CLOUD: Add Dropbox into CloudManager's configs

This commit adds:
* ConfMan's new "cloud" domain;
* CloudManager's init() method, where it loads keys from "cloud" configs
domain;
* CurlJsonRequest's addHeader() and addPostField() methods;
* temporary Storage's printInfo() method;
* DropboxStorage's implementation of printInfo(), which is using access
token and user id;
* DropboxStorage's loadFromConfig() static method to load access token
and user id from configs and create a Storage instance with those;
* temporary DropboxStorage's authThroughConsole() static method, which
guides user through auth process from the console.

So, in CloudManager's init() implementation ScummVM checks that there is
"current_storage_type" key in "cloud" domain of configs, and loads
corresponding storage if there is such key.

If there is no such key, ScummVM offers user to auth with Dropbox.
That's done through console, and thus it's temporary (it also requires
restarting ScummVM twice and manually editing config.ini file).

backends/cloud/dropbox/dropboxstorage.cpp

@@ -23,6 +23,7 @@
 
 #include "backends/cloud/dropbox/dropboxstorage.h"
 #include "backends/networking/curl/curljsonrequest.h"
+#include "common/config-manager.h"
 #include "common/debug.h"
 #include "common/json.h"
 #include <curl/curl.h>
@@ -30,18 +31,44 @@
 namespace Cloud {
 namespace Dropbox {
 
-static void curlJsonCallback(void *ptr) {
+Common::String DropboxStorage::KEY; //can't use ConfMan there yet, loading it on instance creation/auth
+Common::String DropboxStorage::SECRET; //TODO: hide these secrets somehow
+
+static void printJsonCallback(void *ptr) {
 	Common::JSONValue *json = (Common::JSONValue *)ptr;
 	if (json) {
-		debug("curlJsonCallback:");
+		debug("printJsonCallback:");
 		debug("%s", json->stringify(true).c_str());
 		delete json;
 	} else {
-		debug("curlJsonCallback: got NULL instead of JSON!");
+		debug("printJsonCallback: got NULL instead of JSON!");
 	}
 }
 
-DropboxStorage::DropboxStorage() {
+static void saveAccessTokenCallback(void *ptr) {
+	Common::JSONValue *json = (Common::JSONValue *)ptr;
+	if (json) {
+		debug("saveAccessTokenCallback:");
+		debug("%s", json->stringify(true).c_str());
+
+		Common::JSONObject result = json->asObject();
+		if (!result.contains("access_token") || !result.contains("uid")) {
+			warning("Bad response, no token/uid passed");
+		} else {
+			ConfMan.set("current_storage_type", "Dropbox", "cloud");
+			ConfMan.set("current_storage_access_token", result.getVal("access_token")->asString(), "cloud");
+			ConfMan.set("current_storage_user_id", result.getVal("uid")->asString(), "cloud");
+			ConfMan.removeKey("dropbox_code", "cloud");
+			debug("Now please restart ScummVM to apply the changes.");
+		}
+
+		delete json;
+	} else {
+		debug("saveAccessTokenCallback: got NULL instead of JSON!");
+	}
+}
+
+DropboxStorage::DropboxStorage(Common::String accessToken, Common::String userId): _token(accessToken), _uid(userId) {
 	curl_global_init(CURL_GLOBAL_ALL);
 }
 
