917 lines
32 KiB
Rust
917 lines
32 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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/*! Encoding/decoding of attachments */
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use crate::email::{
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address::StrBuilder,
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parser::{self, BytesExt},
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Mail,
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};
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use core::fmt;
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use core::str;
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use data_encoding::BASE64_MIME;
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use smallvec::SmallVec;
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use crate::email::attachment_types::*;
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#[derive(Default, Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
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pub struct AttachmentBuilder {
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pub content_type: ContentType,
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pub content_transfer_encoding: ContentTransferEncoding,
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pub content_disposition: ContentDisposition,
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pub raw: Vec<u8>,
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pub body: StrBuilder,
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}
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impl AttachmentBuilder {
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pub fn new(content: &[u8]) -> Self {
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let (headers, body) = match parser::attachments::attachment(content) {
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Ok((_, v)) => v,
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Err(_) => {
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debug!("error in parsing attachment");
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debug!("\n-------------------------------");
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debug!("{}\n", ::std::string::String::from_utf8_lossy(content));
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debug!("-------------------------------\n");
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return AttachmentBuilder {
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content_type: Default::default(),
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content_transfer_encoding: ContentTransferEncoding::_7Bit,
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content_disposition: ContentDisposition::default(),
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raw: content.to_vec(),
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body: StrBuilder {
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length: content.len(),
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offset: 0,
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},
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};
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}
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};
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let raw = content.into();
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let body = StrBuilder {
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offset: content.len() - body.len(),
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length: body.len(),
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};
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let mut builder = AttachmentBuilder {
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raw,
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body,
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..Default::default()
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};
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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.set_content_type_from_bytes(value);
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} else if name.eq_ignore_ascii_case(b"content-transfer-encoding") {
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builder.set_content_transfer_encoding(ContentTransferEncoding::from(value));
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} else if name.eq_ignore_ascii_case(b"content-disposition") {
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builder.set_content_disposition(ContentDisposition::from(value));
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}
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}
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builder
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}
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pub fn raw(&self) -> &[u8] {
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&self.raw
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}
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pub fn body(&self) -> &[u8] {
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self.body.display_bytes(&self.raw)
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}
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pub fn set_raw(&mut self, raw: Vec<u8>) -> &mut Self {
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self.raw = raw;
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self
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}
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/// Set body to the entire raw contents, use this if raw contains only data and no headers
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/// If raw contains data and headers pass it through AttachmentBuilder::new().
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pub fn set_body_to_raw(&mut self) -> &mut Self {
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self.body = StrBuilder {
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offset: 0,
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length: self.raw.len(),
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};
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self
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}
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pub fn set_content_type(&mut self, val: ContentType) -> &mut Self {
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self.content_type = val;
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self
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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 set_content_transfer_encoding(&mut self, val: ContentTransferEncoding) -> &mut Self {
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self.content_transfer_encoding = val;
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self
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}
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pub fn set_content_disposition(&mut self, val: ContentDisposition) -> &mut Self {
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self.content_disposition = val;
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self
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}
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pub fn content_disposition(&self) -> &ContentDisposition {
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&self.content_disposition
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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 set_content_type_from_bytes(&mut self, value: &[u8]) -> &mut Self {
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match parser::attachments::content_type(value) {
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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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if let Some(boundary) = boundary {
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let parts = Self::parts(self.body(), &boundary);
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let boundary = boundary.to_vec();
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self.content_type = ContentType::Multipart {
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boundary,
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kind: MultipartType::from(cst),
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parts,
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};
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} else {
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self.content_type = ContentType::default();
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return self;
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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::default();
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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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}
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if let ContentType::Text {
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parameters: ref mut p,
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..
