string sync_changes (void * webserver_request)
{
Webserver_Request * request = (Webserver_Request *) webserver_request;
Sync_Logic sync_logic = Sync_Logic (webserver_request);
Database_Modifications database_modifications;
// Check on the credentials.
if (!sync_logic.credentials_okay ()) return "";
// Bail out if the change notifications are not now available to clients.
if (!config_globals_change_notifications_available) {
request->response_code = 503;
return "";
}
// Client makes a prioritized server call: Record the client's IP address.
sync_logic.prioritized_ip_address_record ();
// Get the relevant parameters the client may have POSTed to us, the server.
string user = hex2bin (request->post ["u"]);
int action = convert_to_int (request->post ["a"]);
int id = convert_to_int (request->post ["i"]);
switch (action) {
case Sync_Logic::changes_delete_modification:
{
// The server deletes the change notification.
database_modifications.deleteNotification (id);
Database_Logs::log ("Client deletes change notification from server: " + convert_to_string (id), Filter_Roles::translator ());
request->database_config_user ()->setChangeNotificationsChecksum ("");
return "";
}
case Sync_Logic::changes_get_checksum:
{
// The server responds with the possibly cached total checksum for the user's change notifications.
string checksum = request->database_config_user ()->getChangeNotificationsChecksum ();
if (checksum.empty ()) {
checksum = Sync_Logic::changes_checksum (user);
request->database_config_user ()->setChangeNotificationsChecksum (checksum);
}
return checksum;
}
case Sync_Logic::changes_get_identifiers:
{
// The server responds with the identifiers of all the user's change notifications.
vector <int> ids = database_modifications.getNotificationIdentifiers (user, false);
string response;
for (auto & id : ids) {
if (!response.empty ()) response.append ("\n");
response.append (convert_to_string (id));
}
return response;
}
case Sync_Logic::changes_get_modification:
{
// The server responds with the relevant data of the requested modification.
vector <string> lines;
// category
lines.push_back (database_modifications.getNotificationCategory (id));
// bible
lines.push_back (database_modifications.getNotificationBible (id));
// book
// chapter
// verse
Passage passage = database_modifications.getNotificationPassage (id);
lines.push_back (convert_to_string (passage.book));
lines.push_back (convert_to_string (passage.chapter));
lines.push_back (passage.verse);
// oldtext
lines.push_back (database_modifications.getNotificationOldText (id));
// modification
lines.push_back (database_modifications.getNotificationModification (id));
// newtext
lines.push_back (database_modifications.getNotificationNewText (id));
// Result.
return filter_string_implode (lines, "\n");
}
}
// Bad request.
// Delay a while to obstruct a flood of bad requests.
this_thread::sleep_for (chrono::seconds (1));
request->response_code = 400;
return "";
}
string sync_settings (void * webserver_request)
{
Webserver_Request * request = (Webserver_Request *) webserver_request;
Sync_Logic sync_logic = Sync_Logic (webserver_request);
// Check on the credentials.
if (!sync_logic.credentials_okay ()) return "";
// Client makes a prioritized server call: Record the client's IP address.
sync_logic.prioritized_ip_address_record ();
// Get the relevant parameters the client POSTed to us, the server.
int action = convert_to_int (request->post ["a"]);
string value = request->post ["v"];
// The value can be all Bibles, or one Bible.
string bible_s = request->post ["b"];
switch (action) {
case Sync_Logic::settings_get_total_checksum:
{
return sync_logic.settings_checksum (filter_string_explode (bible_s, '\n'));
}
case Sync_Logic::settings_send_workbench_urls:
{
request->database_config_user()->setWorkbenchURLs (value);
return "";
}
case Sync_Logic::settings_get_workbench_urls:
{
return request->database_config_user()->getWorkbenchURLs ();
}
case Sync_Logic::settings_send_workbench_widths:
{
request->database_config_user()->setWorkbenchWidths (value);
return "";
}
case Sync_Logic::settings_get_workbench_widths:
{
return request->database_config_user()->getWorkbenchWidths ();
}
case Sync_Logic::settings_send_workbench_heights:
{
request->database_config_user()->setWorkbenchHeights (value);
return "";
}
case Sync_Logic::settings_get_workbench_heights:
{
return request->database_config_user()->getWorkbenchHeights ();
}
case Sync_Logic::settings_send_resources_organization:
{
vector <string> resources = filter_string_explode (value, '\n');
request->database_config_user()->setActiveResources (resources);
return "";
}
case Sync_Logic::settings_get_resources_organization:
{
vector <string> resources = request->database_config_user()->getActiveResources ();
return filter_string_implode (resources, "\n");
}
case Sync_Logic::settings_get_bible_id:
{
return convert_to_string (request->database_bibles()->getID (bible_s));
}
case Sync_Logic::settings_get_bible_font:
{
return Database_Config_Bible::getTextFont (bible_s);
}
}
// Bad request.
