dir/include/network.php

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<?php
// curl wrapper. If binary flag is true, return binary
// results.
if(! function_exists('fetch_url')) {
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function fetch_url($url,$binary = false, &$redirects = 0, $timeout = 0) {
$a = get_app();
$ch = curl_init($url);
if(($redirects > 8) || (! $ch))
return false;
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,true);
curl_setopt($ch, CURLOPT_USERAGENT, "Friendika");
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if(intval($timeout)) {
curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
}
else {
$curl_time = intval(get_config('system','curl_timeout'));
curl_setopt($ch, CURLOPT_TIMEOUT, (($curl_time !== false) ? $curl_time : 60));
}
// by default we will allow self-signed certs
// but you can override this
$check_cert = get_config('system','verifyssl');
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, (($check_cert) ? true : false));
$prx = get_config('system','proxy');
if(strlen($prx)) {
curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, 1);
curl_setopt($ch, CURLOPT_PROXY, $prx);
$prxusr = get_config('system','proxyuser');
if(strlen($prxusr))
curl_setopt($ch, CURLOPT_PROXYUSERPWD, $prxusr);
}
if($binary)
curl_setopt($ch, CURLOPT_BINARYTRANSFER,1);
$a->set_curl_code(0);
// don't let curl abort the entire application
// if it throws any errors.
$s = @curl_exec($ch);
$base = $s;
$curl_info = curl_getinfo($ch);
$http_code = $curl_info['http_code'];
$header = '';
// Pull out multiple headers, e.g. proxy and continuation headers
// allow for HTTP/2.x without fixing code
while(preg_match('/^HTTP\/[1-2].+? [1-5][0-9][0-9]/',$base)) {
$chunk = substr($base,0,strpos($base,"\r\n\r\n")+4);
$header .= $chunk;
$base = substr($base,strlen($chunk));
}
if($http_code == 301 || $http_code == 302 || $http_code == 303 || $http_code == 307) {
$matches = array();
preg_match('/(Location:|URI:)(.*?)\n/', $header, $matches);
$url = trim(array_pop($matches));
$url_parsed = @parse_url($url);
if (isset($url_parsed)) {
$redirects++;
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return fetch_url($url,$binary,$redirects,$timeout);
}
}
$a->set_curl_code($http_code);
$body = substr($s,strlen($header));
$a->set_curl_headers($header);
curl_close($ch);
return($body);
}}
// post request to $url. $params is an array of post variables.
if(! function_exists('post_url')) {
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function post_url($url,$params, $headers = null, &$redirects = 0, $timeout = 0) {
$a = get_app();
$ch = curl_init($url);
if(($redirects > 8) || (! $ch))
return false;
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,true);
curl_setopt($ch, CURLOPT_POST,1);
curl_setopt($ch, CURLOPT_POSTFIELDS,$params);
curl_setopt($ch, CURLOPT_USERAGENT, "Friendika");
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if(intval($timeout)) {
curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
}
else {
$curl_time = intval(get_config('system','curl_timeout'));
curl_setopt($ch, CURLOPT_TIMEOUT, (($curl_time !== false) ? $curl_time : 60));
}
if(defined('LIGHTTPD')) {
if(!is_array($headers)) {
$headers = array('Expect:');
} else {
if(!in_array('Expect:', $headers)) {
array_push($headers, 'Expect:');
}
}
}
if($headers)
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
$check_cert = get_config('system','verifyssl');
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, (($check_cert) ? true : false));
$prx = get_config('system','proxy');
if(strlen($prx)) {
curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, 1);
curl_setopt($ch, CURLOPT_PROXY, $prx);
$prxusr = get_config('system','proxyuser');
if(strlen($prxusr))
curl_setopt($ch, CURLOPT_PROXYUSERPWD, $prxusr);
}
$a->set_curl_code(0);
// don't let curl abort the entire application
// if it throws any errors.
