drupal-civicrm/sites/all/modules/civicrm/CRM/Utils/REST.php

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2018-01-14 15:10:16 +02:00
<?php
/*
+--------------------------------------------------------------------+
| CiviCRM version 4.7 |
+--------------------------------------------------------------------+
| Copyright CiviCRM LLC (c) 2004-2017 |
+--------------------------------------------------------------------+
| This file is a part of CiviCRM. |
| |
| CiviCRM is free software; you can copy, modify, and distribute it |
| under the terms of the GNU Affero General Public License |
| Version 3, 19 November 2007 and the CiviCRM Licensing Exception. |
| |
| CiviCRM 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 and the CiviCRM Licensing Exception along |
| with this program; if not, contact CiviCRM LLC |
| at info[AT]civicrm[DOT]org. If you have questions about the |
| GNU Affero General Public License or the licensing of CiviCRM, |
| see the CiviCRM license FAQ at http://civicrm.org/licensing |
+--------------------------------------------------------------------+
*/
/**
* This class handles all REST client requests.
*
* @package CRM
* @copyright CiviCRM LLC (c) 2004-2017
*/
class CRM_Utils_REST {
/**
* Number of seconds we should let a REST process idle
*/
static $rest_timeout = 0;
/**
* Cache the actual UF Class
*/
public $ufClass;
/**
* Class constructor. This caches the real user framework class locally,
* so we can use it for authentication and validation.
*
* @internal param string $uf The userframework class
*/
public function __construct() {
// any external program which call Rest Server is responsible for
// creating and attaching the session
$args = func_get_args();
$this->ufClass = array_shift($args);
}
/**
* Simple ping function to test for liveness.
*
* @param string $var
* The string to be echoed.
*
* @return string
*/
public static function ping($var = NULL) {
$session = CRM_Core_Session::singleton();
$key = $session->get('key');
// $session->set( 'key', $var );
return self::simple(array('message' => "PONG: $key"));
}
/**
* Generates values needed for error messages.
* @param string $message
*
* @return array
*/
public static function error($message = 'Unknown Error') {
$values = array(
'error_message' => $message,
'is_error' => 1,
);
return $values;
}
/**
* Generates values needed for non-error responses.
* @param array $params
*
* @return array
*/
public static function simple($params) {
$values = array('is_error' => 0);
$values += $params;
return $values;
}
/**
* @return string
*/
public function run() {
$result = self::handle();
return self::output($result);
}
/**
* @return string
*/
public function bootAndRun() {
$response = $this->loadCMSBootstrap();
if (is_array($response)) {
return self::output($response);
}
return $this->run();
}
/**
* @param $result
*
* @return string
*/
public static function output(&$result) {
$requestParams = CRM_Utils_Request::exportValues();
$hier = FALSE;
if (is_scalar($result)) {
if (!$result) {
$result = 0;
}
$result = self::simple(array('result' => $result));
}
elseif (is_array($result)) {
if (CRM_Utils_Array::isHierarchical($result)) {
$hier = TRUE;
}
elseif (!array_key_exists('is_error', $result)) {
$result['is_error'] = 0;
}
}
else {
$result = self::error('Could not interpret return values from function.');
}
if (!empty($requestParams['json'])) {
if (!empty($requestParams['prettyprint'])) {
// Don't set content-type header for api explorer output
return self::jsonFormated(array_merge($result));
}
CRM_Utils_System::setHttpHeader('Content-Type', 'application/json');
return json_encode(array_merge($result));
}
if (isset($result['count'])) {
$count = ' count="' . $result['count'] . '" ';
}
else {
$count = "";
}
$xml = "<?xml version=\"1.0\"?>