// Delay a while to obstruct a flood of bad requests.
this_thread::sleep_for (chrono::seconds (1));
request->response_code = 400;
return "";
}
void sendreceive_usfmresources ()
{
mutex_sendreceive_usfmresources.lock ();
bool bail_out = sendreceive_usfmresources_running;
mutex_sendreceive_usfmresources.unlock ();
if (bail_out) return;
mutex_sendreceive_usfmresources.lock ();
sendreceive_usfmresources_running = true;
mutex_sendreceive_usfmresources.unlock ();
Database_UsfmResources database_usfmresources = Database_UsfmResources ();
Webserver_Request request;
Sync_Logic sync_logic = Sync_Logic (&request);
Database_Logs::log (sendreceive_usfmresources_sendreceive_text (), Filter_Roles::translator ());
string address = Database_Config_General::getServerAddress ();
int port = Database_Config_General::getServerPort ();
string url = client_logic_url (address, port, sync_usfmresources_url ());
map <string, string> post;
string error;
string response;
// Request the checksum of all USFM resources from the server.
// Compare it with the local checksum.
// If the two match: Ready.
post ["a"] = convert_to_string (Sync_Logic::usfmresources_get_total_checksum);
response = sync_logic.post (post, url, error);
if (!error.empty ()) {
Database_Logs::log (sendreceive_usfmresources_text () + "Failure getting total checksum: " + error, Filter_Roles::translator ());
sendreceive_usfmresources_done ();
return;
}
string checksum = Sync_Logic::usfm_resources_checksum ();
if (response == checksum) {
Database_Logs::log (sendreceive_usfmresources_up_to_date_text (), Filter_Roles::translator ());
sendreceive_usfmresources_done ();
return;
}
// Request a list of all USFM resources available on the server.
post ["a"] = convert_to_string (Sync_Logic::usfmresources_get_resources);
response = sync_logic.post (post, url, error);
if (!error.empty ()) {
Database_Logs::log (sendreceive_usfmresources_text () + "Failure getting resources: " + error, Filter_Roles::translator ());
sendreceive_usfmresources_done ();
return;
}
vector <string> server_resources = filter_string_explode (response, '\n');
// Delete any resource on the local client but not on the server.
vector <string> client_resources = database_usfmresources.getResources ();
vector <string> resources = filter_string_array_diff (client_resources, server_resources);
for (auto & resource : resources) {
database_usfmresources.deleteResource (resource);
}
// Deal with each USFM resource individually.
for (auto & resource : server_resources) {
// Request the checksum of the resources from the server.
// Compare it with the checksum of the local resource.
// If they match: Go to the next resource.
post ["a"] = convert_to_string (Sync_Logic::usfmresources_get_resource_checksum);
post ["r"] = resource;
response = sync_logic.post (post, url, error);
if (!error.empty ()) {
Database_Logs::log (sendreceive_usfmresources_text () + "Failure getting checksum of resource: " + error, Filter_Roles::translator ());
sendreceive_usfmresources_done ();
return;
}
checksum = Sync_Logic::usfm_resource_checksum (resource);
if (response == checksum) {
continue;
}
// Request a list of all books in the resource on the server.
post ["a"] = convert_to_string (Sync_Logic::usfmresources_get_books);
post ["r"] = resource;
response = sync_logic.post (post, url, error);
if (!error.empty ()) {
Database_Logs::log (sendreceive_usfmresources_text () + "Failure getting books of resource: " + error, Filter_Roles::translator ());
sendreceive_usfmresources_done ();
return;
}
vector <int> server_books;
vector <string> sbooks = filter_string_explode (response, '\n');
for (auto & book : sbooks) server_books.push_back (convert_to_int (book));
// Delete any books from the client that are not on the server.
