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chore: checkpoint before Python removal

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Sienna Meridian Satterwhite
2026-03-26 22:33:59 +00:00
parent 683cec9307
commit e568ddf82a
29972 changed files with 11269302 additions and 2 deletions
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1
vendor/email-encoding/.cargo-checksum.json vendored Normal file
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{"files":{".cargo_vcs_info.json":"fcc991274c3c1f0554e03b8e614abf69a8d8820c02e32bf8d6a64e0f8c231a78",".github/workflows/ci.yml":"20018e472e55d9cb67dac381f93c9d2e80c808b998e5454b99fa2f26170326f7","Cargo.lock":"6ff13df501b807ac68d0e384e4fc0dcf4bb50594d7790b83b22d75dc36270a80","Cargo.toml":"b3a1ae6d77b64116fef0ec2c6e998d60cd85952054237111ed9396ad02935e29","Cargo.toml.orig":"d9569ae28a61362a86063a642bf650c44f6f0c50fbc5298cfa87d24d57668637","LICENSE-APACHE":"c71d239df91726fc519c6eb72d318ec65820627232b2f796219e87dcf35d0ab4","LICENSE-MIT":"c5d18f2569938b6d61594f799702b7a29b5c33fba64dc5669875a50d5523aee6","README.md":"00a8b9ff2f7bcb4ca12cbdaa9065f68ad399b0c12f198051bf6b007c12d6ca61","src/body/base64.rs":"2e655d80dad1dfd9149159be0624f6e371249f8e700e5d870ed21f989a30ba69","src/body/chooser.rs":"4e781767476c70c2993aafeaf92b818b011d16b01169500eab68ae51459ea1af","src/body/mod.rs":"992aa372ebf6270accd000a5520cf39252eecbd1d9e3de0eeda424bdbb6206f5","src/headers/hex.rs":"b9f2cfed004b4ba14137271c941722a6dc6fd8720cb550a8ef3d4822c039cf93","src/headers/hex_encoding.rs":"b0ecd08d981bb55ddc72a171b49b828aa27fb24a88597c7f998f01fdec47663c","src/headers/mod.rs":"348026b6469263aae231c646986b1981db0795057b60e08cde0d6e90f8ce05f5","src/headers/quoted_string.rs":"f9e154d9f016bada4d2af99f75d3496e7b2f4b378668b8e6c52e362a8aefa7ed","src/headers/rfc2047.rs":"916ba03de54268ebdc82473bd54c15006b31fa4c4681970eb06c6ab3d8ea92d9","src/headers/rfc2231.rs":"c7ac13c31ad75401d628422224a178919b8f4a4ad7111b1cbd1617fcc1bfd719","src/headers/utils.rs":"84bf54b3f9b42cdfdd91ba1f79134b25fbad5d3f5ab13c75052d67266ba84aad","src/headers/writer.rs":"bf0759351246b854a6a2dcdef2740553479174964cc451803a0c1551b2c11ed8","src/lib.rs":"5193d006daf0ae787f890072c7fed0174ad833b9632b812c945a21efa967c9d5"},"package":"9298e6504d9b9e780ed3f7dfd43a61be8cd0e09eb07f7706a945b0072b6670b6"}

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vendor/email-encoding/.cargo_vcs_info.json vendored Normal file
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{
"git": {
"sha1": "0e0d592847f56ea4d12e80fd6a2a0adba232099c"
},
"path_in_vcs": ""
}

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vendor/email-encoding/.github/workflows/ci.yml vendored Normal file
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name: CI
on: [push, pull_request]
jobs:
fmt:
name: rustfmt / stable
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- uses: dtolnay/rust-toolchain@stable
with:
components: rustfmt
- name: Rust rustfmt
run: cargo fmt --all -- --check
clippy:
name: clippy / stable
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- uses: dtolnay/rust-toolchain@stable
with:
components: clippy
- name: Run clippy
run: cargo clippy -- -D warnings
test:
name: test / ${{ matrix.name }}
runs-on: ubuntu-latest
strategy:
matrix:
include:
- name: stable
rust: stable
- name: beta
rust: beta
- name: nightly
rust: nightly
- name: 1.63.0
rust: 1.63.0
steps:
- uses: actions/checkout@v4
- uses: dtolnay/rust-toolchain@master
with:
toolchain: ${{ matrix.rust }}
- name: Run tests
run: cargo test
- name: Run no_std tests
run: cargo test --no-default-features
coverage:
name: coverage / stable
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- uses: dtolnay/rust-toolchain@stable
- name: Install cargo-tarpaulin
run: |
LINK="https://github.com/xd009642/tarpaulin/releases/download/0.31.2/cargo-tarpaulin-x86_64-unknown-linux-gnu.tar.gz"
curl -L --output tarpaulin.tar.gz "$LINK"
tar -xzvf tarpaulin.tar.gz
chmod +x cargo-tarpaulin
- name: Run cargo-tarpaulin
run: ./cargo-tarpaulin tarpaulin --out Xml
- name: Upload to codecov.io
uses: codecov/codecov-action@v5
env:
CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
- name: Archive code coverage results
uses: actions/upload-artifact@v4
with:
name: code-coverage-report
path: cobertura.xml

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vendor/email-encoding/Cargo.lock generated vendored Normal file
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 3
[[package]]
name = "base64"
version = "0.22.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
[[package]]
name = "diff"
version = "0.1.13"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "56254986775e3233ffa9c4d7d3faaf6d36a2c09d30b20687e9f88bc8bafc16c8"
[[package]]
name = "email-encoding"
version = "0.4.1"
dependencies = [
"base64",
"memchr",
"pretty_assertions",
]
[[package]]
name = "memchr"
version = "2.7.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
[[package]]
name = "pretty_assertions"
version = "1.4.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3ae130e2f271fbc2ac3a40fb1d07180839cdbbe443c7a27e1e3c13c5cac0116d"
dependencies = [
"diff",
"yansi",
]
[[package]]
name = "yansi"
version = "1.0.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "cfe53a6657fd280eaa890a3bc59152892ffa3e30101319d168b781ed6529b049"

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vendor/email-encoding/Cargo.toml vendored Normal file
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# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies.
#
# If you are reading this file be aware that the original Cargo.toml
# will likely look very different (and much more reasonable).
# See Cargo.toml.orig for the original contents.
[package]
edition = "2021"
rust-version = "1.63"
name = "email-encoding"
version = "0.4.1"
build = false
autolib = false
autobins = false
autoexamples = false
autotests = false
autobenches = false
description = "Low level email encoding RFCs implementations"
readme = "README.md"
keywords = [
"email",
"rfc2047",
"rfc2231",
]
categories = [
"email",
"encoding",
"no-std",
]
license = "MIT OR Apache-2.0"
repository = "https://github.com/lettre/email-encoding"
[features]
default = ["std"]
std = [
"base64/std",
"memchr/std",
]
[lib]
name = "email_encoding"
path = "src/lib.rs"
[dependencies.base64]
version = "0.22"
default-features = false
[dependencies.memchr]
version = "2.1"
default-features = false
[dev-dependencies.pretty_assertions]
version = "1"

