protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException {
try {
// Get the path
String path = request.getPathInfo();
if (path == null) {
response.sendError(
HttpServletResponse.SC_BAD_REQUEST, "URL has no extra path information specified.");
return;
}
int firstSlash = path.indexOf('/', 1);
if (firstSlash < 0 && path.length() == 1) {
response.sendError(400, "Module not specified.");
return;
}
String moduleName = firstSlash < 0 ? path.substring(1) : path.substring(1, firstSlash);
path = firstSlash < 0 ? "" : path.substring(firstSlash);
AtomModule module = (AtomModule) modules.get(moduleName);
if (module == null) {
response.sendError(400, "Module " + moduleName + " not found.");
return;
}
User user = null;
if (noAuth.get(moduleName) == null) {
// Authenticate
user = authenticate(request, response);
if (user == null) {
// You now get a challenge if there is no user
return;
}
}
final Principal principal = new UserXmldbPrincipal(WebDAV.BASIC_AUTH, user);
HttpServletRequest wrappedRequest =
new HttpServletRequestWrapper(request) {
public Principal getUserPrincipal() {
return principal;
}
};
// Handle the resource
DBBroker broker = null;
try {
broker = pool.get(user);
module.process(
broker,
new HttpRequestMessage(request, path, '/' + moduleName),
new HttpResponseMessage(response));
} catch (NotFoundException ex) {
LOG.info("Resource " + path + " not found by " + moduleName, ex);
response.sendError(404, ex.getMessage());
} catch (PermissionDeniedException ex) {
LOG.info(
"Permission denied to " + path + " by " + moduleName + " for " + user.getName(), ex);
response.sendError(401, ex.getMessage());
} catch (BadRequestException ex) {
LOG.info("Bad request throw from module " + moduleName, ex);
response.sendError(400, ex.getMessage());
} catch (EXistException ex) {
LOG.fatal("Exception getting broker from pool for user " + user.getName(), ex);
response.sendError(500, "Service is not available.");
} finally {
pool.release(broker);
}
} catch (IOException ex) {
LOG.fatal("I/O exception on request.", ex);
try {
response.sendError(500, "Service is not available.");
} catch (IOException finalEx) {
LOG.fatal("Cannot return 500 on exception.", ex);
}
}
}
/* (non-Javadoc)
* @see javax.servlet.GenericServlet#init(javax.servlet.ServletConfig)
*/
public void init(ServletConfig config) throws ServletException {
super.init(config);
// Configure BrokerPool
try {
if (BrokerPool.isConfigured()) {
LOG.debug("Database already started. Skipping configuration ...");
} else {
// The database isn't started, so we'll start it
String confFile = config.getInitParameter("configuration");
String dbHome = config.getInitParameter("basedir");
String start = config.getInitParameter("start");
if (confFile == null) {
confFile = "conf.xml";
}
dbHome =
(dbHome == null)
? config.getServletContext().getRealPath(".")
: config.getServletContext().getRealPath(dbHome);
LOG.debug("AtomServlet: exist.home=" + dbHome);
File f = new File(dbHome + File.separator + confFile);
LOG.debug("reading configuration from " + f.getAbsolutePath());
if (!f.canRead()) {
throw new ServletException(
"configuration file " + confFile + " not found or not readable");
}
Configuration configuration = new Configuration(confFile, dbHome);
if (start != null && start.equals("true")) {
startup(configuration);
}
}
pool = BrokerPool.getInstance();
// The default user is used when there is no authentication
String option = config.getInitParameter("use-default-user");
boolean useDefaultUser = true;
if (option != null) {
useDefaultUser = option.trim().equals("true");
}
if (useDefaultUser) {
option = config.getInitParameter("user");
if (option != null) {
defaultUsername = option;
}
option = config.getInitParameter("password");
if (option != null) {
defaultPassword = option;
}
defaultUser = getDefaultUser();
if (defaultUser != null) {
LOG.info("Using default user " + defaultUsername + " for all unauthorized requests.");
} else {
LOG.error(
"Default user "
+ defaultUsername
+ " cannot be found. A BASIC AUTH challenge will be the default.");
}
} else {
LOG.info(
"No default user. All requires must be authorized or will result in a BASIC AUTH challenge.");
defaultUser = null;
}
// Currently, we only support basic authentication
authenticator = new BasicAuthenticator(pool);
} catch (EXistException e) {
throw new ServletException("No database instance available");
} catch (DatabaseConfigurationException e) {
throw new ServletException("Unable to configure database instance: " + e.getMessage(), e);
}
// get form and container encoding's
formEncoding = config.getInitParameter("form-encoding");
if (formEncoding == null) {
formEncoding = DEFAULT_ENCODING;
}
String containerEncoding = config.getInitParameter("container-encoding");
if (containerEncoding == null) {
containerEncoding = DEFAULT_ENCODING;
}
// Load all the modules
// modules = new HashMap<String,AtomModule>();
modules = new HashMap();
noAuth = new HashMap();
String configFileOpt = config.getInitParameter("config-file");
File dbHome = pool.getConfiguration().getExistHome();
File atomConf;
if (configFileOpt == null) atomConf = new File(dbHome, "atom-services.xml");
else atomConf = new File(config.getServletContext().getRealPath(configFileOpt));
config
.getServletContext()
.log("Checking for atom configuration in " + atomConf.getAbsolutePath());
