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authorKlaus Weidenbach <Klaus.Weidenbach@gmx.net>2019-01-18 22:17:10 +0100
committerKlaus Weidenbach <Klaus.Weidenbach@gmx.net>2019-01-23 22:25:47 +0100
commit13e0151cd2569832588cc9a973bcf40d850edd53 (patch)
tree1d2054ca8b9edd9435d1ffa4c2584afea9121102 /Zotlabs/Lib/Libzot.php
parent51a7be29f50c4c62a2afb0ed155df43af9351fad (diff)
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Correct and extend Doxygen comments.
Correct some documentation errors for Doxygen and add more comments. Document some undefined variables with @FIXME.
Diffstat (limited to 'Zotlabs/Lib/Libzot.php')
-rw-r--r--Zotlabs/Lib/Libzot.php228
1 files changed, 115 insertions, 113 deletions
diff --git a/Zotlabs/Lib/Libzot.php b/Zotlabs/Lib/Libzot.php
index a0f6e077a..167e2d67d 100644
--- a/Zotlabs/Lib/Libzot.php
+++ b/Zotlabs/Lib/Libzot.php
@@ -2,11 +2,6 @@
namespace Zotlabs\Lib;
-/**
- * @brief lowlevel implementation of Zot6 protocol.
- *
- */
-
use Zotlabs\Zot6\HTTPSig;
use Zotlabs\Access\Permissions;
use Zotlabs\Access\PermissionLimits;
@@ -14,14 +9,17 @@ use Zotlabs\Daemon\Master;
require_once('include/crypto.php');
-
+/**
+ * @brief Lowlevel implementation of Zot6 protocol.
+ *
+ */
class Libzot {
/**
* @brief Generates a unique string for use as a zot guid.
*
- * Generates a unique string for use as a zot guid using our DNS-based url, the
- * channel nickname and some entropy.
+ * Generates a unique string for use as a zot guid using our DNS-based url,
+ * the channel nickname and some entropy.
* The entropy ensures uniqueness against re-installs where the same URL and
* nickname are chosen.
*
@@ -32,9 +30,8 @@ class Libzot {
* immediate universe.
*
* @param string $channel_nick a unique nickname of controlling entity
- * @returns string
+ * @return string
*/
-
static function new_uid($channel_nick) {
$rawstr = z_root() . '/' . $channel_nick . '.' . mt_rand();
return(base64url_encode(hash('whirlpool', $rawstr, true), true));
@@ -52,8 +49,8 @@ class Libzot {
*
* @param string $guid
* @param string $pubkey
+ * @return string
*/
-
static function make_xchan_hash($guid, $pubkey) {
return base64url_encode(hash('whirlpool', $guid . $pubkey, true));
}
@@ -65,10 +62,8 @@ class Libzot {
* should only be used by channels which are defined on this hub.
*
* @param string $hash - xchan_hash
- * @returns array of hubloc (hub location structures)
- *
+ * @return array of hubloc (hub location structures)
*/
-
static function get_hublocs($hash) {
/* Only search for active hublocs - e.g. those that haven't been marked deleted */
@@ -92,16 +87,17 @@ class Libzot {
* packet type: one of 'ping', 'pickup', 'purge', 'refresh', 'keychange', 'force_refresh', 'notify', 'auth_check'
* @param array $recipients
* envelope recipients, array of portable_id's; empty for public posts
- * @param string msg
+ * @param string $msg
* optional message
+ * @param string $encoding
+ * optional encoding, default 'activitystreams'
* @param string $remote_key
* optional public site key of target hub used to encrypt entire packet
* NOTE: remote_key and encrypted packets are required for 'auth_check' packets, optional for all others
* @param string $methods
- * optional comma separated list of encryption methods @ref self::best_algorithm()
+ * optional comma separated list of encryption methods @ref best_algorithm()
* @returns string json encoded zot packet
*/
-
static function build_packet($channel, $type = 'activity', $recipients = null, $msg = '', $encoding = 'activitystreams', $remote_key = null, $methods = '') {
$sig_method = get_config('system','signature_algorithm','sha256');
@@ -146,11 +142,10 @@ class Libzot {
* @brief Choose best encryption function from those available on both sites.
*
* @param string $methods
- * comma separated list of encryption methods
+ * Comma separated list of encryption methods
* @return string first match from our site method preferences crypto_methods() array
- * of a method which is common to both sites; or 'aes256cbc' if no matches are found.
