Merge branch '0.9.x' of git://gitorious.org/statusnet/mainline into 0.9.x

1 files changed, 1216 insertions, 0 deletions

diff --git a/lib/api.php b/lib/api.php
new file mode 100644
index 000000000..7a63a4a78
--- /dev/null
+++ b/lib/api.php
@@ -0,0 +1,1216 @@
+<?php
+/**
+ * StatusNet, the distributed open-source microblogging tool
+ *
+ * Base API action
+ *
+ * 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  API
+ * @package   StatusNet
+ * @author    Craig Andrews <candrews@integralblue.com>
+ * @author    Dan Moore <dan@moore.cx>
+ * @author    Evan Prodromou <evan@status.net>
+ * @author    Jeffery To <jeffery.to@gmail.com>
+ * @author    Toby Inkster <mail@tobyinkster.co.uk>
+ * @author    Zach Copley <zach@status.net>
+ * @copyright 2009 StatusNet, Inc.
+ * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link      http://status.net/
+ */
+
+if (!defined('STATUSNET')) {
+    exit(1);
+}
+
+/**
+ * Contains most of the Twitter-compatible API output functions.
+ *
+ * @category API
+ * @package  StatusNet
+ * @author   Craig Andrews <candrews@integralblue.com>
+ * @author   Dan Moore <dan@moore.cx>
+ * @author   Evan Prodromou <evan@status.net>
+ * @author   Jeffery To <jeffery.to@gmail.com>
+ * @author   Toby Inkster <mail@tobyinkster.co.uk>
+ * @author   Zach Copley <zach@status.net>
+ * @license  http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link     http://status.net/
+ */
+
+class ApiAction extends Action
+{
+     var $format   = null;
+     var $user     = null;
+     var $page     = null;
+     var $count    = null;
+     var $max_id   = null;
+     var $since_id = null;
+     var $since    = null;
+     
+    /**
+     * Initialization.
+     *
+     * @param array $args Web and URL arguments
+     *
+     * @return boolean false if user doesn't exist
+     */
+
+    function prepare($args)
+    {
+        parent::prepare($args);
+        
+        $this->format   = $this->arg('format');
+        $this->page     = (int)$this->arg('page', 1);
+        $this->count    = (int)$this->arg('count', 20);
+        $this->max_id   = (int)$this->arg('max_id', 0);
+        $this->since_id = (int)$this->arg('since_id', 0);
+        $this->since    = $this->arg('since');
+        
+        return true;
+    }
+
+    /**
+     * Handle a request
+     *
+     * @param array $args Arguments from $_REQUEST
+     *
+     * @return void
+     */
+
+    function handle($args)
+    {
+        parent::handle($args);
+    }
+
+    /**
+     * Overrides XMLOutputter::element to write booleans as strings (true|false).
+     * See that method's documentation for more info.
+     *
+     * @param string $tag     Element type or tagname
+     * @param array  $attrs   Array of element attributes, as
+     *                        key-value pairs
+     * @param string $content string content of the element
+     *
+     * @return void
+     */
+    function element($tag, $attrs=null, $content=null)
+    {
+        if (is_bool($content)) {
+            $content = ($content ? 'true' : 'false');
+        }
+
+        return parent::element($tag, $attrs, $content);
+    }
+
+    function twitterUserArray($profile, $get_notice=false)
+    {
+        $twitter_user = array();
+
+        $twitter_user['id'] = intval($profile->id);
+        $twitter_user['name'] = $profile->getBestName();
+        $twitter_user['screen_name'] = $profile->nickname;
+        $twitter_user['location'] = ($profile->location) ? $profile->location : null;
+        $twitter_user['description'] = ($profile->bio) ? $profile->bio : null;
+
+        $avatar = $profile->getAvatar(AVATAR_STREAM_SIZE);
+        $twitter_user['profile_image_url'] = ($avatar) ? $avatar->displayUrl() :
+            Avatar::defaultImage(AVATAR_STREAM_SIZE);
+
+        $twitter_user['url'] = ($profile->homepage) ? $profile->homepage : null;
+        $twitter_user['protected'] = false; # not supported by StatusNet yet
+        $twitter_user['followers_count'] = $profile->subscriberCount();
+
+        // To be supported soon...
+        $twitter_user['profile_background_color'] = '';
+        $twitter_user['profile_text_color'] = '';
+        $twitter_user['profile_link_color'] = '';
+        $twitter_user['profile_sidebar_fill_color'] = '';
+        $twitter_user['profile_sidebar_border_color'] = '';
+
+        $twitter_user['friends_count'] = $profile->subscriptionCount();
+
+        $twitter_user['created_at'] = $this->dateTwitter($profile->created);
+
+        $twitter_user['favourites_count'] = $profile->faveCount(); // British spelling!
