add Web Assembly support

CMakeLists.txt

@@ -30,6 +30,9 @@ option(USE_CODE_COVERAGE "Run code coverage reporting" OFF)
 if(WIN32 AND MINGW)
    option(WITH_DRMINGW "Include Dr. Mingw crash dumping (Windows only)" ON)
 endif()
+if(EMSCRIPTEN)
+   include(external/wasm.cmake)
+endif()
 
 find_package(Qt5 COMPONENTS REQUIRED Core Widgets Network OpenGL Test)
 

external/wasm.cmake

@@ -0,0 +1,59 @@
+# Configure WebAssembly build settings
+# For some reason, the build settings need to be provided through the linker.
+
+# Activate Embind C/C++ bindings
+# https://emscripten.org/docs/porting/connecting_cpp_and_javascript/embind.html
+add_link_options(--bind) 
+
+# Activate WebGL 2 (in addition to WebGL 1)
+# https://emscripten.org/docs/porting/multimedia_and_graphics/OpenGL-support.html#webgl-friendly-subset-of-opengl-es-2-0-3-0
+#add_link_options("SHELL:-s USE_WEBGL2=1")
+
+# Emulate missing OpenGL ES2/ES3 features
+# https://emscripten.org/docs/porting/multimedia_and_graphics/OpenGL-support.html#opengl-es-2-0-3-0-emulation
+add_link_options("SHELL:-s FULL_ES2=1")
+#add_link_options("SHELL:-s FULL_ES3=1")
+
+# Enable demangling of C++ stack traces
+# https://emscripten.org/docs/porting/Debugging.html
+add_link_options("SHELL:-s DEMANGLE_SUPPORT=1")
+
+# Run static dtors at teardown
+# https://emscripten.org/docs/getting_started/FAQ.html#what-does-exiting-the-runtime-mean-why-don-t-atexit-s-run
+add_link_options("SHELL:-s EXIT_RUNTIME=1")
+
+# Allows amount of memory used to change 
+# https://emscripten.org/docs/optimizing/Optimizing-Code.html#memory-growth
+add_link_options("SHELL:-s ALLOW_MEMORY_GROWTH=1")
+
+# Enable C++ exception catching
+# https://emscripten.org/docs/optimizing/Optimizing-Code.html#c-exceptions
+add_link_options("SHELL:-s DISABLE_EXCEPTION_CATCHING=0")
+
+add_link_options("SHELL:-s ASSERTIONS=1")
+
+# Generate HTML file for each executable
+#SET(CMAKE_EXECUTABLE_SUFFIX ".html")
+
+# Also search for packages beneath filesystem root (in addition to /emsdk_portable/sdk/system)
+list(APPEND CMAKE_FIND_ROOT_PATH "/")
+
+# Link to missing Qt libraries.
+# Temporary solution until Qt ship with proper CMake support for WebAssembly.
+function(link_qt_static target)
+    target_link_libraries(${target} PRIVATE
+    "${_qt5Core_install_prefix}/plugins/platforms/libqwasm.a"       # QWasmIntegrationPlugin
+    "${_qt5Core_install_prefix}/lib/libQt5EventDispatcherSupport.a"
+    "${_qt5Core_install_prefix}/lib/libQt5FontDatabaseSupport.a"
+    "${_qt5Core_install_prefix}/lib/libqtfreetype.a"
+    )
+
+    # copy in Qt HTML/JS launch files
+    set(APPNAME ${target})
+    configure_file("${_qt5Core_install_prefix}/plugins/platforms/wasm_shell.html"
+                   "${target}.html")
+    configure_file("${_qt5Core_install_prefix}/plugins/platforms/qtloader.js"
+                   qtloader.js COPYONLY)
+    configure_file("${_qt5Core_install_prefix}/plugins/platforms/qtlogo.svg"
+                   qtlogo.svg COPYONLY)
+endfunction()

src/CMakeLists.txt

@@ -492,13 +492,17 @@ add_executable(mmapper WIN32 MACOSX_BUNDLE
     ${mmapper_DATA}
 )
 
-target_link_libraries(mmapper PUBLIC
+target_link_libraries(mmapper PRIVATE
     Qt5::Core
     Qt5::Widgets
     Qt5::Network
     Qt5::OpenGL
 )
 