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vendor/email-encoding/LICENSE-APACHE vendored Normal file
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21
vendor/email-encoding/LICENSE-MIT vendored Normal file
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MIT License
Copyright (c) 2021-2024 Paolo Barbolini <paolo@paolo565.org>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# email-encoding
[![crates.io](https://img.shields.io/crates/v/email-encoding.svg)](https://crates.io/crates/email-encoding)
[![Documentation](https://docs.rs/email-encoding/badge.svg)](https://docs.rs/email-encoding)
[![dependency status](https://deps.rs/crate/email-encoding/0.3.1/status.svg)](https://deps.rs/crate/email-encoding/0.3.1)
[![Rustc Version 1.63.0+](https://img.shields.io/badge/rustc-1.63.0+-lightgray.svg)](https://blog.rust-lang.org/2022/08/11/Rust-1.63.0.html)
[![CI](https://github.com/lettre/email-encoding/actions/workflows/ci.yml/badge.svg)](https://github.com/lettre/email-encoding/actions/workflows/ci.yml)
[![codecov](https://codecov.io/gh/lettre/email-encoding/branch/main/graph/badge.svg)](https://codecov.io/gh/lettre/email-encoding)
Low-level `#[no_std]` crate implementing various RFCs for encoding emails.
Used internally by [lettre].
Implemented RFCs:
* [RFC 2047]
* [RFC 2231]
[lettre]: https://crates.io/crates/lettre
[RFC 2047]: https://datatracker.ietf.org/doc/html/rfc2047
[RFC 2231]: https://datatracker.ietf.org/doc/html/rfc2231

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//! Base64 email body encoder.
use core::{
fmt::{self, Write},
str,
};
use ::base64::Engine;
const LINE_LEN: usize = 76;
const CRLF: &str = "\r\n";
/// Base64 encode the provided bytes.
///
/// Splits the provided `b` into 57 bytes chunks and
/// base64 encodes them, writing the resulting 76 characters
/// CRLF sequence into `w`.
///
/// The last line may be less than 76 characters in length
/// and will not end in CRLF.
///
/// # Examples
///
/// ```rust
/// # fn main() -> core::fmt::Result {
/// let input = "Hello!
/// You've got mail!
/// This one is base64 encoded.
///
/// Enjoy your bytes 📬📬📬";
///
/// let mut output = String::new();
/// email_encoding::body::base64::encode(input.as_bytes(), &mut output)?;
/// assert_eq!(
/// output,
/// concat!(
/// "SGVsbG8hCllvdSd2ZSBnb3QgbWFpbCEKVGhpcyBvbmUgaXMgYmFzZTY0IGVuY29kZWQuCgpFbmpv\r\n",
/// "eSB5b3VyIGJ5dGVzIPCfk6zwn5Os8J+TrA=="
/// )
/// );
/// # Ok(())
/// # }
/// ```
pub fn encode(b: &[u8], w: &mut dyn Write) -> fmt::Result {
let mut buf = [0; LINE_LEN];
let mut chunks = b.chunks(LINE_LEN / 4 * 3).peekable();
while let Some(chunk) = chunks.next() {
let len = ::base64::engine::general_purpose::STANDARD
.encode_slice(chunk, &mut buf)
.expect("base64 output `buf` is not big enough");
w.write_str(str::from_utf8(&buf[..len]).expect("base64 produced an invalid encode"))?;
if chunks.peek().is_some() {
w.write_str(CRLF)?;
}
}
Ok(())
}
/// Predict how many bytes [`encode`] is going to write given a `input_len` input length.
///
/// # Panics
///
/// Panics if any of the internal calculations overflow.
///
/// # Examples
///
/// ```rust
/// # use email_encoding::body::base64::encoded_len;
/// assert_eq!(encoded_len(0), 0);
/// assert_eq!(encoded_len(16), 24);
/// assert_eq!(encoded_len(300), 410);
/// ```
pub const fn encoded_len(input_len: usize) -> usize {
// FIXME: use `Option::expect` with MSRV >= 1.83
macro_rules! checked {
($val:expr) => {
match $val {
Some(val) => val,
None => panic!("overflow"),
}
};
}
let mut base64_len = checked!((input_len / 3).checked_mul(4));
if input_len % 3 != 0 {
base64_len = checked!(base64_len.checked_add(4));
}
let mut crlf_len = base64_len / LINE_LEN * CRLF.len();
if crlf_len >= CRLF.len() && base64_len % LINE_LEN == 0 {
crlf_len -= CRLF.len();
}
checked!(base64_len.checked_add(crlf_len))
}
#[cfg(test)]
mod tests {
use alloc::string::String;
use pretty_assertions::assert_eq;
use super::{encode, encoded_len};
#[test]
fn empty() {
let input = b"";
let mut output = String::new();
encode(input, &mut output).unwrap();
assert_eq!(output, "");
assert_eq!(output.len(), encoded_len(input.len()));
}
#[test]
fn oneline() {
let input = b"012";
let mut output = String::new();
encode(input, &mut output).unwrap();
assert_eq!(output, "MDEy");
assert_eq!(output.len(), encoded_len(input.len()));
}
#[test]
fn oneline_padded() {
let input = b"0123";
let mut output = String::new();
encode(input, &mut output).unwrap();
assert_eq!(output, "MDEyMw==");
assert_eq!(output.len(), encoded_len(input.len()));
}
#[test]
fn multiline() {
let input =
b"012345678998765432100123456789987654321001234567899876543210012345678998765432100";
let mut output = String::new();
encode(input, &mut output).unwrap();
assert_eq!(
output,
concat!(
"MDEyMzQ1Njc4OTk4NzY1NDMyMTAwMTIzNDU2Nzg5OTg3NjU0MzIxMDAxMjM0NTY3ODk5ODc2NTQz\r\n",
"MjEwMDEyMzQ1Njc4OTk4NzY1NDMyMTAw"
)
);
assert_eq!(output.len(), encoded_len(input.len()));
}
#[test]
fn multiline_padded() {
let input =
b"01234567899876543210012345678998765432100123456789987654321001234567899876543210";
let mut output = String::new();
encode(input, &mut output).unwrap();
assert_eq!(
output,
concat!(
"MDEyMzQ1Njc4OTk4NzY1NDMyMTAwMTIzNDU2Nzg5OTg3NjU0MzIxMDAxMjM0NTY3ODk5ODc2NTQz\r\n",
"MjEwMDEyMzQ1Njc4OTk4NzY1NDMyMTA="
)
);
assert_eq!(output.len(), encoded_len(input.len()));
}
#[test]
fn multiline_exact() {
let input =
b"012345678998765432100123456789987654321001234567899876543210012345678998765432100123456789987654321001234567899876543210012345678998765432100123456789987654321001234567899";
let mut output = String::new();
encode(input, &mut output).unwrap();
assert_eq!(
output,
concat!(
"MDEyMzQ1Njc4OTk4NzY1NDMyMTAwMTIzNDU2Nzg5OTg3NjU0MzIxMDAxMjM0NTY3ODk5ODc2NTQz\r\n",
"MjEwMDEyMzQ1Njc4OTk4NzY1NDMyMTAwMTIzNDU2Nzg5OTg3NjU0MzIxMDAxMjM0NTY3ODk5ODc2\r\n",
"NTQzMjEwMDEyMzQ1Njc4OTk4NzY1NDMyMTAwMTIzNDU2Nzg5OTg3NjU0MzIxMDAxMjM0NTY3ODk5"
)
);
assert_eq!(output.len(), encoded_len(input.len()));
}
#[test]
#[should_panic(expected = "overflow")]
fn overflow() {
encoded_len(usize::MAX);
}
}