+
+        // Need to pull up the user for some of this
+        $user = User::staticGet($profile->id);
+
+        $timezone = 'UTC';
+
+        if ($user->timezone) {
+            $timezone = $user->timezone;
+        }
+
+        $t = new DateTime;
+        $t->setTimezone(new DateTimeZone($timezone));
+
+        $twitter_user['utc_offset'] = $t->format('Z');
+        $twitter_user['time_zone'] = $timezone;
+
+        // To be supported some day, perhaps
+        $twitter_user['profile_background_image_url'] = '';
+        $twitter_user['profile_background_tile'] = false;
+
+        $twitter_user['statuses_count'] = $profile->noticeCount();
+
+        // Is the requesting user following this user?
+        $twitter_user['following'] = false;
+        $twitter_user['notifications'] = false;
+
+        if (isset($apidata['user'])) {
+
+            $twitter_user['following'] = $apidata['user']->isSubscribed($profile);
+
+            // Notifications on?
+            $sub = Subscription::pkeyGet(array('subscriber' =>
+                $apidata['user']->id, 'subscribed' => $profile->id));
+
+            if ($sub) {
+                $twitter_user['notifications'] = ($sub->jabber || $sub->sms);
+            }
+        }
+
+        if ($get_notice) {
+            $notice = $profile->getCurrentNotice();
+            if ($notice) {
+                # don't get user!
+                $twitter_user['status'] = $this->twitterStatusArray($notice, false);
+            }
+        }
+
+        return $twitter_user;
+    }
+
+    function twitterStatusArray($notice, $include_user=true)
+    {
+        $profile = $notice->getProfile();
+
+        $twitter_status = array();
+        $twitter_status['text'] = $notice->content;
+        $twitter_status['truncated'] = false; # Not possible on StatusNet
+        $twitter_status['created_at'] = $this->dateTwitter($notice->created);
+        $twitter_status['in_reply_to_status_id'] = ($notice->reply_to) ?
+            intval($notice->reply_to) : null;
+        $twitter_status['source'] = $this->sourceLink($notice->source);
+        $twitter_status['id'] = intval($notice->id);
+
+        $replier_profile = null;
+
+        if ($notice->reply_to) {
+            $reply = Notice::staticGet(intval($notice->reply_to));
+            if ($reply) {
+                $replier_profile = $reply->getProfile();
+            }
+        }
+
+        $twitter_status['in_reply_to_user_id'] =
+            ($replier_profile) ? intval($replier_profile->id) : null;
+        $twitter_status['in_reply_to_screen_name'] =
+            ($replier_profile) ? $replier_profile->nickname : null;
+
+        if (isset($this->auth_user)) {
+            $twitter_status['favorited'] = $this->auth_user->hasFave($notice);
+        } else {
+            $twitter_status['favorited'] = false;
+        }
+
+        // Enclosures
+        $attachments = $notice->attachments();
+
+        if (!empty($attachments)) {
+
+            $twitter_status['attachments'] = array();
+
+            foreach ($attachments as $attachment) {
+                if ($attachment->isEnclosure()) {
+                    $enclosure = array();
+                    $enclosure['url'] = $attachment->url;
+                    $enclosure['mimetype'] = $attachment->mimetype;
+                    $enclosure['size'] = $attachment->size;
+                    $twitter_status['attachments'][] = $enclosure;
+                }
+            }
+        }
+
+        if ($include_user) {
+            # Don't get notice (recursive!)
