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use std::result::Result as RResult;
use std::path::Path;
use std::path::PathBuf;
use std::fs::File;
use std::io::Read;
use libimagstore::store::{FileLockEntry, Store};
use libimagref::reference::Ref;
use libimagref::flags::RefFlags;
use mailparse::{MailParseError, ParsedMail, parse_mail};
use hasher::MailHasher;
use result::Result;
use error::{MapErrInto, MailErrorKind as MEK};
struct Buffer(String);
impl Buffer {
pub fn parsed<'a>(&'a self) -> RResult<ParsedMail<'a>, MailParseError> {
parse_mail(self.0.as_bytes())
}
}
impl From<String> for Buffer {
fn from(data: String) -> Buffer {
Buffer(data)
}
}
pub struct Mail<'a>(Ref<'a>, Buffer);
impl<'a> Mail<'a> {
/// Imports a mail from the Path passed
pub fn import_from_path<P: AsRef<Path>>(store: &Store, p: P) -> Result<Mail> {
let h = MailHasher::new();
let f = RefFlags::default().with_content_hashing(true).with_permission_tracking(false);
let p = PathBuf::from(p.as_ref());
Ref::create_with_hasher(store, p, f, h)
.map_err_into(MEK::RefCreationError)
.and_then(|reference| {
reference.fs_file()
.map_err_into(MEK::RefHandlingError)
.and_then(|path| File::open(path).map_err_into(MEK::IOError))
.and_then(|mut file| {
let mut s = String::new();
file.read_to_string(&mut s)
.map(|_| s)
.map_err_into(MEK::IOError)
})
.map(Buffer::from)
.map(|buffer| Mail(reference, buffer))
})
}
/// Opens a mail by the passed hash
pub fn open<S: AsRef<str>>(store: &Store, hash: S) -> Result<Option<Mail>> {
Ref::get_by_hash(store, String::from(hash.as_ref()))
.map_err_into(MEK::FetchByHashError)
.map_err_into(MEK::FetchError)
.and_then(|o| match o {
Some(r) => Mail::from_ref(r).map(Some),
None => Ok(None),
})
}
/// Implement me as TryFrom as soon as it is stable
pub fn from_ref(r: Ref<'a>) -> Result<Mail> {
r.fs_file()
.map_err_into(MEK::RefHandlingError)
.and_then(|path| File::open(path).map_err_into(MEK::IOError))
.and_then(|mut file| {
let mut s = String::new();
file.read_to_string(&mut s)
.map(|_| s)
.map_err_into(MEK::IOError)
})
.map(Buffer::from)
.map(|buffer| Mail(r, buffer))
}
pub fn get_field(&self, field: &str) -> Result<Option<String>> {
use mailparse::MailHeader;
self.1
.parsed()
.map_err_into(MEK::MailParsingError)
.map(|parsed| {
parsed.headers
.iter()
.filter(|hdr| hdr.get_key().map(|n| n == field).unwrap_or(false))
.next()
.and_then(|field| field.get_value().ok())
})
}
pub fn get_from(&self) -> Result<Option<String>> {
self.get_field("From")
}
pub fn get_to(&self) -> Result<Option<String>> {
self.get_field("To")
}
pub fn get_subject(&self) -> Result<Option<String>> {
self.get_field("Subject")
}
pub fn get_message_id(&self) -> Result<Option<String>> {
self.get_field("Message-ID")
}
pub fn get_in_reply_to(&self) -> Result<Option<String>> {
self.get_field("In-Reply-To")
}
}
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