add atompub show membership action

diff --git a/actions/atompubshowmembership.php b/actions/atompubshowmembership.php
new file mode 100644 (file)
index 0000000..6d848a2
--- /dev/null
+++ b/actions/atompubshowmembership.php
@@ -0,0 +1,235 @@
+<?php
+/**
+ * StatusNet - the distributed open-source microblogging tool
+ * Copyright (C) 2010, StatusNet, Inc.
+ *
+ * Show a single membership as an Activity Streams entry
+ * 
+ * PHP version 5
+ *
+ * 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  AtomPub
+ * @package   StatusNet
+ * @author    Evan Prodromou <evan@status.net>
+ * @copyright 2010 StatusNet, Inc.
+ * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
+ * @link      http://status.net/
+ */
+
+if (!defined('STATUSNET')) {
+    // This check helps protect against security problems;
+    // your code file can't be executed directly from the web.
+    exit(1);
+}
+
+require_once INSTALLDIR . '/lib/apiauth.php';
+
+/**
+ * Show (or delete) a single membership event as an ActivityStreams entry
+ *
+ * @category  AtomPub
+ * @package   StatusNet
+ * @author    Evan Prodromou <evan@status.net>
+ * @copyright 2010 StatusNet, Inc.
+ * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
+ * @link      http://status.net/
+ */
+
+class AtompubshowmembershipAction extends ApiAuthAction
+{
+    private $_profile    = null;
+    private $_group      = null;
+    private $_membership = null;
+
+    /**
+     * For initializing members of the class.
+     *
+     * @param array $argarray misc. arguments
+     *
+     * @return boolean true
+     */
+
+    function prepare($argarray)
+    {
+        parent::prepare($argarray);
+
+        $profileId = $this->trimmed('profile');
+
+        $this->_profile = Profile::staticGet('id', $profileId);
+        
+        if (empty($this->_profile)) {
+            throw new ClientException(_('No such profile.'), 404);
+        }
+
+        $groupId = $this->trimmed('group');
+
+        $this->_group = User_group::staticGet('id', $groupId);
+
+        if (empty($this->_group)) {
+            throw new ClientException(_('No such group'), 404);
+        }
+
+        $kv = array('group_id' => $groupId,
+                    'profile_id' => $profileId);
+
+        $this->_membership = Group_member::pkeyGet($kv);
+
+        if (empty($this->_membership)) {
+            throw new ClientException(_('Not a member'), 404);
+        }
+
+        return true;
+    }
+
+    /**
+     * Handler method
+     *
+     * @param array $argarray is ignored since it's now passed in in prepare()
+     *
+     * @return void
+     */
+
+    function handle($argarray=null)
+    {
+        switch ($_SERVER['REQUEST_METHOD']) {
+        case 'GET':
+        case 'HEAD':
+            $this->showMembership();
+            break;
+        case 'DELETE':
+            $this->deleteMembership();
+            break;
+        default:
+            throw new ClientException(_('Method not supported'), 405);
+            break;
+        }
+        return;
+    }
+
+    /**
+     * show a single membership
+     *
+     * @return void
+     */
+
+    function showMembership()
+    {
+        $activity = $this->_membership->asActivity();
+
+        header('Content-Type: application/atom+xml; charset=utf-8');
+
+        $this->startXML();
+        $this->raw($activity->asString(true, true, true));
+        $this->endXML();
+
+        return;
+    }
+
+    /**
+     * Delete the membership (leave the group)
+     *
+     * @return void
+     */
+
+    function deleteMembership()
+    {
+        if (empty($this->auth_user) ||
+            $this->auth_user->id != $this->_profile->id) {
+            throw new ClientException(_("Can't delete someone else's".
+                                        " membership"), 403);
+        }
+
+        if (Event::handle('StartLeaveGroup', array($this->_group, $this->auth_user))) {
+            Group_member::leave($this->_group->id, $this->auth_user->id);
+            Event::handle('EndLeaveGroup', array($this->_group, $this->auth_user));
+        }
+
+        return;
+    }
+
+    /**
+     * Return true if read only.
+     *
+     * MAY override
+     *
+     * @param array $args other arguments
+     *
+     * @return boolean is read only action?
+     */
+
+    function isReadOnly($args)
+    {
+        if ($_SERVER['REQUEST_METHOD'] == 'GET' ||
+            $_SERVER['REQUEST_METHOD'] == 'HEAD') {
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    /**
+     * Return last modified, if applicable.
+     *
+     * Because the representation depends on the profile and group,
+     * our last modified value is the maximum of their mod time
+     * with the actual membership's mod time.
+     *
+     * @return string last modified http header
+     */
+    function lastModified()
+    {
+        return max(strtotime($this->_profile->modified),
+                   strtotime($this->_group->modified),
+                   strtotime($this->_membership->modified));
+    }
+
+    /**
+     * Return etag, if applicable.
+     *
+     * A "weak" Etag including the profile and group id as well as
+     * the admin flag and ctime of the membership.
+     *
+     * @return string etag http header
+     */
+
+    function etag()
+    {
+        $ctime = strtotime($this->_membership->created);
+
+        $adminflag = ($this->_membership->is_admin) ? 't' : 'f';
+
+        return 'W/"' . implode(':', array('AtomPubShowMembership',
+                                          $this->_profile->id,
+                                          $this->_group->id,
+                                          $adminflag,
+                                          $ctime)) . '"';
+    }
+
+    /**
+     * Does this require authentication?
+     *
+     * @return boolean true if delete, else false
+     */
+
+    function requiresAuth()
+    {
+        if ($_SERVER['REQUEST_METHOD'] == 'GET' ||
+            $_SERVER['REQUEST_METHOD'] == 'HEAD') {
+            return false;
+        } else {
+            return true;
+        }
+    }
+}