+            $twitter_user = $this->twitterUserArray($profile, false);
+            $twitter_status['user'] = $twitter_user;
+        }
+
+        return $twitter_status;
+    }
+
+    function twitterGroupArray($group)
+    {
+        $twitter_group=array();
+        $twitter_group['id']=$group->id;
+        $twitter_group['url']=$group->permalink();
+        $twitter_group['nickname']=$group->nickname;
+        $twitter_group['fullname']=$group->fullname;
+        $twitter_group['homepage_url']=$group->homepage_url;
+        $twitter_group['original_logo']=$group->original_logo;
+        $twitter_group['homepage_logo']=$group->homepage_logo;
+        $twitter_group['stream_logo']=$group->stream_logo;
+        $twitter_group['mini_logo']=$group->mini_logo;
+        $twitter_group['homepage']=$group->homepage;
+        $twitter_group['description']=$group->description;
+        $twitter_group['location']=$group->location;
+        $twitter_group['created']=$this->dateTwitter($group->created);
+        $twitter_group['modified']=$this->dateTwitter($group->modified);
+        return $twitter_group;
+    }
+
+    function twitterRssGroupArray($group)
+    {
+        $entry = array();
+        $entry['content']=$group->description;
+        $entry['title']=$group->nickname;
+        $entry['link']=$group->permalink();
+        $entry['published']=common_date_iso8601($group->created);
+        $entry['updated']==common_date_iso8601($group->modified);
+        $taguribase = common_config('integration', 'groupuri');
+        $entry['id'] = "group:$groupuribase:$entry[link]";
+
+        $entry['description'] = $entry['content'];
+        $entry['pubDate'] = common_date_rfc2822($group->created);
+        $entry['guid'] = $entry['link'];
+
+        return $entry;
+    }
+
+    function twitterRssEntryArray($notice)
+    {
+        $profile = $notice->getProfile();
+        $entry = array();
+
+        // We trim() to avoid extraneous whitespace in the output
+
+        $entry['content'] = common_xml_safe_str(trim($notice->rendered));
+        $entry['title'] = $profile->nickname . ': ' . common_xml_safe_str(trim($notice->content));
+        $entry['link'] = common_local_url('shownotice', array('notice' => $notice->id));
+        $entry['published'] = common_date_iso8601($notice->created);
+
+        $taguribase = common_config('integration', 'taguri');
+        $entry['id'] = "tag:$taguribase:$entry[link]";
+
+        $entry['updated'] = $entry['published'];
+        $entry['author'] = $profile->getBestName();
+
+        // Enclosures
+        $attachments = $notice->attachments();
+        $enclosures = array();
+
+        foreach ($attachments as $attachment) {
+            $enclosure_o=$attachment->getEnclosure();
+            if ($enclosure_o) {
+                 $enclosure = array();
+                 $enclosure['url'] = $enclosure_o->url;
+                 $enclosure['mimetype'] = $enclosure_o->mimetype;
+                 $enclosure['size'] = $enclosure_o->size;
+                 $enclosures[] = $enclosure;
+            }
+        }
+
+        if (!empty($enclosures)) {
+            $entry['enclosures'] = $enclosures;
+        }
+
+        // Tags/Categories
+        $tag = new Notice_tag();
+        $tag->notice_id = $notice->id;
+        if ($tag->find()) {
+            $entry['tags']=array();
+            while ($tag->fetch()) {
+                $entry['tags'][]=$tag->tag;
+            }
+        }
+        $tag->free();
+
+        // RSS Item specific
+        $entry['description'] = $entry['content'];
+        $entry['pubDate'] = common_date_rfc2822($notice->created);
+        $entry['guid'] = $entry['link'];
+
+        return $entry;
+    }
+
+
+    function twitterRelationshipArray($source, $target)
+    {
+        $relationship = array();
+
+        $relationship['source'] =
+            $this->relationshipDetailsArray($source, $target);
+        $relationship['target'] =
+            $this->relationshipDetailsArray($target, $source);
+
+        return array('relationship' => $relationship);
+    }
+
+    function relationshipDetailsArray($source, $target)
+    {
+        $details = array();
+
+        $details['screen_name'] = $source->nickname;
+        $details['followed_by'] = $target->isSubscribed($source);
+        $details['following'] = $source->isSubscribed($target);
+
+        $notifications = false;
+
+        if ($source->isSubscribed($target)) {
+
+            $sub = Subscription::pkeyGet(array('subscriber' =>
+                $source->id, 'subscribed' => $target->id));
+
+            if (!empty($sub)) {
+                $notifications = ($sub->jabber || $sub->sms);
+            }
+        }
+
+        $details['notifications_enabled'] = $notifications;
+        $details['blocking'] = $source->hasBlocked($target);
+        $details['id'] = $source->id;
+
+        return $details;
+    }
+
+    function showTwitterXmlRelationship($relationship)
+    {
+        $this->elementStart('relationship');
+
+        foreach($relationship as $element => $value) {
+            if ($element == 'source' || $element == 'target') {
+                $this->elementStart($element);
+                $this->showXmlRelationshipDetails($value);
+                $this->elementEnd($element);
