actions/remotesubscribe.php

   1 <?php
   2 /*
   3  * Laconica - a distributed open-source microblogging tool
   4  * Copyright (C) 2008, Controlez-Vous, Inc.
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU Affero General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU Affero General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Affero General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 if (!defined('LACONICA')) { exit(1); }
  21
  22 require_once(INSTALLDIR.'/lib/omb.php');
  23 require_once('Auth/Yadis/Yadis.php');
  24
  25 class RemotesubscribeAction extends Action {
  26
  27         function handle($args) {
  28
  29                 parent::handle($args);
  30
  31                 if (common_logged_in()) {
  32                         common_user_error(_t('You can use the local subscription!'));
  33                     return;
  34                 }
  35
  36                 if ($_SERVER['REQUEST_METHOD'] == 'POST') {
  37                         $this->remote_subscription();
  38                 } else {
  39                         $this->show_form();
  40                 }
  41         }
  42
  43         function show_form($err=NULL) {
  44                 $nickname = $this->trimmed('nickname');
  45                 common_show_header(_t('Remote subscribe'));
  46                 if ($err) {
  47                         common_element('div', 'error', $err);
  48                 }
  49                 common_element_start('form', array('id' => 'remotesubscribe', 'method' => 'POST',
  50                                                                                    'action' => common_local_url('remotesubscribe')));
  51                 common_input('nickname', _t('User nickname'), $nickname);
  52                 common_input('profile', _t('Profile URL'));
  53                 common_submit('submit', _t('Subscribe'));
  54                 common_element_end('form');
  55                 common_show_footer();
  56         }
  57
  58         function remote_subscription() {
  59                 $user = $this->get_user();
  60
  61                 if (!$user) {
  62                         $this->show_form(_t('No such user!'));
  63                         return;
  64                 }
  65
  66                 $profile = $this->trimmed('profile');
  67
  68                 if (!$profile) {
  69                         $this->show_form(_t('No such user!'));
  70                         return;
  71                 }
  72
  73                 if (!Validate::uri($profile, array('allowed_schemes' => array('http', 'https')))) {
  74                         $this->show_form(_t('Invalid profile URL (bad format)'));
  75                         return;
  76                 }
  77
  78                 $fetcher = Auth_Yadis_Yadis::getHTTPFetcher();
  79                 $yadis = Auth_Yadis_Yadis::discover($profile, $fetcher);
  80
  81                 if (!$yadis) {
  82                         $this->show_form(_t('Not a valid profile URL (no YADIS document).'));
  83                         return;
  84                 }
  85
  86                 $omb = $this->getOmb($yadis);
  87
  88                 if (!$omb) {
  89                         $this->show_form(_t('Not a valid profile URL (incorrect services).'));
  90                         return;
  91                 }
  92
  93                 list($token, $secret) = $this->request_token($omb);
  94
  95                 if (!$token || !$secret) {
  96                         $this->show_form(_t('Couldn\'t get a request token.'));
  97                         return;
  98                 }
  99
 100                 $this->request_authorization($user, $omb, $token, $secret);
 101         }
 102
 103         function get_user() {
 104                 $user = NULL;
 105                 $nickname = $this->trimmed('nickname');
 106                 if ($nickname) {
 107                         $user = User::staticGet('nickname', $nickname);
 108                 }
 109                 return $user;
 110         }
 111
 112         function getOmb($yadis) {
 113             static $endpoints = array(OMB_ENDPOINT_UPDATEPROFILE, OMB_ENDPOINT_POSTNOTICE,
 114                                                                   OAUTH_ENDPOINT_REQUEST, OAUTH_ENDPOINT_AUTHORIZE,
 115                                                                   OAUTH_ENDPOINT_ACCESS);
 116                 $omb = array();
 117                 $services = $yadis->services(); # ordered by priority
 118                 if (!$services) {
 119                         return NULL;
 120                 }
 121
 122                 foreach ($services as $service) {
 123                         $types = $service->matchTypes($endpoints);
 124                         foreach ($types as $type) {
 125                                 # We take the first one, since it's the highest priority
 126                                 if (!array_key_exists($type, $omb)) {
 127                                         # URIs is an array, priority-ordered
 128                                         $omb[$type] = $service->getURIs();
 129                                         # Special handling for request
 130                                         if ($type == OAUTH_ENDPOINT_REQUEST) {
 131                                                 $nodes = $service->getElements('LocalID');
 132                                                 if (!$nodes) {
 133                                                         # error
 134                                                         return NULL;
 135                                                 }
 136                                                 $omb['listener'] = $service->parser->content($nodes[0]);
 137                                         }
 138                                 }
 139                         }
 140                 }
 141                 foreach ($endpoints as $ep) {
 142                         if (!array_key_exists($ep, $omb)) {
 143                                 return NULL;
 144                         }
 145                 }
 146                 if (!array_key_exists('listener', $omb)) {
 147                         return NULL;
 148                 }
 149                 return $omb;
 150         }
 151
 152         function request_token($omb) {
 153                 $con = omb_oauth_consumer();
 154
 155                 $url = $omb[OAUTH_ENDPOINT_REQUEST][0];
 156
 157                 # XXX: Is this the right thing to do? Strip off GET params and make them
 158                 # POST params? Seems wrong to me.
