This project aims to provide a proper strongly typed way to build and parse emails.
hyper::HeaderThe easiest way how we can create email message with simple string (see format_string.rs).
```rust extern crate emailmessage;
use emailmessage::{header, Message};
fn main() {
let m: Message
println!("{}", m);
} ```
Run this example:
``` $ cargo run --example format_string
From: NoBody nobody@domain.tld Reply-To: Yuin yuin@domain.tld To: Hei hei@domain.tld Subject: Happy new year
Be happy! ```
The unicode header data will be encoded using UTF8-Base64 encoding.
The more complex way is using MIME contents (see format_mime.rs).
```rust extern crate emailmessage;
use emailmessage::{header, Message, SinglePart};
fn main() {
let m: Message
println!("{}", m);
} ```
The body will be encoded using selected Content-Transfer-Encoding.
``` $ cargo run --example format_mime
From: NoBody nobody@domain.tld Reply-To: Yuin yuin@domain.tld To: Hei hei@domain.tld Subject: Happy new year MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: quoted-printable
=D0=9F=D1=80=D0=B8=D0=B2=D0=B5=D1=82, =D0=BC=D0=B8=D1=80!
```
And the more advanced way is a using multipart MIME contents (see format_multipart.rs).
```rust extern crate emailmessage;
use emailmessage::{header, Message, SinglePart, MultiPart};
fn main() {
let m: Message Hello, world! 
println!("{}", m);
} ```
``` $ cargo run --example format_multipart
From: NoBody nobody@domain.tld Reply-To: Yuin yuin@domain.tld To: Hei hei@domain.tld Subject: Happy new year MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="RTxPCn9p31oAAAAAeQxtr1FbXr/i5vW1hFlH9oJqZRMWxRMK1QLjQ4OPqFk9R+0xUb/m"
--RTxPCn9p31oAAAAAeQxtr1FbXr/i5vW1hFlH9oJqZRMWxRMK1QLjQ4OPqFk9R+0xUb/m Content-Type: multipart/alternative; boundary="qW9QCn9p31oAAAAAodFBg1L1Qrraa5hEl0bDJ6kfJMUcRT2LLSWEoeyhSEbUBIqbjWqy"
--qW9QCn9p31oAAAAAodFBg1L1Qrraa5hEl0bDJ6kfJMUcRT2LLSWEoeyhSEbUBIqbjWqy Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf8
=D0=9F=D1=80=D0=B8=D0=B2=D0=B5=D1=82, =D0=BC=D0=B8=D1=80! --qW9QCn9p31oAAAAAodFBg1L1Qrraa5hEl0bDJ6kfJMUcRT2LLSWEoeyhSEbUBIqbjWqy Content-Type: multipart/related; boundary="BV5RCn9p31oAAAAAUt42E9bYMDEAGCOWlxEz89Bv0qFA5Xsy6rOC3zRahMQ39IFZNnp8"
--BV5RCn9p31oAAAAAUt42E9bYMDEAGCOWlxEz89Bv0qFA5Xsy6rOC3zRahMQ39IFZNnp8 Content-Transfer-Encoding: 8bit Content-Type: text/html; charset=utf8
Hello, world!
--BV5RCn9p31oAAAAAUt42E9bYMDEAGCOWlxEz89Bv0qFA5Xsy6rOC3zRahMQ39IFZNnp8 Content-Transfer-Encoding: base64 Content-Type: image/png Content-Disposition: inline
PHNtaWxlLXJhdy1pbWFnZS1kYXRhPg== --BV5RCn9p31oAAAAAUt42E9bYMDEAGCOWlxEz89Bv0qFA5Xsy6rOC3zRahMQ39IFZNnp8-- --qW9QCn9p31oAAAAAodFBg1L1Qrraa5hEl0bDJ6kfJMUcRT2LLSWEoeyhSEbUBIqbjWqy-- --RTxPCn9p31oAAAAAeQxtr1FbXr/i5vW1hFlH9oJqZRMWxRMK1QLjQ4OPqFk9R+0xUb/m Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=utf8 Content-Disposition: attachment; filename="example.c"
int main() { return 0; } --RTxPCn9p31oAAAAAeQxtr1FbXr/i5vW1hFlH9oJqZRMWxRMK1QLjQ4OPqFk9R+0xUb/m--
```
The RAM-efficient way to formatting ans sending relatively big emails is a using streaming. For example, you would like to send server access logs in attachments, HTML-documents with related media resources or PDFs.