<ResultSet xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" $count>
";
// check if this is a single element result (contact_get etc)
// or multi element
if ($hier) {
foreach ($result['values'] as $k => $v) {
if (is_array($v)) {
$xml .= "<Result>\n" . CRM_Utils_Array::xml($v) . "</Result>\n";
}
elseif (!is_object($v)) {
$xml .= "<Result>\n<id>{$k}</id><value>{$v}</value></Result>\n";
}
}
}
else {
$xml .= "<Result>\n" . CRM_Utils_Array::xml($result) . "</Result>\n";
}
$xml .= "</ResultSet>\n";
return $xml;
}
/**
* @param $data
*
* @deprecated - switch to native JSON_PRETTY_PRINT when we drop support for php 5.3
*
* @return string
*/
public static function jsonFormated($data) {
// If php is 5.4+ we can use the native method
if (defined('JSON_PRETTY_PRINT')) {
return json_encode($data, JSON_PRETTY_PRINT + JSON_UNESCAPED_SLASHES + JSON_UNESCAPED_UNICODE);
}
// PHP 5.3 shim
$json = str_replace('\/', '/', json_encode($data));
$tabcount = 0;
$result = '';
$inquote = FALSE;
$inarray = FALSE;
$ignorenext = FALSE;
$tab = "\t";
$newline = "\n";
for ($i = 0; $i < strlen($json); $i++) {
$char = $json[$i];
if ($ignorenext) {
$result .= $char;
$ignorenext = FALSE;
}
else {
switch ($char) {
case '{':
if ($inquote) {
$result .= $char;
}
else {
$inarray = FALSE;
$tabcount++;
$result .= $char . $newline . str_repeat($tab, $tabcount);
}
break;
case '}':
if ($inquote) {
$result .= $char;
}
else {
$tabcount--;
$result = trim($result) . $newline . str_repeat($tab, $tabcount) . $char;
}
break;
case ',':
if ($inquote || $inarray) {
$result .= $char;
}
else {
$result .= $char . $newline . str_repeat($tab, $tabcount);
}
break;
case '"':
$inquote = !$inquote;
$result .= $char;
break;
case '\\':
if ($inquote) {
$ignorenext = TRUE;
}
$result .= $char;
break;
case '[':
$inarray = TRUE;
$result .= $char;
break;
case ']':
$inarray = FALSE;
$result .= $char;
break;
default:
$result .= $char;
}
}
}
return $result;
}
/**
* @return array|int
*/
public static function handle() {
$requestParams = CRM_Utils_Request::exportValues();
// Get the function name being called from the q parameter in the query string
$q = CRM_Utils_Array::value('q', $requestParams);
// or for the rest interface, from fnName
$r = CRM_Utils_Array::value('fnName', $requestParams);
if (!empty($r)) {
$q = $r;
}
$entity = CRM_Utils_Array::value('entity', $requestParams);
if (empty($entity) && !empty($q)) {
$args = explode('/', $q);
// If the function isn't in the civicrm namespace, reject the request.
if ($args[0] != 'civicrm') {
return self::error('Unknown function invocation.');
}
// If the query string is malformed, reject the request.
// Does this mean it will reject it
if ((count($args) != 3) && ($args[1] != 'ping')) {
return self::error('Unknown function invocation.');
}
$store = NULL;
if ($args[1] == 'ping') {
return self::ping();
}
}
else {
// or the api format (entity+action)
$args = array();
$args[0] = 'civicrm';
$args[1] = CRM_Utils_Array::value('entity', $requestParams);
$args[2] = CRM_Utils_Array::value('action', $requestParams);
}
// Everyone should be required to provide the server key, so the whole
// interface can be disabled in more change to the configuration file.
// first check for civicrm site key
if (!CRM_Utils_System::authenticateKey(FALSE)) {
$docLink = CRM_Utils_System::docURL2("Managing Scheduled Jobs", TRUE, NULL, NULL, NULL, "wiki");
$key = CRM_Utils_Array::value('key', $requestParams);
if (empty($key)) {
return self::error("FATAL: mandatory param 'key' missing. More info at: " . $docLink);
}
return self::error("FATAL: 'key' is incorrect. More info at: " . $docLink);
}
// At this point we know we are not calling ping which does not require authentication.
// Therefore we now need a valid server key and API key.
// Check and see if a valid secret API key is provided.