 159
 160                 $parsed = parse_url($url);
 161                 $params = array();
 162                 parse_str($parsed['query'], $params);
 163
 164                 $req = OAuthRequest::from_consumer_and_token($con, NULL, "POST", $url, $params);
 165
 166                 $req->set_parameter('omb_listener', $omb['listener']);
 167                 $req->set_parameter('omb_version', OMB_VERSION_01);
 168
 169                 # XXX: test to see if endpoint accepts this signature method
 170
 171                 $req->sign_request(omb_hmac_sha1(), $con, NULL);
 172
 173                 # We re-use this tool's fetcher, since it's pretty good
 174
 175                 $fetcher = Auth_Yadis_Yadis::getHTTPFetcher();
 176                 $result = $fetcher->post($req->get_normalized_http_url(),
 177                                                                  $req->to_postdata());
 178
 179                 if ($result->status != 200) {
 180                         return NULL;
 181                 }
 182
 183                 parse_str($result->body, $return);
 184
 185                 return array($return['oauth_token'], $return['oauth_token_secret']);
 186         }
 187
 188         function request_authorization($user, $omb, $token, $secret) {
 189                 global $config; # for license URL
 190
 191                 $con = omb_oauth_consumer();
 192                 $tok = new OAuthToken($token, $secret);
 193
 194                 $url = $omb[OAUTH_ENDPOINT_AUTHORIZE][0];
 195
 196                 # XXX: Is this the right thing to do? Strip off GET params and make them
 197                 # POST params? Seems wrong to me.
 198
 199                 $parsed = parse_url($url);
 200                 $params = array();
 201                 parse_str($parsed['query'], $params);
 202
 203                 $req = OAuthRequest::from_consumer_and_token($con, $tok, 'GET', $url, $params);
 204
 205                 # We send over a ton of information. This lets the other
 206                 # server store info about our user, and it lets the current
 207                 # user decide if they really want to authorize the subscription.
 208
 209                 $req->set_parameter('omb_version', OMB_VERSION_01);
 210                 $req->set_parameter('omb_listener', $omb['listener']);
 211                 $req->set_parameter('omb_listenee', $user->uri);
 212                 $req->set_parameter('omb_listenee_profile', common_profile_url($user->nickname));
 213                 $req->set_parameter('omb_listenee_nickname', $user->nickname);
 214                 $req->set_parameter('omb_listenee_license', $config['license']['url']);
 215                 $profile = $user->getProfile();
 216                 if ($profile->fullname) {
 217                         $req->set_parameter('omb_listenee_fullname', $profile->fullname);
 218                 }
 219                 if ($profile->homepage) {
 220                         $req->set_parameter('omb_listenee_homepage', $profile->homepage);
 221                 }
 222                 if ($profile->bio) {
 223                         $req->set_parameter('omb_listenee_bio', $profile->bio);
 224                 }
 225                 if ($profile->location) {
 226                         $req->set_parameter('omb_listenee_location', $profile->location);
 227                 }
 228                 $avatar = $profile->getAvatar(AVATAR_PROFILE_SIZE);
 229                 if ($avatar) {
 230                         $req->set_parameter('omb_listenee_avatar', $avatar->url);
 231                 }
 232
 233                 $nonce = $this->make_nonce();
 234
 235                 $req->set_parameter('oauth_callback', common_local_url('finishremotesubscribe',
 236                                                                                                                            array('nonce' => $nonce)));
 237
 238                 # XXX: test to see if endpoint accepts this signature method
 239
 240                 $req->sign_request(omb_hmac_sha1(), $con, $tok);
 241
 242                 # store all our info here
 243
 244                 $omb['listenee'] = $user->nickname;
 245                 $omb['token'] = $token;
 246                 $omb['secret'] = $secret;
 247
 248                 $_SESSION[$nonce] = $omb;
 249
 250                 # Redirect to authorization service
 251
 252                 common_redirect($req->to_url());
 253                 return;
 254         }
 255 }