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9ff22ac7e0
ladybird/Userland/Libraries/LibHTTP/Job.cpp
Ali Mohammad Pur 9ff22ac7e0 LibHTTP: Skip the body when response code is 204 
...even if the headers claim that there's some data in the form of
Content-Length.
This finally fixes loading Discord with RequestServer ConnectionCache
on :^)
2022-02-09 21:23:25 +01:00

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27 KiB
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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Debug.h>
#include <AK/JsonArray.h>
#include <LibCompress/Gzip.h>
#include <LibCompress/Zlib.h>
#include <LibCore/Event.h>
#include <LibHTTP/HttpResponse.h>
#include <LibHTTP/Job.h>
#include <stdio.h>
#include <unistd.h>
namespace HTTP {
static Optional<ByteBuffer> handle_content_encoding(const ByteBuffer& buf, const String& content_encoding)
{
dbgln_if(JOB_DEBUG, "Job::handle_content_encoding: buf has content_encoding={}", content_encoding);
if (content_encoding == "gzip") {
if (!Compress::GzipDecompressor::is_likely_compressed(buf)) {
dbgln("Job::handle_content_encoding: buf is not gzip compressed!");
}
dbgln_if(JOB_DEBUG, "Job::handle_content_encoding: buf is gzip compressed!");
auto uncompressed = Compress::GzipDecompressor::decompress_all(buf);
if (!uncompressed.has_value()) {
dbgln("Job::handle_content_encoding: Gzip::decompress() failed.");
return {};
}
if constexpr (JOB_DEBUG) {
dbgln("Job::handle_content_encoding: Gzip::decompress() successful.");
dbgln(" Input size: {}", buf.size());
dbgln(" Output size: {}", uncompressed.value().size());
}
return uncompressed.release_value();
} else if (content_encoding == "deflate") {
dbgln_if(JOB_DEBUG, "Job::handle_content_encoding: buf is deflate compressed!");
// Even though the content encoding is "deflate", it's actually deflate with the zlib wrapper.
// https://tools.ietf.org/html/rfc7230#section-4.2.2
auto uncompressed = Compress::Zlib::decompress_all(buf);
if (!uncompressed.has_value()) {
// From the RFC:
// "Note: Some non-conformant implementations send the "deflate"
// compressed data without the zlib wrapper."
dbgln_if(JOB_DEBUG, "Job::handle_content_encoding: Zlib::decompress_all() failed. Trying DeflateDecompressor::decompress_all()");
uncompressed = Compress::DeflateDecompressor::decompress_all(buf);
if (!uncompressed.has_value()) {
dbgln("Job::handle_content_encoding: DeflateDecompressor::decompress_all() failed.");
return {};
}
}
if constexpr (JOB_DEBUG) {
dbgln("Job::handle_content_encoding: Deflate decompression successful.");
dbgln(" Input size: {}", buf.size());
dbgln(" Output size: {}", uncompressed.value().size());
}
return uncompressed.release_value();
}
return buf;
}
Job::Job(HttpRequest&& request, Core::Stream::Stream& output_stream)
: Core::NetworkJob(output_stream)
, m_request(move(request))
{
}
Job::~Job()
{
}
void Job::start(Core::Stream::Socket& socket)
{
VERIFY(!m_socket);
m_socket = static_cast<Core::Stream::BufferedSocketBase*>(&socket);
dbgln_if(HTTPJOB_DEBUG, "Reusing previous connection for {}", url());
deferred_invoke([this] {
dbgln_if(HTTPJOB_DEBUG, "HttpJob: on_connected callback");
on_socket_connected();
});
}
void Job::shutdown(ShutdownMode mode)
{
if (!m_socket)
return;
if (mode == ShutdownMode::CloseSocket) {
m_socket->close();
} else {
m_socket->on_ready_to_read = nullptr;
m_socket = nullptr;
}
}
void Job::flush_received_buffers()
{
if (!m_can_stream_response || m_buffered_size == 0)
return;
dbgln_if(JOB_DEBUG, "Job: Flushing received buffers: have {} bytes in {} buffers for {}", m_buffered_size, m_received_buffers.size(), m_request.url());
for (size_t i = 0; i < m_received_buffers.size(); ++i) {
auto& payload = m_received_buffers[i];
auto result = do_write(payload);
if (result.is_error()) {
if (!result.error().is_errno()) {
dbgln_if(JOB_DEBUG, "Job: Failed to flush received buffers: {}", result.error());
continue;
}
if (result.error().code() == EINTR) {
i--;
continue;
}
break;
}
auto written = result.release_value();
m_buffered_size -= written;
if (written == payload.size()) {
// FIXME: Make this a take-first-friendly object?
