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MDL-13796 Most of the recaptcha implementation is done.

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commit 5d6308d491e6dcba87afdb1f0438311c3e07a393 1 parent 7d47ca3
nicolasconnault authored
View
4 admin/settings/users.php
@@ -25,7 +25,9 @@
get_string('authinstructions', 'auth'), ''));
$temp->add(new admin_setting_configtext('allowemailaddresses', get_string('allowemailaddresses', 'admin'), get_string('configallowemailaddresses', 'admin'), '', PARAM_NOTAGS));
$temp->add(new admin_setting_configtext('denyemailaddresses', get_string('denyemailaddresses', 'admin'), get_string('configdenyemailaddresses', 'admin'), '', PARAM_NOTAGS));
-
+
+ $temp->add(new admin_setting_configtext('recaptchapublickey', get_string('recaptchapublickey', 'admin'), get_string('configrecaptchapublickey', 'admin'), '', PARAM_NOTAGS));
+ $temp->add(new admin_setting_configtext('recaptchaprivatekey', get_string('recaptchaprivatekey', 'admin'), get_string('configrecaptchaprivatekey', 'admin'), '', PARAM_NOTAGS));
$ADMIN->add('authsettings', $temp);
View
7 auth/email/auth.php
@@ -197,6 +197,13 @@ function config_form($config, $err, $user_fields) {
* Processes and stores configuration data for this authentication plugin.
*/
function process_config($config) {
+ // set to defaults if undefined
+ if (!isset($config->recaptcha)) {
+ $config->recaptcha = false;
+ }
+
+ // save settings
+ set_config('recaptcha', $config->recaptcha, 'auth/email');
return true;
}
View
20 auth/email/config.html
@@ -1,7 +1,25 @@
<!-- No config needed -->
-<div style="text-align: center"><?php print_string('none'); ?></div>
+<?php
+ // set to defaults if undefined
+ if (!isset($config->recaptcha)) {
+ $config->recaptcha = false;
+ }
+
+ $yesno = array( get_string('no'), get_string('yes') );
+
+?>
<table cellspacing="0" cellpadding="5" border="0">
+<tr>
+ <td colspan="3">
+ <h2 class="main"><?php print_string('auth_emailsettings', 'auth') ?> </h2>
+ </td>
+</tr>
+<tr>
+ <td align="right"><label for="recaptcha"><?php print_string('auth_emailrecaptcha_key', 'auth') ?></label></td>
+ <td><?php choose_from_menu($yesno, 'recaptcha', $config->recaptcha, ''); ?></td>
+ <td><?php print_string('auth_emailrecaptcha', 'auth') ?></td>
+</tr>
<?php
print_auth_lock_options('email', $user_fields, get_string('auth_fieldlocks_help', 'auth'), false, false);
View
4 lang/en_utf8/admin.php
@@ -188,6 +188,8 @@
</pre>If this is left empty, no password is required.';
$string['configrcache'] = 'Use the cache to store database records. Remember to set \'cachetype\' as well!';
$string['configrcachettl'] = 'Time-to-live for cached records, in seconds. Use a short (&lt;15) value here.';
+$string['configrecaptchaprivatekey'] = 'String of characters used to communicate between your Moodle server and the recaptcha.net server. Obtain one for this site by visiting http://recaptcha.net';
+$string['configrecaptchapublickey'] = 'String of characters used to display the reCAPTCHA element in the signup form. Generated by http://recaptcha.net';
$string['configrequestedstudentname'] = 'Word for student used in requested courses';
$string['configrequestedstudentsname'] = 'Word for students used in requested courses';
$string['configrequestedteachername'] = 'Word for teacher used in requested courses';
@@ -586,6 +588,8 @@
$string['questioncwqpfsok'] = 'Good. There are no \'random\' questions in your quizzes that are set up to select questions from a mixture of shared and unshared question categories.';
$string['rcache'] = 'Record cache';
$string['rcachettl'] = 'Record cache TTL';
+$string['recaptchapublickey'] = 'ReCAPTCHA public key';
+$string['recaptchaprivatekey'] = 'ReCAPTCHA private key';
