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Merge pull request #6071 from annando/ap-fetch-signed

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Support for fetching non-public content / preparations for forum posts
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Hypolite Petovan 2018-11-04 01:56:09 -05:00 committed by GitHub
commit 62761e1099
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GPG key ID: 4AEE18F83AFDEB23
5 changed files with 188 additions and 30 deletions
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10
src/Protocol/ActivityPub.php
View file

@ -7,6 +7,7 @@ namespace Friendica\Protocol;
use Friendica\Util\Network;
use Friendica\Core\Protocol;
use Friendica\Model\APContact;
use Friendica\Util\HTTPSignature;
/**
* @brief ActivityPub Protocol class
@ -59,11 +60,16 @@ class ActivityPub
/**
* Fetches ActivityPub content from the given url
*
* @param string $url content url
* @param string $url content url
* @param integer $uid User ID for the signature
* @return array
*/
public static function fetchContent($url)
public static function fetchContent($url, $uid = 0)
{
if (!empty($uid)) {
return HTTPSignature::fetch($url, 1);
}
$curlResult = Network::curl($url, false, $redirects, ['accept_content' => 'application/activity+json, application/ld+json']);
if (!$curlResult->isSuccess() || empty($curlResult->getBody())) {
return false;

4
src/Protocol/ActivityPub/Processor.php
View file

@ -301,7 +301,9 @@ class Processor
return;
}
$object = ActivityPub::fetchContent($url);
$uid = ActivityPub\Receiver::getFirstUserFromReceivers($child['receiver']);
$object = ActivityPub::fetchContent($url, $uid);
if (empty($object)) {
Logger::log('Activity ' . $url . ' was not fetchable, aborting.');
return;

