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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.LinkedHashMap;
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;
public class RealmProtectedResourceProvider {
private static final String REALM_FORM_NAME = "j_security_check";
private URL baseUrl = null;
private String tomcatContext = null;
private String loginUrl = null;
private String logoutUrl = null;
private String dummyUrl = null;
private String jSessionId = null;
/**
* Build a new provider
*
* @param baseUrl : the web base url "http://www.example.com:8080"
* @param tomcatContext : might be "/web"
* @param loginUrl : if not null, this page will be called after form authentication
* @param logoutUrl : if not null, this page will be called at the end of getContent() process
* @param dummyUrl : mandatory - usually be index page of context but could be any valid page
* @throws Exception
*/
public RealmProtectedResourceProvider(URL baseUrl, String tomcatContext, String loginUrl, String logoutUrl, String dummyUrl) throws Exception {
// controls
if (baseUrl == null)
throw new Exception("Please, provide a valid base URL !");
if (tomcatContext == null)
throw new Exception("Please, provide a valid tomcat context");
if (dummyUrl == null)
throw new Exception("Please, provide a valid url for authentication process");
// be sure of url format
if (!tomcatContext.startsWith("/"))
tomcatContext = "/" + tomcatContext;
if (tomcatContext.endsWith("/"))
tomcatContext = tomcatContext.substring(0, tomcatContext.length() - 2);
if (!dummyUrl.startsWith("/"))
dummyUrl = "/" + dummyUrl;
// init
this.baseUrl = baseUrl;
this.tomcatContext = tomcatContext;
this.loginUrl = loginUrl;
this.logoutUrl = logoutUrl;
this.dummyUrl = dummyUrl;
}
/**
* Authenticate user by posting a Realm form. Also deal with HTTPS configuration.
*
* @param userName
* @param userPwd
* @throws Exception
*/
public void login(String userName, String userPwd) throws Exception {
String content = null;
// check if we don't have any session
if (jSessionId != null)
return;
// controls
if (userName == null || userPwd == null)
throw new Exception("You must provide a valid login/password to get any protected resource");
// // HTTPS specific code
if (baseUrl.getProtocol().equalsIgnoreCase("https"))
configureHttps();
// try to load the root page of context
URL url = new URL(buildAbsoluteUrl(this.dummyUrl));
HttpURLConnection connection = null;
try {
connection = (HttpURLConnection) url.openConnection();
connection.connect();
// flush the output
content = flushOutput(connection.getInputStream());
// Is this the login form (find the form's standard action value) ?
if (content != null && content.indexOf(REALM_FORM_NAME) > 0) {
// it's the form, so we can authenticatethe user first
// extract the JSESSIONID from the "Set-Cookie" header
String cookies = connection.getHeaderField("Set-Cookie");
if (cookies == null)
throw new Exception("No cookie get from first URL call in automatic authentication call");
String[] partsCookies = cookies.split(";");
for (String part : partsCookies) {
if (part.contains("JSESSIONID")) {
String[] subparts = part.split("=");
this.jSessionId = subparts[1];
break;
}
}
// check sessionId
if (this.jSessionId == null)
throw new Exception("Automatic authentication : unable to get a valid session Id from cookie");
// then authenticate
authenticateAndRedir(userName, userPwd);
// no need here to deal with redirection
// complete the authentication step by this optional URL call (might be used to init some application session objects)
if (this.loginUrl != null) {
getContent("index.do");
}
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (connection != null)
connection.disconnect();
}
}
/**
* Performs a logout
*
* @throws Exception
*/
public void logout() throws Exception {
if (this.logoutUrl != null)
getContent(this.logoutUrl);
else
throw new Exception("Unable to logout - no url were provided");
}
/**
* Get HTML output of input URL. Performs a Realm authentication if necessary.
