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ARC2_Reader.php
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<?php
/**
* ARC2 Web Client.
*
* @author Benjamin Nowack
* @license W3C Software License and GPL
* @homepage <https://github.com/semsol/arc2>
*
* @version 2010-11-16
*/
ARC2::inc('Class');
class ARC2_Reader extends ARC2_Class
{
public function __construct($a, &$caller)
{
parent::__construct($a, $caller);
}
public function __init()
{/* inc_path, proxy_host, proxy_port, proxy_skip, http_accept_header, http_user_agent_header, max_redirects */
parent::__init();
$this->http_method = $this->v('http_method', 'GET', $this->a);
$this->message_body = $this->v('message_body', '', $this->a);
$this->http_accept_header = $this->v('http_accept_header', 'Accept: application/rdf+xml; q=0.9, text/turtle; q=0.8, */*; q=0.1', $this->a);
$this->http_user_agent_header = $this->v('http_user_agent_header', 'User-Agent: ARC Reader (https://github.com/semsol/arc2)', $this->a);
$this->http_custom_headers = $this->v('http_custom_headers', '', $this->a);
$this->max_redirects = $this->v('max_redirects', 3, $this->a);
$this->format = $this->v('format', false, $this->a);
$this->redirects = [];
$this->stream_id = '';
$this->timeout = $this->v('reader_timeout', 30, $this->a);
$this->response_headers = [];
$this->digest_auth = 0;
$this->auth_infos = $this->v('reader_auth_infos', [], $this->a);
}
public function setHTTPMethod($v)
{
$this->http_method = $v;
}
public function setMessageBody($v)
{
$this->message_body = $v;
}
public function setAcceptHeader($v)
{
$this->http_accept_header = $v;
}
public function setCustomHeaders($v)
{
$this->http_custom_headers = $v;
}
public function addCustomHeaders($v)
{
if ($this->http_custom_headers) {
$this->http_custom_headers .= "\r\n";
}
$this->http_custom_headers .= $v;
}
public function activate($path, $data = '', $ping_only = 0, $timeout = 0)
{
$this->setCredentials($path);
$this->ping_only = $ping_only;
if ($timeout) {
$this->timeout = $timeout;
}
$id = md5($path.' '.$data);
if ($this->stream_id != $id) {
$this->stream_id = $id;
/* data uri? */
if (!$data && preg_match('/^data\:([^\,]+)\,(.*)$/', $path, $m)) {
$path = '';
$data = preg_match('/base64/', $m[1]) ? base64_decode($m[2]) : rawurldecode($m[2]);
}
$this->base = $this->calcBase($path);
$this->uri = $this->calcURI($path, $this->base);
$this->stream = ($data) ? $this->getDataStream($data) : $this->getSocketStream($this->base, $ping_only);
if ($this->stream && !$this->ping_only) {
$this->getFormat();
}
}
}
/*
* HTTP Basic/Digest + Proxy authorization can be defined in the
* arc_reader_credentials config setting:
'arc_reader_credentials' => array(
'http://basic.example.com/' => 'user:pass', // shortcut for type=basic
'http://digest.example.com/' => 'user::pass', // shortcut for type=digest
'http://proxy.example.com/' => array('type' => 'basic', 'proxy', 'user' => 'user', 'pass' => 'pass'),
),
*/
public function setCredentials($url)
{
if (!$creds = $this->v('arc_reader_credentials', [], $this->a)) {
return 0;
}
foreach ($creds as $pattern => $creds) {
/* digest shortcut (user::pass) */
if (!is_array($creds) && preg_match('/^(.+)\:\:(.+)$/', $creds, $m)) {
$creds = ['type' => 'digest', 'user' => $m[1], 'pass' => $m[2]];
}
/* basic shortcut (user:pass) */
if (!is_array($creds) && preg_match('/^(.+)\:(.+)$/', $creds, $m)) {
$creds = ['type' => 'basic', 'user' => $m[1], 'pass' => $m[2]];
}
if (!is_array($creds)) {
return 0;
}
$regex = '/'.preg_replace('/([\:\/\.\?])/', '\\\\\1', $pattern).'/';
if (!preg_match($regex, $url)) {
continue;
}
$mthd = 'set'.$this->camelCase($creds['type']).'AuthCredentials';
if (method_exists($this, $mthd)) {
$this->$mthd($creds, $url);
}
}
}
public function setBasicAuthCredentials($creds)
