CLOUD: Add GoogleDriveResolveIdRequest

GoogleDriveResolveIdRequest gets a lowercase path and searches for the
specified file's id. To do that it lists path's subdirectories one by
one with GoogleDriveListDirectoryByIdRequest.

GoogleDriveListDirectoryByIdRequest gets a Google Drive id and lists
that directory (not recursively).

backends/cloud/googledrive/googledriveresolveidrequest.cpp

@@ -0,0 +1,128 @@
+/* ScummVM - Graphic Adventure Engine
+*
+* ScummVM is the legal property of its developers, whose names
+* are too numerous to list here. Please refer to the COPYRIGHT
+* file distributed with this source distribution.
+*
+* This program is free software; you can redistribute it and/or
+* modify it under the terms of the GNU General Public License
+* as published by the Free Software Foundation; either version 2
+* of the License, or (at your option) any later version.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with this program; if not, write to the Free Software
+* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+*
+*/
+
+#include "backends/cloud/googledrive/googledriveresolveidrequest.h"
+#include "backends/cloud/googledrive/googledrivestorage.h"
+#include "backends/cloud/googledrive/googledrivetokenrefresher.h"
+#include "backends/cloud/iso8601.h"
+#include "backends/networking/curl/connectionmanager.h"
+#include "backends/networking/curl/networkreadstream.h"
+#include "common/json.h"
+
+namespace Cloud {
+namespace GoogleDrive {
+
+GoogleDriveResolveIdRequest::GoogleDriveResolveIdRequest(GoogleDriveStorage *storage, Common::String path, Storage::UploadCallback cb, Networking::ErrorCallback ecb, bool recursive):
+	Networking::Request(nullptr, ecb),
+	_requestedPath(path), _storage(storage), _uploadCallback(cb),
+	_workingRequest(nullptr), _ignoreCallback(false) {
+	start();
+}
+
+GoogleDriveResolveIdRequest::~GoogleDriveResolveIdRequest() {
+	_ignoreCallback = true;
+	if (_workingRequest) _workingRequest->finish();
+	delete _uploadCallback;
+}
+
+void GoogleDriveResolveIdRequest::start() {
+	//cleanup
+	_ignoreCallback = true;
+	if (_workingRequest) _workingRequest->finish();
+	_workingRequest = nullptr;
+	_currentDirectory = "";
+	_currentDirectoryId = "appDataFolder";
+	_ignoreCallback = false;
+	
+	listNextDirectory(StorageFile("", 0, 0, false));
+}
+
+void GoogleDriveResolveIdRequest::listNextDirectory(StorageFile fileToReturn) {
+	if (_currentDirectory == _requestedPath) {		
+		finishFile(fileToReturn);
+		return;
+	}
+
+	Storage::FileArrayCallback callback = new Common::Callback<GoogleDriveResolveIdRequest, Storage::FileArrayResponse>(this, &GoogleDriveResolveIdRequest::listedDirectoryCallback);
+	Networking::ErrorCallback failureCallback = new Common::Callback<GoogleDriveResolveIdRequest, Networking::ErrorResponse>(this, &GoogleDriveResolveIdRequest::listedDirectoryErrorCallback);
+	_workingRequest = _storage->listDirectoryById(_currentDirectoryId, callback, failureCallback);
+}
+
+void GoogleDriveResolveIdRequest::listedDirectoryCallback(Storage::FileArrayResponse response) {	
+	_workingRequest = nullptr;
+	if (_ignoreCallback) return;
+	
+	Common::String currentLevelName = _requestedPath;
+	///debug("'%s'", currentLevelName.c_str());
+	if (_currentDirectory.size()) currentLevelName.erase(0, _currentDirectory.size());
+	if (currentLevelName.size() && (currentLevelName[0] == '/' || currentLevelName[0] == '\\')) currentLevelName.erase(0, 1);
+	///debug("'%s'", currentLevelName.c_str());
+	for (uint32 i = 0; i < currentLevelName.size(); ++i) {
+		if (currentLevelName[i] == '/' || currentLevelName[i] == '\\') {
+			currentLevelName.erase(i);
+			///debug("'%s'", currentLevelName.c_str());
+			break;
+		}
+	}
+
+	///debug("so, searching for '%s' in '%s'", currentLevelName.c_str(), _currentDirectory.c_str());
+
+	Common::Array<StorageFile> &files = response.value;
+	bool found = false;
+	for (uint32 i = 0; i < files.size(); ++i) {
+		if (files[i].isDirectory() && files[i].name() == currentLevelName) {
+			if (_currentDirectory != "") _currentDirectory += "/";
+			_currentDirectory += files[i].name();
+			_currentDirectoryId = files[i].path();
+			///debug("found it! new directory and its id: '%s', '%s'", _currentDirectory.c_str(), _currentDirectoryId.c_str());
+			listNextDirectory(files[i]);
+			found = true;
+			break;
+		}
+	}
+
+	if (!found) {
+		Common::String path = _currentDirectory;
+		if (path != "") path += "/";
+		path += currentLevelName;
+		if (path == _requestedPath) finishError(Networking::ErrorResponse(this, false, true, "no such file found in its parent directory", 404));
+		else finishError(Networking::ErrorResponse(this, false, true, "subdirectory not found", 400));
+	}
+}
+
+void GoogleDriveResolveIdRequest::listedDirectoryErrorCallback(Networking::ErrorResponse error) {
+	_workingRequest = nullptr;
+	if (_ignoreCallback) return;
+	finishError(error);
+}
+
+void GoogleDriveResolveIdRequest::handle() {}
+
+void GoogleDriveResolveIdRequest::restart() { start(); }
+
+void GoogleDriveResolveIdRequest::finishFile(StorageFile file) {
+	Request::finishSuccess();
+	if (_uploadCallback) (*_uploadCallback)(Storage::UploadResponse(this, file));
+}
+
+} // End of namespace GoogleDrive
+} // End of namespace Cloud