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-rw-r--r--include/network.php669
1 files changed, 669 insertions, 0 deletions
diff --git a/include/network.php b/include/network.php
new file mode 100644
index 000000000..48e830e84
--- /dev/null
+++ b/include/network.php
@@ -0,0 +1,669 @@
+<?php
+
+
+// curl wrapper. If binary flag is true, return binary
+// results.
+
+if(! function_exists('fetch_url')) {
+function fetch_url($url,$binary = false, &$redirects = 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");
+
+ $curl_time = intval(get_config('system','curl_timeout'));
+ curl_setopt($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)) {
+ $redirects++;
+ return fetch_url($url,$binary,$redirects);
+ }
+ }
+
+ $a->set_curl_code($http_code);
+
+ $body = substr($s,strlen($header));
+
+ $a->set_curl_headers($header);
+
+ curl_close($ch);
+ return($body);
+}}
+
+// post request to $url. $params is an array of post variables.
+
+if(! function_exists('post_url')) {
+function post_url($url,$params, $headers = null, &$redirects = 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");
+
+ $curl_time = intval(get_config('system','curl_timeout'));
+ curl_setopt($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)) {
+ $redirects++;
+ return post_url($url,$binary,$headers,$redirects);
+ }
+ }
+ $a->set_curl_code($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$xml_message</result>\r\n";
+ killme();
+}}
+
+
+
+// convert an XML document to a normalised, case-corrected array
+// used by webfinger
+
+if(! function_exists('convert_xml_element_to_array')) {
+function convert_xml_element_to_array($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) {
+
+
+ $xml = fetch_url($url);
+
+ 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;
+}}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-03 11:51:58 +0000