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Add helper function to be more flexible

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Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
This commit is contained in:
Matthias Beyer 2019-02-22 11:31:49 +01:00
parent b2fbf1e462
commit 211d6fa60b
1 changed files with 18 additions and 4 deletions
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22
lib/domain/libimagmail/src/util.rs
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@ -23,23 +23,37 @@ use failure::Error;
use failure::Fallible as Result;
use failure::ResultExt;
pub(crate) fn get_message_id_for_mailfile<P: AsRef<Path>>(p: P) -> Result<String> {
/// Get the message header at a specific key
///
/// # WARNING
///
/// Key must be all-lowercase
///
/// # WARNING
///
/// Expensive, as mailfile gets read from disk internally.
/// TODO: Optimize
///
pub(crate) fn get_message_header_at_key<P: AsRef<Path>, K: AsRef<str>>(p: P, k: K) -> Result<String> {
::mailparse::parse_mail(::std::fs::read_to_string(p.as_ref())?.as_bytes())
.context(format_err!("Cannot parse Email {}", p.as_ref().display()))?
.headers
.into_iter()
.filter_map(|hdr| match hdr.get_key() {
Err(e) => Some(Err(e).map_err(Error::from)),
Ok(k) => if k.to_lowercase() == "message-id" {
Ok(k) => if k.to_lowercase() == k.as_ref() {
Some(Ok(hdr))
} else {
None
}
})
.next()
.ok_or_else(|| format_err!("Message Id not found in {}", p.as_ref().display()))?
.ok_or_else(|| format_err!("'{}' not found in {}", k.as_ref(), p.as_ref().display()))?
.and_then(|hdr| hdr.get_value().map_err(Error::from))
.map(strip_message_delimiters)
}
pub(crate) fn get_message_id_for_mailfile<P: AsRef<Path>>(p: P) -> Result<String> {
get_message_header_at_key(p, "message-id").map(strip_message_delimiters)
}
/// Strips message delimiters ('<' and '>') from a Message-ID field.