[core] Add methods to handle QGIS service connections

pg_service_parser/core/service_connections.py

@@ -0,0 +1,47 @@
+from qgis.core import (
+    QgsAbstractDatabaseProviderConnection,
+    QgsDataSourceUri,
+    QgsProviderRegistry,
+)
+from qgis.gui import QgsGui
+from qgis.PyQt.QtCore import QSettings
+
+
+def get_connections(service: str) -> dict[str, QgsAbstractDatabaseProviderConnection]:
+    res = {}
+    provider = QgsProviderRegistry.instance().providerMetadata("postgres")
+    conns = provider.connections()
+    for key, pg_conn in conns.items():
+        if QgsDataSourceUri(pg_conn.uri()).service() == service:
+            res[key] = pg_conn
+
+    return res
+
+
+def create_connection(service: str, name: str) -> None:
+    config = {}
+    uri = f"service='{service}'"
+    provider = QgsProviderRegistry.instance().providerMetadata("postgres")
+    conn = provider.createConnection(uri, config)
+    provider.saveConnection(conn, name)
+    # conn.store(name)
+
+
+def remove_connection(conn_name: str) -> None:
+    provider = QgsProviderRegistry.instance().providerMetadata("postgres")
+    provider.deleteConnection(conn_name)
+
+
+def edit_connection(conn_name: str) -> None:
+    provider = QgsProviderRegistry.instance().providerMetadata("postgres")
+
+    if conn_name in provider.dbConnections():
+        pg = QgsGui.sourceSelectProviderRegistry().providerByName("postgres")
+        w = pg.createDataSourceWidget()
+
+        settings = QSettings()
+        settings.value("PostgreSQL/connections/selected")
+        settings.setValue("PostgreSQL/connections/selected", conn_name)
+
+        w.refresh()  # To reflect the newly selected connection
+        w.btnEdit_clicked()