$string['releasenoteslink'] = 'For information about this version of Moodle, please see the online <a target=\"_blank\" href=\"$a\">Release Notes</a>';
$string['remotelangnotavailable'] = 'Because Moodle can not connect to download.moodle.org, we are unable to do language pack installation automatically. Please download the appropriate zip file(s) from the list below, copy them to your $a directory and unzip them manually.';
$string['renameerrors'] = 'Rename errors';
View
10 lang/en_utf8/auth.php
@@ -117,6 +117,9 @@
$string['auth_emailtitle'] = 'Email-based self-registration';
$string['auth_emailnoinsert'] = 'Could not add your record to the database!';
$string['auth_emailnoemail'] = 'Tried to send you an email but failed!';
+$string['auth_emailrecaptcha'] = 'Adds a visual/audio confirmation form element to the signup page for email self-registering users. This protects your site against spammers and contributes to a worthwhile cause. See http://recaptcha.net/learnmore.html for more details.';
+$string['auth_emailrecaptcha_key'] = 'Enable reCAPTCHA element';
+$string['auth_emailsettings'] = 'Settings';
// FirstClass plugin
$string['auth_fccreators'] = 'List of groups whose members are allowed to create new courses. Separate multiple groups with \';\'. Names must be spelled exactly as on FirstClass server. System is case-sensitive.';
@@ -374,5 +377,10 @@
$string['unlocked'] = 'Unlocked';
$string['unlockedifempty'] = 'Unlocked if empty';
$string['locked'] = 'Locked';
-
+$string['incorrectpleasetryagain'] = 'Incorrect. Please try again.';
+$string['enterthewordsabove'] = 'Enter the words above:';
+$string['enterthenumbersyouhear'] = 'Enter the numbers you hear:';
+$string['getanothercaptcha'] = 'Get another CAPTCHA';
+$string['getanaudiocaptcha'] = 'Get an audio CAPTCHA';
+$string['getanimagecaptcha'] = 'Get an image CAPTCHA';
?>
View
2  lang/en_utf8/help/grade/decimalpoints.html
@@ -1,2 +1,2 @@
<h1>Overall decimal points</h1>
-<p>Specifies the number of decimal points to display for each grade. This setting may be overridden per grading item.</p>
+<p>Specifies the number of decimal points to display for each grade. This setting has no effect on grade calculations, which are made with an accuracy of 5 decimal places.</p>
View
77 lang/en_utf8/help/grade/index.html
@@ -1,10 +1,71 @@
<h2>Grade</h2>
<ul>
- <li><a href="help.php?module=grade&amp;file=category.html">Category</a></li>
- <li><a href="help.php?module=grade&amp;file=exceptions.html">Exceptions</a></li>
- <li><a href="help.php?module=grade&amp;file=teacher.html">Grades</a></li>
- <li><a href="help.php?module=grade&amp;file=letter.html">Letter Scale</a></li>
- <li><a href="help.php?module=grade&amp;file=preferences.html">Set Preferences</a></li>
- <li><a href="help.php?module=grade&amp;file=student.html">Student Grade Help</a></li>
- <li><a href="help.php?module=grade&amp;file=weight.html">Weight</a></li>
-</ul>
+ <li><a href="help.php?module=grade&amp;file=aggregateonlygraded.html">Aggregate only non-empty grades</a></li>
+ <li><a href="help.php?module=grade&amp;file=aggregateoutcomes.html">Include outcomes in aggregation</a></li>
+ <li><a href="help.php?module=grade&amp;file=aggregatesubcats.html">Aggregate including subcategories</a></li>
+ <li><a href="help.php?module=grade&amp;file=aggregation.html">Category aggregation</a></li>
+ <li><a href="help.php?module=grade&amp;file=aggregationcoefextra.html">Extra credit</a></li>
+ <li><a href="help.php?module=grade&amp;file=aggregationcoefextrasum.html">Extra credit</a></li>
+ <li><a href="help.php?module=grade&amp;file=aggregationcoefweight.html">Item weight</a></li>
+ <li><a href="help.php?module=grade&amp;file=aggregationposition.html">Aggregation position</a></li>
