akkoma/lib/pleroma/captcha.ex

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Elixir
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defmodule Pleroma.Captcha do
use GenServer
@ets __MODULE__.Ets
@ets_options [:ordered_set, :private, :named_table, {:read_concurrency, true}]
@doc false
def start_link() do
GenServer.start_link(__MODULE__, [], name: __MODULE__)
end
@doc false
def init(_) do
@ets = :ets.new(@ets, @ets_options)
{:ok, nil}
end
def new() do
GenServer.call(__MODULE__, :new)
end
def validate(token, captcha) do
GenServer.call(__MODULE__, {:validate, token, captcha})
end
@doc false
def handle_call(:new, _from, state) do
method = Pleroma.Config.get!([__MODULE__, :method])
case method do
__MODULE__.Kocaptcha ->
endpoint = Pleroma.Config.get!([method, :endpoint])
case HTTPoison.get(endpoint <> "/new") do
{:error, _} ->
%{error: "Kocaptcha service unavailable"}
{:ok, res} ->
json_resp = Poison.decode!(res.body)
token = json_resp["token"]
true = :ets.insert(@ets, {token, json_resp["md5"]})
{
:reply,
%{type: :kocaptcha, token: token, url: endpoint <> json_resp["url"]},
state
}
end
end
end
@doc false
def handle_call({:validate, token, captcha}, _from, state) do
with false <- is_nil(captcha),
[{^token, saved_md5}] <- :ets.lookup(@ets, token),
true <- (:crypto.hash(:md5, captcha) |> Base.encode16) == String.upcase(saved_md5) do
# Clear the saved value
:ets.delete(@ets, token)
{:reply, true, state}
else
e -> IO.inspect(e); {:reply, false, state}
end
end
end