[feature/oauth] Start linking/registering OAuth accounts during login

PHPBB3-11673

phpBB/includes/constants.php

@@ -61,6 +61,7 @@ define('LOGIN_CONTINUE', 1);
 define('LOGIN_BREAK', 2);
 define('LOGIN_SUCCESS', 3);
 define('LOGIN_SUCCESS_CREATE_PROFILE', 20);
+define('LOGIN_SUCCESS_LINK_PROFILE', 21);
 define('LOGIN_ERROR_USERNAME', 10);
 define('LOGIN_ERROR_PASSWORD', 11);
 define('LOGIN_ERROR_ACTIVE', 12);

phpBB/phpbb/auth/auth.php

@@ -970,6 +970,21 @@ class phpbb_auth
 				);
 			}
 
+			// If the auth provider wants us to link an empty account do so and redirect
+			if ($login['status'] == LOGIN_SUCCESS_LINK_PROFILE)
+			{
+				// If this status exists a fourth field is in the $login array called 'redirect_data'
+				// This data is passed along as GET data to the next page allow the account to be linked
+				$url = 'ucp.php?mode=login_link';
+
+				foreach ($login['redirect_data'] as $key => $value)
+				{
+					$url .= '&' . $key . '=' . $value;
+				}
+
+				redirect($url);
+			}
+
 			// If login succeeded, we will log the user in... else we pass the login array through...
 			if ($login['status'] == LOGIN_SUCCESS)
 			{

phpBB/phpbb/auth/provider/interface.php

@@ -45,6 +45,11 @@ interface phpbb_auth_provider_interface
 	 *							'error_msg' => string
 	 *							'user_row' => array
 	 *						)
+	 *					A fourth key of the array may be present 'redirect_data'
+	 *					This key is only used when 'status' is equal to
+	 *					LOGIN_SUCCESS_LINK_PROFILE and it's value is an
+	 *					associative array that is turned into GET variables on
+	 *					the redirect url.
 	 */
 	public function login($username, $password);
 

phpBB/phpbb/auth/provider/oauth/oauth.php

@@ -172,7 +172,15 @@ class phpbb_auth_provider_oauth extends phpbb_auth_provider_base
 			if (!$row)
 			{
 				// The user does not yet exist, ask if they wish to register the account
-				throw new Exception($unique_id);
+				return array(
+					'status'		=> LOGIN_SUCCESS_LINK_PROFILE,
+					'error_msg'		=> 'LOGIN_OAUTH_ACCOUNT_NOT_LINKED',
+					'user_row'		=> array(),
+					'redirect_data'	=> array(
+						'auth_provider'	=> 'oauth',
+						'oauth_service'	=> $service_name_original,
+					),
+				);
 			}
 
 			// Retrieve the user's account