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better handling of XRDS files

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Our generated XRDS files contain 3 XRD elements: one for OAuth, one
for OMB, and one to point to the other two. Auth_Yadis only gives us
the last one, so we have to use it to find the other two, and then
extract service URLs from them.

Kind of fragile code, probably won't hold up under complicated
topologies, and won't work at all if the XRDs are in another XRDS
container. I tried to use XRDS filtering to get the top-priority
version of XRDs, services, and URIs, but Laconica's output doesn't use
any of that stuff and I don't particularly want to test it.

darcs-hash:20080602174249-84dde-b7ffdf7f21afb5b734def70530fc305689da471d.gz
This commit is contained in:
Evan Prodromou 2008-06-02 13:42:49 -04:00
parent 7743348d24
commit 03677f1a81
2 changed files with 104 additions and 36 deletions
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118
actions/remotesubscribe.php
View File

@ -121,53 +121,101 @@ class RemotesubscribeAction extends Action {
}
function getOmb($xrds) {
static $endpoints = array(OMB_ENDPOINT_UPDATEPROFILE, OMB_ENDPOINT_POSTNOTICE,
OAUTH_ENDPOINT_REQUEST, OAUTH_ENDPOINT_AUTHORIZE,
static $omb_endpoints = array(OMB_ENDPOINT_UPDATEPROFILE, OMB_ENDPOINT_POSTNOTICE);
static $oauth_endpoints = array(OAUTH_ENDPOINT_REQUEST, OAUTH_ENDPOINT_AUTHORIZE,
OAUTH_ENDPOINT_ACCESS);
$omb = array();
$services = $xrds->services(); # ordered by priority
if (!$services) {
common_debug('remotesubscribe.php: Got no services back from XRDS.');
# XXX: the following code could probably be refactored to eliminate dupes
$oauth_service = $xrds->services(array($this, 'matchOAuth'));
if (!$oauth_service) {
return NULL;
}
common_debug('remotesubscribe.php: XRDS service count: '.count($services));
$xrd = $this->getXRD($oauth_service, $xrds);
$this->addServices($xrd, $oauth_endpoints, $omb);
foreach ($services as $service) {
common_debug('remotesubscribe.php: XRDS service "'.print_r($service,TRUE).'"');
$types = $service->matchTypes($endpoints);
foreach ($types as $type) {
# We take the first one, since it's the highest priority
$omb_service = $xrds->services(array($this, 'matchOMB'));
if (!$omb_service) {
return NULL;
}
$xrd = $this->getXRD($omb_service, $xrds);
$this->addServices($xrd, $omb_endpoints, $omb);
# XXX: check that we got all the services we needed
foreach (array_merge($omb_endpoints, $oauth_endpoints) as $type) {
if (!array_key_exists($type, $omb)) {
# URIs is an array, priority-ordered
$omb[$type] = $service->getURIs();
# Special handling for request
if ($type == OAUTH_ENDPOINT_REQUEST) {
$nodes = $service->getElements('LocalID');
if (!$nodes) {
# error
return NULL;
}
$omb['listener'] = $service->parser->content($nodes[0]);
}
}
}
}
foreach ($endpoints as $ep) {
if (!array_key_exists($ep, $omb)) {
return NULL;
}
}
if (!array_key_exists('listener', $omb)) {
if (!omb_local_id($omb[OAUTH_ENDPOINT_REQUEST])) {
return NULL;
}
return $omb;
}
function getXRD($main_service, $main_xrds) {
$uri = omb_service_uri($main_service);
if (strpos($uri, "#") !== 0) {
# FIXME: more rigorous handling of external service definitions
return NULL;
}
$id = substr($uri, 1);
$nodes = $main_xrds->allXrdNodes;
$parser = $main_xrds->parser;
foreach ($nodes as $node) {
$attrs = $parser->attributes($node);
if (array_key_exists('xml:id', $attrs) &&
$attrs['xml:id'] == $id) {
return new Auth_Yadis_XRDS($parser, array($node));
}
}
return NULL;
}
function addServices($xrd, $types, &$omb) {
foreach ($types as $type) {
$filter = create_function('$s',
'return RemotesubscribeAction::matchService($s, \''.$type.'\'');
$matches = $xrd->services($filter);
if ($matches) {
$omb[$type] = $services[0];
} else {
# no match for type
return false;
}
}
return true;
}
function matchOAuth($service) {
return $this->matchService($service, OAUTH_DISCOVERY);
}
function matchOMB($service) {
return $this->matchService($service, OMB_VERSION_01);
}
function matchService($service, $type) {
if ($service && $service->matchTypes(array($type))) {
return TRUE;
} else {
return FALSE;
}
}
function request_token($omb) {
$con = omb_oauth_consumer();
$url = $omb[OAUTH_ENDPOINT_REQUEST][0];
$url = omb_service_uri($omb[OAUTH_ENDPOINT_REQUEST]);
# XXX: Is this the right thing to do? Strip off GET params and make them
# POST params? Seems wrong to me.
@ -178,7 +226,13 @@ class RemotesubscribeAction extends Action {
$req = OAuthRequest::from_consumer_and_token($con, NULL, "POST", $url, $params);
$req->set_parameter('omb_listener', $omb['listener']);
$listener = omb_local_id($omb[OAUTH_ENDPOINT_REQUEST]);
if (!$listener) {
return NULL;
}
$req->set_parameter('omb_listener', $listener);
$req->set_parameter('omb_version', OMB_VERSION_01);
# XXX: test to see if endpoint accepts this signature method
@ -206,7 +260,7 @@ class RemotesubscribeAction extends Action {
$con = omb_oauth_consumer();
$tok = new OAuthToken($token, $secret);
$url = $omb[OAUTH_ENDPOINT_AUTHORIZE][0];
$url = omb_service_uri($omb[OAUTH_ENDPOINT_AUTHORIZE]);
# XXX: Is this the right thing to do? Strip off GET params and make them
# POST params? Seems wrong to me.
@ -222,7 +276,7 @@ class RemotesubscribeAction extends Action {
# user decide if they really want to authorize the subscription.
$req->set_parameter('omb_version', OMB_VERSION_01);
$req->set_parameter('omb_listener', $omb['listener']);
$req->set_parameter('omb_listener', omb_local_id($omb[OAUTH_ENDPOINT_REQUEST]));
$req->set_parameter('omb_listenee', $user->uri);
$req->set_parameter('omb_listenee_profile', common_profile_url($user->nickname));
$req->set_parameter('omb_listenee_nickname', $user->nickname);

14
lib/omb.php
View File

@ -60,3 +60,17 @@ function omb_hmac_sha1() {
}
return $hmac_method;
}
function omb_service_uri($service) {
$uris = $service->getURIs();
if (!$uris) {
return NULL;
}
return $uris[0];
}
function omb_local_id($service) {
$els = $service->getElements('LocalID');
return ($els) ? $els[0] : NULL;
}