feature(qchat): send a geojson layer through websocket

qtribu/gui/dck_qchat.py

@@ -1,5 +1,6 @@
 # standard
 import base64
+import json
 import os
 import tempfile
 from functools import partial
@@ -8,7 +9,7 @@
 
 # PyQGIS
 from PyQt5 import QtWebSockets  # noqa QGS103
-from qgis.core import Qgis, QgsApplication
+from qgis.core import Qgis, QgsApplication, QgsJsonExporter, QgsMapLayer
 from qgis.gui import QgisInterface, QgsDockWidget
 from qgis.PyQt import uic
 from qgis.PyQt.QtCore import QPoint, Qt
@@ -33,13 +34,16 @@
     QCHAT_NICKNAME_MINLENGTH,
 )
 from qtribu.gui.qchat_tree_widget_items import (
+    MESSAGE_COLUMN,
     QChatAdminTreeWidgetItem,
+    QChatGeojsonTreeWidgetItem,
     QChatImageTreeWidgetItem,
     QChatTextTreeWidgetItem,
 )
 from qtribu.logic.qchat_api_client import QChatApiClient
 from qtribu.logic.qchat_messages import (
     QChatExiterMessage,
+    QChatGeojsonMessage,
     QChatImageMessage,
     QChatLikeMessage,
     QChatNbUsersMessage,
@@ -149,6 +153,7 @@ def __init__(
         )
         self.qchat_ws.exiter_message_received.connect(self.on_exiter_message_received)
         self.qchat_ws.like_message_received.connect(self.on_like_message_received)
+        self.qchat_ws.geojson_message_received.connect(self.on_geojson_message_received)
 
         # send message signal listener
         self.lne_message.returnPressed.connect(self.on_send_button_clicked)
@@ -216,6 +221,11 @@ def on_widget_opened(self) -> None:
 
         self.cbb_room.currentIndexChanged.connect(self.on_room_changed)
 
+        # context menu on vector layer for sending as geojson in QChat
+        self.iface.layerTreeView().contextMenuAboutToShow.connect(
+            self.generate_qaction_send_geojson_layer
+        )
+
         # auto reconnect to room if needed
         if self.auto_reconnect_room:
             self.cbb_room.setCurrentText(self.auto_reconnect_room)
@@ -519,6 +529,14 @@ def on_like_message_received(self, message: QChatLikeMessage) -> None:
                     self.settings.qchat_ring_tone, self.settings.qchat_sound_volume
                 )
 
+    def on_geojson_message_received(self, message: QChatGeojsonMessage) -> None:
+        """
+        Launched when a geojson message is received from the websocket
+        """
+        item = QChatGeojsonTreeWidgetItem(self.twg_chat, message)
+        self.twg_chat.addTopLevelItem(item)
+        self.twg_chat.scrollToItem(item)
+
     # endregion
 
     def on_message_clicked(self, item: QTreeWidgetItem, column: int) -> None:
@@ -560,6 +578,17 @@ def on_custom_context_menu_requested(self, point: QPoint) -> None:
 
         menu = QMenu(self.tr("QChat Menu"), self)
 
+        # if this is a geojson
+        if type(item) is QChatGeojsonTreeWidgetItem:
+            load_geojson_action = QAction(
+                QgsApplication.getThemeIcon("mActionAddLayer.svg"),
+                self.tr("Load geojson in QGIS"),
+            )
+            load_geojson_action.triggered.connect(
+                partial(item.on_click, MESSAGE_COLUMN)
+            )
+            menu.addAction(load_geojson_action)
+
         # like message action if possible
         if item.can_be_liked:
             like_action = QAction(
@@ -732,6 +761,11 @@ def on_widget_closed(self) -> None:
         self.cbb_room.currentIndexChanged.disconnect()
         self.initialized = False
 
