content type header
This commit is contained in:
parent
e3b10a994b
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GPG key ID:
E9602264D639FF68
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@ -8,6 +8,7 @@
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- Maintainability - modifying the code does not create regression and is possible for someone exterior to the project. Keep cyclomatic complexity low.
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- Composability - build your own parser by picking the relevant passes, avoid work that is not needed.
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- Compatibility - always try to parse something, do not panic or return an error.
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- Exhaustivity - serve as a common project to encode knowledge about emails (existing mime types, existing headers, etc.).
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## Non goals
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@ -16,4 +16,5 @@ pub enum IMFError<'a> {
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PhraseList(nom::Err<nom::error::Error<&'a str>>),
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ReceivedLog(nom::Err<nom::error::Error<&'a str>>),
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Version(nom::Err<nom::error::Error<&'a str>>),
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ContentType(nom::Err<nom::error::Error<&'a str>>),
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}
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@ -1,12 +1,19 @@
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use std::borrow::Cow;
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use encoding_rs::Encoding;
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use nom::{
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bytes::complete::tag, character::complete as character, combinator::opt, sequence::tuple,
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branch::alt,
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bytes::complete::{tag,take_while1},
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character::complete as character,
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combinator::{into, opt},
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multi::many0,
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sequence::{delimited, preceded, tuple},
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IResult,
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};
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use crate::error::IMFError;
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use crate::fragments::lazy;
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use crate::fragments::whitespace::cfws;
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use crate::fragments::quoted::quoted_string;
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#[derive(Debug, PartialEq)]
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pub struct Version {
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@ -17,42 +24,69 @@ pub struct Version {
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#[derive(Debug, PartialEq)]
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pub enum Type<'a> {
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// Composite types
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Multipart(MultipartSubtype<'a>),
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Message(MessageSubtype<'a>),
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Multipart(MultipartDesc<'a>),
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Message(MessageDesc<'a>),
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// Discrete types
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Text(&'a str),
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Image(&'a str),
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Audio(&'a str),
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Video(&'a str),
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Application(&'a str),
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Text(TextDesc<'a>),
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Image(&'a str, Vec<Parameter<'a>>),
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Audio(&'a str, Vec<Parameter<'a>>),
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Video(&'a str, Vec<Parameter<'a>>),
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Application(&'a str, Vec<Parameter<'a>>),
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// Unknown
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Other(&'a str, &'a str, Vec<Parameter<'a>>),
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}
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#[derive(Debug, PartialEq)]
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pub struct MultipartDesc<'a> {
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boundary: String,
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subtype: MultipartSubtype<'a>,
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unknown_parameters: Vec<Parameter<'a>>,
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}
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#[derive(Debug, PartialEq)]
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pub enum MultipartSubtype<'a> {
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Alternative(Parameter<'a>),
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Mixed(Parameter<'a>),
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Digest(Parameter<'a>),
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Parallel(Parameter<'a>),
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Other(&'a str, Parameter<'a>),
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Alternative,
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Mixed,
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Digest,
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Parallel,
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Other(&'a str),
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}
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#[derive(Debug, PartialEq)]
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pub struct MessageDesc<'a> {
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subtype: MessageSubtype<'a>,
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unknown_parameters: Vec<Parameter<'a>>,
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}
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#[derive(Debug, PartialEq)]
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pub enum MessageSubtype<'a> {
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RFC822(Vec<Parameter<'a>>),
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Partial(Vec<Parameter<'a>>),
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External(Vec<Parameter<'a>>),
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Other(&'a str, Vec<Parameter<'a>>),
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RFC822,
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Partial,
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External,
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Other(&'a str),
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}
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#[derive(Debug, PartialEq)]
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pub struct TextDesc<'a> {
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charset: Option<EmailCharset<'a>>,
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subtype: TextSubtype<'a>,
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unknown_parameters: Vec<Parameter<'a>>,
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}
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#[derive(Debug, PartialEq)]
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pub enum TextSubtype<'a> {
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Plain,
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Html,
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Other(&'a str),
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}
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#[derive(Debug, PartialEq)]
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pub enum Parameter<'a> {
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Charset(EmailCharset<'a>),
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Boundary(&'a str),