if (atomConf.exists()) {
config.getServletContext().log("Loading configuration " + atomConf.getAbsolutePath());
DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
docFactory.setNamespaceAware(true);
DocumentBuilder docBuilder = null;
Document confDoc = null;
InputStream is = null;
try {
is = new FileInputStream(atomConf);
InputSource src = new InputSource(new InputStreamReader(is, formEncoding));
URI docBaseURI = atomConf.toURI();
src.setSystemId(docBaseURI.toString());
docBuilder = docFactory.newDocumentBuilder();
confDoc = docBuilder.parse(src);
confDoc.getDocumentElement();
// Add all the modules
NodeList moduleConfList = confDoc.getElementsByTagNameNS(CONF_NS, "module");
for (int i = 0; i < moduleConfList.getLength(); i++) {
Element moduleConf = (Element) moduleConfList.item(i);
String name = moduleConf.getAttribute("name");
if (modules.get(name) != null) {
throw new ServletException(
"Module '" + name + "' is configured more than once ( child # " + (i + 1));
}
if ("false".equals(moduleConf.getAttribute("authenticate"))) {
noAuth.put(name, Boolean.TRUE);
}
String className = moduleConf.getAttribute("class");
if (className != null && className.length() > 0) {
try {
Class moduleClass = Class.forName(className);
AtomModule amodule = (AtomModule) moduleClass.newInstance();
modules.put(name, amodule);
amodule.init(new ModuleContext(config, name, atomConf.getParent()));
} catch (Exception ex) {
throw new ServletException(
"Cannot instantiate class "
+ className
+ " for module '"
+ name
+ "' due to exception: "
+ ex.getMessage(),
ex);
}
} else {
// no class means query
Query query = new Query();
modules.put(name, query);
String allowQueryPost = moduleConf.getAttribute("query-by-post");
if ("true".equals(allowQueryPost)) {
query.setQueryByPost(true);
}
NodeList methodList = moduleConf.getElementsByTagNameNS(CONF_NS, "method");
for (int m = 0; m < methodList.getLength(); m++) {
Element methodConf = (Element) methodList.item(m);
String type = methodConf.getAttribute("type");
if (type == null) {
LOG.warn("No type specified for method in module " + name);
continue;
}
// What I want but can't have because of JDK 1.4
// URI baseURI = URI.create(methodConf.getBaseURI());
URI baseURI = docBaseURI;
String queryRef = methodConf.getAttribute("query");
if (queryRef == null) {
LOG.warn("No query specified for method " + type + " in module " + name);
continue;
}
boolean fromClasspath = "true".equals(methodConf.getAttribute("from-classpath"));
Query.MethodConfiguration mconf = query.getMethodConfiguration(type);
if (mconf == null) {
LOG.warn("Unknown method " + type + " in module " + name);
continue;
}
String responseContentType = methodConf.getAttribute("content-type");
if (responseContentType != null && responseContentType.trim().length() != 0) {
mconf.setContentType(responseContentType);
}
URL queryURI = null;
if (fromClasspath) {
LOG.debug(
"Nope. Attempting to get resource "
+ queryRef
+ " from "
+ Atom.class.getName());
queryURI = Atom.class.getResource(queryRef);
} else {
queryURI = baseURI.resolve(queryRef).toURL();
}
LOG.debug(
"Loading from module "
+ name
+ " method "
+ type
+ " from resource "
+ queryURI
+ " via classpath("
+ fromClasspath
+ ") and ref ("
+ queryRef
+ ")");
if (queryURI == null) {
throw new ServletException(
"Cannot find resource " + queryRef + " for module " + name);
}
mconf.setQuerySource(queryURI);
}
query.init(new ModuleContext(config, name, atomConf.getParent()));
}
}
} catch (IOException e) {
LOG.warn(e);
throw new ServletException(e.getMessage());
} catch (SAXException e) {
LOG.warn(e);
throw new ServletException(e.getMessage());
} catch (ParserConfigurationException e) {
LOG.warn(e);
throw new ServletException(e.getMessage());
} catch (EXistException e) {
LOG.warn(e);
throw new ServletException(e.getMessage());
} finally {
if (is != null) {
try {
is.close();
} catch (IOException ex) {
}
}
}
} else {
try {
AtomProtocol protocol = new AtomProtocol();
modules.put("edit", protocol);
protocol.init(new ModuleContext(config, "edit", dbHome.getAbsolutePath()));
AtomFeeds feeds = new AtomFeeds();
modules.put("content", feeds);
feeds.init(new ModuleContext(config, "content", dbHome.getAbsolutePath()));
Query query = new Query();
query.setQueryByPost(true);
modules.put("query", query);
query.init(new ModuleContext(config, "query", dbHome.getAbsolutePath()));
Query topics = new Query();
modules.put("topic", topics);
topics
.getMethodConfiguration("GET")
.setQuerySource(topics.getClass().getResource("topic.xq"));
topics.init(new ModuleContext(config, "topic", dbHome.getAbsolutePath()));
Query introspect = new Query();
modules.put("introspect", introspect);
introspect
.getMethodConfiguration("GET")
.setQuerySource(introspect.getClass().getResource("introspect.xq"));
introspect.init(new ModuleContext(config, "introspect", dbHome.getAbsolutePath()));
} catch (EXistException ex) {
throw new ServletException("Exception during module init(): " + ex.getMessage(), ex);
}
}
// XML lib checks....
StringBuffer xmlLibMessage = new StringBuffer();
if (XmlLibraryChecker.hasValidParser(xmlLibMessage)) {
LOG.info(xmlLibMessage);
} else {
LOG.warn(xmlLibMessage);
}
xmlLibMessage.delete(0, xmlLibMessage.length());
if (XmlLibraryChecker.hasValidTransformer(xmlLibMessage)) {
LOG.info(xmlLibMessage);
} else {
LOG.warn(xmlLibMessage);
}
}
