Move OpenID-related files to OpenID plugin directory

As a first step to pluginizing our OpenID support, I've moved the
important OpenID-related files to a dedicated plugin directory. Many
of these classes are still referred to by libraries that are still in
core.

plugins/OpenID/finishaddopenid.php

@@ -0,0 +1,185 @@
+<?php
+/**
+ * Laconica, the distributed open-source microblogging tool
+ *
+ * Complete adding an OpenID
+ *
+ * PHP version 5
+ *
+ * LICENCE: This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @category  Settings
+ * @package   Laconica
+ * @author    Evan Prodromou <evan@controlyourself.ca>
+ * @copyright 2008-2009 Control Yourself, Inc.
+ * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link      http://laconi.ca/
+ */
+
+if (!defined('LACONICA')) {
+    exit(1);
+}
+
+require_once INSTALLDIR.'/lib/openid.php';
+
+/**
+ * Complete adding an OpenID
+ *
+ * Handle the return from an OpenID verification
+ *
+ * @category Settings
+ * @package  Laconica
+ * @author   Evan Prodromou <evan@controlyourself.ca>
+ * @license  http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link     http://laconi.ca/
+ */
+
+class FinishaddopenidAction extends Action
+{
+    var $msg = null;
+
+    /**
+     * Handle the redirect back from OpenID confirmation
+     *
+     * Check to see if the user's logged in, and then try
+     * to use the OpenID login system.
+     *
+     * @param array $args $_REQUEST arguments
+     *
+     * @return void
+     */
+
+    function handle($args)
+    {
+        parent::handle($args);
+        if (!common_logged_in()) {
+            $this->clientError(_('Not logged in.'));
+        } else {
+            $this->tryLogin();
+        }
+    }
+
+    /**
+     * Try to log in using OpenID
+     *
+     * Check the OpenID for validity; potentially store it.
+     *
+     * @return void
+     */
+
+    function tryLogin()
+    {
+        $consumer =& oid_consumer();
+
+        $response = $consumer->complete(common_local_url('finishaddopenid'));
+
+        if ($response->status == Auth_OpenID_CANCEL) {
+            $this->message(_('OpenID authentication cancelled.'));
+            return;
+        } else if ($response->status == Auth_OpenID_FAILURE) {
+            // Authentication failed; display the error message.
+            $this->message(sprintf(_('OpenID authentication failed: %s'),
+                                   $response->message));
+        } else if ($response->status == Auth_OpenID_SUCCESS) {
+
+            $display   = $response->getDisplayIdentifier();
+            $canonical = ($response->endpoint && $response->endpoint->canonicalID) ?
+              $response->endpoint->canonicalID : $display;
+
+            $sreg_resp = Auth_OpenID_SRegResponse::fromSuccessResponse($response);
+
+            if ($sreg_resp) {
+                $sreg = $sreg_resp->contents();
+            }
+
+            $cur =& common_current_user();
+
+            $other = oid_get_user($canonical);
+
+            if ($other) {
+                if ($other->id == $cur->id) {
+                    $this->message(_('You already have this OpenID!'));
+                } else {
+                    $this->message(_('Someone else already has this OpenID.'));
+                }
+                return;
+            }
+
+            // start a transaction
+
+            $cur->query('BEGIN');
+
+            $result = oid_link_user($cur->id, $canonical, $display);
+
+            if (!$result) {
+                $this->message(_('Error connecting user.'));
+                return;
+            }
+            if ($sreg) {
+                if (!oid_update_user($cur, $sreg)) {
+                    $this->message(_('Error updating profile'));
+                    return;
+                }
+            }
+
+            // success!
+
+            $cur->query('COMMIT');
+
+            oid_set_last($display);
+
+            common_redirect(common_local_url('openidsettings'), 303);
+        }
+    }
+
+    /**
+     * Show a failure message
+     *
+     * Something went wrong. Save the message, and show the page.
+     *
+     * @param string $msg Error message to show
+     *
+     * @return void
+     */
+
+    function message($msg)
+    {
+        $this->message = $msg;
+        $this->showPage();
+    }
+
+    /**
+     * Title of the page
+     *
+     * @return string title
+     */
+
+    function title()
+    {
+        return _('OpenID Login');
+    }
+
+    /**
+     * Show error message
+     *
+     * @return void
+     */
+
+    function showPageNotice()
+    {
+        if ($this->message) {
+            $this->element('p', 'error', $this->message);
+        }
+    }
+}