m_received_buffers.take_first();
--i;
continue;
}
VERIFY(written < payload.size());
payload = payload.slice(written, payload.size() - written);
break;
}
dbgln_if(JOB_DEBUG, "Job: Flushing received buffers done: have {} bytes in {} buffers for {}", m_buffered_size, m_received_buffers.size(), m_request.url());
}
void Job::register_on_ready_to_read(Function<void()> callback)
{
m_socket->on_ready_to_read = [this, callback = move(callback)] {
callback();
// As `m_socket` is a buffered object, we might not get notifications for data in the buffer
// so exhaust the buffer to ensure we don't end up waiting forever.
auto can_read_without_blocking = m_socket->can_read_without_blocking();
if (can_read_without_blocking.is_error())
return deferred_invoke([this] { did_fail(Core::NetworkJob::Error::TransmissionFailed); });
if (can_read_without_blocking.value() && m_state != State::Finished && !has_error()) {
deferred_invoke([this] {
if (m_socket && m_socket->on_ready_to_read)
m_socket->on_ready_to_read();
});
}
};
}
ErrorOr<String> Job::read_line(size_t size)
{
auto buffer = TRY(ByteBuffer::create_uninitialized(size));
auto nread = TRY(m_socket->read_until(buffer, "\r\n"sv));
return String::copy(buffer.span().slice(0, nread));
}
ErrorOr<ByteBuffer> Job::receive(size_t size)
{
if (size == 0)
return ByteBuffer {};
auto buffer = TRY(ByteBuffer::create_uninitialized(size));
size_t nread;
do {
auto result = m_socket->read(buffer);
if (result.is_error() && result.error().is_errno() && result.error().code() == EINTR)
continue;
nread = TRY(result);
break;
} while (true);
return buffer.slice(0, nread);
}
void Job::on_socket_connected()
{
auto raw_request = m_request.to_raw_request();
if constexpr (JOB_DEBUG) {
dbgln("Job: raw_request:");
dbgln("{}", String::copy(raw_request));
}
bool success = m_socket->write_or_error(raw_request);
if (!success)
deferred_invoke([this] { did_fail(Core::NetworkJob::Error::TransmissionFailed); });
register_on_ready_to_read([&] {
dbgln_if(JOB_DEBUG, "Ready to read for {}, state = {}, cancelled = {}", m_request.url(), to_underlying(m_state), is_cancelled());
if (is_cancelled())
return;
if (m_state == State::Finished) {
// We have everything we want, at this point, we can either get an EOF, or a bunch of extra newlines
// (unless "Connection: close" isn't specified)
// So just ignore everything after this.