+            }
+        }
+
+        $this->elementEnd('relationship');
+    }
+
+    function showXmlRelationshipDetails($details)
+    {
+        foreach($details as $element => $value) {
+            $this->element($element, null, $value);
+        }
+    }
+
+    function showTwitterXmlStatus($twitter_status)
+    {
+        $this->elementStart('status');
+        foreach($twitter_status as $element => $value) {
+            switch ($element) {
+            case 'user':
+                $this->showTwitterXmlUser($twitter_status['user']);
+                break;
+            case 'text':
+                $this->element($element, null, common_xml_safe_str($value));
+                break;
+            case 'attachments':
+                $this->showXmlAttachments($twitter_status['attachments']);
+                break;
+            default:
+                $this->element($element, null, $value);
+            }
+        }
+        $this->elementEnd('status');
+    }
+
+    function showTwitterXmlGroup($twitter_group)
+    {
+        $this->elementStart('group');
+        foreach($twitter_group as $element => $value) {
+            $this->element($element, null, $value);
+        }
+        $this->elementEnd('group');
+    }
+
+    function showTwitterXmlUser($twitter_user, $role='user')
+    {
+        $this->elementStart($role);
+        foreach($twitter_user as $element => $value) {
+            if ($element == 'status') {
+                $this->showTwitterXmlStatus($twitter_user['status']);
+            } else {
+                $this->element($element, null, $value);
+            }
+        }
+        $this->elementEnd($role);
+    }
+
+    function showXmlAttachments($attachments) {
+        if (!empty($attachments)) {
+            $this->elementStart('attachments', array('type' => 'array'));
+            foreach ($attachments as $attachment) {
+                $attrs = array();
+                $attrs['url'] = $attachment['url'];
+                $attrs['mimetype'] = $attachment['mimetype'];
+                $attrs['size'] = $attachment['size'];
+                $this->element('enclosure', $attrs, '');
+            }
+            $this->elementEnd('attachments');
+        }
+    }
+
+    function showTwitterRssItem($entry)
+    {
+        $this->elementStart('item');
+        $this->element('title', null, $entry['title']);
+        $this->element('description', null, $entry['description']);
+        $this->element('pubDate', null, $entry['pubDate']);
+        $this->element('guid', null, $entry['guid']);
+        $this->element('link', null, $entry['link']);
+
+        # RSS only supports 1 enclosure per item
+        if(array_key_exists('enclosures', $entry) and !empty($entry['enclosures'])){
+            $enclosure = $entry['enclosures'][0];
+            $this->element('enclosure', array('url'=>$enclosure['url'],'type'=>$enclosure['mimetype'],'length'=>$enclosure['size']), null);
+        }
+
+        if(array_key_exists('tags', $entry)){
+            foreach($entry['tags'] as $tag){
+                $this->element('category', null,$tag);
+            }
+        }
+
+        $this->elementEnd('item');
+    }
+
+    function showJsonObjects($objects)
+    {
+        print(json_encode($objects));
+    }
+
+    function showSingleXmlStatus($notice)
+    {
+        $this->initDocument('xml');
+        $twitter_status = $this->twitterStatusArray($notice);
+        $this->showTwitterXmlStatus($twitter_status);
+        $this->endDocument('xml');
+    }
+
+    function show_single_json_status($notice)
+    {
+        $this->initDocument('json');
+        $status = $this->twitterStatusArray($notice);
+        $this->showJsonObjects($status);
+        $this->endDocument('json');
+    }
+
+
+    function showXmlTimeline($notice)
+    {
+
+        $this->initDocument('xml');
+        $this->elementStart('statuses', array('type' => 'array'));
+
+        if (is_array($notice)) {
+            foreach ($notice as $n) {
+                $twitter_status = $this->twitterStatusArray($n);
+                $this->showTwitterXmlStatus($twitter_status);
+            }
+        } else {
+            while ($notice->fetch()) {
+                $twitter_status = $this->twitterStatusArray($notice);
+                $this->showTwitterXmlStatus($twitter_status);
+            }
+        }
+
+        $this->elementEnd('statuses');
+        $this->endDocument('xml');
+    }
+
+    function showRssTimeline($notice, $title, $link, $subtitle, $suplink=null)
+    {
+
+        $this->initDocument('rss');
+
+        $this->element('title', null, $title);
+        $this->element('link', null, $link);
+        if (!is_null($suplink)) {
+            // For FriendFeed's SUP protocol
+            $this->element('link', array('xmlns' => 'http://www.w3.org/2005/Atom',
+                                         'rel' => 'http://api.friendfeed.com/2008/03#sup',
+                                         'href' => $suplink,
+                                         'type' => 'application/json'));
+        }
+        $this->element('description', null, $subtitle);
+        $this->element('language', null, 'en-us');
+        $this->element('ttl', null, '40');
+
+        if (is_array($notice)) {
+            foreach ($notice as $n) {
