/plugins/OStatus/classes/Ostatus_profile.php

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<?php
/*
 * StatusNet - the distributed open-source microblogging tool
 * Copyright (C) 2009-2010, 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/>.
 */

if (!defined('STATUSNET')) {
    exit(1);
}

/**
 * @package OStatusPlugin
 * @maintainer Brion Vibber <brion@status.net>
 */
class Ostatus_profile extends Managed_DataObject
{
    public $__table = 'ostatus_profile';

    public $uri;

    public $profile_id;
    public $group_id;
    public $peopletag_id;

    public $feeduri;
    public $salmonuri;
    public $avatar; // remote URL of the last avatar we saved

    public $created;
    public $modified;

    /**
     * Return table definition for Schema setup and DB_DataObject usage.
     *
     * @return array array of column definitions
     */
    static function schemaDef()
    {
        return array(
            'fields' => array(
                'uri' => array('type' => 'varchar', 'length' => 255, 'not null' => true),
                'profile_id' => array('type' => 'integer'),
                'group_id' => array('type' => 'integer'),
                'peopletag_id' => array('type' => 'integer'),
                'feeduri' => array('type' => 'varchar', 'length' => 255),
                'salmonuri' => array('type' => 'varchar', 'length' => 255),
                'avatar' => array('type' => 'text'),
                'created' => array('type' => 'datetime', 'not null' => true),
                'modified' => array('type' => 'datetime', 'not null' => true),
            ),
            'primary key' => array('uri'),
            'unique keys' => array(
                'ostatus_profile_profile_id_key' => array('profile_id'),
                'ostatus_profile_group_id_key' => array('group_id'),
                'ostatus_profile_peopletag_id_key' => array('peopletag_id'),
                'ostatus_profile_feeduri_key' => array('feeduri'),
            ),
            'foreign keys' => array(
                'ostatus_profile_profile_id_fkey' => array('profile', array('profile_id' => 'id')),
                'ostatus_profile_group_id_fkey' => array('user_group', array('group_id' => 'id')),
                'ostatus_profile_peopletag_id_fkey' => array('profile_list', array('peopletag_id' => 'id')),
            ),
        );
    }

    public function getUri()
    {
        return $this->uri;
    }

    /**
     * Fetch the locally stored profile for this feed
     * @return Profile
     * @throws NoProfileException if it was not found
     */
    public function localProfile()
    {
        $profile = Profile::getKV('id', $this->profile_id);
        if ($profile instanceof Profile) {
            return $profile;
        }
        throw new NoProfileException($this->profile_id);
    }

    /**
     * Fetch the StatusNet-side profile for this feed
     * @return Profile
     */
    public function localGroup()
    {
        if ($this->group_id) {
            return User_group::getKV('id', $this->group_id);
        }
        return null;
    }

    /**
     * Fetch the StatusNet-side peopletag for this feed
     * @return Profile
     */
    public function localPeopletag()
    {
        if ($this->peopletag_id) {
            return Profile_list::getKV('id', $this->peopletag_id);
        }
        return null;
    }

    /**
     * Returns an ActivityObject describing this remote user or group profile.
     * Can then be used to generate Atom chunks.
     *
     * @return ActivityObject
     */
    function asActivityObject()
    {
        if ($this->isGroup()) {
            return ActivityObject::fromGroup($this->localGroup());
        } else if ($this->isPeopletag()) {
            return ActivityObject::fromPeopletag($this->localPeopletag());
        } else {
            return ActivityObject::fromProfile($this->localProfile());
        }
    }

    /**
     * Returns an XML string fragment with profile information as an
     * Activity Streams noun object with the given element type.
     *
     * Assumes that 'activity' namespace has been previously defined.
     *
     * @todo FIXME: Replace with wrappers on asActivityObject when it's got everything.
     *
     * @param string $element one of 'actor', 'subject', 'object', 'target'
     * @return string
     */
    function asActivityNoun($element)
    {
        if ($this->isGroup()) {
            $noun = ActivityObject::fromGroup($this->localGroup());
            return $noun->asString('activity:' . $element);
        } else if ($this->isPeopletag()) {
            $noun = ActivityObject::fromPeopletag($this->localPeopletag());
            return $noun->asString('activity:' . $element);
        } else {
            $noun = ActivityObject::fromProfile($this->localProfile());
            return $noun->asString('activity:' . $element);
        }
    }

    /**
     * @return boolean true if this is a remote group
     */
    function isGroup()
    {
        if ($this->profile_id || $this->peopletag_id && !$this->group_id) {
            return false;
        } else if ($this->group_id && !$this->profile_id && !$this->peopletag_id) {
            return true;
        } else if ($this->group_id && ($this->profile_id || $this->peopletag_id)) {
            // TRANS: Server exception. %s is a URI
            throw new ServerException(sprintf(_m('Invalid ostatus_profile state: Two or more IDs set for %s.'), $this->getUri()));
        } else {
            // TRANS: Server exception. %s is a URI
            throw new ServerException(sprintf(_m('Invalid ostatus_profile state: All IDs empty for %s.'), $this->getUri()));
        }
    }

