/**
* The <body/> element of every client request MUST possess a sequential request ID encapsulated
* via the 'rid' attribute.
*
* @param node node to validate
* @param previous previous node
*/
private void assertRequestIDSequential(final Node node, final Node previous) {
String ridStr = node.getBody().getAttribute(Attributes.RID);
assertNotNull("Request ID attribute not present", ridStr);
long rid = Long.parseLong(ridStr);
if (previous != null) {
String prevRidStr = previous.getBody().getAttribute(Attributes.RID);
assertNotNull("Previous request ID attribute not present", prevRidStr);
long prevRid = Long.parseLong(prevRidStr);
assertEquals("Request ID is not sequential", prevRid + 1, rid);
}
}
/**
* If the client will be including 'ack' attributes on requests during a session, then it MUST
* include an 'ack' attribute (set to '1') in its session creation request, and set the 'ack'
* attribute of requests throughout the session.
*
* @param idx message number (zero-based)
* @param first first message sent
* @param request message to validate
*/
private void validateSubsequestRequestAck(final int idx, final Node first, final Node request) {
if (request == first) {
// Nothing to check on first request
return;
}
String ack = first.getBody().getAttribute(Attributes.ACK);
if (ack == null) {
String subAck = request.getBody().getAttribute(Attributes.ACK);
assertNull(
"subsequent request #"
+ idx
+ " can only use acks if "
+ "advertized in session creation request",
subAck);
}
}
/**
* The <body/> element of the first request SHOULD possess the following attributes (they SHOULD
* NOT be included in any other requests except as specified under Adding Streams To A Session):
* "to", "xml:lang", "ver", "wait", "hold".
*
* @param message number (zero-based)
* @param request request message
* @param previous previous request message
*/
private void validateRequestHeaders(final int idx, final Node request, final Node previous) {
AbstractBody body = request.getBody();
if (previous == null) {
// session creation request
assertNotNull(
"to attribute not present in request #" + idx, body.getAttribute(Attributes.TO));
assertNotNull(
"xml:lang attribute not present in request #" + idx,
body.getAttribute(Attributes.XML_LANG));
assertNotNull(
"ver attribute not present in request #" + idx, body.getAttribute(Attributes.VER));
assertNotNull(
"wait attribute not present in request #" + idx, body.getAttribute(Attributes.WAIT));
assertNotNull(
"hold attribute not present in request #" + idx, body.getAttribute(Attributes.HOLD));
} else {
// subsequent request
assertNull("to attribute was present in request #" + idx, body.getAttribute(Attributes.TO));
assertNull(
"xml:lang attribute was present in request #" + idx,
body.getAttribute(Attributes.XML_LANG));
assertNull("ver attribute was present in request #" + idx, body.getAttribute(Attributes.VER));
assertNull(
"wait attribute was present in request #" + idx, body.getAttribute(Attributes.WAIT));
assertNull(
"hold attribute was present in request #" + idx, body.getAttribute(Attributes.HOLD));
}
}
/**
* Validate a request.
*
* @param message number (zero-based)
* @param first message sent
* @param previous previous request, or {@code null} if this is the first request ever sent
* @param request request message
*/
private void validateRequest(
final int idx, final Node first, final Node previous, final Node request) {
try {
assertValidXML(request);
assertSingleBodyElement(request);
assertNoComments(request);
assertNoProcessingInstructions(request);
assertRequestIDSequential(request, previous);
if (previous == null) {
validateRequestHeaders(idx, request, previous);
assertSessionCreationRequestID(request);
assertSessionCreationRequestIDRange(request);
validateSessionCreationAck(idx, request);
validateSessionCreationSID(idx, request);
validateSessionCreationHold(idx, request);
} else {
validateRequestHeaders(idx, request, previous);
validateSubsequentRequestSID(idx, request);
validateSubsequestRequestAck(idx, first, request);
validateSubsequentPause(idx, request, previous);
}
} catch (AssertionError err) {
LOG.info(
"Assertion failed for request #"
+ idx
+ ": "
+ err.getMessage()
+ "\n"
+ request.getBody().toXML());
throw (err);
}
}
/*
* The client MUST generate a large, random, positive integer for the
* initial 'rid' (see Security Considerations) and then increment that
* value by one for each subsequent request.
*
* @param node node to validate
*/
private void assertSessionCreationRequestID(final Node node) {
String ridStr = node.getBody().getAttribute(Attributes.RID);
assertNotNull("Request ID attribute not present", ridStr);
long rid = Long.parseLong(ridStr);
assertTrue("RID was <= 0", rid > 0);
// Not checking to see if it is "large" since it is already random
}
/**
* If the connection manager did not specify a 'maxpause' attribute at the start of the session
* then the client MUST NOT send a 'pause' attribute during the session.
*
* @param idx message number (zero-based)
* @param request message to validate
*/
private void validateSubsequentPause(final int idx, final Node request, final Node previous) {
AbstractBody scr = sessionCreationResponse.get();
if (scr == null) {
// Not checking this
return;
}
try {
// Check the current node:
AttrPause pause =
AttrPause.createFromString(request.getBody().getAttribute(Attributes.PAUSE));
if (pause != null) {
AttrMaxPause maxPause =
AttrMaxPause.createFromString(scr.getAttribute(Attributes.MAXPAUSE));
assertNotNull(
"Request #"
+ idx
+ " can only use pause when "
+ "advertized in session creation response",
maxPause);
assertTrue(pause.intValue() < maxPause.intValue());
}
// Check the previous node
AttrPause prevPause =
AttrPause.createFromString(previous.getBody().getAttribute(Attributes.PAUSE));
if (prevPause != null) {
long delta = request.getTime() - previous.getTime();
if (delta > prevPause.getInMilliseconds()) {
fail(
"Request #"
+ idx
+ " was sent too late relative to "
+ "the previous pause message (delta="
+ delta
+ ", pause="
+ prevPause.getInMilliseconds()
+ ")");
}
}
} catch (BOSHException boshx) {
fail("Could not parse pause/maxpause: " + boshx.getMessage());
}
}
/*
* The client MUST take care to choose an initial 'rid' that will never be
* incremented above 9007199254740991 [21] within the session.
