friendica_2021-01/mod/salmon.php
Roland Häder 61693419e8 Cleanups: isResult() more used, readability improved (#5608)
* [diaspora]: Maybe SimpleXMLElement is the right type-hint?

* Changes proposed + pre-renaming:
- pre-renamed $db -> $connection
- added TODOs for not allowing bad method invocations (there is a
  BadMethodCallException in SPL)

* If no record is found, below $r[0] will fail with a E_NOTICE and the code
doesn't behave as expected.

* Ops, one more left ...

* Continued:
- added documentation for Contact::updateSslPolicy() method
- added type-hint for $contact of same method
- empty lines added + TODO where the bug origins that $item has no element 'body'

* Added empty lines for better readability

* Cleaned up:
- no more x() (deprecated) usage but empty() instead
- fixed mixing of space/tab indending
- merged else/if block goether in elseif() (lesser nested code blocks)

* Re-fixed DBM -> DBA switch

* Fixes/rewrites:
- use empty()/isset() instead of deprecated x()
- merged 2 nested if() blocks into one
- avoided nested if() block inside else block by rewriting it to elseif()
- $contact_id is an integer, let's test on > 0 here
- added a lot spaces and some empty lines for better readability

* Rewrite:
- moved all CONTACT_* constants from boot.php to Contact class

* CR request:
- renamed Contact::CONTACT_IS_* -> Contact::* ;-)

* Rewrites:
- moved PAGE_* to Friendica\Model\Profile class
- fixed mixure with "Contact::* rewrite"

* Ops, one still there (return is no function)

* Rewrite to Proxy class:
- introduced new Friendica\Network\Proxy class for in exchange of proxy_*()
  functions
- moved also all PROXY_* constants there as Proxy::*
- removed now no longer needed mod/proxy.php loading as composer's auto-load
  will do this for us
- renamed those proxy_*() functions to better names:
  + proxy_init()           -> Proxy::init()         (public)
  + proxy_url()            -> Proxy::proxifyUrl()   (public)
  + proxy_parse_html()     -> Proxy::proxifyHtml()  (public)
  + proxy_is_local_image() -> Proxy::isLocalImage() (private)
  + proxy_parse_query()    -> Proxy::parseQuery()   (private)
  + proxy_img_cb()         -> Proxy::replaceUrl()   (private)

* CR request:
- moved all PAGE_* constants to Friendica\Model\Contact class
- fixed all references of both classes

* Ops, need to set $a here ...

* CR request:
- moved Proxy class to Friendica\Module
- extended BaseModule

* Ops, no need for own instance of $a when self::getApp() is around.

* Proxy-rewrite:
- proxy_url() and proxy_parse_html() are both non-module functions (now
  methods)
- so they must be splitted into a seperate class
- also the SIZE_* and DEFAULT_TIME constants are both not relevant to module

* No instances from utility classes

* Fixed error:
- proxify*() is now located in `Friendica\Util\ProxyUtils`

* Moved back to original place, ops? How did they move here? Well, it was not
intended by me.

* Removed duplicate (left-over from split) constants and static array. Thank to
MrPetovan finding it.

* Renamed ProxyUtils -> Proxy and aliased it back to ProxyUtils.

* Rewrite:
- stopped using deprecated NETWORK_* constants, now Protocol::* should be used
- still left them intact for slow/lazy developers ...

* Ops, was added accidentally ...

* Ops, why these wrong moves?

* Ops, one to much (thanks to MrPetovan)

* Ops, wrong moving ...

* moved back to original place ...

* spaces added

* empty lines add for better readability.

* convertered spaces -> tab for code indenting.

* CR request: Add space between if and brace.

* CR requests fixed + move reverted
- ops, src/Module/*.php has been moved to src/Network/ accidentally
- reverted some parts in src/Database/DBA.php as pointed out by Annando
- removed internal TODO items
- added some spaces for better readability
2018-08-24 01:05:49 -04:00