vector <int> client_books = database_usfmresources.getBooks (resource);
vector <int> books = filter_string_array_diff (client_books, server_books);
for (auto & book : books) {
database_usfmresources.deleteBook (resource, book);
}
// Deal with each book individually.
for (auto & book : server_books) {
// Request checksum of this book,
// compare it with the local checksum,
// and skip the book if the checksums match.
post ["a"] = convert_to_string (Sync_Logic::usfmresources_get_book_checksum);
post ["r"] = resource;
post ["b"] = convert_to_string (book);
response = sync_logic.post (post, url, error);
if (!error.empty ()) {
Database_Logs::log (sendreceive_usfmresources_text () + "Failure getting checksum of resource book: " + error, Filter_Roles::translator ());
sendreceive_usfmresources_done ();
return;
}
checksum = Sync_Logic::usfm_resource_book_checksum (resource, book);
if (response == checksum) {
continue;
}
string bookname = Database_Books::getEnglishFromId (book);
Database_Logs::log (sendreceive_usfmresources_text () + "Synchronizing " + resource + " " + bookname, Filter_Roles::translator ());
// Retrieve a list of chapters in the $book from the server.
post ["a"] = convert_to_string (Sync_Logic::usfmresources_get_chapters);
post ["r"] = resource,
post ["b"] = convert_to_string (book);
response = sync_logic.post (post, url, error);
if (!error.empty ()) {
Database_Logs::log (sendreceive_usfmresources_text () + "Failure getting chapters of resource book: " + error, Filter_Roles::translator ());
sendreceive_usfmresources_done ();
return;
}
vector <int> server_chapters;
vector <string> schapters = filter_string_explode (response, '\n');
for (auto & chapter : schapters) server_chapters.push_back (convert_to_int (chapter));
// Delete local chapters not found on the server.
vector <int> client_chapters = database_usfmresources.getChapters (resource, book);
vector <int> chapters = filter_string_array_diff (client_chapters, server_chapters);
for (auto & chapter : chapters) {
database_usfmresources.deleteChapter (resource, book, chapter);
}
// Go through each chapter individually.
for (auto & chapter : server_chapters) {
// Get the checksum of the chapter as it is on the server.
post ["a"] = convert_to_string (Sync_Logic::usfmresources_get_chapter_checksum);
post ["r"] = resource;
post ["b"] = convert_to_string (book);
post ["c"] = convert_to_string (chapter);
response = sync_logic.post (post, url, error);
if (!error.empty ()) {
Database_Logs::log (sendreceive_usfmresources_text () + "Failure getting checksum of resource chapter: " + error, Filter_Roles::translator ());
sendreceive_usfmresources_done ();
return;
}
checksum = Sync_Logic::usfm_resource_chapter_checksum (resource, book, chapter);
if (response == checksum) {
continue;
}
// Download the chapter from the server, and store it locally on the client.
post ["a"] = convert_to_string (Sync_Logic::usfmresources_get_chapter);
post ["r"] = resource;
post ["b"] = convert_to_string (book);
post ["c"] = convert_to_string (chapter);
response = sync_logic.post (post, url, error);
if (!error.empty ()) {
Database_Logs::log (sendreceive_usfmresources_text () + "Failure downloading resource chapter: " + error, Filter_Roles::translator ());
sendreceive_usfmresources_done ();
return;
}
database_usfmresources.storeChapter (resource, book, chapter, response);
}
}
}
// Done.
Database_Logs::log (sendreceive_usfmresources_text () + "Now up to date", Filter_Roles::translator ());
sendreceive_usfmresources_done ();
}
void sendreceive_changes ()
{
if (sendreceive_changes_watchdog) {
int time = filter_date_seconds_since_epoch ();
if (time < (sendreceive_changes_watchdog + 900)) {
Database_Logs::log (sendreceive_changes_text () + translate("Still busy"), Filter_Roles::translator ());
return;
}
Database_Logs::log (sendreceive_changes_text () + translate("Watchdog timeout"), Filter_Roles::translator ());
}
sendreceive_changes_kick_watchdog ();
config_globals_syncing_changes = true;
Database_Logs::log (sendreceive_changes_sendreceive_text (), Filter_Roles::translator ());
Webserver_Request request;
Sync_Logic sync_logic = Sync_Logic (&request);
Database_Modifications database_modifications;
if (!database_modifications.healthy ()) {
Database_Logs::log (sendreceive_changes_text () + translate("Recreate damaged modifications database"), Filter_Roles::translator ());
database_modifications.erase ();
database_modifications.create ();
}
string response = client_logic_connection_setup ();
int iresponse = convert_to_int (response);
if (iresponse < Filter_Roles::guest () || iresponse > Filter_Roles::admin ()) {
Database_Logs::log (sendreceive_changes_text () + translate("Failure to initiate connection"), Filter_Roles::translator ());
send_receive_changes_done ();
return;
}
// Set the correct user in the session: The sole user on the Client.
