fixes #2229 Add httpClient to PathPrefixAuth to cache the client instance

Author: stevehu

client/src/main/java/com/networknt/client/Http2Client.java

@@ -135,7 +135,7 @@ public class Http2Client {
 
 
     // TokenManager is to manage cached jwt tokens for this client.
-    private TokenManager tokenManager = TokenManager.getInstance();
+    private final TokenManager tokenManager = TokenManager.getInstance();
 
     // This is the old connection pool that is kept for backward compatibility.
     private final Http2ClientConnectionPool http2ClientConnectionPool = Http2ClientConnectionPool.getInstance();

config/src/main/java/com/networknt/config/PathPrefixAuth.java

@@ -1,5 +1,7 @@
 package com.networknt.config;
 
+import java.net.http.HttpClient;
+
 /**
  * This is an object that contains all the authentication info for each path prefix in the pathPrefixAuth config
  * section. By making it a list of objects, we can support unlimited number of APIs with different authentication
@@ -28,6 +30,7 @@ public class PathPrefixAuth {
 
     long expiration;
     String accessToken;
+    HttpClient httpClient;
 
     public PathPrefixAuth() {
     }
@@ -191,4 +194,12 @@ public String getScope() {
     public void setScope(String scope) {
         this.scope = scope;
     }
+
+    public HttpClient getHttpClient() {
+        return httpClient;
+    }
+
+    public void setHttpClient(HttpClient httpClient) {
+        this.httpClient = httpClient;
+    }
 }

config/src/test/java/com/networknt/config/PathPrefixAuthTest.java

@@ -0,0 +1,28 @@
+package com.networknt.config;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.List;
+
+public class PathPrefixAuthTest {
+
+    /**
+     * This test can confirm that even httpClient is added to the class, we can still use jackson to
+     * convert a string into an array of PathPrefixAuth objects.
+     */
+    @Test
+    public void testPathPrefixAuth() {
+        String s = "[{\"clientId\":\"my-client\",\"clientSecret\":\"my-secret\",\"tokenUrl\":\"www.example.com/token\"}]";
+        List<PathPrefixAuth> pathPrefixAuths = null;
+        try {
+            pathPrefixAuths = Config.getInstance().getMapper().readValue(s, new TypeReference<>() {});
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        Assert.assertNotNull(pathPrefixAuths);
+        Assert.assertEquals(pathPrefixAuths.size(), 1);
+    }
+
+}