+                $entry = $this->twitterRssEntryArray($n);
+                $this->showTwitterRssItem($entry);
+            }
+        } else {
+            while ($notice->fetch()) {
+                $entry = $this->twitterRssEntryArray($notice);
+                $this->showTwitterRssItem($entry);
+            }
+        }
+
+        $this->endTwitterRss();
+    }
+
+    function showAtomTimeline($notice, $title, $id, $link, $subtitle=null, $suplink=null, $selfuri=null)
+    {
+
+        $this->initDocument('atom');
+
+        $this->element('title', null, $title);
+        $this->element('id', null, $id);
+        $this->element('link', array('href' => $link, 'rel' => 'alternate', 'type' => 'text/html'), null);
+
+        if (!is_null($suplink)) {
+            # For FriendFeed's SUP protocol
+            $this->element('link', array('rel' => 'http://api.friendfeed.com/2008/03#sup',
+                                         'href' => $suplink,
+                                         'type' => 'application/json'));
+        }
+
+        if (!is_null($selfuri)) {
+            $this->element('link', array('href' => $selfuri,
+                'rel' => 'self', 'type' => 'application/atom+xml'), null);
+        }
+
+        $this->element('updated', null, common_date_iso8601('now'));
+        $this->element('subtitle', null, $subtitle);
+
+        if (is_array($notice)) {
+            foreach ($notice as $n) {
+                $this->raw($n->asAtomEntry());
+            }
+        } else {
+            while ($notice->fetch()) {
+                $this->raw($notice->asAtomEntry());
+            }
+        }
+
+        $this->endDocument('atom');
+
+    }
+
+    function showRssGroups($group, $title, $link, $subtitle)
+    {
+
+        $this->initDocument('rss');
+
+        $this->element('title', null, $title);
+        $this->element('link', null, $link);
+        $this->element('description', null, $subtitle);
+        $this->element('language', null, 'en-us');
+        $this->element('ttl', null, '40');
+
+        if (is_array($group)) {
+            foreach ($group as $g) {
+                $twitter_group = $this->twitterRssGroupArray($g);
+                $this->showTwitterRssItem($twitter_group);
+            }
+        } else {
+            while ($group->fetch()) {
+                $twitter_group = $this->twitterRssGroupArray($group);
+                $this->showTwitterRssItem($twitter_group);
+            }
+        }
+
+        $this->endTwitterRss();
+    }
+
+
+    function showTwitterAtomEntry($entry)
+    {
+        $this->elementStart('entry');
+        $this->element('title', null, $entry['title']);
+        $this->element('content', array('type' => 'html'), $entry['content']);
+        $this->element('id', null, $entry['id']);
+        $this->element('published', null, $entry['published']);
+        $this->element('updated', null, $entry['updated']);
+        $this->element('link', array('type' => 'text/html',
+                                     'href' => $entry['link'],
+                                     'rel' => 'alternate'));
+        $this->element('link', array('type' => $entry['avatar-type'],
+                                     'href' => $entry['avatar'],
+                                     'rel' => 'image'));
+        $this->elementStart('author');
+
+        $this->element('name', null, $entry['author-name']);
+        $this->element('uri', null, $entry['author-uri']);
+
+        $this->elementEnd('author');
+        $this->elementEnd('entry');
+    }
+
+    function showXmlDirectMessage($dm)
+    {
+        $this->elementStart('direct_message');
+        foreach($dm as $element => $value) {
+            switch ($element) {
+            case 'sender':
+            case 'recipient':
+                $this->showTwitterXmlUser($value, $element);
+                break;
+            case 'text':
+                $this->element($element, null, common_xml_safe_str($value));
+                break;
+            default:
+                $this->element($element, null, $value);
+                break;
+            }
+        }
+        $this->elementEnd('direct_message');
+    }
+
+    function directMessageArray($message)
+    {
+        $dmsg = array();
+
+        $from_profile = $message->getFrom();
+        $to_profile = $message->getTo();
+
+        $dmsg['id'] = $message->id;
+        $dmsg['sender_id'] = $message->from_profile;
+        $dmsg['text'] = trim($message->content);
+        $dmsg['recipient_id'] = $message->to_profile;
+        $dmsg['created_at'] = $this->dateTwitter($message->created);
+        $dmsg['sender_screen_name'] = $from_profile->nickname;
+        $dmsg['recipient_screen_name'] = $to_profile->nickname;
+        $dmsg['sender'] = $this->twitterUserArray($from_profile, false);
+        $dmsg['recipient'] = $this->twitterUserArray($to_profile, false);
+
+        return $dmsg;
+    }
+
+    function rssDirectMessageArray($message)
+    {
+        $entry = array();
+
+        $from = $message->getFrom();
+
+        $entry['title'] = sprintf('Message from %s to %s',
+            $from->nickname, $message->getTo()->nickname);
+
+        $entry['content'] = common_xml_safe_str($message->rendered);
+        $entry['link'] = common_local_url('showmessage', array('message' => $message->id));