    /**
     * @return boolean true if this is a remote peopletag
     */
    function isPeopletag()
    {
        if ($this->profile_id || $this->group_id && !$this->peopletag_id) {
            return false;
        } else if ($this->peopletag_id && !$this->profile_id && !$this->group_id) {
            return true;
        } else if ($this->peopletag_id && ($this->profile_id || $this->group_id)) {
            // TRANS: Server exception. %s is a URI
            throw new ServerException(sprintf(_m('Invalid ostatus_profile state: Two or more IDs set for %s.'), $this->getUri()));
        } else {
            // TRANS: Server exception. %s is a URI
            throw new ServerException(sprintf(_m('Invalid ostatus_profile state: All IDs empty for %s.'), $this->getUri()));
        }
    }

    /**
     * Send a subscription request to the hub for this feed.
     * The hub will later send us a confirmation POST to /main/push/callback.
     *
     * @return void
     * @throws ServerException if feed state is not valid or subscription fails.
     */
    public function subscribe()
    {
        $feedsub = FeedSub::ensureFeed($this->feeduri);
        if ($feedsub->sub_state == 'active') {
            // Active subscription, we don't need to do anything.
            return;
        }

        // Inactive or we got left in an inconsistent state.
        // Run a subscription request to make sure we're current!
        return $feedsub->subscribe();
    }

    /**
     * Check if this remote profile has any active local subscriptions, and
     * if not drop the PuSH subscription feed.
     *
     * @return boolean true if subscription is removed, false if there are still subscribers to the feed
     * @throws Exception of various kinds on failure.
     */
    public function unsubscribe() {
        return $this->garbageCollect();
    }

    /**
     * Check if this remote profile has any active local subscriptions, and
     * if not drop the PuSH subscription feed.
     *
     * @return boolean true if subscription is removed, false if there are still subscribers to the feed
     * @throws Exception of various kinds on failure.
     */
    public function garbageCollect()
    {
        $feedsub = FeedSub::getKV('uri', $this->feeduri);
        return $feedsub->garbageCollect();
    }

    /**
     * Check if this remote profile has any active local subscriptions, so the
     * PuSH subscription layer can decide if it can drop the feed.
     *
     * This gets called via the FeedSubSubscriberCount event when running
     * FeedSub::garbageCollect().
     *
     * @return int
     * @throws NoProfileException if there is no local profile for the object
     */
    public function subscriberCount()
    {
        if ($this->isGroup()) {
            $members = $this->localGroup()->getMembers(0, 1);
            $count = $members->N;
        } else if ($this->isPeopletag()) {
            $subscribers = $this->localPeopletag()->getSubscribers(0, 1);
            $count = $subscribers->N;
        } else {
            $profile = $this->localProfile();
            if ($profile->hasLocalTags()) {
                $count = 1;
            } else {
                $count = $profile->subscriberCount();
            }
        }
        common_log(LOG_INFO, __METHOD__ . " SUB COUNT BEFORE: $count");

        // Other plugins may be piggybacking on OStatus without having
        // an active group or user-to-user subscription we know about.
        Event::handle('Ostatus_profileSubscriberCount', array($this, &$count));
        common_log(LOG_INFO, __METHOD__ . " SUB COUNT AFTER: $count");

        return $count;
    }

    /**
     * Send an Activity Streams notification to the remote Salmon endpoint,
     * if so configured.
     *
     * @param Profile $actor  Actor who did the activity
     * @param string  $verb   Activity::SUBSCRIBE or Activity::JOIN
     * @param Object  $object object of the action; must define asActivityNoun($tag)
     */
    public function notify($actor, $verb, $object=null, $target=null)
    {
        if (!($actor instanceof Profile)) {
            $type = gettype($actor);
            if ($type == 'object') {
                $type = get_class($actor);
            }
            // TRANS: Server exception.
            // TRANS: %1$s is the method name the exception occured in, %2$s is the actor type.
            throw new ServerException(sprintf(_m('Invalid actor passed to %1$s: %2$s.'),__METHOD__,$type));
        }
        if ($object == null) {
            $object = $this;
        }
        if ($this->salmonuri) {
            $text = 'update';
            $id = TagURI::mint('%s:%s:%s',
                               $verb,
                               $actor->getURI(),
                               common_date_iso8601(time()));

            // @todo FIXME: Consolidate all these NS settings somewhere.
            $attributes = array('xmlns' => Activity::ATOM,
                                'xmlns:activity' => 'http://activitystrea.ms/spec/1.0/',
                                'xmlns:thr' => 'http://purl.org/syndication/thread/1.0',
                                'xmlns:georss' => 'http://www.georss.org/georss',
                                'xmlns:ostatus' => 'http://ostatus.org/schema/1.0',
                                'xmlns:poco' => 'http://portablecontacts.net/spec/1.0',
                                'xmlns:media' => 'http://purl.org/syndication/atommedia');

            $entry = new XMLStringer();
            $entry->elementStart('entry', $attributes);
            $entry->element('id', null, $id);
            $entry->element('title', null, $text);
            $entry->element('summary', null, $text);
            $entry->element('published', null, common_date_w3dtf(common_sql_now()));

            $entry->element('activity:verb', null, $verb);
            $entry->raw($actor->asAtomAuthor());
            $entry->raw($actor->asActivityActor());
            $entry->raw($object->asActivityNoun('object'));
            if ($target != null) {
                $entry->raw($target->asActivityNoun('target'));
            }
            $entry->elementEnd('entry');

            $xml = $entry->getString();
            common_log(LOG_INFO, "Posting to Salmon endpoint $this->salmonuri: $xml");

