CLOUD: Add GoogleDriveListDirectoryRequest

When listing directories, you get a list of StorageFiles, which path()
is actually Google Drive id. Thus, if you list a directory recursively,
you won't be able to determine whether all files are within one
directory or have some hierarchy. I'd fix that as soon as it would be
needed.

4 files changed, 187 insertions, 3 deletions

diff --git a/backends/cloud/googledrive/googledrivelistdirectoryrequest.cpp b/backends/cloud/googledrive/googledrivelistdirectoryrequest.cpp
new file mode 100644
index 0000000000..803682b684
--- /dev/null
+++ b/backends/cloud/googledrive/googledrivelistdirectoryrequest.cpp
@@ -0,0 +1,117 @@
+/* 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/googledrivelistdirectoryrequest.h"
+#include "backends/cloud/googledrive/googledrivestorage.h"
+
+namespace Cloud {
+namespace GoogleDrive {
+
+GoogleDriveListDirectoryRequest::GoogleDriveListDirectoryRequest(GoogleDriveStorage *storage, Common::String path, Storage::ListDirectoryCallback cb, Networking::ErrorCallback ecb, bool recursive):
+	Networking::Request(nullptr, ecb),
+	_requestedPath(path), _requestedRecursive(recursive), _storage(storage), _listDirectoryCallback(cb),
+	_workingRequest(nullptr), _ignoreCallback(false) {
+	start();
+}
+
+GoogleDriveListDirectoryRequest::~GoogleDriveListDirectoryRequest() {
+	_ignoreCallback = true;
+	if (_workingRequest) _workingRequest->finish();
+	delete _listDirectoryCallback;
+}
+
+void GoogleDriveListDirectoryRequest::start() {
+	//cleanup
+	_ignoreCallback = true;
+	if (_workingRequest) _workingRequest->finish();
+	_workingRequest = nullptr;
+	_files.clear();
+	_directoriesQueue.clear();
+	_currentDirectory = "";
+	_ignoreCallback = false;
+
+	//find out that directory's id
+	Storage::UploadCallback innerCallback = new Common::Callback<GoogleDriveListDirectoryRequest, Storage::UploadResponse>(this, &GoogleDriveListDirectoryRequest::idResolvedCallback);
+	Networking::ErrorCallback innerErrorCallback = new Common::Callback<GoogleDriveListDirectoryRequest, Networking::ErrorResponse>(this, &GoogleDriveListDirectoryRequest::idResolveErrorCallback);
+	_workingRequest = _storage->resolveFileId(_requestedPath, innerCallback, innerErrorCallback);
+}
+
+void GoogleDriveListDirectoryRequest::idResolvedCallback(Storage::UploadResponse response) {
+	_workingRequest = nullptr;
+	if (_ignoreCallback) return;
+
+	_directoriesQueue.push_back(response.value.path());
+	listNextDirectory();
+}
+
+void GoogleDriveListDirectoryRequest::idResolveErrorCallback(Networking::ErrorResponse error) {
+	_workingRequest = nullptr;
+	if (_ignoreCallback) return;
+	finishError(error);
+}
+
+void GoogleDriveListDirectoryRequest::listNextDirectory() {
+	if (_directoriesQueue.empty()) {
+		finishSuccess(_files);
+		return;
+	}
+
+	_currentDirectory = _directoriesQueue.back();
+	_directoriesQueue.pop_back();
+
+	Storage::FileArrayCallback callback = new Common::Callback<GoogleDriveListDirectoryRequest, Storage::FileArrayResponse>(this, &GoogleDriveListDirectoryRequest::listedDirectoryCallback);
+	Networking::ErrorCallback failureCallback = new Common::Callback<GoogleDriveListDirectoryRequest, Networking::ErrorResponse>(this, &GoogleDriveListDirectoryRequest::listedDirectoryErrorCallback);	
+	_workingRequest = _storage->listDirectoryById(_currentDirectory, callback, failureCallback);
+}
+
+void GoogleDriveListDirectoryRequest::listedDirectoryCallback(Storage::FileArrayResponse response) {
+	_workingRequest = nullptr;
+	if (_ignoreCallback) return;
+
+	for (uint32 i = 0; i < response.value.size(); ++i) {
+		StorageFile &file = response.value[i];
+		_files.push_back(file);
+		if (_requestedRecursive && file.isDirectory()) {
+			_directoriesQueue.push_back(file.path());
+		}
+	}
+
+	listNextDirectory();
+}
+
+void GoogleDriveListDirectoryRequest::listedDirectoryErrorCallback(Networking::ErrorResponse error) {
+	_workingRequest = nullptr;
+	if (_ignoreCallback) return;
+	finishError(error);
+}
+
+void GoogleDriveListDirectoryRequest::handle() {}
+
+void GoogleDriveListDirectoryRequest::restart() { start(); }
+
+void GoogleDriveListDirectoryRequest::finishSuccess(Common::Array<StorageFile> &files) {
+	Request::finishSuccess();
+	if (_listDirectoryCallback) (*_listDirectoryCallback)(Storage::ListDirectoryResponse(this, files));
+}
+
+} // End of namespace GoogleDrive
+} // End of namespace Cloud
diff --git a/backends/cloud/googledrive/googledrivelistdirectoryrequest.h b/backends/cloud/googledrive/googledrivelistdirectoryrequest.h
new file mode 100644
index 0000000000..3eee83fed1
--- /dev/null
+++ b/backends/cloud/googledrive/googledrivelistdirectoryrequest.h
@@ -0,0 +1,65 @@
+/* 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.
+*
+*/
+
+#ifndef BACKENDS_CLOUD_GOOGLEDRIVE_GOOGLEDRIVELISTDIRECTORYREQUEST_H
+#define BACKENDS_CLOUD_GOOGLEDRIVE_GOOGLEDRIVELISTDIRECTORYREQUEST_H
+
+#include "backends/cloud/storage.h"
+#include "backends/networking/curl/curljsonrequest.h"
+#include "backends/networking/curl/request.h"
+#include "common/callback.h"
+
+namespace Cloud {
+namespace GoogleDrive {
+
+class GoogleDriveStorage;
+
+class GoogleDriveListDirectoryRequest: public Networking::Request {
+	Common::String _requestedPath;
+	bool _requestedRecursive;
+	GoogleDriveStorage *_storage;
+	Storage::ListDirectoryCallback _listDirectoryCallback;
+	Common::Array<StorageFile> _files;
+	Common::Array<Common::String> _directoriesQueue;
+	Common::String _currentDirectory;
+	Request *_workingRequest;
+	bool _ignoreCallback;
+
+	void start();
+	void idResolvedCallback(Storage::UploadResponse response);
+	void idResolveErrorCallback(Networking::ErrorResponse error);
+	void listNextDirectory();
+	void listedDirectoryCallback(Storage::FileArrayResponse response);
+	void listedDirectoryErrorCallback(Networking::ErrorResponse error);
+	void finishSuccess(Common::Array<StorageFile> &files);
+public:
+	GoogleDriveListDirectoryRequest(GoogleDriveStorage *storage, Common::String path, Storage::ListDirectoryCallback cb, Networking::ErrorCallback ecb, bool recursive = false);
+	virtual ~GoogleDriveListDirectoryRequest();
+
+	virtual void handle();
+	virtual void restart();
+};
+
+} // End of namespace GoogleDrive
+} // End of namespace Cloud
+
+#endif
diff --git a/backends/cloud/googledrive/googledriveresolveidrequest.cpp b/backends/cloud/googledrive/googledriveresolveidrequest.cpp
index 5dcb5c6e11..0ef0cd982f 100644
--- a/backends/cloud/googledrive/googledriveresolveidrequest.cpp
+++ b/backends/cloud/googledrive/googledriveresolveidrequest.cpp
@@ -53,7 +53,7 @@ void GoogleDriveResolveIdRequest::start() {
 	_currentDirectoryId = "appDataFolder";
 	_ignoreCallback = false;
 	