+ * of a method which is common to both sites; or 'aes256cbc' if no matches are found.
*/
-
static function best_algorithm($methods) {
$x = [
@@ -164,7 +159,6 @@ class Libzot {
* * \e string \b methods - comma separated list of encryption methods
* * \e string \b result - the algorithm to return
*/
-
call_hooks('zot_best_algorithm', $x);
if($x['result'])
@@ -190,7 +184,7 @@ class Libzot {
/**
- * @brief send a zot message
+ * @brief Send a zot message.
*
* @see z_post_url()
*
@@ -200,18 +194,17 @@ class Libzot {
* @param array $crypto (required if encrypted httpsig, requires hubloc_sitekey and site_crypto elements)
* @return array see z_post_url() for returned data format
*/
-
static function zot($url, $data, $channel = null,$crypto = null) {
if($channel) {
- $headers = [
- 'X-Zot-Token' => random_string(),
- 'Digest' => HTTPSig::generate_digest_header($data),
+ $headers = [
+ 'X-Zot-Token' => random_string(),
+ 'Digest' => HTTPSig::generate_digest_header($data),
'Content-type' => 'application/x-zot+json',
'(request-target)' => 'post ' . get_request_string($url)
];
- $h = HTTPSig::create_sig($headers,$channel['channel_prvkey'],channel_url($channel),false,'sha512',
+ $h = HTTPSig::create_sig($headers,$channel['channel_prvkey'],channel_url($channel),false,'sha512',
(($crypto) ? [ 'key' => $crypto['hubloc_sitekey'], 'algorithm' => self::best_algorithm($crypto['site_crypto']) ] : false));
}
else {
@@ -227,7 +220,6 @@ class Libzot {
/**
* @brief Refreshes after permission changed or friending, etc.
*
- *
* refresh is typically invoked when somebody has changed permissions of a channel and they are notified
* to fetch new permissions via a finger/discovery operation. This may result in a new connection
* (abook entry) being added to a local channel and it may result in auto-permissions being granted.
@@ -251,7 +243,6 @@ class Libzot {
* * \b true if successful
* * otherwise \b false
*/
-
static function refresh($them, $channel = null, $force = false) {
logger('them: ' . print_r($them,true), LOGGER_DATA, LOG_DEBUG);
@@ -265,7 +256,7 @@ class Libzot {
}
else {
$r = null;
-
+
// if they re-installed the server we could end up with the wrong record - pointing to the old install.
// We'll order by reverse id to try and pick off the newest one first and hopefully end up with the
// correct hubloc. If this doesn't work we may have to re-write this section to try them all.
@@ -317,6 +308,7 @@ class Libzot {
if(! $hsig_valid) {
logger('http signature not valid: ' . print_r($hsig,true));
+ /// @FIXME $result is undefined
return $result;
}
@@ -416,7 +408,7 @@ class Libzot {
if($y) {
logger("New introduction received for {$channel['channel_name']}");
$new_perms = get_all_perms($channel['channel_id'],$x['hash'],false);
-
+
// Send a clone sync packet and a permissions update if permissions have changed
$new_connection = q("select * from abook left join xchan on abook_xchan = xchan_hash where abook_xchan = '%s' and abook_channel = %d and abook_self = 0 order by abook_created desc limit 1",
@@ -524,10 +516,14 @@ class Libzot {
return false;
}
-
-
-
- static function valid_hub($sender,$site_id) {
+ /**
+ * @brief
+ *
+ * @param string $sender
+ * @param string $site_id
+ * @return null|array
+ */
+ static function valid_hub($sender, $site_id) {
$r = q("select hubloc.*, site.site_crypto from hubloc left join site on hubloc_url = site_url where hubloc_hash = '%s' and hubloc_site_id = '%s' limit 1",
dbesc($sender),
@@ -548,7 +544,6 @@ class Libzot {
}
return $r[0];
-
}
/**
@@ -559,21 +554,14 @@ class Libzot {
* origination address. This will fetch the discovery packet of the sender,
* which contains the public key we need to verify our guid and url signatures.
