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// Copyright (C) 2020 Sebastian Dröge <sebastian@centricular.com> // // Licensed under the MIT license, see the LICENSE file or <http://opensource.org/licenses/MIT> use super::*; /// Enum holding all possible RTSP message types. /// /// A `Message` can be a [`Request`](struct.Request.html), a [`Response`](struct.Response.html) or /// [`Data`](struct.Data.html). /// /// The body of the message is generic and usually a type that implements `AsRef<[u8]>`. For empty /// bodies there also exists the [`Empty`](struct.Empty.html) type. #[derive(Debug, PartialEq, Eq, Clone)] pub enum Message<Body> { /// Request message Request(Request<Body>), /// Response message Response(Response<Body>), /// Data message Data(Data<Body>), } impl<Body: AsRef<[u8]>> Message<Body> { pub(crate) fn borrow(&self) -> MessageRef { match self { Message::Request(request) => MessageRef::Request(request.borrow()), Message::Response(response) => MessageRef::Response(response.borrow()), Message::Data(data) => MessageRef::Data(data.borrow()), } } /// Serialize the message to any `std::io::Write`. /// /// Resuming writing after `std::io::ErrorKind::WouldBlock` is not supported. Any previously /// written data will have to be discarded for resuming. /// /// ## Serializing an RTSP message /// /// ```rust /// let request = rtsp_types::Request::builder( /// rtsp_types::Method::SetParameter, /// rtsp_types::Version::V2_0 /// ) /// .request_uri(rtsp_types::Url::parse("rtsp://example.com/test").expect("Invalid URI")) /// .header(rtsp_types::headers::CSEQ, "2") /// .header(rtsp_types::headers::CONTENT_TYPE, "text/parameters") /// .build(Vec::from(&b"barparam: barstuff"[..])); /// /// let mut data = Vec::new(); /// request.write(&mut data).expect("Failed to serialize request"); /// /// assert_eq!( /// data, /// b"SET_PARAMETER rtsp://example.com/test RTSP/2.0\r\n\ /// Content-Length: 18\r\n\ /// Content-Type: text/parameters\r\n\ /// CSeq: 2\r\n\ /// \r\n\ /// barparam: barstuff", /// ); /// ``` pub fn write<'b, W: std::io::Write + 'b>(&self, w: &'b mut W) -> Result<(), WriteError> { self.borrow().write(w) } /// Calculate the number of bytes needed to serialize the message. pub fn write_len(&self) -> u64 { self.borrow().write_len() } } impl<'a, T: From<&'a [u8]>> Message<T> { /// Try parse a message from a `&[u8]` and also return how many bytes were consumed. /// /// The body type of the returned message can be any type that implements `From<&[u8]>`. This /// includes `Vec<u8>` and `&[u8]` among others. /// /// If parsing the message succeeds, in addition to the message itself also the number of bytes /// that were consumed from the input data are returned. This allows the caller to advance to /// the next message. /// /// If parsing the message fails with [`ParseError::Incomplete`](enum.ParseError.html#variant.Incomplete) /// then the caller has to provide more data for successfully parsing the message. /// /// Otherwise, if parsing the message fails with [`ParseError::Error`](enum.ParseError.html#variant.Error) /// then the message can't be parsed and the caller can try skipping over some data until /// parsing succeeds again. /// /// ## Parsing an RTSP message /// /// ```rust /// let data = b"OPTIONS * RTSP/2.0\r\n\ /// CSeq: 1\r\n\ /// Supported: play.basic, play.scale\r\n\ /// User-Agent: PhonyClient/1.2\r\n\ /// \r\n"; /// /// let (message, consumed): (rtsp_types::Message<Vec<u8>>, _) = /// rtsp_types::Message::parse(data).expect("Failed to parse data"); /// /// assert_eq!(consumed, data.len()); /// match message { /// rtsp_types::Message::Request(ref request) => { /// assert_eq!(request.method(), rtsp_types::Method::Options); /// }, /// _ => unreachable!