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
144
145
146
147
148
149
150
151
152
153

use crate::error::Error;

/// Kind of proxy connection (Basic, Digest, etc)
#[derive(Clone, Debug, PartialEq)]
pub(crate) enum ProxyKind {
    Basic,
}

/// Proxy server definition
#[derive(Clone, Debug, PartialEq)]
pub struct Proxy {
    pub(crate) server: String,
    pub(crate) port: u32,
    pub(crate) user: Option<String>,
    pub(crate) password: Option<String>,
    pub(crate) kind: ProxyKind,
}

impl Proxy {
    fn parse_creds<S: AsRef<str>>(
        creds: &Option<S>,
    ) -> Result<(Option<String>, Option<String>), Error> {
        match creds {
            Some(creds) => {
                let mut parts = creds
                    .as_ref()
                    .splitn(2, ':')
                    .collect::<Vec<&str>>()
                    .into_iter();

                if parts.len() != 2 {
                    Err(Error::BadProxyCreds)
                } else {
                    Ok((
                        parts.next().map(String::from),
                        parts.next().map(String::from),
                    ))
                }
            }
            None => Ok((None, None)),
        }
    }

    fn parse_address<S: AsRef<str>>(host: &Option<S>) -> Result<(String, Option<u32>), Error> {
        match host {
            Some(host) => {
                let mut parts = host.as_ref().split(':').collect::<Vec<&str>>().into_iter();
                let host = parts.next().ok_or(Error::BadProxy)?;
                let port = parts.next();
                Ok((
                    String::from(host),
                    port.and_then(|port| port.parse::<u32>().ok()),
                ))
            }
            None => Err(Error::BadProxy),
        }
    }

    fn use_authorization(&self) -> bool {
        self.user.is_some() && self.password.is_some()
    }

    /// A proxy server
    ///
    /// Create a proxy server to be used with HTTP(S) connections.
    ///
    /// # Example
    ///
    /// ```
    /// let proxy = minreq::Proxy::new("user:password@localhost:8080").unwrap();
    /// let request = minreq::post("http://example.com").with_proxy(proxy);
    /// ```
    ///
    pub fn new<S: AsRef<str>>(proxy: S) -> Result<Self, Error> {
        let mut parts = proxy
            .as_ref()
            .rsplitn(2, '@')
            .collect::<Vec<&str>>()
            .into_iter()
            .rev();

        let (user, password) = if parts.len() == 2 {
            Proxy::parse_creds(&parts.next())?
        } else {
            (None, None)
        };

        let (server, port) = Proxy::parse_address(&parts.next())?;

        Ok(Self {
            server,
            user,
            password,
            port: port.unwrap_or(8080),
            kind: ProxyKind::Basic,
        })
    }

    pub(crate) fn connect<S: AsRef<str>>(&self, host: S) -> String {
        let authorization = if self.use_authorization() {
            match self.kind {
                ProxyKind::Basic => {
                    let creds = base64::encode(&format!(
                        "{}:{}",
                        self.user.clone().unwrap_or_default(),
                        self.password.clone().unwrap_or_default()
                    ));
                    format!("Proxy-Authorization: basic {}\r\n", creds)
                }
            }
        } else {
            String::new()
        };

        format!(
            "CONNECT {} HTTP/1.1\r\n\
Host: {}\r\n\
User-Agent: something/1.0.0\r\n\
Proxy-Connection: Keep-Alive\r\n\
{}\
\r\n",
            host.as_ref(),
            host.as_ref(),
            authorization
        )
    }

    pub(crate) fn verify_response(response: &[u8]) -> Result<(), Error> {
        let response_string = String::from_utf8_lossy(response);
        let top_line = response_string.lines().next().ok_or(Error::ProxyConnect)?;
        let status_code = top_line.split_whitespace().nth(1).ok_or(Error::BadProxy)?;

        match status_code {
            "200" => Ok(()),
            "401" | "407" => Err(Error::InvalidProxyCreds),
            _ => Err(Error::BadProxy),
        }
    }
}

#[cfg(test)]
mod tests {
    use super::Proxy;

    #[test]
    fn parse_proxy() {
        let proxy = Proxy::new("user:p@ssw0rd@localhost:9999").unwrap();
        assert_eq!(proxy.user, Some(String::from("user")));
        assert_eq!(proxy.password, Some(String::from("p@ssw0rd")));
        assert_eq!(proxy.server, String::from("localhost"));
        assert_eq!(proxy.port, 9999);
    }
}