1 files changed, 87 insertions, 0 deletions
diff --git a/lib/domain/libimagmail/src/hasher.rs b/lib/domain/libimagmail/src/hasher.rs
new file mode 100644
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+++ b/lib/domain/libimagmail/src/hasher.rs
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+//
+// imag - the personal information management suite for the commandline
+// Copyright (C) 2015, 2016 Matthias Beyer <mail@beyermatthias.de> and contributors
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; version
+// 2.1 of the License.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+//
+
+use std::io::Read;
+use std::path::PathBuf;
+
+use email::MimeMessage;
+
+use libimagref::hasher::Hasher;
+use libimagref::hasher::DefaultHasher;
+use libimagref::error::RefErrorKind as REK;
+use libimagref::error::MapErrInto;
+use libimagref::result::Result as RResult;
+use libimagerror::into::IntoError;
+
+use error::MailErrorKind as MEK;
+
+pub struct MailHasher {
+    defaulthasher: DefaultHasher,
+}
+
+impl MailHasher {
+
+    pub fn new() -> MailHasher {
+        MailHasher { defaulthasher: DefaultHasher::new() }
+    }
+
+}
+
+impl Hasher for MailHasher {
+
+    fn hash_name(&self) -> &'static str {
+        "default_mail_hasher"
+    }
+
+    fn create_hash<R: Read>(&mut self, pb: &PathBuf, c: &mut R) -> RResult<String> {
+        use filters::filter::Filter;
+        use email::Header;
+
+        let mut s = String::new();
+        try!(c.read_to_string(&mut s).map_err_into(REK::UTF8Error).map_err_into(REK::IOError));
+
+        MimeMessage::parse(&s)
+            .map_err(Box::new)
+            .map_err(|e| MEK::MailParsingError.into_error_with_cause(e))
+            .map_err_into(REK::RefHashingError)
+            .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 = try!(hdr
+                        .get_value()
+                        .map_err(Box::new)
+                        .map_err(|e| REK::RefHashingError.into_error_with_cause(e)));
+
+                    v.push(s);
+                }
+                let s : String = v.join("");
+
+                self.defaulthasher.create_hash(pb, &mut s.as_bytes())
+            })
+    }
+
+}