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} = self.content_type
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{
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p.push((n.to_vec(), v.to_vec()));
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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 if ct.eq_ignore_ascii_case(b"application")
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&& cst.eq_ignore_ascii_case(b"pgp-signature")
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{
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self.content_type = ContentType::PGPSignature;
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} else if ct.eq_ignore_ascii_case(b"application")
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&& cst.eq_ignore_ascii_case(b"pkcs7-signature")
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{
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self.content_type = ContentType::CMSSignature;
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} else {
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let mut name: Option<String> = None;
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for (n, v) in params {
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if n.eq_ignore_ascii_case(b"name") {
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if let Ok(v) = crate::email::parser::encodings::phrase(v.trim(), false)
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.as_ref()
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.map(|(_, r)| String::from_utf8_lossy(r).to_string())
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{
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name = Some(v);
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} else {
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name = Some(String::from_utf8_lossy(v).into());
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}
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break;
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}
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}
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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::Other { tag, name };
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}
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}
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Err(e) => {
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debug!(
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"parsing error in content_type: {:?} {:?}",
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String::from_utf8_lossy(value),
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e
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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 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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content_disposition: self.content_disposition,
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raw: self.raw,
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body: self.body,
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}
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}
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pub fn parts(raw: &[u8], boundary: &[u8]) -> Vec<Attachment> {
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if raw.is_empty() {
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return Vec::new();
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}
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match parser::attachments::parts(raw, boundary) {
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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::attachments::attachment(&a) {
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Ok((_, v)) => v,
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Err(_) => {
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debug!("error in parsing attachment");
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debug!("\n-------------------------------");
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debug!("{}\n", ::std::string::String::from_utf8_lossy(a));
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debug!("-------------------------------\n");
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continue;
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}
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};
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builder.raw = a.into();
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builder.body = StrBuilder {
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offset: a.len() - body.len(),
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length: body.len(),
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};
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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.set_content_type_from_bytes(value);
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} else if name.eq_ignore_ascii_case(b"content-transfer-encoding") {
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builder.set_content_transfer_encoding(ContentTransferEncoding::from(
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value,
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));
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} else if name.eq_ignore_ascii_case(b"content-disposition") {
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builder.set_content_disposition(ContentDisposition::from(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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debug!(
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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 From<Attachment> for AttachmentBuilder {
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fn from(val: Attachment) -> Self {
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let Attachment {
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content_type,
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content_disposition,
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content_transfer_encoding,
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raw,
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body,
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} = val;
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AttachmentBuilder {
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content_type,
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content_disposition,
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content_transfer_encoding,
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raw,
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body,
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}
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}
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}
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impl From<AttachmentBuilder> for Attachment {
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fn from(val: AttachmentBuilder) -> Self {
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let AttachmentBuilder {
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content_type,
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content_transfer_encoding,
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content_disposition,
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raw,
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body,
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} = val;
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Attachment {
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content_type,
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content_transfer_encoding,
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content_disposition,
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raw,
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body,
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}
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}
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}
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/// Immutable attachment type.
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#[derive(Clone, Serialize, Deserialize, PartialEq, Eq)]
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pub struct Attachment {
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pub content_type: ContentType,
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pub content_transfer_encoding: ContentTransferEncoding,
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pub content_disposition: ContentDisposition,
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pub raw: Vec<u8>,
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pub body: StrBuilder,
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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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let mut text = Vec::with_capacity(4096);
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self.get_text_recursive(&mut text);
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f.debug_struct("Attachment")
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.field("content_type", &self.content_type)
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.field("content_transfer_encoding", &self.content_transfer_encoding)
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.field("raw bytes length", &self.raw.len())
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.field("body", &String::from_utf8_lossy(&text))
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.finish()
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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 => {
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match Mail::new(self.body.display_bytes(&self.raw).to_vec(), None) {
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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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crate::Bytes(self.raw.len()),
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),
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Err(err) => write!(
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f,
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"could not parse: {} [message/rfc822] {}",
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err,
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crate::Bytes(self.raw.len()),
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),
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}
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}
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ContentType::PGPSignature => write!(f, "pgp signature [{}]", self.mime_type()),
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ContentType::CMSSignature => write!(f, "S/MIME signature [{}]", self.mime_type()),
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ContentType::OctetStream { .. } | ContentType::Other { .. } => {
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if let Some(name) = self.filename() {
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write!(
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f,
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"\"{}\", [{}] {}",
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name,
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self.mime_type(),
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crate::Bytes(self.raw.len())
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)
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} else {
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write!(
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f,
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"Data attachment [{}] {}",
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self.mime_type(),
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crate::Bytes(self.raw.len())
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)
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}
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}
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ContentType::Text { .. } => {
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if let Some(name) = self.filename() {
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write!(
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f,
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"\"{}\", [{}] {}",
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name,
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self.mime_type(),
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crate::Bytes(self.raw.len())
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)
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} else {
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write!(
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f,
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"Text attachment [{}] {}",
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self.mime_type(),
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crate::Bytes(self.raw.len())
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)
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}
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}
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ContentType::Multipart {
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parts: ref sub_att_vec,
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..