+ <li><a href="help.php?module=grade&amp;file=aggregationview.html">Aggregation view</a></li>
+ <li><a href="help.php?module=grade&amp;file=averagesdecimalpoints.html">Decimals in column averages</a></li>
+ <li><a href="help.php?module=grade&amp;file=averagesdisplaytype.html">Column averages display type</a></li>
+ <li><a href="help.php?module=grade&amp;file=calculation.html">Calculations</a></li>
+ <li><a href="help.php?module=grade&amp;file=category.html">Category</a></li>
+ <li><a href="help.php?module=grade&amp;file=decimalpoints.html">Overall decimal points</a></li>
+ <li><a href="help.php?module=grade&amp;file=droplow.html">Drop the lowest</a></li>
+ <li><a href="help.php?module=grade&amp;file=exceptions.html">Exceptions</a></li>
+ <li><a href="help.php?module=grade&amp;file=excluded.html">Excluded grades</a></li>
+ <li><a href="help.php?module=grade&amp;file=exportdecimalpoints.html">Export decimal points</a></li>
+ <li><a href="help.php?module=grade&amp;file=feedback.html">Feedback</a></li>
+ <li><a href="help.php?module=grade&amp;file=finalgrade.html">Final grade</a></li>
+ <li><a href="help.php?module=grade&amp;file=gradeboundary.html">Grade boundary</a></li>
+ <li><a href="help.php?module=grade&amp;file=gradedisplaytype.html">Grade display type</a></li>
+ <li><a href="help.php?module=grade&amp;file=gradeexportdisplaytype.html">Grade export display type</a></li>
+ <li><a href="help.php?module=grade&amp;file=gradeletter.html">Grade letters</a></li>
+ <li><a href="help.php?module=grade&amp;file=grademax.html">Maximum Grade</a></li>
+ <li><a href="help.php?module=grade&amp;file=grademin.html">Minimum Grade</a></li>
+ <li><a href="help.php?module=grade&amp;file=gradepass.html">Grade to pass</a></li>
+ <li><a href="help.php?module=grade&amp;file=gradetype.html">Grade type</a></li>
+ <li><a href="help.php?module=grade&amp;file=hidden.html">Hidden</a></li>
+ <li><a href="help.php?module=grade&amp;file=hiddenuntil.html">Hidden until</a></li>
+ <li><a href="help.php?module=grade&amp;file=idnumber.html">Id numbers</a></li>
+ <li><a href="help.php?module=grade&amp;file=iteminfo.html">Item info</a></li>
+ <li><a href="help.php?module=grade&amp;file=keephigh.html">Keep the highest</a></li>
+ <li><a href="help.php?module=grade&amp;file=letter.html">Letter scale</a></li>
+ <li><a href="help.php?module=grade&amp;file=linkedactivity.html">Linked activity</a></li>
+ <li><a href="help.php?module=grade&amp;file=locked.html">Locked</a></li>
+ <li><a href="help.php?module=grade&amp;file=lockedafter.html">Locked after</a></li>
+ <li><a href="help.php?module=grade&amp;file=meanselection.html">Grades selected for column averages</a></li>
+ <li><a href="help.php?module=grade&amp;file=multfactor.html">Multiplicator</a></li>
+ <li><a href="help.php?module=grade&amp;file=outcomeid.html">Outcome</a></li>
+ <li><a href="help.php?module=grade&amp;file=outcomestandard.html">Standard outcomes</a></li>
+ <li><a href="help.php?module=grade&amp;file=overridden.html">Overridden</a></li>
+ <li><a href="help.php?module=grade&amp;file=overridesitedefaultgradedisplaytype.html">Override site defaults</a></li>
+ <li><a href="help.php?module=grade&amp;file=plusfactor.html">Offset</a></li>
+ <li><a href="help.php?module=grade&amp;file=preferences.html">Set Preferences</a></li>
+ <li><a href="help.php?module=grade&amp;file=quickgrading.html">Quick grading</a></li>
+ <li><a href="help.php?module=grade&amp;file=rangesdecimalpoints.html">Decimals shown in ranges</a></li>
+ <li><a href="help.php?module=grade&amp;file=rangesdisplaytype.html">Range display type</a></li>
+ <li><a href="help.php?module=grade&amp;file=scaleid.html">Scale</a></li>
