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WebServer: Implement a very basic HTTP server :^)

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This server listens on port 8000 and serves HTML files from /www.
It's very simple and quite naive, but I think we can start here and
build our way to something pretty neat.

Work towards #792.
This commit is contained in:
Andreas Kling 2020-02-09 12:04:58 +01:00
parent 271bc4b2f2
commit 6c752c15a2
Notes: sideshowbarker 2024-07-19 09:30:56 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/6c752c15a2a
8 changed files with 198 additions and 1 deletions
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18
Base/www/index.html Normal file
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@ -0,0 +1,18 @@
<!DOCTYPE>
<html>
<head><title>WebServer start page!</title></head>
<body>
<h1>SerenityOS WebServer start page!</h1>
<p>
<b>Congratulations!</b>
</p>
<p>
If you are reading this in a browser, I think we may have
succeeded! Unless of course you just loaded the local file
in your browser (cheater!) :^)
</p>
<p>
Try this <a href="other.html">link</a> to another page!
</p>
</body>
</html>

16
Base/www/other.html Normal file
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@ -0,0 +1,16 @@
<!DOCTYPE>
<html>
<head><title>WebServer other page!</title></head>
<body>
<h1>SerenityOS WebServer other page!</h1>
<p>
<b>Holy moly!</b>
</p>
<p>
This is not even index.html, how neat is that! :^)
</p>
<p>
Maybe you want to go <a href="index.html">back to index.html</a>?
</p>
</body>
</html>

2
Kernel/build-root-filesystem.sh
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@ -148,6 +148,7 @@ cp ../Servers/AudioServer/AudioServer mnt/bin/AudioServer
cp ../Servers/TTYServer/TTYServer mnt/bin/TTYServer
cp ../Servers/TelnetServer/TelnetServer mnt/bin/TelnetServer
cp ../Servers/ProtocolServer/ProtocolServer mnt/bin/ProtocolServer
cp ../Servers/WebServer/WebServer mnt/bin/WebServer
cp ../Shell/Shell mnt/bin/Shell
cp ../MenuApplets/Audio/Audio.MenuApplet mnt/bin/
cp ../MenuApplets/CPUGraph/CPUGraph.MenuApplet mnt/bin/
@ -185,6 +186,7 @@ ln -s Browser mnt/bin/br
ln -s HackStudio mnt/bin/hs
ln -s SystemMonitor mnt/bin/sm
ln -s ProfileViewer mnt/bin/pv
ln -s WebServer mnt/bin/ws
echo "done"
mkdir -p mnt/boot/

2
Kernel/run
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@ -111,7 +111,7 @@ else
$SERENITY_COMMON_QEMU_ARGS \
$SERENITY_KVM_ARG \
$SERENITY_PACKET_LOGGING_ARG \
-netdev user,id=breh,hostfwd=tcp:127.0.0.1:8888-10.0.2.15:8888,hostfwd=tcp:127.0.0.1:8823-10.0.2.15:23 \
-netdev user,id=breh,hostfwd=tcp:127.0.0.1:8888-10.0.2.15:8888,hostfwd=tcp:127.0.0.1:8823-10.0.2.15:23,hostfwd=tcp:127.0.0.1:8000-10.0.2.15:8000 \
-device e1000,netdev=breh \
-kernel kernel \
-append "${SERENITY_KERNEL_CMDLINE}"

101
Servers/WebServer/Client.cpp Normal file
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#include "Client.h"
#include <AK/FileSystemPath.h>
#include <AK/StringBuilder.h>
#include <LibCore/File.h>
#include <LibCore/HttpRequest.h>
#include <stdio.h>
#include <time.h>
namespace WebServer {
Client::Client(NonnullRefPtr<Core::TCPSocket> socket, Core::Object* parent)
: Core::Object(parent)
, m_socket(socket)
{
}
void Client::die()
{
remove_from_parent();
}
void Client::start()
{
m_socket->on_ready_to_read = [this] {
auto raw_request = m_socket->read_all();
if (raw_request.is_null()) {
die();
return;
}
dbg() << "Got raw request: '" << String::copy(raw_request) << "'";
handle_request(move(raw_request));
die();
};
}
void Client::handle_request(ByteBuffer raw_request)
{
auto request_or_error = Core::HttpRequest::from_raw_request(raw_request);
if (!request_or_error.has_value())
return;
auto& request = request_or_error.value();
dbg() << "Got HTTP request: " << request.method_name() << " " << request.resource();
for (auto& header : request.headers()) {
dbg() << " " << header.name << " => " << header.value;
}
if (request.method() != Core::HttpRequest::Method::GET) {
send_error_response(403, "Forbidden, bro!", request);
return;
}
FileSystemPath canonical_path(request.resource());
dbg() << "Requested canonical path: '" << canonical_path.string() << "'";
StringBuilder path_builder;
path_builder.append("/www/");
path_builder.append(canonical_path.string());
if (Core::File::is_directory(path_builder.to_string()))
path_builder.append("/index.html");
auto file = Core::File::construct(path_builder.to_string());
if (!file->open(Core::File::ReadOnly)) {
send_error_response(404, "Not found, bro!", request);
return;
}
m_socket->write("HTTP/1.0 200 OK\r\n");
m_socket->write("Server: WebServer (SerenityOS)\r\n");
m_socket->write("Content-Type: text/html\r\n");
m_socket->write("\r\n");
m_socket->write(file->read_all());
log_response(200, request);
}
void Client::send_error_response(unsigned code, const StringView& message, const Core::HttpRequest& request)
{
StringBuilder builder;
builder.appendf("HTTP/1.0 %u", code);
builder.append(message);
builder.append("\r\n\r\n");
builder.append("<!DOCTYPE html><html><body><h1>");
builder.appendf("%u ", code);
builder.append(message);
builder.append("</h1></body></html>");
m_socket->write(builder.to_string());
log_response(code, request);
}
void Client::log_response(unsigned code, const Core::HttpRequest& request)
{
printf("%lld :: %03u :: %s %s\n", time(nullptr), code, request.method_name().characters(), request.resource().characters());
}
}

28
Servers/WebServer/Client.h Normal file
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@ -0,0 +1,28 @@
#pragma once
#include <LibCore/Object.h>
#include <LibCore/TCPSocket.h>
namespace Core {
class HttpRequest;
}
namespace WebServer {
class Client final : public Core::Object {
C_OBJECT(Client);
public:
void start();
private:
Client(NonnullRefPtr<Core::TCPSocket>, Core::Object* parent);
void handle_request(ByteBuffer);
void send_error_response(unsigned code, const StringView& message, const Core::HttpRequest&);
void die();
void log_response(unsigned code, const Core::HttpRequest&);
NonnullRefPtr<Core::TCPSocket> m_socket;
};
}

9
Servers/WebServer/Makefile Normal file
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@ -0,0 +1,9 @@
OBJS = \
Client.o \
main.o
PROGRAM = WebServer
LIB_DEPS = Core
include ../../Makefile.common

23
Servers/WebServer/main.cpp Normal file
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@ -0,0 +1,23 @@
#include "Client.h"
#include <LibCore/EventLoop.h>
#include <LibCore/TCPServer.h>
int main(int argc, char** argv)
{
(void)argc;
(void)argv;
Core::EventLoop loop;
auto server = Core::TCPServer::construct();
server->on_ready_to_accept = [&] {
auto client_socket = server->accept();
ASSERT(client_socket);
auto client = WebServer::Client::construct(client_socket.release_nonnull(), server);
client->start();
};
server->listen({}, 8000);
return loop.exec();
}