(), /// } /// ``` pub fn parse<B: AsRef<[u8]> + 'a + ?Sized>(buf: &'a B) -> Result<(Self, usize), ParseError> { let buf = buf.as_ref(); let (msg, consumed) = MessageRef::parse(buf)?; Ok((msg.to_owned()?, consumed)) } } /// RTSP method. /// /// See [RFC 7826 section 13](https://tools.ietf.org/html/rfc7826#section-13) for the details about /// each method. #[derive(Debug, PartialEq, Eq, Clone)] pub enum Method { /// Describe Describe, /// Get parameter GetParameter, /// Options Options, /// Pause Pause, /// Play Play, /// Play notify (only RTSP 2.0) PlayNotify, /// Redirect Redirect, /// Setup Setup, /// Set parameter SetParameter, /// Teardown Teardown, /// Extension method Extension(String), } impl Method { pub(crate) fn borrow(&self) -> MethodRef { match self { Method::Describe => MethodRef::Describe, Method::GetParameter => MethodRef::GetParameter, Method::Options => MethodRef::Options, Method::Pause => MethodRef::Pause, Method::Play => MethodRef::Play, Method::PlayNotify => MethodRef::PlayNotify, Method::Redirect => MethodRef::Redirect, Method::Setup => MethodRef::Setup, Method::SetParameter => MethodRef::SetParameter, Method::Teardown => MethodRef::Teardown, Method::Extension(s) => MethodRef::Extension(&s), } } } /// Parses a method from a `&str`. impl<'a> From<&'a str> for Method { fn from(v: &'a str) -> Self { MethodRef::from(v).to_owned() } } /// Converts a method into a `&str`. impl<'a> From<&'a Method> for &'a str { fn from(v: &'a Method) -> Self { match v { Method::Describe => "DESCRIBE", Method::GetParameter => "GET_PARAMETER", Method::Options => "OPTIONS", Method::Pause => "PAUSE", Method::Play => "PLAY", Method::PlayNotify => "PLAY_NOTIFY", Method::Redirect => "REDIRECT", Method::Setup => "SETUP", Method::SetParameter => "SET_PARAMETER", Method::Teardown => "TEARDOWN", Method::Extension(ref v) => v, } } } impl PartialEq<Method> for &Method { fn eq(&self, other: &Method) -> bool { (*self).eq(other) } } /// RTSP Request. /// /// Represents an RTSP request and providers functions to construct, modify and read requests. /// /// See [RFC 7826 section 7](https://tools.ietf.org/html/rfc7826#section-7) for the details about /// methods. /// /// ## Creating an `OPTIONS` request /// /// ```rust /// let request = rtsp_types::Request::builder( /// rtsp_types::Method::Options, /// rtsp_types::Version::V2_0 /// ) /// .header(rtsp_types::headers::CSEQ, "1") /// .empty(); /// ``` /// /// This request contains an empty body. /// /// ## Creating a `SET_PARAMETER` request with a request body /// /// ```rust /// let request = rtsp_types::Request::builder( /// rtsp_types::Method::SetParameter, /// rtsp_types::Version::V2_0 /// ) /// .request_uri(rtsp_types::Url::parse("rtsp://example.com/test").expect("Invalid URI")) /// .header(rtsp_types::headers::CSEQ, "2") /// .header(rtsp_types::headers::CONTENT_TYPE, "text/parameters") /// .build(Vec::from(&b"barparam: barstuff"[..])); /// ``` #[derive(Debug, Clone, Eq)] pub struct Request<Body> { pub(crate) method: Method, pub(crate) request_uri: Option<Url>, pub(crate) version: Version, pub(crate) headers: Headers, pub(crate) body: Body, } impl<BodyA, BodyB: PartialEq<BodyA>> PartialEq<Request<BodyA>> for Request<BodyB> { fn eq(&self, other: &Request<BodyA>) -> bool { self.method == other.method && self.request_uri == other.request_uri && self.version == other.version && self.headers == other.headers && self.body == other.body } } impl Request<Empty> { /// Build a new `Request` for a given method and RTSP version. pub fn builder(method: Method, version: Version) -> RequestBuilder { RequestBuilder::new(method, version) } } impl<Body> Request<Body> { pub(crate) fn borrow(&self) -> RequestRef where Body: AsRef<[u8]>, { let headers = self .headers .iter() .map(|(name, value)| HeaderRef { name: name.as_str(), value: value.as_str(), }) .collect(); RequestRef { method: self.method.borrow(), request_uri: self.request_uri.as_ref().map(|u| u.as_str()), version: self.version, headers, body: self.body.as_ref(), } } /// Serialize the request to any `std::io::Write`. /// /// Resuming writing after `std::io::ErrorKind::WouldBlock` is not supported. Any previously /// written data