return;
}
if (m_socket->is_eof()) {
dbgln_if(JOB_DEBUG, "Read failure: Actually EOF!");
return deferred_invoke([this] { did_fail(Core::NetworkJob::Error::ProtocolFailed); });
}
while (m_state == State::InStatus) {
auto can_read_line = m_socket->can_read_line();
if (can_read_line.is_error()) {
dbgln_if(JOB_DEBUG, "Job {} could not figure out whether we could read a line", m_request.url());
return deferred_invoke([this] { did_fail(Core::NetworkJob::Error::TransmissionFailed); });
}
if (!can_read_line.value()) {
dbgln_if(JOB_DEBUG, "Job {} cannot read line", m_request.url());
auto maybe_buf = receive(64);
if (maybe_buf.is_error()) {
dbgln_if(JOB_DEBUG, "Job {} cannot read any bytes!", m_request.url());
return deferred_invoke([this] { did_fail(Core::NetworkJob::Error::TransmissionFailed); });
}
dbgln_if(JOB_DEBUG, "{} bytes was read", maybe_buf.value().bytes().size());
return;
}
auto maybe_line = read_line(PAGE_SIZE);
if (maybe_line.is_error()) {
dbgln_if(JOB_DEBUG, "Job {} could not read line: {}", m_request.url(), maybe_line.error());
return deferred_invoke([this] { did_fail(Core::NetworkJob::Error::TransmissionFailed); });
}
auto line = maybe_line.release_value();
dbgln_if(JOB_DEBUG, "Job {} read line of length {}", m_request.url(), line.length());
if (line.is_null()) {
dbgln("Job: Expected HTTP status");
return deferred_invoke([this] { did_fail(Core::NetworkJob::Error::TransmissionFailed); });
}
auto parts = line.split_view(' ');
if (parts.size() < 3) {
dbgln("Job: Expected 3-part HTTP status, got '{}'", line);
return deferred_invoke([this] { did_fail(Core::NetworkJob::Error::ProtocolFailed); });
}
auto code = parts[1].to_uint();
if (!code.has_value()) {
dbgln("Job: Expected numeric HTTP status");
return deferred_invoke([this] { did_fail(Core::NetworkJob::Error::ProtocolFailed); });
}
m_code = code.value();
m_state = State::InHeaders;
auto can_read_without_blocking = m_socket->can_read_without_blocking();
if (can_read_without_blocking.is_error())
return deferred_invoke([this] { did_fail(Core::NetworkJob::Error::TransmissionFailed); });
if (!can_read_without_blocking.value())
return;
}
while (m_state == State::InHeaders || m_state == State::Trailers) {
auto can_read_line = m_socket->can_read_line();
if (can_read_line.is_error()) {
dbgln_if(JOB_DEBUG, "Job {} could not figure out whether we could read a line", m_request.url());
return deferred_invoke([this] { did_fail(Core::NetworkJob::Error::TransmissionFailed); });
}
if (!can_read_line.value()) {
dbgln_if(JOB_DEBUG, "Can't read lines anymore :(");
return;
}
// There's no max limit defined on headers, but for our sanity, let's limit it to 32K.
auto maybe_line = read_line(32 * KiB);
if (maybe_line.is_error()) {
dbgln_if(JOB_DEBUG, "Job {} could not read a header line: {}", m_request.url(), maybe_line.error());
return deferred_invoke([this] { did_fail(Core::NetworkJob::Error::TransmissionFailed); });
}
auto line = maybe_line.release_value();
if (line.is_null()) {
if (m_state == State::Trailers) {
// Some servers like to send two ending chunks
// use this fact as an excuse to ignore anything after the last chunk
// that is not a valid trailing header.
return finish_up();
}
dbgln("Job: Expected HTTP header");
return did_fail(Core::NetworkJob::Error::ProtocolFailed);
}
if (line.is_empty()) {
if (m_state == State::Trailers) {
return finish_up();
}
if (on_headers_received) {
if (!m_set_cookie_headers.is_empty())
m_headers.set("Set-Cookie", JsonArray { m_set_cookie_headers }.to_string());
on_headers_received(m_headers, m_code > 0 ? m_code : Optional<u32> {});
}
m_state = State::InBody;
// We've reached the end of the headers, there's a possibility that the server
// responds with nothing (content-length = 0 with normal encoding); if that's the case,
// quit early as we won't be reading anything anyway.
