/** Check to see if the configuration file has been updated so that it may be reloaded. */
private boolean configUpdated() {
try {
URL url = ctx.getResource(resourcesDir + XHP_CONFIG);
URLConnection con;
if (url == null) return false;
con = url.openConnection();
long lastModified = con.getLastModified();
long XHP_LAST_MODIFIEDModified = 0;
if (ctx.getAttribute(XHP_LAST_MODIFIED) != null) {
XHP_LAST_MODIFIEDModified = ((Long) ctx.getAttribute(XHP_LAST_MODIFIED)).longValue();
} else {
ctx.setAttribute(XHP_LAST_MODIFIED, new Long(lastModified));
return false;
}
if (XHP_LAST_MODIFIEDModified < lastModified) {
ctx.setAttribute(XHP_LAST_MODIFIED, new Long(lastModified));
return true;
}
} catch (Exception ex) {
getLogger().severe("XmlHttpProxyServlet error checking configuration: " + ex);
}
return false;
}
private void getServices(HttpServletResponse res) {
InputStream is = null;
try {
URL url = ctx.getResource(resourcesDir + XHP_CONFIG);
// use classpath if not found locally.
if (url == null)
url = XmlHttpProxyServlet.class.getResource(classpathResourcesDir + XHP_CONFIG);
is = url.openStream();
} catch (Exception ex) {
try {
getLogger().severe("XmlHttpProxyServlet error loading xhp.json : " + ex);
PrintWriter writer = res.getWriter();
writer.write(
"XmlHttpProxyServlet Error: Error loading xhp.json. Make sure it is available in the /resources directory of your applicaton.");
writer.flush();
} catch (Exception iox) {
}
}
services = xhp.loadServices(is);
}
public void init(ServletConfig config) throws ServletException {
super.init(config);
ctx = config.getServletContext();
// set the response content type
if (ctx.getInitParameter("responseContentType") != null) {
responseContentType = ctx.getInitParameter("responseContentType");
}
// allow for resources dir over-ride at the xhp level otherwise allow
// for the jmaki level resources
if (ctx.getInitParameter("jmaki-xhp-resources") != null) {
resourcesDir = ctx.getInitParameter("jmaki-xhp-resources");
} else if (ctx.getInitParameter("jmaki-resources") != null) {
resourcesDir = ctx.getInitParameter("jmaki-resources");
}
// allow for resources dir over-ride
if (ctx.getInitParameter("jmaki-classpath-resources") != null) {
classpathResourcesDir = ctx.getInitParameter("jmaki-classpath-resources");
}
String requireSessionString = ctx.getInitParameter("requireSession");
if (requireSessionString != null) {
if ("false".equals(requireSessionString)) {
requireSession = false;
getLogger().severe("XmlHttpProxyServlet: intialization. Session requirement disabled.");
} else if ("true".equals(requireSessionString)) {
requireSession = true;
getLogger().severe("XmlHttpProxyServlet: intialization. Session requirement enabled.");
}
}
String xdomainString = ctx.getInitParameter("allowXDomain");
if (xdomainString != null) {
if ("true".equals(xdomainString)) {
allowXDomain = true;
getLogger().severe("XmlHttpProxyServlet: intialization. xDomain access is enabled.");
} else if ("false".equals(xdomainString)) {
allowXDomain = false;
getLogger().severe("XmlHttpProxyServlet: intialization. xDomain access is disabled.");
}
}
// if there is a proxyHost and proxyPort specified create an HttpClient with the proxy
String proxyHost = ctx.getInitParameter("proxyHost");
String proxyPortString = ctx.getInitParameter("proxyPort");
if (proxyHost != null && proxyPortString != null) {
int proxyPort = 8080;
try {
proxyPort = new Integer(proxyPortString).intValue();
xhp = new XmlHttpProxy(proxyHost, proxyPort);
} catch (NumberFormatException nfe) {
getLogger()
.severe("XmlHttpProxyServlet: intialization error. The proxyPort must be a number");
throw new ServletException(
"XmlHttpProxyServlet: intialization error. The proxyPort must be a number");
}
} else {
xhp = new XmlHttpProxy();
}
}
public void doProcess(HttpServletRequest req, HttpServletResponse res, boolean isPost) {
StringBuffer bodyContent = null;
OutputStream out = null;
PrintWriter writer = null;
String serviceKey = null;
try {
BufferedReader in = req.getReader();
String line = null;
while ((line = in.readLine()) != null) {
if (bodyContent == null) bodyContent = new StringBuffer();
bodyContent.append(line);
}
} catch (Exception e) {
}
try {
if (requireSession) {
// check to see if there was a session created for this request
// if not assume it was from another domain and blow up
// Wrap this to prevent Portlet exeptions
HttpSession session = req.getSession(false);
if (session == null) {
