public function handle(Command $command, ClientContext $context) : Generator
{
yield from $context->writeResponse(new Response(101, 'Capability list follows (multi-line)'));
// Generate the list of capabilities that we support.
$capabilities = ['VERSION 2', 'READER', 'POST', 'NEWNEWS', 'LIST ACTIVE', 'IMPLEMENTATION coderstephen/nntp server'];
// If TLS is not already active, the STARTTLS is available.
if (!$context->getSocket()->isCryptoEnabled()) {
//array_splice($capabilities, -2, 0, ['STARTTLS']);
}
$data = implode("\r\n", $capabilities);
yield from $context->writeData($data);
}
public function handle(Command $command, ClientContext $context) : Generator
{
yield from $context->writeResponse(new Response(215, 'List of newsgroups follows'));
$groups = (yield from $context->getAccessLayer()->getGroups());
$data = array_reduce($groups, function (string $s, Group $group) {
switch ($group->status()) {
case Group::POSTING_PERMITTED:
$status = 'y';
break;
case Group::POSTING_NOT_PERMITTED:
$status = 'n';
break;
case Group::POSTING_FORWARDED:
$status = 'm';
break;
default:
$status = 'u';
break;
}
return $s . sprintf("%s %d %d %s\r\n", $group->name(), $group->highWaterMark(), $group->lowWaterMark(), $status);
}, '');
yield from $context->writeData($data);
}
public function handle(Command $command, ClientContext $context) : Generator
{
if (!$context->getAccessLayer()->isPostingAllowed()) {
yield from $context->writeResponse(new Response(440, 'Posting not permitted'));
return;
}
yield from $context->writeResponse(new Response(340, 'Send article to be posted'));
$data = (yield from $context->readData());
$article = Article::parse($data);
try {
yield from $context->getAccessLayer()->postArticle($article);
yield from $context->writeResponse(new Response(240, 'Article received OK'));
} catch (\Throwable $e) {
yield from $context->writeResponse(new Response(441, 'Posting failed'));
}
}
public function handle(Command $command, ClientContext $context) : Generator
{
// Make sure we have a valid cursor.
if (!$context->getCursor()->valid()) {
yield from $context->writeResponse(new Response(412, 'No newsgroup selected'));
return;
}
// Try to move to the next article.
if (!(yield from $context->getCursor()->next())) {
yield from $context->writeResponse(new Response(421, 'No next article in this group'));
return;
}
// Spit out the current article info.
$article = $context->getCursor()->getArticle();
yield from $context->writeResponse(new Response(223, '%d %s Article found', $article->number(), $article->id()));
}
public function handle(Command $command, ClientContext $context) : Generator
{
if ($command->argCount() !== 1) {
yield from $context->writeResponse(new Response(501, 'Invalid number of arguments'));
return;
}
try {
$name = $command->arg(0);
$cursor = (yield from $context->getAccessLayer()->getGroupCursor($name));
$context->setCursor($cursor);
} catch (NotFoundException $e) {
yield from $context->writeResponse(new Response(411, 'No such newsgroup'));
return;
}
$group = $context->getCursor()->getGroup();
yield from $context->writeResponse(new Response(211, $group->count() . ' ' . $group->lowWaterMark() . ' ' . $group->highWaterMark() . ' ' . $group->name() . ' Group successfully selected'));
}
public function handle(Command $command, ClientContext $context) : Generator
{
if ($command->argCount() === 0) {
$group = $this->currentGroup;
}
$name = $command->arg(0);
$group = (yield from $context->getAccessLayer()->getGroupByName($name));
if (!$group) {
yield from $context->writeResponse(new Response(411, 'No such newsgroup'));
return;
}
$context->setCurrentGroup($group->name());
$context->setCurrentArticle($group->lowWaterMark());
yield from $context->writeResponse(new Response(211, $group->count() . ' ' . $group->lowWaterMark() . ' ' . $group->highWaterMark() . ' ' . $group->name() . ' Group successfully selected'));
}
public function handle(Command $command, ClientContext $context) : Generator
{
yield from $context->writeResponse(new Response(200, 'Reader mode already active'));
}
public function handle(Command $command, ClientContext $context) : Generator
{
yield from $context->writeResponse(new Response(100, 'Help text follows (multi-line)'));
$data = implode("\r\n", ['article [message-id|number]', 'body [message-id|number]', 'capabilities', 'date', 'group group', 'head [message-id|number]', 'help', 'last', 'list active', 'listgroup', 'newgroups', 'newnews', 'next', 'post', 'quit', 'stat']);
yield from $context->writeData($data);
}
protected function fetchArticle(Command $command, ClientContext $context) : Generator
{
// Current article?