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Other(&'a str, &'a str),
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Boundary(String),
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Other(&'a str, String),
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}
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/// Specific implementation of charset
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@ -89,7 +123,7 @@ pub enum EmailCharset<'a> {
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Big5,
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KOI8_R,
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UTF_8,
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Other(&'a str),
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Other(Cow<'a, str>),
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}
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#[derive(Debug, PartialEq)]
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@ -101,11 +135,16 @@ pub enum Mechanism<'a> {
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Base64,
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Other(&'a str),
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}
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impl<'a> From<&'a str> for EmailCharset<'a> {
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fn from(s: &'a str) -> Self {
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EmailCharset::from(Cow::Borrowed(s))
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}
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}
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impl<'a> From<Cow<'a, str>> for EmailCharset<'a> {
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fn from(s: Cow<'a, str>) -> Self {
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match s.to_lowercase().as_ref() {
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"us-ascii" => EmailCharset::US_ASCII,
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"us-ascii" | "ascii" => EmailCharset::US_ASCII,
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"iso-8859-1" => EmailCharset::ISO_8859_1,
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"iso-8859-2" => EmailCharset::ISO_8859_2,
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"iso-8859-3" => EmailCharset::ISO_8859_3,
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@ -129,14 +168,14 @@ impl<'a> From<&'a str> for EmailCharset<'a> {
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"gb2312" => EmailCharset::GB2312,
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"big5" => EmailCharset::Big5,
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"koi8-r" => EmailCharset::KOI8_R,
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"utf-8" => EmailCharset::UTF_8,
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"utf-8" | "utf8" => EmailCharset::UTF_8,
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_ => EmailCharset::Other(s)
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}
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}
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}
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impl<'a> EmailCharset<'a> {
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pub fn as_str(&self) -> &'a str {
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pub fn as_str(&'a self) -> &'a str {
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use EmailCharset::*;
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match self {
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US_ASCII => "US-ASCII",
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@ -164,7 +203,7 @@ impl<'a> EmailCharset<'a> {
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Big5 => "Big5",
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KOI8_R => "KOI8-R",
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UTF_8 => "UTF-8",
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Other(raw) => raw,
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Other(raw) => raw.as_ref(),
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}
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}
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@ -188,7 +227,9 @@ impl<'a> TryFrom<&'a lazy::Type<'a>> for Type<'a> {
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type Error = IMFError<'a>;
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fn try_from(tp: &'a lazy::Type<'a>) -> Result<Self, Self::Error> {
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Ok(Type::Other("", "", vec![]))
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content_type(tp.0)
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.map(|(_, v)| v)
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.map_err(|e| IMFError::ContentType(e))
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}
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}
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@ -200,6 +241,40 @@ impl<'a> TryFrom<&'a lazy::Mechanism<'a>> for Mechanism<'a> {
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}
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}
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impl<'a> From<&'a str> for MultipartSubtype<'a> {
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fn from(csub: &'a str) -> Self {
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match csub.to_lowercase().as_ref() {
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"alternative" => MultipartSubtype::Alternative,
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"mixed" => MultipartSubtype::Mixed,
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"digest" => MultipartSubtype::Digest,
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"parallel" => MultipartSubtype::Parallel,
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_ => MultipartSubtype::Other(csub),
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}
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}
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}
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impl<'a> From<&'a str> for MessageSubtype<'a> {
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fn from(csub: &'a str) -> Self {
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match csub.to_lowercase().as_ref() {
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"rfc822" => MessageSubtype::RFC822,
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"partial" => MessageSubtype::Partial,
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"external" => MessageSubtype::External,
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_ => MessageSubtype::Other(csub),
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}
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}
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}
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impl<'a> From<&'a str> for TextSubtype<'a> {
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fn from(csub: &'a str) -> Self {
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match csub.to_lowercase().as_ref() {
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"html" => TextSubtype::Html,
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"plain" => TextSubtype::Plain,
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_ => TextSubtype::Other(csub),
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}
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}
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}
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pub fn version(input: &str) -> IResult<&str, Version> {
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let (rest, (_, major, _, _, _, minor, _)) = tuple((
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opt(cfws),
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@ -213,9 +288,105 @@ pub fn version(input: &str) -> IResult<&str, Version> {
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Ok((rest, Version { major, minor }))
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}
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/// Token allowed characters
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fn is_token_text(c: char) -> bool {
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c.is_ascii() && !c.is_ascii_control() && !c.is_ascii_whitespace() && !"()<>@,;:\\\"/[]?=".contains(c)
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}
