friendica_2021-01/include/api.php

<?php
/**
 * Friendica implementation of statusnet/twitter API
 *
 * @file include/api.php
 * @todo Automatically detect if incoming data is HTML or BBCode
 */
use Friendica\App;
use Friendica\Content\ContactSelector;
use Friendica\Content\Feature;
use Friendica\Core\System;
use Friendica\Core\Config;
use Friendica\Core\NotificationsManager;
use Friendica\Core\PConfig;
use Friendica\Core\Worker;
use Friendica\Database\DBM;
use Friendica\Model\Contact;
use Friendica\Model\Group;
use Friendica\Model\Photo;
use Friendica\Model\User;
use Friendica\Network\FKOAuth1;
use Friendica\Network\HTTPException;
use Friendica\Network\HTTPException\BadRequestException;
use Friendica\Network\HTTPException\ForbiddenException;
use Friendica\Network\HTTPException\InternalServerErrorException;
use Friendica\Network\HTTPException\MethodNotAllowedException;
use Friendica\Network\HTTPException\NotFoundException;
use Friendica\Network\HTTPException\NotImplementedException;
use Friendica\Network\HTTPException\UnauthorizedException;
use Friendica\Network\HTTPException\TooManyRequestsException;
use Friendica\Object\Image;
use Friendica\Protocol\Diaspora;
use Friendica\Util\XML;

require_once 'include/bbcode.php';
require_once 'include/datetime.php';
require_once 'include/conversation.php';
require_once 'include/html2plain.php';
require_once 'mod/share.php';
require_once 'mod/item.php';
require_once 'include/security.php';
require_once 'include/html2bbcode.php';
require_once 'mod/wall_upload.php';
require_once 'mod/proxy.php';
require_once 'include/message.php';
require_once 'include/like.php';
require_once 'include/plaintext.php';

define('API_METHOD_ANY', '*');
define('API_METHOD_GET', 'GET');
define('API_METHOD_POST', 'POST,PUT');
define('API_METHOD_DELETE', 'POST,DELETE');

$API = array();
$called_api = null;

/**
 * It is not sufficient to use local_user() to check whether someone is allowed to use the API,
 * because this will open CSRF holes (just embed an image with src=friendicasite.com/api/statuses/update?status=CSRF
 * into a page, and visitors will post something without noticing it).
 *
 * @brief Auth API user
 */
function api_user()
{
	if (x($_SESSION, 'allow_api')) {
		return local_user();
	}

	return false;
}

/**
 * Clients can send 'source' parameter to be show in post metadata
 * as "sent via <source>".
 * Some clients doesn't send a source param, we support ones we know
 * (only Twidere, atm)
 *
 * @brief Get source name from API client
 *
 * @return string
 * 		Client source name, default to "api" if unset/unknown
 */
function api_source()
{
	if (requestdata('source')) {
		return requestdata('source');
	}

	// Support for known clients that doesn't send a source name
	if (strpos($_SERVER['HTTP_USER_AGENT'], "Twidere") !== false) {
		return "Twidere";
	}

	logger("Unrecognized user-agent ".$_SERVER['HTTP_USER_AGENT'], LOGGER_DEBUG);

	return "api";
}

/**
 * @brief Format date for API
 *
 * @param string $str Source date, as UTC
 * @return string Date in UTC formatted as "D M d H:i:s +0000 Y"
 */
function api_date($str)
{
	// Wed May 23 06:01:13 +0000 2007
	return datetime_convert('UTC', 'UTC', $str, "D M d H:i:s +0000 Y");
}

/**
 * Register a function to be the endpoint for defined API path.
 *
 * @brief Register API endpoint
 *
 * @param string $path   API URL path, relative to System::baseUrl()
 * @param string $func   Function name to call on path request
 * @param bool   $auth   API need logged user
 * @param string $method HTTP method reqiured to call this endpoint.
 *                       One of API_METHOD_ANY, API_METHOD_GET, API_METHOD_POST.
 *                       Default to API_METHOD_ANY
 */
function api_register_func($path, $func, $auth = false, $method = API_METHOD_ANY)
{
	global $API;

	$API[$path] = array(
		'func'   => $func,
		'auth'   => $auth,
		'method' => $method,
	);

	// Workaround for hotot
	$path = str_replace("api/", "api/1.1/", $path);

	$API[$path] = array(
		'func'   => $func,
		'auth'   => $auth,
		'method' => $method,
	);
}

/**
 * Log in user via OAuth1 or Simple HTTP Auth.
 * Simple Auth allow username in form of <pre>user@server</pre>, ignoring server part
 *
 * @brief Login API user
 *
 * @param object $a App
 * @hook 'authenticate'
 * 		array $addon_auth
 *			'username' => username from login form
 *			'password' => password from login form
 *			'authenticated' => return status,
 *			'user_record' => return authenticated user record
 * @hook 'logged_in'
 * 		array $user	logged user record
 */
function api_login(App $a)
{
	$oauth1 = new FKOAuth1();
	// login with oauth
	try {
		list($consumer, $token) = $oauth1->verify_request(OAuthRequest::from_request());
		if (!is_null($token)) {
			$oauth1->loginUser($token->uid);
			call_hooks('logged_in', $a->user);
			return;
		}
		echo __FILE__.__LINE__.__FUNCTION__ . "<pre>";
		var_dump($consumer, $token);
		die();
	} catch (Exception $e) {
		logger($e);
	}

	// workaround for HTTP-auth in CGI mode
	if (x($_SERVER, 'REDIRECT_REMOTE_USER')) {
		$userpass = base64_decode(substr($_SERVER["REDIRECT_REMOTE_USER"], 6)) ;
		if (strlen($userpass)) {
			list($name, $password) = explode(':', $userpass);
			$_SERVER['PHP_AUTH_USER'] = $name;
			$_SERVER['PHP_AUTH_PW'] = $password;
		}
	}

	if (!x($_SERVER, 'PHP_AUTH_USER')) {
		logger('API_login: ' . print_r($_SERVER, true), LOGGER_DEBUG);
		header('WWW-Authenticate: Basic realm="Friendica"');
		throw new UnauthorizedException("This API requires login");
	}

	$user = $_SERVER['PHP_AUTH_USER'];
	$password = $_SERVER['PHP_AUTH_PW'];