@@ -54,9 +81,78 @@ void DropboxStorage::listDirectory(Common::String path) {
 }
 
 void DropboxStorage::syncSaves() {
-	//not so Dropbox, just testing JSON requesting & parsing:
-	addRequest(new Networking::CurlJsonRequest(curlJsonCallback, "https://api.vk.com/method/users.get?v=5.50&user_ids=205387401"));
-	addRequest(new Networking::CurlJsonRequest(curlJsonCallback, "https://api.vk.com/method/users.get?v=5.50&user_ids=28870501"));
+	//not syncing, but already something:
+	printInfo();
+}
+
+void DropboxStorage::printInfo() {
+	Networking::CurlJsonRequest *request = new Networking::CurlJsonRequest(printJsonCallback, "https://api.dropboxapi.com/1/account/info");
+	request->addHeader("Authorization: Bearer " + _token);
+	addRequest(request);
+}
+
+DropboxStorage *DropboxStorage::loadFromConfig() {
+	KEY = ConfMan.get("DROPBOX_KEY", "cloud");
+	SECRET = ConfMan.get("DROPBOX_SECRET", "cloud");
+
+	if (!ConfMan.hasKey("current_storage_access_token", "cloud")) {
+		warning("No access_token found");
+		return 0;
+	}
+
+	if (!ConfMan.hasKey("current_storage_user_id", "cloud")) {
+		warning("No user_id found");
+		return 0;
+	}
+
+	Common::String accessToken = ConfMan.get("current_storage_access_token", "cloud");
+	Common::String userId = ConfMan.get("current_storage_user_id", "cloud");
+	return new DropboxStorage(accessToken, userId);
+}
+
+Common::String DropboxStorage::getAuthLink() {
+	Common::String url = "https://www.dropbox.com/1/oauth2/authorize";
+	url += "?response_type=code";
+	url += "&redirect_uri=http://localhost:12345/"; //that's for copy-pasting
+	//url += "&redirect_uri=http%3A%2F%2Flocalhost%3A12345%2F"; //that's "http://localhost:12345/" for automatic opening
+	url += "&client_id=" + KEY;
+	return url;
+}
+
+DropboxStorage *DropboxStorage::authThroughConsole() {
+	if (!ConfMan.hasKey("DROPBOX_KEY", "cloud") || !ConfMan.hasKey("DROPBOX_SECRET", "cloud")) {
+		warning("No Dropbox keys available, cannot do auth");
+		return 0;
+	}
+
+	KEY = ConfMan.get("DROPBOX_KEY", "cloud");
+	SECRET = ConfMan.get("DROPBOX_SECRET", "cloud");
+
+	if (ConfMan.hasKey("dropbox_code", "cloud")) {
+		//phase 2: get access_token using specified code
+		return getAccessToken(ConfMan.get("dropbox_code", "cloud"));
+	}
+
+	debug("Navigate to this URL and press \"Allow\":");
+	debug("%s\n", getAuthLink().c_str());
+	debug("Then, add dropbox_code key in [cloud] section of configuration file. You should copy the <code> value from URL and put it as value for that key.\n");
+	debug("Navigate to this URL to get more information on ScummVM's configuration files:");
+	debug("http://wiki.scummvm.org/index.php/User_Manual/Configuring_ScummVM#Using_the_configuration_file_to_configure_ScummVM\n");
+	return 0;
+}
+
+DropboxStorage *DropboxStorage::getAccessToken(Common::String code) {
+	Networking::CurlJsonRequest *request = new Networking::CurlJsonRequest(saveAccessTokenCallback, "https://api.dropboxapi.com/1/oauth2/token");
+	request->addPostField("code=" + code);
+	request->addPostField("grant_type=authorization_code");
+	request->addPostField("client_id=" + KEY);
+	request->addPostField("client_secret=" + SECRET);
+	request->addPostField("&redirect_uri=http%3A%2F%2Flocalhost%3A12345%2F");
+	
+	//OK, that's not how I imagined that...	
+	DropboxStorage *storage = new DropboxStorage("", "");
+	storage->addRequest(request);
+	return storage;
 }
 
 } //end of namespace Dropbox

backends/cloud/dropbox/dropboxstorage.h

@@ -24,18 +24,47 @@
 #define BACKENDS_CLOUD_DROPBOX_STORAGE_H
 
 #include "backends/cloud/storage.h"
+#include "../manager.h"
 
-namespace Cloud { namespace Dropbox {
+namespace Cloud {
+namespace Dropbox {
 
 class DropboxStorage: public Cloud::Storage {
+	static Common::String KEY, SECRET;
+
+	Common::String _token, _uid;
+
+	/** This private constructor is called from loadFromConfig(). */
+	DropboxStorage(Common::String token, Common::String uid);
+
+	static DropboxStorage *getAccessToken(Common::String code);
+
 public:	
-	DropboxStorage();
 	virtual ~DropboxStorage();
 
 	virtual void listDirectory(Common::String path);
 	virtual void syncSaves();
+	virtual void printInfo();	
+	/**
+	* Load token and user id from configs and return DropboxStorage for those.	
+	* @return pointer to the newly created DropboxStorage or 0 if some problem occured.
+	*/
+	static DropboxStorage *loadFromConfig();
+
+	/**
+	* Returns Dropbox auth link.
+	*/
+	static Common::String DropboxStorage::getAuthLink();
+
+	/**
+	* Show message with Dropbox auth instructions. (Temporary)
+	* Returns temporary DropboxStorage, which does network requests
+	* to get access token.
+	*/
+	static DropboxStorage *authThroughConsole();
 };
 