{
$auth = 'Basic '.base64_encode($creds['user'].':'.$creds['pass']);
$h = in_array('proxy', $creds) ? 'Proxy-Authorization' : 'Authorization';
$this->addCustomHeaders($h.': '.$auth);
//echo $h . ': ' . $auth . print_r($creds, 1);
}
public function setDigestAuthCredentials($creds, $url)
{
$path = $this->v1('path', '/', parse_url($url));
$auth = '';
$hs = $this->getResponseHeaders();
/* initial 401 */
$h = $this->v('www-authenticate', '', $hs);
if ($h && preg_match('/Digest/i', $h)) {
$auth = 'Digest ';
/* Digest realm="$realm", nonce="$nonce", qop="auth", opaque="$opaque" */
$ks = ['realm', 'nonce', 'opaque']; /* skipping qop, assuming "auth" */
foreach ($ks as $i => $k) {
$$k = preg_match('/'.$k.'=\"?([^\"]+)\"?/i', $h, $m) ? $m[1] : '';
$auth .= ($i ? ', ' : '').$k.'="'.$$k.'"';
$this->auth_infos[$k] = $$k;
}
$this->auth_infos['auth'] = $auth;
$this->auth_infos['request_count'] = 1;
}
/* initial 401 or repeated request */
if ($this->v('auth', 0, $this->auth_infos)) {
$qop = 'auth';
$auth = $this->auth_infos['auth'];
$rc = $this->auth_infos['request_count'];
$realm = $this->auth_infos['realm'];
$nonce = $this->auth_infos['nonce'];
$ha1 = md5($creds['user'].':'.$realm.':'.$creds['pass']);
$ha2 = md5($this->http_method.':'.$path);
$nc = dechex($rc);
$cnonce = dechex($rc * 2);
$resp = md5($ha1.':'.$nonce.':'.$nc.':'.$cnonce.':'.$qop.':'.$ha2);
$auth .= ', username="'.$creds['user'].'"'.
', uri="'.$path.'"'.
', qop='.$qop.''.
', nc='.$nc.
', cnonce="'.$cnonce.'"'.
', uri="'.$path.'"'.
', response="'.$resp.'"'.
'';
$this->auth_infos['request_count'] = $rc + 1;
}
if (!$auth) {
return 0;
}
$h = in_array('proxy', $creds) ? 'Proxy-Authorization' : 'Authorization';
$this->addCustomHeaders($h.': '.$auth);
}
public function useProxy($url)
{
if (!$this->v1('proxy_host', 0, $this->a)) {
return false;
}
$skips = $this->v1('proxy_skip', [], $this->a);
foreach ($skips as $skip) {
if (false !== strpos($url, $skip)) {
return false;
}
}
return true;
}
public function createStream($path, $data = '')
{
$this->base = $this->calcBase($path);
$this->stream = ($data) ? $this->getDataStream($data) : $this->getSocketStream($this->base);
}
public function getDataStream($data)
{
return ['type' => 'data', 'pos' => 0, 'headers' => [], 'size' => strlen($data), 'data' => $data, 'buffer' => ''];
}
public function getSocketStream($url)
{
if ('file://' == $url) {
return $this->addError('Error: file does not exists or is not accessible');
}
$parts = parse_url($url);
$mappings = ['file' => 'File', 'http' => 'HTTP', 'https' => 'HTTP'];
if ($scheme = $this->v(strtolower($parts['scheme']), '', $mappings)) {
return $this->m('get'.$scheme.'Socket', $url, $this->getDataStream(''));
}
}
public function getFileSocket($url)
{
$parts = parse_url($url);
$s = file_exists($parts['path']) ? @fopen($parts['path'], 'r') : false;
if (!$s) {
return $this->addError('Socket error: Could not open "'.$parts['path'].'"');
}
return ['type' => 'socket', 'socket' => &$s, 'headers' => [], 'pos' => 0, 'size' => filesize($parts['path']), 'buffer' => ''];
}
public function getHTTPSocket($url, $redirs = 0, $prev_parts = '')
{
$parts = $this->getURIPartsFromURIAndPreviousURIParts($url, $prev_parts);
if (!is_array($parts)) {
return false;
}
$nl = "\r\n";
$http_mthd = strtoupper($this->http_method);
if ($this->v1('user', 0, $parts) || $this->useProxy($url)) {
$h_code = $http_mthd.' '.$url;
} else {
$h_code = $http_mthd.' '.$this->v1('path', '/', $parts).(($v = $this->v1('query', 0, $parts)) ? '?'.$v : '').(($v = $this->v1('fragment', 0, $parts)) ? '#'.$v : '');
}
$scheme_default_port = ('https' == $parts['scheme']) ? 443 : 80;
$port_code = ($parts['port'] != $scheme_default_port) ? ':'.$parts['port'] : '';
$h_code .= ' HTTP/1.0'.$nl.
