client side of distributed subscription almost complete

darcs-hash:20080527114219-84dde-784ddf4d4650c17bc7a1e3e01219c6948dfc9b3d.gz

1 files changed, 248 insertions, 0 deletions

diff --git a/actions/remotesubscribe.php b/actions/remotesubscribe.php
new file mode 100644
index 000000000..68f5f0fc3
--- /dev/null
+++ b/actions/remotesubscribe.php
@@ -0,0 +1,248 @@
+<?php
+/*
+ * Laconica - a distributed open-source microblogging tool
+ * Copyright (C) 2008, Controlez-Vous, 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('LACONICA')) { exit(1); }
+
+require_once(INSTALLDIR.'/lib/omb.php');
+require_once('Auth/Yadis/Yadis.php');
+
+class RemotesubscribeAction extends Action {
+	
+	function handle($args) {
+		
+		parent::handle($args);
+
+		if (common_logged_in()) {
+			common_user_error(_t('You can use the local subscription!'));
+		    return;
+		}
+
+		if ($_SERVER['REQUEST_METHOD'] == 'POST') {
+			$this->remote_subscription();
+		} else {
+			$this->show_form();
+		}
+	}
+
+	function show_form($err=NULL) {
+		common_show_header(_t('Remote subscribe'));
+		if ($err) {
+			common_element('div', 'error', $err);
+		}
+		common_element_start('form', array('id' => 'remotesubscribe', 'method' => 'POST',
+										   'action' => common_local_url('remotesubscribe')));
+		common_input('profile', _t('Profile URL'));
+		common_submit('submit', _t('Subscribe'));
+		common_element_end('form');
+	}
+	
+	function remote_subscription() {
+		$user = $this->get_user();
+		
+		if (!$user) {
+			$this->show_form(_t('No such user!'));
+			return;
+		}
+		
+		$profile = $this->trimmed('profile');
+		
+		if (!$profile) {
+			$this->show_form(_t('No such user!'));
+			return;
+		}
+		
+		if (!Validate::uri($profile, array('allowed_schemes' => array('http', 'https')))) {
+			$this->show_form(_t('Invalid profile URL (bad format)'));
+			return;
+		}
+		
+		$fetcher = Auth_Yadis_Yadis::getHTTPFetcher();
+		$yadis = Auth_Yadis_Yadis::discover($profile, $fetcher);
+		
+		if (!$yadis) {
+			$this->show_form(_t('Not a valid profile URL (no YADIS document).'));
+			return;
+		}
+		
+		$omb = $this->getOmb($yadis);
+		
+		if (!$omb) {
+			$this->show_form(_t('Not a valid profile URL (incorrect services).'));
+			return;
+		}
+		
+		list($token, $secret) = $this->request_token($omb);
+		
+		if (!$token || !$secret) {
+			$this->show_form(_t('Couldn\'t get a request token.'));
+			return;
+		}
+		
+		$this->request_authorization($user, $omb, $token, $secret);
+	}
+	
+	function get_user() {
+		$user = NULL;
+		$nickname = $this->trimmed('nickname');
+		if ($nickname) {
+			$user = User::staticGet('nickname', $nickname);
+		}
+		return $user;
+	}
+
+	function getOmb($yadis) {
+	    static $endpoints = array(OMB_ENDPOINT_UPDATEPROFILE, OMB_ENDPOINT_POSTNOTICE,
+								  OAUTH_ENDPOINT_REQUEST, OAUTH_ENDPOINT_AUTHORIZE,
+								  OAUTH_ENDPOINT_ACCESS);
+		$omb = array();
+		$services = $yadis->services(); # ordered by priority
+		foreach ($services as $service) {
+			$types = $service->matchTypes($endpoints);
+			foreach ($types as $type) {
+				# We take the first one, since it's the highest priority
+				if (!array_key_exists($type, $omb)) {
+					# URIs is an array, priority-ordered
+					$omb[$type] = $service->getURIs();
+					# Special handling for request
+					if ($type == OAUTH_ENDPOINT_REQUEST) {
+						$nodes = $service->getElements('LocalID');
+						if (!$nodes) {
+							# error
+							return NULL;
+						}
+						$omb['listener'] = $service->parser->content($nodes[0]);
+					}
