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<?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); }
class ApiAction extends Action {
var $user;
var $content_type;
var $api_arg;
var $api_method;
var $api_action;
function handle($args) {
parent::handle($args);
$this->api_action = $this->arg('apiaction');
$method = $this->arg('method');
$argument = $this->arg('argument');
if (isset($argument)) {
$cmdext = explode('.', $argument);
$this->api_arg = $cmdext[0];
$this->api_method = $method;
$this->content_type = strtolower($cmdext[1]);
} else {
# Requested format / content-type will be an extension on the method
$cmdext = explode('.', $method);
$this->api_method = $cmdext[0];
$this->content_type = strtolower($cmdext[1]);
}
if($this->requires_auth()) {
if (!isset($_SERVER['PHP_AUTH_USER'])) {
# This header makes basic auth go
header('WWW-Authenticate: Basic realm="Laconica API"');
# If the user hits cancel -- bam!
$this->show_basic_auth_error();
} else {
$nickname = $_SERVER['PHP_AUTH_USER'];
$password = $_SERVER['PHP_AUTH_PW'];
$user = common_check_user($nickname, $password);
if ($user) {
$this->user = $user;
$this->process_command();
} else {
# basic authentication failed
$this->show_basic_auth_error();
}
}
} else {
# Caller might give us a username even if not required
if (isset($_SERVER['PHP_AUTH_USER'])) {
$user = User::staticGet('nickname', $_SERVER['PHP_AUTH_USER']);
if ($user) {
$this->user = $user;
}
# Twitter doesn't throw an error if the user isn't found
}
$this->process_command();
}
}
function process_command() {
$action = "twitapi$this->api_action";
$actionfile = INSTALLDIR."/actions/$action.php";
if (file_exists($actionfile)) {
require_once($actionfile);
$action_class = ucfirst($action)."Action";
$action_obj = new $action_class();
if (method_exists($action_obj, $this->api_method)) {
$apidata = array( 'content-type' => $this->content_type,
'api_method' => $this->api_method,
'api_arg' => $this->api_arg,
'user' => $this->user);
call_user_func(array($action_obj, $this->api_method), $_REQUEST, $apidata);
} else {
common_user_error("API method not found!", $code=404);
}
} else {
common_user_error("API method not found!", $code=404);
}
}
# Whitelist of API methods that don't need authentication
function requires_auth() {
static $noauth = array( 'statuses/public_timeline',
'statuses/show',
'users/show',
'help/test',
'help/downtime_schedule');
static $bareauth = array('statuses/user_timeline',
'statuses/friends',
'statuses/followers',
'favorites/favorites');
$fullname = "$this->api_action/$this->api_method";
if (in_array($fullname, $bareauth)) {
# bareauth: only needs auth if without an argument
if ($this->api_arg) {
return false;
} else {
return true;
}
} else if (in_array($fullname, $noauth)) {
# noauth: never needs auth
return false;
} else {
# everybody else needs auth
return true;
}
}
function show_basic_auth_error() {
header('HTTP/1.1 401 Unauthorized');
$msg = 'Could not authenticate you.';
if ($this->content_type == 'xml') {
header('Content-Type: application/xml; charset=utf-8');
common_start_xml();
common_element_start('hash');
common_element('error', NULL, $msg);
common_element('request', NULL, $_SERVER['REQUEST_URI']);
common_element_end('hash');
common_end_xml();
} else if ($this->content_type == 'json') {
header('Content-Type: application/json; charset=utf-8');
$error_array = array('error' => $msg, 'request' => $_SERVER['REQUEST_URI']);
print(json_encode($error_array));
} else {
header('Content-type: text/plain');
print "$msg\n";
}
}
function is_readonly() {
# NOTE: before handle(), can't use $this->arg
$apiaction = $_REQUEST['apiaction'];
$method = $_REQUEST['method'];
list($cmdtext, $fmt) = explode('.', $method);
static $write_methods = array(
'account' => array('update_location', 'update_delivery_device', 'end_session'),
'blocks' => array('create', 'destroy'),
'direct_messages' => array('create', 'destroy'),
'favorites' => array('create', 'destroy'),
'friendships' => array('create', 'destroy'),
'help' => array(),
'notifications' => array('follow', 'leave'),
'statuses' => array('update', 'destroy'),
'users' => array()
);
if (array_key_exists($apiaction, $write_methods)) {
common_debug("checking method");
if (!in_array($cmdtext, $write_methods[$apiaction])) {
return true;
}
}
return false;
}
}
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