+ $t = str_replace('<','',$s);
+ $a = explode('>',$t);
+ foreach($a as $aa) {
+ if(intval($aa))
+ $ret[] = intval($aa);
+ }
+ }
+ return $ret;
+}}
+
+// Used to wrap ACL elements in angle brackets for storage
+
+if(! function_exists('sanitise_acl')) {
+function sanitise_acl(&$item) {
+ if(intval($item))
+ $item = '<' . intval(notags(trim($item))) . '>';
+ else
+ unset($item);
+}}
+
+// retrieve a "family" of config variables from database to cached storage
+
+if(! function_exists('load_config')) {
+function load_config($family) {
+ global $a;
+ $r = q("SELECT * FROM `config` WHERE `cat` = '%s'",
+ dbesc($family)
+ );
+ if(count($r)) {
+ foreach($r as $rr) {
+ $k = $rr['k'];
+ $a->config[$family][$k] = $rr['v'];
+ }
+ }
+}}
+
+// get a particular config variable given the family name
+// and key. Returns false if not set.
+// $instore is only used by the set_config function
+// to determine if the key already exists in the DB
+// If a key is found in the DB but doesn't exist in
+// local config cache, pull it into the cache so we don't have
+// to hit the DB again for this item.
+
+if(! function_exists('get_config')) {
+function get_config($family, $key, $instore = false) {
+
+ global $a;
+
+ if(! $instore) {
+ if(isset($a->config[$family][$key])) {
+ if($a->config[$family][$key] === '!<unset>!') {
+ return false;
+ }
+ return $a->config[$family][$key];
+ }
+ }
+ $ret = q("SELECT `v` FROM `config` WHERE `cat` = '%s' AND `k` = '%s' LIMIT 1",
+ dbesc($family),
+ dbesc($key)
+ );
+ if(count($ret)) {
+ $a->config[$family][$key] = $ret[0]['v'];
+ return $ret[0]['v'];
+ }
+ else {
+ $a->config[$family][$key] = '!<unset>!';
+ }
+ return false;
+}}
+
+// Store a config value ($value) in the category ($family)
+// under the key ($key)
+// Return the value, or false if the database update failed
+
+if(! function_exists('set_config')) {
+function set_config($family,$key,$value) {
+
+ global $a;
+ $a->config[$family][$key] = $value;
+
+ if(get_config($family,$key,true) === false) {
+ $ret = q("INSERT INTO `config` ( `cat`, `k`, `v` ) VALUES ( '%s', '%s', '%s' ) ",
+ dbesc($family),
+ dbesc($key),
+ dbesc($value)
+ );
+ if($ret)
+ return $value;
+ return $ret;
+ }
+ $ret = q("UPDATE `config` SET `v` = '%s' WHERE `cat` = '%s' AND `k` = '%s' LIMIT 1",
+ dbesc($value),
+ dbesc($family),
+ dbesc($key)
+ );
+ if($ret)
+ return $value;
+ return $ret;
+}}
+
+// convert an XML document to a normalised, case-corrected array
+// used by webfinger
+
+if(! function_exists('convert_xml_element_to_array')) {
+function convert_xml_element_to_array($xml_element, &$recursion_depth=0) {
+
+ // If we're getting too deep, bail out
+ if ($recursion_depth > 512) {
+ return(null);
+ }
+
+ if (!is_string($xml_element) &&
+ !is_array($xml_element) &&
+ (get_class($xml_element) == 'SimpleXMLElement')) {
+ $xml_element_copy = $xml_element;
+ $xml_element = get_object_vars($xml_element);
+ }
+
+ if (is_array($xml_element)) {
+ $result_array = array();
+ if (count($xml_element) <= 0) {
+ return (trim(strval($xml_element_copy)));
+ }
+
+ foreach($xml_element as $key=>$value) {
+
+ $recursion_depth++;
+ $result_array[strtolower($key)] =
+ convert_xml_element_to_array($value, $recursion_depth);
+ $recursion_depth--;
+ }
+ if ($recursion_depth == 0) {
+ $temp_array = $result_array;
+ $result_array = array(
+ strtolower($xml_element_copy->getName()) => $temp_array,
+ );
+ }
+
+ return ($result_array);
+
+ } else {
+ return (trim(strval($xml_element)));
+ }
+}}
+
+// Given an email style address, perform webfinger lookup and
+// return the resulting DFRN profile URL.
+// If this isn't an email style address just return $s.
+// Return an empty string if email-style addresses but webfinger fails,
+// or if the resultant personal XRD doesn't contain a DFRN profile.