	// allow "user@server" login (but ignore 'server' part)
	$at = strstr($user, "@", true);
	if ($at) {
		$user = $at;
	}

	// next code from mod/auth.php. needs better solution
	$record = null;

	$addon_auth = array(
		'username' => trim($user),
		'password' => trim($password),
		'authenticated' => 0,
		'user_record' => null,
	);

	/*
		* A plugin indicates successful login by setting 'authenticated' to non-zero value and returning a user record
		* Plugins should never set 'authenticated' except to indicate success - as hooks may be chained
		* and later plugins should not interfere with an earlier one that succeeded.
		*/
	call_hooks('authenticate', $addon_auth);

	if ($addon_auth['authenticated'] && count($addon_auth['user_record'])) {
		$record = $addon_auth['user_record'];
	} else {
		$user_id = User::authenticate(trim($user), trim($password));
		if ($user_id) {
			$record = dba::selectFirst('user', [], ['uid' => $user_id]);
		}
	}

	if (!$record || !count($record)) {
		logger('API_login failure: ' . print_r($_SERVER, true), LOGGER_DEBUG);
		header('WWW-Authenticate: Basic realm="Friendica"');
		//header('HTTP/1.0 401 Unauthorized');
		//die('This api requires login');
		throw new UnauthorizedException("This API requires login");
	}

	authenticate_success($record);

	$_SESSION["allow_api"] = true;

	call_hooks('logged_in', $a->user);
}

/**
 * API endpoints can define which HTTP method to accept when called.
 * This function check the current HTTP method agains endpoint
 * registered method.
 *
 * @brief Check HTTP method of called API
 *
 * @param string $method Required methods, uppercase, separated by comma
 * @return bool
 */
function api_check_method($method)
{
	if ($method == "*") {
		return true;
	}
	return (strpos($method, $_SERVER['REQUEST_METHOD']) !== false);
}

/**
 * Authenticate user, call registered API function, set HTTP headers
 *
 * @brief Main API entry point
 *
 * @param object $a App
 * @return string API call result
 */
function api_call(App $a)
{
	global $API, $called_api;

	$type = "json";
	if (strpos($a->query_string, ".xml") > 0) {
		$type = "xml";
	}
	if (strpos($a->query_string, ".json") > 0) {
		$type = "json";
	}
	if (strpos($a->query_string, ".rss") > 0) {
		$type = "rss";
	}
	if (strpos($a->query_string, ".atom") > 0) {
		$type = "atom";
	}

	try {
		foreach ($API as $p => $info) {
			if (strpos($a->query_string, $p) === 0) {
				if (!api_check_method($info['method'])) {
					throw new MethodNotAllowedException();
				}

				$called_api = explode("/", $p);
				//unset($_SERVER['PHP_AUTH_USER']);

				/// @TODO should be "true ==[=] $info['auth']", if you miss only one = character, you assign a variable (only with ==). Let's make all this even.
				if ($info['auth'] === true && api_user() === false) {
					api_login($a);
				}

				logger('API call for ' . $a->user['username'] . ': ' . $a->query_string);
				logger('API parameters: ' . print_r($_REQUEST, true));

				$stamp =  microtime(true);
				$return = call_user_func($info['func'], $type);
				$duration = (float) (microtime(true) - $stamp);
				logger("API call duration: " . round($duration, 2) . "\t" . $a->query_string, LOGGER_DEBUG);

				if (Config::get("system", "profiler")) {
					$duration = microtime(true)-$a->performance["start"];

					/// @TODO round() really everywhere?
					logger(
						parse_url($a->query_string, PHP_URL_PATH) . ": " . sprintf(
							"Database: %s/%s, Network: %s, I/O: %s, Other: %s, Total: %s",
							round($a->performance["database"] - $a->performance["database_write"], 3),
							round($a->performance["database_write"], 3),
							round($a->performance["network"], 2),
							round($a->performance["file"], 2),
							round($duration - ($a->performance["database"] + $a->performance["network"]	+ $a->performance["file"]), 2),
							round($duration, 2)
						),
						LOGGER_DEBUG
					);

					if (Config::get("rendertime", "callstack")) {
						$o = "Database Read:\n";
						foreach ($a->callstack["database"] as $func => $time) {
							$time = round($time, 3);
							if ($time > 0) {
								$o .= $func . ": " . $time . "\n";
							}
						}
						$o .= "\nDatabase Write:\n";
						foreach ($a->callstack["database_write"] as $func => $time) {
							$time = round($time, 3);
							if ($time > 0) {
								$o .= $func . ": " . $time . "\n";
							}
						}

						$o .= "\nNetwork:\n";
						foreach ($a->callstack["network"] as $func => $time) {
							$time = round($time, 3);
							if ($time > 0) {
								$o .= $func . ": " . $time . "\n";
							}
						}
						logger($o, LOGGER_DEBUG);
					}
				}

				if (false === $return) {
					/*
						* api function returned false withour throw an
						* exception. This should not happend, throw a 500
						*/
					throw new InternalServerErrorException();
				}

				switch ($type) {
					case "xml":
						header("Content-Type: text/xml");
						break;
					case "json":
						header("Content-Type: application/json");
						foreach ($return as $rr) {
							$json = json_encode($rr);
						}
						if (x($_GET, 'callback')) {
							$json = $_GET['callback'] . "(" . $json . ")";
						}
						$return = $json;
						break;
					case "rss":
						header("Content-Type: application/rss+xml");
						$return  = '<?xml version="1.0" encoding="UTF-8"?>' . "\n" . $return;
						break;
					case "atom":
						header("Content-Type: application/atom+xml");
						$return = '<?xml version="1.0" encoding="UTF-8"?>' . "\n" . $return;
						break;
				}
				return $return;
			}
		}

		logger('API call not implemented: ' . $a->query_string);
		throw new NotImplementedException();
	} catch (HTTPException $e) {
		header("HTTP/1.1 {$e->httpcode} {$e->httpdesc}");
		return api_error($type, $e);
	}
}

/**
 * @brief Format API error string
 *
 * @param string $type Return type (xml, json, rss, as)
 * @param object $e    HTTPException Error object
 * @return string error message formatted as $type
 */
function api_error($type, $e)
{
	$a = get_app();

	$error = ($e->getMessage() !== "" ? $e->getMessage() : $e->httpdesc);
	/// @TODO:  https://dev.twitter.com/overview/api/response-codes