147
src/Protocol/ActivityPub/Receiver.php
View file

@ -111,12 +111,13 @@ class Receiver
/**
* Fetches the object type for a given object id
*
* @param array $activity
* @param string $object_id Object ID of the the provided object
* @param array $activity
* @param string $object_id Object ID of the the provided object
* @param integer $uid User ID
*
* @return string with object type
*/
private static function fetchObjectType($activity, $object_id)
private static function fetchObjectType($activity, $object_id, $uid = 0)
{
if (!empty($activity['as:object'])) {
$object_type = JsonLD::fetchElement($activity['as:object'], '@type');
@ -135,7 +136,7 @@ class Receiver
return 'as:' . $profile['type'];
}
$data = ActivityPub::fetchContent($object_id);
$data = ActivityPub::fetchContent($object_id, $uid);
if (!empty($data)) {
$object = JsonLD::compact($data);
$type = JsonLD::fetchElement($object, '@type');
@ -171,12 +172,15 @@ class Receiver
// When it is a delivery to a personal inbox we add that user to the receivers
if (!empty($uid)) {
$owner = User::getOwnerDataById($uid);
$additional = ['uid:' . $uid => $uid];
$receivers = array_merge($receivers, $additional);
} else {
// We possibly need some user to fetch private content,
// so we fetch the first out ot the list.
$uid = self::getFirstUserFromReceivers($receivers);
}
Logger::log('Receivers: ' . json_encode($receivers), Logger::DEBUG);
Logger::log('Receivers: ' . $uid . ' - ' . json_encode($receivers), Logger::DEBUG);
$object_id = JsonLD::fetchElement($activity, 'as:object');
if (empty($object_id)) {
@ -184,14 +188,14 @@ class Receiver
return [];
}
$object_type = self::fetchObjectType($activity, $object_id);
$object_type = self::fetchObjectType($activity, $object_id, $uid);
// Fetch the content only on activities where this matters
if (in_array($type, ['as:Create', 'as:Update', 'as:Announce'])) {
if ($type == 'as:Announce') {
$trust_source = false;
}
$object_data = self::fetchObject($object_id, $activity['as:object'], $trust_source);
$object_data = self::fetchObject($object_id, $activity['as:object'], $trust_source, $uid);
if (empty($object_data)) {
Logger::log("Object data couldn't be processed", Logger::DEBUG);
return [];
@ -216,7 +220,7 @@ class Receiver
// An Undo is done on the object of an object, so we need that type as well
if ($type == 'as:Undo') {
$object_data['object_object_type'] = self::fetchObjectType([], $object_data['object_object']);
$object_data['object_object_type'] = self::fetchObjectType([], $object_data['object_object'], $uid);
}
}
@ -235,6 +239,22 @@ class Receiver
return $object_data;
}
/**
* Fetches the first uider id from the receiver array
*
* @param array $receivers Array with receivers
* @return integer user id;
*/
public static function getFirstUserFromReceivers($receivers)
{
foreach ($receivers as $receiver) {
if (!empty($receiver)) {
return $receiver;
}
}
return 0;
}
/**
* Store the unprocessed data into the conversation table
* This has to be done outside the regular function,
@ -395,10 +415,11 @@ class Receiver
*
* @param array $activity
* @param string $actor
* @param array $tags
*
* @return array with receivers (user id)
*/
private static function getReceivers($activity, $actor)
private static function getReceivers($activity, $actor, $tags = [])
{
$receivers = [];
@ -446,24 +467,34 @@ class Receiver
}
if (in_array($receiver, [$followers, self::PUBLIC_COLLECTION]) && !empty($actor)) {
$networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
$condition = ['nurl' => normalise_link($actor), 'rel' => [Contact::SHARING, Contact::FRIEND],
'network' => $networks, 'archive' => false, 'pending' => false];
$contacts = DBA::select('contact', ['uid'], $condition);
while ($contact = DBA::fetch($contacts)) {
if ($contact['uid'] != 0) {
$receivers['uid:' . $contact['uid']] = $contact['uid'];
}
}
DBA::close($contacts);
$receivers = array_merge($receivers, self::getReceiverForActor($actor, $tags));
continue;
}
// Fetching all directly addressed receivers
$condition = ['self' => true, 'nurl' => normalise_link($receiver)];
$contact = DBA::selectFirst('contact', ['uid'], $condition);
$contact = DBA::selectFirst('contact', ['uid', 'contact-type'], $condition);
if (!DBA::isResult($contact)) {
continue;
}
// Check if the potential receiver is following the actor
// Exception: The receiver is targetted via "to" or this is a comment
if ((($element != 'as:to') && empty($replyto)) || ($contact['contact-type'] == Contact::ACCOUNT_TYPE_COMMUNITY)) {
$networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
$condition = ['nurl' => normalise_link($actor), 'rel' => [Contact::SHARING, Contact::FRIEND],
'network' => $networks, 'archive' => false, 'pending' => false, 'uid' => $contact['uid']];
// Forum posts are only accepted from forum contacts
if ($contact['contact-type'] == Contact::ACCOUNT_TYPE_COMMUNITY) {
$condition['rel'] = [Contact::SHARING, Contact::FRIEND, Contact::FOLLOWER];
}
if (!DBA::exists('contact', $condition)) {
continue;
}
}
$receivers['uid:' . $contact['uid']] = $contact['uid'];
}
}
@ -473,6 +504,71 @@ class Receiver
return $receivers;
}
/**
* Fetch the receiver list of a given actor
*
* @param string $actor
* @param array $tags
*
* @return array with receivers (user id)
*/
public static function getReceiverForActor($actor, $tags)
{
$receivers = [];
$networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
$condition = ['nurl' => normalise_link($actor), 'rel' => [Contact::SHARING, Contact::FRIEND, Contact::FOLLOWER],
'network' => $networks, 'archive' => false, 'pending' => false];
$contacts = DBA::select('contact', ['uid', 'rel'], $condition);
while ($contact = DBA::fetch($contacts)) {
if (self::isValidReceiverForActor($contact, $actor, $tags)) {
$receivers['uid:' . $contact['uid']] = $contact['uid'];
}
}
DBA::close($contacts);
return $receivers;
}
/**
* Tests if the contact is a valid receiver for this actor
*
* @param array $contact
* @param string $actor
* @param array $tags
*
* @return array with receivers (user id)
*/
private static function isValidReceiverForActor($contact, $actor, $tags)
{
// Public contacts are no valid receiver
if ($contact['uid'] == 0) {
return false;
}
// Are we following the contact? Then this is a valid receiver
if (in_array($contact['rel'], [Contact::SHARING, Contact::FRIEND])) {
return true;
}
// When the possible receiver isn't a community, then it is no valid receiver
$owner = User::getOwnerDataById($contact['uid']);
if (empty($owner) || ($owner['contact-type'] != Contact::ACCOUNT_TYPE_COMMUNITY)) {
return false;
}
// Is the community account tagged?
foreach ($tags as $tag) {
if ($tag['type'] != 'Mention') {
continue;
}
if ($tag['href'] == $owner['url']) {
return true;
}
}
return false;
}
/**
* Switches existing contacts to ActivityPub
*
@ -559,16 +655,17 @@ class Receiver
* @param string $object_id Object ID of the the provided object
* @param array $object The provided object array
* @param boolean $trust_source Do we trust the provided object?
* @param integer $uid User ID for the signature that we use to fetch data
*
* @return array with trusted and valid object data
*/
private static function fetchObject($object_id, $object = [], $trust_source = false)
private static function fetchObject($object_id, $object = [], $trust_source = false, $uid = 0)
{
// By fetching the type we check if the object is complete.
$type = JsonLD::fetchElement($object, '@type');
if (!$trust_source || empty($type)) {
$data = ActivityPub::fetchContent($object_id);
$data = ActivityPub::fetchContent($object_id, $uid);
if (!empty($data)) {
$object = JsonLD::compact($data);
Logger::log('Fetched content for ' . $object_id, Logger::DEBUG);
@ -604,7 +701,7 @@ class Receiver
if (empty($object_id)) {
return false;
}
return self::fetchObject($object_id);
return self::fetchObject($object_id, [], false, $uid);
}
Logger::log('Unhandled object type: ' . $type, Logger::DEBUG);
@ -736,7 +833,7 @@ class Receiver
}
}
$object_data['receiver'] = self::getReceivers($object, $object_data['actor']);
$object_data['receiver'] = self::getReceivers($object, $object_data['actor'], $object_data['tags']);
// Common object data:

