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  1. +202 −0 LICENSE
  2. +54 −0 README
  3. +75 −0 mod_recaptcha.erl
  4. +61 −0 models/m_recaptcha.erl
  5. +24 −0 templates/_captcha.tpl
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+Copyright 2011 François Cardinaux, CH 1207 Geneva (
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+Unless required by applicable law or agreed to in writing, software
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+mod_recaptcha Readme File
+Author: François Cardinaux, CH 1207 Geneva (
+Overview of the current folder:
+ * The current folder is dedicated to the mod_recaptcha module for Zotonic
+ (
+ * It contains all files that are necessary to this project
+ * There is no symlink of any sort to external resources
+The following references have been helpful to write this module:
+ * the reCaptcha API:
+ * How to make HTTP post:
+ * recaptcha-erlang:
+ 1. Copy this folder to /path/to/zotonic/modules/
+ 2. Start Zotonic
+ 3. Open your site with a web browser and log in as admin
+ 4. Enable the Recaptcha module: go "Modules", find the "Recaptcha" module and
+ click on "activate"
+ 5. Go to "System" and click on "rescan modules"
+ 6. Edit your signup form template (typically signup.tpl) and add the following
+ line where you want the captcha to appear:
+ {% include "_captcha.tpl" %}
+ 1. Go to and follow the instructions to create
+ your Recaptcha keys (one public key and one private key)
+ 2. Go to "Config" and click on "make a new config setting"
+ Module: mod_recaptcha
+ Key: public_key
+ Value: <your public key>
+ 6. Always in "Config", click on "make a new config setting" again
+ Module: mod_recaptcha
+ Key: private_key
+ Value: <your private key>
@@ -0,0 +1,75 @@
+%% @author François Cardinaux, CH 1207 Geneva (
+%% and the owner of recaptcha-erlang (
+%% @copyright 2011 François Cardinaux
+%% @date 2011-09-18
+%% @doc Recaptcha module
+%% @todo Implement the use of the Ajax API (
+-author("François Cardinaux <>").
+-mod_description("Recaptcha module.").
+observe_signup_check(signup_check, {ok, Props, SignupProps}, Context) ->
+ Challenge = z_context:get_q("recaptcha_challenge_field", Context),
+ Response = z_context:get_q("recaptcha_response_field", Context),
+ case check_recaptcha(Challenge, Response, Context) of
+ ok ->
+ {ok, Props, SignupProps};
+ {error, _} = Error ->
+ Error
+ end.
+check_recaptcha(Challenge, Response, Context) ->
+ RemoteIP = "", %% @todo Replace this with the remote IP address
+ % Explanation:
+ % *
+ % *
+ inets:start(),
+ Data = string:join(
+ [
+ string:join(["privatekey", mochiweb_util:quote_plus(m_recaptcha:private_key(Context))], "="),
+ string:join(["remoteip", mochiweb_util:quote_plus(RemoteIP)], "="),
+ string:join(["challenge", mochiweb_util:quote_plus(Challenge)], "="),
+ string:join(["response", mochiweb_util:quote_plus(Response)], "=")
+ ], "&"),
+ HttpResponse =
+ httpc:request(
+ post,
+ {
+ get_recaptcha_verify_url(),
+ [],
+ "application/x-www-form-urlencoded",
+ Data
+ },
+ [], []),
+ case HttpResponse of
+ {ok, Result} ->
+ [FirstLine|NextLines] = case Result of
+ {_Status, _Headers, Body} -> string:tokens(Body, "\r\n");
+ {_Status, Body} -> string:tokens(Body, "\r\n")
+ end,
+ case FirstLine of
+ "true" ->
+ ok;
+ _ ->
+ {error, lists:flatten(NextLines)}
+ end;
+ {error, _} = Error ->
+ Error
+ end.
+get_recaptcha_verify_url() ->
+ "".
@@ -0,0 +1,61 @@
+%% @doc Recaptcha model
+%% @end
+%% @author François Cardinaux, CH 1207 Geneva (
+%% @copyright 2011 François Cardinaux
+-author("François Cardinaux <>").
+%% interface functions
+ % Callbacks for gen_model behaviour
+ m_find_value/3,
+ m_to_list/2,
+ m_value/2
+-export([private_key/1, public_key/1]).
+%% @doc Fetch the value for the key from a model source
+%% @spec m_find_value(Key, Source, Context) -> term()
+m_find_value(public_key, #m{value=undefined}, Context) ->
+ public_key(Context);
+m_find_value(_Key, #m{value=undefined}, _Context) ->
+ undefined.
+%% @doc Transform a m_config value to a list, used for template loops
+%% @spec m_to_list(Source, Context)
+m_to_list(_, _Context) ->
+ [].
+%% @doc Transform a model value so that it can be formatted or piped through filters
+%% @spec m_value(Source, Context) -> term()
+m_value(#m{value=undefined}, _Context) ->
+ undefined.
+private_key(Context) ->
+ get_key(private_key, Context).
+public_key(Context) ->
+ get_key(public_key, Context).
+get_key(Type, Context) ->
+ Val = m_config:get_value(mod_recaptcha, Type, Context),
+ SVal = if
+ is_binary(Val) ->
+ binary_to_list(Val);
+ true ->
+ Val
+ end,
+ string:strip(SVal).
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