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use chrono::DateTime;
use chrono::Utc;
use std::mem::replace;
#[cfg(feature="serde")]
use serde::{Serialize, Deserialize};
/// A struct representing common file metadata.
///
/// This is used by e.g. attachments, when attaching
/// a file (or embedding an image). Through it's usage
/// is optional.
///
/// # Stability Note
///
/// This is likely to move to an different place at
/// some point, potentially in a different `mail-*`
/// crate.
#[derive(Debug, Clone, Eq, PartialEq, Hash, Default)]
#[cfg_attr(feature="serde", derive(Serialize, Deserialize))]
pub struct FileMeta {
/// The file name.
///
/// Note that this utility is limited to utf-8 file names.
/// This is normally used when downloading a attachment to
/// choose the default file name.
#[cfg_attr(feature="serde", serde(default))]
pub file_name: Option<String>,
/// The creation date of the file (in utc).
#[cfg_attr(feature="serde", serde(default))]
#[cfg_attr(feature="serde", serde(with = "super::utils::serde::opt_date_time"))]
pub creation_date: Option<DateTime<Utc>>,
/// The last modification date of the file (in utc).
#[cfg_attr(feature="serde", serde(default))]
#[cfg_attr(feature="serde", serde(with = "super::utils::serde::opt_date_time"))]
pub modification_date: Option<DateTime<Utc>>,
/// The date time the file was read, i.e. placed in the mail (in utc).
#[cfg_attr(feature="serde", serde(default))]
#[cfg_attr(feature="serde", serde(with = "super::utils::serde::opt_date_time"))]
pub read_date: Option<DateTime<Utc>>,
/// The size the file should have.
///
/// Note that normally mail explicitly opts to NOT specify the size
/// of a mime-multi part body (e.g. an attachments) and you can never
/// rely on it to e.g. skip ahead. But it has some uses wrt. thinks
/// like external headers.
#[cfg_attr(feature="serde", serde(default))]
pub size: Option<usize>
}
macro_rules! impl_replace_none {
($self_:expr, $other:expr, [$($field:ident),*]) => ({
let &mut FileMeta {$(
ref mut $field
),*} = $self_;
$(
if $field.is_none() {
replace($field, $other.$field.clone());
}
)*
})
}
impl FileMeta {
/// Replaces all fields which are `None` with the value of the field in `other_meta`.
pub fn replace_empty_fields_with(&mut self, other_meta: &Self) {
impl_replace_none! {
self, other_meta,
[file_name, creation_date, modification_date, read_date, size]
}
}
}
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