$api_key = CRM_Utils_Request::retrieve('api_key', 'String', $store, FALSE, NULL, 'REQUEST');
if (!$api_key || strtolower($api_key) == 'null') {
return self::error("FATAL: mandatory param 'api_key' (user key) missing");
}
$valid_user = CRM_Core_DAO::getFieldValue('CRM_Contact_DAO_Contact', $api_key, 'id', 'api_key');
// If we didn't find a valid user, die
if (empty($valid_user)) {
return self::error("User API key invalid");
}
return self::process($args, self::buildParamList());
}
/**
* @param $args
* @param array $params
*
* @return array|int
*/
public static function process(&$args, $params) {
$params['check_permissions'] = TRUE;
$fnName = $apiFile = NULL;
// clean up all function / class names. they should be alphanumeric and _ only
for ($i = 1; $i <= 3; $i++) {
if (!empty($args[$i])) {
$args[$i] = CRM_Utils_String::munge($args[$i]);
}
}
// incase of ajax functions className is passed in url
if (isset($params['className'])) {
$params['className'] = CRM_Utils_String::munge($params['className']);
// functions that are defined only in AJAX.php can be called via
// rest interface
if (!CRM_Core_Page_AJAX::checkAuthz('method', $params['className'], $params['fnName'])) {
return self::error('Unknown function invocation.');
}
return call_user_func(array($params['className'], $params['fnName']), $params);
}
if (!array_key_exists('version', $params)) {
$params['version'] = 3;
}
if ($params['version'] == 2) {
$result['is_error'] = 1;
$result['error_message'] = "FATAL: API v2 not accessible from ajax/REST";
$result['deprecated'] = "Please upgrade to API v3";
return $result;
}
if ($_SERVER['REQUEST_METHOD'] == 'GET' &&
strtolower(substr($args[2], 0, 3)) != 'get' &&
strtolower($args[2] != 'check')) {
// get only valid for non destructive methods
require_once 'api/v3/utils.php';
return civicrm_api3_create_error("SECURITY: All requests that modify the database must be http POST, not GET.",
array(
'IP' => $_SERVER['REMOTE_ADDR'],
'level' => 'security',
'referer' => $_SERVER['HTTP_REFERER'],
'reason' => 'Destructive HTTP GET',
)
);
}
// trap all fatal errors
$errorScope = CRM_Core_TemporaryErrorScope::create(array('CRM_Utils_REST', 'fatal'));
$result = civicrm_api($args[1], $args[2], $params);
unset($errorScope);
if ($result === FALSE) {
return self::error('Unknown error.');
}
return $result;
}
/**
* @return array|mixed|null
*/
public static function &buildParamList() {
$requestParams = CRM_Utils_Request::exportValues();
$params = array();
$skipVars = array(
'q' => 1,
'json' => 1,
'key' => 1,
'api_key' => 1,
'entity' => 1,
'action' => 1,
);
if (array_key_exists('json', $requestParams) && $requestParams['json'][0] == "{") {
$params = json_decode($requestParams['json'], TRUE);
if ($params === NULL) {
CRM_Utils_JSON::output(array('is_error' => 1, 'error_message', 'Unable to decode supplied JSON.'));
}
}
foreach ($requestParams as $n => $v) {
if (!array_key_exists($n, $skipVars)) {
$params[$n] = $v;
}
}
if (array_key_exists('return', $requestParams) && is_array($requestParams['return'])) {
foreach ($requestParams['return'] as $key => $v) {
$params['return.' . $key] = 1;
}
}
return $params;
}
/**
* @param $pearError
*/
public static function fatal($pearError) {
CRM_Utils_System::setHttpHeader('Content-Type', 'text/xml');
$error = array();
$error['code'] = $pearError->getCode();
$error['error_message'] = $pearError->getMessage();
$error['mode'] = $pearError->getMode();
$error['debug_info'] = $pearError->getDebugInfo();
$error['type'] = $pearError->getType();
$error['user_info'] = $pearError->getUserInfo();
$error['to_string'] = $pearError->toString();
$error['is_error'] = 1;
echo self::output($error);
CRM_Utils_System::civiExit();
}
/**
* used to load a template "inline", eg. for ajax, without having to build a menu for each template
*/
public static function loadTemplate() {