if (auto result = m_headers.get("Content-Length"sv).value_or(""sv).to_uint(); result.has_value()) {
if (result.value() == 0 && !m_headers.get("Transfer-Encoding"sv).value_or(""sv).view().trim_whitespace().equals_ignoring_case("chunked"sv))
return finish_up();
}
// There's also the possibility that the server responds with 204 (No Content),
// and manages to set a Content-Length anyway, in such cases ignore Content-Length and quit early;
// As the HTTP spec explicitly prohibits presence of Content-Length when the response code is 204.
if (m_code == 204)
return finish_up();
can_read_line = m_socket->can_read_line();
if (can_read_line.is_error())
return deferred_invoke([this] { did_fail(Core::NetworkJob::Error::TransmissionFailed); });
if (!can_read_line.value())
return;
break;
}
auto parts = line.split_view(':');
if (parts.is_empty()) {
if (m_state == State::Trailers) {
// Some servers like to send two ending chunks
// use this fact as an excuse to ignore anything after the last chunk
// that is not a valid trailing header.
return finish_up();
}
dbgln("Job: Expected HTTP header with key/value");
return deferred_invoke([this] { did_fail(Core::NetworkJob::Error::ProtocolFailed); });
}
auto name = parts[0];
if (line.length() < name.length() + 2) {
if (m_state == State::Trailers) {
// Some servers like to send two ending chunks
// use this fact as an excuse to ignore anything after the last chunk
// that is not a valid trailing header.
return finish_up();
}
dbgln("Job: Malformed HTTP header: '{}' ({})", line, line.length());
return deferred_invoke([this] { did_fail(Core::NetworkJob::Error::ProtocolFailed); });
}
auto value = line.substring(name.length() + 2, line.length() - name.length() - 2);
if (name.equals_ignoring_case("Set-Cookie")) {
dbgln_if(JOB_DEBUG, "Job: Received Set-Cookie header: '{}'", value);
m_set_cookie_headers.append(move(value));
auto can_read_without_blocking = m_socket->can_read_without_blocking();
if (can_read_without_blocking.is_error())
return deferred_invoke([this] { did_fail(Core::NetworkJob::Error::TransmissionFailed); });
if (!can_read_without_blocking.value())
return;
} else if (auto existing_value = m_headers.get(name); existing_value.has_value()) {
StringBuilder builder;
builder.append(existing_value.value());
builder.append(',');
builder.append(value);
m_headers.set(name, builder.build());
} else {
m_headers.set(name, value);
}
if (name.equals_ignoring_case("Content-Encoding")) {
// Assume that any content-encoding means that we can't decode it as a stream :(
dbgln_if(JOB_DEBUG, "Content-Encoding {} detected, cannot stream output :(", value);
m_can_stream_response = false;
} else if (name.equals_ignoring_case("Content-Length")) {
auto length = value.to_uint();
if (length.has_value())
m_content_length = length.value();
}
dbgln_if(JOB_DEBUG, "Job: [{}] = '{}'", name, value);
auto can_read_without_blocking = m_socket->can_read_without_blocking();
if (can_read_without_blocking.is_error())
return deferred_invoke([this] { did_fail(Core::NetworkJob::Error::TransmissionFailed); });
if (!can_read_without_blocking.value()) {
dbgln_if(JOB_DEBUG, "Can't read headers anymore, byebye :(");
return;
}
}
VERIFY(m_state == State::InBody);
auto can_read_without_blocking = m_socket->can_read_without_blocking();
if (can_read_without_blocking.is_error())
return deferred_invoke([this] { did_fail(Core::NetworkJob::Error::TransmissionFailed); });
if (!can_read_without_blocking.value())
return;
while (true) {
auto can_read_without_blocking = m_socket->can_read_without_blocking();
if (can_read_without_blocking.is_error())