            $salmon = new Salmon(); // ?
            return $salmon->post($this->salmonuri, $xml, $actor);
        }
        return false;
    }

    /**
     * Send a Salmon notification ping immediately, and confirm that we got
     * an acceptable response from the remote site.
     *
     * @param mixed $entry XML string, Notice, or Activity
     * @param Profile $actor
     * @return boolean success
     */
    public function notifyActivity($entry, Profile $actor)
    {
        if ($this->salmonuri) {
            $salmon = new Salmon();
            return $salmon->post($this->salmonuri, $this->notifyPrepXml($entry), $actor);
        }
        common_debug(__CLASS__.' error: No salmonuri for Ostatus_profile uri: '.$this->uri);

        return false;
    }

    /**
     * Queue a Salmon notification for later. If queues are disabled we'll
     * send immediately but won't get the return value.
     *
     * @param mixed $entry XML string, Notice, or Activity
     * @return boolean success
     */
    public function notifyDeferred($entry, $actor)
    {
        if ($this->salmonuri) {
            $data = array('salmonuri' => $this->salmonuri,
                          'entry' => $this->notifyPrepXml($entry),
                          'actor' => $actor->id);

            $qm = QueueManager::get();
            return $qm->enqueue($data, 'salmon');
        }

        return false;
    }

    protected function notifyPrepXml($entry)
    {
        $preamble = '<?xml version="1.0" encoding="UTF-8" ?' . '>';
        if (is_string($entry)) {
            return $entry;
        } else if ($entry instanceof Activity) {
            return $preamble . $entry->asString(true);
        } else if ($entry instanceof Notice) {
            return $preamble . $entry->asAtomEntry(true, true);
        } else {
            // TRANS: Server exception.
            throw new ServerException(_m('Invalid type passed to Ostatus_profile::notify. It must be XML string or Activity entry.'));
        }
    }

    function getBestName()
    {
        if ($this->isGroup()) {
            return $this->localGroup()->getBestName();
        } else if ($this->isPeopletag()) {
            return $this->localPeopletag()->getBestName();
        } else {
            return $this->localProfile()->getBestName();
        }
    }

    /**
     * Read and post notices for updates from the feed.
     * Currently assumes that all items in the feed are new,
     * coming from a PuSH hub.
     *
     * @param DOMDocument $doc
     * @param string $source identifier ("push")
     */
    public function processFeed(DOMDocument $doc, $source)
    {
        $feed = $doc->documentElement;

        if ($feed->localName == 'feed' && $feed->namespaceURI == Activity::ATOM) {
            $this->processAtomFeed($feed, $source);
        } else if ($feed->localName == 'rss') { // @todo FIXME: Check namespace.
            $this->processRssFeed($feed, $source);
        } else {
            // TRANS: Exception.
            throw new Exception(_m('Unknown feed format.'));
        }
    }

    public function processAtomFeed(DOMElement $feed, $source)
    {
        $entries = $feed->getElementsByTagNameNS(Activity::ATOM, 'entry');
        if ($entries->length == 0) {
            common_log(LOG_ERR, __METHOD__ . ": no entries in feed update, ignoring");
            return;
        }

        for ($i = 0; $i < $entries->length; $i++) {
            $entry = $entries->item($i);
            $this->processEntry($entry, $feed, $source);
        }
    }

    public function processRssFeed(DOMElement $rss, $source)
    {
        $channels = $rss->getElementsByTagName('channel');

        if ($channels->length == 0) {
            // TRANS: Exception.
            throw new Exception(_m('RSS feed without a channel.'));
        } else if ($channels->length > 1) {
            common_log(LOG_WARNING, __METHOD__ . ": more than one channel in an RSS feed");
        }

        $channel = $channels->item(0);

        $items = $channel->getElementsByTagName('item');

        for ($i = 0; $i < $items->length; $i++) {
            $item = $items->item($i);
            $this->processEntry($item, $channel, $source);
        }
    }

    /**
     * Process a posted entry from this feed source.
     *
     * @param DOMElement $entry
     * @param DOMElement $feed for context
     * @param string $source identifier ("push" or "salmon")
     *
     * @return Notice Notice representing the new (or existing) activity
     */
    public function processEntry($entry, $feed, $source)
    {
        $activity = new Activity($entry, $feed);
        return $this->processActivity($activity, $source);
    }

    // TODO: Make this throw an exception
    public function processActivity($activity, $source)
    {
        $notice = null;

        // The "WithProfile" events were added later.

        if (Event::handle('StartHandleFeedEntryWithProfile', array($activity, $this, &$notice)) &&
            Event::handle('StartHandleFeedEntry', array($activity))) {

            switch ($activity->verb) {
            case ActivityVerb::POST:
                // @todo process all activity objects
                switch ($activity->objects[0]->type) {
                case ActivityObject::ARTICLE:
                case ActivityObject::BLOGENTRY:
                case ActivityObject::NOTE:
                case ActivityObject::STATUS:
                case ActivityObject::COMMENT:
                case null:
                    $notice = $this->processPost($activity, $source);
                    break;
                default:
                    // TRANS: Client exception.
                    throw new ClientException(_m('Cannot handle that kind of post.'));
                }
                break;
            case ActivityVerb::SHARE:
                $notice = $this->processShare($activity, $source);
                break;
            default:
                common_log(LOG_INFO, "Ignoring activity with unrecognized verb $activity->verb");
            }