*
- * @param array $arr an associative array which must contain:
- * * \e string \b guid => guid of conversant
- * * \e string \b guid_sig => guid signed with conversant's private key
- * * \e string \b url => URL of the origination hub of this communication
- * * \e string \b url_sig => URL signed with conversant's private key
+ * @param string $id
*
* @return array An associative array with
- * * \b success boolean true or false
- * * \b message (optional) error string only if success is false
+ * * \e boolean \b success
+ * * \e string \b message (optional, unused) error string only if success is false
*/
-
static function register_hub($id) {
- $id_hash = false;
- $valid = false;
$hsig_valid = false;
$result = [ 'success' => false ];
@@ -807,7 +795,7 @@ class Libzot {
// If setting for the default profile, unset the profile photo flag from any other photos I own
if($is_default_profile) {
- q("UPDATE photo SET photo_usage = %d WHERE photo_usage = %d AND resource_id != '%s' AND aid = %d AND uid = %d",
+ q("UPDATE photo SET photo_usage = %d WHERE photo_usage = %d AND resource_id != '%s' AND aid = %d AND uid = %d",
intval(PHOTO_NORMAL),
intval(PHOTO_PROFILE),
dbesc($hash),
@@ -954,8 +942,8 @@ class Libzot {
* @param string $hub - url of site we just contacted
* @param array $arr - output of z_post_url()
* @param array $outq - The queue structure attached to this request
+ * @return void
*/
-
static function process_response($hub, $arr, $outq) {
logger('remote: ' . print_r($arr,true),LOGGER_DATA);
@@ -986,7 +974,7 @@ class Libzot {
if(! $x['success']) {
// handle remote validation issues
-
+
$b = q("update dreport set dreport_result = '%s', dreport_time = '%s' where dreport_queue = '%s'",
dbesc(($x['message']) ? $x['message'] : 'unknown delivery error'),
dbesc(datetime_convert()),
@@ -994,7 +982,7 @@ class Libzot {
);
}
- if(is_array($x) && array_key_exists('delivery_report',$x) && is_array($x['delivery_report'])) {
+ if(is_array($x) && array_key_exists('delivery_report',$x) && is_array($x['delivery_report'])) {
foreach($x['delivery_report'] as $xx) {
call_hooks('dreport_process',$xx);
@@ -1083,11 +1071,6 @@ class Libzot {
*
* @param array $arr
* 'pickup' structure returned from remote site
- * @param string $sender_url
- * the url specified by the sender in the initial communication.
- * We will verify the sender and url in each returned message structure and
- * also verify that all the messages returned match the site url that we are
- * currently processing.
*
* @returns array
* Suitable for logging remotely, enumerating the processing results of each message/recipient combination
@@ -1095,7 +1078,6 @@ class Libzot {
* * [1] => \e string $delivery_status
* * [2] => \e string $address
*/
-
static function import($arr) {
$env = $arr;
@@ -1117,7 +1099,7 @@ class Libzot {
$has_data = array_key_exists('data',$env) && $env['data'];
$data = (($has_data) ? $env['data'] : false);
- $AS = null;
+ $AS = null;
if($env['encoding'] === 'activitystreams') {
@@ -1175,7 +1157,6 @@ class Libzot {
$deliveries = self::public_recips($env,$AS);
-
}
$deliveries = array_unique($deliveries);
@@ -1196,7 +1177,7 @@ class Libzot {
$r = q("select hubloc_hash from hubloc where hubloc_id_url = '%s' and hubloc_network = 'zot6' limit 1",
dbesc($AS->actor['id'])
- );
+ );
if($r) {
$arr['author_xchan'] = $r[0]['hubloc_hash'];
@@ -1205,20 +1186,20 @@ class Libzot {
$s = q("select hubloc_hash from hubloc where hubloc_id_url = '%s' and hubloc_network = 'zot6' limit 1",
dbesc($env['sender'])
- );
+ );
// in individual delivery, change owner if needed
if($s) {
$arr['owner_xchan'] = $s[0]['hubloc_hash'];
}
else {
- $arr['owner_xchan'] = $env['sender'];
+ $arr['owner_xchan'] = $env['sender'];
}
if($private) {
$arr['item_private'] = true;
}
- // @fixme - spoofable
+ /// @FIXME - spoofable
if($AS->data['hubloc']) {
$arr['item_verified'] = true;
}
@@ -1247,12 +1228,19 @@ class Libzot {
}
if ($result) {
$return = array_merge($return, $result);
- }
+ }
return $return;
}
- static function is_top_level($env,$act) {
+ /**
+ * @brief
+ *
+ * @param array $env
+ * @param object $act
+ * @return boolean
+ */
+ static function is_top_level($env, $act) {
if($env['encoding'] === 'zot' && array_key_exists('flags',$env) && in_array('thread_parent', $env['flags'])) {
return true;
}
@@ -1295,9 +1283,9 @@ class Libzot {
* Some of these will be rejected, but this gives us a place to start.
