use crate::{
AddressList, AuthenticationResults, Header, Mailbox, MailboxList, MessageID, MimeParameters,
Result, SharedString,
};
use chrono::{DateTime, FixedOffset, TimeZone};
use paste::paste;
#[derive(Debug, Clone, Default, PartialEq)]
pub struct HeaderMap<'a> {
pub(crate) headers: Vec<Header<'a>>,
}
impl<'a> std::ops::Deref for HeaderMap<'a> {
type Target = Vec<Header<'a>>;
fn deref(&self) -> &Vec<Header<'a>> {
&self.headers
}
}
impl<'a> std::ops::DerefMut for HeaderMap<'a> {
fn deref_mut(&mut self) -> &mut Vec<Header<'a>> {
&mut self.headers
}
}
pub trait EncodeHeaderValue {
fn encode_value(&self) -> SharedString<'static>;
fn as_header(&self, _name: &str) -> Option<Header<'static>> {
None
}
}
impl EncodeHeaderValue for &str {
fn encode_value(&self) -> SharedString<'static> {
unimplemented!();
}
fn as_header(&self, name: &str) -> Option<Header<'static>> {
Some(Header::new_unstructured(name.to_string(), self.to_string()))
}
}
impl<T: TimeZone> EncodeHeaderValue for DateTime<T>
where
<T as TimeZone>::Offset: std::fmt::Display,
{
fn encode_value(&self) -> SharedString<'static> {
(*self).to_rfc2822().into()
}
}
macro_rules! accessor {
($func_name:ident, $header_name:literal, $ty:path, $parser:ident) => {
pub fn $func_name(&self) -> Result<Option<$ty>> {
match self.get_first($header_name) {
None => Ok(None),
Some(header) => Ok(Some(header.$parser()?)),
}
}
paste! {
pub fn [<set_ $func_name>](&mut self, v: impl EncodeHeaderValue) {
if let Some(idx) = self
.headers
.iter()
.position(|header| header.get_name().eq_ignore_ascii_case($header_name))
{
if let Some(hdr) = v.as_header(self.headers[idx].get_name()) {
self.headers[idx] = hdr;
} else {
self.headers[idx].assign(v);
}
} else {
if let Some(hdr) = v.as_header($header_name) {
self.headers.push(hdr);
} else {
self.headers
.push(Header::with_name_value($header_name, v.encode_value()));
}
}
}
}
};
}
impl<'a> HeaderMap<'a> {
pub fn new(headers: Vec<Header<'a>>) -> Self {
Self { headers }
}
pub fn remove_all_named(&mut self, name: &str) {
self.headers
.retain(|hdr| !hdr.get_name().eq_ignore_ascii_case(name));
}
pub fn prepend<V: Into<SharedString<'a>>>(&mut self, name: &str, v: V) {
self.headers
.insert(0, Header::new_unstructured(name.to_string(), v));
}
pub fn get_first(&'a self, name: &str) -> Option<&Header<'a>> {
self.iter_named(name).next()
}
pub fn get_first_mut(&'a mut self, name: &str) -> Option<&mut Header<'a>> {
self.iter_named_mut(name).next()
}
pub fn get_last(&'a self, name: &str) -> Option<&Header<'a>> {
self.iter_named(name).rev().next()
}
pub fn get_last_mut(&'a mut self, name: &str) -> Option<&mut Header<'a>> {
self.iter_named_mut(name).rev().next()
}
pub fn iter_named<'name>(
&'a self,
name: &'name str,
) -> impl DoubleEndedIterator<Item = &'a Header<'a>> + 'name
where
'a: 'name,
{
self.headers
.iter()
.filter(|header| header.get_name().eq_ignore_ascii_case(name))
}
pub fn iter_named_mut<'name>(
&'a mut self,
name: &'name str,
) -> impl DoubleEndedIterator<Item = &'a mut Header<'a>> + 'name
where
'a: 'name,
{
self.headers
.iter_mut()
.filter(|header| header.get_name().eq_ignore_ascii_case(name))
}
accessor!(from, "From", MailboxList, as_mailbox_list);
accessor!(resent_from, "Resent-From", MailboxList, as_mailbox_list);
accessor!(to, "To", AddressList, as_address_list);
accessor!(reply_to, "Reply-To", AddressList, as_address_list);
accessor!(cc, "Cc", AddressList, as_address_list);
accessor!(bcc, "Bcc", AddressList, as_address_list);
accessor!(resent_to, "Resent-To", AddressList, as_address_list);
accessor!(resent_cc, "Resent-Cc", AddressList, as_address_list);
accessor!(resent_bcc, "Resent-Bcc", AddressList, as_address_list);
accessor!(date, "Date", DateTime<FixedOffset>, as_date);
accessor!(sender, "Sender", Mailbox, as_mailbox);
accessor!(resent_sender, "Resent-Sender", Mailbox, as_mailbox);
accessor!(message_id, "Message-ID", MessageID, as_message_id);
accessor!(content_id, "Content-ID", MessageID, as_content_id);
accessor!(references, "References", Vec<MessageID>, as_message_id_list);
accessor!(subject, "Subject", String, as_unstructured);
accessor!(comments, "Comments", String, as_unstructured);
accessor!(
content_transfer_encoding,
"Content-Transfer-Encoding",
MimeParameters,
as_content_transfer_encoding
);
accessor!(mime_version, "Mime-Version", String, as_unstructured);
accessor!(
content_disposition,
"Content-Disposition",
MimeParameters,
as_content_disposition
);
accessor!(
content_type,
"Content-Type",
MimeParameters,
as_content_type
);
accessor!(
authentication_results,
"Authentication-Results",
AuthenticationResults,
as_authentication_results
);
}