+ <li><a href="help.php?module=grade&amp;file=scalestandard.html">Standard scales</a></li>
+ <li><a href="help.php?module=grade&amp;file=showactivityicons.html">Show activity icons</a></li>
+ <li><a href="help.php?module=grade&amp;file=showaverages.html">Show averages</a></li>
+ <li><a href="help.php?module=grade&amp;file=showcalculations.html">Show calculations</a></li>
+ <li><a href="help.php?module=grade&amp;file=showeyecons.html"></a>Show show/hide icons</li>
+ <li><a href="help.php?module=grade&amp;file=showfeedback.html">Show feedback</a></li>
+ <li><a href="help.php?module=grade&amp;file=showgroups.html">Show groups</a></li>
+ <li><a href="help.php?module=grade&amp;file=showhiddenitems.html">Show hidden items</a></li>
+ <li><a href="help.php?module=grade&amp;file=showlocks.html">Show locks</a></li>
+ <li><a href="help.php?module=grade&amp;file=shownumberofgrades.html">Show number of grades</a></li>
+ <li><a href="help.php?module=grade&amp;file=showquickfeedback.html">Show quick feedback</a></li>
+ <li><a href="help.php?module=grade&amp;file=showranges.html">Show ranges</a></li>
+ <li><a href="help.php?module=grade&amp;file=showrank.html">Show rank</a></li>
+ <li><a href="help.php?module=grade&amp;file=showuseridnumber.html">Show user id numbers</a></li>
+ <li><a href="help.php?module=grade&amp;file=student.html">Student Grade Help</a></li>
+ <li><a href="help.php?module=grade&amp;file=studentsperpage.html">Students per page</a></li>
+ <li><a href="help.php?module=grade&amp;file=teacher.html">Grades</a></li>
+ <li><a href="help.php?module=grade&amp;file=userkey.html">User key</a></li>
+ <li><a href="help.php?module=grade&amp;file=weight.html">Weight</a></li>
+</ul>
View
84 lib/form/recaptcha.php
@@ -0,0 +1,84 @@
+<?php
+/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
+
+/**
+ * textarea_counter.php
+ *
+ * @category Admin
+ * @package admin
+ * @author Nicolas Connault <nicolasconnault@gmail.com>
+ * @version $Id$
+ */
+
+
+/**
+ * @category Admin
+ * @package admin
+ */
+class MoodleQuickForm_recaptcha extends HTML_QuickForm_input {
+
+ /**
+ * <code>
+ * $form->addElement('textarea_counter', 'message', 'Message',
+ * array('cols'=>60, 'rows'=>10), 160);
+ * </code>
+ */
+ function HTML_QuickForm_recaptcha($elementName = null, $elementLabel = null, $attributes = null) {
+ parent::HTML_QuickForm_input($elementName, $elementLabel, $attributes);
+ $this->_type = 'recaptcha';
+ }
+
+ /**
+ * Returns the recaptcha element in HTML
+ *
+ * @since 1.0
+ * @access public
+ * @return string
+ */
+ function toHtml() {
+ global $CFG;
+ require_once $CFG->libdir . '/recaptchalib.php';
+
+ $html = '<script type="text/javascript">
+ var RecaptchaOptions = {
+ theme : \'custom\',
+ tabindex : 2,
+ custom_theme_widget : \'recaptcha_widget\'
+ };
+ </script>' . "\n";
+
+
+ if (empty($_SESSION['recaptcha_error'])) {
+ $_SESSION['recaptcha_error'] = null;
+ }
+ $error = $_SESSION['recaptcha_error'];
+ unset($_SESSION['recaptcha_error']);
+
+ $strincorrectpleasetryagain = get_string('incorrectpleasetryagain', 'auth');
+ $strenterthewordsabove = get_string('enterthewordsabove', 'auth');
+ $strenterthenumbersyouhear = get_string('enterthenumbersyouhear', 'auth');
+ $strgetanothercaptcha = get_string('getanothercaptcha', 'auth');
+ $strgetanaudiocaptcha = get_string('getanaudiocaptcha', 'auth');
+ $strgetanimagecaptcha = get_string('getanimagecaptcha', 'auth');
+
+ $html .= '
+<div id="recaptcha_widget" style="display:none">
+
+<div id="recaptcha_image"></div>
+<div class="recaptcha_only_if_incorrect_sol" style="color:red">' . $strincorrectpleasetryagain . '</div>
+
+<span class="recaptcha_only_if_image">' . $strenterthewordsabove . '</span>
+<span class="recaptcha_only_if_audio">' . $strenterthenumbersyouhear . '</span>
