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

//! Challenge for the "Basic" HTTP Authentication Scheme

use std::borrow::Cow;
use std::default::Default;
use std::fmt;
use std::str;

use actix_web::http::header::{HeaderValue, InvalidHeaderValue, TryIntoHeaderValue};
use actix_web::web::{BufMut, Bytes, BytesMut};

use super::Challenge;
use crate::utils;

/// Challenge for [`WWW-Authenticate`] header with HTTP Basic auth scheme,
/// described in [RFC 7617](https://tools.ietf.org/html/rfc7617)
///
/// ## Example
///
/// ```
/// # use actix_web::{web, App, HttpRequest, HttpResponse, HttpServer};
/// use actix_web_httpauth::headers::www_authenticate::basic::Basic;
/// use actix_web_httpauth::headers::www_authenticate::WwwAuthenticate;
///
/// fn index(_req: HttpRequest) -> HttpResponse {
///     let challenge = Basic::with_realm("Restricted area");
///
///     HttpResponse::Unauthorized()
///         .insert_header(WwwAuthenticate(challenge))
///         .finish()
/// }
/// ```
///
/// [`WWW-Authenticate`]: ../struct.WwwAuthenticate.html
#[derive(Eq, PartialEq, Ord, PartialOrd, Hash, Debug, Default, Clone)]
pub struct Basic {
    // "realm" parameter is optional now: https://tools.ietf.org/html/rfc7235#appendix-A
    pub(crate) realm: Option<Cow<'static, str>>,
}

impl Basic {
    /// Creates new `Basic` challenge with an empty `realm` field.
    ///
    /// ## Example
    ///
    /// ```
    /// # use actix_web_httpauth::headers::www_authenticate::basic::Basic;
    /// let challenge = Basic::new();
    /// ```
    pub fn new() -> Basic {
        Default::default()
    }

    /// Creates new `Basic` challenge from the provided `realm` field value.
    ///
    /// ## Examples
    ///
    /// ```
    /// # use actix_web_httpauth::headers::www_authenticate::basic::Basic;
    /// let challenge = Basic::with_realm("Restricted area");
    /// ```
    ///
    /// ```
    /// # use actix_web_httpauth::headers::www_authenticate::basic::Basic;
    /// let my_realm = "Earth realm".to_string();
    /// let challenge = Basic::with_realm(my_realm);
    /// ```
    pub fn with_realm<T>(value: T) -> Basic
    where
        T: Into<Cow<'static, str>>,
    {
        Basic {
            realm: Some(value.into()),
        }
    }
}

#[doc(hidden)]
impl Challenge for Basic {
    fn to_bytes(&self) -> Bytes {
        // 5 is for `"Basic"`, 9 is for `"realm=\"\""`
        let length = 5 + self.realm.as_ref().map_or(0, |realm| realm.len() + 9);
        let mut buffer = BytesMut::with_capacity(length);
        buffer.put(&b"Basic"[..]);
        if let Some(ref realm) = self.realm {
            buffer.put(&b" realm=\""[..]);
            utils::put_quoted(&mut buffer, realm);
            buffer.put_u8(b'"');
        }

        buffer.freeze()
    }
}

impl fmt::Display for Basic {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
        let bytes = self.to_bytes();
        let repr = str::from_utf8(&bytes)
            // Should not happen since challenges are crafted manually
            // from a `&'static str` or `String`
            .map_err(|_| fmt::Error)?;

        f.write_str(repr)
    }
}

impl TryIntoHeaderValue for Basic {
    type Error = InvalidHeaderValue;

    fn try_into_value(self) -> Result<HeaderValue, Self::Error> {
        HeaderValue::from_maybe_shared(self.to_bytes())
    }
}

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

    #[test]
    fn test_plain_into_header_value() {
        let challenge = Basic { realm: None };

        let value = challenge.try_into_value();
        assert!(value.is_ok());
        let value = value.unwrap();
        assert_eq!(value, "Basic");
    }

    #[test]
    fn test_with_realm_into_header_value() {
        let challenge = Basic {
            realm: Some("Restricted area".into()),
        };

        let value = challenge.try_into_value();
        assert!(value.is_ok());
        let value = value.unwrap();
        assert_eq!(value, "Basic realm=\"Restricted area\"");
    }
}