1 files changed, 64 insertions, 0 deletions
diff --git a/lib/domain/libimagmail/src/util.rs b/lib/domain/libimagmail/src/util.rs
new file mode 100644
index 00000000..8b51a9f8
--- /dev/null
+++ b/lib/domain/libimagmail/src/util.rs
@@ -0,0 +1,64 @@
+//
+// imag - the personal information management suite for the commandline
+// Copyright (C) 2015-2019 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::path::Path;
+
+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> {
+    ::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" {
+                Some(Ok(hdr))
+            } else {
+                None
+            }
+        })
+        .next()
+        .ok_or_else(|| format_err!("Message Id not found in {}", p.as_ref().display()))?
+        .and_then(|hdr| hdr.get_value().map_err(Error::from))
+        .map(strip_message_delimiters)
+}
+
+/// Strips message delimiters ('<' and '>') from a Message-ID field.
+pub(crate) fn strip_message_delimiters<ID: AsRef<str>>(id: ID) -> String {
+    let len  = id.as_ref().len();
+    // We have to strip the '<' and '>' if there are any, because they do not belong to the
+    // Message-Id at all
+    id.as_ref()
+        .chars()
+        .enumerate()
+        .filter(|(idx, chr)| !(*idx == 0 && *chr == '<' || *idx == len - 1 && *chr == '>'))
+        .map(|tpl| tpl.1)
+        .collect()
+}
+
+pub fn get_mail_text_content<P: AsRef<Path>>(p: P) -> 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()))?
+        .get_body()
+        .map_err(Error::from)
+}
+