commit 3170c0d208a6588cbea76f21e600a6323970c5b6
Author: Thomas Lindner <tom@dl6tom.de>
Date:   Thu Nov 21 21:36:09 2024 +0100

    inital implementation

diff --git a/.gitignore b/.gitignore
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..8769418
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[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"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..c486780
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,76 @@
+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()
+    );
+}