In examples above we actually allocated formatted emails in memory, but usually we don't want to do same for big emails which size measures in MBytes.
The simple example below shows actually sent chunks of streamed message (see format_stream.rs).
```rust extern crate futures; extern crate tokio_core; extern crate emailmessage;
use std::str::fromutf8; use futures::{Stream}; use tokiocore::reactor::{Core}; use emailmessage::{header, Message, BinaryStream};
fn main() { let mut core = Core::new().unwrap();
let m: Message = Message::new()
.with_header(header::From(vec!["NoBody <nobody@domain.tld>".parse().unwrap()]))
.with_header(header::ReplyTo(vec!["Yuin <yuin@domain.tld>".parse().unwrap()]))
.with_header(header::To(vec!["Hei <hei@domain.tld>".parse().unwrap()]))
.with_header(header::Subject("Happy new year".into()))
.with_body("\r\nBe happy!");
let f = Into::<Box<BinaryStream<_>>>::into(m).map(|chunk| {
println!("CHUNK[[\n{}]]", from_utf8(&chunk).unwrap());
chunk
}).concat2();
core.run(f).unwrap();
} ```
``` $ cargo run --example format_stream
CHUNK[[ From: NoBody nobody@domain.tld Reply-To: Yuin yuin@domain.tld To: Hei hei@domain.tld Subject: Happy new year ]] CHUNK[[
Be happy!]] ```
In real world app we may do some buffering of stream to prevent too short and too long sendings.
(see format_stream_multipart.rs)
```rust extern crate futures; extern crate tokio_core; extern crate emailmessage;
use std::str::fromutf8; use futures::{Stream}; use tokiocore::reactor::{Core}; use emailmessage::{header, Message, SinglePart, MultiPart, EncodedBinaryStream};
fn main() { let mut core = Core::new().unwrap();
let b: MultiPart = MultiPart::mixed()
.with_multipart(
MultiPart::alternative()
.with_singlepart(
SinglePart::quoted_printable()
.with_header(header::ContentType("text/plain; charset=utf8".parse().unwrap()))
.with_body("Привет, мир!")
)
.with_multipart(
MultiPart::related()
.with_singlepart(
SinglePart::eight_bit()
.with_header(header::ContentType("text/html; charset=utf8".parse().unwrap()))
.with_body("<p><b>Hello</b>, <i>world</i>! <img src=smile.png></p>")
)
.with_singlepart(
SinglePart::base64()
.with_header(header::ContentType("image/png".parse().unwrap()))
.with_header(header::ContentDisposition {
disposition: header::DispositionType::Inline,
parameters: vec![],
})
.with_body("<smile-raw-image-data>")
)
)
)
.with_singlepart(
SinglePart::seven_bit()
.with_header(header::ContentType("text/plain; charset=utf8".parse().unwrap()))
.with_header(header::ContentDisposition {
disposition: header::DispositionType::Attachment,
parameters: vec![
header::DispositionParam::Filename(
header::Charset::Ext("utf-8".into()),