*
* @param page
* @return
* @throws Exception
*/
public String getContent(String page) throws Exception {
String content = null;
// check session
if (jSessionId == null)
throw new Exception("Unable to get HTML content of page " + page + " without a valid session - please, call startSession first");
// check page url
if (!page.startsWith("/"))
page = "/" + page;
// try to load the requested page
URL url = new URL(buildAbsoluteUrl(page));
HttpURLConnection connection = null;
try {
connection = (HttpURLConnection) url.openConnection();
// append the session to the headers, so the server may identify us
connection.addRequestProperty("Cookie", "JSESSIONID=" + jSessionId);
connection.connect();
// flush the output
content = flushOutput(connection.getInputStream());
} catch (IOException e) {
throw e;
} finally {
if (connection != null)
connection.disconnect();
}
return content;
}
/**
* POST a form as expected by Realm
*
* @param userName
* @param userPwd
* @throws Exception
*/
private void authenticateAndRedir(String userName, String userPwd) throws Exception {
// Post Realm form
URL url = new URL(buildAbsoluteUrl("/j_security_check"));
HttpURLConnection connection = null;
try {
// open connection
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setDoInput(true);
connection.setDoOutput(true);
connection.setInstanceFollowRedirects(false);
connection.setUseCaches(false);
// add headers
Map<String, String> h = new LinkedHashMap<String, String>();
h.put("REFERER", buildAbsoluteUrl(""));
h.put("Cookie", "JSESSIONID=" + this.jSessionId);
h.put("Content-Type", "application/x-www-form-urlencoded");
h.put("Connection", "keep-alive");
h.put("Keep-Alive", "300");
for (String key : h.keySet())
connection.addRequestProperty(key, h.get(key));
// Prepare parameters for Realm authenticate
StringBuilder parameter = new StringBuilder();
parameter.append("j_username").append("=").append(URLEncoder.encode(userName, "UTF-8"));
parameter.append("&");
parameter.append("j_password").append("=").append(URLEncoder.encode(userPwd, "UTF-8"));
// Post parameters
OutputStream os = connection.getOutputStream();
os.write(parameter.toString().getBytes("UTF-8"));
os.flush();
connection.connect();
// flush the output
flushOutput(connection.getInputStream());
// Check response status
// int responseStatus = connection.getResponseCode();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (connection != null)
connection.disconnect();
}
}
/**
* @param is
* @return
* @throws Exception
*/
private String flushOutput(InputStream is) throws Exception {
// flush the output
BufferedReader in = null;
String inputLine = null;
StringBuilder content = new StringBuilder();
try {
in = new BufferedReader(new InputStreamReader(is));
while ((inputLine = in.readLine()) != null) {
content.append(inputLine);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (in != null)
in.close();
}
return content.toString();
}
/**
* @param page
* @return an absolute URL to get the requested page
* @throws Exception
*/
private String buildAbsoluteUrl(String page) throws Exception {
return this.baseUrl.toExternalForm() + this.tomcatContext + page;
}
/**
* Configure HTTPS for HTTP Connections
*
* BE CAREFUL *************************************************************** WARNING : this might not be a good way to deal with HTTPS connections !! * BE CAREFUL ***************************************************************
*
* @throws Exception
*/
private void configureHttps() throws Exception {
// Create a trust manager that does not validate certificate chains
TrustManager[] trustAllCerts = new TrustManager[] { new X509TrustManager() {
public java.security.cert.X509Certificate[] getAcceptedIssuers() {
return null;
}
public void checkClientTrusted(java.security.cert.X509Certificate[] certs, String authType) {
}
public void checkServerTrusted(java.security.cert.X509Certificate[] certs, String authType) {
}
} };
// Install the all-trusting trust manager
try {
SSLContext sc = SSLContext.getInstance("SSL");
sc.init(null, trustAllCerts, new java.security.SecureRandom());
HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
} catch (Exception e) {
e.printStackTrace();
}
// Set at true the HostnameVerifier
HostnameVerifier hv = new HostnameVerifier() {
public boolean verify(String urlHostName, SSLSession session) {
return true;
}
};
HttpsURLConnection.setDefaultHostnameVerifier(hv);
}
public static void main(String[] args) {
String content = null;
URL url = null;
RealmProtectedResourceProvider provider = null;
try {
url = new URL("http://localhost:8080");
provider = new RealmProtectedResourceProvider(url, "/web", "index.do", "index.do?destroySession=true", "index.do");
// login
provider.login("mylogin", "mypwd");
// get contents
content = provider.getContent("Weather.do?viewId=105");
System.out.println(content);
content = provider.getContent("Dashboards.do?viewId=100&module=workload");
System.out.println(content);
// go on with all contents to get ...
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
// logout
if (provider != null)
provider.logout();
} catch (Exception e2) {
e2.printStackTrace();
}
}
}
} |
