

/tellraw @a {"text":"click me to send \"!!MCDR\"","click_event":{"action":"run_command","command":"!!MCDR"}}

Requirements

It's a server-side only mod. It requires 0 extra dependency