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use self::Error::*;
use base64::DecodeError;
use native_tls;
use nom;
use smtp::response::{Response, Severity};
use std::error::Error as StdError;
use std::fmt;
use std::fmt::{Display, Formatter};
use std::io;
use std::string::FromUtf8Error;
#[derive(Debug)]
pub enum Error {
Transient(Response),
Permanent(Response),
ResponseParsing(&'static str),
ChallengeParsing(DecodeError),
Utf8Parsing(FromUtf8Error),
Client(&'static str),
Resolution,
Io(io::Error),
Tls(native_tls::Error),
Parsing(nom::ErrorKind),
}
impl Display for Error {
fn fmt(&self, fmt: &mut Formatter) -> Result<(), fmt::Error> {
match *self {
Transient(ref err) => fmt.write_str(match err.first_line() {
Some(line) => line,
None => "transient error during SMTP transaction",
}),
Permanent(ref err) => fmt.write_str(match err.first_line() {
Some(line) => line,
None => "permanent error during SMTP transaction",
}),
ResponseParsing(err) => fmt.write_str(err),
ChallengeParsing(ref err) => err.fmt(fmt),
Utf8Parsing(ref err) => err.fmt(fmt),
Resolution => fmt.write_str("could not resolve hostname"),
Client(err) => fmt.write_str(err),
Io(ref err) => err.fmt(fmt),
Tls(ref err) => err.fmt(fmt),
Parsing(ref err) => fmt.write_str(err.description()),
}
}
}
impl StdError for Error {
fn cause(&self) -> Option<&dyn StdError> {
match *self {
ChallengeParsing(ref err) => Some(&*err),
Utf8Parsing(ref err) => Some(&*err),
Io(ref err) => Some(&*err),
Tls(ref err) => Some(&*err),
_ => None,
}
}
}
impl From<io::Error> for Error {
fn from(err: io::Error) -> Error {
Io(err)
}
}
impl From<native_tls::Error> for Error {
fn from(err: native_tls::Error) -> Error {
Tls(err)
}
}
impl From<nom::ErrorKind> for Error {
fn from(err: nom::ErrorKind) -> Error {
Parsing(err)
}
}
impl From<DecodeError> for Error {
fn from(err: DecodeError) -> Error {
ChallengeParsing(err)
}
}
impl From<FromUtf8Error> for Error {
fn from(err: FromUtf8Error) -> Error {
Utf8Parsing(err)
}
}
impl From<Response> for Error {
fn from(response: Response) -> Error {
match response.code.severity {
Severity::TransientNegativeCompletion => Transient(response),
Severity::PermanentNegativeCompletion => Permanent(response),
_ => Client("Unknown error code"),
}
}
}
impl From<&'static str> for Error {
fn from(string: &'static str) -> Error {
Client(string)
}
}
pub type SmtpResult = Result<Response, Error>;