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