259
vendor/email-encoding/src/body/chooser.rs vendored Normal file
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use core::mem;
use super::{Encoding, StrOrBytes};
enum InputKind {
Ascii,
Utf8,
Binary,
}
impl StrOrBytes<'_> {
fn kind(&self) -> InputKind {
if self.is_ascii() {
InputKind::Ascii
} else {
match self {
Self::Str(_) => InputKind::Utf8,
Self::Bytes(_) => InputKind::Binary,
}
}
}
}
impl Encoding {
/// Choose the most efficient `Encoding` for `input`
///
/// Look into `input` and decide what encoding format could best
/// be used to represent it.
///
/// If the SMTP server supports the `SMTPUTF8` extension
/// `supports_utf8` _may_ me set to `true`, otherwise `false`
/// is the safest option.
///
/// Possible return values based on `supports_utf8`
///
/// | `Encoding` | `false` | `true` |
/// | ------------------ | ------- | ------ |
/// | `7bit` | ✅ | ✅ |
/// | `8bit` | ❌ | ✅ |
/// | `quoted-printable` | ✅ | ✅ |
/// | `base64` | ✅ | ✅ |
///
/// # Examples
///
/// ```rust
/// # use email_encoding::body::Encoding;
/// // Ascii
/// {
/// let input = "Hello, World!";
/// assert_eq!(Encoding::choose(input, false), Encoding::SevenBit);
/// assert_eq!(Encoding::choose(input, true), Encoding::SevenBit);
/// }
///
/// // Mostly ascii + utf-8
/// {
/// let input = "Hello, World! 📬";
/// assert_eq!(Encoding::choose(input, false), Encoding::QuotedPrintable);
/// assert_eq!(Encoding::choose(input, true), Encoding::EightBit);
/// }
///
/// // Mostly utf-8
/// {
/// let input = "Hello! 📬📬📬📬📬📬📬📬📬📬";
/// assert_eq!(Encoding::choose(input, false), Encoding::Base64);
/// assert_eq!(Encoding::choose(input, true), Encoding::EightBit);
/// }
///
/// // Non utf-8 bytes
/// {
/// let input = &[255, 35, 123, 190];
/// assert_eq!(Encoding::choose(input, false), Encoding::Base64);
/// assert_eq!(Encoding::choose(input, true), Encoding::Base64);
/// }
/// ```
pub fn choose<'a>(input: impl Into<StrOrBytes<'a>>, supports_utf8: bool) -> Self {
let input = input.into();
Self::choose_impl(input, supports_utf8)
}
fn choose_impl(input: StrOrBytes<'_>, supports_utf8: bool) -> Self {
let line_too_long = line_too_long(&input);
match (input.kind(), line_too_long, supports_utf8) {
(InputKind::Ascii, false, _) => {
// Input is ascii and fits the maximum line length
Self::SevenBit
}
(InputKind::Ascii, true, _) => {
// Input is ascii but doesn't fix the maximum line length
quoted_printable_or_base64(&input)
}
(InputKind::Utf8, false, true) => {
// Input is utf-8, line fits, the server supports it
Self::EightBit
}
(InputKind::Utf8, true, true) => {
// Input is utf-8, line doesn't fit, the server supports it
quoted_printable_or_base64(&input)
}
(InputKind::Utf8, _, false) => {
// Input is utf-8, the server doesn't support it
quoted_printable_or_base64(&input)
}
(InputKind::Binary, _, _) => {
// Input is binary
Self::Base64
}
}
}
}
fn line_too_long(b: &[u8]) -> bool {
let mut last = 0;
memchr::memchr_iter(b'\n', b).any(|i| {
let last_ = mem::replace(&mut last, i);
(i - last_) >= 76
}) || (b.len() - last) >= 76
}
fn quoted_printable_or_base64(b: &[u8]) -> Encoding {
if quoted_printable_efficient(b) {
Encoding::QuotedPrintable
} else {
Encoding::Base64
}
}
fn quoted_printable_efficient(b: &[u8]) -> bool {
let requiring_escaping = b
.iter()
.filter(|&b| !matches!(b, b'\t' | b' '..=b'~'))
.count();
requiring_escaping <= (b.len() / 3) // 33.33% or less
}
#[cfg(test)]
mod tests {
use super::{line_too_long, Encoding};
#[test]
fn ascii_short_str() {
let input = "0123";
assert_eq!(Encoding::choose(input, false), Encoding::SevenBit);
}
#[test]
fn ascii_long_str() {
let input = concat!(
"0123\n",
"01234567899876543210012345678998765432100123456789987654321001234567899876543210\n",
"4567"
);
assert_eq!(Encoding::choose(input, false), Encoding::QuotedPrintable);
}
#[test]
fn ascii_short_binary() {
let input = b"0123";
assert_eq!(Encoding::choose(input, false), Encoding::SevenBit);
}
#[test]
fn ascii_long_binary() {
let input = concat!(
"0123\n",
"01234567899876543210012345678998765432100123456789987654321001234567899876543210\n",
"4567"
)
.as_bytes();
assert_eq!(Encoding::choose(input, false), Encoding::QuotedPrintable);
}
#[test]
fn utf8_short_str_supported() {
let input = "0123 📬";
assert_eq!(Encoding::choose(input, true), Encoding::EightBit);
}
#[test]
fn utf8_short_str_unsupported_efficient() {
let input = "01234567899876543210 📬";
assert_eq!(Encoding::choose(input, false), Encoding::QuotedPrintable);
}
#[test]
fn utf8_short_str_unsupported_inefficient() {
let input = "0123 📬";
assert_eq!(Encoding::choose(input, false), Encoding::Base64);
}
#[test]
fn utf8_long_str_efficient() {
let input =
"01234567899876543210012345678998765432100123456789987654321001234567899876543210";
assert_eq!(Encoding::choose(input, true), Encoding::QuotedPrintable);
}
#[test]
fn utf8_long_str_inefficient() {
let input = "0123 📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬📬";
assert_eq!(Encoding::choose(input, true), Encoding::Base64);
}
#[test]
fn binary() {
let input = &[255, 234, b'A', b'C', 210];
assert_eq!(Encoding::choose(input, false), Encoding::Base64);
}
#[test]
fn not_too_long_oneline() {
let input = b"0123";
assert!(!line_too_long(input));
}
#[test]
fn not_too_long_multiline() {
let input = concat!(
"0123\n",
"4567\n",
"00000000000000000000000000000000000000000\n",
"89"
)
.as_bytes();
assert!(!line_too_long(input));
}
#[test]
fn too_long_oneline() {
let input =
b"01234567899876543210012345678998765432100123456789987654321001234567899876543210";
assert!(line_too_long(input));
}
#[test]
fn too_long_multiline() {
let input = concat!(
"0123\n",
"01234567899876543210012345678998765432100123456789987654321001234567899876543210\n",
"4567"
)
.as_bytes();
assert!(line_too_long(input));
}
}

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vendor/email-encoding/src/body/mod.rs vendored Normal file
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//! Email body encoding algorithms.
use core::ops::Deref;
pub mod base64;
mod chooser;
/// A possible email `Content-Transfer-Encoding`
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
pub enum Encoding {
/// 7bit (US-ASCII)
SevenBit,
/// 8bit (UTF-8)
EightBit,
/// [Quoted Printable](https://docs.rs/quoted_printable/0.4.5/quoted_printable/fn.encode_to_str.html)
QuotedPrintable,
/// [Base64](self::base64::encode)
Base64,
}
/// A borrowed `str` or `[u8]`
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
pub enum StrOrBytes<'a> {
/// `str` variant
Str(&'a str),
/// `[u8]` variant
Bytes(&'a [u8]),
}
impl<'a> From<&'a str> for StrOrBytes<'a> {
fn from(s: &'a str) -> Self {
Self::Str(s)
}
}
impl<'a> From<&'a [u8]> for StrOrBytes<'a> {
fn from(s: &'a [u8]) -> Self {
Self::Bytes(s)
}
}
impl<'a, const N: usize> From<&'a [u8; N]> for StrOrBytes<'a> {
fn from(s: &'a [u8; N]) -> Self {
Self::Bytes(s)
}
}
impl Deref for StrOrBytes<'_> {
type Target = [u8];
fn deref(&self) -> &Self::Target {
match self {
Self::Str(s) => s.as_bytes(),
Self::Bytes(b) => b,
}
}
}

