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Thomas Lindner 2024-11-21 21:36:09 +01:00
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/target

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Cargo.toml Normal file
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[package]
name = "vapid"
version = "0.1.0"
edition = "2021"
[dependencies]
base64-url = "3.0.0"
p256 = { version = "0.13.2", features = ["ecdsa", "pem"] }
rand_core = { version = "0.6.4", features = ["getrandom"] }
serde = { version = "1.0.215", features = ["derive"] }
serde_json = "1.0.133"

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use p256::ecdsa::signature::Signer;
use p256::ecdsa::{Signature, SigningKey};
use p256::pkcs8::{EncodePrivateKey, EncodePublicKey, LineEnding};
use rand_core::OsRng;
use serde::Serialize;
use std::error::Error;
#[derive(Serialize)]
struct JwtHeader {
typ: &'static str,
alg: &'static str,
}
#[derive(Serialize)]
struct JwtBody {
aud: String,
exp: u64,
sub: String,
}
struct Vapid {
key: SigningKey,
subject: String,
}
impl Vapid {
fn new(subject: &str) -> Self {
Vapid {
key: SigningKey::random(&mut OsRng),
subject: subject.to_string(),
}
}
fn get_authorization(&self, audience: &str) -> Result<String, Box<dyn Error>> {
let header = JwtHeader {
typ: "JWT",
alg: "ES256",
};
let header_encoded = base64_url::encode(&serde_json::to_vec(&header)?);
let body = JwtBody {
aud: audience.to_string(),
exp: 0,
sub: self.subject.clone(),
};
let body_encoded = base64_url::encode(&serde_json::to_vec(&body)?);
let message = format!("{}.{}", header_encoded, body_encoded);
let signature: Signature = self.key.sign(&message.as_bytes());
let signature_encoded = base64_url::encode(&signature.to_bytes());
let key_encoded = base64_url::encode(&self.key.verifying_key().to_sec1_bytes());
let authorization = format!(
"vapid t={}.{},k={}",
message, signature_encoded, key_encoded
);
Ok(authorization)
}
}
fn main() {
let vapid = Vapid::new("mailto:hostmaster@example.com");
println!("{}", *vapid.key.to_pkcs8_pem(LineEnding::LF).unwrap());
println!(
"{}",
vapid
.key
.verifying_key()
.to_public_key_pem(LineEnding::LF)
.unwrap()
);
println!(
"{}",
vapid.get_authorization("https://push.example.com").unwrap()
);
}