*
* @param array $msg
- * @return NULL|array
+ * @param object $act
+ * @return array
*/
-
static function public_recips($msg, $act) {
require_once('include/channel.php');
@@ -1442,7 +1430,7 @@ class Libzot {
* will normally arrive first via sync delivery, but this isn't guaranteed.
* There's a chance the current delivery could take place before the cloned copy arrives
* hence the item could have the wrong ACL and *could* be used in subsequent deliveries or
- * access checks.
+ * access checks.
*/
if($sender === $channel['channel_portable_id'] && $arr['author_xchan'] === $channel['channel_portable_id'] && $arr['mid'] === $arr['parent_mid']) {
@@ -1504,7 +1492,7 @@ class Libzot {
$allowed = true;
$friendofriend = true;
}
-
+
if (! $allowed) {
logger("permission denied for delivery to channel {$channel['channel_id']} {$channel['channel_address']}");
$DR->update('permission denied');
@@ -1524,7 +1512,7 @@ class Libzot {
// this is so that permissions mismatches between senders apply to the entire conversation
// As a side effect we will also do a preliminary check that we have the top-level-post, otherwise
// processing it is pointless.
-
+
$r = q("select route, id, owner_xchan, item_private from item where mid = '%s' and uid = %d limit 1",
dbesc($arr['parent_mid']),
intval($channel['channel_id'])
@@ -1553,14 +1541,14 @@ class Libzot {
}
continue;
}
-
+
if($relay || $friendofriend || (intval($r[0]['item_private']) === 0 && intval($arr['item_private']) === 0)) {
// reset the route in case it travelled a great distance upstream
// use our parent's route so when we go back downstream we'll match
// with whatever route our parent has.
// Also friend-of-friend conversations may have been imported without a route,
// but we are now getting comments via listener delivery
- // and if there is no privacy on this or the parent, we don't care about the route,
+ // and if there is no privacy on this or the parent, we don't care about the route,
// so just set the owner and route accordingly.
$arr['route'] = $r[0]['route'];
$arr['owner_xchan'] = $r[0]['owner_xchan'];
@@ -1614,13 +1602,13 @@ class Libzot {
// remove_community_tag is a no-op if this isn't a community tag activity
self::remove_community_tag($sender,$arr,$channel['channel_id']);
-
+
// set these just in case we need to store a fresh copy of the deleted post.
// This could happen if the delete got here before the original post did.
$arr['aid'] = $channel['channel_account_id'];
$arr['uid'] = $channel['channel_id'];
-
+
$item_id = self::delete_imported_item($sender,$arr,$channel['channel_id'],$relay);
$DR->update(($item_id) ? 'deleted' : 'delete_failed');
$result[] = $DR->get();
@@ -1716,7 +1704,7 @@ class Libzot {
* * \e array \b item
* * \e array \b sender
* * \e array \b channel
- */
+ */
call_hooks('activity_received', $parr);
// don't add a source route if it's a relay or later recipients will get a route mismatch
if(! $relay)
@@ -1783,7 +1771,7 @@ class Libzot {
$r = q("select hubloc_hash from hubloc where hubloc_id_url = '%s' and hubloc_network = 'zot6' limit 1",
dbesc($AS->actor['id'])
- );
+ );
if(! $r) {
$y = import_author_xchan([ 'url' => $AS->actor['id'] ]);
@@ -1791,7 +1779,7 @@ class Libzot {
$r = q("select hubloc_hash from hubloc where hubloc_id_url = '%s' and hubloc_network = 'zot6' limit 1",
dbesc($AS->actor['id'])
);
- }