+				}
+			}
+		}
+		foreach ($endpoints as $ep) {
+			if (!array_key_exists($ep, $omb)) {
+				return NULL;
+			}
+		}
+		if (!array_key_exists('listener', $omb)) {
+			return NULL;
+		}
+		return $omb;
+	}
+	
+	function request_token($omb) {
+		$con = omb_oauth_consumer();
+
+		$url = $omb[OAUTH_ENDPOINT_REQUEST][0];
+		
+		# XXX: Is this the right thing to do? Strip off GET params and make them
+		# POST params? Seems wrong to me.
+		
+		$parsed = parse_url($url);
+		$params = array();
+		parse_str($parsed['query'], $params);
+
+		$req = OAuthRequest::from_consumer_and_token($con, NULL, "POST", $url, $params);
+		
+		$req->set_parameter('omb_listener', $omb['listener']);
+		$req->set_parameter('omb_version', OMB_VERSION_01);
+		
+		# XXX: test to see if endpoint accepts this signature method
+
+		$req->sign_request(omb_hmac_sha1(), $con, NULL);
+		
+		# We re-use this tool's fetcher, since it's pretty good
+		
+		$fetcher = Auth_Yadis_Yadis::getHTTPFetcher();
+		$result = $fetcher->post($req->get_normalized_http_url(),
+								 $req->to_postdata());
+		
+		if ($result->status != 200) {
+			return NULL;
+		}
+
+		parse_str($result->body, $return);
+		
+		return array($return['oauth_token'], $return['oauth_token_secret']);
+	}
+	
+	function request_authorization($user, $omb, $token, $secret) {
+		global $config; # for license URL
+		
+		$con = omb_oauth_consumer();
+		$tok = new OAuthToken($token, $secret);
+		
+		$url = $omb[OAUTH_ENDPOINT_AUTHORIZE][0];
+		
+		# XXX: Is this the right thing to do? Strip off GET params and make them
+		# POST params? Seems wrong to me.
+		
+		$parsed = parse_url($url);
+		$params = array();
+		parse_str($parsed['query'], $params);
+
+		$req = OAuthRequest::from_consumer_and_token($con, $tok, 'GET', $url, $params);
+		
+		# We send over a ton of information. This lets the other
+		# server store info about our user, and it lets the current
+		# user decide if they really want to authorize the subscription.
+		
+		$req->set_parameter('omb_version', OMB_VERSION_01);
+		$req->set_parameter('omb_listener', $omb['listener']);
+		$req->set_parameter('omb_listenee', $user->uri);
+		$req->set_parameter('omb_listenee_profile', common_profile_url($user->nickname));
+		$req->set_parameter('omb_listenee_nickname', $user->nickname);
+		$req->set_parameter('omb_listenee_license', $config['license']['url']);
+		$profile = $user->getProfile();
+		if ($profile->fullname) {
+			$req->set_parameter('omb_listenee_fullname', $profile->fullname);
+		}
+		if ($profile->homepage) {
+			$req->set_parameter('omb_listenee_homepage', $profile->homepage);
+		}
+		if ($profile->bio) {
+			$req->set_parameter('omb_listenee_bio', $profile->bio);
+		}
+		if ($profile->location) {
+			$req->set_parameter('omb_listenee_location', $profile->location);
+		}
+		$avatar = $profile->getAvatar(AVATAR_PROFILE_SIZE);
+		if ($avatar) {
+			$req->set_parameter('omb_listenee_avatar', $avatar->url);
+		}
+
+		$nonce = $this->make_nonce();
+		
+		$req->set_parameter('oauth_callback', common_local_url('finishremotesubscribe',
+															   array('nonce' => $nonce)));
+							
+		# XXX: test to see if endpoint accepts this signature method
+
+		$req->sign_request(omb_hmac_sha1(), $con, $tok);
+		
+		# store all our info here
+
+		$omb['listenee'] = $user->nickname;
+		$omb['token'] = $token;
+		$omb['secret'] = $secret;
+		
+		$_SESSION[$nonce] = $omb;
+		
+		# Redirect to authorization service
+		
+		common_redirect($req->to_url());
+		return;
+	}
+}
\ No newline at end of file