Whitelist/Blacklist mail domain

administrator/components/com_users/config.xml

@@ -33,11 +33,22 @@
 			checksuperusergroup="1"
 		/>
 
-		<field
- 			name="allowedMailDomain"
- 			type="text"
-			label="COM_USERS_CONFIG_FIELD_ALLOWED_MAILDOMAIN_LABEL"
-			description="COM_USERS_CONFIG_FIELD_ALLOWED_MAILDOMAIN_DESC"
+		<field 
+			name="whiteListMailDomain" 
+			type="textarea" 
+			label="COM_USERS_CONFIG_FIELD_WHITELIST_MAILDOMAIN_LABEL" 
+			description="COM_USERS_CONFIG_FIELD_WHITELIST_MAILDOMAIN_DESC" 
+			rows="7" 
+			cols="3" 
+		/>
+
+		<field 
+			name="blackListMailDomain" 
+			type="textarea" 
+			label="COM_USERS_CONFIG_FIELD_BLACKLIST_MAILDOMAIN_LABEL" 
+			description="COM_USERS_CONFIG_FIELD_BLACKLIST_MAILDOMAIN_DESC" 
+			rows="7" 
+			cols="3" 
 		/>
 
 		<field

administrator/language/en-GB/en-GB.com_users.ini

@@ -15,10 +15,10 @@ COM_USERS_BATCH_OPTIONS="Batch process the selected users"
 COM_USERS_BATCH_SET="Set To Group"
 COM_USERS_CATEGORIES_TITLE="User Notes: Categories"
 COM_USERS_CATEGORY_HEADING="Category"
-COM_USERS_CONFIG_FIELD_ALLOWED_MAILDOMAIN_DESC="Mail domain only allowed to register on the site. Example: gmail.com"
-COM_USERS_CONFIG_FIELD_ALLOWED_MAILDOMAIN_LABEL="Unique mail domain"
 COM_USERS_CONFIG_FIELD_ALLOWREGISTRATION_DESC="If set to Yes, new Users are allowed to self-register."
 COM_USERS_CONFIG_FIELD_ALLOWREGISTRATION_LABEL="Allow User Registration"
+COM_USERS_CONFIG_FIELD_BLACKLIST_MAILDOMAIN_LABEL="Blacklist mail domain"
+COM_USERS_CONFIG_FIELD_BLACKLIST_MAILDOMAIN_DESC="Accept all mail domain except for those in the blacklist. Enter each domain in a new line. Example of a domain: gmail.com"
 COM_USERS_CONFIG_FIELD_CAPTCHA_DESC="Select the captcha plugin that will be used in the registration, password and username reminder forms. You may need to enter required information for your captcha plugin in the Plugin Manager.<br />If 'Use Global' is selected, make sure a captcha plugin is selected in Global Configuration."
 COM_USERS_CONFIG_FIELD_CAPTCHA_LABEL="Captcha"
 COM_USERS_CONFIG_FIELD_CHANGEUSERNAME_DESC="Allow users to change their Username when editing their profile."
@@ -56,6 +56,8 @@ COM_USERS_CONFIG_FIELD_USERACTIVATION_DESC="If set to None the user will be regi
 COM_USERS_CONFIG_FIELD_USERACTIVATION_LABEL="New User Account Activation"
 COM_USERS_CONFIG_FIELD_USERACTIVATION_OPTION_ADMINACTIVATION="Administrator"
 COM_USERS_CONFIG_FIELD_USERACTIVATION_OPTION_SELFACTIVATION="Self"
+COM_USERS_CONFIG_FIELD_WHITELIST_MAILDOMAIN_LABEL="Whitelist mail domain"
+COM_USERS_CONFIG_FIELD_WHITELIST_MAILDOMAIN_DESC="Accept only the mail domains that are within this list. Enter each domain in a new line. Example of a domain: gmail.com"
 COM_USERS_CONFIG_IMPORT_FAILED="An error was encountered while importing the configuration: %s."
 COM_USERS_CONFIG_INTEGRATION_SETTINGS_DESC="These settings determine how the Users Component will integrate with other extensions."
 COM_USERS_CONFIG_PASSWORD_OPTIONS="Password Options"

components/com_users/models/registration.php

@@ -422,11 +422,12 @@ public function register($temp)
 		$data['password'] = $data['password1'];
 		$useractivation = $params->get('useractivation');
 		$sendpassword = $params->get('sendpassword', 1);
-		$allowedMailDomain = $params->get('allowedMailDomain');
-
-		// Check in case can only register under a single mail domain
+		$whiteListMailDomain = explode("\r\n", $params->get('whiteListMailDomain'));
+		$blackListMailDomain = explode("\r\n", $params->get('blackListMailDomain'));
 		$userMailDomain = explode('@',$data['email']);
-		if (!empty($allowedMailDomain) && $userMailDomain[1] != $allowedMailDomain) 
+
+		// Check if the user mail domain is disallowed
+		if ((!empty($blackListMailDomain) && in_array($userMailDomain[1], $blackListMailDomain)) || (!empty($whiteListMailDomain) && !in_array($userMailDomain[1], $whiteListMailDomain))) 
 		{
 			$this->setError(JText::sprintf('COM_USERS_REGISTRATION_USER_MAIL_DOMAIN_NOT_ALLOWED_MESSAGE', $userMailDomain[1]));