+ }
if(! $r) {
logger('FOF Activity: no actor');
continue;
@@ -1813,7 +1801,7 @@ class Libzot {
$s = q("select hubloc_hash from hubloc where hubloc_id_url = '%s' and hubloc_network = 'zot6' limit 1",
dbesc($a['signature']['signer'])
- );
+ );
if($s) {
$arr['owner_xchan'] = $s[0]['hubloc_hash'];
@@ -1822,7 +1810,7 @@ class Libzot {
$arr['owner_xchan'] = $a['signature']['signer'];
}
- // @fixme - spoofable
+ /// @FIXME - spoofable
if($AS->data['hubloc']) {
$arr['item_verified'] = true;
}
@@ -1836,7 +1824,7 @@ class Libzot {
$result = self::process_delivery($arr['owner_xchan'],$arr, [ $channel['channel_portable_id'] ],false,false,true);
if ($result) {
$ret = array_merge($ret, $result);
- }
+ }
}
return $ret;
@@ -1853,8 +1841,8 @@ class Libzot {
* * \e int \b obj_type
* * \e int \b mid
* @param int $uid
+ * @return void
*/
-
static function remove_community_tag($sender, $arr, $uid) {
if(! (activity_match($arr['verb'], ACTIVITY_TAG) && ($arr['obj_type'] == ACTIVITY_OBJ_TAGTERM)))
@@ -1882,7 +1870,7 @@ class Libzot {
}
$i = $r[0];
-
+
if($i['target'])
$i['target'] = json_decode($i['target'],true);
if($i['object'])
@@ -1925,8 +1913,8 @@ class Libzot {
* @param array $orig
* @param int $uid
* @param boolean $tag_delivery
+ * @return void|array
*/
-
static function update_imported_item($sender, $item, $orig, $uid, $tag_delivery) {
// If this is a comment being updated, remove any privacy information
@@ -2066,7 +2054,7 @@ class Libzot {
}
foreach($deliveries as $d) {
-
+
$DR = new DReport(z_root(),$sender,$d,$arr['mid']);
$r = q("select * from channel where channel_portable_id = '%s' limit 1",
@@ -2085,7 +2073,7 @@ class Libzot {
if(! perm_is_allowed($channel['channel_id'],$sender,'post_mail')) {
- /*
+ /*
* Always allow somebody to reply if you initiated the conversation. It's anti-social
* and a bit rude to send a private message to somebody and block their ability to respond.
* If you are being harrassed and want to put an end to it, delete the conversation.
@@ -2145,12 +2133,13 @@ class Libzot {
* @brief Processes delivery of profile.
*
* @see import_directory_profile()
+ *
* @param array $sender an associative array
* * \e string \b hash a xchan_hash
* @param array $arr
* @param array $deliveries (unused)
+ * @return void
*/
-
static function process_profile_delivery($sender, $arr, $deliveries) {
logger('process_profile_delivery', LOGGER_DEBUG);
@@ -2171,6 +2160,7 @@ class Libzot {
* * \e string \b hash a xchan_hash
* @param array $arr
* @param array $deliveries (unused) deliveries is irrelevant
+ * @return void
*/
static function process_location_delivery($sender, $arr, $deliveries) {
@@ -2188,7 +2178,7 @@ class Libzot {
$x = Libsync::sync_locations($xchan,$arr,true);
logger('results: ' . print_r($x,true), LOGGER_DEBUG);
if($x['changed']) {
- $guid = random_string() . '@' . App::get_hostname();
+ //$guid = random_string() . '@' . App::get_hostname();
Libzotdir::update_modtime($sender,$r[0]['xchan_guid'],$arr['locations'][0]['address'],UPDATE_FLAGS_UPDATED);
}
}
@@ -2212,8 +2202,8 @@ class Libzot {
*
* @param string $sender_hash A channel hash
* @param array $locations
+ * @return void
*/
-
static function check_location_move($sender_hash, $locations) {
if(! $locations)
@@ -2255,7 +2245,6 @@ class Libzot {
}
-
/**
* @brief Returns an array with all known distinct hubs for this channel.