$s = @curl_exec($ch);
$base = $s;
$curl_info = curl_getinfo($ch);
$http_code = $curl_info['http_code'];
$header = '';
// Pull out multiple headers, e.g. proxy and continuation headers
// allow for HTTP/2.x without fixing code
while(preg_match('/^HTTP\/[1-2].+? [1-5][0-9][0-9]/',$base)) {
$chunk = substr($base,0,strpos($base,"\r\n\r\n")+4);
$header .= $chunk;
$base = substr($base,strlen($chunk));
}
if($http_code == 301 || $http_code == 302 || $http_code == 303) {
$matches = array();
preg_match('/(Location:|URI:)(.*?)\n/', $header, $matches);
$url = trim(array_pop($matches));
$url_parsed = @parse_url($url);
if (isset($url_parsed)) {
$redirects++;
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return post_url($url,$params,$headers,$redirects,$timeout);
}
}
$a->set_curl_code($http_code);
$body = substr($s,strlen($header));
$a->set_curl_headers($header);
curl_close($ch);
return($body);
}}
// Generic XML return
// Outputs a basic dfrn XML status structure to STDOUT, with a <status> variable
// of $st and an optional text <message> of $message and terminates the current process.
if(! function_exists('xml_status')) {
function xml_status($st, $message = '') {
$xml_message = ((strlen($message)) ? "\t<message>" . xmlify($message) . "</message>\r\n" : '');
if($st)
logger('xml_status returning non_zero: ' . $st . " message=" . $message);
header( "Content-type: text/xml" );
echo '<?xml version="1.0" encoding="UTF-8"?>'."\r\n";
echo "<result>\r\n\t<status>$st</status>\r\n$xml_message</result>\r\n";
killme();
}}
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if(! function_exists('http_status_exit')) {
function http_status_exit($val) {
if($val >= 400)
$err = 'Error';
if($val >= 200 && $val < 300)
$err = 'OK';
logger('http_status_exit ' . $val);
header($_SERVER["SERVER_PROTOCOL"] . ' ' . $val . ' ' . $err);
killme();
}}
// convert an XML document to a normalised, case-corrected array
// used by webfinger
if(! function_exists('convert_xml_element_to_array')) {
function convert_xml_element_to_array($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, or if no DFRN profile URL
// is located, returns an OStatus subscription template (prefixed
// with the string 'stat:' to identify it as on OStatus template).
// If this isn't an email style address just return $s.
// Return an empty string if email-style addresses but webfinger fails,
// or if the resultant personal XRD doesn't contain a supported
// subscription/friend-request attribute.
if(! function_exists('webfinger_dfrn')) {
function webfinger_dfrn($s) {
if(! strstr($s,'@')) {
return $s;
}
$links = webfinger($s);
logger('webfinger_dfrn: ' . $s . ':' . print_r($links,true), LOGGER_DATA);
if(count($links)) {
foreach($links as $link)
if($link['@attributes']['rel'] === NAMESPACE_DFRN)
return $link['@attributes']['href'];
foreach($links as $link)
if($link['@attributes']['rel'] === NAMESPACE_OSTATUSSUB)
return 'stat:' . $link['@attributes']['template'];
}
return '';
}}
// Given an email style address, perform webfinger lookup and
// return the array of link attributes from the personal XRD file.
// On error/failure return an empty array.
if(! function_exists('webfinger')) {
function webfinger($s) {
$host = '';
if(strstr($s,'@')) {
$host = substr($s,strpos($s,'@') + 1);
}
if(strlen($host)) {
$tpl = fetch_lrdd_template($host);
logger('webfinger: lrdd template: ' . $tpl);
if(strlen($tpl)) {
$pxrd = str_replace('{uri}', urlencode('acct:' . $s), $tpl);
logger('webfinger: pxrd: ' . $pxrd);
$links = fetch_xrd_links($pxrd);
if(! count($links)) {
// try with double slashes
$pxrd = str_replace('{uri}', urlencode('acct://' . $s), $tpl);
logger('webfinger: pxrd: ' . $pxrd);
$links = fetch_xrd_links($pxrd);
}
return $links;
}
}
return array();
}}
if(! function_exists('lrdd')) {
function lrdd($uri) {
$a = get_app();
// default priority is host priority, host-meta first
$priority = 'host';
// All we have is an email address. Resource-priority is irrelevant
// because our URI isn't directly resolvable.
