public function handleRequest(AphrontRequest $request)
{
$viewer = $request->getViewer();
$aid = $request->getURIData('aid');
$bid = $request->getURIData('bid');
// If "aid" is "x", then it means the user wants to generate
// a patch of an empty file to the version specified by "bid".
$ids = array($aid, $bid);
if ($aid === 'x') {
$ids = array($bid);
}
$versions = id(new PhragmentFragmentVersionQuery())->setViewer($viewer)->withIDs($ids)->execute();
$version_a = null;
if ($aid !== 'x') {
$version_a = idx($versions, $aid, null);
if ($version_a === null) {
return new Aphront404Response();
}
}
$version_b = idx($versions, $bid, null);
if ($version_b === null) {
return new Aphront404Response();
}
$file_phids = array();
if ($version_a !== null) {
$file_phids[] = $version_a->getFilePHID();
}
$file_phids[] = $version_b->getFilePHID();
$files = id(new PhabricatorFileQuery())->setViewer($viewer)->withPHIDs($file_phids)->execute();
$files = mpull($files, null, 'getPHID');
$file_a = null;
if ($version_a != null) {
$file_a = idx($files, $version_a->getFilePHID(), null);
}
$file_b = idx($files, $version_b->getFilePHID(), null);
$patch = PhragmentPatchUtil::calculatePatch($file_a, $file_b);
if ($patch === null) {
// There are no differences between the two files, so we output
// an empty patch.
$patch = '';
}
$a_sequence = 'x';
if ($version_a !== null) {
$a_sequence = $version_a->getSequence();
}
$name = $version_b->getFragment()->getName() . '.' . $a_sequence . '.' . $version_b->getSequence() . '.patch';
$return = $version_b->getURI();
if ($request->getExists('return')) {
$return = $request->getStr('return');
}
$result = PhabricatorFile::buildFromFileDataOrHash($patch, array('name' => $name, 'mime-type' => 'text/plain', 'ttl' => time() + 60 * 60 * 24));
$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
$result->attachToObject($version_b->getFragmentPHID());
unset($unguarded);
return id(new AphrontRedirectResponse())->setURI($result->getDownloadURI($return));
}
protected function execute(ConduitAPIRequest $request)
{
$path = $request->getValue('path');
$state = $request->getValue('state');
// The state is an array mapping file paths to hashes.
$patches = array();
// We need to get all of the mappings (like phragment.getstate) first
// so that we can detect deletions and creations of files.
$fragment = id(new PhragmentFragmentQuery())->setViewer($request->getUser())->withPaths(array($path))->executeOne();
if ($fragment === null) {
throw new ConduitException('ERR_BAD_FRAGMENT');
}
$mappings = $fragment->getFragmentMappings($request->getUser(), $fragment->getPath());
$file_phids = mpull(mpull($mappings, 'getLatestVersion'), 'getFilePHID');
$files = id(new PhabricatorFileQuery())->setViewer($request->getUser())->withPHIDs($file_phids)->execute();
$files = mpull($files, null, 'getPHID');
// Scan all of the files that the caller currently has and iterate
// over that.
foreach ($state as $path => $hash) {
// If $mappings[$path] exists, then the user has the file and it's
// also a fragment.
if (array_key_exists($path, $mappings)) {
$file_phid = $mappings[$path]->getLatestVersion()->getFilePHID();
if ($file_phid !== null) {
// If the file PHID is present, then we need to check the
// hashes to see if they are the same.
$hash_caller = strtolower($state[$path]);
$hash_current = $files[$file_phid]->getContentHash();
if ($hash_caller === $hash_current) {
// The user's version is identical to our version, so
// there is no update needed.
} else {
// The hash differs, and the user needs to update.
$patches[] = array('path' => $path, 'fileOld' => null, 'fileNew' => $files[$file_phid], 'hashOld' => $hash_caller, 'hashNew' => $hash_current, 'patchURI' => null);
}
} else {
// We have a record of this as a file, but there is no file
// attached to the latest version, so we consider this to be
// a deletion.
$patches[] = array('path' => $path, 'fileOld' => null, 'fileNew' => null, 'hashOld' => $hash_caller, 'hashNew' => PhragmentPatchUtil::EMPTY_HASH, 'patchURI' => null);
}
} else {
// If $mappings[$path] does not exist, then the user has a file,
// and we have absolutely no record of it what-so-ever (we haven't
// even recorded a deletion). Assuming most applications will store
// some form of data near their own files, this is probably a data
// file relevant for the application that is not versioned, so we
// don't tell the client to do anything with it.
}
}
// Check the remaining files that we know about but the caller has
// not reported.
foreach ($mappings as $path => $child) {
if (array_key_exists($path, $state)) {
// We have already evaluated this above.
} else {
$file_phid = $mappings[$path]->getLatestVersion()->getFilePHID();
if ($file_phid !== null) {
// If the file PHID is present, then this is a new file that
// we know about, but the caller does not. We need to tell
// the caller to create the file.
$hash_current = $files[$file_phid]->getContentHash();
$patches[] = array('path' => $path, 'fileOld' => null, 'fileNew' => $files[$file_phid], 'hashOld' => PhragmentPatchUtil::EMPTY_HASH, 'hashNew' => $hash_current, 'patchURI' => null);
} else {
// We have a record of deleting this file, and the caller hasn't
// reported it, so they've probably deleted it in a previous
// update.
}
}
}
// Before we can calculate patches, we need to resolve the old versions
// of files so we can draw diffs on them.
$hashes = array();
foreach ($patches as $patch) {
if ($patch['hashOld'] !== PhragmentPatchUtil::EMPTY_HASH) {
$hashes[] = $patch['hashOld'];
}
}
$old_files = array();
if (count($hashes) !== 0) {
$old_files = id(new PhabricatorFileQuery())->setViewer($request->getUser())->withContentHashes($hashes)->execute();
}
$old_files = mpull($old_files, null, 'getContentHash');
foreach ($patches as $key => $patch) {
if ($patch['hashOld'] !== PhragmentPatchUtil::EMPTY_HASH) {
if (array_key_exists($patch['hashOld'], $old_files)) {
$patches[$key]['fileOld'] = $old_files[$patch['hashOld']];
} else {
// We either can't see or can't read the old file.
$patches[$key]['hashOld'] = PhragmentPatchUtil::EMPTY_HASH;
$patches[$key]['fileOld'] = null;
}
}
}
// Now run through all of the patch entries, calculate the patches
// and return the results.
foreach ($patches as $key => $patch) {
$data = PhragmentPatchUtil::calculatePatch($patches[$key]['fileOld'], $patches[$key]['fileNew']);
unset($patches[$key]['fileOld']);
unset($patches[$key]['fileNew']);
$file = PhabricatorFile::buildFromFileDataOrHash($data, array('name' => 'patch.dmp', 'ttl' => time() + 60 * 60 * 24));
$patches[$key]['patchURI'] = $file->getDownloadURI();
}
return $patches;
}