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// Copyright 2020 The Tink-Rust Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
////////////////////////////////////////////////////////////////////////////////
//! Utilities for Tink Rust code.
//!
//! Some of these utilities are not idiomatic Rust, but are included to make the process of
//! translating code from other languages (e.g. Go) easier.
use std::error::Error;
/// `Error` type for errors emitted by Tink. Note that errors from cryptographic
/// operations are necessarily uninformative, to avoid information leakage.
#[derive(Debug)]
pub struct TinkError {
msg: String,
src: Option<Box<dyn Error>>,
}
impl TinkError {
pub fn new(msg: &str) -> Self {
msg.into()
}
}
impl std::fmt::Display for TinkError {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
if let Some(src) = &self.src {
write!(f, "{}: {}", self.msg, src)
} else {
write!(f, "{}", self.msg)
}
}
}
impl Error for TinkError {}
impl std::convert::From<&str> for TinkError {
fn from(msg: &str) -> Self {
TinkError {
msg: msg.to_string(),
src: None,
}
}
}
impl std::convert::From<String> for TinkError {
fn from(msg: String) -> Self {
TinkError { msg, src: None }
}
}
/// Wrap an error with an additional message. This utility is intended to help
/// with porting Go code to Rust, to cover patterns like:
///
/// ```Go
/// thing, err := FunctionCall()
/// if err != nil {
/// return nil, fmt.Errorf("FunctionCall failed: %s", err)
/// }
/// ```
pub fn wrap_err<T>(msg: &str, src: T) -> TinkError
where
T: Error + 'static,
{
TinkError {
msg: msg.to_string(),
src: Some(Box::new(src)),
}
}