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-rw-r--r--plugins/OStatus/lib/feedmunger.php316
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diff --git a/plugins/OStatus/lib/feedmunger.php b/plugins/OStatus/lib/feedmunger.php
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+<?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 FeedSubPreviewNotice extends Notice
+{
+ protected $fetched = true;
+
+ function __construct($profile)
+ {
+ $this->profile = $profile;
+ $this->profile_id = 0;
+ }
+
+ function getProfile()
+ {
+ return $this->profile;
+ }
+
+ function find()
+ {
+ return true;
+ }
+
+ function fetch()
+ {
+ $got = $this->fetched;
+ $this->fetched = false;
+ return $got;
+ }
+}
+
+class FeedSubPreviewProfile extends Profile
+{
+ function getAvatar($width, $height=null)
+ {
+ return new FeedSubPreviewAvatar($width, $height, $this->avatar);
+ }
+}
+
+class FeedSubPreviewAvatar extends Avatar
+{
+ function __construct($width, $height, $remote)
+ {
+ $this->remoteImage = $remote;
+ }
+
+ function displayUrl() {
+ return $this->remoteImage;
+ }
+}
+
+class FeedMunger
+{
+ /**
+ * @param XML_Feed_Parser $feed
+ */
+ function __construct($feed, $url=null)
+ {
+ $this->feed = $feed;
+ $this->url = $url;
+ }
+
+ function feedinfo()
+ {
+ $feedinfo = new Feedinfo();
+ $feedinfo->feeduri = $this->url;
+ $feedinfo->homeuri = $this->feed->link;
+ $feedinfo->huburi = $this->getHubLink();
+ return $feedinfo;
+ }
+
+ function getAtomLink($item, $attribs=array())
+ {
+ // XML_Feed_Parser gets confused by multiple <link> elements.
+ $dom = $item->model;
+
+ // Note that RSS feeds would embed an <atom:link> so this should work for both.
+ /// http://code.google.com/p/pubsubhubbub/wiki/RssFeeds
+ // <link rel='hub' href='http://pubsubhubbub.appspot.com/'/>
+ $links = $dom->getElementsByTagNameNS('http://www.w3.org/2005/Atom', 'link');
+ for ($i = 0; $i < $links->length; $i++) {
+ $node = $links->item($i);
+ if ($node->hasAttributes()) {
+ $href = $node->attributes->getNamedItem('href');
+ if ($href) {
+ $matches = 0;
+ foreach ($attribs as $name => $val) {
+ $attrib = $node->attributes->getNamedItem($name);
+ if ($attrib && $attrib->value == $val) {
+ $matches++;
+ }
+ }
+ if ($matches == count($attribs)) {
+ return $href->value;
+ }
+ }
+ }
+ }
+ return false;
+ }
+
+ function getRssLink($item)
+ {
+ // XML_Feed_Parser gets confused by multiple <link> elements.
+ $dom = $item->model;
+
+ // Note that RSS feeds would embed an <atom:link> so this should work for both.
+ /// http://code.google.com/p/pubsubhubbub/wiki/RssFeeds
+ // <link rel='hub' href='http://pubsubhubbub.appspot.com/'/>
+ $links = $dom->getElementsByTagName('link');
+ for ($i = 0; $i < $links->length; $i++) {
+ $node = $links->item($i);
+ if (!$node->hasAttributes()) {
+ return $node->textContent;
+ }
+ }
+ return false;
+ }
+
+ function getAltLink($item)
+ {
+ // Check for an atom link...
+ $link = $this->getAtomLink($item, array('rel' => 'alternate', 'type' => 'text/html'));
+ if (!$link) {
+ $link = $this->getRssLink($item);
+ }
+ return $link;
+ }
+
+ function getHubLink()
+ {
+ return $this->getAtomLink($this->feed, array('rel' => 'hub'));
+ }
+
+ /**
+ * Get an appropriate avatar image source URL, if available.
+ * @return mixed string or false
+ */
+ function getAvatar()
+ {
+ $logo = $this->feed->logo;
+ if ($logo) {
+ return $logo;
+ }
+ $icon = $this->feed->icon;
+ if ($icon) {
+ return $icon;
+ }
+ return common_path('plugins/OStatus/images/48px-Feed-icon.svg.png');
+ }
+
+ function profile($preview=false)
+ {
+ if ($preview) {
+ $profile = new FeedSubPreviewProfile();
+ } else {
+ $profile = new Profile();
+ }
+
+ // @todo validate/normalize nick?
