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<?php
require_once('include/text.php');
function zot_get($url,$args) {
$argstr = '';
foreach($args as $k => $v) {
if($argstr)
$argstr .= '&';
$argstr .= $k . '=' . $v;
}
$s = fetch_url($url . '?' . $argstr);
if($s) {
$j = json_decode($s);
if($j)
return($j);
}
return false;
}
function zot_post($url,$args) {
$s = post_url($url,$args);
if($s) {
$j = json_decode($s);
if($j)
return($j);
}
return false;
}
function zot_prv_encode($s,$prvkey) {
$x = '';
$res = openssl_private_encrypt($s,$x,$prvkey);
return base64url_encode($y);
}
function zot_pub_encode($s,$pubkey) {
$x = '';
$res = openssl_public_encrypt($s,$x,$pubkey);
return base64url_encode($x);
}
function zot_prv_decode($s,$prvkey) {
$s = base64url_decode($s);
$x = '';
openssl_private_decrypt($s,$x,$prvkey);
return $x;
}
function zot_pub_decode($s,$pubkey) {
$s = base64url_decode($s);
$x = '';
openssl_public_decrypt($s,$x,$pubkey);
return $x;
}
function zot_getzid($url,$myaddress,$myprvkey) {
$ret = array();
$j = zot_get($url,array('sender' => $myaddress));
if($j->zid_encoded)
$ret['zid'] = zot_prv_decode($j->zid_encoded,$myprvkey);
if($j->zkey_encoded)
$ret['zkey'] = zot_prv_decode($j->zkey_encoded,$myprvkey);
return $ret;
}
function zot_post_init($url,$zid,$myprvkey,$theirpubkey) {
$ret = array();
$zinit = random_string(32);
$j = zot_get($url,array('zid' => $zid,'zinit' => $zinit));
$a = get_app();
if(! $a->get_curl_code())
return ZCURL_TIMEOUT;
if(! $j->zinit) {
logger('zot_post_init: no zinit returned.');
return false;
}
if(zot_pub_decode($j->zinit,$thierpubkey) !== $zinit) {
logger('zot_post_init: incorrect zinit returned.');
return false;
}
if($j->challenge) {
$s = zot_prv_decode($j->challenge,$myprvkey);
$s1 = substr($s,0,strpos($s,'.'));
if($s1 != $zid) {
logger("zot_post_init: incorrect zid returned");
return false;
}
$ret['result'] = substr($s,strpos($s,'.') + 1);
$ret['perms'] = $j->perms;
}
return $ret;
}
function zot_encrypt_data($data,&$key) {
$key = random_string();
return aes_encrypt($data,$key);
}
// encrypt the data prior to calling this function so it only need be done once per message
// regardless of the number of recipients.
function zot_post_data($url,$zid,$myprvkey,$theirpubkey,$encrypted_data,$key, $intro = false) {
$i = zot_post_init($url,$zid,$myprvkey,$theirpubkey);
if($i === ZCURL_TIMEOUT)
return ZCURL_TIMEOUT;
if((! $i) || (! array_key_exists('perms',$i)) || (! array_key_exists('result',$i)))
return false;
if((! stristr($i['perms'],'post')) && ($intro === false)) {
logger("zot_post_data: no permission to post: url=$url zid=$zid");
return false;
}
$p = array();
$p['zid'] = $zid;
$p['result'] = zot_pub_encode($i['result'],$theirpubkey);
$p['aes_key'] = zot_prv_encode($key,$myprvkey);
$p['data'] = $encrypted_data;
$s = zot_post($url,$p);
$a = get_app();
if(! $a->get_curl_code())
return ZCURL_TIMEOUT;
if($s) {
$j = json_decode($s);
return $j;
}
return false;
}
function zot_deliver($recipients,$myprvkey,$data) {
if(is_array($recipients) && count($recipients)) {
$key = '';
$encrypted = zot_encrypt_data($data,$key);
foreach($recipients as $r) {
$result = zot_post_data(
$r['post'],
$r['zid'],
$myprvkey,
$r['pubkey'],
$encrypted,
$key
);
if($result === false) {
// post failed
logger('zot_deliver: failed: ' . print_r($r,true));
}
elseif($result === ZCURL_TIMEOUT) {
// queue for redelivery
}
elseif($result->error) {
// failed at other end
logger('zot_deliver: remote failure: ' . $result->error . ' ' . print_r($r,true));
}
elseif($result->success) {
logger('zot_deliver: success ' . print_r($r,true, LOGGER_DEBUG));
}
else
logger('zot_deliver: unknown failure.');
}
}
}
function zot_new_contact($user,$cc) {
$zid = random_string(32);
$zkey = random_string(32);
logger("zot_new_contact: zid=$zid zkey=$zkey uid={$user['uid']} " . print_r($cc,true));
$ret = array();
$ret['zid_encoded'] = zot_pub_encode($zid,$cc['pubkey']);
$ret['zkey_encoded'] = zot_pub_encode($zkey,$cc['pubkey']);
return $ret;
}
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