-} }  //end of namespace Cloud::Dropbox
+} //end of namespace Dropbox
+} //end of namespace Cloud
 
 #endif

backends/cloud/manager.cpp

@@ -22,13 +22,26 @@
 
 #include "backends/cloud/manager.h"
 #include "backends/cloud/dropbox/dropboxstorage.h"
+#include "common/config-manager.h"
 
 namespace Cloud {
 
-Manager::Manager(): _currentStorage(new Dropbox::DropboxStorage()) {}
+Manager::Manager(): _currentStorage(0) {}
 
 Manager::~Manager() { delete _currentStorage; }
 
+void Manager::init() {
+	if (ConfMan.hasKey("current_storage_type", "cloud")) {
+		Common::String storageType = ConfMan.get("current_storage_type", "cloud");
+		if (storageType == "Dropbox") _currentStorage = Dropbox::DropboxStorage::loadFromConfig();
+		else warning("Unknown cloud storage type '%s' passed", storageType.c_str());
+	}
+	else {
+		//this is temporary console offer to auth with Dropbox (because there is no other storage type yet anyway)
+		Dropbox::DropboxStorage::authThroughConsole();
+	}
+}
+
 Storage* Manager::getCurrentStorage() {
 	return _currentStorage;
 }

backends/cloud/manager.h

@@ -35,6 +35,8 @@ public:
 	Manager();
 	virtual ~Manager();
 
+	virtual void init();
+
 	virtual Storage* getCurrentStorage();
 	virtual void syncSaves();
 };

backends/cloud/storage.h

@@ -63,6 +63,12 @@ public:
 	*/
 
 	virtual void syncSaves() = 0;
+
+	/**
+	* Prints user info on console. (Temporary)
+	*/
+
+	virtual void printInfo() = 0;
 };
 
 } //end of namespace Cloud

backends/networking/curl/connectionmanager.cpp

@@ -39,8 +39,8 @@ ConnectionManager::~ConnectionManager() {
 	curl_global_cleanup();
 }
 
-NetworkReadStream *ConnectionManager::makeRequest(const char *url) {
-	NetworkReadStream *stream = new NetworkReadStream(url);
+NetworkReadStream *ConnectionManager::makeRequest(const char *url, curl_slist *headersList, Common::String postFields) {
+	NetworkReadStream *stream = new NetworkReadStream(url, headersList, postFields);
 	curl_multi_add_handle(_multi, stream->getEasyHandle());
 	return stream;
 }

backends/networking/curl/connectionmanager.h

@@ -26,6 +26,7 @@
 #include "common/str.h"
 
 typedef void CURLM;
+struct curl_slist;
 
 namespace Networking {
 
@@ -38,7 +39,7 @@ public:
 	ConnectionManager();
 	virtual ~ConnectionManager();
 
-	NetworkReadStream *makeRequest(const char *url);
+	NetworkReadStream *makeRequest(const char *url, curl_slist *headersList, Common::String postFields);
 	void handle();
 };
 

backends/networking/curl/curljsonrequest.cpp

@@ -30,7 +30,7 @@
 
 namespace Networking {
 
-CurlJsonRequest::CurlJsonRequest(Callback cb, const char *url) : Request(cb), _stream(0), _contentsStream(DisposeAfterUse::YES) {
+CurlJsonRequest::CurlJsonRequest(Callback cb, const char *url) : Request(cb), _stream(0), _headersList(0), _contentsStream(DisposeAfterUse::YES) {
 	_url = url;
 }
 