vector <string> users = request.database_users ()->getUsers ();
if (users.empty ()) {
Database_Logs::log (translate("No user found"), Filter_Roles::translator ());
send_receive_changes_done ();
return;
}
string user = users [0];
request.session_logic ()->setUsername (user);
string password = request.database_users ()->getmd5 (user);
// The basic request to be POSTed to the server.
// It contains the user's credentials.
map <string, string> post;
post ["u"] = bin2hex (user);
post ["p"] = password;
post ["l"] = convert_to_string (request.database_users ()->getUserLevel (user));
// Error variables.
string error;
bool communication_errors = false;
// Server URL to call.
string address = Database_Config_General::getServerAddress ();
int port = Database_Config_General::getServerPort ();
string url = client_logic_url (address, port, sync_changes_url ());
// Send the removed change notifications to the server.
vector <int> ids = request.database_config_user ()->getRemovedChanges ();
if (!ids.empty ()) Database_Logs::log (sendreceive_changes_text () + "Sending removed notifications: " + convert_to_string (ids.size()), Filter_Roles::translator ());
for (auto & id : ids) {
post ["a"] = convert_to_string (Sync_Logic::changes_delete_modification);
post ["i"] = convert_to_string (id);
response = sync_logic.post (post, url, error);
if (!error.empty ()) {
communication_errors = true;
Database_Logs::log (sendreceive_changes_text () + "Failure sending removed notification: " + error, Filter_Roles::translator ());
}
else {
request.database_config_user ()->removeRemovedChange (id);
}
}
if (communication_errors) {
Database_Logs::log (sendreceive_changes_text () + translate("Not downloading change notifications due to communication error"), Filter_Roles::translator ());
send_receive_changes_done ();
return;
}
// Compare the total checksum for the change notifications for the active user on client and server.
// Checksum is cached for future re-use.
// Take actions based on that.
string client_checksum = request.database_config_user ()->getChangeNotificationsChecksum ();
if (client_checksum.empty ()) {
client_checksum = Sync_Logic::changes_checksum (user);
request.database_config_user ()->setChangeNotificationsChecksum (client_checksum);
}
string server_checksum;
post ["a"] = convert_to_string (Sync_Logic::changes_get_checksum);
response = sync_logic.post (post, url, error);
if (!error.empty ()) {
Database_Logs::log (sendreceive_changes_text () + "Failure receiving checksum: " + error, Filter_Roles::translator ());
send_receive_changes_done ();
return;
}
server_checksum = response;
if (client_checksum == server_checksum) {
Database_Logs::log (sendreceive_changes_up_to_date_text (), Filter_Roles::translator ());
send_receive_changes_done ();
return;
}
// Get all identifiers for the notifications on the server for the user.
// Get the identifiers on the client.
vector <int> client_identifiers = database_modifications.getNotificationIdentifiers (user, false);
vector <int> server_identifiers;
post ["a"] = convert_to_string (Sync_Logic::changes_get_identifiers);
response = sync_logic.post (post, url, error);
if (!error.empty ()) {
Database_Logs::log (sendreceive_changes_text () + "Failure receiving identifiers: " + error, Filter_Roles::translator ());
send_receive_changes_done ();
return;
}
{
vector <string> ids = filter_string_explode (response, '\n');
for (auto & id : ids) server_identifiers.push_back (convert_to_int (id));
}
// Any identifiers on the client, but not on the server, remove them from the client.
vector <int> remove_identifiers = filter_string_array_diff (client_identifiers, server_identifiers);
for (auto & id : remove_identifiers) {
database_modifications.deleteNotification (id);
request.database_config_user ()->setChangeNotificationsChecksum ("");
Database_Logs::log (sendreceive_changes_text () + "Removing notification: " + convert_to_string (id), Filter_Roles::translator ());
}
// Any identifiers on the server, but not on the client, download them from the server.