+
+if(! function_exists('webfinger')) {
+function webfinger($s) {
+ if(! strstr($s,'@')) {
+ return $s;
+ }
+ $host = substr($s,strpos($s,'@') + 1);
+ $url = 'http://' . $host . '/.well-known/host-meta' ;
+ $xml = fetch_url($url);
+ if (! $xml)
+ return '';
+ $h = simplexml_load_string($xml);
+ $arr = convert_xml_element_to_array($h);
+
+ if(! isset($arr['xrd']['link']))
+ return '';
+
+ $link = $arr['xrd']['link'];
+ if(! isset($link[0]))
+ $links = array($link);
+ else
+ $links = $link;
+
+ foreach($links as $link)
+ if($link['@attributes']['rel'] && $link['@attributes']['rel'] === 'lrdd')
+ $tpl = $link['@attributes']['template'];
+ if((empty($tpl)) || (! strpos($tpl, '{uri}')))
+ return '';
+
+ $pxrd = str_replace('{uri}', urlencode('acct://'.$s), $tpl);
+
+ $xml = fetch_url($pxrd);
+ if (! $xml)
+ return '';
+ $h = simplexml_load_string($xml);
+ $arr = convert_xml_element_to_array($h);
+
+ if(! isset($arr['xrd']['link']))
+ return '';
+
+ $link = $arr['xrd']['link'];
+ if(! isset($link[0]))
+ $links = array($link);
+ else
+ $links = $link;
+
+ foreach($links as $link)
+ if($link['@attributes']['rel'] == NAMESPACE_DFRN)
+ return $link['@attributes']['href'];
+ return '';
+}}
+
+
+// Convert an ACL array to a storable string
+
+if(! function_exists('perms2str')) {
+function perms2str($p) {
+ $ret = '';
+ $tmp = $p;
+ if(is_array($tmp)) {
+ array_walk($tmp,'sanitise_acl');
+ $ret = implode('',$tmp);
+ }
+ return $ret;
+}}
+
+// generate a guaranteed unique (for this domain) item ID for ATOM
+// safe from birthday paradox
+
+if(! function_exists('item_new_uri')) {
+function item_new_uri($hostname,$uid) {
+
+ do {
+ $dups = false;
+ $hash = random_string();
+
+ $uri = "urn:X-dfrn:" . $hostname . ':' . $uid . ':' . $hash;
+
+ $r = q("SELECT `id` FROM `item` WHERE `uri` = '%s' LIMIT 1",
+ dbesc($uri));
+ if(count($r))
+ $dups = true;
+ } while($dups == true);
+ return $uri;
+}}
+
+// Generate a guaranteed unique photo ID.
+// safe from birthday paradox
+
+if(! function_exists('photo_new_resource')) {
+function photo_new_resource() {
+
+ do {
+ $found = false;
+ $resource = hash('md5',uniqid(mt_rand(),true));
+ $r = q("SELECT `id` FROM `photo` WHERE `resource-id` = '%s' LIMIT 1",
+ dbesc($resource)
+ );
+ if(count($r))
+ $found = true;
+ } while($found == true);
+ return $resource;
+}}
+
+
+// Returns logged in user ID
+
+if(! function_exists('get_uid')) {
+function get_uid() {
+ return ((x($_SESSION,'uid')) ? intval($_SESSION['uid']) : 0) ;
+}}
+
+// Take a URL from the wild, prepend http:// if necessary
+// and check DNS to see if it's real
+// return true if it's OK, false if something is wrong with it
+
+if(! function_exists('validate_url')) {
+function validate_url(&$url) {
+ if(substr($url,0,4) != 'http')
+ $url = 'http://' . $url;
+ $h = parse_url($url);
+
+ if(! $h) {
+ return false;
+ }
+ if(! checkdnsrr($h['host'], 'ANY')) {
+ return false;
+ }
+ return true;
+}}
+
+// Check $url against our list of allowed sites,
+// wildcards allowed. If allowed_sites is unset return true;
+// If url is allowed, return true.
+// otherwise, return false
+
+if(! function_exists('allowed_url')) {
+function allowed_url($url) {
+
+ $h = parse_url($url);
+
+ if(! $h) {
+ return false;
+ }
+
+ $str_allowed = get_config('system','allowed_sites');
+ if(! $str_allowed)
+ return true;
+
+ $found = false;
+
+ $host = strtolower($h['host']);
+
+ // always allow our own site
+
+ if($host == strtolower($_SERVER['SERVER_NAME']))
+ return true;
+
+ $fnmatch = function_exists('fnmatch');
+ $allowed = explode(',',$str_allowed);
+
+ if(count($allowed)) {
+ foreach($allowed as $a) {
+ $pat = strtolower(trim($a));
+ if(($fnmatch && fnmatch($pat,$host)) || ($pat == $host)) {
+ $found = true;
+ break;
+ }
+ }
+ }
+ return $found;
+}}
+
+// check if email address is allowed to register here.
+// Compare against our list (wildcards allowed).
+// Returns false if not allowed, true if allowed or if
+// allowed list is not configured.
+
+if(! function_exists('allowed_email')) {
+function allowed_email($email) {
+
+
+ $domain = strtolower(substr($email,strpos($email,'@') + 1));
+ if(! $domain)
+ return false;
+
+ $str_allowed = get_config('system','allowed_email');
+ if(! $str_allowed)
+ return true;
+
+ $found = false;
+
+ $fnmatch = function_exists('fnmatch');
+ $allowed = explode(',',$str_allowed);
+
+ if(count($allowed)) {
+ foreach($allowed as $a) {
+ $pat = strtolower(trim($a));
+ if(($fnmatch && fnmatch($pat,$host)) || ($pat == $host)) {
+ $found = true;
+ break;
+ }