'Host: '.$parts['host'].$port_code.$nl.
(($v = $this->http_accept_header) ? $v.$nl : '').
(($v = $this->http_user_agent_header) && !preg_match('/User\-Agent\:/', $this->http_custom_headers) ? $v.$nl : '').
(('POST' == $http_mthd) ? 'Content-Length: '.strlen($this->message_body).$nl : '').
($this->http_custom_headers ? trim($this->http_custom_headers).$nl : '').
$nl.
'';
/* post body */
if ('POST' == $http_mthd) {
$h_code .= $this->message_body.$nl;
}
/* connect */
if ($this->useProxy($url)) {
$s = @fsockopen($this->a['proxy_host'], $this->a['proxy_port'], $errno, $errstr, $this->timeout);
} elseif (('https' == $parts['scheme']) && function_exists('stream_socket_client')) {
// SSL options via config array, code by Hannes Muehleisen ([email protected])
$context = stream_context_create();
foreach ($this->a as $k => $v) {
if (preg_match('/^arc_reader_ssl_(.+)$/', $k, $m)) {
stream_context_set_option($context, 'ssl', $m[1], $v);
}
}
$s = stream_socket_client('ssl://'.$parts['host'].':'.$parts['port'], $errno, $errstr, $this->timeout, STREAM_CLIENT_CONNECT, $context);
} elseif ('https' == $parts['scheme']) {
$s = @fsockopen('ssl://'.$parts['host'], $parts['port'], $errno, $errstr, $this->timeout);
} elseif ('http' == $parts['scheme']) {
$s = @fsockopen($parts['host'], $parts['port'], $errno, $errstr, $this->timeout);
}
if (!$s) {
return $this->addError('Socket error: Could not connect to "'.$url.'" (proxy: '.($this->useProxy($url) ? '1' : '0').'): '.$errstr);
}
/* request */
fwrite($s, $h_code);
/* timeout */
if ($this->timeout) {
//stream_set_blocking($s, false);
stream_set_timeout($s, $this->timeout);
}
/* response headers */
$h = [];
$this->response_headers = $h;
if (!$this->ping_only) {
do {
$line = trim(fgets($s, 4096));
$info = stream_get_meta_data($s);
if (preg_match("/^HTTP[^\s]+\s+([0-9]{1})([0-9]{2})(.*)$/i", $line, $m)) {/* response code */
$error = in_array($m[1], ['4', '5']) ? $m[1].$m[2].' '.$m[3] : '';
$error = ($m[1].$m[2] == '304') ? '304 '.$m[3] : $error;
$h['response-code'] = $m[1].$m[2];
$h['error'] = $error;
$h['redirect'] = ('3' == $m[1]) ? true : false;
} elseif (preg_match('/^([^\:]+)\:\s*(.*)$/', $line, $m)) {/* header */
$h_name = strtolower($m[1]);
if (!isset($h[$h_name])) {/* 1st value */
$h[$h_name] = trim($m[2]);
} elseif (!is_array($h[$h_name])) {/* 2nd value */
$h[$h_name] = [$h[$h_name], trim($m[2])];
} else {/* more values */
$h[$h_name][] = trim($m[2]);
}
}
} while (!$info['timed_out'] && !feof($s) && $line);
$h['format'] = strtolower(preg_replace('/^([^\s]+).*$/', '\\1', $this->v('content-type', '', $h)));
$h['encoding'] = preg_match('/(utf\-8|iso\-8859\-1|us\-ascii)/', $this->v('content-type', '', $h), $m) ? strtoupper($m[1]) : '';
$h['encoding'] = preg_match('/charset=\s*([^\s]+)/si', $this->v('content-type', '', $h), $m) ? strtoupper($m[1]) : $h['encoding'];
$this->response_headers = $h;
/* result */
if ($info['timed_out']) {
return $this->addError('Connection timed out after '.$this->timeout.' seconds');
}
/* error */
if ($v = $this->v('error', 0, $h)) {
/* digest auth */
/* 401 received */
if (preg_match('/Digest/i', $this->v('www-authenticate', '', $h)) && !$this->digest_auth) {
$this->setCredentials($url);
$this->digest_auth = 1;
return $this->getHTTPSocket($url);
}
return $this->addError($error.' "'.(!feof($s) ? trim(strip_tags(fread($s, 128))).'..."' : ''));
}
/* redirect */
if ($this->v('redirect', 0, $h) && ($new_url = $this->v1('location', 0, $h))) {
fclose($s);
$this->redirects[$url] = $new_url;
$this->base = $new_url;
