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/*
* meli - attachments module
*
* Copyright 2017 Manos Pitsidianakis
*
* This file is part of meli.
*
* meli is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* meli 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with meli. If not, see <http://www.gnu.org/licenses/>.
*/
use data_encoding::BASE64_MIME;
use mailbox::email::parser;
use mailbox::email::parser::BytesExt;
use mailbox::email::EnvelopeWrapper;
use std::fmt;
use std::str;
pub use mailbox::email::attachment_types::*;
/*
*
* Data
* Text { content: Vec<u8> }
* Multipart
*/
// TODO: Add example.
//
#[derive(Default, PartialEq)]
pub struct AttachmentBuilder {
content_type: ContentType,
content_transfer_encoding: ContentTransferEncoding,
raw: Vec<u8>,
}
#[derive(Clone, Serialize, Deserialize, PartialEq)]
pub struct Attachment {
content_type: ContentType,
content_transfer_encoding: ContentTransferEncoding,
raw: Vec<u8>,
}
impl fmt::Debug for Attachment {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "Attachment {{\n content_type: {:?},\n content_transfer_encoding: {:?},\n raw: Vec of {} bytes\n, body:\n{}\n }}",
self.content_type,
self.content_transfer_encoding,
self.raw.len(),
str::from_utf8(&self.raw).unwrap())
}
}
impl AttachmentBuilder {
pub fn new(content: &[u8]) -> Self {
AttachmentBuilder {
content_type: Default::default(),
content_transfer_encoding: ContentTransferEncoding::_7Bit,
raw: content.to_vec(),
}
}
pub fn content_type(&mut self, value: &[u8]) -> &Self {
match parser::content_type(value).to_full_result() {
Ok((ct, cst, params)) => {
if ct.eq_ignore_ascii_case(b"multipart") {
let mut boundary = None;
for (n, v) in params {
if n.eq_ignore_ascii_case(b"boundary") {
boundary = Some(v);
break;
}
}
assert!(boundary.is_some());
let _boundary = boundary.unwrap();
let offset =
(_boundary.as_ptr() as usize).wrapping_sub(value.as_ptr() as usize);
let boundary = SliceBuild::new(offset, _boundary.len());
let subattachments = Self::subattachments(&self.raw, boundary.get(&value));
assert!(!subattachments.is_empty());
self.content_type = ContentType::Multipart {
boundary,
kind: if cst.eq_ignore_ascii_case(b"mixed") {
MultipartType::Mixed
} else if cst.eq_ignore_ascii_case(b"alternative") {
MultipartType::Alternative
} else if cst.eq_ignore_ascii_case(b"digest") {
MultipartType::Digest
} else {
Default::default()
},
subattachments,
};
} else if ct.eq_ignore_ascii_case(b"text") {
self.content_type = ContentType::Text {
kind: Text::Plain,
charset: Charset::UTF8,
};
for (n, v) in params {
if n.eq_ignore_ascii_case(b"charset") {
if let ContentType::Text {
charset: ref mut c, ..
} = self.content_type
{
*c = Charset::from(v);
}
break;
}
}
if cst.eq_ignore_ascii_case(b"html") {
if let ContentType::Text {
kind: ref mut k, ..
} = self.content_type
{
*k = Text::Html;
}
} else if !cst.eq_ignore_ascii_case(b"plain") {
if let ContentType::Text {
kind: ref mut k, ..