if ($command->argCount() === 0) {
if (!$context->getCursor()->valid()) {
yield from $context->writeResponse(new Response(412, 'No newsgroup selected'));
return;
}
return $context->getCursor()->getArticle();
} elseif (is_numeric($command->arg(0))) {
$number = (int) $command->arg(0);
if (!$context->getCursor()->valid()) {
yield from $context->writeResponse(new Response(412, 'No newsgroup selected'));
return;
}
if (!(yield from $context->getCursor()->seek($number))) {
yield from $context->writeResponse(new Response(423, 'No article with that number'));
return;
}
return $context->getCursor()->getArticle();
} else {
$article = (yield from $context->getAccessLayer()->getArticleById($command->arg(0)));
if (!$article) {
yield from $context->writeResponse(new Response(430, 'No article with that message-id'));
return;
}
}
return $article;
}
/**
* Services requests for a connected client.
*
* Manages the server-side state for the remote client and interprets client commands.
*/
private function handleClient(Socket $socket) : Generator
{
yield from log()->log(Log::INFO, 'Accepted client from %s:%d on %s:%d', $socket->getRemoteAddress(), $socket->getRemotePort(), $socket->getLocalAddress(), $socket->getLocalPort());
// Create a new context object for this client.
$context = new ClientContext($socket, $this->encoder, $this->accessLayer);
try {
// Send a welcome message.
$welcome = new Response(200, 'Ready');
yield from $context->writeResponse($welcome);
// Command loop
while ($socket->isOpen()) {
// Parse incoming commands.
$command = (yield from $context->readCommand());
// Determine the command name and choose how to handle it.
$handler = null;
switch ($command->name()) {
// Mandatory commands
case 'CAPABILITIES':
$handler = $this->getHandler(handlers\CapabilitiesHandler::class);
break;
case 'HEAD':
$handler = $this->getHandler(handlers\HeadHandler::class);
break;
case 'HELP':
$handler = $this->getHandler(handlers\HelpHandler::class);
break;
// We don't advertise MODE support, but some readers need it
// We don't advertise MODE support, but some readers need it
case 'MODE':
$handler = $this->getHandler(handlers\ModeHandler::class);
break;
case 'STAT':
$handler = $this->getHandler(handlers\StatHandler::class);
break;
case 'QUIT':
yield from $context->writeResponse(new Response(205, 'Closing connection'));
break 2;
// stop command loop
// LIST commands
// stop command loop
// LIST commands
case 'LIST':
$handler = $this->getHandler(handlers\ListHandler::class);
break;
// NEWNEWS commands
// NEWNEWS commands
case 'NEWNEWS':
$handler = $this->getHandler(handlers\NewNewsHandler::class);
break;
// POST commands
// POST commands
case 'POST':
$handler = $this->getHandler(handlers\PostHandler::class);
break;
// READER commands
// READER commands
case 'ARTICLE':
$handler = $this->getHandler(handlers\ArticleHandler::class);
break;
case 'BODY':
$handler = $this->getHandler(handlers\BodyHandler::class);
break;
case 'DATE':
$handler = $this->getHandler(handlers\DateHandler::class);
break;
case 'GROUP':
$handler = $this->getHandler(handlers\GroupHandler::class);
break;
case 'LAST':
$handler = $this->getHandler(handlers\LastHandler::class);
break;
case 'LISTGROUP':
$handler = $this->getHandler(handlers\ListGroupHandler::class);
break;
case 'NEWGROUPS':
$handler = $this->getHandler(handlers\NewGroupsHandler::class);
break;
case 'NEXT':
$handler = $this->getHandler(handlers\NextHandler::class);
break;
}
// Unknown command
if (!$handler) {
yield from $context->writeResponse(new Response(500, 'Unknown command'));
} else {
// Execute the selected command handler.
try {
yield from $handler->handle($command, $context);
} catch (\Throwable $e) {
yield from log()->log(Log::ERROR, 'Error handling command: ' . $e);
yield from $context->writeResponse(new Response(502, 'Server error'));
}
}
}
} catch (UnreadableException $e) {
// Client disconnected.
} catch (UnwritableException $e) {
// Client disconnected.
} catch (ClosedException $e) {
// Client disconnected.
}
yield from log()->log(Log::INFO, 'Disconnected client from %s:%d on %s:%d', $socket->getRemoteAddress(), $socket->getRemotePort(), $socket->getLocalAddress(), $socket->getLocalPort());
// Close the connection to the client.
if ($socket->isOpen()) {
$socket->close();
}
}
public function handle(Command $command, ClientContext $context) : Generator
{
yield from $context->writeResponse(new Response(111, date('YmdHis')));
}
public function handle(Command $command, ClientContext $context) : Generator
{
yield from $context->writeResponse(new Response(382, 'Continue with TLS negotiation'));
yield from $context->getSocket()->enableCrypto(self::CRYPTO_METHOD);
}
