function copyObjectWithSortedKeys($value)
{
if (is_array($value)) {
return array_map("copyObjectWithSortedKeys", $value);
} else {
if (is_object($value)) {
$valueCopyWithSortedKeys = array();
foreach ($value as $key => $value) {
$valueCopyWithSortedKeys[$key] = copyObjectWithSortedKeys($value);
}
ksort($valueCopyWithSortedKeys);
return $valueCopyWithSortedKeys;
} else {
return $value;
}
}
}
function pointrel20150417_storeMessage($apiRequest)
{
global $wpdb;
$message = $apiRequest->message;
// error_log("Called pointrel20150417_storeMessage with: " . json_encode($message));
$journalIdentifier = $apiRequest->journalIdentifier;
// Check if topicIdentifier is not defined to avoid PHP warning
if (isset($message->_topicIdentifier)) {
$topicIdentifier = $message->_topicIdentifier;
} else {
$topicIdentifier = null;
}
faiIfNotAuthorized("write", $journalIdentifier, $topicIdentifier);
$table_name = tableNameForJournal($journalIdentifier);
$receivedTimestamp = getCurrentUniqueTimestamp();
// Need to calculate SHA and length without trace and in canonical form as utf-8 encoded
$oldSHA256AndLength = $message->__pointrel_sha256AndLength;
$oldTrace = $message->__pointrel_trace;
if ($oldTrace && !is_array($oldTrace)) {
wp_send_json(makeFailureResponse(400, "Bad Request: trace field should be an array if it is defined"));
}
if (!$oldTrace) {
$oldTrace = array();
}
// Calculate the sha256AndLength without the pointrel fields
// Remove all "__pointrel_" tags from the top level, which includes sha256AndLength and trace and any other local metadata
$cloneArray = $message;
foreach ($cloneArray as $key => $value) {
if (startsWith($key, "__pointrel_")) {
unset($message->{$key});
}
}
$canonicalMessageWithoutHashAndTrace = copyObjectWithSortedKeys($message);
// $canonicalFormInUTF8 = my_json_encode($canonicalMessageWithoutHashAndTrace, JSON_UNESCAPED_UNICODE);
$canonicalFormInUTF8 = my_json_encode($canonicalMessageWithoutHashAndTrace);
$sha256AndLength = hash('sha256', $canonicalFormInUTF8) . "_" . strlen($canonicalFormInUTF8);
if ($oldSHA256AndLength && $oldSHA256AndLength !== $sha256AndLength) {
error_log("Problem with new calculated SHA not matching old supplied one: {$oldSHA256AndLength} new: {$sha256AndLength} ");
error_log("canonicalFormInUTF8 was: {$canonicalFormInUTF8}");
wp_send_json(makeFailureResponse(400, "Bad Request: sha256AndLength was supplied in message but it does not match the calculated value; old: {$oldSHA256AndLength} new: {$sha256AndLength}"));
}
if (isSHA256AndLengthIndexed($journalIdentifier, $sha256AndLength)) {
wp_send_json(makeFailureResponse(409, "Conflict: The message already exists on the server", array("sha256AndLength" => $sha256AndLength)));
}
$message->__pointrel_sha256AndLength = $sha256AndLength;
// TODO: Determine server name
$serverName = "UNFINISHED_SERVER_NAME";
// Maybe could improve on this; see: http://stackoverflow.com/questions/3003145/how-to-get-the-client-ip-address-in-php
$senderIPAddress = $_SERVER['REMOTE_ADDR'];
$userIdentifier = wp_get_current_user()->user_login;
$receivedTimestamp = getCurrentUniqueTimestamp();
// Put in some local information
// TODO: More thinking about the meaning of a trace???
// TODO: Add more info about who stored this information
// TODO: Maybe add other things, like requester IP or user identifier?
$traceEntry = array("receivedByJournalIdentifier" => $journalIdentifier, "receivedByServer" => $serverName, "senderIPAddress" => $senderIPAddress, "userIdentifier" => $userIdentifier, "receivedTimestamp" => $receivedTimestamp);
$oldTrace[] = $traceEntry;
$message->__pointrel_trace = $oldTrace;
$canonicalMessage = copyObjectWithSortedKeys($message);
// $messageText = my_json_encode($canonicalMessage, JSON_UNESCAPED_UNICODE);
$messageText = my_json_encode($canonicalMessage);
// TODO: Check for empty topic and maybe act differently
$topicSHA256 = hash('sha256', $topicIdentifier);
$topicTimestamp = $message->_topicTimestamp;
/*
id int(9) UNSIGNED NOT NULL AUTO_INCREMENT,
sha256_and_length char(73) NOT NULL,
received_timestamp char(30) NOT NULL,
topic_sha256 char(64) NOT NULL,
topic_timestamp char(30) NOT NULL,
message mediumtext NOT NULL,
*/
// TODO: Remove this
// error_log("pointrel20150417_storeMessage: everything OK and ready to store -- but not storing for now as test");
// throw new Exception("storing disabled for now while test canonical JSON SHA calculation");
$wpdb->insert($table_name, array('sha256_and_length' => $sha256AndLength, 'received_timestamp' => $receivedTimestamp, 'topic_sha256' => $topicSHA256, 'topic_timestamp' => $topicTimestamp, 'message' => $messageText));
$insert_id = $wpdb->insert_id;
// error_log("pointrel20150417_storeMessage inserted row " . $insert_id);
$response = makeSuccessResponse(200, "Success", array('detail' => 'Wrote content', 'sha256AndLength' => $sha256AndLength, 'receivedTimestamp' => $receivedTimestamp, 'insert_id' => $insert_id));
wp_send_json($response);
}
