use std::fmt; use std::convert::{Into, From}; use sha1; use self::OpCode::*; /// Operation codes as part of rfc6455. #[derive(Debug, Eq, PartialEq, Clone, Copy)] pub(crate) enum OpCode { /// Indicates a continuation frame of a fragmented message. Continue, /// Indicates a text data frame. Text, /// Indicates a binary data frame. Binary, /// Indicates a close control frame. Close, /// Indicates a ping control frame. Ping, /// Indicates a pong control frame. Pong, /// Indicates an invalid opcode was received. Bad, } impl fmt::Display for OpCode { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { match *self { Continue => write!(f, "CONTINUE"), Text => write!(f, "TEXT"), Binary => write!(f, "BINARY"), Close => write!(f, "CLOSE"), Ping => write!(f, "PING"), Pong => write!(f, "PONG"), Bad => write!(f, "BAD"), } } } impl Into for OpCode { fn into(self) -> u8 { match self { Continue => 0, Text => 1, Binary => 2, Close => 8, Ping => 9, Pong => 10, Bad => { debug_assert!(false, "Attempted to convert invalid opcode to u8. This is a bug."); 8 // if this somehow happens, a close frame will help us tear down quickly } } } } impl From for OpCode { fn from(byte: u8) -> OpCode { match byte { 0 => Continue, 1 => Text, 2 => Binary, 8 => Close, 9 => Ping, 10 => Pong, _ => Bad } } } use self::CloseCode::*; /// Status code used to indicate why an endpoint is closing the `WebSocket` connection. #[derive(Debug, Eq, PartialEq, Clone, Copy)] pub enum CloseCode { /// Indicates a normal closure, meaning that the purpose for /// which the connection was established has been fulfilled. Normal, /// Indicates that an endpoint is "going away", such as a server /// going down or a browser having navigated away from a page. Away, /// Indicates that an endpoint is terminating the connection due /// to a protocol error. Protocol, /// 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, /// 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, /// 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, /// 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, /// 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, /// Indicates that an endpoint is terminating the connection /// because it has received a message that is too big for it to /// process. Size, /// 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, /// Indicates that a server is terminating the connection because /// it encountered an unexpected condition that prevented it from /// fulfilling the request. Error, /// 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, /// 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, #[doc(hidden)] Tls, #[doc(hidden)] Empty, #[doc(hidden)] Other(u16), } impl Into for CloseCode { fn into(self) -> u16 { match self { Normal => 1000, Away => 1001, Protocol => 1002, Unsupported => 1003, Status => 1005, Abnormal => 1006, Invalid => 1007, Policy => 1008, Size => 1009, Extension => 1010, Error => 1011, Restart => 1012, Again => 1013, Tls => 1015, Empty => 0, Other(code) => code, } } } impl From for CloseCode { fn from(code: u16) -> CloseCode { match code { 1000 => Normal, 1001 => Away, 1002 => Protocol, 1003 => Unsupported, 1005 => Status, 1006 => Abnormal, 1007 => Invalid, 1008 => Policy, 1009 => Size, 1010 => Extension, 1011 => Error, 1012 => Restart, 1013 => Again, 1015 => Tls, 0 => Empty, _ => Other(code), } } } static WS_GUID: &'static str = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"; static BASE64: &'static [u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; // TODO: hash is always same size, we dont need String pub(crate) fn hash_key(key: &[u8]) -> String { let mut hasher = sha1::Sha1::new(); hasher.update(key); hasher.update(WS_GUID.as_bytes()); encode_base64(&hasher.digest().bytes()) } // This code is based on rustc_serialize base64 STANDARD fn encode_base64(data: &[u8]) -> String { let len = data.len(); let mod_len = len % 3; let mut encoded = vec![b'='; (len + 2) / 3 * 4]; { let mut in_iter = data[..len - mod_len].iter().map(|&c| u32::from(c)); let mut out_iter = encoded.iter_mut(); let enc = |val| BASE64[val as usize]; let mut write = |val| *out_iter.next().unwrap() = val; while let (Some(one), Some(two), Some(three)) = (in_iter.next(), in_iter.next(), in_iter.next()) { let g24 = one << 16 | two << 8 | three; write(enc((g24 >> 18) & 63)); write(enc((g24 >> 12) & 63)); write(enc((g24 >> 6 ) & 63)); write(enc(g24 & 63)); } match mod_len { 1 => { let pad = u32::from(data[len-1]) << 16; write(enc((pad >> 18) & 63)); write(enc((pad >> 12) & 63)); } 2 => { let pad = u32::from(data[len-2]) << 16 | u32::from(data[len-1]) << 8; write(enc((pad >> 18) & 63)); write(enc((pad >> 12) & 63)); write(enc((pad >> 6) & 63)); } _ => (), } } String::from_utf8(encoded).unwrap() } mod test { #![allow(unused_imports, unused_variables, dead_code)] use super::*; #[test] fn opcode_from_u8() { let byte = 2u8; assert_eq!(OpCode::from(byte), OpCode::Binary); } #[test] fn opcode_into_u8() { let text = OpCode::Text; let byte: u8 = text.into(); assert_eq!(byte, 1u8); } #[test] fn closecode_from_u16() { let byte = 1008u16; assert_eq!(CloseCode::from(byte), CloseCode::Policy); } #[test] fn closecode_into_u16() { let text = CloseCode::Away; let byte: u16 = text.into(); assert_eq!(byte, 1001u16); } }