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// SPDX-FileCopyrightText: 2020 Kitsune Ral <kitsune-ral@users.sf.net>
// SPDX-License-Identifier: LGPL-2.1-or-later
#pragma once
#include "uri.h"
#include <QtCore/QObject>
#include <functional>
namespace Quotient {
class Connection;
class Room;
class User;
/*! \brief Abstract class to resolve the resource and act on it
*
* This class encapsulates the logic of resolving a Matrix identifier or URI
* into a Quotient object (or objects) and calling an appropriate handler on it.
* It is a type-safe way of handling a URI with no prior context on its type
* in cases like, e.g., when a user clicks on a URI in the application.
*
* This class provides empty "handlers" for each type of URI to facilitate
* gradual implementation. Derived classes are encouraged to override as many
* of them as possible.
*/
class UriResolverBase {
public:
/*! \brief Resolve the resource and dispatch an action depending on its type
*
* This method:
* 1. Resolves \p uri into an actual object (e.g., Room or User),
* with possible additional data such as event id, in the context of
* \p account.
* 2. If the resolving is successful, depending on the type of the object,
* calls the appropriate virtual function (defined in a derived
* concrete class) to perform an action on the resource (open a room,
* mention a user etc.).
* 3. Returns the result of resolving the resource.
*/
UriResolveResult visitResource(Connection* account, const Uri& uri);
protected:
virtual ~UriResolverBase() = 0;
/// Called by visitResource() when the passed URI identifies a Matrix user
/*!
* \return IncorrectAction if the action is not correct or not supported;
* UriResolved if it is accepted; other values are disallowed
*/
virtual UriResolveResult visitUser(User* user [[maybe_unused]],
const QString& action [[maybe_unused]])
{
return IncorrectAction;
}
/// Called by visitResource() when the passed URI identifies a room or
/// an event in a room
virtual void visitRoom(Room* room [[maybe_unused]],
const QString& eventId [[maybe_unused]])
{}
/// Called by visitResource() when the passed URI has `action() == "join"`
/// and identifies a room that the user defined by the Connection argument
/// is not a member of
virtual void joinRoom(Connection* account [[maybe_unused]],
const QString& roomAliasOrId [[maybe_unused]],
const QStringList& viaServers [[maybe_unused]] = {})
{}
/// Called by visitResource() when the passed URI has `type() == NonMatrix`
/*!
* Should return true if the URI is considered resolved, false otherwise.
* A basic implementation in a graphical client can look like
* `return QDesktopServices::openUrl(url);` but it's strongly advised to
* ask for a user confirmation beforehand.
*/
virtual bool visitNonMatrix(const QUrl& url [[maybe_unused]])
{
return false;
}
};
/*! \brief Resolve the resource and invoke an action on it, via function objects
*
* This function encapsulates the logic of resolving a Matrix identifier or URI
* into a Quotient object (or objects) and calling an appropriate handler on it.
* Unlike UriResolverBase it accepts the list of handlers from
* the caller; internally it's uses a minimal UriResolverBase class
*
* \param account The connection used as a context to resolve the identifier
*
* \param uri A URI that can represent a Matrix entity
*
* \param userHandler Called when the passed URI identifies a Matrix user
*
* \param roomEventHandler Called when the passed URI identifies a room or
* an event in a room
*
* \param joinHandler Called when the passed URI has `action() == "join"` and
* identifies a room that the user defined by
* the Connection argument is not a member of
*
* \param nonMatrixHandler Called when the passed URI has `type() == NonMatrix`;
* should return true if the URI is considered resolved,
* false otherwise
*
* \sa UriResolverBase, UriDispatcher
*/
UriResolveResult
visitResource(Connection* account, const Uri& uri,
std::function<UriResolveResult(User*, QString)> userHandler,
std::function<void(Room*, QString)> roomEventHandler,
std::function<void(Connection*, QString, QStringList)> joinHandler,
std::function<bool(const QUrl&)> nonMatrixHandler);
/*! \brief Check that the resource is resolvable with no action on it */
inline UriResolveResult checkResource(Connection* account, const Uri& uri)
{
return visitResource(
account, uri, [](auto, auto) { return UriResolved; }, [](auto, auto) {},
[](auto, auto, auto) {}, [](auto) { return false; });
}
/*! \brief Resolve the resource and invoke an action on it, via Qt signals
*
* This is an implementation of UriResolverBase that is based on
* QObject and uses Qt signals instead of virtual functions to provide an
* open-ended interface for visitors.
*
* This class is aimed primarily at clients where invoking the resolving/action
* and handling the action are happening in decoupled parts of the code; it's
* also useful to operate on Matrix identifiers and URIs from QML/JS code
* that cannot call resolveResource() due to QML/C++ interface limitations.
*
* This class does not restrain the client code to a certain type of
* connections: both direct and queued (or a mix) will work fine. One limitation
* caused by that is there's no way to indicate if a non-Matrix URI has been
* successfully resolved - a signal always returns void.
*
* Note that in case of using (non-blocking) queued connections the code that
* calls resolveResource() should not expect the action to be performed
* synchronously - the returned value is the result of resolving the URI,
* not acting on it.
*/
class UriDispatcher : public QObject, public UriResolverBase {
Q_OBJECT
public:
explicit UriDispatcher(QObject* parent = nullptr) : QObject(parent) {}
// It's actually UriResolverBase::visitResource() but with Q_INVOKABLE
Q_INVOKABLE UriResolveResult resolveResource(Connection* account,
const Uri& uri)
{
return UriResolverBase::visitResource(account, uri);
}
Q_SIGNALS:
/// An action on a user has been requested
void userAction(Quotient::User* user, QString action);
/// An action on a room has been requested, with optional event id
void roomAction(Quotient::Room* room, QString eventId);
/// A join action has been requested, with optional 'via' servers
void joinAction(Quotient::Connection* account, QString roomAliasOrId,
QStringList viaServers);
/// An action on a non-Matrix URL has been requested
void nonMatrixAction(QUrl url);
private:
UriResolveResult visitUser(User* user, const QString& action) override;
void visitRoom(Room* room, const QString& eventId) override;
void joinRoom(Connection* account, const QString& roomAliasOrId,
const QStringList& viaServers = {}) override;
bool visitNonMatrix(const QUrl& url) override;
};
} // namespace Quotient
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