Struct detached_jws::decode::DeserializeJwsWriter

pub struct DeserializeJwsWriter<V: Write> { /* fields omitted */ }

A Write implementation deserialize and verify detached jws

Examples

extern crate detached_jws;
extern crate anyhow;
extern crate serde_json;

use std::io::{Write};
use anyhow::Result;
use serde_json::{Map, Value};
use detached_jws::{Verify, DeserializeJwsWriter};

#[derive(Default)]
pub struct DummyVerifier;

impl Verify for DummyVerifier {
    fn verify(&self, signature: &[u8]) -> Result<bool> {
        Ok(true)
    }
}

impl Write for DummyVerifier {
    fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
        Ok(buf.len())
    }
    fn flush(&mut self) -> std::io::Result<()> {
       Ok(())
    }
}

let jws =  "eyJhbGciOiJ0ZXN0X2FsZ29yaXRobSIsImN1c3RvbSI6ImN1c3RvbV92YWx1ZSJ9..ZXlKaGJHY2lPaUowWlhOMFgyRnNaMjl5YVhSb2JTSXNJbU4xYzNSdmJTSTZJbU4xYzNSdmJWOTJZV3gxWlNKOS5BQUVDQXdRRkJn".as_bytes();

let mut writer = DeserializeJwsWriter::new(&jws,
    |h| Some(DummyVerifier::default())
).unwrap();
writer.write_all(&[0, 1, 2, 3]);
writer.write_all(&[4, 5, 6]);

let verified_headers = writer.finish().unwrap();

assert_eq!(
    verified_headers.get("custom").unwrap().as_str().unwrap(),
    "custom_value"
);

Implementations

impl<V> DeserializeJwsWriter<V> where
    V: Verify, 

pub fn new<S>(jws: &impl AsRef<[u8]>, selector: S) -> Result<Self> where
    S: FnOnce(&Map<String, Value>) -> Option<V>, 

pub fn finish(&mut self) -> Result<Map<String, Value>>

Trait Implementations

impl<V> Write for DeserializeJwsWriter<V> where
    V: Verify, 

fn write(&mut self, buf: &[u8]) -> Result<usize>

Write a buffer into this writer, returning how many bytes were written.

fn flush(&mut self) -> Result<()>

Flush this output stream, ensuring that all intermediately buffered contents reach their destination.

pub fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> Result<usize, Error>

Like write, except that it writes from a slice of buffers.

pub fn is_write_vectored(&self) -> bool

🔬 This is a nightly-only experimental API. (can_vector)

Determines if this Writer has an efficient write_vectored implementation.

pub fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>

Attempts to write an entire buffer into this writer.

pub fn write_all_vectored(
    &mut self,
    bufs: &mut [IoSlice<'_>]
) -> Result<(), Error>

🔬 This is a nightly-only experimental API. (write_all_vectored)

Attempts to write multiple buffers into this writer.

pub fn write_fmt(&mut self, fmt: Arguments<'_>) -> Result<(), Error>

Writes a formatted string into this writer, returning any error encountered.

pub fn by_ref(&mut self) -> &mut Self

Creates a "by reference" adaptor for this instance of Write.