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} => write!(
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f,
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"{} attachment with {} parts",
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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_disposition: ContentDisposition::default(),
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content_transfer_encoding,
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body: StrBuilder {
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length: raw.len(),
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offset: 0,
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},
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raw,
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}
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}
|
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pub fn raw(&self) -> &[u8] {
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&self.raw
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}
|
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pub fn body(&self) -> &[u8] {
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self.body.display_bytes(&self.raw)
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}
|
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pub fn part_boundaries(&self) -> Vec<StrBuilder> {
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if self.raw.is_empty() {
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return Vec::new();
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}
|
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|
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match self.content_type {
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ContentType::Multipart { ref boundary, .. } => {
|
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match parser::attachments::multipart_parts(self.body(), boundary) {
|
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Ok((_, v)) => v,
|
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Err(e) => {
|
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debug!("error in parsing attachment");
|
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debug!("\n-------------------------------");
|
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debug!("{}\n", ::std::string::String::from_utf8_lossy(&self.raw));
|
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debug!("-------------------------------\n");
|
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debug!("{:?}\n", e);
|
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Vec::new()
|
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}
|
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}
|
|
}
|
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_ => Vec::new(),
|
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}
|
|
}
|
|
|
|
/* Call on the body of a multipart/mixed Envelope to check if there are attachments without
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* completely parsing them */
|
|
pub fn check_if_has_attachments_quick(bytes: &[u8], boundary: &[u8]) -> bool {
|
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if bytes.is_empty() {
|
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return false;
|
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}
|
|
|
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match parser::attachments::multipart_parts(bytes, boundary) {
|
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Ok((_, parts)) => {
|
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for p in parts {
|
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let (body, headers) = match parser::headers::headers_raw(p.display_bytes(bytes))
|
|
{
|
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Ok(v) => v,
|
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Err(_err) => return false,
|
|
};
|
|
let headers = crate::email::parser::generic::HeaderIterator(headers)
|
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.collect::<SmallVec<[(&[u8], &[u8]); 16]>>();
|
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let disposition = headers
|
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.iter()
|
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.find(|(n, _)| n.eq_ignore_ascii_case(b"content-disposition"))
|
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.map(|(_, v)| ContentDisposition::from(*v))
|
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.unwrap_or_default();
|
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if disposition.kind.is_attachment() {
|
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return true;
|
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}
|
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if let Some(boundary) = headers
|
|
.iter()
|
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.find(|(n, _)| n.eq_ignore_ascii_case(b"content-type"))
|
|
.and_then(|(_, v)| {
|
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match parser::attachments::content_type(v) {
|
|
Ok((_, (ct, _cst, params))) => {
|
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if ct.eq_ignore_ascii_case(b"multipart") {
|
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let mut boundary = None;
|
|
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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return boundary;
|
|
}
|
|
}
|
|
_ => {}
|
|
}
|
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None
|
|
})
|
|
{
|
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if Attachment::check_if_has_attachments_quick(body, boundary) {
|
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return true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
Err(e) => {
|
|
debug!("error in parsing multipart_parts");
|
|
debug!("\n-------------------------------");
|
|
debug!("{}\n", ::std::string::String::from_utf8_lossy(bytes));
|
|
debug!("-------------------------------\n");
|
|
debug!("{:?}\n", e);
|
|
}
|
|
}
|
|
false
|
|
}
|
|
|
|
fn get_text_recursive(&self, text: &mut Vec<u8>) {
|
|
match self.content_type {
|
|
ContentType::Text { .. } | ContentType::PGPSignature | ContentType::CMSSignature => {
|
|
text.extend(decode(self, None));
|
|
}
|
|
ContentType::Multipart {
|
|
ref kind,
|
|
ref parts,
|
|
..