	$error = array("error" => $error,
			"code" => $e->httpcode . " " . $e->httpdesc,
			"request" => $a->query_string);

	$return = api_format_data('status', $type, array('status' => $error));

	switch ($type) {
		case "xml":
			header("Content-Type: text/xml");
			break;
		case "json":
			header("Content-Type: application/json");
			$return = json_encode($return);
			break;
		case "rss":
			header("Content-Type: application/rss+xml");
			break;
		case "atom":
			header("Content-Type: application/atom+xml");
			break;
	}

	return $return;
}

/**
 * @brief Set values for RSS template
 *
 * @param App $a
 * @param array $arr       Array to be passed to template
 * @param array $user_info User info
 * @return array
 * @todo find proper type-hints
 */
function api_rss_extra(App $a, $arr, $user_info)
{
	if (is_null($user_info)) {
		$user_info = api_get_user($a);
	}

	$arr['$user'] = $user_info;
	$arr['$rss'] = array(
		'alternate'    => $user_info['url'],
		'self'         => System::baseUrl() . "/" . $a->query_string,
		'base'         => System::baseUrl(),
		'updated'      => api_date(null),
		'atom_updated' => datetime_convert('UTC', 'UTC', 'now', ATOM_TIME),
		'language'     => $user_info['language'],
		'logo'         => System::baseUrl() . "/images/friendica-32.png",
	);

	return $arr;
}


/**
 * @brief Unique contact to contact url.
 *
 * @param int $id Contact id
 * @return bool|string
 * 		Contact url or False if contact id is unknown
 */
function api_unique_id_to_nurl($id)
{
	$r = dba::selectFirst('contact', array('nurl'), array('uid' => 0, 'id' => $id));

	if (DBM::is_result($r)) {
		return $r["nurl"];
	} else {
		return false;
	}
}

/**
 * @brief Get user info array.
 *
 * @param object     $a          App
 * @param int|string $contact_id Contact ID or URL
 */
function api_get_user(App $a, $contact_id = null)
{
	global $called_api;

	$user = null;
	$extra_query = "";
	$url = "";

	logger("api_get_user: Fetching user data for user ".$contact_id, LOGGER_DEBUG);

	// Searching for contact URL
	if (!is_null($contact_id) && (intval($contact_id) == 0)) {
		$user = dbesc(normalise_link($contact_id));
		$url = $user;
		$extra_query = "AND `contact`.`nurl` = '%s' ";
		if (api_user() !== false) {
			$extra_query .= "AND `contact`.`uid`=" . intval(api_user());
		}
	}

	// Searching for contact id with uid = 0
	if (!is_null($contact_id) && (intval($contact_id) != 0)) {
		$user = dbesc(api_unique_id_to_nurl($contact_id));

		if ($user == "") {
			throw new BadRequestException("User not found.");
		}

		$url = $user;
		$extra_query = "AND `contact`.`nurl` = '%s' ";
		if (api_user() !== false) {
			$extra_query .= "AND `contact`.`uid`=" . intval(api_user());
		}
	}

	if (is_null($user) && x($_GET, 'user_id')) {
		$user = dbesc(api_unique_id_to_nurl($_GET['user_id']));

		if ($user == "") {
			throw new BadRequestException("User not found.");
		}

		$url = $user;
		$extra_query = "AND `contact`.`nurl` = '%s' ";
		if (api_user() !== false) {
			$extra_query .= "AND `contact`.`uid`=" . intval(api_user());
		}
	}
	if (is_null($user) && x($_GET, 'screen_name')) {
		$user = dbesc($_GET['screen_name']);
		$extra_query = "AND `contact`.`nick` = '%s' ";
		if (api_user() !== false) {
			$extra_query .= "AND `contact`.`uid`=".intval(api_user());
		}
	}

	if (is_null($user) && x($_GET, 'profileurl')) {
		$user = dbesc(normalise_link($_GET['profileurl']));
		$extra_query = "AND `contact`.`nurl` = '%s' ";
		if (api_user() !== false) {
			$extra_query .= "AND `contact`.`uid`=".intval(api_user());
		}
	}

	if (is_null($user) && ($a->argc > (count($called_api) - 1)) && (count($called_api) > 0)) {
		$argid = count($called_api);
		list($user, $null) = explode(".", $a->argv[$argid]);
		if (is_numeric($user)) {
			$user = dbesc(api_unique_id_to_nurl($user));

			if ($user == "") {
				return false;
			}

			$url = $user;
			$extra_query = "AND `contact`.`nurl` = '%s' ";
			if (api_user() !== false) {
				$extra_query .= "AND `contact`.`uid`=" . intval(api_user());
			}
		} else {
			$user = dbesc($user);
			$extra_query = "AND `contact`.`nick` = '%s' ";
			if (api_user() !== false) {
				$extra_query .= "AND `contact`.`uid`=" . intval(api_user());
			}
		}
	}

	logger("api_get_user: user ".$user, LOGGER_DEBUG);

	if (!$user) {
		if (api_user() === false) {
			api_login($a);
			return false;
		} else {
			$user = $_SESSION['uid'];
			$extra_query = "AND `contact`.`uid` = %d AND `contact`.`self` ";
		}
	}

	logger('api_user: ' . $extra_query . ', user: ' . $user);

	// user info
	$uinfo = q(
		"SELECT *, `contact`.`id` AS `cid` FROM `contact`
			WHERE 1
		$extra_query",
		$user
	);

	// Selecting the id by priority, friendica first
	api_best_nickname($uinfo);

	// if the contact wasn't found, fetch it from the contacts with uid = 0
	if (!DBM::is_result($uinfo)) {
		$r = array();

		if ($url != "") {
			$r = q("SELECT * FROM `contact` WHERE `uid` = 0 AND `nurl` = '%s' LIMIT 1", dbesc(normalise_link($url)));
		}

		if (DBM::is_result($r)) {
			$network_name = ContactSelector::networkToName($r[0]['network'], $r[0]['url']);

			// If no nick where given, extract it from the address
			if (($r[0]['nick'] == "") || ($r[0]['name'] == $r[0]['nick'])) {
				$r[0]['nick'] = api_get_nick($r[0]["url"]);
			}

