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Telegram Bot API low level and framework
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lib/ex_gram/token.ex
defmodule ExGram.Token do
@moduledoc """
Helpers when dealing with bot's tokens
"""
require Logger
@registry Registry.ExGram
@doc """
Main logic to extract the token of the bot.
The options can have the following keys:
- token: Explicit token to be used, this ignore everything else and will use this one
- bot: Bot name to be used, the token will be retrieved from the registry
- registry: Optional. Registry to extract the bot's token. By default will use ExGram.Registry.
Usage:
ExGram.Token.fetch() # Will take it from the config (config :ex_gram, token: "token")
ExGram.Token.fetch(token: "MyToken") # Will use the token
ExGram.Token.fetch(bot: :my_bot) # Will look in ExGram.Registry for :my_bot token
ExGram.Token.fetch(bot: :my_bot, registry: OtherRegistry) # Will look in OtherRegistry for :My_bot token
"""
@spec fetch(keyword) :: String.t() | nil
def fetch(ops \\ []) when is_list(ops) do
case {Keyword.get(ops, :token), Keyword.get(ops, :bot)} do
{nil, nil} ->
ExGram.Config.get(:ex_gram, :token)
{token, nil} ->
token
{nil, bot} ->
fetch_registry_token(bot, ops)
end
end
defp fetch_registry_token(bot, ops) do
registry = Keyword.get(ops, :registry, @registry)
case Registry.lookup(registry, bot) do
[{_, token} | _] when is_binary(token) ->
token
[{_, _other} | _] ->
Logger.warning(error_msg(:no_token, bot))
nil
_ ->
Logger.warning(error_msg(:no_bot, bot))
nil
end
end
defp error_msg(:no_token, bot) do
~s(The bot \"#{inspect(bot)}\" does not have a token specified. Did you started the bot with the token?
children = [
# ...
ExGram,
{MyBot, [method: :polling, token: token]}
]
)
end
defp error_msg(:no_bot, bot) do
~s(The bot \"#{inspect(bot)}\" is not registered. Make sure that this bot exists and is started.)
end
end