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/// Token
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///
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/// `[CFWS] 1*token_text [CFWS]`
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pub fn token(input: &str) -> IResult<&str, &str> {
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delimited(opt(cfws), take_while1(is_token_text), opt(cfws))(input)
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}
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pub fn parameter(input: &str) -> IResult<&str, Parameter> {
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let (rest, (pname, _, pvalue)) = tuple((
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token,
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tag("="),
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alt((quoted_string, into(token)))
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))(input)?;
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let param = match pname.to_lowercase().as_ref() {
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"charset" => Parameter::Charset(EmailCharset::from(Cow::Owned(pvalue))),
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"boundary" => Parameter::Boundary(pvalue),
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_ => Parameter::Other(pname, pvalue),
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};
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Ok((rest, param))
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}
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pub fn content_type(input: &str) -> IResult<&str, Type> {
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let (rest, (ctype, _, csub, params)) = tuple((
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token, tag("/"), token,
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many0(preceded(tag(";"), parameter))
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))(input)?;
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let parsed = match ctype.to_lowercase().as_ref() {
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"multipart" => {
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let (boundary_param, unknown_parameters): (Vec<Parameter>, Vec<Parameter>) = params
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.into_iter()
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.partition(|p| matches!(p, Parameter::Boundary(_)));
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// @FIXME: if multiple boundary value is set, only the
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// first one is picked. We should check that it makes
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// sense with other implementation.
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match boundary_param.into_iter().next() {
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// @FIXME boundary is mandatory. If it is missing,
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// fallback to text/plain. Must check that this behavior
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// is standard...
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None => Type::Text(TextDesc {
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charset: None,
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subtype: TextSubtype::Plain,
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unknown_parameters
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}),
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Some(Parameter::Boundary(v)) => Type::Multipart(MultipartDesc {
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subtype: MultipartSubtype::from(csub),
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unknown_parameters,
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boundary: v.into(),
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}),
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Some(_) => unreachable!(), // checked above
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}
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},
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"message" => {
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Type::Message(MessageDesc {
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subtype: MessageSubtype::from(csub),
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unknown_parameters: params,
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})
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},
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"text" => {
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let (charset_param, unknown_parameters): (Vec<Parameter>, Vec<Parameter>) = params
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.into_iter()
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.partition(|p| matches!(p, Parameter::Charset(_)));
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let charset = match charset_param.into_iter().next() {
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Some(Parameter::Charset(emlchar)) => Some(emlchar),
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_ => None,
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};
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Type::Text(TextDesc {
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subtype: TextSubtype::from(csub),
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charset: charset,
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unknown_parameters,
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})
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},
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"image" => Type::Image(csub, params),
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"audio" => Type::Audio(csub, params),
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"video" => Type::Video(csub, params),
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"application" => Type::Application(csub, params),
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_ => Type::Other(ctype, csub, params),
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};
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Ok((rest, parsed))
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::fragments::lazy;
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#[test]
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fn test_version() {
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@ -265,6 +436,30 @@ mod tests {
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);
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}
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#[test]
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fn test_parameter() {
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assert_eq!(
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parameter("charset=utf-8"),
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Ok(("", Parameter::Charset(EmailCharset::UTF_8))),
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);
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assert_eq!(
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parameter("charset=\"utf-8\""),
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Ok(("", Parameter::Charset(EmailCharset::UTF_8))),
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);
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}
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#[test]
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fn test_content_type_plaintext() {
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assert_eq!(
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Type::try_from(&lazy::Type("text/plain; charset=utf-8")),
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Ok(Type::Text(TextDesc {
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charset: Some(EmailCharset::UTF_8),
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subtype: TextSubtype::Plain,
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unknown_parameters: vec![],
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}))
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);
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}
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/* #[test]
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fn test_parameter() {
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assert_eq!(
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