*
* @param node node to validate
*/
private void assertSessionCreationRequestIDRange(final Node node) {
String ridStr = node.getBody().getAttribute(Attributes.RID);
long rid = Long.parseLong(ridStr);
BigInteger biRID = BigInteger.valueOf(rid);
BigInteger biMax = new BigInteger("9007199254740991");
BigInteger biThreshold = BigInteger.valueOf(Math.round(Math.pow(2.0, 20.0)));
assertTrue(
"Initial RID leaves fewer than "
+ biThreshold.toString()
+ " total requests before max RID limit is hit",
biRID.compareTo(biMax.subtract(biThreshold)) <= 0);
}
/**
* XEP-0124 Section 6:
*
* <p>The <body/> element and its content together MUST conform to the specifications set out in
* XML 1.0 [14]
*
* <p>and...
*
* <p>They SHOULD also conform to Namespaces in XML [15].
*
* <p>and...
*
* <p>The content MUST NOT contain Partial XML elements.
*
* @param request request to validate
*/
private void assertValidXML(final Node request) {
ByteArrayInputStream stream = new ByteArrayInputStream(request.getBody().toXML().getBytes());
StreamSource source = new StreamSource(stream);
Throwable thr;
try {
synchronized (VALIDATOR) {
VALIDATOR.validate(source);
}
return;
} catch (IOException iox) {
thr = iox;
} catch (SAXException saxx) {
thr = saxx;
}
fail("Request XML validation failed: " + thr.getMessage());
}
/**
* Checks that the validator didn't encounter any problems. If it did, it should perform the
* assertions here.
*
* @param scr session creation response message to use in validation, or {@code null} to skip
* those checks
*/
public void checkAssertions(final AbstractBody scr) {
if (requests == null) {
// Nothing to validate.
LOG.fine("Nothing to validate");
return;
}
sessionCreationResponse.set(scr);
LOG.fine("Validating " + requests.size() + " message(s)");
Node previous = null;
Node first = null;
int index = 0;
for (Node node : requests) {
if (first == null) {
first = node;
}
String rid = node.getBody().getAttribute(Attributes.RID);
LOG.fine("Validating msg #" + index + " (RID: " + rid + ")");
validateRequest(index, first, previous, node);
previous = node;
index++;
}
}
/**
* Execute an XPath against a AbstractBody instance.
*
* @param body node with body to XPath against
* @param xpath the XPath expression
* @param returnType type to return
* @return resulting node
*/
private Object bodyXPath(final Node node, final String xpath, final QName returnType) {
try {
String xml = node.getBody().toXML();
ByteArrayInputStream stream = new ByteArrayInputStream(xml.getBytes());
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setNamespaceAware(true);
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.parse(stream);
XPathFactory xpf = XPathFactory.newInstance();
XPath xp = xpf.newXPath();
xp.setNamespaceContext(
new NamespaceContext() {
Map<String, String> map = new HashMap<String, String>();
{
map.put("bosh", BodyQName.BOSH_NS_URI);
map.put("xml", XMLConstants.XML_NS_URI);
}
public String getNamespaceURI(String prefix) {
return map.get(prefix);
}
public String getPrefix(String namespaceURI) {
throw new UnsupportedOperationException("Not supported.");
}
public Iterator getPrefixes(String namespaceURI) {
throw new UnsupportedOperationException("Not supported.");
}
});
return xp.evaluate(xpath, document, returnType);
} catch (Throwable thr) {
fail("Could not parse body to DOM document: " + thr.getMessage());
}
return null;
}
/**
* All requests after the first one MUST include a valid 'sid' attribute.
*
* @param message number (zero-based)
* @param request request message
* @param previous previous request, or {@code null} if this is the first request ever sent
*/
private void validateSubsequentRequestSID(final int idx, final Node request) {
assertNotNull(
"sid attribute not present in request #" + idx,
request.getBody().getAttribute(Attributes.SID));
}
/**
* If the client is not able to use HTTP Pipelining then the "hold" attribute SHOULD be set to
* "1".
*
* @param message number (zero-based)
* @param request request message
*/
private void validateSessionCreationHold(final int idx, final Node request) {
String hold = request.getBody().getAttribute(Attributes.HOLD);
assertNotNull("hold attribute was not present in initial request", hold);
assertEquals("incorrect hold attrivute value", "1", hold);
}
/**
* A client MAY include an 'ack' attribute (set to "1") to indicate that it will be using
* acknowledgements throughout the session If the client will be including 'ack' attributes on
* requests during a session, then it MUST include an 'ack' attribute (set to '1') in its session
* creation request, and set the 'ack' attribute of requests throughout the session.
*
* @param message number (zero-based)
* @param request request message
*/
private void validateSessionCreationAck(final int idx, final Node request) {
String ack = request.getBody().getAttribute(Attributes.ACK);
if (ack != null) {
assertEquals("intial ack must be 1", "1", ack);
}
}
/**
* The initialization request is unique in that the <body/> element MUST NOT possess a 'sid'
* attribute.
*
* @param message number (zero-based)
* @param request request message
*/
private void validateSessionCreationSID(final int idx, final Node request) {
assertNull(
"sid attribute was present in request #" + idx,
request.getBody().getAttribute(Attributes.SID));
}