9
vendor/email-encoding/src/headers/hex.rs vendored Normal file
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const HEX_CHARS: &[u8; 16] = b"0123456789ABCDEF";
pub(super) const fn encode_byte(byte: u8) -> [u8; 2] {
[lower_nibble_to_hex(byte >> 4), lower_nibble_to_hex(byte)]
}
const fn lower_nibble_to_hex(half_byte: u8) -> u8 {
HEX_CHARS[(half_byte & 0x0F) as usize]
}

42
vendor/email-encoding/src/headers/hex_encoding.rs vendored Normal file
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use core::fmt::{self, Write};
use super::{hex, utils, writer::EmailWriter};
pub(super) fn percent_encode_char(w: &mut EmailWriter<'_>, to_append: char) -> fmt::Result {
encode_char(w, '%', to_append)
}
fn encode_char(w: &mut EmailWriter<'_>, prefix: char, to_append: char) -> fmt::Result {
if utils::char_is_ascii_alphanumeric_plus(to_append) {
w.write_char(to_append)?;
} else {
let mut dst = [0; 4];
let written = to_append.encode_utf8(&mut dst).len();
encode_byte(w, prefix, dst[0])?;
// Manually unrolled loop over `dst`
if written >= 2 {
encode_byte(w, prefix, dst[1])?;
if written >= 3 {
encode_byte(w, prefix, dst[2])?;
if written >= 4 {
encode_byte(w, prefix, dst[3])?;
}
}
}
}
Ok(())
}
fn encode_byte(w: &mut EmailWriter<'_>, prefix: char, to_append: u8) -> fmt::Result {
let chars = hex::encode_byte(to_append);
w.write_char(prefix)?;
w.write_char(char::from(chars[0]))?;
w.write_char(char::from(chars[1]))?;
Ok(())
}

11
vendor/email-encoding/src/headers/mod.rs vendored Normal file
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//! Email header encoding algorithms.
mod hex;
mod hex_encoding;
pub mod quoted_string;
pub mod rfc2047;
pub mod rfc2231;
mod utils;
pub mod writer;
pub(super) const MAX_LINE_LEN: usize = 76;

225
vendor/email-encoding/src/headers/quoted_string.rs vendored Normal file
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//! Quoted String encoder.
use core::fmt::{self, Write};
use super::{rfc2047, utils, writer::EmailWriter};
/// Encode a string that may need to be quoted.
///
/// # Examples
///
/// ```rust
/// # use email_encoding::headers::writer::EmailWriter;
/// # fn main() -> core::fmt::Result {
/// {
/// let input = "John";
///
/// let mut output = String::new();
/// {
/// let mut writer = EmailWriter::new(&mut output, 0, 0, false);
/// email_encoding::headers::quoted_string::encode(input, &mut writer)?;
/// }
/// assert_eq!(output, "John");
/// }
///
/// {
/// let input = "John Smith";
///
/// let mut output = String::new();
/// {
/// let mut writer = EmailWriter::new(&mut output, 0, 0, false);
/// email_encoding::headers::quoted_string::encode(input, &mut writer)?;
/// }
/// assert_eq!(output, "\"John Smith\"");
/// }
///
/// {
/// let input = "Rogue \" User";
///
/// let mut output = String::new();
/// {
/// let mut writer = EmailWriter::new(&mut output, 0, 0, false);
/// email_encoding::headers::quoted_string::encode(input, &mut writer)?;
/// }
/// assert_eq!(output, "\"Rogue \\\" User\"");
/// }
///
/// {
/// let input = "Adrián";
///
/// let mut output = String::new();
/// {
/// let mut writer = EmailWriter::new(&mut output, 0, 0, false);
/// email_encoding::headers::quoted_string::encode(input, &mut writer)?;
/// }
/// assert_eq!(output, "=?utf-8?b?QWRyacOhbg==?=");
/// }
/// # Ok(())
/// # }
/// ```
pub fn encode(value: &str, w: &mut EmailWriter<'_>) -> fmt::Result {
#[derive(Debug)]
enum Strategy {
Plain,
Quoted,
QuotedEscaped,
Rfc2047,
}
let mut strategy = Strategy::Plain;
let mut bytes = value.as_bytes();
// Plain -> Quoted
while !bytes.is_empty() {
let byte = bytes[0];
if !byte.is_ascii_alphanumeric() && !matches!(byte, b'-' | b'_' | b'.') {
strategy = Strategy::Quoted;
break;
}
bytes = &bytes[1..];
}
// Quoted -> QuotedEscaped
while !bytes.is_empty() {
let byte = bytes[0];
if !byte.is_ascii_alphanumeric() && !matches!(byte, b' ' | b'-' | b'_' | b'.') {
strategy = Strategy::QuotedEscaped;
break;
}
bytes = &bytes[1..];
}
// QuotedEscaped -> Rfc2047
while !bytes.is_empty() {
let byte = bytes[0];
if !byte.is_ascii_alphanumeric()
&& !matches!(byte, b'\\' | b'"' | b' ' | b'-' | b'_' | b'.')
{
strategy = Strategy::Rfc2047;
break;
}
bytes = &bytes[1..];
}
match strategy {
Strategy::Plain => {
w.write_str(value)?;
}
Strategy::Quoted => {
w.write_char('"')?;
w.folding().write_str(value)?;
w.write_char('"')?;
}
Strategy::QuotedEscaped => {
w.write_char('"')?;
utils::write_escaped(value, &mut w.folding())?;
w.write_char('"')?;
}
Strategy::Rfc2047 => {
rfc2047::encode(value, w)?;
}
}
Ok(())
}
#[cfg(test)]
mod tests {
use alloc::string::String;
use pretty_assertions::assert_eq;
use super::*;
#[test]
fn plain() {
let mut s = String::new();
let line_len = s.len();
{
let mut w = EmailWriter::new(&mut s, line_len, 0, false);
encode("1234567890abcd", &mut w).unwrap();
}
assert_eq!(s, "1234567890abcd");
}
#[test]
fn quoted() {
let mut s = String::new();
let line_len = s.len();
{
let mut w = EmailWriter::new(&mut s, line_len, 0, false);
encode("1234567890 abcd", &mut w).unwrap();
}
assert_eq!(s, "\"1234567890 abcd\"");
}
#[test]
fn quoted_long() {
let mut s = String::new();
let line_len = s.len();
{
let mut w = EmailWriter::new(&mut s, line_len, 0, false);
encode("1234567890 abcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcd", &mut w).unwrap();
}
assert_eq!(s, concat!(
"\"1234567890\r\n",
" abcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcd\""
));
}
#[test]
fn quoted_escaped() {
let mut s = String::new();
let line_len = s.len();
{
let mut w = EmailWriter::new(&mut s, line_len, 0, false);
encode("12345\\67890 ab\"cd", &mut w).unwrap();
}
assert_eq!(s, "\"12345\\\\67890 ab\\\"cd\"");
}
// TODO: get it working for the quoted escaped strategy
// #[test]
// fn quoted_escaped_long() {
// let mut s = String::new();
// let line_len = s.len();
//
// {
// let mut w = EmailWriter::new(&mut s, line_len, 0, false, false);
// encode("12345\\67890 ab\"cdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcd", &mut w).unwrap();
// }
//
// assert_eq!(s, concat!(
// "\"12345\\\\67890\r\n",
// " ab\\\"cdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcd\""
// ));
// }
#[test]
fn rfc2047() {
let mut s = String::new();
let line_len = s.len();
{
let mut w = EmailWriter::new(&mut s, line_len, 0, false);
encode("12345\\67890 perché ab\"cd", &mut w).unwrap();
}
assert_eq!(s, "=?utf-8?b?MTIzNDVcNjc4OTAgcGVyY2jDqSBhYiJjZA==?=");
}
}

