17 files changed, 353 insertions, 6 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 350dfea2..321cacf7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,6 +11,8 @@ cmake_policy(SET CMP0053 NEW)
 cmake_policy(SET CMP0063 NEW)
 
 option(EXPERIMENTAL_VIEWS "Install experimental views" OFF)
+#Do not enable this unless you actually distribute a custom extension.
+option(ENABLE_EXTENSION "Enable custom kube extensions" OFF)
 
 include(CPack)
 include(FeatureSummary)
@@ -41,3 +43,6 @@ add_subdirectory(applications)
 add_subdirectory(views)
 add_subdirectory(accounts)
 add_subdirectory(tests)
+if (${ENABLE_EXTENSION})
+    add_subdirectory(extensions)
+endif()
diff --git a/components/kube/qml/Kube.qml b/components/kube/qml/Kube.qml
index bb161d8e..61933908 100644
--- a/components/kube/qml/Kube.qml
+++ b/components/kube/qml/Kube.qml
@@ -160,6 +160,7 @@ Controls2.ApplicationWindow {
                 Repeater {
                     model: Kube.ExtensionModel {
                         id: extensionModel
+                        extensionPoint: "views"
                         sortOrder: ["composer", "conversation", "people"]
                     }
                     Kube.IconButton {
diff --git a/extensions/CMakeLists.txt b/extensions/CMakeLists.txt
new file mode 100644
index 00000000..b8412096
--- /dev/null
+++ b/extensions/CMakeLists.txt
@@ -0,0 +1,7 @@
+macro(install_extension name extensionpoint)
+    install(DIRECTORY ${name}/qml/ DESTINATION ${QML_INSTALL_DIR}/org/kube/extensions/${extensionpoint}/${name})
+    #install(FILES ${name}/metadata.json DESTINATION ${QML_INSTALL_DIR}/org/kube/extensions/${name})
+endmacro()
+
+add_subdirectory(api)
+install_extension(fileasexpense mailview)
diff --git a/extensions/api/CMakeLists.txt b/extensions/api/CMakeLists.txt
new file mode 100644
index 00000000..82a5c7b0
--- /dev/null
+++ b/extensions/api/CMakeLists.txt
@@ -0,0 +1,12 @@
+include(GenerateExportHeader)
+include(ECMGenerateHeaders)
+include(CMakePackageConfigHelpers)
+
+set(EXTENSIONAPI_INSTALL_DIR ${QML_INSTALL_DIR}/org/kube/extensionapi)
+
+install(DIRECTORY qml/ DESTINATION ${EXTENSIONAPI_INSTALL_DIR})
+install(FILES qmldir DESTINATION ${EXTENSIONAPI_INSTALL_DIR})
+
+add_subdirectory(src)
+
+feature_summary(WHAT ALL FATAL_ON_MISSING_REQUIRED_PACKAGES)
diff --git a/extensions/api/qmldir b/extensions/api/qmldir
new file mode 100644
index 00000000..405785e5
--- /dev/null
+++ b/extensions/api/qmldir
@@ -0,0 +1,4 @@
+module org.kube.extensionapi
+depends org.kube.framework 1.0
+
+plugin extensionapiplugin
diff --git a/extensions/api/src/CMakeLists.txt b/extensions/api/src/CMakeLists.txt
new file mode 100644
index 00000000..f7e543dc
--- /dev/null
+++ b/extensions/api/src/CMakeLists.txt
@@ -0,0 +1,25 @@
+add_definitions("-Wall -std=c++14 -g")
+set(CMAKE_CXX_VISIBILITY_PRESET default)
+
+find_package(Qt5 COMPONENTS REQUIRED Core Concurrent Quick Qml WebEngineWidgets Test WebEngine Gui)
+find_package(KF5Mime 4.87.0 CONFIG REQUIRED)
+find_package(Sink 0.6.0 CONFIG REQUIRED)
+
+include_directories(../../../framework/src/domain/mime ${KMIME_INCLUDES})
+
+add_library(extensionapiplugin SHARED extensionapiplugin.cpp extensionapi.cpp)
+target_link_libraries(extensionapiplugin
+    kubeframework
+    KF5::Mime
+    sink
+    Qt5::Core
+    Qt5::Quick
+    Qt5::Qml
+    Qt5::WebEngineWidgets
+    Qt5::Test
+    Qt5::WebEngine
+    Qt5::Gui
+)
+install(TARGETS extensionapiplugin DESTINATION ${EXTENSIONAPI_INSTALL_DIR})
+
+feature_summary(WHAT ALL FATAL_ON_MISSING_REQUIRED_PACKAGES)
diff --git a/extensions/api/src/extensionapi.cpp b/extensions/api/src/extensionapi.cpp
new file mode 100644
index 00000000..3e6689b9
--- /dev/null
+++ b/extensions/api/src/extensionapi.cpp
@@ -0,0 +1,89 @@
+/*
+    Copyright (c) 2018 Christian Mollekopf <mollekopf@kolabsys.com>
+
+    This library is free software; you can redistribute it and/or modify it
+    under the terms of the GNU Library General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or (at your
+    option) any later version.
+