+        # remove context menu on vector layer for sending as geojson in QChat
+        self.iface.layerTreeView().contextMenuAboutToShow.disconnect(
+            self.generate_qaction_send_geojson_layer
+        )
+
     def check_cheatcode(self, text: str) -> bool:
         """
         Checks if a received message contains a cheatcode
@@ -783,3 +817,61 @@ def on_renew_clicked(self) -> None:
         return_value = msg_box.exec()
         if return_value == QMessageBox.Yes:
             open_url_in_webviewer("https://qgis.org/funding/donate/", "qgis.org")
+
+    def generate_qaction_send_geojson_layer(self, menu: QMenu) -> None:
+        menu.addSeparator()
+        send_geojson_action = QAction(
+            QgsApplication.getThemeIcon("mMessageLog.svg"),
+            self.tr("Send on QChat"),
+            self.iface.mainWindow(),
+        )
+        send_geojson_action.triggered.connect(self.on_send_layer_to_qchat)
+        menu.addAction(send_geojson_action)
+
+    def on_send_layer_to_qchat(self) -> None:
+        if not self.connected:
+            self.log(
+                message=self.tr(
+                    "Not connected to QChat. Please connect to a room first"
+                ),
+                application=self.tr("QChat"),
+                log_level=Qgis.Critical,
+                push=PlgOptionsManager().get_plg_settings().notify_push_info,
+                duration=PlgOptionsManager().get_plg_settings().notify_push_duration,
+            )
+            return
+        layer = self.iface.activeLayer()
+        if not layer:
+            self.log(
+                message=self.tr("No active layer in current QGIS project"),
+                application=self.tr("QChat"),
+                log_level=Qgis.Critical,
+                push=PlgOptionsManager().get_plg_settings().notify_push_info,
+                duration=PlgOptionsManager().get_plg_settings().notify_push_duration,
+            )
+            return
+        if layer.type() != QgsMapLayer.VectorLayer:
+            self.log(
+                message=self.tr("Only vector layers can be sent on QChat"),
+                application=self.tr("QChat"),
+                log_level=Qgis.Critical,
+                push=PlgOptionsManager().get_plg_settings().notify_push_info,
+                duration=PlgOptionsManager().get_plg_settings().notify_push_duration,
+            )
+            return
+
+        exporter = QgsJsonExporter(layer)
+        exporter.setSourceCrs(layer.crs())
+        exporter.setDestinationCrs(layer.crs())
+        exporter.setTransformGeometries(True)
+        geojson_str = exporter.exportFeatures(layer.getFeatures())
+        message = QChatGeojsonMessage(
+            type="geojson",
+            author=self.settings.author_nickname,
+            avatar=self.settings.author_avatar,
+            layer_name=layer.name(),
+            crs_wkt=layer.crs().toWkt(),
+            crs_authid=layer.crs().authid(),
+            geojson=json.loads(geojson_str),
+        )
+        self.qchat_ws.send_message(message)

qtribu/gui/qchat_tree_widget_items.py

@@ -1,7 +1,15 @@
 import base64
+import json
+import os
+import tempfile
 from typing import Optional
 
-from qgis.core import QgsApplication
+from qgis.core import (
+    QgsApplication,
+    QgsCoordinateReferenceSystem,
+    QgsProject,
+    QgsVectorLayer,
+)
 from qgis.PyQt.QtCore import QTime
 from qgis.PyQt.QtGui import QBrush, QColor, QIcon, QPixmap
 from qgis.PyQt.QtWidgets import (
@@ -13,7 +21,11 @@
 )
 
 from qtribu.constants import ADMIN_MESSAGES_AVATAR, ADMIN_MESSAGES_NICKNAME
-from qtribu.logic.qchat_messages import QChatImageMessage, QChatTextMessage
+from qtribu.logic.qchat_messages import (
+    QChatGeojsonMessage,
+    QChatImageMessage,
+    QChatTextMessage,
+)
 from qtribu.toolbelt import PlgOptionsManager
 from qtribu.toolbelt.preferences import PlgSettingsStructure
 
