68 lines
2.0 KiB
Rust
68 lines
2.0 KiB
Rust
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use std::io::Read;
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use std::path::PathBuf;
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use mailparse::{MailHeader, parse_mail};
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use libimagref::hasher::Hasher;
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use libimagref::hasher::DefaultHasher;
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use libimagref::error::RefErrorKind as REK;
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use libimagref::error::MapErrInto;
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use libimagref::result::Result as RResult;
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use libimagerror::into::IntoError;
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use error::MailErrorKind as MEK;
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pub struct MailHasher {
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defaulthasher: DefaultHasher,
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}
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impl MailHasher {
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pub fn new() -> MailHasher {
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MailHasher { defaulthasher: DefaultHasher::new() }
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}
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}
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impl Hasher for MailHasher {
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fn hash_name(&self) -> &'static str {
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"default_mail_hasher"
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}
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fn create_hash<R: Read>(&mut self, pb: &PathBuf, c: &mut R) -> RResult<String> {
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use filters::filter::Filter;
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let mut s = String::new();
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try!(c.read_to_string(&mut s).map_err_into(REK::UTF8Error).map_err_into(REK::IOError));
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parse_mail(&s.as_bytes())
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.map_err(Box::new)
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.map_err(|e| MEK::MailParsingError.into_error_with_cause(e))
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.map_err_into(REK::RefHashingError)
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.and_then(|mail| {
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let has_key = |hdr: &MailHeader, exp: &str|
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hdr.get_key().map(|s| s == exp).unwrap_or(false);
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let subject_filter = |hdr: &MailHeader| has_key(hdr, "Subject");
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let from_filter = |hdr: &MailHeader| has_key(hdr, "From");
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let to_filter = |hdr: &MailHeader| has_key(hdr, "To");
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let filter = subject_filter.or(from_filter).or(to_filter);
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let mut v = vec![];
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for hdr in mail.headers.iter().filter(|item| filter.filter(item)) {
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let s = try!(hdr.get_value()
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.map_err(Box::new)
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.map_err(|e| REK::RefHashingError.into_error_with_cause(e)));
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v.push(s);
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}
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let s : String = v.join("");
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self.defaulthasher.create_hash(pb, &mut s.as_bytes())
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})
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}
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}
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