2010-02-22 23:05:32 +09:00
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<?php
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/**
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* StatusNet - the distributed open-source microblogging tool
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* Copyright (C) 2010, StatusNet, Inc.
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*
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* A sample module to show best practices for StatusNet plugins
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*
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* PHP version 5
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @package StatusNet
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* @author James Walker <james@status.net>
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* @copyright 2010 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
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* @link http://status.net/
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*/
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class MagicEnvelope
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{
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const ENCODING = 'base64url';
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const NS = 'http://salmon-protocol.org/ns/magic-env';
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private function normalizeUser($user_id)
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{
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if (substr($user_id, 0, 5) == 'http:' ||
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substr($user_id, 0, 6) == 'https:' ||
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substr($user_id, 0, 5) == 'acct:') {
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return $user_id;
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}
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if (strpos($user_id, '@') !== FALSE) {
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return 'acct:' . $user_id;
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}
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return 'http://' . $user_id;
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}
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public function getKeyPair($signer_uri)
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{
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2010-02-26 13:38:25 +09:00
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$disco = new Discovery();
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2010-02-26 18:07:58 +09:00
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try {
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$xrd = $disco->lookup($signer_uri);
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} catch (Exception $e) {
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return false;
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}
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if ($xrd->links) {
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if ($link = Discovery::getService($xrd->links, Magicsig::PUBLICKEYREL)) {
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list($type, $keypair) = explode(';', $link['href']);
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return $keypair;
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}
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2010-02-26 13:38:25 +09:00
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}
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throw new Exception('Unable to locate signer public key');
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2010-02-22 23:05:32 +09:00
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}
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2010-02-27 04:21:21 +09:00
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public function signMessage($text, $mimetype, $keypair)
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2010-02-22 23:05:32 +09:00
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{
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2010-02-26 18:07:58 +09:00
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$signature_alg = Magicsig::fromString($keypair);
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2010-02-22 23:05:32 +09:00
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$armored_text = base64_encode($text);
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return array(
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'data' => $armored_text,
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'encoding' => MagicEnvelope::ENCODING,
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'data_type' => $mimetype,
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'sig' => $signature_alg->sign($armored_text),
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'alg' => $signature_alg->getName()
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);
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}
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public function unfold($env)
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{
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$dom = new DOMDocument();
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$dom->loadXML(base64_decode($env['data']));
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if ($dom->documentElement->tagName != 'entry') {
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return false;
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}
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$prov = $dom->createElementNS(MagicEnvelope::NS, 'me:provenance');
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$prov->setAttribute('xmlns:me', MagicEnvelope::NS);
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$data = $dom->createElementNS(MagicEnvelope::NS, 'me:data', $env['data']);
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$data->setAttribute('type', $env['data_type']);
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$prov->appendChild($data);
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$enc = $dom->createElementNS(MagicEnvelope::NS, 'me:encoding', $env['encoding']);
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$prov->appendChild($enc);
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$alg = $dom->createElementNS(MagicEnvelope::NS, 'me:alg', $env['alg']);
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$prov->appendChild($alg);
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$sig = $dom->createElementNS(MagicEnvelope::NS, 'me:sig', $env['sig']);
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$prov->appendChild($sig);
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$dom->documentElement->appendChild($prov);
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return $dom->saveXML();
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}
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public function getAuthor($text) {
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$doc = new DOMDocument();
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if (!$doc->loadXML($text)) {
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return FALSE;
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}
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if ($doc->documentElement->tagName == 'entry') {
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$authors = $doc->documentElement->getElementsByTagName('author');
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foreach ($authors as $author) {
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$uris = $author->getElementsByTagName('uri');
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foreach ($uris as $uri) {
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return $this->normalizeUser($uri->nodeValue);
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}
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}
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}
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}
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public function checkAuthor($text, $signer_uri)
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{
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return ($this->getAuthor($text) == $signer_uri);
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}
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public function verify($env)
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{
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if ($env['alg'] != 'RSA-SHA256') {
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return false;
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}
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if ($env['encoding'] != MagicEnvelope::ENCODING) {
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return false;
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}
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$text = base64_decode($env['data']);
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$signer_uri = $this->getAuthor($text);
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2010-02-23 13:30:21 +09:00
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$verifier = Magicsig::fromString($this->getKeyPair($signer_uri));
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2010-02-22 23:05:32 +09:00
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return $verifier->verify($env['data'], $env['sig']);
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}
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public function parse($text)
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{
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$dom = DOMDocument::loadXML($text);
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return $this->fromDom($dom);
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}
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public function fromDom($dom)
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{
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if ($dom->documentElement->tagName == 'entry') {
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$env_element = $dom->getElementsByTagNameNS(MagicEnvelope::NS, 'provenance')->item(0);
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} else if ($dom->documentElement->tagName == 'me:env') {
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$env_element = $dom->documentElement;
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} else {
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return false;
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}
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$data_element = $env_element->getElementsByTagNameNS(MagicEnvelope::NS, 'data')->item(0);
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return array(
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'data' => trim($data_element->nodeValue),
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'data_type' => $data_element->getAttribute('type'),
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'encoding' => $env_element->getElementsByTagNameNS(MagicEnvelope::NS, 'encoding')->item(0)->nodeValue,
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'alg' => $env_element->getElementsByTagNameNS(MagicEnvelope::NS, 'alg')->item(0)->nodeValue,
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'sig' => $env_element->getElementsByTagNameNS(MagicEnvelope::NS, 'sig')->item(0)->nodeValue,
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);
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}
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}
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