			$ret = array(
				'id' => $r[0]["id"],
				'id_str' => (string) $r[0]["id"],
				'name' => $r[0]["name"],
				'screen_name' => (($r[0]['nick']) ? $r[0]['nick'] : $r[0]['name']),
				'location' => ($r[0]["location"] != "") ? $r[0]["location"] : $network_name,
				'description' => $r[0]["about"],
				'profile_image_url' => $r[0]["micro"],
				'profile_image_url_https' => $r[0]["micro"],
				'url' => $r[0]["url"],
				'protected' => false,
				'followers_count' => 0,
				'friends_count' => 0,
				'listed_count' => 0,
				'created_at' => api_date($r[0]["created"]),
				'favourites_count' => 0,
				'utc_offset' => 0,
				'time_zone' => 'UTC',
				'geo_enabled' => false,
				'verified' => false,
				'statuses_count' => 0,
				'lang' => '',
				'contributors_enabled' => false,
				'is_translator' => false,
				'is_translation_enabled' => false,
				'following' => false,
				'follow_request_sent' => false,
				'statusnet_blocking' => false,
				'notifications' => false,
				'statusnet_profile_url' => $r[0]["url"],
				'uid' => 0,
				'cid' => Contact::getIdForURL($r[0]["url"], api_user(), true),
				'self' => 0,
				'network' => $r[0]["network"],
			);

			return $ret;
		} else {
			throw new BadRequestException("User not found.");
		}
	}

	if ($uinfo[0]['self']) {
		if ($uinfo[0]['network'] == "") {
			$uinfo[0]['network'] = NETWORK_DFRN;
		}

		$usr = q(
			"SELECT * FROM `user` WHERE `uid` = %d LIMIT 1",
			intval(api_user())
		);
		$profile = q(
			"SELECT * FROM `profile` WHERE `uid` = %d AND `is-default` = 1 LIMIT 1",
			intval(api_user())
		);

		/// @TODO old-lost code? (twice)
		// Counting is deactivated by now, due to performance issues
		// count public wall messages
		//$r = q("SELECT COUNT(*) as `count` FROM `item` WHERE `uid` = %d AND `wall`",
		//		intval($uinfo[0]['uid'])
		//);
		//$countitms = $r[0]['count'];
		$countitms = 0;
	} else {
		// Counting is deactivated by now, due to performance issues
		//$r = q("SELECT count(*) as `count` FROM `item`
		//		WHERE  `contact-id` = %d",
		//		intval($uinfo[0]['id'])
		//);
		//$countitms = $r[0]['count'];
		$countitms = 0;
	}

		/// @TODO old-lost code? (twice)
		/*
		// Counting is deactivated by now, due to performance issues
		// count friends
		$r = q("SELECT count(*) as `count` FROM `contact`
				WHERE  `uid` = %d AND `rel` IN ( %d, %d )
				AND `self`=0 AND NOT `blocked` AND NOT `pending` AND `hidden`=0",
				intval($uinfo[0]['uid']),
				intval(CONTACT_IS_SHARING),
				intval(CONTACT_IS_FRIEND)
		);
		$countfriends = $r[0]['count'];

		$r = q("SELECT count(*) as `count` FROM `contact`
				WHERE  `uid` = %d AND `rel` IN ( %d, %d )
				AND `self`=0 AND NOT `blocked` AND NOT `pending` AND `hidden`=0",
				intval($uinfo[0]['uid']),
				intval(CONTACT_IS_FOLLOWER),
				intval(CONTACT_IS_FRIEND)
		);
		$countfollowers = $r[0]['count'];

		$r = q("SELECT count(*) as `count` FROM item where starred = 1 and uid = %d and deleted = 0",
			intval($uinfo[0]['uid'])
		);
		$starred = $r[0]['count'];


		if (! $uinfo[0]['self']) {
			$countfriends = 0;
			$countfollowers = 0;
			$starred = 0;
		}
		*/
	$countfriends = 0;
	$countfollowers = 0;
	$starred = 0;

	// Add a nick if it isn't present there
	if (($uinfo[0]['nick'] == "") || ($uinfo[0]['name'] == $uinfo[0]['nick'])) {
		$uinfo[0]['nick'] = api_get_nick($uinfo[0]["url"]);
	}

	$network_name = ContactSelector::networkToName($uinfo[0]['network'], $uinfo[0]['url']);

	$pcontact_id  = Contact::getIdForURL($uinfo[0]['url'], 0, true);

	if (!empty($profile[0]['about'])) {
		$description = $profile[0]['about'];
	} else {
		$description = $uinfo[0]["about"];
	}

	if (!empty($usr[0]['default-location'])) {
		$location = $usr[0]['default-location'];
	} elseif (!empty($uinfo[0]["location"])) {
		$location = $uinfo[0]["location"];
	} else {
		$location = $network_name;
	}

	$ret = array(
		'id' => intval($pcontact_id),
		'id_str' => (string) intval($pcontact_id),
		'name' => (($uinfo[0]['name']) ? $uinfo[0]['name'] : $uinfo[0]['nick']),
		'screen_name' => (($uinfo[0]['nick']) ? $uinfo[0]['nick'] : $uinfo[0]['name']),
		'location' => $location,
		'description' => $description,
		'profile_image_url' => $uinfo[0]['micro'],
		'profile_image_url_https' => $uinfo[0]['micro'],
		'url' => $uinfo[0]['url'],
		'protected' => false,
		'followers_count' => intval($countfollowers),
		'friends_count' => intval($countfriends),
		'listed_count' => 0,
		'created_at' => api_date($uinfo[0]['created']),
		'favourites_count' => intval($starred),
		'utc_offset' => "0",
		'time_zone' => 'UTC',
		'geo_enabled' => false,
		'verified' => true,
		'statuses_count' => intval($countitms),
		'lang' => '',
		'contributors_enabled' => false,
		'is_translator' => false,
		'is_translation_enabled' => false,
		'following' => (($uinfo[0]['rel'] == CONTACT_IS_FOLLOWER) || ($uinfo[0]['rel'] == CONTACT_IS_FRIEND)),
		'follow_request_sent' => false,
		'statusnet_blocking' => false,
		'notifications' => false,
		/// @TODO old way?
		//'statusnet_profile_url' => System::baseUrl()."/contacts/".$uinfo[0]['cid'],
		'statusnet_profile_url' => $uinfo[0]['url'],
		'uid' => intval($uinfo[0]['uid']),
		'cid' => intval($uinfo[0]['cid']),
		'self' => $uinfo[0]['self'],
		'network' => $uinfo[0]['network'],
	);