-	listNextDirectory(StorageFile("", 0, 0, false));
+	listNextDirectory(StorageFile(_currentDirectoryId, 0, 0, true));
 }
 
 void GoogleDriveResolveIdRequest::listNextDirectory(StorageFile fileToReturn) {
diff --git a/backends/cloud/googledrive/googledrivestorage.cpp b/backends/cloud/googledrive/googledrivestorage.cpp
index 1750dc9646..3c85b1f074 100644
--- a/backends/cloud/googledrive/googledrivestorage.cpp
+++ b/backends/cloud/googledrive/googledrivestorage.cpp
@@ -34,6 +34,7 @@
 #include "googledrivelistdirectorybyidrequest.h"
 #include "googledriveresolveidrequest.h"
 #include "googledrivecreatedirectoryrequest.h"
+#include "googledrivelistdirectoryrequest.h"
 
 namespace Cloud {
 namespace GoogleDrive {
@@ -238,8 +239,9 @@ Networking::Request *GoogleDriveStorage::resolveFileId(Common::String path, Uplo
 }
 
 Networking::Request *GoogleDriveStorage::listDirectory(Common::String path, ListDirectoryCallback callback, Networking::ErrorCallback errorCallback, bool recursive) {
-	//return addRequest(new GoogleDriveListDirectoryRequest(this, path, callback, errorCallback, recursive));
-	return nullptr;
+	if (!errorCallback) errorCallback = getErrorPrintingCallback();
+	if (!callback) callback = new Common::Callback<GoogleDriveStorage, FileArrayResponse>(this, &GoogleDriveStorage::printFiles);
+	return addRequest(new GoogleDriveListDirectoryRequest(this, path, callback, errorCallback, recursive));	
 }
 
 Networking::Request *GoogleDriveStorage::listDirectoryById(Common::String id, ListDirectoryCallback callback, Networking::ErrorCallback errorCallback) {