+        $entry['published'] = common_date_iso8601($message->created);
+
+        $taguribase = common_config('integration', 'taguri');
+
+        $entry['id'] = "tag:$taguribase:$entry[link]";
+        $entry['updated'] = $entry['published'];
+
+        $entry['author-name'] = $from->getBestName();
+        $entry['author-uri'] = $from->homepage;
+
+        $avatar = $from->getAvatar(AVATAR_STREAM_SIZE);
+
+        $entry['avatar']      = (!empty($avatar)) ? $avatar->url : Avatar::defaultImage(AVATAR_STREAM_SIZE);
+        $entry['avatar-type'] = (!empty($avatar)) ? $avatar->mediatype : 'image/png';
+
+        // RSS item specific
+
+        $entry['description'] = $entry['content'];
+        $entry['pubDate'] = common_date_rfc2822($message->created);
+        $entry['guid'] = $entry['link'];
+
+        return $entry;
+    }
+
+    function showSingleXmlDirectMessage($message)
+    {
+        $this->initDocument('xml');
+        $dmsg = $this->directMessageArray($message);
+        $this->showXmlDirectMessage($dmsg);
+        $this->endDocument('xml');
+    }
+
+    function showSingleJsonDirectMessage($message)
+    {
+        $this->initDocument('json');
+        $dmsg = $this->directMessageArray($message);
+        $this->showJsonObjects($dmsg);
+        $this->endDocument('json');
+    }
+
+    function showAtomGroups($group, $title, $id, $link, $subtitle=null, $selfuri=null)
+    {
+
+        $this->initDocument('atom');
+
+        $this->element('title', null, $title);
+        $this->element('id', null, $id);
+        $this->element('link', array('href' => $link, 'rel' => 'alternate', 'type' => 'text/html'), null);
+
+        if (!is_null($selfuri)) {
+            $this->element('link', array('href' => $selfuri,
+                'rel' => 'self', 'type' => 'application/atom+xml'), null);
+        }
+
+        $this->element('updated', null, common_date_iso8601('now'));
+        $this->element('subtitle', null, $subtitle);
+
+        if (is_array($group)) {
+            foreach ($group as $g) {
+                $this->raw($g->asAtomEntry());
+            }
+        } else {
+            while ($group->fetch()) {
+                $this->raw($group->asAtomEntry());
+            }
+        }
+
+        $this->endDocument('atom');
+
+    }
+
+    function showJsonTimeline($notice)
+    {
+
+        $this->initDocument('json');
+
+        $statuses = array();
+
+        if (is_array($notice)) {
+            foreach ($notice as $n) {
+                $twitter_status = $this->twitterStatusArray($n);
+                array_push($statuses, $twitter_status);
+            }
+        } else {
+            while ($notice->fetch()) {
+                $twitter_status = $this->twitterStatusArray($notice);
+                array_push($statuses, $twitter_status);
+            }
+        }
+
+        $this->showJsonObjects($statuses);
+
+        $this->endDocument('json');
+    }
+
+    function showJsonGroups($group)
+    {
+
+        $this->initDocument('json');
+
+        $groups = array();
+
+        if (is_array($group)) {
+            foreach ($group as $g) {
+                $twitter_group = $this->twitterGroupArray($g);
+                array_push($groups, $twitter_group);
+            }
+        } else {
+            while ($group->fetch()) {
+                $twitter_group = $this->twitterGroupArray($group);
+                array_push($groups, $twitter_group);
+            }
+        }
+
+        $this->showJsonObjects($groups);
+
+        $this->endDocument('json');
+    }
+
+    function showXmlGroups($group)
+    {
+
+        $this->initDocument('xml');
+        $this->elementStart('groups', array('type' => 'array'));
+
+        if (is_array($group)) {
+            foreach ($group as $g) {
+                $twitter_group = $this->twitterGroupArray($g);
+                $this->showTwitterXmlGroup($twitter_group);
+            }
+        } else {
+            while ($group->fetch()) {
+                $twitter_group = $this->twitterGroupArray($group);
+                $this->showTwitterXmlGroup($twitter_group);
+            }
+        }
+
+        $this->elementEnd('groups');
+        $this->endDocument('xml');
+    }
+
+    function showTwitterXmlUsers($user)
+    {
+
+        $this->initDocument('xml');
+        $this->elementStart('users', array('type' => 'array'));
+
+        if (is_array($user)) {
+            foreach ($user as $u) {
+                $twitter_user = $this->twitterUserArray($u);
+                $this->showTwitterXmlUser($twitter_user);
+            }
+        } else {
+            while ($user->fetch()) {
+                $twitter_user = $this->twitterUserArray($user);
+                $this->showTwitterXmlUser($twitter_user);
+            }
+        }
+
+        $this->elementEnd('users');
+        $this->endDocument('xml');
+    }
+
+    function showJsonUsers($user)
+    {
+
+        $this->initDocument('json');
+
+        $users = array();
+
+        if (is_array($user)) {
+            foreach ($user as $u) {
+                $twitter_user = $this->twitterUserArray($u);
+                array_push($users, $twitter_user);
+            }
+        } else {
+            while ($user->fetch()) {
+                $twitter_user = $this->twitterUserArray($user);