	// If this is a local user and it uses Frio, we can get its color preferences.
	if ($ret['self']) {
		$theme_info = dba::selectFirst('user', ['theme'], ['uid' => $ret['uid']]);
		if ($theme_info['theme'] === 'frio') {
			$schema = PConfig::get($ret['uid'], 'frio', 'schema');
			if ($schema && ($schema != '---')) {
				if (file_exists('view/theme/frio/schema/'.$schema.'.php')) {
					$schemefile = 'view/theme/frio/schema/'.$schema.'.php';
					require_once $schemefile;
				}
			} else {
				$nav_bg = PConfig::get($ret['uid'], 'frio', 'nav_bg');
				$link_color = PConfig::get($ret['uid'], 'frio', 'link_color');
				$bgcolor = PConfig::get($ret['uid'], 'frio', 'background_color');
			}
			if (!$nav_bg) {
				$nav_bg = "#708fa0";
			}
			if (!$link_color) {
				$link_color = "#6fdbe8";
			}
			if (!$bgcolor) {
				$bgcolor = "#ededed";
			}

			$ret['profile_sidebar_fill_color'] = str_replace('#', '', $nav_bg);
			$ret['profile_link_color'] = str_replace('#', '', $link_color);
			$ret['profile_background_color'] = str_replace('#', '', $bgcolor);
		}
	}

	return $ret;
}

/**
 * @brief return api-formatted array for item's author and owner
 *
 * @param object $a    App
 * @param array  $item item from db
 * @return array(array:author, array:owner)
 */
function api_item_get_user(App $a, $item)
{
	$status_user = api_get_user($a, $item["author-link"]);

	$status_user["protected"] = (($item["allow_cid"] != "") ||
					($item["allow_gid"] != "") ||
					($item["deny_cid"] != "") ||
					($item["deny_gid"] != "") ||
					$item["private"]);

	if ($item['thr-parent'] == $item['uri']) {
		$owner_user = api_get_user($a, $item["owner-link"]);
	} else {
		$owner_user = $status_user;
	}

	return (array($status_user, $owner_user));
}

/**
 * @brief walks recursively through an array with the possibility to change value and key
 *
 * @param array  $array    The array to walk through
 * @param string $callback The callback function
 *
 * @return array the transformed array
 */
function api_walk_recursive(array &$array, callable $callback)
{
	$new_array = array();

	foreach ($array as $k => $v) {
		if (is_array($v)) {
			if ($callback($v, $k)) {
				$new_array[$k] = api_walk_recursive($v, $callback);
			}
		} else {
			if ($callback($v, $k)) {
				$new_array[$k] = $v;
			}
		}
	}
	$array = $new_array;

	return $array;
}

/**
 * @brief Callback function to transform the array in an array that can be transformed in a XML file
 *
 * @param mixed  $item Array item value
 * @param string $key  Array key
 *
 * @return boolean Should the array item be deleted?
 */
function api_reformat_xml(&$item, &$key)
{
	if (is_bool($item)) {
		$item = ($item ? "true" : "false");
	}

	if (substr($key, 0, 10) == "statusnet_") {
		$key = "statusnet:".substr($key, 10);
	} elseif (substr($key, 0, 10) == "friendica_") {
		$key = "friendica:".substr($key, 10);
	}
	/// @TODO old-lost code?
	//else
	//	$key = "default:".$key;

	return true;
}

/**
 * @brief Creates the XML from a JSON style array
 *
 * @param array  $data         JSON style array
 * @param string $root_element Name of the root element
 *
 * @return string The XML data
 */
function api_create_xml($data, $root_element)
{
	$childname = key($data);
	$data2 = array_pop($data);
	$key = key($data2);

	$namespaces = array("" => "http://api.twitter.com",
				"statusnet" => "http://status.net/schema/api/1/",
				"friendica" => "http://friendi.ca/schema/api/1/",
				"georss" => "http://www.georss.org/georss");

	/// @todo Auto detection of needed namespaces
	if (in_array($root_element, array("ok", "hash", "config", "version", "ids", "notes", "photos"))) {
		$namespaces = array();
	}

	if (is_array($data2)) {
		api_walk_recursive($data2, "api_reformat_xml");
	}

	if ($key == "0") {
		$data4 = array();
		$i = 1;

		foreach ($data2 as $item) {
			$data4[$i++.":".$childname] = $item;
		}

		$data2 = $data4;
	}

	$data3 = array($root_element => $data2);

	$ret = XML::fromArray($data3, $xml, false, $namespaces);
	return $ret;
}

/**
 * @brief Formats the data according to the data type
 *
 * @param string $root_element Name of the root element
 * @param string $type         Return type (atom, rss, xml, json)
 * @param array  $data         JSON style array
 *
 * @return (string|object|array) XML data or JSON data
 */
function api_format_data($root_element, $type, $data)
{
	switch ($type) {
		case "atom":
		case "rss":
		case "xml":
			$ret = api_create_xml($data, $root_element);
			break;
		case "json":
			$ret = $data;
			break;
	}

	return $ret;
}

/**
 * TWITTER API
 */

/**
 * Returns an HTTP 200 OK response code and a representation of the requesting user if authentication was successful;
 * returns a 401 status code and an error message if not.
 * @see https://developer.twitter.com/en/docs/accounts-and-users/manage-account-settings/api-reference/get-account-verify_credentials
 *
 * @param string $type Return type (atom, rss, xml, json)
 */
function api_account_verify_credentials($type)
{

	$a = get_app();

	if (api_user() === false) {
		throw new ForbiddenException();
	}

	unset($_REQUEST["user_id"]);
	unset($_GET["user_id"]);

	unset($_REQUEST["screen_name"]);
	unset($_GET["screen_name"]);

	$skip_status = (x($_REQUEST, 'skip_status')?$_REQUEST['skip_status'] : false);

	$user_info = api_get_user($a);

	// "verified" isn't used here in the standard
	unset($user_info["verified"]);

	// - Adding last status
	if (!$skip_status) {
		$user_info["status"] = api_status_show("raw");
		if (!count($user_info["status"])) {
			unset($user_info["status"]);
		} else {
			unset($user_info["status"]["user"]);
		}
	}