res.setStatus(HttpServletResponse.SC_FORBIDDEN);
return;
}
}
serviceKey = req.getParameter("id");
// only to preven regressions - Remove before 1.0
if (serviceKey == null) serviceKey = req.getParameter("key");
// check if the services have been loaded or if they need to be reloaded
if (services == null || configUpdated()) {
getServices(res);
}
String urlString = null;
String xslURLString = null;
String userName = null;
String password = null;
String format = "json";
String callback = req.getParameter("callback");
String urlParams = req.getParameter("urlparams");
String countString = req.getParameter("count");
// encode the url to prevent spaces from being passed along
if (urlParams != null) {
urlParams = urlParams.replace(' ', '+');
}
try {
if (services.has(serviceKey)) {
JSONObject service = services.getJSONObject(serviceKey);
// default to the service default if no url parameters are specified
if (urlParams == null && service.has("defaultURLParams")) {
urlParams = service.getString("defaultURLParams");
}
String serviceURL = service.getString("url");
// build the URL
if (urlParams != null && serviceURL.indexOf("?") == -1) {
serviceURL += "?";
} else if (urlParams != null) {
serviceURL += "&";
}
String apikey = "";
if (service.has("username")) userName = service.getString("username");
if (service.has("password")) password = service.getString("password");
if (service.has("apikey")) apikey = service.getString("apikey");
urlString = serviceURL + apikey;
if (urlParams != null) urlString += "&" + urlParams;
if (service.has("xslStyleSheet")) {
xslURLString = service.getString("xslStyleSheet");
}
}
// code for passing the url directly through instead of using configuration file
else if (req.getParameter("url") != null) {
String serviceURL = req.getParameter("url");
// build the URL
if (urlParams != null && serviceURL.indexOf("?") == -1) {
serviceURL += "?";
} else if (urlParams != null) {
serviceURL += "&";
}
urlString = serviceURL;
if (urlParams != null) urlString += urlParams;
} else {
writer = res.getWriter();
if (serviceKey == null)
writer.write("XmlHttpProxyServlet Error: id parameter specifying serivce required.");
else
writer.write(
"XmlHttpProxyServlet Error : service for id '" + serviceKey + "' not found.");
writer.flush();
return;
}
} catch (Exception ex) {
getLogger().severe("XmlHttpProxyServlet Error loading service: " + ex);
}
Map paramsMap = new HashMap();
paramsMap.put("format", format);
// do not allow for xdomain unless the context level setting is enabled.
if (callback != null && allowXDomain) {
paramsMap.put("callback", callback);
}
if (countString != null) {
paramsMap.put("count", countString);
}
InputStream xslInputStream = null;
if (urlString == null) {
writer = res.getWriter();
writer.write(
"XmlHttpProxyServlet parameters: id[Required] urlparams[Optional] format[Optional] callback[Optional]");
writer.flush();
return;
}
// default to JSON
res.setContentType(responseContentType);
out = res.getOutputStream();
// get the stream for the xsl stylesheet
if (xslURLString != null) {
// check the web root for the resource
URL xslURL = null;
xslURL = ctx.getResource(resourcesDir + "xsl/" + xslURLString);
// if not in the web root check the classpath
if (xslURL == null) {
xslURL =
XmlHttpProxyServlet.class.getResource(classpathResourcesDir + "xsl/" + xslURLString);
}
if (xslURL != null) {
xslInputStream = xslURL.openStream();
} else {
String message =
"Could not locate the XSL stylesheet provided for service id "
+ serviceKey
+ ". Please check the XMLHttpProxy configuration.";
getLogger().severe(message);
try {
out.write(message.getBytes());
out.flush();
return;
} catch (java.io.IOException iox) {
}
}
}
if (!isPost) {
xhp.doGet(urlString, out, xslInputStream, paramsMap, userName, password);
} else {
if (bodyContent == null)
getLogger()
.info(
"XmlHttpProxyServlet attempting to post to url "
+ urlString
+ " with no body content");
xhp.doPost(
urlString,
out,
xslInputStream,
paramsMap,
bodyContent.toString(),
req.getContentType(),
userName,
password);
}
} catch (Exception iox) {
iox.printStackTrace();
getLogger().severe("XmlHttpProxyServlet: caught " + iox);
try {
writer = res.getWriter();
writer.write(iox.toString());
writer.flush();
} catch (java.io.IOException ix) {
ix.printStackTrace();
}
return;
} finally {
try {
if (out != null) out.close();
if (writer != null) writer.close();
} catch (java.io.IOException iox) {
}
}
}