None, "example.c".as_bytes().into()
)
]
})
.with_body(String::from("int main() { return 0; }"))
);
let m: Message<Box<EncodedBinaryStream<_>>> = Message::new()
.with_header(header::From(vec!["NoBody <nobody@domain.tld>".parse().unwrap()]))
.with_header(header::ReplyTo(vec!["Yuin <yuin@domain.tld>".parse().unwrap()]))
.with_header(header::To(vec!["Hei <hei@domain.tld>".parse().unwrap()]))
.with_header(header::Subject("Happy new year".into()))
.with_header(header::MIME_VERSION_1_0)
.with_body(b);
let f = Into::<Box<EncodedBinaryStream<_>>>::into(m).map(|chunk| {
println!("CHUNK[[\n{}]]", from_utf8(&chunk).unwrap());
chunk
}).concat2();
core.run(f).unwrap();
} ```
``` $ cargo run --example formatstreammultipart
CHUNK[[ From: NoBody nobody@domain.tld Reply-To: Yuin yuin@domain.tld To: Hei hei@domain.tld Subject: Happy new year MIME-Version: 1.0 ]] CHUNK[[ Content-Type: multipart/mixed; boundary="1S8dCMR/31oAAAAApHRNMETjK2uRsQs4mVVFKVNujcqnm8FHOXWvqARiaYy9ZmnpQ7uQ" ]] CHUNK[[ --1S8dCMR/31oAAAAApHRNMETjK2uRsQs4mVVFKVNujcqnm8FHOXWvqARiaYy9ZmnpQ7uQ ]] CHUNK[[ --1S8dCMR/31oAAAAApHRNMETjK2uRsQs4mVVFKVNujcqnm8FHOXWvqARiaYy9ZmnpQ7uQ ]] CHUNK[[ Content-Type: multipart/alternative; boundary="TCMeCMR/31oAAAAAmf7KBuXt4qRk2RnBJCj8YJNdwm2dsadXxjOlC74hlb1tO6U/SqXY" ]] CHUNK[[ --TCMeCMR/31oAAAAAmf7KBuXt4qRk2RnBJCj8YJNdwm2dsadXxjOlC74hlb1tO6U/SqXY ]] CHUNK[[ --TCMeCMR/31oAAAAAmf7KBuXt4qRk2RnBJCj8YJNdwm2dsadXxjOlC74hlb1tO6U/SqXY ]] CHUNK[[ Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf8 ]] CHUNK[[ =D0=9F=D1=80=D0=B8=D0=B2=D0=B5=D1=82, =D0=BC=D0=B8=D1=80!]] CHUNK[[ ]] CHUNK[[ --TCMeCMR/31oAAAAAmf7KBuXt4qRk2RnBJCj8YJNdwm2dsadXxjOlC74hlb1tO6U/SqXY ]] CHUNK[[ Content-Type: multipart/related; boundary="YsgeCMR/31oAAAAAanzeyu/dFJGjfzDxpsAOLhRB0RfSw+DXefQybZxGq6HIBEzotZ5Y" ]] CHUNK[[ --YsgeCMR/31oAAAAAanzeyu/dFJGjfzDxpsAOLhRB0RfSw+DXefQybZxGq6HIBEzotZ5Y ]] CHUNK[[ --YsgeCMR/31oAAAAAanzeyu/dFJGjfzDxpsAOLhRB0RfSw+DXefQybZxGq6HIBEzotZ5Y ]] CHUNK[[ Content-Transfer-Encoding: 8bit Content-Type: text/html; charset=utf8 ]] CHUNK[[
Hello, world!
]] CHUNK[[ PHNtaWxlLXJhdy1pbWFnZS1kYXRhPg==]] CHUNK[[
]] CHUNK[[ --YsgeCMR/31oAAAAAanzeyu/dFJGjfzDxpsAOLhRB0RfSw+DXefQybZxGq6HIBEzotZ5Y-- ]] CHUNK[[ --TCMeCMR/31oAAAAAmf7KBuXt4qRk2RnBJCj8YJNdwm2dsadXxjOlC74hlb1tO6U/SqXY-- ]] CHUNK[[ --1S8dCMR/31oAAAAApHRNMETjK2uRsQs4mVVFKVNujcqnm8FHOXWvqARiaYy9ZmnpQ7uQ ]] CHUNK[[ Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=utf8 Content-Disposition: attachment; filename="example.c"
]] CHUNK[[ int main() { return 0; }]] CHUNK[[
]] CHUNK[[ --1S8dCMR/31oAAAAApHRNMETjK2uRsQs4mVVFKVNujcqnm8FHOXWvqARiaYy9ZmnpQ7uQ-- ]] ```