From f2497c3146a167c4c12e3389ade62cf495186d9b Mon Sep 17 00:00:00 2001 From: Badlop Date: Mon, 26 Dec 2022 17:02:02 +0100 Subject: [PATCH] mod_ecaptcha: New small module that uses ecaptcha library --- mod_ecaptcha/COPYING | 342 +++++++++++++++++++++++++++++ mod_ecaptcha/README.md | 105 +++++++++ mod_ecaptcha/conf/mod_ecaptcha.yml | 13 ++ mod_ecaptcha/mod_ecaptcha.spec | 5 + mod_ecaptcha/rebar.config | 3 + mod_ecaptcha/src/mod_ecaptcha.erl | 95 ++++++++ 6 files changed, 563 insertions(+) create mode 100644 mod_ecaptcha/COPYING create mode 100644 mod_ecaptcha/README.md create mode 100644 mod_ecaptcha/conf/mod_ecaptcha.yml create mode 100644 mod_ecaptcha/mod_ecaptcha.spec create mode 100644 mod_ecaptcha/rebar.config create mode 100644 mod_ecaptcha/src/mod_ecaptcha.erl diff --git a/mod_ecaptcha/COPYING b/mod_ecaptcha/COPYING new file mode 100644 index 0000000..cc498bd --- /dev/null +++ b/mod_ecaptcha/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_ecaptcha/README.md b/mod_ecaptcha/README.md new file mode 100644 index 0000000..b3aa8cc --- /dev/null +++ b/mod_ecaptcha/README.md @@ -0,0 +1,105 @@ +mod_ecaptcha - Generate CAPTCHAs using ecaptcha +=============================================== + +Requires: +- ejabberd 23.xx or higher +- C compiler and makefile +- write access to ejabberd's priv dir + + +This small module uses the +[ecaptcha](https://github.com/seriyps/ecaptcha) +erlang library to generate CAPTCHA images suitable for ejabberd's +[CAPTCHA](https://docs.ejabberd.im/admin/configuration/basic/#captcha) feature. + + +Basic Configuration +------------------- + +The minimal configuration required to get this module working is: + +```yaml +captcha_cmd: mod_ecaptcha + +captcha_url: http://localhost:5280/captcha + +listen: + - + port: 5280 + module: ejabberd_http + request_handlers: + /captcha: ejabberd_captcha + +modules: + mod_ecaptcha: {} +``` + + +Options +------- + +The configurable options match mostly the ones from ecaptcha library: + +- `numchars` + + Number of characters to include in the CAPTCHA image. + Default: `5` + +- `effects` + + List of effects to use to generate the CAPTCHA image. + Check [ecaptcha usage](https://github.com/seriyps/ecaptcha#usage) + for details. + Default: `[line, blur, filter, dots, reverse_dots]` + +- `color` + + This option defines the image's color. Valid values: + `black`, `red`, `orange`, `blue`, `pink` or `purple`. + Default: `black` + +- `alphabet` + + String containing all the characters that can be printed on the image + (duplicates are ok). + The default value includes: numbers, latin characters lower and upper case. + +- `font` + + String of one of the supported fonts. + Please notice that fonts are pre-rendered at NIF compile-time, + see the `deps/ecaptcha/c_src/fonts.h` and `FONTS` parameter in `deps/ecaptcha/c_src/Makefile`. + Default: `hplhs-oldstyle` + + +Example Configuration +--------------------- + +This example configuration setups CAPTCHA images that are simple to solve: +just 3 characters, only the vocals in lower and upper case. + +It also setups `mod_register_web`, you can test the feature immediately +visiting `http://localhost:5280/register/` + +```yaml +captcha_cmd: mod_ecaptcha + +captcha_url: http://localhost:5280/captcha + +listen: + - + port: 5280 + module: ejabberd_http + request_handlers: + /captcha: ejabberd_captcha + /register: mod_register_web + +modules: + mod_ecaptcha: + numchars: 3 + effects: [line, dots] + color: red + alphabet: "aeiouAEIOU" + font: "hplhs-oldstyle" +``` + diff --git a/mod_ecaptcha/conf/mod_ecaptcha.yml b/mod_ecaptcha/conf/mod_ecaptcha.yml new file mode 100644 index 0000000..b00a734 --- /dev/null +++ b/mod_ecaptcha/conf/mod_ecaptcha.yml @@ -0,0 +1,13 @@ +captcha_cmd: mod_ecaptcha + +captcha_url: http://localhost:5288/captcha/ + +listen: + - + port: 5288 + module: ejabberd_http + request_handlers: + /captcha: ejabberd_captcha + +modules: + mod_ecaptcha: {} diff --git a/mod_ecaptcha/mod_ecaptcha.spec b/mod_ecaptcha/mod_ecaptcha.spec new file mode 100644 index 0000000..51cb047 --- /dev/null +++ b/mod_ecaptcha/mod_ecaptcha.spec @@ -0,0 +1,5 @@ +author: "Badlop " +category: "captcha" +summary: "Generate CAPTCHAs using ecaptcha" +home: "https://github.com/processone/ejabberd-contrib/tree/master/" +url: "git@github.com:processone/ejabberd-contrib.git" diff --git a/mod_ecaptcha/rebar.config b/mod_ecaptcha/rebar.config new file mode 100644 index 0000000..12252a8 --- /dev/null +++ b/mod_ecaptcha/rebar.config @@ -0,0 +1,3 @@ +{deps, [ + {ecaptcha, ".*", {git, "https://github.com/seriyps/ecaptcha", {branch, "master"}}} + ]}. diff --git a/mod_ecaptcha/src/mod_ecaptcha.erl b/mod_ecaptcha/src/mod_ecaptcha.erl new file mode 100644 index 0000000..3a76c57 --- /dev/null +++ b/mod_ecaptcha/src/mod_ecaptcha.erl @@ -0,0 +1,95 @@ +%%%---------------------------------------------------------------------- +%%% File : mod_ecaptcha.erl +%%% Author : Badlop +%%% Purpose : Generate CAPTCHAs using ecaptcha +%%% Created : +%%% +%%% +%%% ejabberd, Copyright (C) 2002-2022 ProcessOne +%%% +%%% This program is free software; you can redistribute it and/or +%%% modify it under the terms of the GNU General Public License as +%%% published by the Free Software Foundation; either version 2 of the +%%% License, or (at your option) any later version. +%%% +%%% This program is distributed in the hope that it will be useful, +%%% but WITHOUT ANY WARRANTY; without even the implied warranty of +%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +%%% General Public License for more details. +%%% +%%% You should have received a copy of the GNU General Public License along +%%% with this program; if not, write to the Free Software Foundation, Inc., +%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. +%%% +%%%---------------------------------------------------------------------- + +-module(mod_ecaptcha). +-author('badlop@process-one.net'). + +-behaviour(gen_mod). + +-export([start/2, stop/1, depends/2, mod_options/1, mod_opt_type/1, mod_doc/0]). +-export([create_image/1]). + +%% --------------------- +%% gen_mod +%% --------------------- + +start(_Host, _Opts) -> + ok. + +stop(_Host) -> + ok. + +depends(_Host, _Opts) -> + []. + +mod_opt_type(numchars) -> + econf:int(1, 7); + +mod_opt_type(effects) -> + econf:list(econf:enum([line, blur, filter, dots, reverse_dots])); + +mod_opt_type(color) -> + econf:atom(); + +mod_opt_type(alphabet) -> + econf:binary(); + +mod_opt_type(font) -> + econf:binary(). + +mod_options(_Host) -> + [{numchars, 5}, + {effects, [line, blur, filter, dots, reverse_dots]}, + {color, black}, + {alphabet, <<"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ">>}, + {font, <<"hplhs-oldstyle">>} + ]. + +mod_doc() -> + #{}. + +%% --------------------- +%% CAPTCHA generation +%% --------------------- + +create_image(_Key) -> + Response = ecaptcha:png( + get_opt(numchars), + #{effects => get_opt(effects), + color => get_opt(color), + alphabet => get_opt(alphabet), + font => get_opt(font)} + ), + case Response of + {Phrase, PNGImage} when is_binary(PNGImage) -> + PNGBin = binary:list_to_bin([PNGImage]), + {ok, <<"image/png">>, Phrase, PNGBin}; + {error, Reason} -> + {error, Reason} + end. + +get_opt(OptionName) -> + Host = hd(ejabberd_option:hosts()), + gen_mod:get_module_opt(Host, ?MODULE, OptionName).