+
+<input type="text" id="recaptcha_response_field" name="recaptcha_response_field" />
+
+<div><a href="javascript:Recaptcha.reload()">' . $strgetanothercaptcha . '</a></div>
+<div class="recaptcha_only_if_image"><a href="javascript:Recaptcha.switch_type(\'audio\')">' . $strgetanaudiocaptcha . '</a></div>
+<div class="recaptcha_only_if_audio"><a href="javascript:Recaptcha.switch_type(\'image\')">' . $strgetanimagecaptcha . '</a></div>
+</div>';
+
+ return $html . recaptcha_get_html($CFG->recaptchapublickey, $error);
+ }
+}
+
+?>
View
1  lib/formslib.php
@@ -1876,4 +1876,5 @@ function getStopFieldsetElements(){
MoodleQuickForm::registerElementType('submit', "$CFG->libdir/form/submit.php", 'MoodleQuickForm_submit');
MoodleQuickForm::registerElementType('questioncategory', "$CFG->libdir/form/questioncategory.php", 'MoodleQuickForm_questioncategory');
MoodleQuickForm::registerElementType('advcheckbox', "$CFG->libdir/form/advcheckbox.php", 'MoodleQuickForm_advcheckbox');
+MoodleQuickForm::registerElementType('recaptcha', "$CFG->libdir/form/recaptcha.php", 'MoodleQuickForm_recaptcha');
?>
View
276 lib/recaptchalib.php
@@ -0,0 +1,276 @@
+<?php
+/*
+ * This is a PHP library that handles calling reCAPTCHA.
+ * - Documentation and latest version
+ * http://recaptcha.net/plugins/php/
+ * - Get a reCAPTCHA API Key
+ * http://recaptcha.net/api/getkey
+ * - Discussion group
+ * http://groups.google.com/group/recaptcha
+ *
+ * Copyright (c) 2007 reCAPTCHA -- http://recaptcha.net
+ * AUTHORS:
+ * Mike Crawford
+ * Ben Maurer
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/**
+ * The reCAPTCHA server URL's
+ */
+define("RECAPTCHA_API_SERVER", "http://api.recaptcha.net");
+define("RECAPTCHA_API_SECURE_SERVER", "https://api-secure.recaptcha.net");
+define("RECAPTCHA_VERIFY_SERVER", "api-verify.recaptcha.net");
+
+/**
+ * Encodes the given data into a query string format
+ * @param $data - array of string elements to be encoded
+ * @return string - encoded request
+ */
+function _recaptcha_qsencode ($data) {
+ $req = "";
+ foreach ( $data as $key => $value )
+ $req .= $key . '=' . urlencode( stripslashes($value) ) . '&';
+
+ // Cut the last '&'
+ $req=substr($req,0,strlen($req)-1);
+ return $req;
+}
+
+
+
+/**
+ * Submits an HTTP POST to a reCAPTCHA server
+ * @param string $host
+ * @param string $path
+ * @param array $data
+ * @param int port
+ * @return array response
+ */
+function _recaptcha_http_post($host, $path, $data, $port = 80) {
+
+ $req = _recaptcha_qsencode ($data);
+
+ $http_request = "POST $path HTTP/1.0\r\n";
+ $http_request .= "Host: $host\r\n";
+ $http_request .= "Content-Type: application/x-www-form-urlencoded;\r\n";
+ $http_request .= "Content-Length: " . strlen($req) . "\r\n";
+ $http_request .= "User-Agent: reCAPTCHA/PHP\r\n";
+ $http_request .= "\r\n";
+ $http_request .= $req;
+
+ $response = '';
+ if( false == ( $fs = @fsockopen($host, $port, $errno, $errstr, 10) ) ) {
+ die ('Could not open socket');
+ }
+
+ fwrite($fs, $http_request);
+
+ while ( !feof($fs) )
+ $response .= fgets($fs, 1160); // One TCP-IP packet
+ fclose($fs);
+ $response = explode("\r\n\r\n", $response, 2);
+
+ return $response;
+}
+
+
+
+/**
+ * Gets the challenge HTML (javascript and non-javascript version).
+ * This is called from the browser, and the resulting reCAPTCHA HTML widget
+ * is embedded within the HTML form it was called from.
+ * @param string $pubkey A public key for reCAPTCHA
+ * @param string $error The error given by reCAPTCHA (optional, default is null)
+ * @param boolean $use_ssl Should the request be made over ssl? (optional, default is false)
+
+ * @return string - The HTML to be embedded in the user's form.