} = self.content_type
{
*k = Text::Other { tag: cst.into() };
}
}
} else if ct.eq_ignore_ascii_case(b"message") && cst.eq_ignore_ascii_case(b"rfc822")
{
self.content_type = ContentType::MessageRfc822;
} else {
let mut tag: Vec<u8> = Vec::with_capacity(ct.len() + cst.len() + 1);
tag.extend(ct);
tag.push(b'/');
tag.extend(cst);
self.content_type = ContentType::Unsupported { tag };
}
}
Err(v) => {
eprintln!("parsing error in content_type: {:?} {:?}", value, v);
}
}
self
}
pub fn content_transfer_encoding(&mut self, value: &[u8]) -> &Self {
self.content_transfer_encoding = if value.eq_ignore_ascii_case(b"base64") {
ContentTransferEncoding::Base64
} else if value.eq_ignore_ascii_case(b"7bit") {
ContentTransferEncoding::_7Bit
} else if value.eq_ignore_ascii_case(b"8bit") {
ContentTransferEncoding::_8Bit
} else if value.eq_ignore_ascii_case(b"quoted-printable") {
ContentTransferEncoding::QuotedPrintable
} else {
ContentTransferEncoding::Other {
tag: value.to_ascii_lowercase(),
}
};
self
}
/*
fn decode(&self) -> Vec<u8> {
// TODO merge this and standalone decode() function
let charset = match self.content_type {
ContentType::Text { charset: c, .. } => c,
_ => Default::default(),
};
let bytes = match self.content_transfer_encoding {
ContentTransferEncoding::Base64 => match BASE64_MIME.decode(&self.raw) {
Ok(v) => v,
_ => self.raw.to_vec(),
},
ContentTransferEncoding::QuotedPrintable => parser::quoted_printable_bytes(&self.raw)
.to_full_result()
.unwrap(),
ContentTransferEncoding::_7Bit
| ContentTransferEncoding::_8Bit
| ContentTransferEncoding::Other { .. } => self.raw.to_vec(),
};
if let Ok(b) = parser::decode_charset(&bytes, charset) {
b.into_bytes()
} else {
self.raw.to_vec()
}
}
*/
pub fn build(self) -> Attachment {
Attachment {
content_type: self.content_type,
content_transfer_encoding: self.content_transfer_encoding,
raw: self.raw,
}
}
pub fn subattachments(raw: &[u8], boundary: &[u8]) -> Vec<Attachment> {
match parser::attachments(raw, boundary).to_full_result() {
Ok(attachments) => {
let mut vec = Vec::with_capacity(attachments.len());
for a in attachments {
let mut builder = AttachmentBuilder::default();
let (headers, body) = match parser::attachment(&a).to_full_result() {
Ok(v) => v,
Err(_) => {
eprintln!("error in parsing attachment");
eprintln!("\n-------------------------------");
eprintln!("{}\n", ::std::string::String::from_utf8_lossy(a));
eprintln!("-------------------------------\n");
continue;
}
};
let body_slice = {
let offset = (body.as_ptr() as usize).wrapping_sub(a.as_ptr() as usize);
SliceBuild::new(offset, body.len())
};
builder.raw = body_slice.get(a).ltrim().into();
for (name, value) in headers {
if name.eq_ignore_ascii_case(b"content-type") {
builder.content_type(value);
} else if name.eq_ignore_ascii_case(b"content-transfer-encoding") {
builder.content_transfer_encoding(value);
}
}
vec.push(builder.build());
}
vec
}
a => {
eprintln!(
"error {:?}\n\traw: {:?}\n\tboundary: {:?}",
a,
str::from_utf8(raw).unwrap(),
boundary
);
Vec::new()
}
}
}
}
impl fmt::Display for Attachment {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self.content_type {
ContentType::MessageRfc822 => match EnvelopeWrapper::new(self.bytes().to_vec()) {
Ok(wrapper) => write!(
f,
"message/rfc822: {} - {} - {}",
wrapper.date(),
wrapper.field_from_to_string(),
wrapper.subject()
),
Err(e) => write!(f, "{}", e),
},
ContentType::Unsupported { .. } => {
write!(f, "Data attachment of type {}", self.mime_type())
}
ContentType::Text { .. } => write!(f, "Text attachment of type {}", self.mime_type()),
ContentType::Multipart {
subattachments: ref sub_att_vec,
..
} => write!(
f,
"{} attachment with {} subs",
self.mime_type(),
sub_att_vec.len()
),
}
}
}
impl Attachment {
pub fn new(
content_type: ContentType,
content_transfer_encoding: ContentTransferEncoding,
raw: Vec<u8>,
) -> Self {
Attachment {
content_type,
content_transfer_encoding,
raw,
}
}
pub fn bytes(&self) -> &[u8] {
&self.raw
}
fn get_text_recursive(&self, text: &mut Vec<u8>) {
match self.content_type {
ContentType::Text { .. } => {
text.extend(decode(self, None));
}
ContentType::Multipart {
kind: ref multipart_type,
subattachments: ref sub_att_vec,
..
} => match *multipart_type {
MultipartType::Alternative => {
for a in sub_att_vec {
if let ContentType::Text {
kind: Text::Plain, ..