            Event::handle('EndHandleFeedEntry', array($activity));
            Event::handle('EndHandleFeedEntryWithProfile', array($activity, $this, $notice));
        }

        return $notice;
    }

    public function processShare($activity, $method)
    {
        $notice = null;

        $oprofile = $this->checkAuthorship($activity);

        if (!$oprofile instanceof Ostatus_profile) {
            common_log(LOG_INFO, "No author matched share activity");
            return null;
        }

        // The id URI will be used as a unique identifier for the notice,
        // protecting against duplicate saves. It isn't required to be a URL;
        // tag: URIs for instance are found in Google Buzz feeds.
        $dupe = Notice::getKV('uri', $activity->id);
        if ($dupe instanceof Notice) {
            common_log(LOG_INFO, "OStatus: ignoring duplicate post: {$activity->id}");
            return $dupe;
        }

        if (count($activity->objects) != 1) {
            // TRANS: Client exception thrown when trying to share multiple activities at once.
            throw new ClientException(_m('Can only handle share activities with exactly one object.'));
        }

        $shared = $activity->objects[0];

        if (!$shared instanceof Activity) {
            // TRANS: Client exception thrown when trying to share a non-activity object.
            throw new ClientException(_m('Can only handle shared activities.'));
        }

        $sharedId = $shared->id;
        if (!empty($shared->objects[0]->id)) {
            // Because StatusNet since commit 8cc4660 sets $shared->id to a TagURI which
            // fucks up federation, because the URI is no longer recognised by the origin.
            // So we set it to the object ID if it exists, otherwise we trust $shared->id
            $sharedId = $shared->objects[0]->id;
        }
        if (empty($sharedId)) {
            throw new ClientException(_m('Shared activity does not have an id'));
        }

        // First check if we have the shared activity. This has to be done first, because
        // we can't use these functions to "ensureActivityObjectProfile" of a local user,
        // who might be the creator of the shared activity in question.
        $sharedNotice = Notice::getKV('uri', $sharedId);
        if (!$sharedNotice instanceof Notice) {
            // If no locally stored notice is found, process it!
            // TODO: Remember to check Deleted_notice!
            // TODO: If a post is shared that we can't retrieve - what to do?
            try {
                $other = self::ensureActivityObjectProfile($shared->actor);
                $sharedNotice = $other->processActivity($shared, $method);
                if (!$sharedNotice instanceof Notice) {
                    // And if we apparently can't get the shared notice, we'll abort the whole thing.
                    // TRANS: Client exception thrown when saving an activity share fails.
                    // TRANS: %s is a share ID.
                    throw new ClientException(sprintf(_m('Failed to save activity %s.'), $sharedId));
                }
            } catch (FeedSubException $e) {
                // Remote feed could not be found or verified, should we
                // transform this into an "RT @user Blah, blah, blah..."?
                common_log(LOG_INFO, __METHOD__ . ' got a ' . get_class($e) . ': ' . $e->getMessage());
                return null;
            }
        }

        // We'll want to save a web link to the original notice, if provided.

        $sourceUrl = null;
        if ($activity->link) {
            $sourceUrl = $activity->link;
        } else if ($activity->link) {
            $sourceUrl = $activity->link;
        } else if (preg_match('!^https?://!', $activity->id)) {
            $sourceUrl = $activity->id;
        }

        // Use summary as fallback for content

        if (!empty($activity->content)) {
            $sourceContent = $activity->content;
        } else if (!empty($activity->summary)) {
            $sourceContent = $activity->summary;
        } else if (!empty($activity->title)) {
            $sourceContent = $activity->title;
        } else {
            // @todo FIXME: Fetch from $sourceUrl?
            // TRANS: Client exception. %s is a source URI.
            throw new ClientException(sprintf(_m('No content for notice %s.'), $activity->id));
        }

        // Get (safe!) HTML and text versions of the content

        $rendered = $this->purify($sourceContent);
        $content = html_entity_decode(strip_tags($rendered), ENT_QUOTES, 'UTF-8');

        $shortened = common_shorten_links($content);

        // If it's too long, try using the summary, and make the
        // HTML an attachment.

        $attachment = null;

        if (Notice::contentTooLong($shortened)) {
            $attachment = $this->saveHTMLFile($activity->title, $rendered);
            $summary = html_entity_decode(strip_tags($activity->summary), ENT_QUOTES, 'UTF-8');
            if (empty($summary)) {
                $summary = $content;
            }
            $shortSummary = common_shorten_links($summary);
            if (Notice::contentTooLong($shortSummary)) {
                $url = common_shorten_url($sourceUrl);
                $shortSummary = substr($shortSummary,
                                       0,
                                       Notice::maxContent() - (mb_strlen($url) + 2));
                $content = $shortSummary . ' ' . $url;

                // We mark up the attachment link specially for the HTML output
                // so we can fold-out the full version inline.

