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//! Codes defined in RFC 6455
use std::fmt::Display;
/// WebSocket message opcode as in RFC 6455.
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum OpCode {
/// Data (text or binary).
Data(Data),
/// Control (close, ping, pong).
Control(Control),
}
/// Data opcodes as in RFC 6455
#[repr(u8)]
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum Data {
/// A continuation frame
Continuation = 0x0,
/// A text frame
Text = 0x1,
/// A binary frame
Binary = 0x2,
/// 0xb-f are reserved for further control frames
Reserved(u8),
}
/// Control opcodes as in RFC 6455
#[repr(u8)]
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum Control {
/// A close frame
Close = 0x8,
/// A ping frame
Ping = 0x9,
/// A pong frame
Pong = 0xA,
/// 0xb-f are reserved for further control frames
Reserved(u8),
}
impl Display for Data {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match *self {
Self::Continuation => write!(f, "CONTINUE"),
Self::Text => write!(f, "TEXT"),
Self::Binary => write!(f, "BINARY"),
Self::Reserved(other) => write!(f, "RESERVED_DATA_{other}'"),
}
}
}
impl Display for Control {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match *self {
Self::Close => write!(f, "CLOSE"),
Self::Ping => write!(f, "PING"),
Self::Pong => write!(f, "PONG"),
Self::Reserved(other) => write!(f, "RESERVED_CONTROL_{other}"),
}
}
}
impl Display for OpCode {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match *self {
Self::Data(d) => d.fmt(f),
Self::Control(c) => c.fmt(f),
}
}
}
impl From<OpCode> for u8 {
fn from(value: OpCode) -> Self {
match value {
self::OpCode::Data(self::Data::Continuation) => 0x0,
self::OpCode::Data(self::Data::Text) => 0x1,
self::OpCode::Data(self::Data::Binary) => 0x2,
self::OpCode::Data(self::Data::Reserved(i)) => i,
self::OpCode::Control(self::Control::Close) => 0x8,
self::OpCode::Control(self::Control::Ping) => 0x9,
self::OpCode::Control(self::Control::Pong) => 0xA,
self::OpCode::Control(self::Control::Reserved(i)) => i,
}
}
}
impl From<u8> for OpCode {
fn from(value: u8) -> Self {
match value {
0x0 => Self::Data(Data::Continuation),
0x1 => Self::Data(Data::Text),
0x2 => Self::Data(Data::Binary),
i @ 0x3..=0x7 => Self::Data(Data::Reserved(i)),
0x8 => Self::Control(Control::Close),
0x9 => Self::Control(Control::Ping),
0xA => Self::Control(Control::Pong),
i @ 0xB..=0xF => Self::Control(Control::Reserved(i)),
_ => panic!("Bug: OpCode out of range"),
}
}
}
/// Status code used to indicate why an endpoint is closing the WebSocket connection.
#[repr(u16)]
#[non_exhaustive]
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum CloseCode {
/// Indicates a normal closure, meaning that the purpose for
/// which the connection was established has been fulfilled.
Normal = 0x3e8,
/// Indicates that an endpoint is "going away", such as a server
/// going down or a browser having navigated away from a page.
Away = 0x3e9,
/// Indicates that an endpoint is terminating the connection due
/// to a protocol error.
Protocol = 0x3EA,
/// Indicates that an endpoint is terminating the connection
/// because it has received a type of data it cannot accept (e.g., an
/// endpoint that understands only text data MAY send this if it
/// receives a binary message).
Unsupported = 0x3EB,
/// Indicates that no status code was included in a closing frame. This
/// close code makes it possible to use a single method, `on_close` to
/// handle even cases where no close code was provided.
Status = 0x3ED,
/// Indicates an abnormal closure. If the abnormal closure was due to an
/// error, this close code will not be used. Instead, the `on_error` method
/// of the handler will be called with the error. However, if the connection
/// is simply dropped, without an error, this close code will be sent to the
/// handler.
Abnormal = 0x3EE,
/// Indicates that an endpoint is terminating the connection
/// because it has received data within a message that was not
/// consistent with the type of the message (e.g., non-UTF-8 \[RFC3629\]
/// data within a text message).
