Merge remote-tracking branch 'friendika/master' into newui

1 files changed, 695 insertions, 0 deletions

diff --git a/include/network.php b/include/network.php
new file mode 100644
index 000000000..bbf1d6a63
--- /dev/null
+++ b/include/network.php
@@ -0,0 +1,695 @@
+<?php
+
+
+// curl wrapper. If binary flag is true, return binary
+// results. 
+
+if(! function_exists('fetch_url')) {
+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");
+
+	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)) {
+            $redirects++;
+            return fetch_url($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. $params is an array of post variables.
+
+if(! function_exists('post_url')) {
+function post_url($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($ch, CURLOPT_USERAGENT, "Friendika");
+
+	if(intval($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)) {
+            $redirects++;
+            return post_url($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$xml_message</result>\r\n";
+	killme();
+}}
+
+
+if(! function_exists('http_status_exit')) {
+function http_status_exit($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) {
+
+	$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 = $alias;
+		if(count($aliases)) {
+			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;
+}}