if(strstr($uri,'@')) {
return(webfinger($uri));
}
// get the host meta file
$host = @parse_url($uri);
if($host) {
$url = ((x($host,'scheme')) ? $host['scheme'] : 'http') . '://';
$url .= $host['host'] . '/.well-known/host-meta' ;
}
else
return array();
logger('lrdd: constructed url: ' . $url);
$xml = fetch_url($url);
$headers = $a->get_curl_headers();
if (! $xml)
return array();
logger('lrdd: host_meta: ' . $xml, LOGGER_DATA);
$h = parse_xml_string($xml);
if(! $h)
return array();
$arr = convert_xml_element_to_array($h);
if(isset($arr['xrd']['property'])) {
$property = $arr['crd']['property'];
if(! isset($property[0]))
$properties = array($property);
else
$properties = $property;
foreach($properties as $prop)
if((string) $prop['@attributes'] === 'http://lrdd.net/priority/resource')
$priority = 'resource';
}
// save the links in case we need them
$links = array();
if(isset($arr['xrd']['link'])) {
$link = $arr['xrd']['link'];
if(! isset($link[0]))
$links = array($link);
else
$links = $link;
}
// do we have a template or href?
if(count($links)) {
foreach($links as $link) {
if($link['@attributes']['rel'] && attribute_contains($link['@attributes']['rel'],'lrdd')) {
if(x($link['@attributes'],'template'))
$tpl = $link['@attributes']['template'];
elseif(x($link['@attributes'],'href'))
$href = $link['@attributes']['href'];
}
}
}
if((! isset($tpl)) || (! strpos($tpl,'{uri}')))
$tpl = '';
if($priority === 'host') {
if(strlen($tpl))
$pxrd = str_replace('{uri}', urlencode($uri), $tpl);
elseif(isset($href))
$pxrd = $href;
if(isset($pxrd)) {
logger('lrdd: (host priority) pxrd: ' . $pxrd);
$links = fetch_xrd_links($pxrd);
return $links;
}
$lines = explode("\n",$headers);
if(count($lines)) {
foreach($lines as $line) {
if((stristr($line,'link:')) && preg_match('/<([^>].*)>.*rel\=[\'\"]lrdd[\'\"]/',$line,$matches)) {
return(fetch_xrd_links($matches[1]));
break;
}
}
}
}
// priority 'resource'
$html = fetch_url($uri);
$headers = $a->get_curl_headers();
logger('lrdd: headers=' . $headers, LOGGER_DEBUG);
// don't try and parse raw xml as html
if(! strstr($html,'<?xml')) {
require_once('library/HTML5/Parser.php');
$dom = @HTML5_Parser::parse($html);
if($dom) {
$items = $dom->getElementsByTagName('link');
foreach($items as $item) {
$x = $item->getAttribute('rel');
if($x == "lrdd") {
$pagelink = $item->getAttribute('href');
break;
}
}
}
}
if(isset($pagelink))
return(fetch_xrd_links($pagelink));
// next look in HTTP headers
$lines = explode("\n",$headers);
if(count($lines)) {
foreach($lines as $line) {
// TODO alter the following regex to support multiple relations (space separated)
if((stristr($line,'link:')) && preg_match('/<([^>].*)>.*rel\=[\'\"]lrdd[\'\"]/',$line,$matches)) {
$pagelink = $matches[1];
break;
}
// don't try and run feeds through the html5 parser
if(stristr($line,'content-type:') && ((stristr($line,'application/atom+xml')) || (stristr($line,'application/rss+xml'))))
return array();
if(stristr($html,'<rss') || stristr($html,'<feed'))
return array();
}
}
if(isset($pagelink))
return(fetch_xrd_links($pagelink));
// If we haven't found any links, return the host xrd links (which we have already fetched)
if(isset($links))
return $links;
return array();
}}
// Given a host name, locate the LRDD template from that
// host. Returns the LRDD template or an empty string on
// error/failure.
