From a37f44ed2058e006c63a71feff2c7468204b8a66 Mon Sep 17 00:00:00 2001 From: Badlop Date: Fri, 30 Dec 2022 19:48:27 +0100 Subject: [PATCH] mod_captcha_rust: New small module that uses Rust Captcha library --- mod_captcha_rust/COPYING | 342 +++++++++++++++++++++ mod_captcha_rust/README.md | 109 +++++++ mod_captcha_rust/conf/mod_captcha_rust.yml | 13 + mod_captcha_rust/lib/mod_captcha_rust.ex | 63 ++++ mod_captcha_rust/mod_captcha_rust.spec | 5 + 5 files changed, 532 insertions(+) create mode 100644 mod_captcha_rust/COPYING create mode 100644 mod_captcha_rust/README.md create mode 100644 mod_captcha_rust/conf/mod_captcha_rust.yml create mode 100644 mod_captcha_rust/lib/mod_captcha_rust.ex create mode 100644 mod_captcha_rust/mod_captcha_rust.spec diff --git a/mod_captcha_rust/COPYING b/mod_captcha_rust/COPYING new file mode 100644 index 0000000..cc498bd --- /dev/null +++ b/mod_captcha_rust/COPYING @@ -0,0 +1,342 @@ +As a special exception, the authors give permission to link this program +with the OpenSSL library and distribute the resulting binary. + + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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If this is what you want to do, use the GNU Lesser General +Public License instead of this License. diff --git a/mod_captcha_rust/README.md b/mod_captcha_rust/README.md new file mode 100644 index 0000000..ab7ea9c --- /dev/null +++ b/mod_captcha_rust/README.md @@ -0,0 +1,109 @@ +mod_captcha_rust - Generate CAPTCHAs using Rust library +======================================================= + +Requires: +- ejabberd 23.xx or higher compiled with Elixir +- Erlang/OTP and Elixir to ompile the `captcha_nif` Elixir library +- Rust compiler (package `rustc` in some package managers) + + +This small module generates CAPTCHA images suitable for ejabberd's +[CAPTCHA](https://docs.ejabberd.im/admin/configuration/basic/#captcha) feature, +thanks to the [captcha](https://github.com/feng19/captcha) Elixir library, +which internally uses the [captcha](https://github.com/daniel-e/captcha) Rust library. + + +Get captcha_nif library +----------------------- + +This module depends on an Elixir library, and there are two ways to get it installed, +depending if you compile ejabberd from source code or installed in binary: + +### A) ejabberd source code + +If you compile ejabberd from source code, go to the path with your +ejabberd source code and apply this small patch: +```diff +--- a/mix.exs ++++ b/mix.exs +@@ -99,6 +99,7 @@ defmodule Ejabberd.MixProject do + + defp deps do + [{:base64url, "~> 1.0"}, ++ {:captcha_nif, "~> 0.1", hex: :captcha_nif}, + {:cache_tab, "~> 1.0"}, + {:eimp, "~> 1.0"}, + {:ex_doc, ">= 0.0.0", only: :dev}, +``` + +Then get the new dependecies, and compile as usual: +``` +mix deps.get +make +``` + +Install ejabberd as usual, restart it +and now you can proceed to install `mod_captchanif`. + + +### B) ejabberd with binary installer + +If you installed ejabberd using some kind of binary installer, +you can download, compile and install the required library manually: + +``` +git clone https://github.com/feng19/captcha.git +cd captcha/ +mix deps.get +mix +mix release +``` + +Copy all the directories from `_build/dev/rel/captcha/lib` +to the path where you have ejabberd lib directories installed. + +Now you can restart ejabberd and proceed to install `mod_captchanif`. + + +Basic Configuration +------------------- + +The minimal configuration required to get this module working is: + +```yaml +captcha_cmd: 'Elixir.ModCaptchaRust' + +captcha_url: http://localhost:5280/captcha + +listen: + - + port: 5280 + module: ejabberd_http + request_handlers: + /captcha: ejabberd_captcha +``` + +Options +------- + +This module supports those configurable options: + +* `difficulty` + + Sets the CAPTCHA difficulty, it can be `easy`, `medium` or `hard`. + Default value: `easy`. + +* `color` + + Sets the CAPTCHA color, as a list of RGB integers from 0 to 255. + Default value: `[0, 0, 0]`. + + +Example of module configuration: + +```yaml +modules: + 'Elixir.ModCaptchaRust': + difficulty: hard + color: [255, 0, 0] +``` diff --git a/mod_captcha_rust/conf/mod_captcha_rust.yml b/mod_captcha_rust/conf/mod_captcha_rust.yml new file mode 100644 index 0000000..fa75ac4 --- /dev/null +++ b/mod_captcha_rust/conf/mod_captcha_rust.yml @@ -0,0 +1,13 @@ +captcha_cmd: 'Elixir.ModCaptchaRust' + +captcha_url: http://localhost:5288/captcha/ + +listen: + - + port: 5288 + module: ejabberd_http + request_handlers: + /captcha: ejabberd_captcha + +modules: + 'Elixir.ModCaptchaRust': {} diff --git a/mod_captcha_rust/lib/mod_captcha_rust.ex b/mod_captcha_rust/lib/mod_captcha_rust.ex new file mode 100644 index 0000000..529d062 --- /dev/null +++ b/mod_captcha_rust/lib/mod_captcha_rust.ex @@ -0,0 +1,63 @@ +defmodule ModCaptchaRust do + use Ejabberd.Module + + require Record + + ##==================================================================== + ## gen_mod callbacks + ##==================================================================== + + def start(_host, _opts) do + :ok + end + + def stop(_host) do + :ok + end + + def depends(_host, _opts) do + [] + end + + def mod_opt_type(:color) do + :econf.list(:econf.int(0, 255)) + end + + def mod_opt_type(:difficulty) do + :econf.enum([:easy, :medium, :hard]) + end + + def mod_options(_host) do + [ + {:color, [0, 0, 0]}, + {:difficulty, :easy}, + ] + end + + def mod_doc() do + %{:desc => 'This is just a demonstration.'} + end + + ##==================================================================== + ## Captcha Rust + ##==================================================================== + + def create_image(_key) do + [r, g, b] = get_opt(:color) + color = %{r: r, g: g, b: b} + + {captcha_text, captcha_image} = case get_opt(:difficulty) do + :easy -> Captcha.easy(set_color: color) + :medium -> Captcha.medium(set_color: color) + :hard -> Captcha.hard(set_color: color) + end + + {:ok, "image/png", captcha_text, captcha_image} + end + + def get_opt(option_name) do + host = List.first(:ejabberd_option.hosts()) + :gen_mod.get_module_opt(host, Elixir.ModCaptchaRust, option_name) + end + +end diff --git a/mod_captcha_rust/mod_captcha_rust.spec b/mod_captcha_rust/mod_captcha_rust.spec new file mode 100644 index 0000000..f0683df --- /dev/null +++ b/mod_captcha_rust/mod_captcha_rust.spec @@ -0,0 +1,5 @@ +author: "Badlop " +category: "captcha" +summary: "Generate CAPTCHAs using Rust library" +home: "https://github.com/processone/ejabberd-contrib/tree/master/" +url: "git@github.com:processone/ejabberd-contrib.git"