+    This library 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 Library General Public
+    License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to the
+    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+    02110-1301, USA.
+*/
+#include "extensionapi.h"
+
+#include <mailtemplates.h>
+#include <KMime/KMimeMessage>
+#include <sink/store.h>
+#include <sink/log.h>
+
+#include <QDebug>
+
+static void send(const QByteArray &message, const QByteArray &accountId)
+{
+    using namespace Sink;
+    using namespace Sink::ApplicationDomain;
+
+    Q_ASSERT(!accountId.isEmpty());
+    Query query;
+    query.containsFilter<SinkResource::Capabilities>(ResourceCapabilities::Mail::transport);
+    query.filter<SinkResource::Account>(accountId);
+    auto job = Store::fetchAll<SinkResource>(query)
+        .then([=](const QList<SinkResource::Ptr> &resources) {
+            if (!resources.isEmpty()) {
+                auto resourceId = resources[0]->identifier();
+                SinkLog() << "Sending message via resource: " << resourceId;
+                Mail mail(resourceId);
+                mail.setMimeMessage(message);
+                return Store::create(mail)
+                    .then<void>([=] {
+                        //Trigger a sync, but don't wait for it.
+                        Store::synchronize(Sink::SyncScope{}.resourceFilter(resourceId)).exec();
+                    });
+            }
+            SinkWarning() << "Failed to find a mailtransport resource";
+            return KAsync::error<void>(0, "Failed to find a MailTransport resource.");
+        })
+        .then([&] (const KAsync::Error &) {
+            SinkLog() << "Message was sent: ";
+        });
+    job.exec();
+}
+
+static QStringList toStringList(const QVariantList &list)
+{
+    QStringList s;
+    for (const auto &e : list) {
+        s << e.toString();
+    }
+    return s;
+}
+
+Q_INVOKABLE void ExtensionApi::forwardMail(const QVariantMap &map)
+{
+    SinkLog() << "Forwarding mail " << map;
+    auto mailObject = map.value("mail").value<Sink::ApplicationDomain::Mail::Ptr>();
+    Q_ASSERT(mailObject);
+    KMime::Message::Ptr msg(new KMime::Message);
+    msg->setContent(KMime::CRLFtoLF(mailObject->getMimeMessage()));
+    msg->parse();
+
+    MailTemplates::forward(msg, [map] (const KMime::Message::Ptr &fwdMessage) {
+        auto msg = fwdMessage;
+        msg->subject()->fromUnicodeString(map.value("subject").toString(), "utf8");
+        auto list = toStringList(map.value("to").toList());
+        for (const auto &address : list) {
+            KMime::Types::Mailbox mb;
+            mb.fromUnicodeString(address);
+            msg->to()->addAddress(mb);
+        }
+        msg->assemble();
+        send(msg->encodedContent(true), map.value("accountId").toByteArray());
+    });
+}
diff --git a/extensions/api/src/extensionapi.h b/extensions/api/src/extensionapi.h
new file mode 100644
index 00000000..305d1206
--- /dev/null
+++ b/extensions/api/src/extensionapi.h
@@ -0,0 +1,30 @@
+/*
+    Copyright (c) 2018 Christian Mollekopf <mollekopf@kolabsys.com>
+
+    This library is free software; you can redistribute it and/or modify it
+    under the terms of the GNU Library General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or (at your
+    option) any later version.
+
+    This library 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 Library General Public
+    License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to the
+    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+    02110-1301, USA.
+*/
+
+#pragma once
+
+#include <QObject>
+
+class ExtensionApi : public QObject
+{
+    Q_OBJECT
+
+public:
+    Q_INVOKABLE void forwardMail(const QVariantMap &map);
+};
diff --git a/extensions/api/src/extensionapiplugin.cpp b/extensions/api/src/extensionapiplugin.cpp
new file mode 100644
index 00000000..3f399e36
--- /dev/null
+++ b/extensions/api/src/extensionapiplugin.cpp
@@ -0,0 +1,42 @@
+/*
+    Copyright (c) 2018 Christian Mollekopf <mollekopf@kolabsys.com>
