1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143

use std::fmt::{self, Display};
use std::str::FromStr;
use unicase::UniCase;

pub use self::ConnectionOption::{KeepAlive, Close, ConnectionHeader};

const KEEP_ALIVE: UniCase<&'static str> = UniCase("keep-alive");
const CLOSE: UniCase<&'static str> = UniCase("close");

/// Values that can be in the `Connection` header.
#[derive(Clone, PartialEq, Debug)]
pub enum ConnectionOption {
    /// The `keep-alive` connection value.
    KeepAlive,
    /// The `close` connection value.
    Close,
    /// Values in the Connection header that are supposed to be names of other Headers.
    ///
    /// > When a header field aside from Connection is used to supply control
    /// > information for or about the current connection, the sender MUST list
    /// > the corresponding field-name within the Connection header field.
    // TODO: it would be nice if these "Strings" could be stronger types, since
    // they are supposed to relate to other Header fields (which we have strong
    // types for).
    ConnectionHeader(UniCase<String>),
}

impl FromStr for ConnectionOption {
    type Err = ();
    fn from_str(s: &str) -> Result<ConnectionOption, ()> {
        if UniCase(s) == KEEP_ALIVE {
            Ok(KeepAlive)
        } else if UniCase(s) == CLOSE {
            Ok(Close)
        } else {
            Ok(ConnectionHeader(UniCase(s.to_owned())))
        }
    }
}

impl Display for ConnectionOption {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.write_str(match *self {
            KeepAlive => "keep-alive",
            Close => "close",
            ConnectionHeader(UniCase(ref s)) => s.as_ref()
        })
    }
}

header! {
    /// `Connection` header, defined in
    /// [RFC7230](http://tools.ietf.org/html/rfc7230#section-6.1)
    ///
    /// The `Connection` header field allows the sender to indicate desired
    /// control options for the current connection.  In order to avoid
    /// confusing downstream recipients, a proxy or gateway MUST remove or
    /// replace any received connection options before forwarding the
    /// message.
    ///
    /// # ABNF
    /// ```plain
    /// Connection        = 1#connection-option
    /// connection-option = token
    ///
    /// # Example values
    /// * `close`
    /// * `keep-alive`
    /// * `upgrade`
    /// ```
    ///
    /// # Examples
    /// ```
    /// use mco_http::header::{Headers, Connection};
    ///
    /// let mut headers = Headers::new();
    /// headers.set(Connection::keep_alive());
    /// ```
    /// ```
    /// # extern crate mco_http;
    /// # extern crate unicase;
    /// # fn main() {
    /// // extern crate unicase;
    ///
    /// use mco_http::header::{Headers, Connection, ConnectionOption};
    /// use unicase::UniCase;
    ///
    /// let mut headers = Headers::new();
    /// headers.set(
    ///     Connection(vec![
    ///         ConnectionOption::ConnectionHeader(UniCase("upgrade".to_owned())),
    ///     ])
    /// );
    /// # }
    /// ```
    (Connection, "Connection") => (ConnectionOption)+

    test_connection {
        test_header!(test1, vec![b"close"]);
        test_header!(test2, vec![b"keep-alive"]);
        test_header!(test3, vec![b"upgrade"]);
    }
}

impl Connection {
    /// A constructor to easily create a `Connection: close` header.
    #[inline]
    pub fn close() -> Connection {
        Connection(vec![ConnectionOption::Close])
    }

    /// A constructor to easily create a `Connection: keep-alive` header.
    #[inline]
    pub fn keep_alive() -> Connection {
        Connection(vec![ConnectionOption::KeepAlive])
    }
}

bench_header!(close, Connection, { vec![b"close".to_vec()] });
bench_header!(keep_alive, Connection, { vec![b"keep-alive".to_vec()] });
bench_header!(header, Connection, { vec![b"authorization".to_vec()] });

#[cfg(test)]
mod tests {
    use super::{Connection,ConnectionHeader};
    use crate::header::Header;
    use unicase::UniCase;

    fn parse_option(header: Vec<u8>) -> Connection {
        let val = vec![header];
        let connection: Connection = Header::parse_header(&val[..]).unwrap();
        connection
    }

    #[test]
    fn test_parse() {
        assert_eq!(Connection::close(),parse_option(b"close".to_vec()));
        assert_eq!(Connection::keep_alive(),parse_option(b"keep-alive".to_vec()));
        assert_eq!(Connection::keep_alive(),parse_option(b"Keep-Alive".to_vec()));
        assert_eq!(Connection(vec![ConnectionHeader(UniCase("upgrade".to_owned()))]),
            parse_option(b"upgrade".to_vec()));
    }
}