                // @todo FIXME i18n: This tooltip will be saved with the site's default language
                // TRANS: Shown when a notice is longer than supported and/or when attachments are present. At runtime
                // TRANS: this will usually be replaced with localised text from StatusNet core messages.
                $showMoreText = _m('Show more');
                $attachUrl = common_local_url('attachment',
                                              array('attachment' => $attachment->id));
                $rendered = common_render_text($shortSummary) .
                            '<a href="' . htmlspecialchars($attachUrl) .'"'.
                            ' class="attachment more"' .
                            ' title="'. htmlspecialchars($showMoreText) . '">' .
                            '&#8230;' .
                            '</a>';
            }
        }

        $options = array('is_local' => Notice::REMOTE,
                         'url' => $sourceUrl,
                         'uri' => $activity->id,
                         'rendered' => $rendered,
                         'replies' => array(),
                         'groups' => array(),
                         'peopletags' => array(),
                         'tags' => array(),
                         'urls' => array(),
                         'repeat_of' => $sharedNotice->id,
                         'scope' => $sharedNotice->scope);

        // Check for optional attributes...

        if (!empty($activity->time)) {
            $options['created'] = common_sql_date($activity->time);
        }

        if ($activity->context) {
            // TODO: context->attention
            list($options['groups'], $options['replies'])
                = $this->filterAttention($oprofile, $activity->context->attention);

            // Maintain direct reply associations
            // @todo FIXME: What about conversation ID?
            if (!empty($activity->context->replyToID)) {
                $orig = Notice::getKV('uri',
                                          $activity->context->replyToID);
                if ($orig instanceof Notice) {
                    $options['reply_to'] = $orig->id;
                }
            }

            $location = $activity->context->location;
            if ($location) {
                $options['lat'] = $location->lat;
                $options['lon'] = $location->lon;
                if ($location->location_id) {
                    $options['location_ns'] = $location->location_ns;
                    $options['location_id'] = $location->location_id;
                }
            }
        }

        if ($this->isPeopletag()) {
            $options['peopletags'][] = $this->localPeopletag();
        }

        // Atom categories <-> hashtags
        foreach ($activity->categories as $cat) {
            if ($cat->term) {
                $term = common_canonical_tag($cat->term);
                if ($term) {
                    $options['tags'][] = $term;
                }
            }
        }

        // Atom enclosures -> attachment URLs
        foreach ($activity->enclosures as $href) {
            // @todo FIXME: Save these locally or....?
            $options['urls'][] = $href;
        }

        $notice = Notice::saveNew($oprofile->profile_id,
                                  $content,
                                  'ostatus',
                                  $options);

        return $notice;
    }

    /**
     * Process an incoming post activity from this remote feed.
     * @param Activity $activity
     * @param string $method 'push' or 'salmon'
     * @return mixed saved Notice or false
     * @todo FIXME: Break up this function, it's getting nasty long
     */
    public function processPost($activity, $method)
    {
        $notice = null;

        $oprofile = $this->checkAuthorship($activity);

        if (!$oprofile instanceof Ostatus_profile) {
            return null;
        }

        // It's not always an ActivityObject::NOTE, but... let's just say it is.

        $note = $activity->objects[0];

        // The id URI will be used as a unique identifier for the notice,
        // protecting against duplicate saves. It isn't required to be a URL;
        // tag: URIs for instance are found in Google Buzz feeds.
        $sourceUri = $note->id;
        $dupe = Notice::getKV('uri', $sourceUri);
        if ($dupe instanceof Notice) {
            common_log(LOG_INFO, "OStatus: ignoring duplicate post: $sourceUri");
            return $dupe;
        }

        // We'll also want to save a web link to the original notice, if provided.
        $sourceUrl = null;
        if ($note->link) {
            $sourceUrl = $note->link;
        } else if ($activity->link) {
            $sourceUrl = $activity->link;
        } else if (preg_match('!^https?://!', $note->id)) {
            $sourceUrl = $note->id;
        }

        // Use summary as fallback for content

        if (!empty($note->content)) {
            $sourceContent = $note->content;
        } else if (!empty($note->summary)) {
            $sourceContent = $note->summary;
        } else if (!empty($note->title)) {
            $sourceContent = $note->title;
        } else {
            // @todo FIXME: Fetch from $sourceUrl?
            // TRANS: Client exception. %s is a source URI.
            throw new ClientException(sprintf(_m('No content for notice %s.'),$sourceUri));
        }

        // Get (safe!) HTML and text versions of the content

        $rendered = $this->purify($sourceContent);
        $content = html_entity_decode(strip_tags($rendered), ENT_QUOTES, 'UTF-8');

        $shortened = common_shorten_links($content);

        // If it's too long, try using the summary, and make the
        // HTML an attachment.

        $attachment = null;

        if (Notice::contentTooLong($shortened)) {
            $attachment = $this->saveHTMLFile($note->title, $rendered);
            $summary = html_entity_decode(strip_tags($note->summary), ENT_QUOTES, 'UTF-8');
            if (empty($summary)) {
                $summary = $content;
            }
            $shortSummary = common_shorten_links($summary);
            if (Notice::contentTooLong($shortSummary)) {
                $url = common_shorten_url($sourceUrl);
                $shortSummary = substr($shortSummary,
                                       0,
                                       Notice::maxContent() - (mb_strlen($url) + 2));
                $content = $shortSummary . ' ' . $url;

                // We mark up the attachment link specially for the HTML output
                // so we can fold-out the full version inline.

