Fix cassandra example for service accounts.

examples/cassandra/cassandra.yaml

@@ -26,8 +26,6 @@ spec:
       value: 512M
     - name: HEAP_NEWSIZE
       value: 100M
-    - name: KUBERNETES_API_PROTOCOL
-      value: http
   volumes:
     - name: data
       emptyDir: {}

examples/cassandra/java/pom.xml

@@ -2,7 +2,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>io.k8s.cassandra</groupId>
   <artifactId>kubernetes-cassandra</artifactId>
-  <version>0.0.2</version>
+  <version>0.0.3</version>
   <build>
     <sourceDirectory>src</sourceDirectory>
     <plugins>

examples/cassandra/java/src/io/k8s/cassandra/KubernetesSeedProvider.java

@@ -1,10 +1,14 @@
 package io.k8s.cassandra;
 
 import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.net.InetAddress;
 import java.net.UnknownHostException;
 import java.net.URL;
 import java.net.URLConnection;
+import java.security.cert.X509Certificate;
 import java.security.KeyManagementException;
 import java.security.NoSuchAlgorithmException;
 import java.security.SecureRandom;
@@ -13,6 +17,13 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
+import javax.net.ssl.HostnameVerifier;
+import javax.net.ssl.HttpsURLConnection;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSession;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+
 import org.codehaus.jackson.JsonNode;
 import org.codehaus.jackson.annotate.JsonIgnoreProperties;
 import org.codehaus.jackson.map.ObjectMapper;
@@ -45,10 +56,17 @@ public class KubernetesSeedProvider implements SeedProvider {
         return val;
     }
 
+    private static String getServiceAccountToken() throws IOException {
+        String file = "/var/run/secrets/kubernetes.io/serviceaccount/token";
+        return new String(Files.readAllBytes(Paths.get(file)));
+    }
+
     private static final Logger logger = LoggerFactory.getLogger(KubernetesSeedProvider.class);
 
     private List defaultSeeds;
-   
+    private TrustManager[] trustAll;
+    private HostnameVerifier trustAllHosts;
+
     public KubernetesSeedProvider(Map<String, String> params) {
         // Taken from SimpleSeedProvider.java
         // These are used as a fallback, if we get nothing from k8s.
@@ -65,21 +83,43 @@ public class KubernetesSeedProvider implements SeedProvider {
 			logger.warn("Seed provider couldn't lookup host " + host);
 		    }
 	    }
-    } 
+	// TODO: Load the CA cert when it is available on all platforms.
+	trustAll = new TrustManager[] {
+	    new X509TrustManager() {
+		public void checkServerTrusted(X509Certificate[] certs, String authType) {}
+		public void checkClientTrusted(X509Certificate[] certs, String authType) {}
+		public X509Certificate[] getAcceptedIssuers() { return null; }
+	    }
+	};
+	trustAllHosts = new HostnameVerifier() {
+		public boolean verify(String hostname, SSLSession session) {
+		    return true;
+		}
+	    };
+    }
 
     public List<InetAddress> getSeeds() {
         List<InetAddress> list = new ArrayList<InetAddress>();
-        String protocol = getEnvOrDefault("KUBERNETES_API_PROTOCOL", "http");
-        String hostName = getEnvOrDefault("KUBERNETES_RO_SERVICE_HOST", "localhost");
-        String hostPort = getEnvOrDefault("KUBERNETES_RO_SERVICE_PORT", "8080");
-
-        String host = protocol + "://" + hostName + ":" + hostPort;
+        String host = "https://kubernetes.default.cluster.local";
         String serviceName = getEnvOrDefault("CASSANDRA_SERVICE", "cassandra");
         String path = "/api/v1beta3/namespaces/default/endpoints/";
         try {
+            String token = getServiceAccountToken();
+
+            SSLContext ctx = SSLContext.getInstance("SSL");
+            ctx.init(null, trustAll, new SecureRandom());
+
             URL url = new URL(host + path + serviceName);
+            HttpsURLConnection conn = (HttpsURLConnection)url.openConnection();
+
+            // TODO: Remove this once the CA cert is propogated everywhere, and replace
+            // with loading the CA cert.
+            conn.setSSLSocketFactory(ctx.getSocketFactory());
+            conn.setHostnameVerifier(trustAllHosts);
+
+            conn.addRequestProperty("Authorization", "Bearer " + token);
             ObjectMapper mapper = new ObjectMapper();
-            Endpoints endpoints = mapper.readValue(url, Endpoints.class);
+            Endpoints endpoints = mapper.readValue(conn.getInputStream(), Endpoints.class);
             if (endpoints != null) {
                 // Here is a problem point, endpoints.subsets can be null in first node cases.
                 if (endpoints.subsets != null && !endpoints.subsets.isEmpty()){
@@ -90,8 +130,8 @@ public class KubernetesSeedProvider implements SeedProvider {
                     }
                 }
             }
-        } catch (IOException ex) {
-	    logger.warn("Request to kubernetes apiserver failed"); 
+        } catch (IOException | NoSuchAlgorithmException | KeyManagementException ex) {
+	    logger.warn("Request to kubernetes apiserver failed", ex); 
         }
         if (list.size() == 0) {
 	    // If we got nothing, we might be the first instance, in that case