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Telegram Bot API low level and framework
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lib/ex_gram/middleware/ignore_username.ex
defmodule ExGram.Middleware.IgnoreUsername do
@moduledoc """
Middleware that ignore the username in the command parameter.
`/command@bot_username` will be transformed to `/command` before handling the message
"""
use ExGram.Middleware
alias ExGram.Cnt
def call(
%Cnt{
bot_info: %{username: username},
update: %{message: %{text: t} = message} = update
} = cnt,
_opts
)
when is_binary(username) and is_binary(t) do
new_text = clean_command(t, username)
new_msg = %{message | text: new_text}
new_update = %{update | message: new_msg}
%{cnt | update: new_update}
end
def call(cnt, _), do: cnt
defp clean_command("/" <> text, username) do
[raw_command | rest] = String.split(text, " ")
cmd =
case String.split(raw_command, "@") do
[command, ^username] -> "/" <> command
_ -> "/" <> raw_command
end
[cmd | rest] |> Enum.join(" ")
end
defp clean_command(text, _username), do: text
end