*
@@ -2264,7 +2253,6 @@ class Libzot {
* * \e string \b channel_hash the hash of the channel
* @return array an array with associative arrays
*/
-
static function encode_locations($channel) {
$ret = [];
@@ -2305,7 +2293,7 @@ class Libzot {
if(! $z['site_id']) {
$z['site_id'] = Libzot::make_xchan_hash($z['url'],$z['sitekey']);
}
-
+
$ret[] = $z;
}
}
@@ -2318,10 +2306,8 @@ class Libzot {
* @brief
*
* @param array $arr
- * @param string $pubkey
* @return boolean true if updated or inserted
*/
-
static function import_site($arr) {
if( (! is_array($arr)) || (! $arr['url']) || (! $arr['site_sig']))
@@ -2600,16 +2586,16 @@ class Libzot {
dbesc($ztarget)
);
if($t) {
-
+
$ztarget_hash = $t[0]['hubloc_hash'];
}
else {
-
+
// should probably perform discovery of the requestor (target) but if they actually had
- // permissions we would know about them and we only want to know who they are to
+ // permissions we would know about them and we only want to know who they are to
// enumerate their specific permissions
-
+
$ztarget_hash = EMPTY_STR;
}
}
@@ -2756,7 +2742,7 @@ class Libzot {
$ret['id'] = $e['xchan_guid'];
$ret['id_sig'] = self::sign($e['xchan_guid'], $e['channel_prvkey']);
- $ret['primary_location'] = [
+ $ret['primary_location'] = [
'address' => $e['xchan_addr'],
'url' => $e['xchan_url'],
'connections_url' => $e['xchan_connurl'],
@@ -2778,7 +2764,7 @@ class Libzot {
$ret['searchable'] = $searchable;
$ret['adult_content'] = $adult_channel;
$ret['public_forum'] = $public_forum;
-
+
$ret['comments'] = map_scope(PermissionLimits::Get($e['channel_id'],'post_comments'));
$ret['mail'] = map_scope(PermissionLimits::Get($e['channel_id'],'post_mail'));
@@ -2836,14 +2822,20 @@ class Libzot {
$ret['locations'] = $x;
$ret['site'] = self::site_info();
+ /**
+ * @hooks zotinfo
+ * Hook to manipulate the zotinfo array before it is returned.
+ */
+ call_hooks('zotinfo', $ret);
- call_hooks('zotinfo',$ret);
-
- return($ret);
-
+ return $ret;
}
-
+ /**
+ * @brief Get siteinfo.
+ *
+ * @return array
+ */
static function site_info() {
$signing_key = get_config('system','prvkey');
@@ -2880,7 +2872,7 @@ class Libzot {
if($dirmode != DIRECTORY_MODE_STANDALONE) {
$register_policy = intval(get_config('system','register_policy'));
-
+
if($register_policy == REGISTER_CLOSED)
$ret['site']['register_policy'] = 'closed';
if($register_policy == REGISTER_APPROVE)
@@ -2927,18 +2919,16 @@ class Libzot {
}
return $ret['site'];
-
}
/**
* @brief
*
* @param array $hub
- * @param string $sitekey (optional, default empty)
+ * @param string $site_id (optional, default empty)
*
* @return string hubloc_url
*/
-
static function update_hub_connected($hub, $site_id = '') {
if ($site_id) {
@@ -2997,12 +2987,21 @@ class Libzot {
return $hub['hubloc_url'];
}
-
+ /**
+ * @brief
+ *
+ * @param string $data
+ * @param string $key
+ * @param string $alg (optional) default 'sha256'
+ * @return string
+ */
static function sign($data,$key,$alg = 'sha256') {
if(! $key)
return 'no key';
+
$sig = '';
openssl_sign($data,$sig,$key,$alg);
+
return $alg . '.' . base64url_encode($sig);
}
@@ -3015,24 +3014,27 @@ class Libzot {
if ($key && count($x) === 2) {
$alg = $x[0];
$signature = base64url_decode($x[1]);
-
+
$verify = @openssl_verify($data,$signature,$key,$alg);
if ($verify === (-1)) {
while ($msg = openssl_error_string()) {
logger('openssl_verify: ' . $msg,LOGGER_NORMAL,LOG_ERR);
}
- btlogger('openssl_verify: key: ' . $key, LOGGER_DEBUG, LOG_ERR);
+ btlogger('openssl_verify: key: ' . $key, LOGGER_DEBUG, LOG_ERR);
}
}
return(($verify > 0) ? true : false);
}
-
-
+ /**
+ * @brief
+ *
+ * @return boolean
+ */
static function is_zot_request() {
-
$x = getBestSupportedMimeType([ 'application/x-zot+json' ]);
+
return(($x) ? true : false);
}