Initial functional version of feed subscription plugin, currently supporting only PuSH-enabled feeds.

1 files changed, 257 insertions, 0 deletions

diff --git a/plugins/FeedSub/actions/feedsubsettings.php b/plugins/FeedSub/actions/feedsubsettings.php
new file mode 100644
index 000000000..242224fac
--- /dev/null
+++ b/plugins/FeedSub/actions/feedsubsettings.php
@@ -0,0 +1,257 @@
+<?php
+/*
+ * StatusNet - the distributed open-source microblogging tool
+ * Copyright (C) 2009, StatusNet, Inc.
+ *
+ * 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/>.
+ */
+
+/**
+ * @package FeedSubPlugin
+ * @maintainer Brion Vibber <brion@status.net>
+ */
+
+if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
+
+class FeedSubSettingsAction extends ConnectSettingsAction
+{
+    protected $feedurl;
+    protected $preview;
+    protected $munger;
+
+    /**
+     * Title of the page
+     *
+     * @return string Title of the page
+     */
+
+    function title()
+    {
+        return dgettext('FeedSubPlugin', 'Feed subscriptions');
+    }
+
+    /**
+     * Instructions for use
+     *
+     * @return instructions for use
+     */
+
+    function getInstructions()
+    {
+        return dgettext('FeedSubPlugin',
+                        'You can subscribe to feeds from other sites; ' .
+                        'updates will appear in your personal timeline.');
+    }
+
+    /**
+     * Content area of the page
+     *
+     * Shows a form for associating a Twitter account with this
+     * StatusNet account. Also lets the user set preferences.
+     *
+     * @return void
+     */
+
+    function showContent()
+    {
+        $user = common_current_user();
+
+        $profile = $user->getProfile();
+
+        $fuser = null;
+
+        $flink = Foreign_link::getByUserID($user->id, FEEDSUB_SERVICE);
+
+        if (!empty($flink)) {
+            $fuser = $flink->getForeignUser();
+        }
+
+        $this->elementStart('form', array('method' => 'post',
+                                          'id' => 'form_settings_feedsub',
+                                          'class' => 'form_settings',
+                                          'action' =>
+                                          common_local_url('feedsubsettings')));
+
+        $this->hidden('token', common_session_token());
+
+        $this->elementStart('fieldset', array('id' => 'settings_feeds'));
+
+        $this->elementStart('ul', 'form_data');
+        $this->elementStart('li', array('id' => 'settings_twitter_login_button'));
+        $this->input('feedurl', _('Feed URL'), $this->feedurl, _('Enter the URL of a PubSubHubbub-enabled feed'));
+        $this->elementEnd('li');
+        $this->elementEnd('ul');
+
+        if ($this->preview) {
+            $this->submit('subscribe', dgettext('FeedSubPlugin', 'Subscribe'));
+        } else {
+            $this->submit('validate', dgettext('FeedSubPlugin', 'Continue'));
+        }
+
+        $this->elementEnd('fieldset');
+
+        $this->elementEnd('form');
+
+        if ($this->preview) {
+            $this->previewFeed();
+        }
+    }
+
+    /**
+     * Handle posts to this form
+     *
+     * Based on the button that was pressed, muxes out to other functions
+     * to do the actual task requested.
+     *
+     * All sub-functions reload the form with a message -- success or failure.
+     *
+     * @return void
+     */
+
+    function handlePost()
+    {
+        // CSRF protection
+        $token = $this->trimmed('token');
+        if (!$token || $token != common_session_token()) {
+            $this->showForm(_('There was a problem with your session token. '.
+                              'Try again, please.'));
+            return;
+        }
+
+        if ($this->arg('validate')) {
+            $this->validateAndPreview();
+        } else if ($this->arg('subscribe')) {
+            $this->saveFeed();
+        } else {
+            $this->showForm(_('Unexpected form submission.'));
+        }
+    }
+
+    /**
+     * Set up and add a feed
+     *
+     * @return boolean true if feed successfully read
+     * Sends you back to input form if not.