+ $profile->nickname = $this->feed->title;
+ $profile->fullname = $this->feed->title;
+ $profile->homepage = $this->getAltLink($this->feed);
+ $profile->bio = $this->feed->description;
+ $profile->profileurl = $this->getAltLink($this->feed);
+
+ if ($preview) {
+ $profile->avatar = $this->getAvatar();
+ }
+
+ // @todo tags from categories
+ // @todo lat/lon/location?
+
+ return $profile;
+ }
+
+ function notice($index=1, $preview=false)
+ {
+ $entry = $this->feed->getEntryByOffset($index);
+ if (!$entry) {
+ return null;
+ }
+
+ if ($preview) {
+ $notice = new FeedSubPreviewNotice($this->profile(true));
+ $notice->id = -1;
+ } else {
+ $notice = new Notice();
+ }
+
+ $link = $this->getAltLink($entry);
+ if (empty($link)) {
+ if (preg_match('!^https?://!', $entry->id)) {
+ $link = $entry->id;
+ common_log(LOG_DEBUG, "No link on entry, using URL from id: $link");
+ }
+ }
+ $notice->uri = $link;
+ $notice->url = $link;
+ $notice->content = $this->noticeFromEntry($entry);
+ $notice->rendered = common_render_content($notice->content, $notice);
+ $notice->created = common_sql_date($entry->updated); // @fixme
+ $notice->is_local = Notice::GATEWAY;
+ $notice->source = 'feed';
+
+ $location = $this->getLocation($entry);
+ if ($location) {
+ if ($location->location_id) {
+ $notice->location_ns = $location->location_ns;
+ $notice->location_id = $location->location_id;
+ }
+ $notice->lat = $location->lat;
+ $notice->lon = $location->lon;
+ }
+
+ return $notice;
+ }
+
+ /**
+ * @param feed item $entry
+ * @return mixed Location or false
+ */
+ function getLocation($entry)
+ {
+ $dom = $entry->model;
+ $points = $dom->getElementsByTagNameNS('http://www.georss.org/georss', 'point');
+
+ for ($i = 0; $i < $points->length; $i++) {
+ $point = trim($points->item(0)->textContent);
+ $coords = explode(' ', $point);
+ if (count($coords) == 2) {
+ list($lat, $lon) = $coords;
+ if (is_numeric($lat) && is_numeric($lon)) {
+ common_log(LOG_INFO, "Looking up location for $lat $lon from georss");
+ return Location::fromLatLon($lat, $lon);
+ }
+ }
+ common_log(LOG_ERR, "Ignoring bogus georss:point value $point");
+ }
+
+ return false;
+ }
+
+ /**
+ * @param XML_Feed_Type $entry
+ * @return string notice text, within post size limit
+ */
+ function noticeFromEntry($entry)
+ {
+ $max = Notice::maxContent();
+ $ellipsis = "\xe2\x80\xa6"; // U+2026 HORIZONTAL ELLIPSIS
+ $title = $entry->title;
+ $link = $entry->link;
+
+ // @todo We can get <category> entries like this:
+ // $cats = $entry->getCategory('category', array(0, true));
+ // but it feels like an awful hack. If it's accessible cleanly,
+ // try adding #hashtags from the categories/tags on a post.
+
+ $title = $entry->title;
+ $link = $this->getAltLink($entry);
+ if ($link) {
+ // Blog post or such...
+ // @todo Should we force a language here?
+ $format = _m('New post: "%1$s" %2$s');
+ $out = sprintf($format, $title, $link);
+
+ // Trim link if needed...
+ if (mb_strlen($out) > $max) {
+ $link = common_shorten_url($link);
+ $out = sprintf($format, $title, $link);
+ }
+
+ // Trim title if needed...
+ if (mb_strlen($out) > $max) {
+ $used = mb_strlen($out) - mb_strlen($title);
+ $available = $max - $used - mb_strlen($ellipsis);
+ $title = mb_substr($title, 0, $available) . $ellipsis;
+ $out = sprintf($format, $title, $link);
+ }
+ } else {
+ // No link? Consider a bare status update.
+ if (mb_strlen($title) > $max) {
+ $available = $max - mb_strlen($ellipsis);
+ $out = mb_substr($title, 0, $available) . $ellipsis;
+ } else {
+ $out = $title;
+ }
+ }
+
+ return $out;
+ }
+}
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