will have to be discarded for resuming. pub fn write<'b, W: std::io::Write + 'b>(&self, w: &'b mut W) -> Result<(), WriteError> where Body: AsRef<[u8]>, { self.borrow().write(w) } /// Calculate the number of bytes needed to serialize the request. pub fn write_len(&self) -> u64 where Body: AsRef<[u8]>, { self.borrow().write_len() } // Accessors /// Get the method of the request. pub fn method(&self) -> &Method { &self.method } /// Set the method of the request. pub fn set_method(&mut self, method: Method) { self.method = method; } /// Get the request URI of the request. pub fn request_uri(&self) -> Option<&Url> { self.request_uri.as_ref() } /// Set the request URI of the request. pub fn set_request_uri(&mut self, request_uri: Option<Url>) { self.request_uri = request_uri; } /// Get the version of the request. pub fn version(&self) -> Version { self.version } /// Set the version of the request. pub fn set_version(&mut self, version: Version) { self.version = version; } /// Get the body of the request. pub fn body(&self) -> &Body { &self.body } // Body API /// Convert the request into its body. pub fn into_body(self) -> Body { self.body } /// Modify the body of the request with a closure. /// /// This replaces the `Content-Length` header of the message with the length of the new body. pub fn map_body<NewBody: AsRef<[u8]>, F: FnOnce(Body) -> NewBody>( self, func: F, ) -> Request<NewBody> { let Request { method, request_uri, version, mut headers, body, } = self; let new_body = func(body); { let new_body = new_body.as_ref(); if new_body.is_empty() { headers.remove(&crate::headers::CONTENT_LENGTH); } else { headers.insert( crate::headers::CONTENT_LENGTH, HeaderValue::from(format!("{}", new_body.len())), ); } } Request { method, request_uri, version, headers, body: new_body, } } /// Replace the body of the request with a different body. /// /// This replaces the `Content-Length` header of the message with the length of the new body. pub fn replace_body<NewBody: AsRef<[u8]>>(self, new_body: NewBody) -> Request<NewBody> { let Request { method, request_uri, version, mut headers, body: _body, } = self; { let new_body = new_body.as_ref(); if new_body.is_empty() { headers.remove(&crate::headers::CONTENT_LENGTH); } else { headers.insert( crate::headers::CONTENT_LENGTH, HeaderValue::from(format!("{}", new_body.len())), ); } } Request { method, request_uri, version, headers, body: new_body, } } // Header API /// Appends a value to an existing RTSP header or inserts it. /// /// Additional values are comma separated as defined in [RFC 7826 section 5.2](https://tools.ietf.org/html/rfc7826#section-5.2). pub fn append_header<V: Into<HeaderValue>>(&mut self, name: HeaderName, value: V) { let value = value.into(); self.headers.append(name, value); } /// Insert an RTSP header with its value. /// /// If a header with the same name already exists then its value will be replaced. /// /// See [`append`](#method.append) for appending additional values to a header. pub fn insert_header<V: Into<HeaderValue>>(&mut self, name: HeaderName, value: V) { let value = value.into(); self.headers.insert(name, value); } /// Removes and RTSP header if it exists. pub fn remove_header(&mut self, name: &HeaderName) { self.headers.remove(name); } /// Gets an RTSP header value if it exists. pub fn header(&self, name: &HeaderName) -> Option<&HeaderValue> { self.headers.get(name) } /// Gets a mutable reference to an RTSP header value if it exists. pub fn header_mut(&mut self, name: &HeaderName) -> Option<&mut HeaderValue> { self.headers.get_mut(name) } /// Iterator over all header name and value pairs. pub fn headers(&self) -> impl Iterator<Item = (&HeaderName, &HeaderValue)> { self.headers.iter() } /// Iterator over all header names. pub fn header_names(&self) -> impl Iterator<Item = &HeaderName> { self.headers.names() } /// Iterator over all header values. pub fn header_values(&self) -> impl Iterator<Item = &HeaderValue> { self.headers.values() } } impl<Body> AsRef<Headers> for Request<Body> { fn as_ref(&self) -> &Headers { &self.headers } } impl<Body> AsMut<Headers> for Request<Body> { fn as_mut(&mut self) -> &mut Headers { &mut self.headers } } /// RTSP request builder. /// /// See [`Request::builder`](struct.Request.html#method.builder) for details. #[derive(Debug, PartialEq, Eq, Clone)] pub struct RequestBuilder(Request<Empty>); impl RequestBuilder { fn new(method: Method, version: Version) -> Self { Self(Request { method, request_uri: None, version, headers: Headers::new(), body: Empty, }) } /// Set the optional request URI. pub fn request_uri<U: Into<Url>>(self, request_uri: U) -> Self { Self(Request { request_uri: Some(request_uri.into()), ..self.0 }) } /// Append a header to the request. pub fn header<V: Into<HeaderValue>>(mut self, name: HeaderName, value: V) -> Self { let value = value.into(); self.0.headers.append(name, value); self } /// Build a request with an empty body. pub fn empty(self) -> Request<Empty> { self.0 } /// Build a request with a provided body. /// /// This inserts the `Content-Length` header with the length of the body if it is not empty. pub fn build<Body: AsRef<[u8]>>(mut self, body: Body) -> Request<Body> { { let body = body.as_ref(); if !body.is_empty() { self.0.headers.insert( crate::headers::CONTENT_LENGTH, HeaderValue::from(format!("{}", body.len())), ); } } Request { method: self.0.method, request_uri: self.0.request_uri, version: self.0.version, headers: self.0.headers, body, } } } /// RTSP Response. /// /// Represents an RTSP response and providers functions to construct, modify and read responses. /// /// See [RFC 7826 section 8](https://tools.ietf.org/html/rfc7826#section-8) for the details about /// methods. /// /// ## Creating an `OK` response /// /// ```rust /// let response = rtsp_types::Response::builder( /// rtsp_types::Version::V2_0, /// rtsp_types::StatusCode::Ok, /// ) /// .header(rtsp_types::headers::CSEQ, "1") /// .empty(); /// ``` #[derive(Debug, Clone, Eq)] pub struct Response<Body> { pub(crate) version: Version, pub(crate) status: StatusCode, pub(crate) reason_phrase: String, pub(crate) headers: Headers, pub(crate) body: Body, } impl<BodyA, BodyB: PartialEq<BodyA>> PartialEq<Response<BodyA>> for Response<BodyB> { fn eq(&self, other: &Response<BodyA>) -> bool { self.version == other.version && self.status == other.status && self.reason_phrase == other.reason_phrase && self.headers == other.headers && self.body == other.body } } impl Response<Empty> { /// Build a new `Response` for a given RTSP version and status code. pub fn builder(version: Version, status: StatusCode) -> ResponseBuilder { ResponseBuilder::new(version, status) } } impl<Body> Response<Body> { pub(crate) fn borrow(&self) -> ResponseRef where Body: AsRef<[u8]>, { let headers = self .headers .iter() .map(|(name, value)| HeaderRef { name: name.as_str(), value: value.as_str(), }) .collect(); ResponseRef { version: self.version, status: self.status, reason_phrase: &self.reason_phrase, headers, body: self.body.as_ref(), } } /// Serialize the response to any `std::io::Write`. /// /// Resuming writing after `std::io::ErrorKind::WouldBlock` is not supported. Any previously /// written data will have to be discarded for resuming. pub fn write<'b, W: std::io::Write + 'b>(&self, w: &'b mut W) -> Result<(), WriteError> where Body: AsRef<[u8]>, { self.borrow().write(w) } /// Calculate the number of bytes needed to serialize the response. pub fn write_len(&self) -> u64 where Body: AsRef<[u8]>, { self.borrow().write_len() } // Accessors /// Get the version of the response. pub fn version(&self) -> Version { self.version } /// Set the version of the response. pub fn set_version(&mut self, version: Version) { self.version = version; } /// Get the status code of the response. pub fn status(&self) -> StatusCode { self.status } /// Set the status code of the response. pub fn set_status(&mut self, status: StatusCode) { self.status = status; } /// Get the reason phrase of the response. pub fn reason_phrase(&self) -> &str { self.reason_phrase.as_str() } /// Set the reason phrase of the response. pub fn set_reason_phrase<S: Into<String>>(&mut self, reason_phrase: S) { self.reason_phrase = reason_phrase.into(); } /// Get the body of the response. pub fn body(&self) -> &Body { &self.body } // Body API /// Convert the response into its body. pub fn into_body(self) -> Body { self.body } /// Modify the body of the response with a closure. /// /// This replaces the `Content-Length` header of the message with the length of the new body. pub fn map_body<NewBody: AsRef<[u8]>, F: FnOnce(Body) -> NewBody>( self, func: F, ) -> Response<NewBody> { let Response { version, status, reason_phrase, mut headers, body, } = self; let new_body = func(body); { let new_body = new_body.as_ref(); if new_body.is_empty() { headers.remove(&crate::headers::CONTENT_LENGTH); } else { headers.insert( crate::headers::CONTENT_LENGTH, HeaderValue::from(format!("{}", new_body.len())), ); } } Response { version, status, reason_phrase, headers, body: new_body, } } /// Replace the body of the response with a different body. /// /// This replaces the `Content-Length` header of the message with the length of the new body. pub fn replace_body<NewBody: AsRef<[u8]>>(self, new_body: NewBody) -> Response<NewBody> { let Response { version, status, reason_phrase, mut headers, body: _body, } = self; { let new_body = new_body.as_ref(); if new_body.is_empty() { headers.remove(&crate::headers::CONTENT_LENGTH); } else { headers.insert( crate::headers::CONTENT_LENGTH, HeaderValue::from(format!("{}", new_body.len())), ); } } Response { version, status, reason_phrase, headers, body: new_body, } } // Header API /// Appends a value to an existing RTSP header or inserts it. /// /// Additional values are comma separated as defined in [RFC 7826 section 5.2](https://tools.ietf.org/html/rfc7826#section-5.2). pub fn append_header<V: Into<HeaderValue>>(&mut self, name: HeaderName, value: V) { let value = value.into(); self.headers.append(name, value); } /// Insert an RTSP header with its value. /// /// If a header with the same name already exists then its value will be replaced. /// /// See [`append`](#method.append) for appending additional values to a header. pub fn insert_header<V: Into<HeaderValue>>(&mut self, name: HeaderName, value: V) { let value = value.into(); self.headers.insert(name, value); } /// Removes and RTSP header if it exists. pub fn remove_header(&mut self, name: &HeaderName) { self.headers.remove(name); } /// Gets an RTSP header value if it exists. pub fn header(&self, name: &HeaderName) -> Option<&HeaderValue> { self.headers.get(name) } /// Gets a mutable reference to an RTSP header value if it exists. pub fn header_mut(&mut self, name: &HeaderName) -> Option<&mut HeaderValue> { self.headers.get_mut(name) } /// Iterator over all header name and value pairs. pub fn headers(&self) -> impl Iterator<Item = (&HeaderName, &HeaderValue)> { self.headers.iter() } /// Iterator over all header names. pub fn header_names(&self) -> impl Iterator<Item = &HeaderName> { self.headers.names() } /// Iterator over all header values. pub fn header_values(&self) -> impl Iterator<Item = &HeaderValue> { self.headers.values() } } impl<Body> AsRef<Headers> for Response<Body> { fn as_ref(&self) -> &Headers { &self.headers } } impl<Body> AsMut<Headers> for Response<Body> { fn as_mut(&mut self) -> &mut Headers { &mut self.headers } } /// RTSP response builder. /// /// See [`Response::builder`](struct.Response.html#method.builder) for details. #[derive(Debug, PartialEq, Eq, Clone)] pub struct ResponseBuilder(Response<Empty>, Option<String>); impl ResponseBuilder { fn new(version: Version, status: StatusCode) -> Self { let response = Response { version, status, reason_phrase: String::new(), headers: Headers::new(), body: Empty, }; Self(response, None) } /// Set