+ */
+function recaptcha_get_html ($pubkey, $error = null, $use_ssl = false)
+{
+ if ($pubkey == null || $pubkey == '') {
+ die ("To use reCAPTCHA you must get an API key from <a href='http://recaptcha.net/api/getkey'>http://recaptcha.net/api/getkey</a>");
+ }
+
+ if ($use_ssl) {
+ $server = RECAPTCHA_API_SECURE_SERVER;
+ } else {
+ $server = RECAPTCHA_API_SERVER;
+ }
+
+ $errorpart = "";
+ if ($error) {
+ $errorpart = "&amp;error=" . $error;
+ }
+ return '<script type="text/javascript" src="'. $server . '/challenge?k=' . $pubkey . $errorpart . '"></script>
+
+ <noscript>
+ <iframe src="'. $server . '/noscript?k=' . $pubkey . $errorpart . '" height="300" width="500" frameborder="0"></iframe><br>
+ <textarea name="recaptcha_challenge_field" rows="3" cols="40"></textarea>
+ <input type="hidden" name="recaptcha_response_field" value="manual_challenge">
+ </noscript>';
+}
+
+
+
+
+/**
+ * A ReCaptchaResponse is returned from recaptcha_check_answer()
+ */
+class ReCaptchaResponse {
+ var $is_valid;
+ var $error;
+}
+
+
+/**
+ * Calls an HTTP POST function to verify if the user's guess was correct
+ * @param string $privkey
+ * @param string $remoteip
+ * @param string $challenge
+ * @param string $response
+ * @return ReCaptchaResponse
+ */
+function recaptcha_check_answer ($privkey, $remoteip, $challenge, $response)
+{
+ if ($privkey == null || $privkey == '') {
+ die ("To use reCAPTCHA you must get an API key from <a href='http://recaptcha.net/api/getkey'>http://recaptcha.net/api/getkey</a>");
+ }
+
+ if ($remoteip == null || $remoteip == '') {
+ die ("For security reasons, you must pass the remote ip to reCAPTCHA");
+ }
+
+
+
+ //discard spam submissions
+ if ($challenge == null || strlen($challenge) == 0 || $response == null || strlen($response) == 0) {
+ $recaptcha_response = new ReCaptchaResponse();
+ $recaptcha_response->is_valid = false;
+ $recaptcha_response->error = 'incorrect-captcha-sol';
+ return $recaptcha_response;
+ }
+
+ $response = _recaptcha_http_post (RECAPTCHA_VERIFY_SERVER, "/verify",
+ array (
+ 'privatekey' => $privkey,
+ 'remoteip' => $remoteip,
+ 'challenge' => $challenge,
+ 'response' => $response
+ )
+ );
+
+ $answers = explode ("\n", $response [1]);
+ $recaptcha_response = new ReCaptchaResponse();
+
+ if (trim ($answers [0]) == 'true') {
+ $recaptcha_response->is_valid = true;
+ }
+ else {
+ $recaptcha_response->is_valid = false;
+ $recaptcha_response->error = $answers [1];
+ }
+ return $recaptcha_response;
+
+}
+
+/**
+ * gets a URL where the user can sign up for reCAPTCHA. If your application
+ * has a configuration page where you enter a key, you should provide a link
+ * using this function.
+ * @param string $domain The domain where the page is hosted
+ * @param string $appname The name of your application
+ */
+function recaptcha_get_signup_url ($domain = null, $appname = null) {
+ return "http://recaptcha.net/api/getkey?" . _recaptcha_qsencode (array ('domain' => $domain, 'app' => $appname));
+}
+
+function _recaptcha_aes_pad($val) {
+ $block_size = 16;
+ $numpad = $block_size - (strlen ($val) % $block_size);
+ return str_pad($val, strlen ($val) + $numpad, chr($numpad));
+}
+
+/* Mailhide related code */
+
+function _recaptcha_aes_encrypt($val,$ky) {
+ if (! function_exists ("mcrypt_encrypt")) {
+ die ("To use reCAPTCHA Mailhide, you need to have the mcrypt php module installed.");
+ }
+ $mode=MCRYPT_MODE_CBC;
+ $enc=MCRYPT_RIJNDAEL_128;
+ $val=_recaptcha_aes_pad($val);
+ return mcrypt_encrypt($enc, $ky, $val, $mode, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0");
+}
+
+
+function _recaptcha_mailhide_urlbase64 ($x) {
+ return strtr(base64_encode ($x), '+/', '-_');
+}
+
+/* gets the reCAPTCHA Mailhide url for a given email, public key and private key */
+function recaptcha_mailhide_url($pubkey, $privkey, $email) {
+ if ($pubkey == '' || $pubkey == null || $privkey == "" || $privkey == null) {
+ die ("To use reCAPTCHA Mailhide, you have to sign up for a public and private key, " .
