function LDP_get_prefix($path, $uri, $type = 'http://ns.rww.io/ldpx#ldprPrefix')
{
if ($path && $uri) {
$g = new Graph('', $path, '', $uri);
if ($g->size() > 0) {
// specific authorization
$q = 'SELECT ?s, ?prefix WHERE { ?s <' . $type . '> ?prefix }';
$s = $g->SELECT($q);
$res = $s['results']['bindings'];
if (isset($res) && count($res) > 0) {
return $res[0]['prefix']['value'];
}
}
}
return null;
}
function webid_getinfo($uri)
{
$g = new Graph('uri', $uri, '', $uri);
$q = $g->SELECT(sprintf("PREFIX : <http://xmlns.com/foaf/0.1/>\n SELECT ?name ?pic ?depic FROM <%s> WHERE { \n ?s a :Person .\n FILTER (?s = <%s>) .\n OPTIONAL { ?s :name ?name } . \n OPTIONAL { ?s :img ?pic } .\n OPTIONAL { ?s :depiction ?depic } .\n }", $uri, $uri));
if (isset($q['results']) && isset($q['results']['bindings'])) {
$r = $q['results']['bindings'];
}
if (isset($r) && is_array($r) && sizeof($r) > 0) {
$name = $r[0]['name']['value'];
$pic = $r[0]['pic']['value'];
$depic = $r[0]['depic']['value'];
if (strlen($name) == 0) {
$name = 'No name';
}
if (strlen($pic) == 0) {
$pic = strlen($depic) > 0 ? $depic : '/common/images/nouser.png';
}
} else {
$name = '';
$pic = '/common/images/nouser.png';
}
return array('name' => $name, 'pic' => $pic);
}
$g->append('turtle', "@prefix p: <http://www.w3.org/ns/posix/stat#> . <" . $properties['resource'] . "> a " . $properties['type'] . " ; p:mtime " . $properties['mtime'] . " ; p:size " . $properties['size'] . " .");
}
// add ldp:contains triple to the LDPC
if ($show_containment) {
$g->append('turtle', "<" . $_base . "> <http://www.w3.org/ns/ldp#contains> <" . $properties['resource'] . "> . ");
}
// add resource type from resources containing metadata
if ($properties['type'] != 'p:File') {
if ($properties['type'] == 'p:Directory') {
$meta_uri = dirname($properties['uri']) . '/.meta.' . basename($properties['uri']);
$meta_file = $_filename . '.meta.' . basename($properties['resource']);
} else {
$meta_uri = $properties['uri'];
$meta_file = $_filename . basename($properties['resource']);
}
$dg = new Graph('', $meta_file, '', $meta_uri);
if ($dg->size() > 0) {
$q = 'SELECT * WHERE { <' . $properties['resource'] . '> ?p ?o }';
$s = $dg->SELECT($q);
$res = $s['results']['bindings'];
// add the resource type
if (isset($res) && count($res) > 0) {
foreach ($res as $t) {
if ($t['p']['value'] == 'http://www.w3.org/1999/02/22-rdf-syntax-ns#type') {
$g->append_objects($properties['uri'], $t['p']['value'], array($t['o']));
}
}
}
}
}
}
/**
* Check if the user has access to a specific URI
* @param string $method Read/Write/Append/Control
* @param array $options local configuration options
* @param string $uri the URI of the resource
*
* @return boolean (true if user has access)
*/
function can($method)
{
$this->_debug[] = "Method=" . $method;
// check if we are the domain owner
if (is_file($this->_root_path . '.acl')) {
$g = new Graph('', $this->_root_path . '.acl', '', $this->_root_uri . '.acl');
if ($g->size() > 0) {
// for the domain owner
$this->_debug[] = "Graph size=" . $g->size();
$q = "PREFIX acl: <http://www.w3.org/ns/auth/acl#>\n SELECT ?z WHERE { \n ?z acl:agent <" . $this->_user . "> .\n }";
$r = $g->SELECT($q);
if (isset($r['results']['bindings']) && count($r['results']['bindings']) > 0) {
$this->_reason .= "User " . $this->_user . " was authenticated as owner!";
return true;
}
}
}