} = a.content_type
{
a.get_text_recursive(text);
break;
}
}
}
MultipartType::Mixed | MultipartType::Digest => {
for a in sub_att_vec {
a.get_text_recursive(text);
}
}
},
_ => {}
}
}
pub fn text(&self) -> String {
let mut text = Vec::with_capacity(self.raw.len());
self.get_text_recursive(&mut text);
String::from_utf8_lossy(text.as_slice().trim()).into()
}
pub fn description(&self) -> Vec<String> {
self.attachments().iter().map(|a| a.text()).collect()
}
pub fn mime_type(&self) -> String {
format!("{}", self.content_type).to_string()
}
pub fn attachments(&self) -> Vec<Attachment> {
let mut ret = Vec::new();
fn count_recursive(att: &Attachment, ret: &mut Vec<Attachment>) {
match att.content_type {
ContentType::Multipart {
subattachments: ref sub_att_vec,
..
} => {
ret.push(att.clone());
// FIXME: Wrong count
for a in sub_att_vec {
count_recursive(a, ret);
}
}
_ => ret.push(att.clone()),
}
}
count_recursive(&self, &mut ret);
ret
}
pub fn count_attachments(&self) -> usize {
self.attachments().len()
}
pub fn content_type(&self) -> &ContentType {
&self.content_type
}
pub fn content_transfer_encoding(&self) -> &ContentTransferEncoding {
&self.content_transfer_encoding
}
pub fn is_html(&self) -> bool {
match self.content_type {
ContentType::Text {
kind: Text::Html, ..
} => true,
_ => false,
}
}
}
pub fn interpret_format_flowed(_t: &str) -> String {
//let mut n = String::with_capacity(t.len());
unimplemented!()
}
fn decode_rfc822(_raw: &[u8]) -> Attachment {
let builder = AttachmentBuilder::new(b"");
builder.build()
/*
eprintln!("raw is\n{:?}", str::from_utf8(raw).unwrap());
let e = match Envelope::from_bytes(raw) {
Some(e) => e,
None => {
eprintln!("error in parsing mail");
let error_msg = b"Mail cannot be shown because of errors.";
let mut builder = AttachmentBuilder::new(error_msg);
return builder.build();
}
};
e.body(None)
*/
}
type Filter = Box<Fn(&Attachment, &mut Vec<u8>) -> ()>;
fn decode_rec_helper(a: &Attachment, filter: &Option<Filter>) -> Vec<u8> {
let mut ret = match a.content_type {
ContentType::Unsupported { .. } => Vec::new(),
ContentType::Text { .. } => decode_helper(a, filter),
ContentType::MessageRfc822 => decode_rec(&decode_rfc822(&a.raw), None),
ContentType::Multipart {
kind: ref multipart_type,
subattachments: ref sub_att_vec,
..
} => {
if *multipart_type == MultipartType::Alternative {
for a in sub_att_vec {
if let ContentType::Text {
kind: Text::Plain, ..
} = a.content_type
{
return decode_helper(a, filter);
}
}
decode_helper(a, filter)
} else {
let mut vec = Vec::new();
for a in sub_att_vec {
vec.extend(decode_rec_helper(a, filter));
}
vec
}
}
};
if let Some(filter) = filter {
filter(a, &mut ret);
}
ret
}
pub fn decode_rec(a: &Attachment, filter: Option<Filter>) -> Vec<u8> {
decode_rec_helper(a, &filter)
}
fn decode_helper(a: &Attachment, filter: &Option<Filter>) -> Vec<u8> {
let charset = match a.content_type {
ContentType::Text { charset: c, .. } => c,
_ => Default::default(),
};
let bytes = match a.content_transfer_encoding {
ContentTransferEncoding::Base64 => match BASE64_MIME.decode(a.bytes()) {
Ok(v) => v,
_ => a.bytes().to_vec(),
},
ContentTransferEncoding::QuotedPrintable => parser::quoted_printable_bytes(a.bytes())
.to_full_result()
.unwrap(),
ContentTransferEncoding::_7Bit
| ContentTransferEncoding::_8Bit
| ContentTransferEncoding::Other { .. } => a.bytes().to_vec(),
};
let mut ret = if a.content_type.is_text() {
if let Ok(v) = parser::decode_charset(&bytes, charset) {
v.into_bytes()
} else {
a.bytes().to_vec()
}
} else {
bytes.to_vec()
};
if let Some(filter) = filter {
filter(a, &mut ret);
}
ret
}
pub fn decode(a: &Attachment, filter: Option<Filter>) -> Vec<u8> {
decode_helper(a, &filter)
}