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//
// imag - the personal information management suite for the commandline
// Copyright (C) 2015-2020 Matthias Beyer <mail@beyermatthias.de> and contributors
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; version
// 2.1 of the License.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//
use std::path::Path;
use failure::Fallible as Result;
use libimagentryref::hasher::Hasher;
use libimagerror::errors::ErrorMsg;
use libimagentryref::hasher::sha1::Sha1Hasher;
pub struct MailHasher;
impl Hasher for MailHasher {
const NAME: &'static str = "MailHasher";
/// hash the file at path `path`
///
/// We create a sha1 over the path of the file (which is NOT safe, because mails can move) and
/// the Message-ID of the mail itself.
///
/// # TODO: Fix
///
/// The file name is not constant with mail files, because flags are encoded in the filename.
/// The path is not constant with mail files, because they can be moved between boxes.
fn hash<P: AsRef<Path>>(path: P) -> Result<String> {
let mut path_str = path
.as_ref()
.to_str()
.map(String::from)
.ok_or_else(|| ErrorMsg::UTF8Error)?;
let message_id : String = crate::util::get_message_id_for_mailfile(path)?.into();
path_str.push_str(&message_id);
Ok(Sha1Hasher::sha1_hash(path_str.as_bytes()))
}
}
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