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use std::path::Path;
use std::fs::File;
use std::io::Read;
use std::fs::OpenOptions;
use libimagstore::store::Store;
use libimagstore::storeid::StoreId;
use libimagstore::store::FileLockEntry;
use libimagentryref::reference::Ref;
use libimagentryref::refstore::RefStore;
use libimagentryref::refstore::UniqueRefPathGenerator;
use libimagerror::errors::ErrorMsg as EM;
use email::MimeMessage;
use email::results::ParsingResult as EmailParsingResult;
use failure::Fallible as Result;
use failure::ResultExt;
use failure::Error;
use failure::err_msg;
struct UniqueMailRefGenerator;
impl UniqueRefPathGenerator for UniqueMailRefGenerator {
fn collection() -> &'static str {
"mail"
}
fn unique_hash<A: AsRef<Path>>(path: A) -> Result<String> {
use filters::filter::Filter;
use email::Header;
let mut s = String::new();
let _ = OpenOptions::new()
.read(true)
.write(false)
.create(false)
.open(path)?
.read_to_string(&mut s)?;
MimeMessage::parse(&s)
.context(err_msg("Error creating ref"))
.map_err(Error::from)
.and_then(|mail| {
let has_key = |hdr: &Header, exp: &str| hdr.name == exp;
let subject_filter = |hdr: &Header| has_key(hdr, "Subject");
let from_filter = |hdr: &Header| has_key(hdr, "From");
let to_filter = |hdr: &Header| has_key(hdr, "To");
let filter = subject_filter.or(from_filter).or(to_filter);
let mut v : Vec<String> = vec![];
for hdr in mail.headers.iter().filter(|item| filter.filter(item)) {
let s = hdr
.get_value()
.context(err_msg("Ref creation error"))?;
v.push(s);
}
let s : String = v.join("");
Ok(s)
})
}
fn postprocess_storeid(sid: StoreId) -> Result<StoreId> {
Ok(sid)
}
}
struct Buffer(String);
impl Buffer {
pub fn parsed(&self) -> EmailParsingResult<MimeMessage> {
MimeMessage::parse(&self.0)
}
}
impl From<String> for Buffer {
fn from(data: String) -> Buffer {
Buffer(data)
}
}
pub struct Mail<'a>(FileLockEntry<'a>, Buffer);
impl<'a> Mail<'a> {
pub fn import_from_path<P: AsRef<Path>>(store: &Store, p: P) -> Result<Mail> {
debug!("Importing Mail from path");
store.retrieve_ref::<UniqueMailRefGenerator, P>(p)
.and_then(|reference| {
debug!("Build reference file: {:?}", reference);
reference.get_path()
.context(err_msg("Ref handling error"))
.map_err(Error::from)
.and_then(|path| File::open(path).context(EM::IO).map_err(Error::from))
.and_then(|mut file| {
let mut s = String::new();
file.read_to_string(&mut s)
.map(|_| s)
.context(EM::IO)
.map_err(Error::from)
})
.map(Buffer::from)
.map(|buffer| Mail(reference, buffer))
})
}
pub fn open<S: AsRef<str>>(store: &Store, hash: S) -> Result<Option<Mail>> {
debug!("Opening Mail by Hash");
store.get_ref::<UniqueMailRefGenerator, S>(hash)
.context(err_msg("Fetch by hash error"))
.context(err_msg("Fetch error"))
.map_err(Error::from)
.and_then(|o| match o {
Some(r) => Mail::from_fle(r).map(Some),
None => Ok(None),
})
}
pub fn from_fle(fle: FileLockEntry<'a>) -> Result<Mail<'a>> {
fle.get_path()
.context(err_msg("Ref handling error"))
.map_err(Error::from)
.and_then(|path| File::open(path).context(EM::IO).map_err(Error::from))
.and_then(|mut file| {
let mut s = String::new();
file.read_to_string(&mut s)
.map(|_| s)
.context(EM::IO)
.map_err(Error::from)
})
.map(Buffer::from)
.map(|buffer| Mail(fle, buffer))
}
pub fn get_field(&self, field: &str) -> Result<Option<String>> {
debug!("Getting field in mail: {:?}", field);
self.1
.parsed()
.context(err_msg("Mail parsing error"))
.map_err(Error::from)
.map(|parsed| {
parsed.headers
.iter()
.filter(|hdr| hdr.name == field)
.nth(0)
.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")
}
pub fn fle(&self) -> &FileLockEntry<'a> {
&self.0
}
}