|
|
} => match kind {
|
|
MultipartType::Alternative => {
|
|
for a in parts {
|
|
if a.content_disposition.kind.is_inline() {
|
|
if let ContentType::Text {
|
|
kind: Text::Plain, ..
|
|
} = a.content_type
|
|
{
|
|
a.get_text_recursive(text);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
_ => {
|
|
for a in parts {
|
|
if a.content_disposition.kind.is_inline() {
|
|
a.get_text_recursive(text);
|
|
}
|
|
}
|
|
}
|
|
},
|
|
_ => {}
|
|
}
|
|
}
|
|
pub fn text(&self) -> String {
|
|
let mut text = Vec::with_capacity(self.body.length);
|
|
self.get_text_recursive(&mut text);
|
|
String::from_utf8_lossy(text.as_slice()).into()
|
|
}
|
|
|
|
pub fn mime_type(&self) -> String {
|
|
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 {
|
|
parts: 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_text(&self) -> bool {
|
|
match self.content_type {
|
|
ContentType::Text { .. } => true,
|
|
_ => false,
|
|
}
|
|
}
|
|
pub fn is_html(&self) -> bool {
|
|
match self.content_type {
|
|
ContentType::Text {
|
|
kind: Text::Html, ..
|
|
} => true,
|
|
ContentType::Text {
|
|
kind: Text::Plain, ..
|
|
} => false,
|
|
ContentType::Multipart {
|
|
kind: MultipartType::Alternative,
|
|
ref parts,
|
|
..
|
|
} => parts.iter().all(Attachment::is_html),
|
|
|
|
ContentType::Multipart { ref parts, .. } => parts.iter().any(Attachment::is_html),
|
|
_ => false,
|
|
}
|
|
}
|
|
|
|
pub fn is_encrypted(&self) -> bool {
|
|
match self.content_type {
|
|
ContentType::Multipart {
|
|
kind: MultipartType::Encrypted,
|
|
..
|
|
} => true,
|
|
_ => false,
|
|
}
|
|
}
|
|
|
|
pub fn is_signed(&self) -> bool {
|
|
match self.content_type {
|
|
ContentType::Multipart {
|
|
kind: MultipartType::Signed,
|
|
..
|
|
} => true,
|
|
_ => false,
|
|
}
|
|
}
|
|
|
|
pub fn into_raw(&self) -> String {
|
|
let mut ret = String::with_capacity(2 * self.raw.len());
|
|
fn into_raw_helper(a: &Attachment, ret: &mut String) {
|
|
ret.push_str(&format!(
|
|
"Content-Transfer-Encoding: {}\r\n",
|
|
a.content_transfer_encoding
|
|
));
|
|
match &a.content_type {
|
|
ContentType::Text {
|
|
kind: _,
|
|
parameters,
|
|
charset,
|
|
} => {
|
|
ret.push_str(&format!(
|
|
"Content-Type: {}; charset={}",
|
|
a.content_type, charset
|
|
));
|
|
for (n, v) in parameters {
|
|
ret.push_str("; ");
|
|
ret.push_str(&String::from_utf8_lossy(n));
|
|
ret.push_str("=");
|
|
if v.contains(&b' ') {
|
|
ret.push_str("\"");
|
|
}
|
|
ret.push_str(&String::from_utf8_lossy(v));
|
|
if v.contains(&b' ') {
|
|
ret.push_str("\"");
|
|
}
|
|
}
|
|
|
|
ret.push_str("\r\n\r\n");
|
|
ret.push_str(&String::from_utf8_lossy(a.body()));
|
|
}
|
|
ContentType::Multipart {
|
|
boundary,
|
|
kind,
|
|
parts,
|
|
} => {
|
|
let boundary = String::from_utf8_lossy(boundary);
|
|
ret.push_str(&format!("Content-Type: {}; boundary={}", kind, boundary));
|
|
if *kind == MultipartType::Signed {
|
|
ret.push_str("; micalg=pgp-sha512; protocol=\"application/pgp-signature\"");
|
|
}
|
|
ret.push_str("\r\n");
|
|
|
|
let boundary_start = format!("\r\n--{}\r\n", boundary);
|
|
for p in parts {
|
|
ret.push_str(&boundary_start);
|
|
into_raw_helper(p, ret);
|
|
}
|
|
ret.push_str(&format!("--{}--\r\n\r\n", boundary));
|