+     */
+    function validateFeed()
+    {
+        $feedurl = trim($this->arg('feedurl'));
+        
+        if ($feedurl == '') {
+            $this->showForm(dgettext('FeedSubPlugin',
+                                     'Empty feed URL!'));
+            return;
+        }
+        $this->feedurl = $feedurl;
+        
+        // Get the canonical feed URI and check it
+        try {
+            $discover = new FeedDiscovery();
+            $uri = $discover->discoverFromURL($feedurl);
+        } catch (FeedSubBadURLException $e) {
+            $this->showForm(dgettext('FeedSubPlugin', 'Invalid URL or could not reach server.'));
+            return false;
+        } catch (FeedSubBadResponseException $e) {
+            $this->showForm(dgettext('FeedSubPlugin', 'Cannot read feed; server returned error.'));
+            return false;
+        } catch (FeedSubEmptyException $e) {
+            $this->showForm(dgettext('FeedSubPlugin', 'Cannot read feed; server returned an empty page.'));
+            return false;
+        } catch (FeedSubBadHTMLException $e) {
+            $this->showForm(dgettext('FeedSubPlugin', 'Bad HTML, could not find feed link.'));
+            return false;
+        } catch (FeedSubNoFeedException $e) {
+            $this->showForm(dgettext('FeedSubPlugin', 'Could not find a feed linked from this URL.'));
+            return false;
+        } catch (FeedSubUnrecognizedTypeException $e) {
+            $this->showForm(dgettext('FeedSubPlugin', 'Not a recognized feed type.'));
+            return false;
+        } catch (FeedSubException $e) {
+            // Any new ones we forgot about
+            $this->showForm(dgettext('FeedSubPlugin', 'Bad feed URL.'));
+            return false;
+        }
+        
+        $this->munger = $discover->feedMunger();
+        $this->feedinfo = $this->munger->feedInfo();
+
+        if ($this->feedinfo->huburi == '') {
+            $this->showForm(dgettext('FeedSubPlugin', 'Feed is not PuSH-enabled; cannot subscribe.'));
+            return false;
+        }
+        
+        return true;
+    }
+
+    function saveFeed()
+    {
+        if ($this->validateFeed()) {
+            $this->preview = true;
+            $this->feedinfo = Feedinfo::ensureProfile($this->munger);
+
+            // If not already in use, subscribe to updates via the hub
+            if ($this->feedinfo->sub_start) {
+                common_log(LOG_INFO, __METHOD__ . ": double the fun! new sub for {$this->feedinfo->feeduri} last subbed {$this->feedinfo->sub_start}");
+            } else {
+                $ok = $this->feedinfo->subscribe();
+                common_log(LOG_INFO, __METHOD__ . ": sub was $ok");
+                if (!$ok) {
+                    $this->showForm(dgettext('FeedSubPlugin', 'Feed subscription failed! Bad response from hub.'));
+                    return;
+                }
+            }
+            
+            // And subscribe the current user to the local profile
+            $user = common_current_user();
+            $profile = $this->feedinfo->getProfile();
+            
+            if ($user->isSubscribed($profile)) {
+                $this->showForm(dgettext('FeedSubPlugin', 'Already subscribed!'));
+            } elseif ($user->subscribeTo($profile)) {
+                $this->showForm(dgettext('FeedSubPlugin', 'Feed subscribed!'));
+            } else {
+                $this->showForm(dgettext('FeedSubPlugin', 'Feed subscription failed!'));
+            }
+        }
+    }
+
+    function validateAndPreview()
+    {
+        if ($this->validateFeed()) {
+            $this->preview = true;
+            $this->showForm(dgettext('FeedSubPlugin', 'Previewing feed:'));
+        }
+    }
+
+    function previewFeed()
+    {
+        $feedinfo = $this->munger->feedinfo();
+        $notice = $this->munger->notice(0, true); // preview
+
+        if ($notice) {
+            $this->element('b', null, 'Preview of latest post from this feed:');
+
+            $item = new NoticeList($notice, $this);
+            $item->show();
+        } else {
+            $this->element('b', null, 'No posts in this feed yet.');
+        }
+    }
+
+    function showScripts()
+    {
+        parent::showScripts();
+        $this->autofocus('feedurl');
+    }
+}