@@ -143,7 +155,7 @@ def can_be_copied_to_clipboard(self) -> bool:
         return True
 
     def copy_to_clipboard(self) -> None:
-        QgsApplication.instance().clipboard().setPixmap(self.message.text)
+        QgsApplication.instance().clipboard().setText(self.message.text)
 
 
 class QChatImageTreeWidgetItem(QChatTreeWidgetItem):
@@ -186,3 +198,42 @@ def can_be_copied_to_clipboard(self) -> bool:
 
     def copy_to_clipboard(self) -> None:
         QgsApplication.instance().clipboard().setPixmap(self.pixmap)
+
+
+class QChatGeojsonTreeWidgetItem(QChatTreeWidgetItem):
+    def __init__(self, parent: QTreeWidget, message: QChatGeojsonMessage):
+        super().__init__(parent, QTime.currentTime(), message.author, message.avatar)
+        self.message = message
+        self.init_time_and_author()
+        self.setText(MESSAGE_COLUMN, self.liked_message)
+
+        # set foreground color if sent by user
+        if message.author == self.settings.author_nickname:
+            self.set_foreground_color(self.settings.qchat_color_self)
+
+    def on_click(self, column: int) -> None:
+        if column == MESSAGE_COLUMN:
+            # save geojson to temp file
+            save_path = os.path.join(
+                tempfile.gettempdir(), f"{self.message.layer_name}.geojson"
+            )
+            with open(save_path, "w") as file:
+                json.dump(self.message.geojson, file)
+            # load geojson file into QGIS
+            layer = QgsVectorLayer(save_path, self.message.layer_name, "ogr")
+            layer.setCrs(QgsCoordinateReferenceSystem.fromWkt(self.message.crs_wkt))
+            QgsProject.instance().addMapLayer(layer)
+
+    @property
+    def liked_message(self) -> str:
+        layer_name = self.message.layer_name
+        nb_features = len(self.message.geojson["features"])
+        crs = self.message.crs_authid
+        return f"<'{layer_name}' layer: #{nb_features} features using CRS {crs}>"
+
+    @property
+    def can_be_copied_to_clipboard(self) -> bool:
+        return True
+
+    def copy_to_clipboard(self) -> None:
+        QgsApplication.instance().clipboard().setText(json.dumps(self.message.geojson))

qtribu/logic/qchat_messages.py

@@ -41,3 +41,13 @@ class QChatLikeMessage(QChatMessage):
     liker_author: str
     liked_author: str
     message: str
+
+
+@dataclass(init=True, frozen=True)
+class QChatGeojsonMessage(QChatMessage):
+    author: str
+    avatar: Optional[str]
+    layer_name: str
+    crs_wkt: str
+    crs_authid: str
+    geojson: dict

qtribu/logic/qchat_websocket.py

@@ -7,6 +7,7 @@
 
 from qtribu.logic.qchat_messages import (
     QChatExiterMessage,
+    QChatGeojsonMessage,
     QChatImageMessage,
     QChatLikeMessage,
     QChatMessage,
@@ -54,6 +55,7 @@ def __init__(self):
     newcomer_message_received = pyqtSignal(QChatNewcomerMessage)
     exiter_message_received = pyqtSignal(QChatExiterMessage)
     like_message_received = pyqtSignal(QChatLikeMessage)
+    geojson_message_received = pyqtSignal(QChatGeojsonMessage)
 
     def open(self, qchat_instance_uri: str, room: str) -> None:
         """
@@ -106,3 +108,5 @@ def on_message_received(self, text: str) -> None:
             self.exiter_message_received.emit(QChatExiterMessage(**message))
         elif msg_type == "like":
             self.like_message_received.emit(QChatLikeMessage(**message))
+        elif msg_type == "geojson":
+            self.geojson_message_received.emit(QChatGeojsonMessage(**message))