Modify rule S5659: Add nimbus sample

docs/header_names/allowed_framework_names.adoc

@@ -50,6 +50,7 @@
 * Spring Data Redis
 * SQLCipher
 * Thymeleaf
+* Nimbus
 // JS
 * Flow.js
 * Node.js

rules/S5659/java/how-to-fix-it/nimbus.adoc

@@ -0,0 +1,63 @@
+== How to fix it in Nimbus
+
+=== Code examples
+
+include::../../common/fix/code-rationale.adoc[]
+
+==== Noncompliant code example
+
+[source,java,diff-id=21,diff-type=noncompliant]
+----
+import com.nimbusds.jwt.PlainJWT;
+
+public void encode(JWTClaimsSet claimsSet) {
+    PlainJWT jwt = new PlainJWT(claimsSet); // Noncompliant
+}
+----
+
+[source,java,diff-id=22,diff-type=noncompliant]
+----
+import com.nimbusds.jwt.PlainJWT;
+
+public void decode(String jwtString) {
+    PlainJWT jwt = PlainJWT.parse(jwtString); // Noncompliant
+}
+----
+
+==== Compliant solution
+
+[source,java,diff-id=21,diff-type=compliant]
+----
+import com.nimbusds.jwt.SignedJWT;
+
+public void encode(JWTClaimsSet claimsSet) {
+    SignedJWT jwt = new SignedJWT(new JWSHeader(JWSAlgorithm.HS256), claimsSet);
+    jwt.sign(new MACSigner(sharedSecret));
+}
+----
+
+[source,java,diff-id=22,diff-type=compliant]
+----
+import com.nimbusds.jwt.SignedJWT;
+
+public void decode(String jwtString) {
+    SignedJWT jwt = SignedJWT.parse(jwtString);
+
+    if (!jwt.verify(new MACVerifier(sharedSecret))) {
+        throw new JOSEException("JWT signature does not match");
+    }
+}
+----
+
+=== How does this work?
+
+include::../../common/fix/encode.adoc[]
+
+include::../../common/fix/decode.adoc[]
+
+=== Going the extra mile
+
+include::../../common/extra-mile/key-storage.adoc[]
+
+include::../../common/extra-mile/key-rotation.adoc[]
+

rules/S5659/java/rule.adoc

@@ -12,6 +12,8 @@ include::how-to-fix-it/jjwt.adoc[]
 
 include::how-to-fix-it/java-jwt.adoc[]
 
+include::how-to-fix-it/nimbus.adoc[]
+
 == Resources
 
 include::../common/resources/standards.adoc[]