return deferred_invoke([this] { did_fail(Core::NetworkJob::Error::TransmissionFailed); });
if (!can_read_without_blocking.value())
break;
auto read_size = 64 * KiB;
if (m_current_chunk_remaining_size.has_value()) {
read_chunk_size:;
auto remaining = m_current_chunk_remaining_size.value();
if (remaining == -1) {
// read size
auto maybe_size_data = read_line(PAGE_SIZE);
if (maybe_size_data.is_error()) {
dbgln_if(JOB_DEBUG, "Job: Could not receive chunk: {}", maybe_size_data.error());
}
auto size_data = maybe_size_data.release_value();
if (m_should_read_chunk_ending_line) {
VERIFY(size_data.is_empty());
m_should_read_chunk_ending_line = false;
continue;
}
auto size_lines = size_data.view().lines();
dbgln_if(JOB_DEBUG, "Job: Received a chunk with size '{}'", size_data);
if (size_lines.size() == 0) {
if (!m_socket->is_eof())
break;
dbgln("Job: Reached end of stream");
finish_up();
break;
} else {
auto chunk = size_lines[0].split_view(';', true);
String size_string = chunk[0];
char* endptr;
auto size = strtoul(size_string.characters(), &endptr, 16);
if (*endptr) {
// invalid number
deferred_invoke([this] { did_fail(Core::NetworkJob::Error::TransmissionFailed); });
break;
}
if (size == 0) {
// This is the last chunk
// '0' *[; chunk-ext-name = chunk-ext-value]
// We're going to ignore _all_ chunk extensions
read_size = 0;
m_current_chunk_total_size = 0;
m_current_chunk_remaining_size = 0;
dbgln_if(JOB_DEBUG, "Job: Received the last chunk with extensions '{}'", size_string.substring_view(1, size_string.length() - 1));
} else {
m_current_chunk_total_size = size;
m_current_chunk_remaining_size = size;
read_size = size;
dbgln_if(JOB_DEBUG, "Job: Chunk of size '{}' started", size);
}
}
} else {
read_size = remaining;
dbgln_if(JOB_DEBUG, "Job: Resuming chunk with '{}' bytes left over", remaining);
}
} else {
auto transfer_encoding = m_headers.get("Transfer-Encoding");
if (transfer_encoding.has_value()) {
// HTTP/1.1 3.3.3.3:
// If a message is received with both a Transfer-Encoding and a Content-Length header field, the Transfer-Encoding overrides the Content-Length. [...]
// https://httpwg.org/specs/rfc7230.html#message.body.length
m_content_length = {};
// Note: Some servers add extra spaces around 'chunked', see #6302.
auto encoding = transfer_encoding.value().trim_whitespace();
dbgln_if(JOB_DEBUG, "Job: This content has transfer encoding '{}'", encoding);
if (encoding.equals_ignoring_case("chunked")) {
m_current_chunk_remaining_size = -1;
goto read_chunk_size;
} else {
dbgln("Job: Unknown transfer encoding '{}', the result will likely be wrong!", encoding);
}
}
}
can_read_without_blocking = m_socket->can_read_without_blocking();
if (can_read_without_blocking.is_error())
return deferred_invoke([this] { did_fail(Core::NetworkJob::Error::TransmissionFailed); });
if (!can_read_without_blocking.value())
break;
dbgln_if(JOB_DEBUG, "Waiting for payload for {}", m_request.url());
auto maybe_payload = receive(read_size);
if (maybe_payload.is_error()) {
dbgln_if(JOB_DEBUG, "Could not read the payload: {}", maybe_payload.error());
return deferred_invoke([this] { did_fail(Core::NetworkJob::Error::TransmissionFailed); });
}
auto payload = maybe_payload.release_value();
if (payload.is_empty() && m_socket->is_eof()) {
finish_up();
break;
}
bool read_everything = false;
if (m_content_length.has_value()) {
auto length = m_content_length.value();
if (m_received_size + payload.size() >= length) {
payload.resize(length - m_received_size);
read_everything = true;
}
}
m_received_buffers.append(payload);
m_buffered_size += payload.size();
m_received_size += payload.size();