@@ -57,7 +57,7 @@ char *CurlJsonRequest::getPreparedContents() {
 }
 
 bool CurlJsonRequest::handle(ConnectionManager &manager) {
-	if (!_stream) _stream = manager.makeRequest(_url);
+	if (!_stream) _stream = manager.makeRequest(_url, _headersList, _postFields);
 
 	if (_stream) {
 		const int kBufSize = 16*1024;
@@ -83,4 +83,16 @@ bool CurlJsonRequest::handle(ConnectionManager &manager) {
 	return false;
 }
 
+void CurlJsonRequest::addHeader(Common::String header) {
+	_headersList = curl_slist_append(_headersList, header.c_str());
+}
+
+void CurlJsonRequest::addPostField(Common::String keyValuePair) {
+	if (_postFields == "")
+		_postFields = keyValuePair;
+	else
+		_postFields += "&" + keyValuePair;
+}
+
+
 } //end of namespace Networking

backends/networking/curl/curljsonrequest.h

@@ -26,6 +26,8 @@
 #include "backends/cloud/request.h"
 #include "common/memstream.h"
 
+struct curl_slist;
+
 namespace Networking {
 
 class NetworkReadStream;
@@ -33,6 +35,8 @@ class NetworkReadStream;
 class CurlJsonRequest : public Cloud::Request {	
 	const char *_url;
 	NetworkReadStream *_stream;
+	curl_slist *_headersList;
+	Common::String _postFields;
 	Common::MemoryWriteStreamDynamic _contentsStream;
 
 	/** Prepares raw bytes from _contentsStream to be parsed with Common::JSON::parse(). */
@@ -43,6 +47,10 @@ public:
 	virtual ~CurlJsonRequest();
 
 	virtual bool handle(ConnectionManager &manager);
+
+	void addHeader(Common::String header);
+
+	void addPostField(Common::String header);
 };
 
 }  //end of namespace Networking

backends/networking/curl/networkreadstream.cpp

@@ -34,7 +34,9 @@ static size_t curlDataCallback(char *d, size_t n, size_t l, void *p) {
 	return 0;
 }
 
-NetworkReadStream::NetworkReadStream(const char *url): _easy(0), _eos(false), _requestComplete(false) {
+NetworkReadStream::NetworkReadStream(const char *url, curl_slist *headersList, Common::String postFields):
+	_easy(0), _eos(false), _requestComplete(false)
+{
 	_easy = curl_easy_init();
 	curl_easy_setopt(_easy, CURLOPT_WRITEFUNCTION, curlDataCallback);
 	curl_easy_setopt(_easy, CURLOPT_WRITEDATA, this); //so callback can call us
@@ -42,6 +44,9 @@ NetworkReadStream::NetworkReadStream(const char *url): _easy(0), _eos(false), _r
 	curl_easy_setopt(_easy, CURLOPT_HEADER, 0L);
 	curl_easy_setopt(_easy, CURLOPT_URL, url);
 	curl_easy_setopt(_easy, CURLOPT_VERBOSE, 0L);
+	curl_easy_setopt(_easy, CURLOPT_HTTPHEADER, headersList);
+	curl_easy_setopt(_easy, CURLOPT_POSTFIELDSIZE, postFields.size());
+	curl_easy_setopt(_easy, CURLOPT_COPYPOSTFIELDS, postFields.c_str());
 }
 
 NetworkReadStream::~NetworkReadStream() {

backends/networking/curl/networkreadstream.h

@@ -28,6 +28,7 @@
 #include "common/str.h"
 
 typedef void CURL;
+struct curl_slist;
 
 namespace Networking {
 
@@ -36,7 +37,7 @@ class NetworkReadStream: public Common::MemoryReadWriteStream {
 	bool _eos, _requestComplete;
 
 public:	
-	NetworkReadStream(const char *url);
+	NetworkReadStream(const char *url, curl_slist *headersList, Common::String postFields);
 	virtual ~NetworkReadStream();
 
 	CURL *getEasyHandle() const { return _easy; }

base/main.cpp

@@ -478,6 +478,7 @@ extern "C" int scummvm_main(int argc, const char * const argv[]) {
 #endif
 		