+if(EMSCRIPTEN)
+    link_qt_static(mmapper)
+endif()
+
 set_target_properties(
   mmapper PROPERTIES
   CXX_STANDARD 17
@@ -761,6 +765,13 @@ if(WIN32)
     set(CPACK_RESOURCE_FILE_LICENSE "${PROJECT_SOURCE_DIR}/src/resources/LICENSE.GPL2")
 endif(WIN32)
 
+if(EMSCRIPTEN)
+    set(APPNAME mmapper)
+    configure_file("${_qt5Core_install_prefix}/plugins/platforms/wasm_shell.html" "mmapper.html")
+    configure_file("${_qt5Core_install_prefix}/plugins/platforms/qtloader.js" "qtloader.js" COPYONLY)
+    configure_file("${_qt5Core_install_prefix}/plugins/platforms/qtlogo.svg" "qtlogo.svg" COPYONLY)
+endif()
+
 # Apple Install Settings
 if(APPLE)
     if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)

src/configuration/configuration.h

@@ -40,7 +40,7 @@ NODISCARD static inline constexpr PlatformEnum getCurrentPlatform()
     return PlatformEnum::Windows;
 #elif defined(Q_OS_MAC)
     return PlatformEnum::Mac;
-#elif defined(Q_OS_LINUX)
+#elif defined(Q_OS_LINUX) or defined(Q_OS_WASM)
     return PlatformEnum::Linux;
 #else
     throw std::runtime_error("unsupported platform");

src/display/Textures.cpp

@@ -182,7 +182,7 @@ NODISCARD static SharedMMTexture createDottedWall(const ExitDirEnum dir)
         tex.create();
         tex.setSize(SIZE, SIZE, 1);
         tex.setMipLevels(tex.maximumMipLevels());
-        tex.setFormat(QOpenGLTexture::TextureFormat::RGBA8_UNorm);
+        tex.setFormat(QOpenGLTexture::TextureFormat::RGBAFormat);
         tex.allocateStorage(QOpenGLTexture::PixelFormat::RGBA, QOpenGLTexture::PixelType::UInt8);
 
         tex.setData(QOpenGLTexture::PixelFormat::RGBA,

src/main.cpp

@@ -24,6 +24,11 @@
 #include <exchndl.h>
 #endif
 
+#ifdef Q_OS_WASM
+#include <QtPlugin>
+Q_IMPORT_PLUGIN(QWasmIntegrationPlugin)
+#endif
+
 // REVISIT: move splash files somewhere else?
 // (presumably not in the "root" src/ directory?)
 struct NODISCARD ISplash
@@ -176,6 +181,7 @@ int main(int argc, char **argv)
     }
 
     QApplication app(argc, argv);
+    QCoreApplication::addLibraryPath("./");
     tryInitDrMingw();
     auto tryLoadingWinSock = std::make_unique<WinSock>();
     setSurfaceFormat();

src/pandoragroup/GroupClient.cpp

@@ -318,9 +318,11 @@ void GroupClient::slot_connectionEncrypted()
         getAuthority()->setMetadata(secret,
                                     GroupMetadataEnum::LAST_LOGIN,
                                     QDateTime::currentDateTime().toString());
+#ifndef Q_OS_WASM
         getAuthority()->setMetadata(secret,
                                     GroupMetadataEnum::CERTIFICATE,
                                     socket.getPeerCertificate().toPem());
+#endif
         getAuthority()->setMetadata(secret,
                                     GroupMetadataEnum::PORT,
                                     QString("%1").arg(socket.getPeerPort()));

src/pandoragroup/GroupServer.cpp

@@ -370,11 +370,13 @@ void GroupServer::parseLoginInformation(GroupSocket *socket, const QVariantMap &
         for (const auto &target : clientsList) {
             if (socket == target)
                 continue;
+#ifndef Q_OS_WASM
             if (socket->getPeerCertificate() == target->getPeerCertificate()) {
                 kickConnection(target, "Someone reconnected to the server using your secret!");
                 reconnect = true;
                 break;
             }
+#endif
         }
 
     } else {
@@ -423,9 +425,11 @@ void GroupServer::parseLoginInformation(GroupSocket *socket, const QVariantMap &
         getAuthority()->setMetadata(secret,
                                     GroupMetadataEnum::LAST_LOGIN,
                                     QDateTime::currentDateTime().toString());
+#ifndef Q_OS_WASM
         getAuthority()->setMetadata(secret,
                                     GroupMetadataEnum::CERTIFICATE,
                                     socket->getPeerCertificate().toPem());
+#endif
     }
 