194 lines
5 KiB
PHP

<?php
/**
* @file mod/salmon.php
*/
use Friendica\App;
use Friendica\Core\PConfig;
use Friendica\Core\Protocol;
use Friendica\Core\System;
use Friendica\Database\DBA;
use Friendica\Model\Contact;
use Friendica\Protocol\OStatus;
use Friendica\Protocol\Salmon;
use Friendica\Util\Crypto;
require_once 'include/items.php';
function salmon_post(App $a, $xml = '') {
if (empty($xml)) {
$xml = file_get_contents('php://input');
}
logger('new salmon ' . $xml, LOGGER_DATA);
$nick = (($a->argc > 1) ? notags(trim($a->argv[1])) : '');
$mentions = (($a->argc > 2 && $a->argv[2] === 'mention') ? true : false);
$r = q("SELECT * FROM `user` WHERE `nickname` = '%s' AND `account_expired` = 0 AND `account_removed` = 0 LIMIT 1",
DBA::escape($nick)
);
if (! DBA::isResult($r)) {
System::httpExit(500);
}
$importer = $r[0];
// parse the xml
$dom = simplexml_load_string($xml,'SimpleXMLElement',0,NAMESPACE_SALMON_ME);
$base = null;
// figure out where in the DOM tree our data is hiding
if($dom->provenance->data)
$base = $dom->provenance;
elseif($dom->env->data)
$base = $dom->env;
elseif($dom->data)
$base = $dom;
if(! $base) {
logger('unable to locate salmon data in xml ');
System::httpExit(400);
}
// Stash the signature away for now. We have to find their key or it won't be good for anything.
$signature = base64url_decode($base->sig);
// unpack the data
// strip whitespace so our data element will return to one big base64 blob
$data = str_replace([" ","\t","\r","\n"],["","","",""],$base->data);
// stash away some other stuff for later
$type = $base->data[0]->attributes()->type[0];
$keyhash = $base->sig[0]->attributes()->keyhash[0];
$encoding = $base->encoding;
$alg = $base->alg;
// Salmon magic signatures have evolved and there is no way of knowing ahead of time which
// flavour we have. We'll try and verify it regardless.
$stnet_signed_data = $data;
$signed_data = $data . '.' . base64url_encode($type) . '.' . base64url_encode($encoding) . '.' . base64url_encode($alg);
$compliant_format = str_replace('=', '', $signed_data);
// decode the data
$data = base64url_decode($data);
$author = OStatus::salmonAuthor($data, $importer);
$author_link = $author["author-link"];
if(! $author_link) {
logger('Could not retrieve author URI.');
System::httpExit(400);
}
// Once we have the author URI, go to the web and try to find their public key
logger('Fetching key for ' . $author_link);
$key = Salmon::getKey($author_link, $keyhash);
if(! $key) {
logger('Could not retrieve author key.');
System::httpExit(400);
}
$key_info = explode('.',$key);
$m = base64url_decode($key_info[1]);
$e = base64url_decode($key_info[2]);
logger('key details: ' . print_r($key_info,true), LOGGER_DEBUG);
$pubkey = Crypto::meToPem($m, $e);
// We should have everything we need now. Let's see if it verifies.
// Try GNU Social format
$verify = Crypto::rsaVerify($signed_data, $signature, $pubkey);
$mode = 1;
if (! $verify) {
logger('message did not verify using protocol. Trying compliant format.');
$verify = Crypto::rsaVerify($compliant_format, $signature, $pubkey);
$mode = 2;
}
if (! $verify) {
logger('message did not verify using padding. Trying old statusnet format.');
$verify = Crypto::rsaVerify($stnet_signed_data, $signature, $pubkey);
$mode = 3;
}
if (! $verify) {
logger('Message did not verify. Discarding.');
System::httpExit(400);
}
logger('Message verified with mode '.$mode);
/*
*
* If we reached this point, the message is good. Now let's figure out if the author is allowed to send us stuff.
*
*/
$r = q("SELECT * FROM `contact` WHERE `network` IN ('%s', '%s')
AND (`nurl` = '%s' OR `alias` = '%s' OR `alias` = '%s')
AND `uid` = %d LIMIT 1",
DBA::escape(Protocol::OSTATUS),
DBA::escape(Protocol::DFRN),
DBA::escape(normalise_link($author_link)),
DBA::escape($author_link),
DBA::escape(normalise_link($author_link)),
intval($importer['uid'])
);
if (!DBA::isResult($r)) {
logger('Author ' . $author_link . ' unknown to user ' . $importer['uid'] . '.');
if (PConfig::get($importer['uid'], 'system', 'ostatus_autofriend')) {
$result = Contact::createFromProbe($importer['uid'], $author_link);
if ($result['success']) {
$r = q("SELECT * FROM `contact` WHERE `network` = '%s' AND ( `url` = '%s' OR `alias` = '%s')
AND `uid` = %d LIMIT 1",
DBA::escape(Protocol::OSTATUS),
DBA::escape($author_link),
DBA::escape($author_link),
intval($importer['uid'])
);
}
}
}
// Have we ignored the person?
// If so we can not accept this post.
//if((DBA::isResult($r)) && (($r[0]['readonly']) || ($r[0]['rel'] == Contact::FOLLOWER) || ($r[0]['blocked']))) {
if (DBA::isResult($r) && $r[0]['blocked']) {
logger('Ignoring this author.');
System::httpExit(202);
// NOTREACHED
}
// Placeholder for hub discovery.
$hub = '';
$contact_rec = ((DBA::isResult($r)) ? $r[0] : null);
OStatus::import($data, $importer, $contact_rec, $hub);
System::httpExit(200);
}