+ "you can do so at <a href='http://mailhide.recaptcha.net/apikey'>http://mailhide.recaptcha.net/apikey</a>");
+ }
+
+
+ $ky = pack('H*', $privkey);
+ $cryptmail = _recaptcha_aes_encrypt ($email, $ky);
+
+ return "http://mailhide.recaptcha.net/d?k=" . $pubkey . "&c=" . _recaptcha_mailhide_urlbase64 ($cryptmail);
+}
+
+/**
+ * gets the parts of the email to expose to the user.
+ * eg, given johndoe@example,com return ["john", "example.com"].
+ * the email is then displayed as john...@example.com
+ */
+function _recaptcha_mailhide_email_parts ($email) {
+ $arr = preg_split("/@/", $email );
+
+ if (strlen ($arr[0]) <= 4) {
+ $arr[0] = substr ($arr[0], 0, 1);
+ } else if (strlen ($arr[0]) <= 6) {
+ $arr[0] = substr ($arr[0], 0, 3);
+ } else {
+ $arr[0] = substr ($arr[0], 0, 4);
+ }
+ return $arr;
+}
+
+/**
+ * Gets html to display an email address given a public an private key.
+ * to get a key, go to:
+ *
+ * http://mailhide.recaptcha.net/apikey
+ */
+function recaptcha_mailhide_html($pubkey, $privkey, $email) {
+ $emailparts = _recaptcha_mailhide_email_parts ($email);
+ $url = recaptcha_mailhide_url ($pubkey, $privkey, $email);
+
+ return htmlentities($emailparts[0]) . "<a href='" . htmlentities ($url) .
+ "' onclick=\"window.open('" . htmlentities ($url) . "', '', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width=500,height=300'); return false;\" title=\"Reveal this e-mail address\">...</a>@" . htmlentities ($emailparts [1]);
+
+}
+
+
+?>
View
13 login/signup.php
@@ -1,7 +1,18 @@
<?php // $Id$
require_once('../config.php');
+
+ /**
+ * Returns whether or not the captcha element is enabled, and the admin settings fulfil its requirements.
+ * @return bool
+ */
+ function signup_captcha_enabled() {
+ global $CFG;
+ return isset($CFG->recaptchapublickey) && isset($CFG->recaptchaprivatekey) && get_config('auth/email', 'recaptcha');
+ }
+
require_once('signup_form.php');
+
if (empty($CFG->registerauth)) {
error("Sorry, you may not use this page.");
@@ -48,7 +59,7 @@
$navlinks[] = array('name' => $newaccount, 'link' => null, 'type' => 'misc');
$navigation = build_navigation($navlinks);
print_header($newaccount, $newaccount, $navigation, $mform_signup->focus(), "", true, "<div class=\"langmenu\">$langmenu</div>");
-
+
$mform_signup->display();
print_footer();
View
16 login/signup_form.php
@@ -62,6 +62,10 @@ function definition() {
}else{
$mform->setDefault('country', '');
}
+
+ if (signup_captcha_enabled()) {
+ $mform->addElement('recaptcha', 'recaptcha_element', get_string('visualconfirmation'));
+ }
profile_signup_fields($mform);
@@ -131,6 +135,18 @@ function validation($data, $files) {
if (!check_password_policy($data['password'], $errmsg)) {
$errors['password'] = $errmsg;
}
+
+ if (signup_captcha_enabled()) {
+ require_once $CFG->libdir . '/recaptchalib.php';
+ $response = recaptcha_check_answer($CFG->recaptchaprivatekey,
+ $_SERVER['REMOTE_ADDR'],
+ $this->_form->_submitValues['recaptcha_challenge_field'],
+ $this->_form->_submitValues['recaptcha_response_field']);
+ if (!$response->is_valid) {
+ $_SESSION['recaptcha_error'] = $response->error;
+ $errors['recaptcha'] = $response->error;
+ }
+ }
return $errors;
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