vector <int> download_identifiers = filter_string_array_diff (server_identifiers, client_identifiers);
for (auto & id : download_identifiers) {
sendreceive_changes_kick_watchdog ();
Database_Logs::log (sendreceive_changes_text () + "Downloading notification: " + convert_to_string (id), Filter_Roles::translator ());
post ["a"] = convert_to_string (Sync_Logic::changes_get_modification);
post ["i"] = convert_to_string (id);
response = sync_logic.post (post, url, error);
if (!error.empty ()) {
Database_Logs::log (sendreceive_changes_text () + "Failure downloading notification: " + error, Filter_Roles::translator ());
}
else {
// The server has put all bits together, one bit per line.
vector <string> lines = filter_string_explode (response, '\n');
string category;
if (!lines.empty ()) {
category = lines [0];
lines.erase (lines.begin ());
}
string bible;
if (!lines.empty ()) {
bible = lines [0];
lines.erase (lines.begin ());
}
int book = 0;
if (!lines.empty ()) {
book = convert_to_int (lines [0]);
lines.erase (lines.begin ());
}
int chapter = 0;
if (!lines.empty ()) {
chapter = convert_to_int (lines [0]);
lines.erase (lines.begin ());
}
int verse = 0;
if (!lines.empty ()) {
verse = convert_to_int (lines [0]);
lines.erase (lines.begin ());
}
string oldtext;
if (!lines.empty ()) {
oldtext = lines [0];
lines.erase (lines.begin ());
}
string modification;
if (!lines.empty ()) {
modification = lines [0];
lines.erase (lines.begin ());
}
string newtext;
if (!lines.empty ()) {
newtext = lines [0];
lines.erase (lines.begin ());
}
database_modifications.storeClientNotification (id, user, category, bible, book, chapter, verse, oldtext, modification, newtext);
request.database_config_user ()->setChangeNotificationsChecksum ("");
}
}
// Done.
Database_Logs::log (sendreceive_changes_text () + "Ready", Filter_Roles::translator ());
send_receive_changes_done ();
}
string sync_files (void * webserver_request)
{
Webserver_Request * request = (Webserver_Request *) webserver_request;
Sync_Logic sync_logic = Sync_Logic (webserver_request);
if (!sync_logic.security_okay ()) {
// When the Cloud enforces https, inform the client to upgrade.
request->response_code = 426;
return "";
}
// If the client's IP address very recently made a prioritized server call,
// then delay the current call.
// This is the way to give priority to the other call:
// Not clogging the client's internet connection.
if (sync_logic.prioritized_ip_address_active ()) {
this_thread::sleep_for (chrono::seconds (5));
}
if (request->post.empty ()) {
request->post = request->query;
}
string user = hex2bin (request->post ["u"]);
int action = convert_to_int (request->post ["a"]);
int version = convert_to_int (request->post ["v"]);
size_t d = convert_to_int (request->post ["d"]);
string file = request->post ["f"];
// For security reasons a client does not specify the directory of the file to be downloaded.
// Rather it specifies the offset within the list of allowed directories for the version.
vector <string> directories = Sync_Logic::files_get_directories (version, user);
if (d >= directories.size ()) {
request->response_code = 400;
return "";
}
string directory = directories [d];
if (action == Sync_Logic::files_total_checksum) {
return convert_to_string (Sync_Logic::files_get_total_checksum (version, user));
}
else if (action == Sync_Logic::files_directory_checksum) {
int checksum = Sync_Logic::files_get_directory_checksum (directory);
return convert_to_string (checksum);
}
else if (action == Sync_Logic::files_directory_files) {
vector <string> paths = Sync_Logic::files_get_files (directory);
return filter_string_implode (paths, "\n");
}
else if (action == Sync_Logic::files_file_checksum) {
int checksum = Sync_Logic::files_get_file_checksum (directory, file);
return convert_to_string (checksum);
}
else if (action == Sync_Logic::files_file_download) {
// This triggers the correct mime type.
request->get = "file.download";
// Return the file's contents.
string path = filter_url_create_root_path (directory, file);
return filter_url_file_get_contents (path);
}
// Bad request. Delay flood of bad requests.
this_thread::sleep_for (chrono::seconds (1));
request->response_code = 400;
return "";
}
