feat: implement LicenseValidator with Ed25519 signature verification

- Validates payload.signature license tokens using Ed25519 public key - Parses tier, features, limits, timestamps from JSON payload - Rejects expired and tampered tokens - Unit tests for valid, expired, and tampered license scenarios
2026-04-07 23:08:04 +02:00
parent 2f8fcb866e
commit b5cf35ef9a
2 changed files with 179 additions and 0 deletions
--- a/cameleer3-server-app/src/test/java/com/cameleer3/server/core/license/LicenseValidatorTest.java
+++ b/cameleer3-server-app/src/test/java/com/cameleer3/server/core/license/LicenseValidatorTest.java
@@ -0,0 +1,87 @@
+package com.cameleer3.server.core.license;
+
+import org.junit.jupiter.api.Test;
+
+import java.security.*;
+import java.security.spec.NamedParameterSpec;
+import java.time.Instant;
+import java.time.temporal.ChronoUnit;
+import java.util.Base64;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+class LicenseValidatorTest {
+
+    private KeyPair generateKeyPair() throws Exception {
+        KeyPairGenerator kpg = KeyPairGenerator.getInstance("Ed25519");
+        return kpg.generateKeyPair();
+    }
+
+    private String sign(PrivateKey key, String payload) throws Exception {
+        Signature signer = Signature.getInstance("Ed25519");
+        signer.initSign(key);
+        signer.update(payload.getBytes());
+        return Base64.getEncoder().encodeToString(signer.sign());
+    }
+
+    @Test
+    void validate_validLicense_returnsLicenseInfo() throws Exception {
+        KeyPair kp = generateKeyPair();
+        String publicKeyBase64 = Base64.getEncoder().encodeToString(kp.getPublic().getEncoded());
+        LicenseValidator validator = new LicenseValidator(publicKeyBase64);
+
+        Instant expires = Instant.now().plus(365, ChronoUnit.DAYS);
+        String payload = """
+                {"tier":"HIGH","features":["topology","lineage","debugger"],"limits":{"max_agents":50,"retention_days":90},"iat":%d,"exp":%d}
+                """.formatted(Instant.now().getEpochSecond(), expires.getEpochSecond()).trim();
+        String signature = sign(kp.getPrivate(), payload);
+        String token = Base64.getEncoder().encodeToString(payload.getBytes()) + "." + signature;
+
+        LicenseInfo info = validator.validate(token);
+
+        assertThat(info.tier()).isEqualTo("HIGH");
+        assertThat(info.hasFeature(Feature.debugger)).isTrue();
+        assertThat(info.hasFeature(Feature.replay)).isFalse();
+        assertThat(info.getLimit("max_agents", 0)).isEqualTo(50);
+        assertThat(info.isExpired()).isFalse();
+    }
+
+    @Test
+    void validate_expiredLicense_throwsException() throws Exception {
+        KeyPair kp = generateKeyPair();
+        String publicKeyBase64 = Base64.getEncoder().encodeToString(kp.getPublic().getEncoded());
+        LicenseValidator validator = new LicenseValidator(publicKeyBase64);
+
+        Instant past = Instant.now().minus(1, ChronoUnit.DAYS);
+        String payload = """
+                {"tier":"LOW","features":["topology"],"limits":{},"iat":%d,"exp":%d}
+                """.formatted(past.minus(30, ChronoUnit.DAYS).getEpochSecond(), past.getEpochSecond()).trim();
+        String signature = sign(kp.getPrivate(), payload);
+        String token = Base64.getEncoder().encodeToString(payload.getBytes()) + "." + signature;
+
+        assertThatThrownBy(() -> validator.validate(token))
+                .isInstanceOf(IllegalArgumentException.class)
+                .hasMessageContaining("expired");
+    }
+
+    @Test
+    void validate_tamperedPayload_throwsException() throws Exception {
+        KeyPair kp = generateKeyPair();
+        String publicKeyBase64 = Base64.getEncoder().encodeToString(kp.getPublic().getEncoded());
+        LicenseValidator validator = new LicenseValidator(publicKeyBase64);
+
+        String payload = """
+                {"tier":"LOW","features":["topology"],"limits":{},"iat":0,"exp":9999999999}
+                """.trim();
+        String signature = sign(kp.getPrivate(), payload);
+
+        // Tamper with payload
+        String tampered = payload.replace("LOW", "BUSINESS");
+        String token = Base64.getEncoder().encodeToString(tampered.getBytes()) + "." + signature;
+
+        assertThatThrownBy(() -> validator.validate(token))
+                .isInstanceOf(SecurityException.class)
+                .hasMessageContaining("signature");
+    }
+}