170
vendor/email-encoding/src/headers/rfc2047.rs vendored Normal file
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//! [RFC 2047] encoder.
//!
//! [RFC 2047]: https://datatracker.ietf.org/doc/html/rfc2047
use core::fmt::{self, Write};
use super::{utils, writer::EmailWriter, MAX_LINE_LEN};
const ENCODING_START_PREFIX: &str = "=?utf-8?b?";
const ENCODING_END_SUFFIX: &str = "?=";
/// Encode a string via RFC 2047.
///
/// # Examples
///
/// ```rust
/// # use email_encoding::headers::writer::EmailWriter;
/// # fn main() -> core::fmt::Result {
/// let input = "Adrián";
///
/// let mut output = String::new();
/// {
/// let mut writer = EmailWriter::new(&mut output, 0, 0, false);
/// email_encoding::headers::rfc2047::encode(input, &mut writer)?;
/// }
/// assert_eq!(output, "=?utf-8?b?QWRyacOhbg==?=");
/// # Ok(())
/// # }
/// ```
pub fn encode(mut s: &str, w: &mut EmailWriter<'_>) -> fmt::Result {
let mut wrote = false;
while !s.is_empty() {
let remaining_line_len = MAX_LINE_LEN.saturating_sub(
ENCODING_START_PREFIX.len() + ENCODING_END_SUFFIX.len() + w.line_len() + "\r\n".len(),
);
let unencoded_remaining_line_len = remaining_line_len / 4 * 3;
let mut word =
utils::truncate_to_char_boundary(s, unencoded_remaining_line_len.min(s.len()));
if word.is_empty() {
if wrote || w.has_spaces() {
// No space remaining on this line, go to a new one
w.new_line()?;
if !w.has_spaces() {
// The last write before this call to `encode` most
// likely wasn't rfc2047 so we must write a "soft"
// space to let the decoder know we're still within the
// same header
w.space();
}
continue;
}
// No space remaining, but going to a new line will require us
// to introduce a new space, which will mess up things even more.
word = &s[..s.chars().next().expect("`s` is empty").len_utf8()];
}
// Write the prefix
w.write_str(ENCODING_START_PREFIX)?;
// Encode `word`
let encoder = base64::display::Base64Display::new(
word.as_bytes(),
&base64::engine::general_purpose::STANDARD,
);
write!(w, "{}", encoder)?;
// Write the suffix
w.write_str(ENCODING_END_SUFFIX)?;
s = &s[word.len()..];
wrote = true;
}
Ok(())
}
#[cfg(test)]
mod tests {
use alloc::string::String;
use pretty_assertions::assert_eq;
use super::*;
#[test]
fn empty() {
let mut s = String::new();
let line_len = s.len();
{
let mut w = EmailWriter::new(&mut s, line_len, 0, false);
encode("", &mut w).unwrap();
}
assert_eq!(s, "");
}
#[test]
fn basic() {
let mut s = String::new();
let line_len = s.len();
{
let mut w = EmailWriter::new(&mut s, line_len, 0, false);
encode("abcd", &mut w).unwrap();
}
assert_eq!(s, "=?utf-8?b?YWJjZA==?=");
}
#[test]
fn basic_nopad() {
let mut s = String::new();
let line_len = s.len();
{
let mut w = EmailWriter::new(&mut s, line_len, 0, false);
encode("abcdef", &mut w).unwrap();
}
assert_eq!(s, "=?utf-8?b?YWJjZGVm?=");
}
#[test]
fn long() {
let mut s = String::new();
let line_len = s.len();
{
let mut w = EmailWriter::new(&mut s, line_len, 0, false);
encode(&"lettre".repeat(20), &mut w).unwrap();
}
assert_eq!(
s,
concat!(
"=?utf-8?b?bGV0dHJlbGV0dHJlbGV0dHJlbGV0dHJlbGV0dHJlbGV0dHJlbGV0dHJlbGV0?=\r\n",
" =?utf-8?b?dHJlbGV0dHJlbGV0dHJlbGV0dHJlbGV0dHJlbGV0dHJlbGV0dHJlbGV0dHJl?=\r\n",
" =?utf-8?b?bGV0dHJlbGV0dHJlbGV0dHJlbGV0dHJlbGV0dHJl?="
)
);
}
#[test]
fn long_encoded() {
let mut s = String::new();
let line_len = s.len();
{
let mut w = EmailWriter::new(&mut s, line_len, 0, false);
encode(&"hétérogénéité".repeat(16), &mut w).unwrap();
}
assert_eq!(
s,
concat!(
"=?utf-8?b?aMOpdMOpcm9nw6luw6lpdMOpaMOpdMOpcm9nw6luw6lpdMOpaMOpdMOpcm9n?=\r\n",
" =?utf-8?b?w6luw6lpdMOpaMOpdMOpcm9nw6luw6lpdMOpaMOpdMOpcm9nw6luw6lpdMOp?=\r\n",
" =?utf-8?b?aMOpdMOpcm9nw6luw6lpdMOpaMOpdMOpcm9nw6luw6lpdMOpaMOpdMOpcm9n?=\r\n",
" =?utf-8?b?w6luw6lpdMOpaMOpdMOpcm9nw6luw6lpdMOpaMOpdMOpcm9nw6luw6lpdMOp?=\r\n",
" =?utf-8?b?aMOpdMOpcm9nw6luw6lpdMOpaMOpdMOpcm9nw6luw6lpdMOpaMOpdMOpcm9n?=\r\n",
" =?utf-8?b?w6luw6lpdMOpaMOpdMOpcm9nw6luw6lpdMOpaMOpdMOpcm9nw6luw6lpdMOp?=\r\n",
" =?utf-8?b?aMOpdMOpcm9nw6luw6lpdMOp?=",
)
);
}
}