                // @todo FIXME i18n: This tooltip will be saved with the site's default language
                // TRANS: Shown when a notice is longer than supported and/or when attachments are present. At runtime
                // TRANS: this will usually be replaced with localised text from StatusNet core messages.
                $showMoreText = _m('Show more');
                $attachUrl = common_local_url('attachment',
                                              array('attachment' => $attachment->id));
                $rendered = common_render_text($shortSummary) .
                            '<a href="' . htmlspecialchars($attachUrl) .'"'.
                            ' class="attachment more"' .
                            ' title="'. htmlspecialchars($showMoreText) . '">' .
                            '&#8230;' .
                            '</a>';
            }
        }

        $options = array('is_local' => Notice::REMOTE,
                        'url' => $sourceUrl,
                        'uri' => $sourceUri,
                        'rendered' => $rendered,
                        'replies' => array(),
                        'groups' => array(),
                        'peopletags' => array(),
                        'tags' => array(),
                        'urls' => array());

        // Check for optional attributes...

        if (!empty($activity->time)) {
            $options['created'] = common_sql_date($activity->time);
        }

        if ($activity->context) {
            // TODO: context->attention
            list($options['groups'], $options['replies'])
                = $this->filterAttention($oprofile, $activity->context->attention);

            // Maintain direct reply associations
            // @todo FIXME: What about conversation ID?
            if (!empty($activity->context->replyToID)) {
                $orig = Notice::getKV('uri', $activity->context->replyToID);
                if ($orig instanceof Notice) {
                    $options['reply_to'] = $orig->id;
                }
            }

            $location = $activity->context->location;
            if ($location) {
                $options['lat'] = $location->lat;
                $options['lon'] = $location->lon;
                if ($location->location_id) {
                    $options['location_ns'] = $location->location_ns;
                    $options['location_id'] = $location->location_id;
                }
            }
        }

        if ($this->isPeopletag()) {
            $options['peopletags'][] = $this->localPeopletag();
        }

        // Atom categories <-> hashtags
        foreach ($activity->categories as $cat) {
            if ($cat->term) {
                $term = common_canonical_tag($cat->term);
                if ($term) {
                    $options['tags'][] = $term;
                }
            }
        }

        // Atom enclosures -> attachment URLs
        foreach ($activity->enclosures as $href) {
            // @todo FIXME: Save these locally or....?
            $options['urls'][] = $href;
        }

        try {
            $saved = Notice::saveNew($oprofile->profile_id,
                                     $content,
                                     'ostatus',
                                     $options);
            if ($saved instanceof Notice) {
                Ostatus_source::saveNew($saved, $this, $method);
                if (!empty($attachment)) {
                    File_to_post::processNew($attachment->id, $saved->id);
                }
            }
        } catch (Exception $e) {
            common_log(LOG_ERR, "OStatus save of remote message $sourceUri failed: " . $e->getMessage());
            throw $e;
        }
        common_log(LOG_INFO, "OStatus saved remote message $sourceUri as notice id $saved->id");
        return $saved;
    }

    /**
     * Clean up HTML
     */
    protected function purify($html)
    {
        require_once INSTALLDIR.'/extlib/htmLawed/htmLawed.php';
        $config = array('safe' => 1,
                        'deny_attribute' => 'id,style,on*');
        return htmLawed($html, $config);
    }

    /**
     * Filters a list of recipient ID URIs to just those for local delivery.
     * @param Ostatus_profile local profile of sender
     * @param array in/out &$attention_uris set of URIs, will be pruned on output
     * @return array of group IDs
     */
    protected function filterAttention($sender, array $attention)
    {
        common_log(LOG_DEBUG, "Original reply recipients: " . implode(', ', array_keys($attention)));
        $groups = array();
        $replies = array();
        foreach ($attention as $recipient=>$type) {
            // Is the recipient a local user?
            $user = User::getKV('uri', $recipient);
            if ($user instanceof User) {
                // @todo FIXME: Sender verification, spam etc?
                $replies[] = $recipient;
                continue;
            }

            // Is the recipient a local group?
            // TODO: $group = User_group::getKV('uri', $recipient);
            $id = OStatusPlugin::localGroupFromUrl($recipient);
            if ($id) {
                $group = User_group::getKV('id', $id);
                if ($group instanceof User_group) {
                    try {
                        // Deliver to all members of this local group if allowed.
                        $profile = $sender->localProfile();
                        if ($profile->isMember($group)) {
                            $groups[] = $group->id;
                        } else {
                            common_log(LOG_DEBUG, "Skipping reply to local group $group->nickname as sender $profile->id is not a member");
                        }
                    } catch (NoProfileException $e) {
                        // Sender has no profile! Do some garbage collection, please.
                    }
                    continue;
                } else {
                    common_log(LOG_DEBUG, "Skipping reply to bogus group $recipient");
                }
            }

            // Is the recipient a remote user or group?
            try {
                $oprofile = self::ensureProfileURI($recipient);
                if ($oprofile->isGroup()) {
                    // Deliver to local members of this remote group.
                    // @todo FIXME: Sender verification?
                    $groups[] = $oprofile->group_id;
                } else {
                    // may be canonicalized or something
                    $replies[] = $oprofile->getUri();
                }
                continue;
            } catch (Exception $e) {
                // Neither a recognizable local nor remote user!
                common_log(LOG_DEBUG, "Skipping reply to unrecognized profile $recipient: " . $e->getMessage());
            }

        }
        common_log(LOG_DEBUG, "Local reply recipients: " . implode(', ', $replies));
        common_log(LOG_DEBUG, "Local group recipients: " . implode(', ', $groups));
        return array($groups, $replies);
    }

