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clean up the salmon consumer bits

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This commit is contained in:
Mike Macgirvin 2010-10-21 15:32:09 -07:00
parent 81be82ddab
commit a8a88d2532
2 changed files with 65 additions and 36 deletions
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27
include/salmon.php
View file

@ -43,25 +43,24 @@ function get_salmon_key($uri,$keyhash) {
$a = get_app();
$h = $a->get_curl_headers();
if($debugging)
file_put_contents('salmon.out', "\n" . 'Fetch key via HTML header: ' . $h . "\n", FILE_APPEND);
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 $line) {
if($debugging)
file_put_contents('salmon.out', "\n" . $line . "\n", FILE_APPEND);
if((stristr($line,'link:')) && preg_match('/<([^>].*)>.*rel\=[\'\"]lrdd[\'\"]/',$line,$matches)) {
$link = $matches[1];
if($debugging)
file_put_contents('salmon.out', "\n" . 'Fetch key via Link from header: ' . $link . "\n", FILE_APPEND);
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);
@ -85,6 +84,7 @@ function get_salmon_key($uri,$keyhash) {
return '';
$arr = fetch_xrd_links($link);
}
if($arr) {
foreach($arr as $a) {
@ -93,6 +93,13 @@ function get_salmon_key($uri,$keyhash) {
}
}
}
else {
return '';
}
// We have found at least one key URL
// If it's inline, parse it - otherwise get the key
if(count($ret)) {
for($x = 0; $x < count($ret); $x ++) {
if(substr($ret[$x],0,5) === 'data:') {
@ -105,10 +112,18 @@ function get_salmon_key($uri,$keyhash) {
$ret[$x] = fetch_url($ret[$x]);
}
}
if($debugging)
file_put_contents('salmon.out', "\n" . 'Key located: ' . print_r($ret,true) . "\n", FILE_APPEND);
if(count($ret) == 1) {
// We only found one one key so we don't care if the hash matches.
// If it's the wrong key we'll find out soon enough because
// message verification will fail. This also covers some older
// software which don't supply a keyhash. As long as they only
// have one key we'll be right.
return $ret[0];
}
else {

36
mod/salmon.php
View file

@ -1,7 +1,7 @@
<?php
// TODO: pass keyhash to key discovery
// TODO:
// add relevant contacts so they can use this
// There is a lot of debug stuff in here because this is quite a
@ -68,24 +68,30 @@ function salmon_post(&$a) {
$signature = base64url_decode($base->sig);
if($debugging)
file_put_contents('salmon.out', "\n" . 'Encoded Signature: ' . $base->sig . "\n" , FILE_APPEND);
// unpack our data element.
// unpack the data
// strip whitespace
// strip whitespace so our data element will return to one big base64 blob
$data = str_replace(array(" ","\t","\r","\n"),array("","","",""),$base->data);
// stash away some other stuff for later
$type = $base->data[0]->attributes()->type[0];
$keyhash = $base->sig[0]->attributes()->keyhash[0];
$encoding = $base->encoding;
$alg = $base->alg;
$signed_data = $data;
// . '.' . base64url_encode($type) . '.' . base64url_encode($encoding) . '.' . base64url_encode($alg);
// decode it
$data = base64url_decode($data);
// If we're talking to status.net or one of their ilk, they aren't following the magic envelope spec
// and only signed the data element. We'll be nice and let them validate anyway.
if($debugging)
file_put_contents('salmon.out', "\n" . 'Signed data:>>>' . $signed_data . "<<<\n" , FILE_APPEND);
$stnet_signed_data = $data;
$signed_data = $data . '.' . base64url_encode($type) . '.' . base64url_encode($encoding) . '.' . base64url_encode($alg);
// decode the data
$data = base64url_decode($data);
// Remove the xml declaration
$data = preg_replace('/\<\?xml[^\?].*\?\>/','',$data);
@ -128,7 +134,7 @@ function salmon_post(&$a) {
salmon_return(500);
}
// Once we have the author URI, go to the web and find their public key
// Once we have the author URI, go to the web and try to find their public key
if($debugging) {
file_put_contents('salmon.out', "\n" . 'Fetching key for ' . $author_link . "\n", FILE_APPEND);
@ -152,6 +158,7 @@ function salmon_post(&$a) {
$m = base64url_decode($key_info[1]);
$e = base64url_decode($key_info[2]);
if($debugging)
file_put_contents('salmon.out',"\n" . print_r($key_info,true) . "\n", FILE_APPEND);
@ -164,9 +171,14 @@ function salmon_post(&$a) {
$rsa->exponent = new Math_BigInteger($e, 256);
// We should have everything we need now. Let's see if it verifies.
// If it fails with the proper data format, try again using just the data
// (e.g. status.net)
$verify = $rsa->verify($signed_data,$signature);
if(! $verify)
$verify = $rsa->verify($stnet_signed_data,$signature);
if(! $verify) {
if($debugging)
file_put_contents('salmon.out',"\n" . 'Message did not verify. Discarding.' . "\n", FILE_APPEND);
@ -193,9 +205,11 @@ function salmon_post(&$a) {
salmon_return(500);
}
require_once('include/items.php');
// Placeholder for hub discovery. We shouldn't find any hubs
// since we supplied the fake feed header - and it doesn't have any.
$hub = '';
consume_feed($feedxml,$importer,$r[0],$hub);