	// "uid" and "self" are only needed for some internal stuff, so remove it from here
	unset($user_info["uid"]);
	unset($user_info["self"]);

	return api_format_data("user", $type, array('user' => $user_info));
}

/// @TODO move to top of file or somewhere better
api_register_func('api/account/verify_credentials', 'api_account_verify_credentials', true);

/**
 * Get data from $_POST or $_GET
 *
 * @param string $k
 */
function requestdata($k)
{
	if (x($_POST, $k)) {
		return $_POST[$k];
	}
	if (x($_GET, $k)) {
		return $_GET[$k];
	}
	return null;
}

/**
 * Waitman Gobble Mod
 *
 * @param string $type Return type (atom, rss, xml, json)
 *
 * @return array|string
 */
function api_statuses_mediap($type)
{
	$a = get_app();

	if (api_user() === false) {
		logger('api_statuses_update: no user');
		throw new ForbiddenException();
	}
	$user_info = api_get_user($a);

	$_REQUEST['type'] = 'wall';
	$_REQUEST['profile_uid'] = api_user();
	$_REQUEST['api_source'] = true;
	$txt = requestdata('status');
	/// @TODO old-lost code?
	//$txt = urldecode(requestdata('status'));

	if ((strpos($txt, '<') !== false) || (strpos($txt, '>') !== false)) {
		$txt = html2bb_video($txt);
		$config = HTMLPurifier_Config::createDefault();
		$config->set('Cache.DefinitionImpl', null);
		$purifier = new HTMLPurifier($config);
		$txt = $purifier->purify($txt);
	}
	$txt = html2bbcode($txt);

	$a->argv[1]=$user_info['screen_name']; //should be set to username?

	// tell wall_upload function to return img info instead of echo
	$_REQUEST['hush'] = 'yeah';
	$bebop = wall_upload_post($a);

	// now that we have the img url in bbcode we can add it to the status and insert the wall item.
	$_REQUEST['body'] = $txt . "\n\n" . $bebop;
	item_post($a);

	// this should output the last post (the one we just posted).
	return api_status_show($type);
}

/// @TODO move this to top of file or somewhere better!
api_register_func('api/statuses/mediap', 'api_statuses_mediap', true, API_METHOD_POST);

/**
 * Updates the user’s current status.
 *
 * @param string $type Return type (atom, rss, xml, json)
 *
 * @return array|string
 * @see https://developer.twitter.com/en/docs/tweets/post-and-engage/api-reference/post-statuses-update
 */
function api_statuses_update($type)
{

	$a = get_app();

	if (api_user() === false) {
		logger('api_statuses_update: no user');
		throw new ForbiddenException();
	}

	api_get_user($a);

	// convert $_POST array items to the form we use for web posts.
	if (requestdata('htmlstatus')) {
		$txt = requestdata('htmlstatus');
		if ((strpos($txt, '<') !== false) || (strpos($txt, '>') !== false)) {
			$txt = html2bb_video($txt);

			$config = HTMLPurifier_Config::createDefault();
			$config->set('Cache.DefinitionImpl', null);

			$purifier = new HTMLPurifier($config);
			$txt = $purifier->purify($txt);

			$_REQUEST['body'] = html2bbcode($txt);
		}
	} else {
		$_REQUEST['body'] = requestdata('status');
	}

	$_REQUEST['title'] = requestdata('title');

	$parent = requestdata('in_reply_to_status_id');

	// Twidere sends "-1" if it is no reply ...
	if ($parent == -1) {
		$parent = "";
	}

	if (ctype_digit($parent)) {
		$_REQUEST['parent'] = $parent;
	} else {
		$_REQUEST['parent_uri'] = $parent;
	}

	if (requestdata('lat') && requestdata('long')) {
		$_REQUEST['coord'] = sprintf("%s %s", requestdata('lat'), requestdata('long'));
	}
	$_REQUEST['profile_uid'] = api_user();

	if ($parent) {
		$_REQUEST['type'] = 'net-comment';
	} else {
		// Check for throttling (maximum posts per day, week and month)
		$throttle_day = Config::get('system', 'throttle_limit_day');
		if ($throttle_day > 0) {
			$datefrom = date("Y-m-d H:i:s", time() - 24*60*60);

			$r = q(
				"SELECT COUNT(*) AS `posts_day` FROM `item` WHERE `uid`=%d AND `wall`
				AND `created` > '%s' AND `id` = `parent`",
				intval(api_user()),
				dbesc($datefrom)
			);

			if (DBM::is_result($r)) {
				$posts_day = $r[0]["posts_day"];
			} else {
				$posts_day = 0;
			}

			if ($posts_day > $throttle_day) {
				logger('Daily posting limit reached for user '.api_user(), LOGGER_DEBUG);
				// die(api_error($type, sprintf(t("Daily posting limit of %d posts reached. The post was rejected."), $throttle_day)));
				throw new TooManyRequestsException(sprintf(t("Daily posting limit of %d posts reached. The post was rejected."), $throttle_day));
			}
		}

		$throttle_week = Config::get('system', 'throttle_limit_week');
		if ($throttle_week > 0) {
			$datefrom = date("Y-m-d H:i:s", time() - 24*60*60*7);

			$r = q(
				"SELECT COUNT(*) AS `posts_week` FROM `item` WHERE `uid`=%d AND `wall`
				AND `created` > '%s' AND `id` = `parent`",
				intval(api_user()),
				dbesc($datefrom)
			);

			if (DBM::is_result($r)) {
				$posts_week = $r[0]["posts_week"];
			} else {
				$posts_week = 0;
			}

			if ($posts_week > $throttle_week) {
				logger('Weekly posting limit reached for user '.api_user(), LOGGER_DEBUG);
				// die(api_error($type, sprintf(t("Weekly posting limit of %d posts reached. The post was rejected."), $throttle_week)));
				throw new TooManyRequestsException(sprintf(t("Weekly posting limit of %d posts reached. The post was rejected."), $throttle_week));
			}
		}

		$throttle_month = Config::get('system', 'throttle_limit_month');
		if ($throttle_month > 0) {
			$datefrom = date("Y-m-d H:i:s", time() - 24*60*60*30);