     // Strip protocolVersion from original QVariantMap

src/pandoragroup/GroupSocket.cpp

@@ -31,6 +31,7 @@ GroupSocket::GroupSocket(GroupAuthority *authority, QObject *parent)
     timer.setSingleShot(true);
     connect(&timer, &QTimer::timeout, this, &GroupSocket::slot_onTimeout);
 
+#ifndef Q_OS_WASM
     const auto get_ssl_config = [this, authority]() {
         auto config = socket.sslConfiguration();
         config.setCaCertificates({});
@@ -47,6 +48,7 @@ GroupSocket::GroupSocket(GroupAuthority *authority, QObject *parent)
     };
     socket.setSslConfiguration(get_ssl_config());
     socket.setPeerVerifyName(GROUP_COMMON_NAME);
+#endif
     connect(&socket, &QAbstractSocket::hostFound, this, [this]() {
         emit sig_sendLog("Host found...");
     });
@@ -60,13 +62,15 @@ GroupSocket::GroupSocket(GroupAuthority *authority, QObject *parent)
         emit sig_sendLog("Connection established...");
         emit sig_connectionEstablished(this);
     });
+#ifndef Q_OS_WASM
     connect(&socket, &QSslSocket::encrypted, this, [this]() {
         timer.stop();
         secret
             = socket.peerCertificate().digest(QCryptographicHash::Algorithm::Sha1).toHex().toLower();
         emit sig_sendLog("Connection successfully encrypted...");
         emit sig_connectionEncrypted(this);
     });
+#endif
     connect(&socket, &QAbstractSocket::disconnected, this, [this]() {
         timer.stop();
         emit sig_connectionClosed(this);
@@ -76,7 +80,9 @@ GroupSocket::GroupSocket(GroupAuthority *authority, QObject *parent)
             QOverload<QAbstractSocket::SocketError>::of(&QAbstractSocket::errorOccurred),
             this,
             &GroupSocket::slot_onError);
+#ifndef Q_OS_WASM
     connect(&socket, &QSslSocket::peerVerifyError, this, &GroupSocket::slot_onPeerVerifyError);
+#endif
 }
 
 GroupSocket::~GroupSocket()
@@ -175,6 +181,7 @@ void GroupSocket::slot_onError(QAbstractSocket::SocketError e)
     }
 }
 
+#ifndef Q_OS_WASM
 void GroupSocket::slot_onPeerVerifyError(const QSslError &error)
 {
     // Ignore expected warnings
@@ -185,6 +192,7 @@ void GroupSocket::slot_onPeerVerifyError(const QSslError &error)
     qWarning() << "onPeerVerifyError" << static_cast<int>(socket.error()) << socket.errorString()
                << error.errorString();
 }
+#endif
 
 void GroupSocket::slot_onTimeout()
 {
@@ -193,6 +201,7 @@ void GroupSocket::slot_onTimeout()
         switch (protocolState) {
         case ProtocolStateEnum::Unconnected:
         case ProtocolStateEnum::AwaitingLogin:
+#ifndef Q_OS_WASM
             if (!socket.isEncrypted()) {
                 const QString msg = socket.isEncrypted() ? socket.errorString()
                                                          : "Connection not successfully encrypted";
@@ -202,6 +211,7 @@ void GroupSocket::slot_onTimeout()
             goto continue_common_timeout;
 
         continue_common_timeout:
+#endif
         case ProtocolStateEnum::AwaitingInfo:
             emit sig_errorInConnection(this, "Login timed out");
             break;

src/pandoragroup/GroupSocket.h

@@ -8,7 +8,11 @@
 #include <QByteArray>
 #include <QMap>
 #include <QObject>
+#ifndef Q_OS_WASM
 #include <QSslSocket>
+#else
+#include <QTcpSocket>
+#endif
 #include <QString>
 #include <QTimer>
 #include <QtCore>
@@ -31,15 +35,22 @@ class GroupSocket final : public QObject
     void setSocket(qintptr socketDescriptor);
     void connectToHost();
     void disconnectFromHost();
+#ifndef Q_OS_WASM
     void startServerEncrypted() { socket.startServerEncryption(); }
     void startClientEncrypted() { socket.startClientEncryption(); }
+#else
+    void startServerEncrypted() { assert(false); }
+    void startClientEncrypted() { assert(false); }
+#endif
 
     NODISCARD QByteArray getSecret() const { return secret; }
     NODISCARD QString getPeerName() const;
     NODISCARD quint16 getPeerPort() const { return socket.peerPort(); }
 
