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<?php
/**
*
* @function zot_new_uid($channel_nick)
* @channel_id = unique nickname of controlling entity
* @returns string
*
*/
function zot_new_uid($channel_nick) {
$rawstr = z_root() . '/' . $channel_nick . '.' . mt_rand();
return(base64url_encode(hash('whirlpool',$rawstr,true),true));
}
/**
*
* Given an array of zot_uid(s), return all distinct hubs
* If primary is true, return only primary hubs
* Result is ordered by url to assist in batching.
* Return only the first primary hub as there should only be one.
*
*/
function zot_get_hubloc($arr,$primary = false) {
$tmp = '';
if(is_array($arr)) {
foreach($arr as $e) {
if(strlen($tmp))
$tmp .= ',';
$tmp .= "'" . dbesc($e) . "'" ;
}
}
if(! strlen($tmp))
return array();
$sql_extra = (($primary) ? " and hubloc_flags & " . intval(HUBLOC_FLAGS_PRIMARY) : "" );
$limit = (($primary) ? " limit 1 " : "");
return q("select * from hubloc where hubloc_guid in ( $tmp ) $sql_extra order by hubloc_url $limit");
}
// Given an item and an identity, sign the data.
function zot_sign(&$item,$identity) {
$item['signed'] = str_replace(array(" ","\t","\n","\r"),array('','','',''),base64url_encode($item['body'],true));
$item['signature'] = base64url_encode(rsa_sign($item['signed'],$identity['prvkey']));
}
// Given an item and an identity, verify the signature.
function zot_verify(&$item,$identity) {
return rsa_verify($item['signed'],base64url_decode($item['signature']),$identity['pubkey']);
}
function zot_notify($channel,$url) {
$x = z_post_url($url, array(
'type' => 'notify',
'guid' => $channel['channel_guid'],
'guid_sig' => base64url_encode($guid,$channel['prvkey']),
'hub' => z_root(),
'hub_sig' => base64url_encode(z_root,$channel['prvkey']),
'callback' => '/post',
'spec' => ZOT_REVISION)
);
return($x);
}
function zot_gethub($arr) {
if((x($arr,'guid')) && (x($arr,'guid_sig')) && (x($arr,'hub')) && (x($arr,'hub_sig'))) {
$r = q("select * from hubloc
where hubloc_guid = '%s' and hubloc_guid_sig = '%s'
and hubloc_url = '%s' and hubloc_url_sig = '%s'
limit 1",
dbesc($arr['guid']),
dbesc($arr['guid_sig']),
dbesc($arr['hub']),
dbesc($arr['hub_sig'])
);
if($r && count($r))
return $r[0];
}
return null;
}
function zot_register_hub($arr) {
$total = 0;
if((x($arr,'hub')) && (x($arr,'guid'))) {
$x = z_fetch_url($arr['hub'] . '/.well-known/zot-guid/' . $arr['guid']);
if($x['success']) {
$record = json_decode($x['body']);
if($record->hub && count($record->hub)) {
foreach($record->hub as $h) {
// store any hubs we don't know about
if( ! zot_gethub(
array('guid' => $arr['guid'],
'guid_sig' => $arr['guid_sig'],
'hub' => $h->url,
'hub_sig' => $h->url_sig))) {
$r = q("insert into hubloc (hubloc_guid, hubloc_guid_sig, hubloc_flags, hubloc_url,
hubloc_url_sig, hubloc_callback, hubloc_sitekey, hubloc_key)
values ( '%s', '%s', %d, '%s', '%s', '%s', '%s', '%s' )",
dbesc($arr['guid']),
dbesc($arr['guid_sig']),
intval((($h->primary) ? HUBLOC_FLAGS_PRIMARY : 0) | HUBLOC_FLAGS_UNVERIFIED ),
dbesc($h->url),
dbesc($h->url_sig),
dbesc($h->callback),
dbesc($h->sitekey),
dbesc($record->key)
);
if($r)
$total ++;
}
}
}
}
}
return $total;
}
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