meli/melib/README.md

melib

Library for handling mail.

optional features

feature flag	dependencies	notes
imap_backend	native-tls
deflate_compression	flate2	for use with IMAP
jmap_backend	isahc, native-tls, serde_json
maildir_backend	notify
mbox_backend	notify
notmuch_backend	notify
sqlite	rusqlite	used in IMAP cache
unicode_algorithms	unicode-segmentation	linebreaking algo etc
vcard		vcard parsing
gpgme		GPG use with libgpgme
smtp	native-tls, base64	async SMTP communication

Example: Parsing bytes into an Envelope

An Envelope represents the information you can get from an email's headers and body structure. Addresses in To, From fields etc are parsed into Address types.

use melib::{Attachment, Envelope};

let raw_mail = r#"From: "some name" <some@example.com>
To: "me" <myself@example.com>
Cc:
Subject: =?utf-8?Q?gratuitously_encoded_subject?=
Message-ID: <h2g7f.z0gy2pgaen5m@example.com>
MIME-Version: 1.0
Content-Type: multipart/mixed; charset="utf-8";
 boundary="bzz_bzz__bzz__"

This is a MIME formatted message with attachments. Use a MIME-compliant client to view it properly.
--bzz_bzz__bzz__

hello world.
--bzz_bzz__bzz__
Content-Type: image/gif; name="test_image.gif"; charset="utf-8"
Content-Disposition: attachment
Content-Transfer-Encoding: base64
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--bzz_bzz__bzz__--"#;

let envelope = Envelope::from_bytes(raw_mail.as_bytes(), None).expect("Could not parse mail");
assert_eq!(envelope.subject().as_ref(), "gratuitously encoded subject");
assert_eq!(envelope.message_id_display().as_ref(), "<h2g7f.z0gy2pgaen5m@example.com>");

let body = envelope.body_bytes(raw_mail.as_bytes());
assert_eq!(body.content_type().to_string().as_str(), "multipart/mixed");

let body_text = body.text();
assert_eq!(body_text.as_str(), "hello world.");

let subattachments: Vec<Attachment> = body.attachments();
assert_eq!(subattachments.len(), 3);
assert_eq!(subattachments[2].content_type().name().unwrap(), "test_image.gif");