+
+    This library is free software; you can redistribute it and/or modify it
+    under the terms of the GNU Library General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or (at your
+    option) any later version.
+
+    This library 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 Library General Public
+    License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to the
+    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+    02110-1301, USA.
+*/
+
+#include "extensionapiplugin.h"
+
+#include "extensionapi.h"
+
+#include <QtQml>
+
+void ExtensionApiPlugin::initializeEngine(QQmlEngine *engine, const char *uri)
+{
+    Q_UNUSED(uri);
+    Q_UNUSED(engine);
+}
+
+static QObject *extensionApiSingleton(QQmlEngine *engine, QJSEngine *scriptEngine)
+{
+    Q_UNUSED(engine)
+    Q_UNUSED(scriptEngine)
+    return new ExtensionApi;
+}
+
+void ExtensionApiPlugin::registerTypes (const char *uri)
+{
+    qmlRegisterSingletonType<ExtensionApi>(uri, 1, 0, "ExtensionApi", extensionApiSingleton);
+}
diff --git a/extensions/api/src/extensionapiplugin.h b/extensions/api/src/extensionapiplugin.h
new file mode 100644
index 00000000..e23e5cc4
--- /dev/null
+++ b/extensions/api/src/extensionapiplugin.h
@@ -0,0 +1,33 @@
+/*
+    Copyright (c) 2018 Christian Mollekopf <mollekopf@kolabsys.com>
+
+    This library is free software; you can redistribute it and/or modify it
+    under the terms of the GNU Library General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or (at your
+    option) any later version.
+
+    This library 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 Library General Public
+    License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to the
+    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+    02110-1301, USA.
+*/
+
+#pragma once
+
+#include <QQmlEngine>
+#include <QQmlExtensionPlugin>
+
+class ExtensionApiPlugin : public QQmlExtensionPlugin
+{
+    Q_OBJECT
+    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+
+public:
+    void registerTypes(const char *uri) Q_DECL_OVERRIDE;
+    void initializeEngine(QQmlEngine *engine, const char *uri) Q_DECL_OVERRIDE;
+};
diff --git a/extensions/fileasexpense/qml/main.qml b/extensions/fileasexpense/qml/main.qml
new file mode 100644
index 00000000..b53951f2
--- /dev/null
+++ b/extensions/fileasexpense/qml/main.qml
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2017 Christian Mollekopf, <mollekopf@kolabsys.com>
+ *
+ * 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.
+ */
+
+import QtQuick 2.7
+import org.kube.framework 1.0 as Kube
+import org.kube.extensionapi 1.0
+
+Kube.Button {
+    property variant context: {}
+    visible: true
+    activeFocusOnTab: false
+
+    text: qsTr("File as Expense")
+    onClicked: {
+        ExtensionApi.forwardMail({mail: context.mail, to: ["test1@kolab.org"], subject: "Expense: " + context.subject, accountId: context.accountId})
+    }
+}
diff --git a/framework/qml/ExtensionPoint.qml b/framework/qml/ExtensionPoint.qml
new file mode 100644
index 00000000..4f66b20e
--- /dev/null
+++ b/framework/qml/ExtensionPoint.qml
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2017 Christian Mollekopf, <mollekopf@kolabsys.com>
+ *
+ * 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.
+ */
+
+import QtQuick 2.7
+
+import org.kube.framework 1.0 as Kube
+
+Repeater {
+    id: root
+    property alias extensionPoint: extensionModel.extensionPoint
+    property variant context: {}
+
+    model: Kube.ExtensionModel {
+        id: extensionModel
+    }
+    Loader {
+        source: root.model.findSource(model.name, "main.qml")
+        onLoaded: {
+            item.context = root.context
+        }
+    }
+}
diff --git a/framework/qml/MailViewer.qml b/framework/qml/MailViewer.qml
index 2a1af3a6..e9759d72 100644
--- a/framework/qml/MailViewer.qml
+++ b/framework/qml/MailViewer.qml
@@ -348,6 +348,8 @@ Rectangle {
     }
     Item {
         id: footer
+        property var mail: model.mail
+        property string subject: model.subject
 