Invalid = 0x3EF,
/// Indicates that an endpoint is terminating the connection
/// because it has received a message that violates its policy. This
/// is a generic status code that can be returned when there is no
/// other more suitable status code (e.g., Unsupported or Size) or if there
/// is a need to hide specific details about the policy.
Policy = 0x3F0,
/// Indicates that an endpoint is terminating the connection
/// because it has received a message that is too big for it to
/// process.
Size = 0x3F1,
/// Indicates that an endpoint (client) is terminating the
/// connection because it has expected the server to negotiate one or
/// more extension, but the server didn't return them in the response
/// message of the WebSocket handshake. The list of extensions that
/// are needed should be given as the reason for closing.
/// Note that this status code is not used by the server, because it
/// can fail the WebSocket handshake instead.
Extension = 0x3F2,
/// Indicates that a server is terminating the connection because
/// it encountered an unexpected condition that prevented it from
/// fulfilling the request.
Error = 0x3F3,
/// Indicates that the server is restarting. A client may choose to reconnect,
/// and if it does, it should use a randomized delay of 5-30 seconds between attempts.
Restart = 0x3F4,
/// Indicates that the server is overloaded and the client should either connect
/// to a different IP (when multiple targets exist), or reconnect to the same IP
/// when a user has performed an action.
Again = 0x3F5,
#[doc(hidden)]
Tls = 0x3F7,
#[doc(hidden)]
Reserved(u16),
#[doc(hidden)]
Iana(u16),
#[doc(hidden)]
Library(u16),
#[doc(hidden)]
Bad(u16),
}
impl CloseCode {
/// Check if this CloseCode is allowed.
pub fn allowed(self) -> bool {
!matches!(
self,
Self::Bad(_) | Self::Reserved(_) | Self::Status | Self::Abnormal | Self::Tls
)
}
}
impl Display for CloseCode {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let code: u16 = self.into();
write!(f, "{code}")
}
}
impl From<CloseCode> for u16 {
fn from(value: CloseCode) -> u16 {
match value {
self::CloseCode::Normal => 0x3e8,
self::CloseCode::Away => 0x3e9,
self::CloseCode::Protocol => 0x3EA,
self::CloseCode::Unsupported => 0x3EB,
self::CloseCode::Status => 0x3ED,
self::CloseCode::Abnormal => 0x3EE,
self::CloseCode::Invalid => 0x3EF,
self::CloseCode::Policy => 0x3F0,
self::CloseCode::Size => 0x3F1,
self::CloseCode::Extension => 0x3F2,
self::CloseCode::Error => 0x3F3,
self::CloseCode::Restart => 0x3F4,
self::CloseCode::Again => 0x3F5,
self::CloseCode::Tls => 0x3F7,
self::CloseCode::Bad(other) => other,
self::CloseCode::Reserved(other) => other,
self::CloseCode::Iana(other) => other,
self::CloseCode::Library(other) => other,
}
}
}
impl<'t> From<&'t CloseCode> for u16 {
fn from(value: &'t CloseCode) -> Self {
(*value).into()
}
}
impl From<u16> for CloseCode {
fn from(value: u16) -> Self {
match value {
0x3e8 => Self::Normal,
0x3e9 => Self::Away,
0x3EA => Self::Protocol,
0x3EB => Self::Unsupported,
0x3ED => Self::Status,
0x3EE => Self::Abnormal,
0x3EF => Self::Invalid,
0x3F0 => Self::Policy,
0x3F1 => Self::Size,
0x3F2 => Self::Extension,
0x3F3 => Self::Error,
0x3F4 => Self::Restart,
0x3F5 => Self::Again,
0x3F7 => Self::Tls,
0x1..=0x3E7 => Self::Bad(value),
0x3F8..=0xBB7 => Self::Reserved(value),
0xBB8..=0xF9F => Self::Iana(value),
0xFA0..=0x1387 => Self::Library(value),
_ => Self::Bad(value),
}
}
}