function remoteURI($uid, $key, $user_id, $db)
{
#function remoteURI performs a call on a remote Did for retrieving information on a specific s3id
#syntax: remoteURI($uid, $key, $db)
if (is_array($uid)) {
$uid_info = $uid;
} else {
$uid_info = uid_resolve($uid);
}
$local_user = S3DB_URI_BASE . '/' . 'U' . $user_id;
$letter = letter($uid_info['uid']);
$uid = $uid_info['uid'];
if (ereg('^[UGPCRIS]', $letter)) {
$numeric_id = substr($uid, 1, strlen($uid));
#if uid brings a letter, leave just a the id
$numeric_did = substr($uid_info['did'], 1, strlen($uid_info['did']));
}
##If Did is not a url, it must be found first
$a = @fopen($numeric_did, 'r');
if (!$a) {
list($did_url) = DidURL($uid_info, $db);
} else {
$did_url = $numeric_did;
fclose($a);
}
#First let's try calling the remote resource without authentication; it might be a public resource
$did_query = trim($did_url) . 'URI.php?uid=' . $uid . '&format=php';
$tmpH = @fopen($did_query, 'r');
if (!$tmpH) {
#could not read or is not an S3DB deployment
$return = "Deployment " . $did_url . " does not appear to be a valid url";
} else {
$tmpData = stream_get_contents($tmpH);
$uid_info = unserialize($tmpData);
$uid_info = $uid_info[0];
##when is a "no permission" error code, tyr again with the key; all others, exit
if ($uid_info['error_code'] != '' && $uid_info['error_code'] != '5') {
return $uid_info[0]['message'];
} elseif ($uid_info['error_code'] == '5') {
$did_query .= '?key=' . $key . '&user_id=' . $local_user;
$tmpH = @fopen($did_query, 'r');
$tmpData = stream_get_contents($tmpH);
$uid_info = unserialize($tmpData);
$uid_info = $uid_info[0];
}
$return = $uid_info;
}
#now update true url in local
if (!$did_is_local) {
insertDidUrl($did_info, $db);
} else {
if (!$did_is_recent) {
#if check was not valid, do not update that field
if ($tmpH) {
$did_info['checked_valid'] = date('Y-m-d G:i:s');
}
updateDidUrl($did_info, $db);
}
}
return $return;
}
function authenticate_remote_user($key, $url)
{
#URL contains info on user in the last part of the path. (for example: URL=https://ibl.mdanderson.org/s3db/U4)
#$user_id_info = uid($url);
$user_id_info = uid_resolve($url);
if (ereg_replace('^D', '', $user_id_info['Did']) == ereg_replace('^D', '', $GLOBALS['s3db_info']['deployment']['Did'])) {
#same uri as local, authentication failed
return 1;
exit;
}
$db = CreateObject('s3dbapi.db');
$db->Halt_On_Error = 'no';
$db->Host = $GLOBALS['s3db_info']['server']['db']['db_host'];
$db->Type = $GLOBALS['s3db_info']['server']['db']['db_type'];
$db->Database = $GLOBALS['s3db_info']['server']['db']['db_name'];
$db->User = $GLOBALS['s3db_info']['server']['db']['db_user'];
$db->Password = $GLOBALS['s3db_info']['server']['db']['db_pass'];
$db->connect();
#Find URL
list($did_url) = DidURL($user_id_info, $db);
if (!$did_url) {
return 4;
exit;
}
#Validate User in remote;
##This is done by calling the apifunction keyCheck, which requires a key and a user_id;
$call1 = $did_url . 'keyCheck.php?key=' . $key . '&user_id=' . $user_id_info['uid'] . '&format=php';
$tmpKC = @fopen($call1, 'r');
if (!$tmpKC) {
return 4;
exit;
}
$keyValidated = stream_get_contents($tmpKC);
$keyValidated = unserialize($keyValidated);
$keyValidated = $keyValidated[0];
if ($keyValidated['error_code'] == 0) {
#User was validated with uid associated with remote deployment; These users cannot write anything is this deployment and their permissions are limited to the resources they were granted permission on. A filter is implemented that can be changed by the creator (Remote)
insert_access_log(array('user_id' => $user_id_info['condensed'], 'db' => $db));
##Temporarily copy the key for this user
$I = array('key_id' => $key, 'account_id' => $user_id_info['condensed'], 'expires' => date('Y-m-d H:i:s', time() + 1 * 60 * 60), 'notes' => 'Key for remote user created automatically by the API. Expires in 1 hour.');
add_entry('access_keys', $I, $db);
delete_expired_keys($date, $db);
return 0;
exit;
} else {
return 1;
exit;
}
}