flush_received_buffers();
deferred_invoke([this] { did_progress(m_content_length, m_received_size); });
if (read_everything) {
VERIFY(m_received_size <= m_content_length.value());
finish_up();
break;
}
if (m_current_chunk_remaining_size.has_value()) {
auto size = m_current_chunk_remaining_size.value() - payload.size();
dbgln_if(JOB_DEBUG, "Job: We have {} bytes left over in this chunk", size);
if (size == 0) {
dbgln_if(JOB_DEBUG, "Job: Finished a chunk of {} bytes", m_current_chunk_total_size.value());
if (m_current_chunk_total_size.value() == 0) {
m_state = State::Trailers;
break;
}
// we've read everything, now let's get the next chunk
size = -1;
auto can_read_line = m_socket->can_read_line();
if (can_read_line.is_error())
return deferred_invoke([this] { did_fail(Core::NetworkJob::Error::TransmissionFailed); });
if (can_read_line.value()) {
auto maybe_line = read_line(PAGE_SIZE);
if (maybe_line.is_error()) {
return deferred_invoke([this] { did_fail(Core::NetworkJob::Error::TransmissionFailed); });
}
VERIFY(maybe_line.value().is_empty());
} else {
m_should_read_chunk_ending_line = true;
}
}
m_current_chunk_remaining_size = size;
}
}
if (!m_socket->is_open()) {
dbgln_if(JOB_DEBUG, "Connection appears to have closed, finishing up");
finish_up();
}
});
}
void Job::timer_event(Core::TimerEvent& event)
{
event.accept();
finish_up();
if (m_buffered_size == 0)
stop_timer();
}
void Job::finish_up()
{
VERIFY(!m_has_scheduled_finish);
m_state = State::Finished;
if (!m_can_stream_response) {
auto maybe_flattened_buffer = ByteBuffer::create_uninitialized(m_buffered_size);
if (maybe_flattened_buffer.is_error())
return did_fail(Core::NetworkJob::Error::TransmissionFailed);
auto flattened_buffer = maybe_flattened_buffer.release_value();
u8* flat_ptr = flattened_buffer.data();
for (auto& received_buffer : m_received_buffers) {
memcpy(flat_ptr, received_buffer.data(), received_buffer.size());
flat_ptr += received_buffer.size();
}
m_received_buffers.clear();
// For the time being, we cannot stream stuff with content-encoding set to _anything_.
// FIXME: LibCompress exposes a streaming interface, so this can be resolved
auto content_encoding = m_headers.get("Content-Encoding");
if (content_encoding.has_value()) {
if (auto result = handle_content_encoding(flattened_buffer, content_encoding.value()); result.has_value())
flattened_buffer = result.release_value();
else
return did_fail(Core::NetworkJob::Error::TransmissionFailed);
}
m_buffered_size = flattened_buffer.size();
m_received_buffers.append(move(flattened_buffer));
m_can_stream_response = true;
}
flush_received_buffers();
if (m_buffered_size != 0) {
// We have to wait for the client to consume all the downloaded data
// before we can actually call `did_finish`. in a normal flow, this should
// never be hit since the client is reading as we are writing, unless there
// are too many concurrent downloads going on.
dbgln_if(JOB_DEBUG, "Flush finished with {} bytes remaining, will try again later", m_buffered_size);
if (!has_timer())
start_timer(50);
return;
}
m_has_scheduled_finish = true;
auto response = HttpResponse::create(m_code, move(m_headers), m_received_size);
deferred_invoke([this, response = move(response)] {
// If the server responded with "Connection: close", close the connection
// as the server may or may not want to close the socket.
if (auto result = response->headers().get("Connection"sv); result.has_value() && result.value().equals_ignoring_case("close"sv))
shutdown(ShutdownMode::CloseSocket);
did_finish(response);
});
}
}
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