if ($redirs > $this->max_redirects) {
return $this->addError('Max numbers of redirects exceeded.');
}
return $this->getHTTPSocket($new_url, $redirs + 1, $parts);
}
}
if ($this->timeout) {
stream_set_blocking($s, true);
}
return ['type' => 'socket', 'url' => $url, 'socket' => &$s, 'headers' => $h, 'pos' => 0, 'size' => $this->v('content-length', 0, $h), 'buffer' => ''];
}
public function getURIPartsFromURIAndPreviousURIParts($uri, $previous_uri_parts)
{
$parts = parse_url($uri);
/* relative redirect */
if (!isset($parts['port']) && $previous_uri_parts && (!isset($parts['scheme']) || $parts['scheme'] == $previous_uri_parts['scheme'])) {
/* only set the port if the scheme has not changed. If the scheme changes to https assuming the port will stay as port 80 is a bad idea */
$parts['port'] = $previous_uri_parts['port'];
}
if (!isset($parts['scheme']) && $previous_uri_parts) {
$parts['scheme'] = $previous_uri_parts['scheme'];
}
if (!isset($parts['host']) && $previous_uri_parts) {
$parts['host'] = $previous_uri_parts['host'];
}
/* no scheme */
if (!$this->v('scheme', '', $parts)) {
return $this->addError('Socket error: Missing URI scheme.');
}
/* port tweaks */
$parts['port'] = ('https' == $parts['scheme']) ? $this->v1('port', 443, $parts) : $this->v1('port', 80, $parts);
return $parts;
}
public function readStream($buffer_xml = true, $d_size = 1024)
{
//if (!$s = $this->v('stream')) return '';
if (!$s = $this->v('stream')) {
return $this->addError('missing stream in "readStream" '.$this->uri);
}
$s_type = $this->v('type', '', $s);
$r = $s['buffer'];
$s['buffer'] = '';
if ($s['size']) {
$d_size = min($d_size, $s['size'] - $s['pos']);
}
/* data */
if ('data' == $s_type) {
$d = ($d_size > 0) ? substr($s['data'], $s['pos'], $d_size) : '';
}
/* socket */
elseif ('socket' == $s_type) {
$d = ($d_size > 0) && !feof($s['socket']) ? fread($s['socket'], $d_size) : '';
}
$eof = $d ? false : true;
/* chunked despite HTTP 1.0 request */
if (isset($s['headers']) && isset($s['headers']['transfer-encoding']) && ('chunked' == $s['headers']['transfer-encoding'])) {
$d = preg_replace('/(^|[\r\n]+)[0-9a-f]{1,4}[\r\n]+/', '', $d);
}
$s['pos'] += strlen($d);
if ($buffer_xml) {/* stop after last closing xml tag (if available) */
if (preg_match('/^(.*\>)([^\>]*)$/s', $d, $m)) {
$d = $m[1];
$s['buffer'] = $m[2];
} elseif (!$eof) {
$s['buffer'] = $r.$d;
$this->stream = $s;
return $this->readStream(true, $d_size);
}
}
$this->stream = $s;
return $r.$d;
}
public function closeStream()
{
if (isset($this->stream)) {
if ('socket' == $this->v('type', 0, $this->stream) && !empty($this->stream['socket'])) {
@fclose($this->stream['socket']);
}
unset($this->stream);
}
}
public function getFormat()
{
if (!$this->format) {
if (!$this->v('stream')) {
return $this->addError('missing stream in "getFormat"');
}
$v = $this->readStream(false);
$mtype = $this->v('format', '', $this->stream['headers']);
$this->stream['buffer'] = $v.$this->stream['buffer'];
$ext = preg_match('/\.([^\.]+)$/', $this->uri, $m) ? $m[1] : '';
$this->format = ARC2::getFormat($v, $mtype, $ext);
}
return $this->format;
}
public function getResponseHeaders()
{
if (isset($this->stream) && isset($this->stream['headers'])) {
return $this->stream['headers'];
}
return $this->response_headers;
}
public function getEncoding($default = 'UTF-8')
{
return $this->v1('encoding', $default, $this->stream['headers']);
}
public function getRedirects()
{
return $this->redirects;
}
public function getAuthInfos()
{
return $this->auth_infos;
}
}