			$r = q(
				"SELECT COUNT(*) AS `posts_month` FROM `item` WHERE `uid`=%d AND `wall`
				AND `created` > '%s' AND `id` = `parent`",
				intval(api_user()),
				dbesc($datefrom)
			);

			if (DBM::is_result($r)) {
				$posts_month = $r[0]["posts_month"];
			} else {
				$posts_month = 0;
			}

			if ($posts_month > $throttle_month) {
				logger('Monthly posting limit reached for user '.api_user(), LOGGER_DEBUG);
				// die(api_error($type, sprintf(t("Monthly posting limit of %d posts reached. The post was rejected."), $throttle_month)));
				throw new TooManyRequestsException(sprintf(t("Monthly posting limit of %d posts reached. The post was rejected."), $throttle_month));
			}
		}

		$_REQUEST['type'] = 'wall';
	}

	if (x($_FILES, 'media')) {
		// upload the image if we have one
		$_REQUEST['hush'] = 'yeah'; //tell wall_upload function to return img info instead of echo
		$media = wall_upload_post($a);
		if (strlen($media) > 0) {
			$_REQUEST['body'] .= "\n\n" . $media;
		}
	}

	// To-Do: Multiple IDs
	if (requestdata('media_ids')) {
		$r = q(
			"SELECT `resource-id`, `scale`, `nickname`, `type` FROM `photo` INNER JOIN `user` ON `user`.`uid` = `photo`.`uid` WHERE `resource-id` IN (SELECT `resource-id` FROM `photo` WHERE `id` = %d) AND `scale` > 0 AND `photo`.`uid` = %d ORDER BY `photo`.`width` DESC LIMIT 1",
			intval(requestdata('media_ids')),
			api_user()
		);
		if (DBM::is_result($r)) {
			$phototypes = Image::supportedTypes();
			$ext = $phototypes[$r[0]['type']];
			$_REQUEST['body'] .= "\n\n" . '[url=' . System::baseUrl() . '/photos/' . $r[0]['nickname'] . '/image/' . $r[0]['resource-id'] . ']';
			$_REQUEST['body'] .= '[img]' . System::baseUrl() . '/photo/' . $r[0]['resource-id'] . '-' . $r[0]['scale'] . '.' . $ext . '[/img][/url]';
		}
	}

	// set this so that the item_post() function is quiet and doesn't redirect or emit json

	$_REQUEST['api_source'] = true;

	if (!x($_REQUEST, "source")) {
		$_REQUEST["source"] = api_source();
	}

	// call out normal post function
	item_post($a);

	// this should output the last post (the one we just posted).
	return api_status_show($type);
}

/// @TODO move to top of file or somewhere better
api_register_func('api/statuses/update', 'api_statuses_update', true, API_METHOD_POST);
api_register_func('api/statuses/update_with_media', 'api_statuses_update', true, API_METHOD_POST);

/**
 * Uploads an image to Friendica.
 *
 * @return array
 * @see https://developer.twitter.com/en/docs/media/upload-media/api-reference/post-media-upload
 */
function api_media_upload()
{
	$a = get_app();

	if (api_user() === false) {
		logger('no user');
		throw new ForbiddenException();
	}

	api_get_user($a);

	if (!x($_FILES, 'media')) {
		// Output error
		throw new BadRequestException("No media.");
	}

	$media = wall_upload_post($a, false);
	if (!$media) {
		// Output error
		throw new InternalServerErrorException();
	}

	$returndata = array();
	$returndata["media_id"] = $media["id"];
	$returndata["media_id_string"] = (string)$media["id"];
	$returndata["size"] = $media["size"];
	$returndata["image"] = array("w" => $media["width"],
					"h" => $media["height"],
					"image_type" => $media["type"]);

	logger("Media uploaded: " . print_r($returndata, true), LOGGER_DEBUG);

	return array("media" => $returndata);
}

/// @TODO move to top of file or somewhere better
api_register_func('api/media/upload', 'api_media_upload', true, API_METHOD_POST);

/**
 *
 * @param string $type Return type (atom, rss, xml, json)
 *
 * @return array|string
 */
function api_status_show($type)
{
	$a = get_app();

	$user_info = api_get_user($a);

	logger('api_status_show: user_info: '.print_r($user_info, true), LOGGER_DEBUG);

	if ($type == "raw") {
		$privacy_sql = "AND `item`.`allow_cid`='' AND `item`.`allow_gid`='' AND `item`.`deny_cid`='' AND `item`.`deny_gid`=''";
	} else {
		$privacy_sql = "";
	}

	// get last public wall message
	$lastwall = q(
		"SELECT `item`.*
			FROM `item`
			WHERE `item`.`contact-id` = %d AND `item`.`uid` = %d
				AND ((`item`.`author-link` IN ('%s', '%s')) OR (`item`.`owner-link` IN ('%s', '%s')))
				AND `item`.`type` != 'activity' $privacy_sql
			ORDER BY `item`.`id` DESC
			LIMIT 1",
		intval($user_info['cid']),
		intval(api_user()),
		dbesc($user_info['url']),
		dbesc(normalise_link($user_info['url'])),
		dbesc($user_info['url']),
		dbesc(normalise_link($user_info['url']))
	);

	if (DBM::is_result($lastwall)) {
		$lastwall = $lastwall[0];

		$in_reply_to = api_in_reply_to($lastwall);

		$converted = api_convert_item($lastwall);

		if ($type == "xml") {
			$geo = "georss:point";
		} else {
			$geo = "geo";
		}

		$status_info = array(
			'created_at' => api_date($lastwall['created']),
			'id' => intval($lastwall['id']),
			'id_str' => (string) $lastwall['id'],
			'text' => $converted["text"],
			'source' => (($lastwall['app']) ? $lastwall['app'] : 'web'),
			'truncated' => false,
			'in_reply_to_status_id' => $in_reply_to['status_id'],
			'in_reply_to_status_id_str' => $in_reply_to['status_id_str'],
			'in_reply_to_user_id' => $in_reply_to['user_id'],
			'in_reply_to_user_id_str' => $in_reply_to['user_id_str'],
			'in_reply_to_screen_name' => $in_reply_to['screen_name'],
			'user' => $user_info,
			$geo => null,
			'coordinates' => "",
			'place' => "",
			'contributors' => "",
			'is_quote_status' => false,
			'retweet_count' => 0,
			'favorite_count' => 0,
			'favorited' => $lastwall['starred'] ? true : false,
			'retweeted' => false,
			'possibly_sensitive' => false,
			'lang' => "",
			'statusnet_html' => $converted["html"],
			'statusnet_conversation_id' => $lastwall['parent'],
			'external_url' => System::baseUrl() . "/display/" . $lastwall['guid'],
		);

		if (count($converted["attachments"]) > 0) {
			$status_info["attachments"] = $converted["attachments"];
		}

		if (count($converted["entities"]) > 0) {
			$status_info["entities"] = $converted["entities"];
		}

		if (($lastwall['item_network'] != "") && ($status["source"] == 'web')) {
			$status_info["source"] = ContactSelector::networkToName($lastwall['item_network'], $user_info['url']);
		} elseif (($lastwall['item_network'] != "") && (ContactSelector::networkToName($lastwall['item_network'], $user_info['url']) != $status_info["source"])) {
			$status_info["source"] = trim($status_info["source"].' ('.ContactSelector::networkToName($lastwall['item_network'], $user_info['url']).')');
		}

