Holllo/webextension-native-messaging
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webextension-native-messaging
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# Generated by Cargo
# will have compiled files and executables
/target/
# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
Cargo.lock
# These are backup files generated by rustfmt
**/*.rs.bk

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# https://doc.rust-lang.org/cargo/reference/manifest.html
[package]
name = "web-ext-native-messaging"
description = "WebExtension native messaging with serde_json as the (de)serializer."
version = "0.1.0"
authors = ["Holllo <helllo@holllo.cc>"]
license = "MIT OR Apache-2.0"
repository = "https://github.com/Holllo/web-ext-native-messaging"
edition = "2018"
[lib]
path = "source/lib.rs"
[dependencies]
byteorder = "1.4.3"
serde = { version = "1.0", features = ["derive"] }
serde_json = "1.0"
thiserror = "1.0"

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MIT License
Copyright (c) 2021 Holllo <helllo@holllo.cc>
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# web-ext-native-messaging
WebExtension native messaging with serde_json as the (de)serializer.
## Documentation
See [docs.rs](https://docs.rs/web-ext-native-messaging) for documentation.
## License
Licensed under either of
- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or https://www.apache.org/licenses/LICENSE-2.0)
- MIT license ([LICENSE-MIT](LICENSE-MIT) or https://opensource.org/licenses/MIT)
at your option.
#### Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.

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#![forbid(unsafe_code)]
#![warn(missing_docs, clippy::missing_docs_in_private_items)]
//! # web-ext-native-messaging
//!
//! WebExtension [native messaging] with [`serde_json`] as the (de)serializer.
//!
//! [native messaging]: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Native_messaging#app_side
//!
//! ## Reading
//!
//! In your web extension:
//!
//! ```js
//! const port = browser.runtime.connectNative('native executable');
//!
//! port.postMessage('Hey, there!');
//! ```
//!
//! Then in your native executable:
//!
//! ```rust,no_run
//! use web_ext_native_messaging::read_message;
//!
//! let message = read_message::<String>().unwrap();
//! println!("{}", message);
//! ```
//!
//! ## Writing
//!
//! In your web extension:
//!
//! ```js
//! const port = browser.runtime.connectNative('native executable');
//!
//! port.onMessage.addListener((message) => {
//! console.log(message);
//! });
//! ```
//!
//! Then in your native executable:
//!
//! ```rust,no_run
//! use web_ext_native_messaging::write_message;
//!
//! let message = "Hey, there!".to_string();
//! write_message(&message).unwrap();
//! ```
//!
//! See the [native messaging documentation] for precise instructions on how to
//! send and receive messages.
//!
//! [native messaging documentation]: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Native_messaging
use std::{
convert::TryInto,
io::{Read, Write},
};
use byteorder::{NativeEndian, ReadBytesExt, WriteBytesExt};
/// All possible errors that can happen with reading or writing messages.
#[derive(Debug, thiserror::Error)]
pub enum MessagingError {
/// Infallible errors.
#[error(transparent)]
Infallible(#[from] std::convert::Infallible),
#[error(transparent)]
/// IO errors.
Io(#[from] std::io::Error),
#[error(transparent)]
/// JSON (de)serialization errors.
Json(#[from] serde_json::Error),
/// Integer parsing errors.
#[error(transparent)]
TryFromInt(#[from] std::num::TryFromIntError),
}
/// Read message function with a generic [`Read`]er so that we can test it
/// without having to actually use standard in/out.
pub(crate) fn generic_read_message<D, R>(
mut reader: R,
) -> Result<D, MessagingError>
where
D: for<'a> serde::Deserialize<'a>,
R: Read,
{
let message_length = reader.read_u32::<NativeEndian>()?.try_into()?;
let message_bytes = reader.take(message_length);
serde_json::from_reader(message_bytes).map_err(Into::into)
}
/// Attempts to read a message from the program's stdin in the
/// [native messaging] format.
///
/// [native messaging]: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Native_messaging#app_side
pub fn read_message<D>() -> Result<D, MessagingError>
where
D: for<'a> serde::Deserialize<'a>,
{
let stdin = std::io::stdin();
let stdin = stdin.lock();
generic_read_message(stdin)
}
/// Write message function with a generic [`Write`]r so that we can test it
/// without having to actually use standard in/out.
pub(crate) fn generic_write_message<S, W>(
message: &S,
mut writer: W,
) -> Result<(), MessagingError>
where
S: serde::Serialize,
W: Write,
{
let message_bytes = serde_json::to_vec(message)?;
let message_length = message_bytes.len().try_into()?;
writer.write_u32::<NativeEndian>(message_length)?;
writer.write_all(&message_bytes)?;
writer.flush().map_err(MessagingError::Io)
}
/// Attempts to write a message to the program's stdout in the
/// [native messaging] format.
///
/// [native messaging]: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Native_messaging#app_side
pub fn write_message<S>(message: &S) -> Result<(), MessagingError>
where
S: serde::Serialize,
{
let stdout = std::io::stdout();
let stdout = stdout.lock();
generic_write_message(message, stdout)
}
#[cfg(test)]
pub(crate) mod tests {
use crate::{generic_read_message, generic_write_message, MessagingError};
#[derive(Debug, serde::Deserialize, serde::Serialize, PartialEq)]
struct Message {
text: String,
}
#[test]
fn test_messaging() -> Result<(), MessagingError> {
let test_message = Message {
text: "This is a test".to_string(),
};
// Create a buffer that will act as both the reader and writer
// (i.e. stdin and stdout).
let mut buffer: Vec<u8> = vec![];
// Write the message to the buffer.
generic_write_message(&test_message, &mut buffer)?;
// Then read the message, we get `std::io::Read` by dereferencing the
// `Vec<u8>` to `&[u8]`.
let message = generic_read_message::<Message, _>(&*buffer)?;
assert_eq!(message, test_message);
Ok(())
}
}