Support online web calendar (#805)

* Support online web calendar

* Refactor

* Update license info

core/Utils.vala

@@ -53,6 +53,10 @@ namespace Maya.Util {
             parent_source = registry.ref_source (parent_uid);
         }
 
+        if (source.parent == "webcal-stub") {
+            return _("On the web");
+        }
+
         return _("On this computer");
     }
 

plugins/Web/WebBackend.vala

@@ -0,0 +1,155 @@
+// -*- Mode: vala; indent-tabs-mode: nil; tab-width: 4 -*-
+/*
+ * Copyright 2024 elementary, Inc. (https://elementary.io)
+ * SPDX-License-Identifier: LGPL-2.0
+ */
+
+public Maya.Backend get_backend (Module module) {
+    debug ("Activating Web Backend");
+    var b = new Maya.WebBackend ();
+    b.ref ();
+    return b;
+}
+
+private static Maya.Backend backend;
+
+public class Maya.WebBackend : GLib.Object, Maya.Backend {
+
+    public WebBackend () {
+        backend = this;
+    }
+
+    public string get_name () {
+        return _("On the web");
+    }
+
+    public string get_uid () {
+        return "webcal-stub";
+    }
+
+    public Gee.Collection<PlacementWidget> get_new_calendar_widget (E.Source? to_edit = null) {
+        var collection = new Gee.LinkedList<PlacementWidget> ();
+
+        bool keep_copy = false;
+        if (to_edit != null) {
+            E.SourceOffline source_offline = (E.SourceOffline)to_edit.get_extension (E.SOURCE_EXTENSION_OFFLINE);
+            keep_copy = source_offline.stay_synchronized;
+        }
+
+        collection.add (Maya.DefaultPlacementWidgets.get_keep_copy (0, keep_copy));
+
+        var url_label = new PlacementWidget ();
+        url_label.widget = new Gtk.Label (_("URL:")) {
+            hexpand = true,
+            vexpand = true,
+            xalign = 1.0f
+        };
+        url_label.row = 1;
+        url_label.column = 0;
+        url_label.ref_name = "url_label";
+        collection.add (url_label);
+
+        var url_entry = new PlacementWidget ();
+        url_entry.widget = new Gtk.Entry () {
+            placeholder_text = "https://example.com"
+        };
+        url_entry.row = 1;
+        url_entry.column = 1;
+        url_entry.ref_name = "url_entry";
+        url_entry.needed = true;
+        collection.add (url_entry);
+        if (to_edit != null) {
+            E.SourceWebdav webdav = (E.SourceWebdav)to_edit.get_extension (E.SOURCE_EXTENSION_WEBDAV_BACKEND);
+#if HAS_EDS_3_46
+            var uri = webdav.dup_uri ();
+#else
+            var uri = webdav.dup_soup_uri ();
+#endif
+            if (uri.get_port () != 80) {
+                ((Gtk.Entry)url_entry.widget).text = "%s://%s:%u%s".printf (uri.get_scheme (), uri.get_host (), uri.get_port (), uri.get_path ());
+            } else {
+                ((Gtk.Entry)url_entry.widget).text = "%s://%s%s".printf (uri.get_scheme (), uri.get_host (), uri.get_path ());
+            }
+        }
+
+        return collection;
+    }
+
+    public void add_new_calendar (string name, string color, bool set_default, Gee.Collection<PlacementWidget> widgets) {
+        try {
+            var new_source = new E.Source (null, null) {
+                display_name = name
+            };
+            new_source.parent = get_uid ();
+            E.SourceCalendar cal = (E.SourceCalendar)new_source.get_extension (E.SOURCE_EXTENSION_CALENDAR);
+            cal.color = color;
+            cal.backend_name = "webcal";
+            E.SourceWebdav webdav = (E.SourceWebdav)new_source.get_extension (E.SOURCE_EXTENSION_WEBDAV_BACKEND);
+            // This creates the extension which we need, but we don't need to do anything with it
+            new_source.get_extension (E.SOURCE_EXTENSION_AUTHENTICATION);
+            E.SourceOffline offline = (E.SourceOffline)new_source.get_extension (E.SOURCE_EXTENSION_OFFLINE);
+            foreach (var widget in widgets) {
+                switch (widget.ref_name) {
+                    case "url_entry":
+#if HAS_EDS_3_46
+                        webdav.uri = GLib.Uri.parse (((Gtk.Entry)widget.widget).text, GLib.UriFlags.NONE);
+#else
+                        webdav.soup_uri = new Soup.URI (((Gtk.Entry)widget.widget).text);
+#endif
+                        break;
+                    case "keep_copy":
+                        offline.set_stay_synchronized (((Gtk.CheckButton)widget.widget).active);
+                        break;
+                }
+            }
+
+            var calmodel = Calendar.EventStore.get_default ();
+            var registry = calmodel.registry;
+            var list = new List<E.Source> ();
+            list.append (new_source);
+            registry.create_sources_sync (list);
+            calmodel.add_source (new_source);
+            if (set_default) {
+                registry.default_calendar = new_source;
+            }
+
+        } catch (GLib.Error error) {
+            critical (error.message);
+        }
+    }
+
+    public void modify_calendar (string name, string color, bool set_default, Gee.Collection<PlacementWidget> widgets, E.Source source) {
+        try {
+            source.display_name = name;
+            E.SourceCalendar cal = (E.SourceCalendar)source.get_extension (E.SOURCE_EXTENSION_CALENDAR);
+            cal.color = color;
+            E.SourceWebdav webdav = (E.SourceWebdav)source.get_extension (E.SOURCE_EXTENSION_WEBDAV_BACKEND);
+            // This creates the extension which we need, but we don't need to do anything with it
+            source.get_extension (E.SOURCE_EXTENSION_AUTHENTICATION);
+            E.SourceOffline offline = (E.SourceOffline)source.get_extension (E.SOURCE_EXTENSION_OFFLINE);
+            foreach (var widget in widgets) {
+                switch (widget.ref_name) {
+                    case "url_entry":
+#if HAS_EDS_3_46
+                        webdav.uri = GLib.Uri.parse (((Gtk.Entry)widget.widget).text, GLib.UriFlags.NONE);
+#else
+                        webdav.soup_uri = new Soup.URI (((Gtk.Entry)widget.widget).text);
+#endif
+                        break;
+                    case "keep_copy":
+                        offline.set_stay_synchronized (((Gtk.CheckButton)widget.widget).active);
+                        break;
+                }
+            }
+
+            source.write.begin (null);
+            if (set_default) {
+                var registry = new E.SourceRegistry.sync (null);
+                registry.default_calendar = source;
+            }
+
+        } catch (GLib.Error error) {
+            critical (error.message);
+        }
+    }
+}

plugins/Web/meson.build

@@ -0,0 +1,7 @@
+shared_module(
+    'web',
+    'WebBackend.vala',
+    dependencies: core_dep,
+    install: true,
+    install_dir: join_paths(pluginsdir, 'Web')
+)

plugins/meson.build

@@ -1,2 +1,3 @@
 subdir('CalDAV')
 subdir('Google')
+subdir('Web')