         anchors.bottom: parent.bottom
 
@@ -373,13 +375,12 @@ Rectangle {
             }
         }
 
-        Grid {
+        Row {
             anchors {
                 verticalCenter: parent.verticalCenter
                 right: parent.right
                 rightMargin: Kube.Units.largeSpacing
             }
-            columns: 2
             spacing: Kube.Units.smallSpacing
 
             Kube.Button {
@@ -405,6 +406,12 @@ Rectangle {
                     }
                 }
             }
+            Row {
+                Kube.ExtensionPoint {
+                    extensionPoint: "extensions/mailview"
+                    context: {"mail": footer.mail, "subject": footer.subject, "accountId": currentAccount}
+                }
+            }
         }
     }
 
diff --git a/framework/qmldir b/framework/qmldir
index 80146b8e..4a6f40ef 100644
--- a/framework/qmldir
+++ b/framework/qmldir
@@ -45,6 +45,7 @@ TreeView 1.0 TreeView.qml
 GridView 1.0 GridView.qml
 ScrollHelper 1.0 ScrollHelper.qml
 ModelIndexRetriever 1.0 ModelIndexRetriever.qml
+ExtensionPoint 1.0 ExtensionPoint.qml
 singleton Messages 1.0 Messages.qml
 singleton Notifications 1.0 Notifications.qml
 singleton Colors 1.0 Colors.qml
diff --git a/framework/src/extensionmodel.cpp b/framework/src/extensionmodel.cpp
index e3fab7d8..5f42aa7a 100644
--- a/framework/src/extensionmodel.cpp
+++ b/framework/src/extensionmodel.cpp
@@ -47,12 +47,17 @@ QHash<int, QByteArray> ExtensionModel::roleNames() const
 
 void ExtensionModel::load()
 {
-    auto model = new QStandardItemModel(this);
-
+    if (auto m = sourceModel()) {
+        setSourceModel(nullptr);
+        delete m;
+    }
     auto engine = qmlEngine(this);
-    Q_ASSERT(engine);
+    if (!engine) {
+        return;
+    }
+    auto model = new QStandardItemModel(this);
     for (const auto &path : engine->importPathList()) {
-        QDir dir{path + "/org/kube/views"};
+        QDir dir{path + "/org/kube/" + mExtensionPoint};
         for (const auto &pluginName : dir.entryList(QDir::Dirs | QDir::NoDotAndDotDot)) {
             const auto pluginPath = dir.path() + "/" + pluginName;
             mPaths.insert(pluginName, pluginPath);
@@ -101,6 +106,17 @@ QVariantList ExtensionModel::sortOrder() const
     return {};
 }
 
+void ExtensionModel::setExtensionPoint(const QString &extensionPoint)
+{
+    mExtensionPoint = extensionPoint;
+    QTimer::singleShot(0, this, &ExtensionModel::load);
+}
+
+QString ExtensionModel::extensionPoint() const
+{
+    return mExtensionPoint;
+}
+
 QVariant ExtensionModel::data(const QModelIndex &idx, int role) const
 {
     return QSortFilterProxyModel::data(idx, role);
diff --git a/framework/src/extensionmodel.h b/framework/src/extensionmodel.h
index 5360cc2f..07601e57 100644
--- a/framework/src/extensionmodel.h
+++ b/framework/src/extensionmodel.h
@@ -29,6 +29,7 @@ class ExtensionModel : public QSortFilterProxyModel
     Q_OBJECT
 
     Q_PROPERTY(QVariantList sortOrder WRITE setSortOrder READ sortOrder)
+    Q_PROPERTY(QString extensionPoint WRITE setExtensionPoint READ extensionPoint)
 public:
 
     ExtensionModel(QObject *parent = Q_NULLPTR);
@@ -49,6 +50,9 @@ public:
     void setSortOrder(const QVariantList &order);
     QVariantList sortOrder() const;
 
+    void setExtensionPoint(const QString &order);
+    QString extensionPoint() const;
+
     Q_INVOKABLE QString findSource(const QString &extensionName, const QString &sourceName);
 
 private slots:
@@ -57,6 +61,7 @@ private slots:
 private:
     QStringList mSortOrder;
     QHash<QString, QString> mPaths;
+    QString mExtensionPoint;
 };
 
 }
diff --git a/views/conversation/qml/View.qml b/views/conversation/qml/View.qml
index 5f0d362d..c0e44144 100644
--- a/views/conversation/qml/View.qml
+++ b/views/conversation/qml/View.qml
@@ -26,6 +26,7 @@ import QtQuick.Layouts 1.1
 import org.kube.framework 1.0 as Kube
 
 FocusScope {
+    property alias currentAccount: accountFolderview.currentAccount
     SplitView {
         anchors.fill: parent
         Rectangle {