+                array_push($users, $twitter_user);
+            }
+        }
+
+        $this->showJsonObjects($users);
+
+        $this->endDocument('json');
+    }
+
+    function showSingleJsonGroup($group)
+    {
+        $this->initDocument('json');
+        $twitter_group = $this->twitterGroupArray($group);
+        $this->showJsonObjects($twitter_group);
+        $this->endDocument('json');
+    }
+
+    function showSingleXmlGroup($group)
+    {
+        $this->initDocument('xml');
+        $twitter_group = $this->twitterGroupArray($group);
+        $this->showTwitterXmlGroup($twitter_group);
+        $this->endDocument('xml');
+    }
+
+    function dateTwitter($dt)
+    {
+        $dateStr = date('d F Y H:i:s', strtotime($dt));
+        $d = new DateTime($dateStr, new DateTimeZone('UTC'));
+        $d->setTimezone(new DateTimeZone(common_timezone()));
+        return $d->format('D M d H:i:s O Y');
+    }
+
+    function initDocument($type='xml')
+    {
+        switch ($type) {
+        case 'xml':
+            header('Content-Type: application/xml; charset=utf-8');
+            $this->startXML();
+            break;
+        case 'json':
+            header('Content-Type: application/json; charset=utf-8');
+
+            // Check for JSONP callback
+            $callback = $this->arg('callback');
+            if ($callback) {
+                print $callback . '(';
+            }
+            break;
+        case 'rss':
+            header("Content-Type: application/rss+xml; charset=utf-8");
+            $this->initTwitterRss();
+            break;
+        case 'atom':
+            header('Content-Type: application/atom+xml; charset=utf-8');
+            $this->initTwitterAtom();
+            break;
+        default:
+            $this->clientError(_('Not a supported data format.'));
+            break;
+        }
+
+        return;
+    }
+
+    function endDocument($type='xml')
+    {
+        switch ($type) {
+        case 'xml':
+            $this->endXML();
+            break;
+        case 'json':
+
+            // Check for JSONP callback
+            $callback = $this->arg('callback');
+            if ($callback) {
+                print ')';
+            }
+            break;
+        case 'rss':
+            $this->endTwitterRss();
+            break;
+        case 'atom':
+            $this->endTwitterRss();
+            break;
+        default:
+            $this->clientError(_('Not a supported data format.'));
+            break;
+        }
+        return;
+    }
+
+    function clientError($msg, $code = 400, $format = 'xml')
+    {
+        $action = $this->trimmed('action');
+
+        common_debug("User error '$code' on '$action': $msg", __FILE__);
+
+        if (!array_key_exists($code, ClientErrorAction::$status)) {
+            $code = 400;
+        }
+
+        $status_string = ClientErrorAction::$status[$code];
+
+        header('HTTP/1.1 '.$code.' '.$status_string);
+
+        if ($format == 'xml') {
+            $this->initDocument('xml');
+            $this->elementStart('hash');
+            $this->element('error', null, $msg);
+            $this->element('request', null, $_SERVER['REQUEST_URI']);
+            $this->elementEnd('hash');
+            $this->endDocument('xml');
+        } elseif ($format == 'json'){
+            $this->initDocument('json');
+            $error_array = array('error' => $msg, 'request' => $_SERVER['REQUEST_URI']);
+            print(json_encode($error_array));
+            $this->endDocument('json');
+        } else {
+
+            // If user didn't request a useful format, throw a regular client error
+            throw new ClientException($msg, $code);
+        }
+    }
+
+    function serverError($msg, $code = 500, $content_type = 'json')
+    {
+        $action = $this->trimmed('action');
+
+        common_debug("Server error '$code' on '$action': $msg", __FILE__);
+
+        if (!array_key_exists($code, ServerErrorAction::$status)) {
+            $code = 400;
+        }
+
+        $status_string = ServerErrorAction::$status[$code];
+
+        header('HTTP/1.1 '.$code.' '.$status_string);
+
+        if ($content_type == 'xml') {
+            $this->initDocument('xml');
+            $this->elementStart('hash');
+            $this->element('error', null, $msg);
+            $this->element('request', null, $_SERVER['REQUEST_URI']);
+            $this->elementEnd('hash');
+            $this->endDocument('xml');
+        } else {
+            $this->initDocument('json');
+            $error_array = array('error' => $msg, 'request' => $_SERVER['REQUEST_URI']);
+            print(json_encode($error_array));
+            $this->endDocument('json');
+        }
+    }
+
+    function initTwitterRss()
+    {
+        $this->startXML();
+        $this->elementStart('rss', array('version' => '2.0', 'xmlns:atom'=>'http://www.w3.org/2005/Atom'));
+        $this->elementStart('channel');
+        Event::handle('StartApiRss', array($this));
+    }
+
+    function endTwitterRss()
+    {
+        $this->elementEnd('channel');
+        $this->elementEnd('rss');
+        $this->endXML();
+    }
+
+    function initTwitterAtom()
+    {
+        $this->startXML();
+        // FIXME: don't hardcode the language here!