     NODISCARD QAbstractSocket::SocketError getSocketError() const { return socket.error(); }
+#ifndef Q_OS_WASM
     NODISCARD QSslCertificate getPeerCertificate() const { return socket.peerCertificate(); }
+#endif
 
     void setProtocolState(ProtocolStateEnum val);
     NODISCARD ProtocolStateEnum getProtocolState() const { return protocolState; }
@@ -54,7 +65,9 @@ class GroupSocket final : public QObject
 
 protected slots:
     void slot_onError(QAbstractSocket::SocketError socketError);
+#ifndef Q_OS_WASM
     void slot_onPeerVerifyError(const QSslError &error);
+#endif
     void slot_onReadyRead();
     void slot_onTimeout();
 
@@ -71,7 +84,11 @@ protected slots:
     void sendLog(const QString &msg) { emit sig_sendLog(msg); }
 
 private:
+#ifndef Q_OS_WASM
     QSslSocket socket;
+#else
+    QTcpSocket socket;
+#endif
     QTimer timer;
     GroupAuthority *const authority;
     void onReadInternal(char c);

src/pandoragroup/groupauthority.cpp

@@ -215,10 +215,12 @@ void GroupAuthority::refresh()
 #else
 void GroupAuthority::refresh()
 {
+#ifndef Q_OS_WASM
     certificate.clear();
     setConfig().groupManager.certificate = "";
     key.clear();
     setConfig().groupManager.privateKey = "";
+#endif
 }
 #endif
 
@@ -248,6 +250,7 @@ GroupAuthority::GroupAuthority(QObject *const parent)
     : QObject(parent)
 {
     qRegisterMetaType<GroupSecret>("GroupSecret");
+#ifndef Q_OS_WASM
 
     // Always utilize a temporary keychain
     qputenv("QT_SSL_USE_TEMPORARY_KEYCHAIN", "1");
@@ -279,12 +282,17 @@ GroupAuthority::GroupAuthority(QObject *const parent)
 
     // Prime model
     model.setStringList(groupManager.authorizedSecrets);
+#endif
 }
 
 GroupSecret GroupAuthority::getSecret() const
 {
+#ifndef Q_OS_WASM
     // SHA-1 isn't very secure but at 40 characters it fits within a line for tells
     return certificate.digest(QCryptographicHash::Algorithm::Sha1).toHex();
+#else
+    return "";
+#endif
 }
 
 bool GroupAuthority::add(const GroupSecret &secret)
@@ -339,6 +347,7 @@ bool GroupAuthority::validSecret(const GroupSecret &secret) const
 
 bool GroupAuthority::validCertificate(const GroupSocket *connection) const
 {
+#ifndef Q_OS_WASM
     const GroupSecret &targetSecret = connection->getSecret();
     const QString &storedCertificate = getMetadata(targetSecret, GroupMetadataEnum::CERTIFICATE);
     if (storedCertificate.isEmpty())
@@ -348,6 +357,9 @@ bool GroupAuthority::validCertificate(const GroupSocket *connection) const
     const bool certificatesMatch = targetCertficiate.compare(storedCertificate, Qt::CaseInsensitive)
                                    == 0;
     return certificatesMatch;
+#else
+    return false;
+#endif
 }
 
 QString GroupAuthority::getMetadata(const GroupSecret &secret, GroupMetadataEnum meta) const

src/pandoragroup/groupauthority.h

@@ -4,8 +4,10 @@
 // Author: Nils Schimmelmann <nschimme@gmail.com> (Jahara)
 
 #include <QObject>
+#ifndef Q_OS_WASM
 #include <QSslCertificate>
 #include <QSslKey>
+#endif
 #include <QStringListModel>
 
 #include "../global/macros.h"
@@ -34,8 +36,11 @@ public slots:
 
 public:
     NODISCARD GroupSecret getSecret() const;
+
+#ifndef Q_OS_WASM
     NODISCARD QSslCertificate getLocalCertificate() const { return certificate; }
     NODISCARD QSslKey getPrivateKey() const { return key; }
+#endif
 
 public:
     NODISCARD QAbstractItemModel *getItemModel() { return &model; }
@@ -54,6 +59,8 @@ public slots:
 
 private:
     QStringListModel model;
+#ifndef Q_OS_WASM
     QSslCertificate certificate;
     QSslKey key;
+#endif
 };