    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

    use std::{convert::From, error::Error, fmt, str};

    use actix_web::http::header;

    /// Possible errors while parsing `Authorization` header.
    ///
    /// Should not be used directly unless you are implementing your own
    /// [authentication scheme](super::Scheme).
    #[derive(Debug)]
    pub enum ParseError {
        /// Header value is malformed.
        Invalid,

        /// Authentication scheme is missing.
        MissingScheme,

        /// Required authentication field is missing.
        MissingField(&'static str),

        /// Unable to convert header into the str.
        ToStrError(header::ToStrError),

        /// Malformed base64 string.
        Base64DecodeError(base64::DecodeError),

        /// Malformed UTF-8 string.
        Utf8Error(str::Utf8Error),
    }

    impl fmt::Display for ParseError {
        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
            match self {
                ParseError::Invalid => f.write_str("Invalid header value"),
                ParseError::MissingScheme => f.write_str("Missing authorization scheme"),
                ParseError::MissingField(field) => write!(f, "Missing header field ({field})"),
                ParseError::ToStrError(err) => fmt::Display::fmt(err, f),
                ParseError::Base64DecodeError(err) => fmt::Display::fmt(err, f),
                ParseError::Utf8Error(err) => fmt::Display::fmt(err, f),
            }
        }
    }

    impl Error for ParseError {
        fn source(&self) -> Option<&(dyn Error + 'static)> {
            match self {
                ParseError::Invalid => None,
                ParseError::MissingScheme => None,
                ParseError::MissingField(_) => None,
                ParseError::ToStrError(err) => Some(err),
                ParseError::Base64DecodeError(err) => Some(err),
                ParseError::Utf8Error(err) => Some(err),
            }
        }
    }

    impl From<header::ToStrError> for ParseError {
        fn from(err: header::ToStrError) -> Self {
            ParseError::ToStrError(err)
        }
    }

    impl From<base64::DecodeError> for ParseError {
        fn from(err: base64::DecodeError) -> Self {
            ParseError::Base64DecodeError(err)
        }
    }

    impl From<str::Utf8Error> for ParseError {
        fn from(err: str::Utf8Error) -> Self {
            ParseError::Utf8Error(err)
        }
    }