the reason phrase of the response. /// /// If not set then a default reason phrase will be used based on the status code. pub fn reason_phrase<S: Into<String>>(mut self, reason_phrase: S) -> Self { let reason_phrase = reason_phrase.into(); self.1 = Some(reason_phrase); self } /// Append a header to the response. pub fn header<V: Into<HeaderValue>>(mut self, name: HeaderName, value: V) -> Self { let value = value.into(); self.0.headers.append(name, value); self } /// Build a response with an empty body. pub fn empty(self) -> Response<Empty> { let ResponseBuilder(mut response, reason_phrase) = self; response.reason_phrase = reason_phrase.unwrap_or_else(|| response.status.to_string()); response } /// Build a response with a provided body. /// /// This inserts the `Content-Length` header with the length of the body if it is not empty. pub fn build<Body: AsRef<[u8]>>(self, body: Body) -> Response<Body> { let ResponseBuilder(mut response, reason_phrase) = self; { let body = body.as_ref(); if !body.is_empty() { response.headers.insert( crate::headers::CONTENT_LENGTH, HeaderValue::from(format!("{}", body.len())), ); } } let reason_phrase = reason_phrase.unwrap_or_else(|| response.status.to_string()); Response { version: response.version, status: response.status, reason_phrase, headers: response.headers, body, } } } /// RTSP data message. /// /// See [RFC 7826 section 14](https://tools.ietf.org/html/rfc7826#section-14) for details about the /// data message. #[derive(Debug, Clone, Eq)] pub struct Data<Body> { pub(crate) channel_id: u8, pub(crate) body: Body, } impl<BodyA, BodyB: PartialEq<BodyA>> PartialEq<Data<BodyA>> for Data<BodyB> { fn eq(&self, other: &Data<BodyA>) -> bool { self.channel_id == other.channel_id && self.body == other.body } } impl<Body> Data<Body> { pub(crate) fn borrow(&self) -> DataRef where Body: AsRef<[u8]>, { DataRef { channel_id: self.channel_id, body: self.body.as_ref(), } } /// Create a new data message for a given channel id and body. pub fn new(channel_id: u8, body: Body) -> Self { Self { channel_id, body } } /// Serialize the data to any `std::io::Write`. /// /// Resuming writing after `std::io::ErrorKind::WouldBlock` is not supported. Any previously /// written data will have to be discarded for resuming. pub fn write<'b, W: std::io::Write + 'b>(&self, w: &'b mut W) -> Result<(), WriteError> where Body: AsRef<[u8]>, { self.borrow().write(w) } /// Calculate the number of bytes needed to serialize the data. pub fn write_len(&self) -> u64 where Body: AsRef<[u8]>, { self.borrow().write_len() } // Accessors /// Get the channel id of the data message. pub fn channel_id(&self) -> u8 { self.channel_id } /// Set the channel id of the data message. pub fn set_channel_id(&mut self, channel_id: u8) { self.channel_id = channel_id; } /// Get the length of the data message. pub fn len(&self) -> usize where Body: AsRef<[u8]>, { self.body.as_ref().len() } /// Check if the body of the data message is empty. pub fn is_empty(&self) -> bool where Body: AsRef<[u8]>, { self.body.as_ref().is_empty() } /// Get a `&[u8]` slice for the body of the data message. pub fn as_slice(&self) -> &[u8] where Body: AsRef<[u8]>, { self.body.as_ref() } // Body API /// Convert the data message into its body. pub fn into_body(self) -> Body { self.body } /// Modify the body of the data message with a closure. pub fn map_body<NewBody, F: FnOnce(Body) -> NewBody>(self, func: F) -> Data<NewBody> { Data { channel_id: self.channel_id, body: func(self.body), } } /// Replace the body of the data message with a different body. pub fn replace_body<NewBody>(self, new_body: NewBody) -> Data<NewBody> { Data { channel_id: self.channel_id, body: new_body, } } } impl Data<Vec<u8>> { /// Create a new data message from a `Vec<u8>`. pub fn from_vec(channel_id: u8, body: Vec<u8>) -> Self { Self { channel_id, body } } } impl<Body: AsRef<[u8]>> AsRef<[u8]> for Data<Body> { fn as_ref(&self) -> &[u8] { self.body.as_ref() } }