    /**
     * Look up and if necessary create an Ostatus_profile for the remote entity
     * with the given profile page URL. This should never return null -- you
     * will either get an object or an exception will be thrown.
     *
     * @param string $profile_url
     * @return Ostatus_profile
     * @throws Exception on various error conditions
     * @throws OStatusShadowException if this reference would obscure a local user/group
     */
    public static function ensureProfileURL($profile_url, $hints=array())
    {
        $oprofile = self::getFromProfileURL($profile_url);

        if ($oprofile instanceof Ostatus_profile) {
            return $oprofile;
        }

        $hints['profileurl'] = $profile_url;

        // Fetch the URL
        // XXX: HTTP caching

        $client = new HTTPClient();
        $client->setHeader('Accept', 'text/html,application/xhtml+xml');
        $response = $client->get($profile_url);

        if (!$response->isOk()) {
            // TRANS: Exception. %s is a profile URL.
            throw new Exception(sprintf(_m('Could not reach profile page %s.'),$profile_url));
        }

        // Check if we have a non-canonical URL

        $finalUrl = $response->getUrl();

        if ($finalUrl != $profile_url) {

            $hints['profileurl'] = $finalUrl;

            $oprofile = self::getFromProfileURL($finalUrl);

            if ($oprofile instanceof Ostatus_profile) {
                return $oprofile;
            }
        }

        // Try to get some hCard data

        $body = $response->getBody();

        $hcardHints = DiscoveryHints::hcardHints($body, $finalUrl);

        if (!empty($hcardHints)) {
            $hints = array_merge($hints, $hcardHints);
        }

        // Check if they've got an LRDD header

        $lrdd = LinkHeader::getLink($response, 'lrdd');
        try {
            $xrd = new XML_XRD();
            $xrd->loadFile($lrdd);
            $xrdHints = DiscoveryHints::fromXRD($xrd);
            $hints = array_merge($hints, $xrdHints);
        } catch (Exception $e) {
            // No hints available from XRD
        }

        // If discovery found a feedurl (probably from LRDD), use it.

        if (array_key_exists('feedurl', $hints)) {
            return self::ensureFeedURL($hints['feedurl'], $hints);
        }

        // Get the feed URL from HTML

        $discover = new FeedDiscovery();

        $feedurl = $discover->discoverFromHTML($finalUrl, $body);

        if (!empty($feedurl)) {
            $hints['feedurl'] = $feedurl;
            return self::ensureFeedURL($feedurl, $hints);
        }

        // TRANS: Exception. %s is a URL.
        throw new Exception(sprintf(_m('Could not find a feed URL for profile page %s.'),$finalUrl));
    }

    /**
     * Look up the Ostatus_profile, if present, for a remote entity with the
     * given profile page URL. Will return null for both unknown and invalid
     * remote profiles.
     *
     * @return mixed Ostatus_profile or null
     * @throws OStatusShadowException for local profiles
     */
    static function getFromProfileURL($profile_url)
    {
        $profile = Profile::getKV('profileurl', $profile_url);
        if (!$profile instanceof Profile) {
            return null;
        }

        // Is it a known Ostatus profile?
        $oprofile = Ostatus_profile::getKV('profile_id', $profile->id);
        if ($oprofile instanceof Ostatus_profile) {
            return $oprofile;
        }

        // Is it a local user?
        $user = User::getKV('id', $profile->id);
        if ($user instanceof User) {
            // @todo i18n FIXME: use sprintf and add i18n (?)
            throw new OStatusShadowException($profile, "'$profile_url' is the profile for local user '{$user->nickname}'.");
        }

        // Continue discovery; it's a remote profile
        // for OMB or some other protocol, may also
        // support OStatus

        return null;
    }

    /**
     * Look up and if necessary create an Ostatus_profile for remote entity
     * with the given update feed. This should never return null -- you will
     * either get an object or an exception will be thrown.
     *
     * @return Ostatus_profile
     * @throws Exception
     */
    public static function ensureFeedURL($feed_url, $hints=array())
    {
        $discover = new FeedDiscovery();

        $feeduri = $discover->discoverFromFeedURL($feed_url);
        $hints['feedurl'] = $feeduri;

        $huburi = $discover->getHubLink();
        $hints['hub'] = $huburi;

        // XXX: NS_REPLIES is deprecated anyway, so let's remove it in the future.
        $salmonuri = $discover->getAtomLink(Salmon::REL_SALMON)
                        ?: $discover->getAtomLink(Salmon::NS_REPLIES);
        $hints['salmon'] = $salmonuri;

        if (!$huburi && !common_config('feedsub', 'fallback_hub')) {
            // We can only deal with folks with a PuSH hub
            throw new FeedSubNoHubException();
        }

        $feedEl = $discover->root;

        if ($feedEl->tagName == 'feed') {
            return self::ensureAtomFeed($feedEl, $hints);
        } else if ($feedEl->tagName == 'channel') {
            return self::ensureRssChannel($feedEl, $hints);
        } else {
            throw new FeedSubBadXmlException($feeduri);
        }
    }