$request = CRM_Utils_Request::retrieve('q', 'String');
if (FALSE !== strpos($request, '..')) {
die ("SECURITY FATAL: the url can't contain '..'. Please report the issue on the forum at civicrm.org");
}
$request = explode('/', $request);
$entity = _civicrm_api_get_camel_name($request[2]);
$tplfile = _civicrm_api_get_camel_name($request[3]);
$tpl = 'CRM/' . $entity . '/Page/Inline/' . $tplfile . '.tpl';
$smarty = CRM_Core_Smarty::singleton();
CRM_Utils_System::setTitle("$entity::$tplfile inline $tpl");
if (!$smarty->template_exists($tpl)) {
CRM_Utils_System::setHttpHeader("Status", "404 Not Found");
die ("Can't find the requested template file templates/$tpl");
}
if (array_key_exists('id', $_GET)) {// special treatmenent, because it's often used
$smarty->assign('id', (int) $_GET['id']);// an id is always positive
}
$pos = strpos(implode(array_keys($_GET)), '<');
if ($pos !== FALSE) {
die ("SECURITY FATAL: one of the param names contains &lt;");
}
$param = array_map('htmlentities', $_GET);
unset($param['q']);
$smarty->assign_by_ref("request", $param);
if (!array_key_exists('HTTP_X_REQUESTED_WITH', $_SERVER) ||
$_SERVER['HTTP_X_REQUESTED_WITH'] != "XMLHttpRequest"
) {
$smarty->assign('tplFile', $tpl);
$config = CRM_Core_Config::singleton();
$content = $smarty->fetch('CRM/common/' . strtolower($config->userFramework) . '.tpl');
if (!defined('CIVICRM_UF_HEAD') && $region = CRM_Core_Region::instance('html-header', FALSE)) {
CRM_Utils_System::addHTMLHead($region->render(''));
}
CRM_Utils_System::appendTPLFile($tpl, $content);
return CRM_Utils_System::theme($content);
}
else {
$content = "<!-- .tpl file embedded: $tpl -->\n";
CRM_Utils_System::appendTPLFile($tpl, $content);
echo $content . $smarty->fetch($tpl);
CRM_Utils_System::civiExit();
}
}
/**
* This is a wrapper so you can call an api via json (it returns json too)
* http://example.org/civicrm/api/json?entity=Contact&action=Get"&json={"contact_type":"Individual","email.get.email":{}}
* to take all the emails from individuals.
* Works for POST & GET (POST recommended).
*/
public static function ajaxJson() {
$requestParams = CRM_Utils_Request::exportValues();
require_once 'api/v3/utils.php';
$config = CRM_Core_Config::singleton();
if (!$config->debug && (!array_key_exists('HTTP_X_REQUESTED_WITH', $_SERVER) ||
$_SERVER['HTTP_X_REQUESTED_WITH'] != "XMLHttpRequest"
)
) {
$error = civicrm_api3_create_error("SECURITY ALERT: Ajax requests can only be issued by javascript clients, eg. CRM.api3().",
array(
'IP' => $_SERVER['REMOTE_ADDR'],
'level' => 'security',
'referer' => $_SERVER['HTTP_REFERER'],
'reason' => 'CSRF suspected',
)
);
CRM_Utils_JSON::output($error);
}
if (empty($requestParams['entity'])) {
CRM_Utils_JSON::output(civicrm_api3_create_error('missing entity param'));
}
if (empty($requestParams['entity'])) {
CRM_Utils_JSON::output(civicrm_api3_create_error('missing entity entity'));
}
if (!empty($requestParams['json'])) {
$params = json_decode($requestParams['json'], TRUE);
}
$entity = CRM_Utils_String::munge(CRM_Utils_Array::value('entity', $requestParams));
$action = CRM_Utils_String::munge(CRM_Utils_Array::value('action', $requestParams));
if (!is_array($params)) {
CRM_Utils_JSON::output(array(
'is_error' => 1,
'error_message' => 'invalid json format: ?{"param_with_double_quote":"value"}',
));
}
$params['check_permissions'] = TRUE;
$params['version'] = 3;
$_GET['json'] = $requestParams['json'] = 1; // $requestParams is local-only; this line seems pointless unless there's a side-effect influencing other functions
if (!$params['sequential']) {
$params['sequential'] = 1;
}
// trap all fatal errors
$errorScope = CRM_Core_TemporaryErrorScope::create(array('CRM_Utils_REST', 'fatal'));
$result = civicrm_api($entity, $action, $params);
unset($errorScope);
echo self::output($result);
CRM_Utils_System::civiExit();
}
/**
* Run ajax request.