+        $this->elementStart('feed', array('xmlns' => 'http://www.w3.org/2005/Atom',
+                                          'xml:lang' => 'en-US',
+                                          'xmlns:thr' => 'http://purl.org/syndication/thread/1.0'));
+        Event::handle('StartApiAtom', array($this));
+    }
+
+    function endTwitterAtom()
+    {
+        $this->elementEnd('feed');
+        $this->endXML();
+    }
+
+    function showProfile($profile, $content_type='xml', $notice=null, $includeStatuses=true)
+    {
+        $profile_array = $this->twitterUserArray($profile, $includeStatuses);
+        switch ($content_type) {
+        case 'xml':
+            $this->showTwitterXmlUser($profile_array);
+            break;
+        case 'json':
+            $this->showJsonObjects($profile_array);
+            break;
+        default:
+            $this->clientError(_('Not a supported data format.'));
+            return;
+        }
+        return;
+    }
+
+    function getTargetUser($id)
+    {
+        if (empty($id)) {
+
+            // Twitter supports these other ways of passing the user ID
+            if (is_numeric($this->arg('id'))) {
+                return User::staticGet($this->arg('id'));
+            } else if ($this->arg('id')) {
+                $nickname = common_canonical_nickname($this->arg('id'));
+                return User::staticGet('nickname', $nickname);
+            } else if ($this->arg('user_id')) {
+                // This is to ensure that a non-numeric user_id still
+                // overrides screen_name even if it doesn't get used
+                if (is_numeric($this->arg('user_id'))) {
+                    return User::staticGet('id', $this->arg('user_id'));
+                }
+            } else if ($this->arg('screen_name')) {
+                $nickname = common_canonical_nickname($this->arg('screen_name'));
+                return User::staticGet('nickname', $nickname);
+            } else {
+                // Fall back to trying the currently authenticated user
+                return $this->auth_user;
+            }
+
+        } else if (is_numeric($id)) {
+            return User::staticGet($id);
+        } else {
+            $nickname = common_canonical_nickname($id);
+            return User::staticGet('nickname', $nickname);
+        }
+    }
+
+    function getTargetGroup($id)
+    {
+        if (empty($id)) {
+            if (is_numeric($this->arg('id'))) {
+                return User_group::staticGet($this->arg('id'));
+            } else if ($this->arg('id')) {
+                $nickname = common_canonical_nickname($this->arg('id'));
+                return User_group::staticGet('nickname', $nickname);
+            } else if ($this->arg('group_id')) {
+                // This is to ensure that a non-numeric user_id still
+                // overrides screen_name even if it doesn't get used
+                if (is_numeric($this->arg('group_id'))) {
+                    return User_group::staticGet('id', $this->arg('group_id'));
+                }
+            } else if ($this->arg('group_name')) {
+                $nickname = common_canonical_nickname($this->arg('group_name'));
+                return User_group::staticGet('nickname', $nickname);
+            }
+
+        } else if (is_numeric($id)) {
+            return User_group::staticGet($id);
+        } else {
+            $nickname = common_canonical_nickname($id);
+            return User_group::staticGet('nickname', $nickname);
+        }
+    }
+
+    function sourceLink($source)
+    {
+        $source_name = _($source);
+        switch ($source) {
+        case 'web':
+        case 'xmpp':
+        case 'mail':
+        case 'omb':
+        case 'api':
+            break;
+        default:
+            $ns = Notice_source::staticGet($source);
+            if ($ns) {
+                $source_name = '<a href="' . $ns->url . '">' . $ns->name . '</a>';
+            }
+            break;
+        }
+        return $source_name;
+    }
+
+    /**
+     * Returns query argument or default value if not found. Certain
+     * parameters used throughout the API are lightly scrubbed and
+     * bounds checked.  This overrides Action::arg().
+     *
+     * @param string $key requested argument
+     * @param string $def default value to return if $key is not provided
+     *
+     * @return var $var
+     */
+    function arg($key, $def=null)
+    {
+
+        // XXX: Do even more input validation/scrubbing?
+
+        if (array_key_exists($key, $this->args)) {
+            switch($key) {
+            case 'page':
+                $page = (int)$this->args['page'];
+                return ($page < 1) ? 1 : $page;
+            case 'count':
+                $count = (int)$this->args['count'];
+                if ($count < 1) {
+                    return 20;
+                } elseif ($count > 200) {
+                    return 200;
+                } else {
+                    return $count;
+                }
+            case 'since_id':
+                $since_id = (int)$this->args['since_id'];
+                return ($since_id < 1) ? 0 : $since_id;
+            case 'max_id':
+                $max_id = (int)$this->args['max_id'];
+                return ($max_id < 1) ? 0 : $max_id;
+            case 'since':
+                return strtotime($this->args['since']);
+            default:
+                return parent::arg($key, $def);
+            }
+        } else {
+            return $def;
+        }
+    }
+
+}