 #ifdef USE_CLOUD
+	system.getCloudManager()->init();
 	system.getCloudManager()->syncSaves();
 #endif
 

common/cloudmanager.h

@@ -29,8 +29,16 @@ namespace Common {
 
 class CloudManager {
 public:
-	CloudManager() {};
-	virtual ~CloudManager() {};
+	CloudManager() {}
+	virtual ~CloudManager() {}
+
+	/**
+	* Loads all information from configs and creates current Storage instance.
+	*
+	* @note It's called once on startup in scummvm_main().
+	*/
+
+	virtual void init() = 0;
 
 	/**
 	* Returns active Storage, which could be used to interact

common/config-manager.cpp

@@ -45,6 +45,10 @@ char const *const ConfigManager::kTransientDomain = "__TRANSIENT";
 char const *const ConfigManager::kKeymapperDomain = "keymapper";
 #endif
 
+#ifdef USE_CLOUD
+char const *const ConfigManager::kCloudDomain = "cloud";
+#endif
+
 #pragma mark -
 
 
@@ -66,6 +70,9 @@ void ConfigManager::copyFrom(ConfigManager &source) {
 	_defaultsDomain = source._defaultsDomain;
 #ifdef ENABLE_KEYMAPPER
 	_keymapperDomain = source._keymapperDomain;
+#endif
+#ifdef USE_CLOUD
+	_cloudDomain = source._cloudDomain;
 #endif
 	_domainSaveOrder = source._domainSaveOrder;
 	_activeDomainName = source._activeDomainName;
@@ -120,6 +127,10 @@ void ConfigManager::addDomain(const String &domainName, const ConfigManager::Dom
 #ifdef ENABLE_KEYMAPPER
 	} else if (domainName == kKeymapperDomain) {
 		_keymapperDomain = domain;
+#endif
+#ifdef USE_CLOUD
+	} else if (domainName == kCloudDomain) {		
+		_cloudDomain = domain;
 #endif
 	} else if (domain.contains("gameid")) {
 		// If the domain contains "gameid" we assume it's a game domain
@@ -160,6 +171,9 @@ void ConfigManager::loadFromStream(SeekableReadStream &stream) {
 #ifdef ENABLE_KEYMAPPER
 	_keymapperDomain.clear();
 #endif
+#ifdef USE_CLOUD
+	_cloudDomain.clear();
+#endif
 
 	// TODO: Detect if a domain occurs multiple times (or likewise, if
 	// a key occurs multiple times inside one domain).
@@ -272,6 +286,10 @@ void ConfigManager::flushToDisk() {
 	// Write the keymapper domain
 	writeDomain(*stream, kKeymapperDomain, _keymapperDomain);
 #endif
+#ifdef USE_CLOUD
+	// Write the cloud domain
+	writeDomain(*stream, kCloudDomain, _cloudDomain);
+#endif
 
 	DomainMap::const_iterator d;
 
@@ -358,6 +376,10 @@ const ConfigManager::Domain *ConfigManager::getDomain(const String &domName) con
 #ifdef ENABLE_KEYMAPPER
 	if (domName == kKeymapperDomain)
 		return &_keymapperDomain;
+#endif
+#ifdef USE_CLOUD
+	if (domName == kCloudDomain)
+		return &_cloudDomain;
 #endif
 	if (_gameDomains.contains(domName))
 		return &_gameDomains[domName];
@@ -378,6 +400,10 @@ ConfigManager::Domain *ConfigManager::getDomain(const String &domName) {
 #ifdef ENABLE_KEYMAPPER
 	if (domName == kKeymapperDomain)
 		return &_keymapperDomain;
+#endif
+#ifdef USE_CLOUD
+	if (domName == kCloudDomain)
+		return &_cloudDomain;
 #endif
 	if (_gameDomains.contains(domName))
 		return &_gameDomains[domName];

common/config-manager.h

@@ -94,6 +94,11 @@ public:
 	static char const *const kKeymapperDomain;
 #endif
 
+#ifdef USE_CLOUD
+	/** The name of cloud domain used to store user's tokens */
+	static char const *const kCloudDomain;
+#endif
+
 	void				loadDefaultConfigFile();
 	void				loadConfigFile(const String &filename);
 
@@ -188,6 +193,10 @@ private:
 	Domain			_keymapperDomain;
 #endif
 
+#ifdef USE_CLOUD
+	Domain			_cloudDomain;
+#endif
+
 	Array<String>	_domainSaveOrder;
 
 	String			_activeDomainName;