|
}
|
|
ContentType::MessageRfc822 => {
|
|
ret.push_str(&format!("Content-Type: {}\r\n\r\n", a.content_type));
|
|
ret.push_str(&String::from_utf8_lossy(a.body()));
|
|
}
|
|
ContentType::CMSSignature | ContentType::PGPSignature => {
|
|
ret.push_str(&format!("Content-Type: {}\r\n\r\n", a.content_type));
|
|
ret.push_str(&String::from_utf8_lossy(a.body()));
|
|
}
|
|
ContentType::OctetStream { ref name } => {
|
|
if let Some(name) = name {
|
|
ret.push_str(&format!(
|
|
"Content-Type: {}; name={}\r\n\r\n",
|
|
a.content_type, name
|
|
));
|
|
} else {
|
|
ret.push_str(&format!("Content-Type: {}\r\n\r\n", a.content_type));
|
|
}
|
|
ret.push_str(&BASE64_MIME.encode(a.body()).trim());
|
|
}
|
|
_ => {
|
|
ret.push_str(&format!("Content-Type: {}\r\n\r\n", a.content_type));
|
|
ret.push_str(&String::from_utf8_lossy(a.body()));
|
|
}
|
|
}
|
|
}
|
|
into_raw_helper(self, &mut ret);
|
|
ret
|
|
}
|
|
|
|
pub fn parameters(&self) -> Vec<(&[u8], &[u8])> {
|
|
let mut ret = Vec::new();
|
|
let (headers, _) = match parser::attachments::attachment(&self.raw) {
|
|
Ok((_, v)) => v,
|
|
Err(_) => return ret,
|
|
};
|
|
for (name, value) in headers {
|
|
if name.eq_ignore_ascii_case(b"content-type") {
|
|
match parser::attachments::content_type(value) {
|
|
Ok((_, (_, _, params))) => {
|
|
ret = params;
|
|
}
|
|
_ => {}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
ret
|
|
}
|
|
|
|
pub fn filename(&self) -> Option<String> {
|
|
if self.content_disposition.kind.is_attachment() {
|
|
self.content_disposition.filename.clone()
|
|
} else {
|
|
None
|
|
}
|
|
.or_else(|| match &self.content_type {
|
|
ContentType::Text { parameters, .. } => parameters
|
|
.iter()
|
|
.find(|(h, _)| {
|
|
h.eq_ignore_ascii_case(b"name") | h.eq_ignore_ascii_case(b"filename")
|
|
})
|
|
.map(|(_, v)| String::from_utf8_lossy(v).to_string()),
|
|
ContentType::Other { .. } | ContentType::OctetStream { .. } => {
|
|
self.content_type.name().map(|s| s.to_string())
|
|
}
|
|
_ => None,
|
|
})
|
|
.map(|s| {
|
|
crate::email::parser::encodings::phrase(s.as_bytes(), false)
|
|
.map(|(_, v)| v)
|
|
.ok()
|
|
.and_then(|n| String::from_utf8(n).ok())
|
|
.unwrap_or_else(|| s)
|
|
})
|
|
.map(|n| n.replace(|c| std::path::is_separator(c) || c.is_ascii_control(), "_"))
|
|
}
|
|
}
|
|
|
|
pub fn interpret_format_flowed(_t: &str) -> String {
|
|
unimplemented!()
|
|
}
|
|
|
|
type Filter<'a> = Box<dyn FnMut(&Attachment, &mut Vec<u8>) -> () + 'a>;
|
|
|
|
fn decode_rec_helper<'a, 'b>(a: &'a Attachment, filter: &mut Option<Filter<'b>>) -> Vec<u8> {
|
|
match a.content_type {
|
|
ContentType::Other { .. } => Vec::new(),
|
|
ContentType::Text { .. } => decode_helper(a, filter),
|
|
ContentType::OctetStream { ref name } => {
|
|
name.clone().unwrap_or_else(|| a.mime_type()).into_bytes()
|
|
}
|
|
ContentType::CMSSignature | ContentType::PGPSignature => Vec::new(),
|
|
ContentType::MessageRfc822 => {
|
|
if a.content_disposition.kind.is_inline() {
|
|
let b = AttachmentBuilder::new(a.body()).build();
|
|
let ret = decode_rec_helper(&b, filter);
|
|
ret
|
|
} else {
|
|
b"message/rfc822 attachment".to_vec()
|
|
}
|
|
}
|
|
ContentType::Multipart {
|
|
ref kind,
|
|
ref parts,
|
|
..
