actions/api.php

   1 <?php
   2 /*
   3  * Laconica - a distributed open-source microblogging tool
   4  * Copyright (C) 2008, 2009, Control Yourself, 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 class ApiAction extends Action
  23 {
  24
  25     var $user;
  26     var $content_type;
  27     var $api_arg;
  28     var $api_method;
  29     var $api_action;
  30
  31     function handle($args)
  32     {
  33         parent::handle($args);
  34
  35         $this->api_action = $this->arg('apiaction');
  36         $method = $this->arg('method');
  37         $argument = $this->arg('argument');
  38
  39         if (isset($argument)) {
  40             $cmdext = explode('.', $argument);
  41             $this->api_arg =  $cmdext[0];
  42             $this->api_method = $method;
  43             $this->content_type = strtolower($cmdext[1]);
  44         } else {
  45
  46             # Requested format / content-type will be an extension on the method
  47             $cmdext = explode('.', $method);
  48             $this->api_method = $cmdext[0];
  49             $this->content_type = strtolower($cmdext[1]);
  50         }
  51
  52         if ($this->requires_auth()) {
  53             if (!isset($_SERVER['PHP_AUTH_USER'])) {
  54
  55                 # This header makes basic auth go
  56                 header('WWW-Authenticate: Basic realm="Laconica API"');
  57
  58                 # If the user hits cancel -- bam!
  59                 $this->show_basic_auth_error();
  60             } else {
  61                 $nickname = $_SERVER['PHP_AUTH_USER'];
  62                 $password = $_SERVER['PHP_AUTH_PW'];
  63                 $user = common_check_user($nickname, $password);
  64
  65                 if ($user) {
  66                     $this->user = $user;
  67                     $this->process_command();
  68                 } else {
  69                     # basic authentication failed
  70                     list($proxy, $ip) = common_client_ip();
  71
  72                     common_log(LOG_WARNING, "Failed API auth attempt, nickname = $nickname, proxy = $proxy, ip = $ip.");
  73                     $this->show_basic_auth_error();
  74                 }
  75             }
  76         } else {
  77
  78             // Caller might give us a username even if not required
  79             if (isset($_SERVER['PHP_AUTH_USER'])) {
  80                 $user = User::staticGet('nickname', $_SERVER['PHP_AUTH_USER']);
  81                 if ($user) {
  82                     $this->user = $user;
  83                 }
  84                 # Twitter doesn't throw an error if the user isn't found
  85             }
  86
  87             $this->process_command();
  88         }
  89     }
  90
  91     function process_command()
  92     {
  93         $action = "twitapi$this->api_action";
  94         $actionfile = INSTALLDIR."/actions/$action.php";
  95
  96         if (file_exists($actionfile)) {
  97             require_once($actionfile);
  98             $action_class = ucfirst($action)."Action";
  99             $action_obj = new $action_class();
 100
 101             if (!$action_obj->prepare($this->args)) {
 102                 return;
 103             }
 104
 105             if (method_exists($action_obj, $this->api_method)) {
 106                 $apidata = array(    'content-type' => $this->content_type,
 107                                     'api_method' => $this->api_method,
 108                                     'api_arg' => $this->api_arg,
 109                                     'user' => $this->user);
 110
 111                 call_user_func(array($action_obj, $this->api_method), $_REQUEST, $apidata);
 112             } else {
 113                 $this->clientError("API method not found!", $code=404);
 114             }
 115         } else {
 116             $this->clientError("API method not found!", $code=404);
 117         }
 118     }
 119
 120     // Whitelist of API methods that don't need authentication
 121     function requires_auth()
 122     {
 123         static $noauth = array( 'statuses/public_timeline',
 124                                 'statuses/show',
 125                                 'users/show',
 126                                 'help/test',
 127                                 'help/downtime_schedule',
 128                                 'laconica/version',
 129                                 'laconica/config',
 130                                 'laconica/wadl',
 131                                 'tags/timeline',
 132                                 'oembed/oembed',
 133                                 'groups/timeline');
 134
 135         static $bareauth = array('statuses/user_timeline',
 136                                  'statuses/friends_timeline',
 137                                  'statuses/friends',
 138                                  'statuses/replies',
 139                                  'statuses/mentions',
 140                                  'statuses/followers',
 141                                  'favorites/favorites',
 142                                  'friendships/show');
 143
 144         $fullname = "$this->api_action/$this->api_method";
 145
 146         // If the site is "private", all API methods except laconica/config
 147         // need authentication
 148
 149         if (common_config('site', 'private')) {
 150             return $fullname != 'laconica/config' || false;
 151         }
 152
 153         // bareauth: only needs auth if without an argument or query param specifying user
 154
 155         if (in_array($fullname, $bareauth)) {
 156
 157             // Special case: friendships/show only needs auth if source_id or
 158             // source_screen_name is not specified as a param
 159
 160             if ($fullname == 'friendships/show') {
 161
 162                 $source_id          = $this->arg('source_id');
 163                 $source_screen_name = $this->arg('source_screen_name');
 164
 165                 if (empty($source_id) && empty($source_screen_name)) {
 166                     return true;
 167                 }
 168
 169                 return false;
 170             }
 171
 172             // if all of these are empty, auth is required
 173
 174             $id          = $this->arg('id');
 175             $user_id     = $this->arg('user_id');
 176             $screen_name = $this->arg('screen_name');
 177
 178             if (empty($this->api_arg) &&
 179                 empty($id)            &&
 180                 empty($user_id)       &&
 181                 empty($screen_name)) {
 182                 return true;
 183             } else {
 184                 return false;
 185             }
 186
 187         } else if (in_array($fullname, $noauth)) {
 188
 189             // noauth: never needs auth
 190
 191             return false;
 192         } else {
 193
 194             // everybody else needs auth
 195
 196             return true;
 197         }
 198     }
 199
 200     function show_basic_auth_error()
 201     {
 202         header('HTTP/1.1 401 Unauthorized');
 203         $msg = 'Could not authenticate you.';
 204
 205         if ($this->content_type == 'xml') {
 206             header('Content-Type: application/xml; charset=utf-8');
 207             $this->startXML();
 208             $this->elementStart('hash');
 209             $this->element('error', null, $msg);
 210             $this->element('request', null, $_SERVER['REQUEST_URI']);
 211             $this->elementEnd('hash');
 212             $this->endXML();
 213         } else if ($this->content_type == 'json')  {
 214             header('Content-Type: application/json; charset=utf-8');
 215             $error_array = array('error' => $msg, 'request' => $_SERVER['REQUEST_URI']);
 216             print(json_encode($error_array));
 217         } else {
 218             header('Content-type: text/plain');
 219             print "$msg\n";
 220         }
 221     }
 222
 223     function isReadOnly($args)
 224     {
 225         $apiaction = $args['apiaction'];
 226         $method = $args['method'];
 227
 228         list($cmdtext, $fmt) = explode('.', $method);
 229
 230         static $write_methods = array(
 231             'account' => array('update_location', 'update_delivery_device', 'end_session'),
 232             'blocks' => array('create', 'destroy'),
 233             'direct_messages' => array('create', 'destroy'),
 234             'favorites' => array('create', 'destroy'),
 235             'friendships' => array('create', 'destroy'),
 236             'help' => array(),
 237             'notifications' => array('follow', 'leave'),
 238             'statuses' => array('update', 'destroy'),
 239             'users' => array()
 240         );
 241
 242         if (array_key_exists($apiaction, $write_methods)) {
 243             if (!in_array($cmdtext, $write_methods[$apiaction])) {
 244                 return true;
 245             }
 246         }
 247
 248         return false;
 249     }
 250 }