    /**
     * Look up and, if necessary, create an Ostatus_profile for the remote
     * profile with the given Atom feed - actually loaded from the feed.
     * This should never return null -- you will either get an object or
     * an exception will be thrown.
     *
     * @param DOMElement $feedEl root element of a loaded Atom feed
     * @param array $hints additional discovery information passed from higher levels
     * @todo FIXME: Should this be marked public?
     * @return Ostatus_profile
     * @throws Exception
     */
    public static function ensureAtomFeed($feedEl, $hints)
    {
        $author = ActivityUtils::getFeedAuthor($feedEl);

        if (empty($author)) {
            // XXX: make some educated guesses here
            // TRANS: Feed sub exception.
            throw new FeedSubException(_m('Cannot find enough profile '.
                                          'information to make a feed.'));
        }

        return self::ensureActivityObjectProfile($author, $hints);
    }

    /**
     * Look up and, if necessary, create an Ostatus_profile for the remote
     * profile with the given RSS feed - actually loaded from the feed.
     * This should never return null -- you will either get an object or
     * an exception will be thrown.
     *
     * @param DOMElement $feedEl root element of a loaded RSS feed
     * @param array $hints additional discovery information passed from higher levels
     * @todo FIXME: Should this be marked public?
     * @return Ostatus_profile
     * @throws Exception
     */
    public static function ensureRssChannel($feedEl, $hints)
    {
        // Special-case for Posterous. They have some nice metadata in their
        // posterous:author elements. We should use them instead of the channel.

        $items = $feedEl->getElementsByTagName('item');

        if ($items->length > 0) {
            $item = $items->item(0);
            $authorEl = ActivityUtils::child($item, ActivityObject::AUTHOR, ActivityObject::POSTEROUS);
            if (!empty($authorEl)) {
                $obj = ActivityObject::fromPosterousAuthor($authorEl);
                // Posterous has multiple authors per feed, and multiple feeds
                // per author. We check if this is the "main" feed for this author.
                if (array_key_exists('profileurl', $hints) &&
                    !empty($obj->poco) &&
                    common_url_to_nickname($hints['profileurl']) == $obj->poco->preferredUsername) {
                    return self::ensureActivityObjectProfile($obj, $hints);
                }
            }
        }

        // @todo FIXME: We should check whether this feed has elements
        // with different <author> or <dc:creator> elements, and... I dunno.
        // Do something about that.

        $obj = ActivityObject::fromRssChannel($feedEl);

        return self::ensureActivityObjectProfile($obj, $hints);
    }

    /**
     * Download and update given avatar image
     *
     * @param string $url
     * @throws Exception in various failure cases
     */
    protected function updateAvatar($url)
    {
        if ($url == $this->avatar) {
            // We've already got this one.
            return;
        }
        if (!common_valid_http_url($url)) {
            // TRANS: Server exception. %s is a URL.
            throw new ServerException(sprintf(_m('Invalid avatar URL %s.'), $url));
        }

        if ($this->isGroup()) {
            // FIXME: throw exception for localGroup
            $self = $this->localGroup();
        } else {
            // this throws an exception already
            $self = $this->localProfile();
        }
        if (!$self) {
            throw new ServerException(sprintf(
                // TRANS: Server exception. %s is a URI.
                _m('Tried to update avatar for unsaved remote profile %s.'),
                $this->getUri()));
        }

        // @todo FIXME: This should be better encapsulated
        // ripped from oauthstore.php (for old OMB client)
        $temp_filename = tempnam(sys_get_temp_dir(), 'listener_avatar');
        try {
            if (!copy($url, $temp_filename)) {
                // TRANS: Server exception. %s is a URL.
                throw new ServerException(sprintf(_m('Unable to fetch avatar from %s.'), $url));
            }

            if ($this->isGroup()) {
                $id = $this->group_id;
            } else {
                $id = $this->profile_id;
            }
            // @todo FIXME: Should we be using different ids?
            $imagefile = new ImageFile($id, $temp_filename);
            $filename = Avatar::filename($id,
                                         image_type_to_extension($imagefile->type),
                                         null,
                                         common_timestamp());
            rename($temp_filename, Avatar::path($filename));
        } catch (Exception $e) {
            unlink($temp_filename);
            throw $e;
        }
        // @todo FIXME: Hardcoded chmod is lame, but seems to be necessary to
        // keep from accidentally saving images from command-line (queues)
        // that can't be read from web server, which causes hard-to-notice
        // problems later on:
        //
        // http://status.net/open-source/issues/2663
        chmod(Avatar::path($filename), 0644);

        $self->setOriginal($filename);

        $orig = clone($this);
        $this->avatar = $url;
        $this->update($orig);
    }

    /**
     * Pull avatar URL from ActivityObject or profile hints
     *
     * @param ActivityObject $object
     * @param array $hints
     * @return mixed URL string or false
     */
    public static function getActivityObjectAvatar($object, $hints=array())
    {
        if ($object->avatarLinks) {
            $best = false;
            // Take the exact-size avatar, or the largest avatar, or the first avatar if all sizeless
            foreach ($object->avatarLinks as $avatar) {
                if ($avatar->width == AVATAR_PROFILE_SIZE && $avatar->height = AVATAR_PROFILE_SIZE) {
                    // Exact match!
                    $best = $avatar;
                    break;
                }
                if (!$best || $avatar->width > $best->width) {
                    $best = $avatar;
                }
            }
            return $best->url;
        } else if (array_key_exists('avatar', $hints)) {
            return $hints['avatar'];
        }
        return false;
    }

    /**
     * Get an appropriate avatar image source URL, if available.
     *
     * @param ActivityObject $actor
     * @param D…