|
|
} => match kind {
|
|
MultipartType::Alternative => {
|
|
for a in parts {
|
|
if let ContentType::Text {
|
|
kind: Text::Plain, ..
|
|
} = a.content_type
|
|
{
|
|
return decode_helper(a, filter);
|
|
}
|
|
}
|
|
decode_helper(a, filter)
|
|
}
|
|
MultipartType::Signed => {
|
|
let mut vec = Vec::new();
|
|
for a in parts {
|
|
vec.extend(decode_rec_helper(a, filter));
|
|
}
|
|
vec.extend(decode_helper(a, filter));
|
|
vec
|
|
}
|
|
MultipartType::Encrypted => {
|
|
let mut vec = Vec::new();
|
|
for a in parts {
|
|
if a.content_type == "application/octet-stream" {
|
|
vec.extend(decode_rec_helper(a, filter));
|
|
}
|
|
}
|
|
vec.extend(decode_helper(a, filter));
|
|
vec
|
|
}
|
|
_ => {
|
|
let mut vec = Vec::new();
|
|
for a in parts {
|
|
if a.content_disposition.kind.is_inline() {
|
|
vec.extend(decode_rec_helper(a, filter));
|
|
}
|
|
}
|
|
vec
|
|
}
|
|
},
|
|
}
|
|
}
|
|
|
|
pub fn decode_rec<'a, 'b>(a: &'a Attachment, mut filter: Option<Filter<'b>>) -> Vec<u8> {
|
|
decode_rec_helper(a, &mut filter)
|
|
}
|
|
|
|
fn decode_helper<'a, 'b>(a: &'a Attachment, filter: &mut Option<Filter<'b>>) -> 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.body()) {
|
|
Ok(v) => v,
|
|
_ => a.body().to_vec(),
|
|
},
|
|
ContentTransferEncoding::QuotedPrintable => {
|
|
parser::encodings::quoted_printable_bytes(a.body())
|
|
.unwrap()
|
|
.1
|
|
}
|
|
ContentTransferEncoding::_7Bit
|
|
| ContentTransferEncoding::_8Bit
|
|
| ContentTransferEncoding::Other { .. } => a.body().to_vec(),
|
|
};
|
|
|
|
let mut ret = if a.content_type.is_text() {
|
|
if let Ok(v) = parser::encodings::decode_charset(&bytes, charset) {
|
|
v.into_bytes()
|
|
} else {
|
|
a.body().to_vec()
|
|
}
|
|
} else {
|
|
bytes.to_vec()
|
|
};
|
|
if let Some(filter) = filter {
|
|
filter(a, &mut ret);
|
|
}
|
|
|
|
ret
|
|
}
|
|
|
|
pub fn decode<'a, 'b>(a: &'a Attachment, mut filter: Option<Filter<'b>>) -> Vec<u8> {
|
|
decode_helper(a, &mut filter)
|
|
}
|