public IntroductionPuzzle getIntroductionPuzzle(String id) throws Exception {
SimpleFieldSet params = new SimpleFieldSet(true);
params.putOverwrite("Message", "GetIntroductionPuzzle");
params.putOverwrite("Puzzle", id);
try {
SimpleFieldSet result = sendFCPMessageBlocking(params, null, "IntroductionPuzzle").params;
try {
return new IntroductionPuzzle(
id, result.get("MimeType"), Base64.decodeStandard(result.get("Data")));
} catch (RuntimeException e) {
Logger.error(this, "Parsing puzzle failed", e);
} catch (IllegalBase64Exception e) {
Logger.error(this, "Parsing puzzle failed", e);
}
return null;
} catch (PluginNotFoundException e) {
Logger.error(this, "Getting puzzles failed", e);
return null;
}
}
/**
* @param xmlInputStream An InputStream which must not return more than {@link
* MAX_INTRODUCTIONPUZZLE_BYTE_SIZE} bytes.
*/
public IntroductionPuzzle importIntroductionPuzzle(
FreenetURI puzzleURI, InputStream xmlInputStream)
throws SAXException, IOException, InvalidParameterException, UnknownIdentityException,
IllegalBase64Exception, ParseException {
xmlInputStream =
new OneBytePerReadInputStream(
xmlInputStream); // Workaround for Java bug, see the stream class for explanation
// May not be accurate by definition of available(). So the JavaDoc requires the callers to obey
// the size limit, this is a double-check.
if (xmlInputStream.available() > MAX_INTRODUCTIONPUZZLE_BYTE_SIZE)
throw new IllegalArgumentException(
"XML contains too many bytes: " + xmlInputStream.available());
String puzzleID;
IntroductionPuzzle.PuzzleType puzzleType;
String puzzleMimeType;
Date puzzleValidUntilDate;
byte[] puzzleData;
Document xmlDoc;
synchronized (
mDocumentBuilder) { // TODO: Figure out whether the DocumentBuilder is maybe synchronized
// anyway
xmlDoc = mDocumentBuilder.parse(xmlInputStream);
}
Element puzzleElement = (Element) xmlDoc.getElementsByTagName("IntroductionPuzzle").item(0);
if (Integer.parseInt(puzzleElement.getAttribute("Version")) > INTRODUCTION_XML_FORMAT_VERSION)
throw new InvalidParameterException(
"Version "
+ puzzleElement.getAttribute("Version")
+ " > "
+ INTRODUCTION_XML_FORMAT_VERSION);
puzzleID = puzzleElement.getAttribute("ID");
puzzleType = IntroductionPuzzle.PuzzleType.valueOf(puzzleElement.getAttribute("Type"));
puzzleMimeType = puzzleElement.getAttribute("MimeType");
synchronized (mDateFormat) {
puzzleValidUntilDate = mDateFormat.parse(puzzleElement.getAttribute("ValidUntil"));
}
Element dataElement = (Element) puzzleElement.getElementsByTagName("Data").item(0);
puzzleData = Base64.decodeStandard(dataElement.getAttribute("Value"));
IntroductionPuzzle puzzle;
synchronized (mWoT) {
Identity puzzleInserter = mWoT.getIdentityByURI(puzzleURI);
puzzle =
new IntroductionPuzzle(
mWoT,
puzzleInserter,
puzzleID,
puzzleType,
puzzleMimeType,
puzzleData,
IntroductionPuzzle.getDateFromRequestURI(puzzleURI),
puzzleValidUntilDate,
IntroductionPuzzle.getIndexFromRequestURI(puzzleURI));
mWoT.getIntroductionPuzzleStore().storeAndCommit(puzzle);
}
return puzzle;
}