*
* @return array
*/
public static function ajax() {
$requestParams = CRM_Utils_Request::exportValues();
// this is driven by the menu system, so we can use permissioning to
// restrict calls to this etc
// the request has to be sent by an ajax call. First line of protection against csrf
$config = CRM_Core_Config::singleton();
if (!$config->debug &&
(!array_key_exists('HTTP_X_REQUESTED_WITH', $_SERVER) ||
$_SERVER['HTTP_X_REQUESTED_WITH'] != "XMLHttpRequest"
)
) {
require_once 'api/v3/utils.php';
$error = civicrm_api3_create_error("SECURITY ALERT: Ajax requests can only be issued by javascript clients, eg. CRM.api3().",
array(
'IP' => $_SERVER['REMOTE_ADDR'],
'level' => 'security',
'referer' => $_SERVER['HTTP_REFERER'],
'reason' => 'CSRF suspected',
)
);
CRM_Utils_JSON::output($error);
}
$q = CRM_Utils_Array::value('fnName', $requestParams);
if (!$q) {
$entity = CRM_Utils_Array::value('entity', $requestParams);
$action = CRM_Utils_Array::value('action', $requestParams);
if (!$entity || !$action) {
$err = array('error_message' => 'missing mandatory params "entity=" or "action="', 'is_error' => 1);
echo self::output($err);
CRM_Utils_System::civiExit();
}
$args = array('civicrm', $entity, $action);
}
else {
$args = explode('/', $q);
}
// get the class name, since all ajax functions pass className
$className = CRM_Utils_Array::value('className', $requestParams);
// If the function isn't in the civicrm namespace, reject the request.
if (($args[0] != 'civicrm' && count($args) != 3) && !$className) {
return self::error('Unknown function invocation.');
}
// Support for multiple api calls
if (isset($entity) && $entity === 'api3') {
$result = self::processMultiple();
}
else {
$result = self::process($args, self::buildParamList());
}
echo self::output($result);
CRM_Utils_System::civiExit();
}
/**
* Callback for multiple ajax api calls from CRM.api3()
* @return array
*/
public static function processMultiple() {
$output = array();
foreach (json_decode($_REQUEST['json'], TRUE) as $key => $call) {
$args = array(
'civicrm',
$call[0],
$call[1],
);
$output[$key] = self::process($args, CRM_Utils_Array::value(2, $call, array()));
}
return $output;
}
/**
* @return array|NULL
* NULL if execution should proceed; array if the response is already known
*/
public function loadCMSBootstrap() {
$requestParams = CRM_Utils_Request::exportValues();
$q = CRM_Utils_Array::value('q', $requestParams);
$args = explode('/', $q);
// Proceed with bootstrap for "?entity=X&action=Y"
// Proceed with bootstrap for "?q=civicrm/X/Y" but not "?q=civicrm/ping"
if (!empty($q)) {
if (count($args) == 2 && $args[1] == 'ping') {
CRM_Utils_System::loadBootStrap(array(), FALSE, FALSE);
return NULL; // this is pretty wonky but maybe there's some reason I can't see
}
if (count($args) != 3) {
return self::error('ERROR: Malformed REST path');
}
if ($args[0] != 'civicrm') {
return self::error('ERROR: Malformed REST path');
}
// Therefore we have reasonably well-formed "?q=civicrm/X/Y"
}
if (!CRM_Utils_System::authenticateKey(FALSE)) {
// FIXME: At time of writing, this doesn't actually do anything because
// authenticateKey abends, but that's a bad behavior which sends a
// malformed response.
CRM_Utils_System::loadBootStrap(array(), FALSE, FALSE);
return self::error('Failed to authenticate key');
}
$uid = NULL;
if (!$uid) {
$store = NULL;
$api_key = CRM_Utils_Request::retrieve('api_key', 'String', $store, FALSE, NULL, 'REQUEST');
if (empty($api_key)) {
CRM_Utils_System::loadBootStrap(array(), FALSE, FALSE);
return self::error("FATAL: mandatory param 'api_key' (user key) missing");
}
$contact_id = CRM_Core_DAO::getFieldValue('CRM_Contact_DAO_Contact', $api_key, 'id', 'api_key');
if ($contact_id) {
$uid = CRM_Core_BAO_UFMatch::getUFId($contact_id);
}
}
if ($uid && $contact_id) {
CRM_Utils_System::loadBootStrap(array('uid' => $uid), TRUE, FALSE);
$session = CRM_Core_Session::singleton();
$session->set('ufID', $uid);
$session->set('userID', $contact_id);
CRM_Core_DAO::executeQuery('SET @civicrm_user_id = %1',
array(1 => array($contact_id, 'Integer'))
);
return NULL;
}
else {
CRM_Utils_System::loadBootStrap(array(), FALSE, FALSE);
return self::error('ERROR: No CMS user associated with given api-key');
}
}
}