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use core::fmt::Write;
use super::ops::KeyOpsSet;
use crate::{
alg::KeyAlg,
buffer::{WriteBuffer, Writer},
error::Error,
};
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum JwkEncoderMode {
PublicKey,
SecretKey,
Thumbprint,
}
#[derive(Debug)]
pub struct JwkEncoder<'b> {
alg: Option<KeyAlg>,
buffer: &'b mut dyn WriteBuffer,
empty: bool,
mode: JwkEncoderMode,
}
impl<'b> JwkEncoder<'b> {
pub fn new<B: WriteBuffer>(
alg: Option<KeyAlg>,
buffer: &'b mut B,
mode: JwkEncoderMode,
) -> Result<Self, Error> {
Ok(Self {
alg,
buffer,
empty: true,
mode,
})
}
}
impl JwkEncoder<'_> {
pub fn alg(&self) -> Option<KeyAlg> {
self.alg
}
fn start_attr(&mut self, key: &str) -> Result<(), Error> {
let buffer = &mut *self.buffer;
if self.empty {
buffer.buffer_write(b"{\"")?;
self.empty = false;
} else {
buffer.buffer_write(b",\"")?;
}
buffer.buffer_write(key.as_bytes())?;
buffer.buffer_write(b"\":")?;
Ok(())
}
pub fn add_str(&mut self, key: &str, value: &str) -> Result<(), Error> {
self.start_attr(key)?;
let buffer = &mut *self.buffer;
buffer.buffer_write(b"\"")?;
buffer.buffer_write(value.as_bytes())?;
buffer.buffer_write(b"\"")?;
Ok(())
}
pub fn add_as_base64(&mut self, key: &str, value: &[u8]) -> Result<(), Error> {
self.start_attr(key)?;
let buffer = &mut *self.buffer;
buffer.buffer_write(b"\"")?;
write!(
Writer::from_buffer(&mut *buffer),
"{}",
base64::display::Base64Display::with_config(value, base64::URL_SAFE_NO_PAD)
)
.map_err(|_| err_msg!(Unexpected, "Error writing to JWK buffer"))?;
buffer.buffer_write(b"\"")?;
Ok(())
}
pub fn add_key_ops(&mut self, ops: impl Into<KeyOpsSet>) -> Result<(), Error> {
self.start_attr("key_ops")?;
let buffer = &mut *self.buffer;
for (idx, op) in ops.into().into_iter().enumerate() {
if idx > 0 {
buffer.buffer_write(b",\"")?;
} else {
buffer.buffer_write(b"\"")?;
}
buffer.buffer_write(op.as_str().as_bytes())?;
buffer.buffer_write(b"\"")?;
}
buffer.buffer_write(b"]")?;
Ok(())
}
pub fn mode(&self) -> JwkEncoderMode {
self.mode
}
pub fn is_public(&self) -> bool {
matches!(self.mode, JwkEncoderMode::PublicKey)
}
pub fn is_secret(&self) -> bool {
matches!(self.mode, JwkEncoderMode::SecretKey)
}
pub fn is_thumbprint(&self) -> bool {
matches!(self.mode, JwkEncoderMode::Thumbprint)
}
pub fn finalize(self) -> Result<(), Error> {
if !self.empty {
self.buffer.buffer_write(b"}")?;
}
Ok(())
}
}