385
vendor/email-encoding/src/headers/rfc2231.rs vendored Normal file
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//! [RFC 2231] encoder.
//!
//! [RFC 2231]: https://datatracker.ietf.org/doc/html/rfc2231
use core::fmt::{self, Write};
use super::{hex_encoding, utils, writer::EmailWriter, MAX_LINE_LEN};
/// Encode a string via RFC 2231.
///
/// # Examples
///
/// ```rust
/// # use email_encoding::headers::writer::EmailWriter;
/// # fn main() -> core::fmt::Result {
/// {
/// let input = "invoice.pdf";
///
/// let mut output = String::new();
/// {
/// let mut writer = EmailWriter::new(&mut output, 0, 0, false);
/// email_encoding::headers::rfc2231::encode("filename", input, &mut writer)?;
/// }
/// assert_eq!(output, "filename=\"invoice.pdf\"");
/// }
///
/// {
/// let input = "invoice_2022_06_04_letshaveaverylongfilenamewhynotemailcanhandleit.pdf";
///
/// let mut output = String::new();
/// {
/// let mut writer = EmailWriter::new(&mut output, 0, 0, false);
/// email_encoding::headers::rfc2231::encode("filename", input, &mut writer)?;
/// }
/// assert_eq!(
/// output,
/// concat!(
/// "\r\n",
/// " filename*0=\"invoice_2022_06_04_letshaveaverylongfilenamewhynotemailcanha\";\r\n",
/// " filename*1=\"ndleit.pdf\""
/// )
/// );
/// }
///
/// {
/// let input = "faktúra.pdf";
///
/// let mut output = String::new();
/// {
/// let mut writer = EmailWriter::new(&mut output, 0, 0, false);
/// email_encoding::headers::rfc2231::encode("filename", input, &mut writer)?;
/// }
/// assert_eq!(
/// output,
/// concat!(
/// "\r\n",
/// " filename*0*=utf-8''fakt%C3%BAra.pdf"
/// )
/// );
/// }
/// # Ok(())
/// # }
/// ```
pub fn encode(key: &str, mut value: &str, w: &mut EmailWriter<'_>) -> fmt::Result {
assert!(
utils::str_is_ascii_alphanumeric(key),
"`key` must only be composed of ascii alphanumeric chars"
);
assert!(
key.len() + "*12*=utf-8'';".len() < MAX_LINE_LEN,
"`key` must not be too long to cause the encoder to overflow the max line length"
);
if utils::str_is_ascii_printable(value) {
// Can be written normally (Parameter Value Continuations)
let quoted_plain_combined_len = key.len() + "=\"".len() + value.len() + "\"\r\n".len();
if w.line_len() + quoted_plain_combined_len <= MAX_LINE_LEN {
// Fits line
w.write_str(key)?;
w.write_char('=')?;
w.write_char('"')?;
utils::write_escaped(value, w)?;
w.write_char('"')?;
} else {
// Doesn't fit line
w.new_line()?;
w.forget_spaces();
let mut i = 0_usize;
loop {
write!(w, " {}*{}=\"", key, i)?;
let remaining_len = MAX_LINE_LEN - w.line_len() - "\"\r\n".len();
let value_ =
utils::truncate_to_char_boundary(value, remaining_len.min(value.len()));
value = &value[value_.len()..];
utils::write_escaped(value_, w)?;
w.write_char('"')?;
if value.is_empty() {
// End of value
break;
}
// End of line
w.write_char(';')?;
w.new_line()?;
i += 1;
}
}
} else {
// Needs encoding (Parameter Value Character Set and Language Information)
w.new_line()?;
w.forget_spaces();
let mut i = 0_usize;
loop {
write!(w, " {}*{}*=", key, i)?;
if i == 0 {
w.write_str("utf-8''")?;
}
let mut chars = value.chars();
while w.line_len() < MAX_LINE_LEN - "=xx=xx=xx=xx;\r\n".len() {
match chars.next() {
Some(c) => {
hex_encoding::percent_encode_char(w, c)?;
value = chars.as_str();
}
None => {
break;
}
}
}
if value.is_empty() {
// End of value
break;
}
// End of line
w.write_char(';')?;
w.new_line()?;
i += 1;
}
}
Ok(())
}
#[cfg(test)]
mod tests {
use alloc::{borrow::ToOwned, string::String};
use pretty_assertions::assert_eq;
use super::*;
#[test]
fn empty() {
let mut s = "Content-Disposition: attachment;".to_owned();
let line_len = 1;
{
let mut w = EmailWriter::new(&mut s, line_len, 0, true);
w.space();
encode("filename", "", &mut w).unwrap();
}
assert_eq!(s, concat!("Content-Disposition: attachment; filename=\"\""));
}
#[test]
fn parameter() {
let mut s = "Content-Disposition: attachment;".to_owned();
let line_len = 1;
{
let mut w = EmailWriter::new(&mut s, line_len, 0, true);
w.space();
encode("filename", "duck.txt", &mut w).unwrap();
}
assert_eq!(
s,
concat!("Content-Disposition: attachment; filename=\"duck.txt\"")
);
}
#[test]
fn parameter_to_escape() {
let mut s = "Content-Disposition: attachment;".to_owned();
let line_len = 1;
{
let mut w = EmailWriter::new(&mut s, line_len, 0, true);
w.space();
encode("filename", "du\"ck\\.txt", &mut w).unwrap();
}
assert_eq!(
s,
concat!("Content-Disposition: attachment; filename=\"du\\\"ck\\\\.txt\"")
);
}
#[test]
fn parameter_long() {
let mut s = "Content-Disposition: attachment;".to_owned();
let line_len = s.len();
{
let mut w = EmailWriter::new(&mut s, line_len, 0, true);
w.space();
encode(
"filename",
"a-fairly-long-filename-just-to-see-what-happens-when-we-encode-it-will-the-client-be-able-to-handle-it.txt",
&mut w,
)
.unwrap();
}
assert_eq!(
s,
concat!(
"Content-Disposition: attachment;\r\n",
" filename*0=\"a-fairly-long-filename-just-to-see-what-happens-when-we-enco\";\r\n",
" filename*1=\"de-it-will-the-client-be-able-to-handle-it.txt\""
)
);
}
#[test]
fn parameter_special() {
let mut s = "Content-Disposition: attachment;".to_owned();
let line_len = s.len();
{
let mut w = EmailWriter::new(&mut s, line_len, 0, true);
w.space();
encode("filename", "caffè.txt", &mut w).unwrap();
}
assert_eq!(
s,
concat!(
"Content-Disposition: attachment;\r\n",
" filename*0*=utf-8''caff%C3%A8.txt"
)
);
}
#[test]
fn parameter_special_long() {
let mut s = "Content-Disposition: attachment;".to_owned();
let line_len = s.len();
{
let mut w = EmailWriter::new(&mut s, line_len, 0, true);
w.space();
encode(
"filename",
"testing-to-see-what-happens-when-📕📕📕📕📕📕📕📕📕📕📕-are-placed-on-the-boundary.txt",
&mut w,
)
.unwrap();
}
assert_eq!(
s,
concat!(
"Content-Disposition: attachment;\r\n",
" filename*0*=utf-8''testing-to-see-what-happens-when-%F0%9F%93%95;\r\n",
" filename*1*=%F0%9F%93%95%F0%9F%93%95%F0%9F%93%95%F0%9F%93%95;\r\n",
" filename*2*=%F0%9F%93%95%F0%9F%93%95%F0%9F%93%95%F0%9F%93%95;\r\n",
" filename*3*=%F0%9F%93%95%F0%9F%93%95-are-placed-on-the-bound;\r\n",
" filename*4*=ary.txt"
)
);
}
#[test]
fn parameter_special_long_part2() {
let mut s = "Content-Disposition: attachment;".to_owned();
let line_len = s.len();
{
let mut w = EmailWriter::new(&mut s, line_len, 0, true);
w.space();
encode(
"filename",
"testing-to-see-what-happens-when-books-are-placed-in-the-second-part-📕📕📕📕📕📕📕📕📕📕📕.txt",
&mut w,
)
.unwrap();
}
assert_eq!(
s,
concat!(
"Content-Disposition: attachment;\r\n",
" filename*0*=utf-8''testing-to-see-what-happens-when-books-ar;\r\n",
" filename*1*=e-placed-in-the-second-part-%F0%9F%93%95%F0%9F%93%95;\r\n",
" filename*2*=%F0%9F%93%95%F0%9F%93%95%F0%9F%93%95%F0%9F%93%95;\r\n",
" filename*3*=%F0%9F%93%95%F0%9F%93%95%F0%9F%93%95%F0%9F%93%95;\r\n",
" filename*4*=%F0%9F%93%95.txt"
)
);
}
#[test]
fn parameter_dont_split_on_hex_boundary() {
let base_header = "Content-Disposition: attachment;".to_owned();
let line_len = base_header.len();
for start_offset in &["", "x", "xx", "xxx"] {
let mut filename = (*start_offset).to_owned();
for i in 1..256 {
// 'Ü' results in two hex chars %C3%9C
filename.push('Ü');
let mut output = base_header.clone();
{
let mut w = EmailWriter::new(&mut output, line_len, 0, true);
encode("filename", &filename, &mut w).unwrap();
}
// look for all hex encoded chars
let output_len = output.len();
let mut found_hex_count = 0;
for (percent_sign_idx, _) in output.match_indices('%') {
assert!(percent_sign_idx + 3 <= output_len);
// verify we get the expected hex sequence for an 'Ü'
let must_be_hex = &output[percent_sign_idx + 1..percent_sign_idx + 3];
assert!(
must_be_hex == "C3" || must_be_hex == "9C",
"unexpected hex char: {}",
must_be_hex
);
found_hex_count += 1;
}
// verify the number of hex encoded chars adds up
let number_of_chars_in_hex = 2;
assert_eq!(found_hex_count, i * number_of_chars_in_hex);
// verify max line length
let mut last_newline_pos = 0;
for (newline_idx, _) in output.match_indices("\r\n") {
let line_length = newline_idx - last_newline_pos;
assert!(
line_length < MAX_LINE_LEN,
"expected line length exceeded: {} > {}",
line_length,
MAX_LINE_LEN
);
last_newline_pos = newline_idx;
}
// ensure there was at least one newline
assert_ne!(0, last_newline_pos);
}
}
}
#[test]
#[should_panic(expected = "`key` must only be composed of ascii alphanumeric chars")]
fn non_ascii_key() {
let mut s = String::new();
let mut w = EmailWriter::new(&mut s, 0, 0, true);
let _ = encode("📬", "", &mut w);
}
}