if(! function_exists('fetch_lrdd_template')) {
function fetch_lrdd_template($host) {
$tpl = '';
$url1 = 'https://' . $host . '/.well-known/host-meta' ;
$url2 = 'http://' . $host . '/.well-known/host-meta' ;
$links = fetch_xrd_links($url1);
logger('fetch_lrdd_template from: ' . $url1);
logger('template (https): ' . print_r($links,true));
if(! count($links)) {
logger('fetch_lrdd_template from: ' . $url2);
$links = fetch_xrd_links($url2);
logger('template (http): ' . print_r($links,true));
}
if(count($links)) {
foreach($links as $link)
if($link['@attributes']['rel'] && $link['@attributes']['rel'] === 'lrdd')
$tpl = $link['@attributes']['template'];
}
if(! strpos($tpl,'{uri}'))
$tpl = '';
return $tpl;
}}
// Given a URL, retrieve the page as an XRD document.
// Return an array of links.
// on error/failure return empty array.
if(! function_exists('fetch_xrd_links')) {
function fetch_xrd_links($url) {
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$xrd_timeout = intval(get_config('system','xrd_timeout'));
$redirects = 0;
$xml = fetch_url($url,false,$redirects,(($xrd_timeout) ? $xrd_timeout : 30));
logger('fetch_xrd_links: ' . $xml, LOGGER_DATA);
if ((! $xml) || (! stristr($xml,'<xrd')))
return array();
$h = parse_xml_string($xml);
if(! $h)
return array();
$arr = convert_xml_element_to_array($h);
$links = array();
if(isset($arr['xrd']['link'])) {
$link = $arr['xrd']['link'];
if(! isset($link[0]))
$links = array($link);
else
$links = $link;
}
if(isset($arr['xrd']['alias'])) {
$alias = $arr['xrd']['alias'];
if(! isset($alias[0]))
$aliases = array($alias);
else
$aliases = $alias;
foreach($aliases as $alias) {
$links[]['@attributes'] = array('rel' => 'alias' , 'href' => $alias);
}
}
logger('fetch_xrd_links: ' . print_r($links,true), LOGGER_DATA);
return $links;
}}
// Take a URL from the wild, prepend http:// if necessary
// and check DNS to see if it's real
// return true if it's OK, false if something is wrong with it
if(! function_exists('validate_url')) {
function validate_url(&$url) {
if(substr($url,0,4) != 'http')
$url = 'http://' . $url;
$h = @parse_url($url);
if(($h) && (dns_get_record($h['host'], DNS_A + DNS_CNAME + DNS_PTR))) {
return true;
}
return false;
}}
// checks that email is an actual resolvable internet address
if(! function_exists('validate_email')) {
function validate_email($addr) {
if(! strpos($addr,'@'))
return false;
$h = substr($addr,strpos($addr,'@') + 1);
if(($h) && (dns_get_record($h, DNS_A + DNS_CNAME + DNS_PTR + DNS_MX))) {
return true;
}
return false;
}}
// 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,$domain)) || ($pat == $domain)) {
$found = true;
break;
}
}
}
return $found;
}}
if(! function_exists('gravatar_img')) {
function gravatar_img($email) {
$size = 175;
$opt = 'identicon'; // psuedo-random geometric pattern if not found
$rating = 'pg';
$hash = md5(trim(strtolower($email)));
$url = 'http://www.gravatar.com/avatar/' . $hash . '.jpg'
. '?s=' . $size . '&d=' . $opt . '&r=' . $rating;
logger('gravatar: ' . $email . ' ' . $url);
return $url;
}}
if(! function_exists('parse_xml_string')) {
function parse_xml_string($s,$strict = true) {
if($strict) {
if(! strstr($s,'<?xml'))
return false;
$s2 = substr($s,strpos($s,'<?xml'));
}
else
$s2 = $s;
libxml_use_internal_errors(true);
$x = @simplexml_load_string($s2);
if(! $x) {
logger('libxml: parse: error: ' . $s2, LOGGER_DATA);
foreach(libxml_get_errors() as $err)
logger('libxml: parse: ' . $err->code." at ".$err->line.":".$err->column." : ".$err->message, LOGGER_DATA);
libxml_clear_errors();
}
return $x;
}}