Hello API server
The Hello API server is a sample program that demonstrates how to invoke a REST API in Active IQ Unified Manager using a simple REST client. The sample program provides you basic details about the API server in the JSON format (the server supports only application/json
format).
The URI used is: https://<hostname>/api/datacenter/svm/svms.
This sample code takes the following input parameters:
-
The API server IP address or FQDN
-
Optional: Port number (default: 443)
-
User name
-
Password
-
Response format (
application/json
)
To invoke REST APIs, you can also use other scripts such as Jersey and RESTEasy to write a Java REST client for Active IQ Unified Manager. You should be aware of the following considerations about the sample code:
-
Uses an HTTPS connection to Active IQ Unified Manager to invoke the specified REST URI
-
Ignores the certificate provided by Active IQ Unified Manager
-
Skips the host name verification during the handshake
-
Uses
javax.net.ssl.HttpsURLConnection
for a URI connection -
Uses a third-party library (
org.apache.commons.codec.binary.Base64
) for constructing the Base64 encoded string used in the HTTP basic authentication
To compile and execute the sample code, you must use Java compiler 1.8 or later.
import java.io.BufferedReader; import java.io.InputStreamReader; import java.net.URL; import java.security.SecureRandom; import java.security.cert.X509Certificate; 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.apache.commons.codec.binary.Base64; public class HelloApiServer { private static String server; private static String user; private static String password; private static String response_format = "json"; private static String server_url; private static String port = null; /* * * The main method which takes user inputs and performs the * necessary steps * to invoke the REST URI and show the response */ public static void main(String[] args) { if (args.length < 2 || args.length > 3) { printUsage(); System.exit(1); } setUserArguments(args); String serverBaseUrl = "https://" + server; if (null != port) { serverBaseUrl = serverBaseUrl + ":" + port; } server_url = serverBaseUrl + "/api/datacenter/svm/svms"; try { HttpsURLConnection connection = getAllTrustingHttpsUrlConnection(); if (connection == null) { System.err.println("FATAL: Failed to create HTTPS connection to URL: " + server_url); System.exit(1); } System.out.println("Invoking API: " + server_url); connection.setRequestMethod("GET"); connection.setRequestProperty("Accept", "application/" + response_format); String authString = getAuthorizationString(); connection.setRequestProperty("Authorization", "Basic " + authString); if (connection.getResponseCode() != 200) { System.err.println("API Invocation Failed : HTTP error code : " + connection.getResponseCode() + " : " + connection.getResponseMessage()); System.exit(1); } BufferedReader br = new BufferedReader(new InputStreamReader((connection.getInputStream()))); String response; System.out.println("Response:"); while ((response = br.readLine()) != null) { System.out.println(response); } connection.disconnect(); } catch (Exception e) { e.printStackTrace(); } } /* Print the usage of this sample code */ private static void printUsage() { System.out.println("\nUsage:\n\tHelloApiServer <hostname> <user> <password>\n"); System.out.println("\nExamples:\n\tHelloApiServer localhost admin mypassword"); System.out.println("\tHelloApiServer 10.22.12.34:8320 admin password"); System.out.println("\tHelloApiServer 10.22.12.34 admin password "); System.out.println("\tHelloApiServer 10.22.12.34:8212 admin password \n"); System.out.println("\nNote:\n\t(1) When port number is not provided, 443 is chosen by default."); } /* * Set the server, port, username and password * based on user inputs. */ private static void setUserArguments( String[] args) { server = args[0]; user = args[1]; password = args[2]; if (server.contains(":")) { String[] parts = server.split(":"); server = parts[0]; port = parts[1]; } } /* * * Create a trust manager which accepts all certificates and * use this trust * manager to initialize the SSL Context. * Create a HttpsURLConnection for this * SSL Context and skip * server hostname verification during SSL handshake. * * * Note: Trusting all certificates or skipping hostname verification * is not * required for API Services to work. These are done here to * keep this sample * REST Client code as simple as possible. */ private static HttpsURLConnection getAllTrustingHttpsUrlConnection() { HttpsURLConnection conn = null; try { /* Creating a trust manager that does not validate certificate chains */ TrustManager[] trustAllCertificatesManager = new TrustManager[]{new X509TrustManager(){ public X509Certificate[] getAcceptedIssuers(){return null;} public void checkClientTrusted(X509Certificate[] certs, String authType){} public void checkServerTrusted(X509Certificate[] certs, String authType){} }}; /* Initialize the SSLContext with the all-trusting trust manager */ SSLContext sslContext = SSLContext.getInstance("TLS"); sslContext.init(null, trustAllCertificatesManager, new SecureRandom()); HttpsURLConnection.setDefaultSSLSocketFactory(sslContext.getSocketFactory()); URL url = new URL(server_url); conn = (HttpsURLConnection) url.openConnection(); /* Do not perform an actual hostname verification during SSL Handshake. Let all hostname pass through as verified.*/ conn.setHostnameVerifier(new HostnameVerifier() { public boolean verify(String host, SSLSession session) { return true; } }); } catch (Exception e) { e.printStackTrace(); } return conn; } /* * * This forms the Base64 encoded string using the username and password * * provided by the user. This is required for HTTP Basic Authentication. */ private static String getAuthorizationString() { String userPassword = user + ":" + password; byte[] authEncodedBytes = Base64.encodeBase64(userPassword.getBytes()); String authString = new String(authEncodedBytes); return authString; } }