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+// error.rs
+
+// *************************************************************************
+// * Copyright (C) 2017-2019 Daniel Mueller (deso@posteo.net) *
+// * *
+// * This program is free software: you can redistribute it and/or modify *
+// * it under the terms of the GNU General Public License as published by *
+// * the Free Software Foundation, either version 3 of the License, or *
+// * (at your option) any later version. *
+// * *
+// * This program is distributed in the hope that it will be useful, *
+// * but WITHOUT ANY WARRANTY; without even the implied warranty of *
+// * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
+// * GNU General Public License for more details. *
+// * *
+// * You should have received a copy of the GNU General Public License *
+// * along with this program. If not, see <http://www.gnu.org/licenses/>. *
+// *************************************************************************
+
+use std::fmt;
+use std::io;
+use std::str;
+use std::string;
+
+/// A trait used to simplify error handling in conjunction with the
+/// try_with_* functions we use for repeatedly asking the user for a
+/// secret.
+pub trait TryInto<T> {
+ fn try_into(self) -> Result<T, Error>;
+}
+
+impl<T, U> TryInto<U> for T
+where
+ T: Into<U>,
+{
+ fn try_into(self) -> Result<U, Error> {
+ Ok(self.into())
+ }
+}
+
+#[derive(Debug)]
+pub enum Error {
+ ArgparseError(i32),
+ IoError(io::Error),
+ NitrokeyError(Option<&'static str>, nitrokey::Error),
+ Utf8Error(str::Utf8Error),
+ Error(String),
+}
+
+impl TryInto<nitrokey::Error> for Error {
+ fn try_into(self) -> Result<nitrokey::Error, Error> {
+ match self {
+ Error::NitrokeyError(_, err) => Ok(err),
+ err => Err(err),
+ }
+ }
+}
+
+impl From<&str> for Error {
+ fn from(s: &str) -> Error {
+ Error::Error(s.to_string())
+ }
+}
+
+impl From<nitrokey::Error> for Error {
+ fn from(e: nitrokey::Error) -> Error {
+ Error::NitrokeyError(None, e)
+ }
+}
+
+impl From<io::Error> for Error {
+ fn from(e: io::Error) -> Error {
+ Error::IoError(e)
+ }
+}
+
+impl From<str::Utf8Error> for Error {
+ fn from(e: str::Utf8Error) -> Error {
+ Error::Utf8Error(e)
+ }
+}
+
+impl From<string::FromUtf8Error> for Error {
+ fn from(e: string::FromUtf8Error) -> Error {
+ Error::Utf8Error(e.utf8_error())
+ }
+}
+
+impl fmt::Display for Error {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ match *self {
+ Error::ArgparseError(_) => write!(f, "Could not parse arguments"),
+ Error::NitrokeyError(ref ctx, ref e) => {
+ if let Some(ctx) = ctx {
+ write!(f, "{}: ", ctx)?;
+ }
+ write!(f, "{}", e)
+ }
+ Error::Utf8Error(_) => write!(f, "Encountered UTF-8 conversion error"),
+ Error::IoError(ref e) => write!(f, "IO error: {}", e),
+ Error::Error(ref e) => write!(f, "{}", e),
+ }
+ }
+}