84
vendor/email-encoding/src/headers/utils.rs vendored Normal file
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use core::fmt::{self, Write};
pub(super) fn str_is_ascii_alphanumeric(s: &str) -> bool {
s.bytes().all(|c| c.is_ascii_alphanumeric())
}
pub(super) const fn char_is_ascii_alphanumeric_plus(c: char) -> bool {
c.is_ascii_alphanumeric() || matches!(c, '-' | '_' | '.')
}
pub(super) fn str_is_ascii_printable(s: &str) -> bool {
s.bytes().all(char_is_ascii_printable)
}
const fn char_is_ascii_printable(c: u8) -> bool {
matches!(c, b' '..=b'~')
}
pub(super) fn write_escaped(s: &str, w: &mut impl Write) -> fmt::Result {
debug_assert!(s.is_ascii());
for b in s.bytes() {
match b {
b'\\' => {
w.write_str("\\\\")?;
}
b'"' => {
w.write_str("\\\"")?;
}
b => {
w.write_char(char::from(b))?;
}
}
}
Ok(())
}
pub(super) fn truncate_to_char_boundary(s: &str, mut max: usize) -> &str {
assert!(max <= s.len());
while !s.is_char_boundary(max) {
max -= 1;
}
&s[..max]
}
#[cfg(test)]
mod tests {
use pretty_assertions::assert_eq;
use super::*;
#[test]
fn truncate_ascii() {
assert_eq!(truncate_to_char_boundary("12345678", 4), "1234");
}
#[test]
fn truncate0_ascii() {
assert_eq!(truncate_to_char_boundary("12345678", 0), "");
}
#[test]
fn truncate_utf8() {
assert_eq!(truncate_to_char_boundary("📬📬📬📬📬📬", 8), "📬📬");
}
#[test]
fn truncate0_utf8() {
assert_eq!(truncate_to_char_boundary("📬📬📬📬📬📬", 0), "");
}
#[test]
fn truncate_boundary_utf8() {
assert_eq!(truncate_to_char_boundary("📬📬📬📬📬📬", 9), "📬📬");
}
#[test]
#[should_panic]
fn truncate_out_of_bounds() {
let _ = truncate_to_char_boundary("12345678", 16);
}
}

