rama-http-headers 0.3.0

use rama_http_types::{HeaderName, HeaderValue};

use crate::{Error, HeaderDecode, HeaderEncode, TypedHeader};

/// The `Sec-WebSocket-Version` header.
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub struct SecWebSocketVersion(u8);

impl SecWebSocketVersion {
    /// `Sec-WebSocket-Version: 13`
    pub const V13: Self = Self(13);
}

impl TypedHeader for SecWebSocketVersion {
    fn name() -> &'static HeaderName {
        &::rama_http_types::header::SEC_WEBSOCKET_VERSION
    }
}

impl HeaderDecode for SecWebSocketVersion {
    fn decode<'i, I: Iterator<Item = &'i HeaderValue>>(values: &mut I) -> Result<Self, Error> {
        values
            .next()
            .and_then(|value| if value == "13" { Some(Self::V13) } else { None })
            .ok_or_else(Error::invalid)
    }
}

impl HeaderEncode for SecWebSocketVersion {
    fn encode<E: Extend<HeaderValue>>(&self, values: &mut E) {
        debug_assert_eq!(self.0, 13);

        values.extend(::std::iter::once(HeaderValue::from_static("13")));
    }
}

#[cfg(test)]
mod tests {
    use super::super::{test_decode, test_encode};
    use super::SecWebSocketVersion;

    #[test]
    fn decode_v13() {
        assert_eq!(
            test_decode::<SecWebSocketVersion>(&["13"]),
            Some(SecWebSocketVersion::V13),
        );
    }

    #[test]
    fn decode_fail() {
        assert_eq!(test_decode::<SecWebSocketVersion>(&["1"]), None,);
    }

    #[test]
    fn encode_v13() {
        let headers = test_encode(SecWebSocketVersion::V13);
        assert_eq!(headers["sec-websocket-version"], "13");
    }
}