52
src/Util/HTTPSignature.php
View file

@ -90,7 +90,7 @@ class HTTPSignature
$key = $key($sig_block['keyId']);
}
Logger::log('Got keyID ' . $sig_block['keyId']);
Logger::log('Got keyID ' . $sig_block['keyId'], Logger::DEBUG);
if (!$key) {
return $result;
@ -308,11 +308,59 @@ class HTTPSignature
$postResult = Network::post($target, $content, $headers);
$return_code = $postResult->getReturnCode();
Logger::log('Transmit to ' . $target . ' returned ' . $return_code);
Logger::log('Transmit to ' . $target . ' returned ' . $return_code, Logger::DEBUG);
return ($return_code >= 200) && ($return_code <= 299);
}
/**
* @brief Fetches JSON data for a user
*
* @param string $request request url
* @param integer $uid User id of the requester
*
* @return array JSON array
*/
public static function fetch($request, $uid)
{
$owner = User::getOwnerDataById($uid);
if (!$owner) {
return;
}
// Header data that is about to be signed.
$host = parse_url($request, PHP_URL_HOST);
$path = parse_url($request, PHP_URL_PATH);
$headers = ['Host: ' . $host];
$signed_data = "(request-target): get " . $path . "\nhost: " . $host;
$signature = base64_encode(Crypto::rsaSign($signed_data, $owner['uprvkey'], 'sha256'));
$headers[] = 'Signature: keyId="' . $owner['url'] . '#main-key' . '",algorithm="rsa-sha256",headers="(request-target) host",signature="' . $signature . '"';
$headers[] = 'Accept: application/activity+json, application/ld+json';
$curlResult = Network::curl($request, false, $redirects, ['header' => $headers]);
$return_code = $curlResult->getReturnCode();
Logger::log('Fetched for user ' . $uid . ' from ' . $request . ' returned ' . $return_code, Logger::DEBUG);
if (!$curlResult->isSuccess() || empty($curlResult->getBody())) {
return false;
}
$content = json_decode($curlResult->getBody(), true);
if (empty($content) || !is_array($content)) {
return false;
}
return $content;
}
/**
* @brief Gets a signer from a given HTTP request
*

5
src/Util/Network.php
View file

@ -83,6 +83,7 @@ class Network
* 'novalidate' => do not validate SSL certs, default is to validate using our CA list
* 'nobody' => only return the header
* 'cookiejar' => path to cookie jar file
* 'header' => header array
*
* @return CurlResult
*/
@ -136,6 +137,10 @@ class Network
);
}
if (!empty($opts['header'])) {
curl_setopt($ch, CURLOPT_HTTPHEADER, $opts['header']);
}
@curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
@curl_setopt($ch, CURLOPT_USERAGENT, $a->getUserAgent());