		// "uid" and "self" are only needed for some internal stuff, so remove it from here
		unset($status_info["user"]["uid"]);
		unset($status_info["user"]["self"]);
	}

	logger('status_info: '.print_r($status_info, true), LOGGER_DEBUG);

	if ($type == "raw") {
		return $status_info;
	}

	return api_format_data("statuses", $type, array('status' => $status_info));
}

/**
 * Returns extended information of a given user, specified by ID or screen name as per the required id parameter.
 * The author's most recent status will be returned inline.
 *
 * @param string $type Return type (atom, rss, xml, json)
 * @see https://developer.twitter.com/en/docs/accounts-and-users/follow-search-get-users/api-reference/get-users-show
 */
function api_users_show($type)
{
	$a = get_app();

	$user_info = api_get_user($a);
	$lastwall = q(
		"SELECT `item`.*
			FROM `item`
			INNER JOIN `contact` ON `contact`.`id`=`item`.`contact-id` AND `contact`.`uid` = `item`.`uid`
			WHERE `item`.`uid` = %d AND `verb` = '%s' AND `item`.`contact-id` = %d
				AND ((`item`.`author-link` IN ('%s', '%s')) OR (`item`.`owner-link` IN ('%s', '%s')))
				AND `type`!='activity'
				AND `item`.`allow_cid`='' AND `item`.`allow_gid`='' AND `item`.`deny_cid`='' AND `item`.`deny_gid`=''
			ORDER BY `id` DESC
			LIMIT 1",
		intval(api_user()),
		dbesc(ACTIVITY_POST),
		intval($user_info['cid']),
		dbesc($user_info['url']),
		dbesc(normalise_link($user_info['url'])),
		dbesc($user_info['url']),
		dbesc(normalise_link($user_info['url']))
	);

	if (DBM::is_result($lastwall)) {
		$lastwall = $lastwall[0];

		$in_reply_to = api_in_reply_to($lastwall);

		$converted = api_convert_item($lastwall);

		if ($type == "xml") {
			$geo = "georss:point";
		} else {
			$geo = "geo";
		}

		$user_info['status'] = array(
			'text' => $converted["text"],
			'truncated' => false,
			'created_at' => api_date($lastwall['created']),
			'in_reply_to_status_id' => $in_reply_to['status_id'],
			'in_reply_to_status_id_str' => $in_reply_to['status_id_str'],
			'source' => (($lastwall['app']) ? $lastwall['app'] : 'web'),
			'id' => intval($lastwall['contact-id']),
			'id_str' => (string) $lastwall['contact-id'],
			'in_reply_to_user_id' => $in_reply_to['user_id'],
			'in_reply_to_user_id_str' => $in_reply_to['user_id_str'],
			'in_reply_to_screen_name' => $in_reply_to['screen_name'],
			$geo => null,
			'favorited' => $lastwall['starred'] ? true : false,
			'statusnet_html' => $converted["html"],
			'statusnet_conversation_id' => $lastwall['parent'],
			'external_url' => System::baseUrl() . "/display/" . $lastwall['guid'],
		);

		if (count($converted["attachments"]) > 0) {
			$user_info["status"]["attachments"] = $converted["attachments"];
		}

		if (count($converted["entities"]) > 0) {
			$user_info["status"]["entities"] = $converted["entities"];
		}

		if (($lastwall['item_network'] != "") && ($user_info["status"]["source"] == 'web')) {
			$user_info["status"]["source"] = ContactSelector::networkToName($lastwall['item_network'], $user_info['url']);
		}

		if (($lastwall['item_network'] != "") && (ContactSelector::networkToName($lastwall['item_network'], $user_info['url']) != $user_info["status"]["source"])) {
			$user_info["status"]["source"] = trim($user_info["status"]["source"] . ' (' . ContactSelector::networkToName($lastwall['item_network'], $user_info['url']) . ')');
		}
	}

	// "uid" and "self" are only needed for some internal stuff, so remove it from here
	unset($user_info["uid"]);
	unset($user_info["self"]);

	return api_format_data("user", $type, array('user' => $user_info));
}

/// @TODO move to top of file or somewhere better
api_register_func('api/users/show', 'api_users_show');
api_register_func('api/externalprofile/show', 'api_users_show');

/**
 * Search a public user account.
 *
 * @param string $type Return type (atom, rss, xml, json)
 *
 * @return array|string
 * @see https://developer.twitter.com/en/docs/accounts-and-users/follow-search-get-users/api-reference/get-users-search
 */
function api_users_search($type)
{
	$a = get_app();

	$userlist = array();

	if (x($_GET, 'q')) {
		$r = q("SELECT id FROM `contact` WHERE `uid` = 0 AND `name` = '%s'", dbesc($_GET["q"]));

		if (!DBM::is_result($r)) {
			$r = q("SELECT `id` FROM `contact` WHERE `uid` = 0 AND `nick` = '%s'", dbesc($_GET["q"]));
		}

		if (DBM::is_result($r)) {
			$k = 0;
			foreach ($r as $user) {
				$user_info = api_get_user($a, $user["id"]);

				if ($type == "xml") {
					$userlist[$k++.":user"] = $user_info;
				} else {
					$userlist[] = $user_info;
				}
			}
			$userlist = array("users" => $userlist);
		} else {
			throw new BadRequestException("User not found.");
		}
	} else {
		throw new BadRequestException("User not found.");
	}

	return api_format_data("users", $type, $userlist);
}

/// @TODO move to top of file or somewhere better
api_register_func('api/users/search', 'api_users_search');

/**