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LibWeb+LibWebSocket: DOM WebSocket subprotocol support

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This adds support for WebSocket subprotocols to WebSocket DOM
objects, with some necessary plumbing to LibWebSocket and its
clients.

See the associated pull request for how this was tested.
This commit is contained in:
Guilherme Gonçalves 2022-12-31 10:37:10 +00:00 • committed by Andreas Kling
parent 9115e99e4b
commit 230c0b34d4
19 changed files with 107 additions and 34 deletions
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32
Userland/Libraries/LibWebSocket/WebSocket.cpp
View file

@ -74,6 +74,11 @@ ReadyState WebSocket::ready_state()
}
}
DeprecatedString WebSocket::subprotocol_in_use()
{
return m_subprotocol_in_use;
}
void WebSocket::send(Message const& message)
{
// Calling send on a socket that is not opened is not allowed
@ -356,22 +361,21 @@ void WebSocket::read_server_handshake()
}
if (header_name.equals_ignoring_case("Sec-WebSocket-Protocol"sv)) {
// 6. |Sec-WebSocket-Protocol| should not contain an extension that doesn't appear in m_connection->protocols()
auto server_protocols = parts[1].split(',');
for (auto const& protocol : server_protocols) {
auto trimmed_protocol = protocol.trim_whitespace();
bool found_protocol = false;
for (auto const& supported_protocol : m_connection.protocols()) {
if (trimmed_protocol.equals_ignoring_case(supported_protocol)) {
found_protocol = true;
}
}
if (!found_protocol) {
dbgln("WebSocket: Server HTTP Handshake Header |Sec-WebSocket-Protocol| contains '{}', which is not supported by the client. Failing connection.", trimmed_protocol);
fatal_error(WebSocket::Error::ConnectionUpgradeFailed);
return;
// 6. If the response includes a |Sec-WebSocket-Protocol| header field and this header field indicates the use of a subprotocol that was not present in the client's handshake (the server has indicated a subprotocol not requested by the client), the client MUST _Fail the WebSocket Connection_.
// Additionally, Section 4.2.2 says this is "Either a single value representing the subprotocol the server is ready to use or null."
auto server_protocol = parts[1].trim_whitespace();
bool found_protocol = false;
for (auto const& supported_protocol : m_connection.protocols()) {
if (server_protocol.equals_ignoring_case(supported_protocol)) {
found_protocol = true;
}
}
if (!found_protocol) {
dbgln("WebSocket: Server HTTP Handshake Header |Sec-WebSocket-Protocol| contains '{}', which is not supported by the client. Failing connection.", server_protocol);
fatal_error(WebSocket::Error::ConnectionUpgradeFailed);
return;
}
m_subprotocol_in_use = server_protocol;
continue;
}
}

4
Userland/Libraries/LibWebSocket/WebSocket.h
View file

@ -32,6 +32,8 @@ public:
ReadyState ready_state();
DeprecatedString subprotocol_in_use();
// Call this to start the WebSocket connection.
void start();
@ -95,6 +97,8 @@ private:
InternalState m_state { InternalState::NotStarted };
DeprecatedString m_subprotocol_in_use { DeprecatedString::empty() };
DeprecatedString m_websocket_key;
bool m_has_read_server_handshake_first_line { false };
bool m_has_read_server_handshake_upgrade { false };