// Recursively find a .acl
$path = $this->_path;
$uri = $this->_uri;
$parent_path = dirname($path) == $this->_root_path ? $path : dirname($path);
$parent_uri = dirname($uri) == $this->_root_uri ? $uri : dirname($uri);
$break = false;
// debug
$this->_debug[] = " ";
$this->_debug[] = "------------";
$this->_debug[] = "Not the owner, going recursively! BASE=" . $this->_path;
$this->_debug[] = "User is: " . $this->_user;
// walk path (force stop if we hit root level)
while ($path != dirname($this->_root_path)) {
if ($break == true) {
return true;
}
$r = $path;
$this->_debug[] = "------------";
$this->_debug[] = "Current level: " . $r;
$resource = $uri;
if ($r != $this->_root_path) {
$path = dirname($path) == $this->_root_path ? $path : dirname($path) . '/';
$this->_debug[] = "PATH=" . $path . " / ROOT_PATH=" . $this->_root_path;
$acl_file = substr(basename($r), 0, 4) != '.acl' ? '.acl.' . basename($r) : basename($r);
$acl_path = $path . $acl_file;
$acl_uri = dirname($uri) == $this->_root_uri ? $acl_file : dirname($uri) . '/' . $acl_file;
$this->_debug[] = "Dir=" . $r . " | acl_path=" . $acl_path . " | acl_uri=" . $acl_uri;
$uri = dirname($uri) == $this->_root_uri ? $uri : dirname($uri) . '/';
$this->_debug[] = 'Parent_path=' . $path . ' | parent_uri=' . $uri;
/*
$acl_file = (substr(basename($r), 0, 4) != '.acl')?'/.acl.'.basename($r):'/'.basename($r);
$acl_path = $parent_path.$acl_file;
$acl_uri = (dirname($uri) == $this->_root_uri)?$acl_file:dirname($uri).$acl_file;
$this->_debug[] = "Dir=".$r." | acl_path=".$acl_path." | acl_uri=".$acl_uri;
$path = (dirname($path) == $this->_root_path)?$path:dirname($path).'/';
$uri = (dirname($uri) == $this->_root_uri)?$uri:dirname($uri).'/';
$this->_debug[] = 'Parent_path='.$path.' | parent_uri='.$uri;
*/
} else {
$acl_path = $r . '.acl';
$acl_uri = $uri . '.acl';
$this->_debug[] = "ROOT Dir=" . $r . " | acl_path=" . $acl_path . " | acl_uri=" . $acl_uri;
if ($path == $this->_root_path) {
$break = true;
}
}
if ($r == $this->_path) {
$verb = 'accessTo';
} else {
$verb = 'defaultForNew';
if (substr($resource, -1) != '/') {
$resource = $resource . '/';
}
}
$this->_debug[] = "Verb=" . $verb . " | Resource=" . $resource;
if (is_file($acl_path)) {
$g = new Graph('', $acl_path, '', $acl_uri);
if ($g->size() > 0) {
// specific authorization
$q = "PREFIX acl: <http://www.w3.org/ns/auth/acl#>" . "SELECT * WHERE { " . "?z acl:agent <" . $this->_user . "> ; " . "acl:mode acl:" . $method . " ; " . "acl:" . $verb . " <" . $resource . "> . " . "}";
$this->_debug[] = $q;
$res = $g->SELECT($q);
if (isset($res['results']['bindings']) && count($res['results']['bindings']) > 0) {
$this->_reason .= 'User ' . $this->_user . ' is allowed (' . $method . ') access to ' . $r . "\n";
return true;
}
// public authorization
$q = "PREFIX acl: <http://www.w3.org/ns/auth/acl#>" . "SELECT * WHERE { " . "?z acl:agentClass <http://xmlns.com/foaf/0.1/Agent>; " . "acl:mode acl:" . $method . "; " . "acl:" . $verb . " <" . $resource . "> . " . "}";
$this->_debug[] = $q;
$res = $g->SELECT($q);
if (isset($res['results']['bindings']) && count($res['results']['bindings']) > 0) {
$this->_reason .= 'Everyone is allowed (' . $method . ') ' . $verb . ' to ' . $r . "\n";
return true;
}
$this->_reason = 'No one is allowed (' . $verb . ') ' . $method . ' for resource ' . $this->_uri . "\n";
return false;
}
}
}
}
