X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=include%2Fsalmon.php;h=b5c21a87b5641f8636fca2f24d5d6c6ad0aa9ad0;hb=82bd1ce3cb0097ad6be9650e4a1414e819cf8b0c;hp=52810426f69e3d8724eb90f9f2e0d5a5d590a296;hpb=a8a88d253296629d265242f03651419ed2982ec7;p=friendica.git

diff --git a/include/salmon.php b/include/salmon.php
index 52810426f6..b5c21a87b5 100644
--- a/include/salmon.php
+++ b/include/salmon.php
@@ -18,75 +18,45 @@ function salmon_key($pubkey) {
 }
 
 
-function base64url_encode($s) {
-	return strtr(base64_encode($s),'+/','-_');
+function base64url_encode($s, $strip_padding = false) {
+
+	$s = strtr(base64_encode($s),'+/','-_');
+
+	if($strip_padding)
+		$s = str_replace('=','',$s);
+
+	return $s;
 }
 
 function base64url_decode($s) {
+
+/*
+ *  // Placeholder for new rev of salmon which strips base64 padding.
+ *  // PHP base64_decode handles the un-padded input without requiring this step
+ *  // Uncomment if you find you need it.
+ *
+ *	$l = strlen($s);
+ *	if(! strpos($s,'=')) {
+ *		$m = $l % 4;
+ *		if($m == 2)
+ *			$s .= '==';
+ *		if($m == 3)
+ *			$s .= '=';
+ *	}
+ *
+ */
+
 	return base64_decode(strtr($s,'-_','+/'));
 }
 
 function get_salmon_key($uri,$keyhash) {
 	$ret = array();
 
-	$debugging = get_config('system','debugging');
-	if($debugging)		
-		file_put_contents('salmon.out', "\n" . 'Fetch key' . "\n", FILE_APPEND);
-
-	if(strstr($uri,'@')) {	
-		$arr = webfinger($uri);
-		if($debugging)
-			file_put_contents('salmon.out', "\n" . 'Fetch key from webfinger' . "\n", FILE_APPEND);
-	}
-	else {
-		$html = fetch_url($uri);
-		$a = get_app();
-		$h = $a->get_curl_headers();
-		if($debugging)
-			file_put_contents('salmon.out', "\n" . 'Fetch key via HTTP header: ' . $h . "\n", FILE_APPEND);
-
-		$l = explode("\n",$h);
-		if(count($l)) {
-			foreach($l as $line) {				
-				if((stristr($line,'link:')) && preg_match('/<([^>].*)>.*rel\=[\'\"]lrdd[\'\"]/',$line,$matches)) {
-					$link = $matches[1];
-					if($debugging)
-						file_put_contents('salmon.out', "\n" . 'Fetch key via HTML Link: ' . $link . "\n", FILE_APPEND);
-					break;
-				}
-			}
-		}
-
-		if(! isset($link)) {
-
-			// parse the page of the supplied URL looking for rel links
-
-			require_once('library/HTML5/Parser.php');
-			$dom = HTML5_Parser::parse($html);
+	logger('Fetching salmon key');
 
-			if(! $dom)
-				return '';
+	$arr = lrdd($uri);
 
-			$items = $dom->getElementsByTagName('link');
-
-			foreach($items as $item) {
-				$x = $item->getAttribute('rel');
-				if($x == "lrdd") {
-					$link = $item->getAttribute('href');
-					if($debugging)
-						file_put_contents('salmon.out', "\n" . 'Fetch key via HTML body' . $link . "\n", FILE_APPEND);
-					break;
-				}
-			}
-		}
-
-		if(! isset($link))
-			return '';
-
-		$arr = fetch_xrd_links($link);
-	}
-
-	if($arr) {
+	if(is_array($arr)) {
 		foreach($arr as $a) {
 			if($a['@attributes']['rel'] === 'magic-public-key') {
 				$ret[] = $a['@attributes']['href'];
@@ -113,8 +83,8 @@ function get_salmon_key($uri,$keyhash) {
 		}
 	}
 