363
vendor/email-encoding/src/headers/writer.rs vendored Normal file
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//! Utilities for writing email headers to a [`Write`]r.
//!
//! [`Write`]: core::fmt::Write
use core::fmt::{self, Write};
use super::MAX_LINE_LEN;
/// Wrapper around [`Write`] that remembers the length of the
/// last line written to it.
///
/// [`Write`]: core::fmt::Write
pub struct EmailWriter<'a> {
writer: &'a mut dyn Write,
line_len: usize,
spaces: usize,
can_go_to_new_line_now: bool,
}
impl<'a> EmailWriter<'a> {
/// Construct a new `EmailWriter`.
///
/// * `line_len` is the length of the last line in `writer`.
/// * `spaces` the number of spaces that must be written before
/// the next write.
/// * `can_go_to_new_line_now` is whether the current line can
/// be wrapped now or not.
pub fn new(
writer: &'a mut dyn Write,
line_len: usize,
spaces: usize,
can_go_to_new_line_now: bool,
) -> Self {
Self {
writer,
line_len,
spaces,
can_go_to_new_line_now,
}
}
/// Go to a new line and reset the `line_len` to `0`.
pub fn new_line(&mut self) -> fmt::Result {
self.writer.write_str("\r\n")?;
self.line_len = 0;
self.can_go_to_new_line_now = false;
Ok(())
}
/// Write a space which _might_ get wrapped to a new line on the next write.
pub fn space(&mut self) {
self.spaces += 1;
}
/// Forget all buffered spaces
pub(super) fn forget_spaces(&mut self) {
self.spaces = 0;
}
pub(super) fn has_spaces(&mut self) -> bool {
self.spaces >= 1
}
/// Get the length in bytes of the last line written to the inner writer.
pub fn line_len(&self) -> usize {
self.line_len
}
/// Get the length in bytes of the last line written to the inner writer
/// plus the spaces which might be written to in on the next write call.
pub fn projected_line_len(&self) -> usize {
self.line_len + self.spaces
}
/// Get a [`Write`]r which automatically line folds text written to it.
///
/// [`Write`]: core::fmt::Write
pub fn folding<'b>(&'b mut self) -> FoldingEmailWriter<'a, 'b> {
FoldingEmailWriter { writer: self }
}
fn write_spaces(&mut self) -> fmt::Result {
while self.spaces > 0 {
self.writer.write_char(' ')?;
self.line_len += 1;
self.spaces -= 1;
}
Ok(())
}
}
impl Write for EmailWriter<'_> {
fn write_str(&mut self, s: &str) -> fmt::Result {
self.write_spaces()?;
let s_after = s.trim_end_matches(' ');
self.spaces += s.len() - s_after.len();
if !s_after.is_empty() {
self.writer.write_str(s_after)?;
self.line_len += s_after.len();
self.can_go_to_new_line_now = true;
}
Ok(())
}
fn write_char(&mut self, c: char) -> fmt::Result {
if c == ' ' {
self.spaces += 1;
} else {
self.write_spaces()?;
self.can_go_to_new_line_now = true;
self.writer.write_char(c)?;
self.line_len += c.len_utf8();
}
Ok(())
}
}
impl Drop for EmailWriter<'_> {
fn drop(&mut self) {
let _ = self.write_spaces();
}
}
/// Wrapper around [`Write`] that remembers the length of the
/// last line and automatically line folds text written to it.
///
/// [`Write`]: core::fmt::Write
pub struct FoldingEmailWriter<'a, 'b> {
writer: &'b mut EmailWriter<'a>,
}
impl Write for FoldingEmailWriter<'_, '_> {
fn write_str(&mut self, mut s: &str) -> fmt::Result {
while !s.is_empty() {
if s.starts_with(' ') {
self.writer.space();
s = &s[1..];
continue;
}
let (start, end) = s.find(' ').map_or((s, ""), |i| s.split_at(i));
if self.writer.can_go_to_new_line_now
&& self.writer.spaces >= 1
&& (self.writer.projected_line_len() + start.len()) > MAX_LINE_LEN
{
self.writer.new_line()?;
}
self.writer.write_str(start)?;
s = end;
}
Ok(())
}
fn write_char(&mut self, c: char) -> fmt::Result {
if c == ' ' {
self.writer.spaces += 1;
} else {
self.write_str(c.encode_utf8(&mut [0u8; 4]))?;
}
Ok(())
}
}
#[cfg(test)]
mod tests {
use alloc::borrow::ToOwned;
use pretty_assertions::assert_eq;
use super::*;
#[test]
fn wrap_immediate() {
let mut s =
"Subject: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA".to_owned();
let line_len = s.len();
{
let mut w = EmailWriter::new(&mut s, line_len, 0, true);
for _ in 0..16 {
w.folding().write_str("0123456789").unwrap();
}
}
assert_eq!(
s,
"Subject: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789",
);
}
#[test]
fn wrap_keeping_final_whitespace() {
let mut s = "Subject: AAAAAAAAAAAAAA".to_owned();
let line_len = s.len();
{
let mut w = EmailWriter::new(&mut s, line_len, 1, true);
w.folding().write_str("12345 ").unwrap();
w.new_line().unwrap();
w.folding().write_str("12345").unwrap();
}
assert_eq!(s, concat!("Subject: AAAAAAAAAAAAAA 12345\r\n", " 12345"));
}
#[test]
fn catch_space() {
let mut s = "Subject: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA".to_owned();
let line_len = s.len();
{
let mut w = EmailWriter::new(&mut s, line_len, 1, true);
w.folding().write_str("BBB ").unwrap();
w.folding().write_str("CCCCCCCCCCCCC").unwrap();
}
assert_eq!(
s,
concat!(
"Subject: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA BBB\r\n",
" CCCCCCCCCCCCC"
)
);
}
#[test]
fn catch_spaces() {
let mut s = "Subject: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA".to_owned();
let line_len = s.len();
{
let mut w = EmailWriter::new(&mut s, line_len, 1, true);
w.folding().write_str("BBB ").unwrap();
w.folding().write_str("CCCCCCCCCCCCC").unwrap();
}
assert_eq!(
s,
concat!(
"Subject: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA BBB\r\n",
" CCCCCCCCCCCCC"
)
);
}
#[test]
fn explicit_space() {
let mut s = "Subject: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA".to_owned();
let line_len = s.len();
{
let mut w = EmailWriter::new(&mut s, line_len, 1, true);
w.folding().write_str("BBB").unwrap();
w.space();
w.folding().write_str("CCCCCCCCCCCCC").unwrap();
}
assert_eq!(
s,
concat!(
"Subject: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA BBB\r\n",
" CCCCCCCCCCCCC"
)
);
}
#[test]
fn explicit_spaces() {
let mut s = "Subject: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA".to_owned();
let line_len = s.len();
{
let mut w = EmailWriter::new(&mut s, line_len, 1, true);
w.folding().write_str("BBB").unwrap();
w.space();
w.write_char(' ').unwrap();
w.space();
w.folding().write_str("CCCCCCCCCCCCC").unwrap();
}
assert_eq!(
s,
concat!(
"Subject: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA BBB\r\n",
" CCCCCCCCCCCCC"
)
);
}
#[test]
fn optional_breakpoint() {
let mut s = "Subject: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
.to_owned();
let line_len = s.len();
{
let mut w = EmailWriter::new(&mut s, line_len, 0, true);
w.space();
w.folding().write_str("BBBBBBBBBB").unwrap();
w.space();
w.folding().write_str("CCCCCCCCCC").unwrap();
}
assert_eq!(
s,
concat!(
"Subject: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\r\n",
" BBBBBBBBBB CCCCCCCCCC",
)
);
}
#[test]
fn double_spaces_issue_949() {
let mut s = "Subject: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA ".to_owned();
let line_len = s.len();
{
let mut w = EmailWriter::new(&mut s, line_len, 0, true);
w.folding().write_str("BBBBBBBBBBBBB ").unwrap();
crate::headers::rfc2047::encode("sélection", &mut w).unwrap();
}
assert_eq!(
s,
concat!(
"Subject: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA BBBBBBBBBBBBB\r\n",
" =?utf-8?b?c8OpbGVjdGlvbg==?=",
)
);
}
#[test]
fn double_spaces_issue_949_no_space() {
let mut s = "Subject: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA ".to_owned();
let line_len = s.len();
{
let mut w = EmailWriter::new(&mut s, line_len, 0, true);
w.folding().write_str("BBBBBBBBBBBBBBB").unwrap();
crate::headers::rfc2047::encode("sélection", &mut w).unwrap();
}
assert_eq!(
s,
concat!(
"Subject: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA BBBBBBBBBBBBBBB=?utf-8?b?cw==?=\r\n",
" =?utf-8?b?w6lsZWN0aW9u?=",
)
);
}
}

49
vendor/email-encoding/src/lib.rs vendored Normal file
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@@ -0,0 +1,49 @@
//! Low-level crate implementing various RFCs for encoding emails.
//! Used internally by [lettre].
//!
//! [lettre]: https://crates.io/crates/lettre
#![cfg_attr(not(feature = "std"), no_std)]
#![forbid(unsafe_code)]
#![deny(
unreachable_pub,
missing_copy_implementations,
trivial_casts,
trivial_numeric_casts,
unstable_features,
unused_import_braces,
rust_2018_idioms,
missing_docs,
rustdoc::broken_intra_doc_links,
clippy::string_add,
clippy::string_add_assign,
clippy::clone_on_ref_ptr,
clippy::verbose_file_reads,
clippy::unnecessary_self_imports,
clippy::string_to_string,
clippy::mem_forget,
clippy::cast_lossless,
clippy::inefficient_to_string,
clippy::inline_always,
clippy::linkedlist,
clippy::macro_use_imports,
clippy::manual_assert,
clippy::unnecessary_join,
clippy::wildcard_imports,
clippy::str_to_string,
clippy::empty_structs_with_brackets,
clippy::zero_sized_map_values,
clippy::manual_let_else,
clippy::semicolon_if_nothing_returned,
clippy::unnecessary_wraps,
clippy::doc_markdown,
clippy::explicit_iter_loop,
clippy::redundant_closure_for_method_calls,
// Rust 1.86: clippy::unnecessary_semicolon,
)]
#[cfg(test)]
extern crate alloc;
pub mod body;
pub mod headers;