Initial public commit

examples/offline_verify.rs

@@ -0,0 +1,32 @@
+//! Minimum-viable license check, entirely offline.
+//!
+//! Run with:
+//!
+//!     cargo run --example offline_verify --no-default-features --features offline -- <LIC1-...>
+//!
+//! In real life you'd embed the public key with `include_str!` — here we
+//! read it from an env var so the example has zero build-time coupling.
+
+use licensing_client::{PublicKeyPem, Verifier};
+use std::env;
+
+fn main() {
+    let pem = env::var("LICENSING_PUBKEY_PEM").expect("set LICENSING_PUBKEY_PEM to your issuer's public key");
+    let key = env::args()
+        .nth(1)
+        .expect("pass a license key as the first argument");
+
+    let verifier = Verifier::new(PublicKeyPem::from_str(&pem).expect("parse pubkey"));
+    match verifier.verify(&key) {
+        Ok(ok) => {
+            println!("license OK");
+            println!("  license_id = {}", ok.license_id);
+            println!("  product_id = {}", ok.product_id);
+            println!("  issued_at  = {}", ok.payload.issued_at);
+        }
+        Err(e) => {
+            eprintln!("license REJECTED: {e}");
+            std::process::exit(1);
+        }
+    }
+}