-	if($debugging)
-		file_put_contents('salmon.out', "\n" . 'Key located: ' . print_r($ret,true) . "\n", FILE_APPEND);
+
+	logger('Key located: ' . print_r($ret,true));
 
 	if(count($ret) == 1) {
 
@@ -139,4 +109,105 @@ function get_salmon_key($uri,$keyhash) {
 
 	
 		
-				
\ No newline at end of file
+function slapper($owner,$url,$slap) {
+
+	logger('slapper called. Data: ' . $slap);
+
+	// does contact have a salmon endpoint? 
+
+	if(! strlen($url))
+		return;
+
+	// add all namespaces to item
+
+$namespaces = <<< EOT
+<entry xmlns="http://www.w3.org/2005/Atom"
+      xmlns:thr="http://purl.org/syndication/thread/1.0"
+      xmlns:at="http://purl.org/atompub/tombstones/1.0"
+      xmlns:media="http://purl.org/syndication/atommedia"
+      xmlns:dfrn="http://purl.org/macgirvin/dfrn/1.0" 
+      xmlns:as="http://activitystrea.ms/spec/1.0/"
+      xmlns:georss="http://www.georss.org/georss" 
+      xmlns:poco="http://portablecontacts.net/spec/1.0" 
+      xmlns:ostatus="http://ostatus.org/schema/1.0" >
+EOT;
+
+	$slap = str_replace('<entry>',$namespaces,$slap);
+	
+	// create a magic envelope
+
+	$data      = base64url_encode($slap);
+	$data_type = 'application/atom+xml';
+	$encoding  = 'base64url';
+	$algorithm = 'RSA-SHA256';
+	$keyhash   = base64url_encode(hash('sha256',salmon_key($owner['spubkey'])));
+
+	// Setup RSA stuff to PKCS#1 sign the data
+
+	set_include_path(get_include_path() . PATH_SEPARATOR . 'phpsec');
+
+	require_once('phpsec/Crypt/RSA.php');
+
+    $rsa = new CRYPT_RSA();
+    $rsa->signatureMode = CRYPT_RSA_SIGNATURE_PKCS1;
+    $rsa->setHash('sha256');
+	$rsa->loadKey($owner['sprvkey']);
+
+	// precomputed base64url encoding of data_type, encoding, algorithm concatenated with periods
+
+	$precomputed = '.YXBwbGljYXRpb24vYXRvbSt4bWw=.YmFzZTY0dXJs.UlNBLVNIQTI1Ng==';
+
+	$signature  = base64url_encode($rsa->sign($data . $precomputed));
+
+	$signature2  = base64url_encode($rsa->sign($data));
+
+	$salmon_tpl = load_view_file('view/magicsig.tpl');
+	$salmon = replace_macros($salmon_tpl,array(
+		'$data'      => $data,
+		'$encoding'  => $encoding,
+		'$algorithm' => $algorithm,
+		'$keyhash'   => $keyhash,
+		'$signature' => $signature
+	));
+
+	// slap them 
+	post_url($url,$salmon, array(
+		'Content-type: application/magic-envelope+xml',
+		'Content-length: ' . strlen($salmon)
+	));
+
+	$a = get_app();
+	$return_code = $a->get_curl_code();
+
+	// check for success, e.g. 2xx
+
+	if($return_code > 299) {
+
+		logger('slapper: compliant salmon failed. Falling back to status.net hack');
+
+		// Entirely likely that their salmon implementation is
+		// non-compliant. Let's try once more, this time only signing
+		// the data, without the precomputed blob 
+
+		$salmon = replace_macros($salmon_tpl,array(
+			'$data'      => $data,
+			'$encoding'  => $encoding,
+			'$algorithm' => $algorithm,
+			'$keyhash'   => $keyhash,
+			'$signature' => $signature2
+		));
+
+		// slap them 
+		post_url($url,$salmon, array(
+			'Content-type: application/magic-envelope+xml',
+			'Content-length: ' . strlen($salmon)
+		));
+		$return_code = $a->get_curl_code();
+
+	}
+	logger('slapper returned ' . $return_code); 
+	if(! $return_code)
+		return(-1);
+	return ((($return_code >= 200) && ($return_code < 300)) ? 0 : 1);
+}
+